CALIBRATION PROCEDURE
™
NI 4070/4072 6½-Digit FlexDMM
This document contains step-by-step instructions for writing an external
calibration procedure for the National Instruments PXI/PCI-4070 and
NI PXI-4072 digital multimeters (DMMs). Each of these
isolated digitizer. For more information on calibration, visit ni.com/
Calibration Procedures............................................................................ 6
Verification Limits.................................................................................. 58
DC Voltage ...................................................................................... 58
AC Voltage ...................................................................................... 59
DC Current....................................................................................... 62
AC Current....................................................................................... 62
Frequency......................................................................................... 63
Capacitance and Inductance............................................................. 63
Appendix A: Calibration Options ........................................................... 64
Where to Go for Support......................................................................... 68
The procedures in this document are described using C function calls.
You also can program in LabVIEW using the VIs that correspond to the
C function calls.
Documentation Requirements
In addition to this calibration document, you may find the following
references helpful in writing your calibration utility. All of these
documents are installed on your computer when you install NI-DMM.
To locate them, select Start»All Programs»National Instruments»
NI-DMM»Documentation.
•
•
NI Digital Multimeters Help
NI Digital Multimeters Getting Started Guide
NI recommends referring to the following document online at ni.com/
manualsto ensure that you are using the latest NI 4070/4072
specifications:
•
NI 4070/4072 Specifications
You may need the following documents, which are available at ni.com/
manuals, to perform the optional frequency verification procedure:
•
TB-2715 Terminal Block Installation Guide
About Your NI 6608 Device
•
Calibration Function Reference
For detailed information about the NI-DMM calibration functions used in
this procedure, refer to the LabVIEW Reference or the C/CVI/VB Reference
sections of the NI Digital Multimeters Help, located at Start»
All Programs»National Instruments»NI-DMM»Documentation.
Password
The default calibration password in NI-DMM is "NI".
© National Instruments Corporation
3
NI 4070/4072 Calibration Procedure
Calibration Interval
The accuracy requirements of your measurement application determine
how often you should calibrate the NI 4070/4072. NI recommends
performing a complete calibration at least once every two years. NI does
not guarantee the absolute accuracy of the NI 4070/4072 beyond this
two-year calibration interval. You can shorten the calibration interval based
on the demands of your application. Refer to Appendix A: Calibration
Options for more information.
Test Equipment
This section describes the required and optional equipment for calibration.
Required Test Equipment
Requirements for All NI 4070/4072 Devices
The following equipment is required for calibrating the NI 4070/4072:
•
Fluke 5700A multifunction calibrator calibrated within the last
90 days, or a Fluke 5720A multifunction calibrator calibrated within
the last year
•
•
Two sets of Fluke 5440 low thermal electromotive force (EMF) copper
cables
Pomona 5145 insulated double banana plug shorting bar (or another
means of creating a short with low thermal EMF (≤150 nV) across the
HI and LO input banana plug connectors on the NI 4070/4072)
•
•
Two Pomona B-4 banana-to-banana patch cords (cables) or similar
banana-to-banana cables with length not to exceed 4 in.
National Instruments PXI chassis and controller, or a personal
computer (PC) with an available slot for the NI 4070/4072
Additional Requirements for the NI 4072
The following equipment is required for calibrating the capacitance and
inductance modes of the NI 4072:
•
25 Ω, 125 Ω, 5 kΩ, and 100 kΩ resistors with thermal drift ≤5 ppm/°C
and tolerance ≤1%. The distance between the resistor leads and the
NI 4072 terminals should be ≤1 in.
•
Verification capacitors calibrated to at least four times the accuracy of
the NI 4072, with temperature coefficients ≤250 ppm/°C. The values
of the verification capacitors should cover the complete capacitance
range. NI suggests using traceable capacitor standards with values
≥10% of full range for all ranges, except the 300 pF range. For the
NI 4070/4072 Calibration Procedure
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300 pF range, a capacitor with values between 90–100% of full scale
should be used. NI suggests using the capacitance standards of the
SCA Series from IET Labs. This calibration procedure assumes the use
of 270 pF, 1 nF, 100 nF, 10 μF, and 1000 μF standards.
•
If you are using cables to connect the verification capacitors to the
NI 4072 banana plug connectors, NI recommends using Pasternack
PE3005 banana-to-banana coaxial cables with length ≤4 inches and
total capacitance ≤40 pF. Before performing the verification
procedure, you should know the total capacitance up to the end of the
banana connectors that plug into the NI 4072.
Optional Test Equipment
The following equipment is optional for calibrating the NI 4070/4072 and
is only used for frequency verification:
•
•
•
•
•
NI PXI-6608 timing and digital I/O module
National Instruments SH68-68-D1 shielded cable
National Instruments TB-2715 terminal block
Pomona MDP 4892 double banana plug with strain relief
Coaxial cable (for example, RG178)
Test Conditions
Follow these guidelines to optimize the connections and the environment
during calibration:
•
Ensure that the PXI chassis fan speed is set to HI (if calibrating the
NI PXI-4070/4072) and that the fan filters are clean.
•
•
Use PXI filler panels in all vacant slots to allow proper cooling.
Plug the PXI chassis or PC and the calibrator into the same power strip
to avoid ground loops.
•
Power on and warm up both the calibrator and the NI 4070/4072 for at
least 60 minutes before beginning this calibration procedure.
•
•
•
Maintain an ambient temperature of 23 1 °C.
Maintain an ambient relative humidity of less than 60%.
Allow the calibrator to settle fully before taking any measurements.
Consult the Fluke 5700A/5720A user documentation for instructions.
•
•
Allow the thermal EMF enough time to stabilize when you change
connections to the calibrator or the NI 4070/4072. The suggested time
periods are stated where necessary throughout this document.
Keep a shorting bar connected between the V GUARD and
GROUND binding posts of the calibrator at all times.
© National Instruments Corporation
5
NI 4070/4072 Calibration Procedure
•
Clean any oxidation from the banana plugs on the Fluke 5440 cables
before plugging them into the binding posts of the calibrator or the
banana plug connectors of the NI 4070/4072. Oxidation tarnishes the
copper banana plugs so that they appear dull rather than shiny and
leads to greater thermal EMF.
•
•
Keep the blue banana plugs on the Fluke 5440 cables connected to the
V GUARD binding post of the calibrator at all times.
Prevent the cables from moving or vibrating by taping or strapping
them to a nonvibrating surface. Movement or vibration causes
triboelectric effects that can result in measurement errors.
Calibration Procedures
The calibration process includes the following steps:
2. Verification Procedures—Verify the existing operation of the device.
This step confirms whether the device is operating within its specified
range prior to calibration. Figure 4 shows the procedural flow for
verification.
3. Adjustment Procedures—Submit the device to NI for a factory
calibration to adjust the calibration constants. Figure 5 shows the
procedural flow for adjustment.
device is operating within its specifications after adjustment.
These steps are described in more detail in the following sections.
Appendix A: Calibration Options for more information.
Initial Setup
Note This section is necessary for pre-adjustment verifications only. If you are performing
a post-adjustment verification, skip the setup and go directly to the Verifying DC Voltage
section.
To set up the test equipment, complete the following steps:
1. Remove all connections from the four input banana plug connectors on
the NI 4070/4072.
2. Verify that the calibrator has been calibrated within the time limits
specified in the Required Test Equipment section, and that DC zeros
calibration has been performed within the last 30 days. Consult the
NI 4070/4072 Calibration Procedure
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Fluke 5700A/5720A user documentation for instructions on
calibrating these devices.
Note Ensure that both the calibrator and the NI 4070/4072 (installed in a powered-on
PXI chassis or PC) are warmed up for at least 60 minutes before you begin this procedure.
3. Call niDMM_initwith the resource name of the device to create a
session.
Note You use this session in all subsequent function calls throughout the verification
procedures.
For more information on using niDMM_init, refer to the NI Digital
Multimeters Help.
4. Call niDMM_SelfCal. This step is optional if you have adjusted the
NI 4070/4072 within the last 24 hours and the temperature has
remained constant to within 1 °C of the calibration temperature (Tcal).
Verification Procedures
You can use the verification procedures described in this section for both
pre-adjustment and post-adjustment verification. The steps of each
verification procedure must be performed in the order listed; however, you
can omit entire sections (for example, the entire Verifying AC Current
section), if necessary.
The parameters Range, Resolution, and Sample Interval used in function
calls throughout this section have floating point values. For example, if
Range = 1, the floating point value is 1.0. The parameters Trigger Count,
Sample Count, Array Size, and ParamValue have integer values. Refer
to the NI Digital Multimeters Help for more information about parameter
values.
Note Many of the parameter values listed in this document are expressed in scientific
notation. Some programming languages do not support the direct entry of numbers in this
format. Be sure to properly enter these values with the appropriate number of zeros. For
example, enter the scientific notation number 10e–6 as 0.00001and the number 100e3 as
100000. If your programming language supports scientific notation, NI recommends that
you use this feature to minimize possible data entry errors.
© National Instruments Corporation
7
NI 4070/4072 Calibration Procedure
Verifying DC Voltage
To verify DC voltage of the NI 4070/4072, complete the following steps:
1. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors on the NI 4070/4072.
2. Wait one minute for the thermal EMF to stabilize.
3. Call niDMM_reset.
4. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 1
Resolution = 1e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
6. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
8. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
9. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 10
Resolution = 10e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
11. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
NI 4070/4072 Calibration Procedure
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niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
13. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
14. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 100
Resolution = 100e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
16. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
17. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 300
Resolution = 300e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
19. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
21. Reset the calibrator.
22. Fasten the connectors on one end of the Fluke 5440 cable to the
appropriate banana plug connectors of the NI 4070/4072, and fasten
the connectors on the other end of the cable to the appropriate
calibrator binding posts. Figure 1 shows the correct connections.
Table 1 lists the cable connections.
© National Instruments Corporation
9
NI 4070/4072 Calibration Procedure
1
2
6½-Digit FlexDMM
OUTPUT
VΩA
SENSE
VΩ
HI
INPUT
300V
MAX
V
3
HI
LO
HI
HI
W
LO
1A, 250V
MAX
AMPS
LO
HI
300V
MAX
SENSE
W 4W
AUX
CURRENT
GUARD
GROUND
LO
AUX
I/O
5V
MAX
CAT II
1
NI 4070/4072
2
Fluke 5700A/5720A Calibrator
3
Fluke 5440 Cable
Figure 1. Cable Connections for Voltage and 2-Wire Resistance
Table 1. Fluke 5440 Cable Connections
Banana Plug Connector
(NI 4070/4072)
Banana Plug Color
(Fluke 5440 Cable)
Binding Post Label
(Fluke 5700A/5720A Calibrator)
HI
LO
Red
OUTPUT HI
Black
Blue
OUTPUT LO
V GUARD
(No connection)
23. Wait two minutes for the thermal EMF to stabilize.
24. Generate 0 V on the calibrator.
25. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 0.1
Resolution = 100e–9
26. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
NI 4070/4072 Calibration Procedure
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27. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 10
Sample Trigger = NIDMM_VAL_IMMEDIATE
Sample Interval = –1
28. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 10
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points. Store
the result as the 100 mV >10 GΩ mode offset.
29. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
30. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 10
Sample Trigger = NIDMM_VAL_IMMEDIATE
SampleInterval = –1
31. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 10
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points. Store
the result as the 100 mV 10 MΩ mode offset.
32. Output 100 mV on the calibrator with the range locked to 2.2 V.
This range prevents a 50 Ω calibrator output resistance from creating
a voltage divider with the internal resistance of the NI 4070/4072.
33. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 0.1
Resolution = 100e–9
© National Instruments Corporation
11
NI 4070/4072 Calibration Procedure
34. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
35. Call niDMM_Read. Subtract the previously stored 100 mV >10 GΩ
mode offset from this measurement, and verify that the result falls
between the limits listed in Table 15.
36. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
37. Call niDMM_Read. Subtract the previously stored 100 mV 10 MΩ
mode offset from this measurement and verify that the result falls
between the limits listed in Table 15.
38. Output –100 mV on the calibrator with the range locked to 2.2 V.
This range prevents a 50 Ω calibrator output resistance from creating
a voltage divider with the internal resistance of the NI 4070/4072.
39. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
40. Call niDMM_Read. Subtract the previously stored 100 mV >10 GΩ
mode offset from this measurement, and verify that the result falls
between the limits listed in Table 15.
41. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
42. Call niDMM_Read. Subtract the previously stored 100 mV 10 MΩ
mode offset from this measurement and verify that the result falls
between the limits listed in Table 15.
43. Output 1 V on the calibrator.
44. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 1
Resolution = 1e–6
NI 4070/4072 Calibration Procedure
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niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
46. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
48. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
49. Output –1 V on the calibrator.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
51. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
53. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
54. Output 10 V on the calibrator.
55. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 10
Resolution = 10e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
57. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
© National Instruments Corporation
13
NI 4070/4072 Calibration Procedure
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
59. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
60. Output –10 V on the calibrator.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
62. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
Attribute_Value = NIDMM_VAL_10_MEGAOHM
64. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
65. Output 100 V on the calibrator.
Caution Avoid touching the connections when generating a high voltage from the
calibrator.
66. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 100
Resolution = 100e–6
niDMM_SetAttributeViReal64with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE
68. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
69. Output –100 V on the calibrator.
70. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
NI 4070/4072 Calibration Procedure
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71. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_VOLTS
Range = 300
Resolution = 300e–6
72. Call niDMM_Read. Before you apply the voltage, the DMM must be in
the 300 V range.
73. Output 300 V on the calibrator.
74. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
75. Output –300 V on the calibrator.
76. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 15.
77. Reset the calibrator for safety reasons.
•
If you want to continue verifying other modes, go to the Verifying AC
Voltage section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
Verifying AC Voltage
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable to the
appropriate banana plug connectors on the NI 4070/4072, and fasten
the connectors on the other end of the cable to the appropriate
calibrator binding posts. Figure 1 shows the correct connections.
Table 1 lists the cable connections.
3. Output 5 mV at 1 kHz on the calibrator.
4. Call niDMM_resetto reset the NI 4070/4072 to a known state.
© National Instruments Corporation
15
NI 4070/4072 Calibration Procedure
5. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_VOLTS
Range = 0.05
Resolution = 50e–9
6. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
7. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED
Range = 0.05
Resolution = 50e–9
8. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
9. Output 50 mV at 30 Hz on the calibrator.
10. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 0.05
Resolution = 50e–9
limits listed in Table 16.
12. Refer to Table 2 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
b. Call niDMM_ConfigureMeasurementwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 2 for the current iteration.
limits listed in Table 16.
d. Call niDMM_ConfigureMeasurementagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
e. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
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13. Repeat step 12 for each of the remaining iterations shown in Table 2.
Table 2. niDMM_ConfigureMeasurement Parameters
Calibrator Output
Amplitude Frequency
niDMM_ConfigureMeasurement Parameters
Iteration
Function
NIDMM_VAL_AC_VOLTS
Range
0.05
0.05
0.05
0.05
0.5
Resolution
50e–9
50e–9
50e–9
50e–9
500e–9
500e–9
50e–9
50e–9
50e–9
50e–9
50e–9
50e–9
50e–9
50e–9
1
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 Hz
50 Hz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
6
7
1 kHz
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
1 kHz
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
0.5
20 kHz
20 kHz
50 kHz
50 kHz
100 kHz
100 kHz
300 kHz
300 kHz
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
14. Output 500 mV at 30 Hz on the calibrator.
15. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 0.5
Resolution = 500e–9
limits listed in Table 16.
17. Refer to Table 3 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 3 for the current iteration.
b. Call niDMM_ConfigureMeasurementwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 3 for the current iteration.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
limits listed in Table 16.
d. Call niDMM_ConfigureMeasurementagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
e. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
Table 3. niDMM_ConfigureMeasurement Parameters
Calibrator Output
Amplitude Frequency
niDMM_ConfigureMeasurement Parameters
Iteration
Function
NIDMM_VAL_AC_VOLTS
Range
0.5
0.5
0.5
0.5
5
Resolution
500e–9
500e–9
500e–9
500e–9
5e–6
1
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
50 Hz
50 Hz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
6
7
1 kHz
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
1 kHz
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
20 kHz
20 kHz
50 kHz
50 kHz
100 kHz
100 kHz
300 kHz
300 kHz
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
500e–9
500e–9
500e–9
500e–9
500e–9
500e–9
500e–9
500e–9
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
18. Output 5 V at 30 Hz on the calibrator.
19. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED
Range = 5
Resolution = 5e–6
20. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
NI 4070/4072 Calibration Procedure
18
ni.com
21. Refer to Table 4 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
b. Call niDMM_ConfigureMeasurementwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 4 for the current iteration.
limits listed in Table 16.
d. Call niDMM_ConfigureMeasurementagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
e. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
Table 4. niDMM_ConfigureMeasurement Parameters
Calibrator Output
niDMM_ConfigureMeasurement Parameters
Iteration
Amplitude
5 V
Frequency
50 Hz
Function
NIDMM_VAL_AC_VOLTS
Range
5
Resolution
5e–6
1
5 V
50 Hz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
2
3
4
5
6
7
8
5 V
1 kHz
5
5e–6
5 V
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
5 V
1 kHz
50
50
300
300
5
50e–6
50e–6
300e–6
300e–6
5e–6
5 V
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5 V
1 kHz
5 V
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5 V
20 kHz
20 kHz
50 kHz
50 kHz
100 kHz
100 kHz
300 kHz
300 kHz
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
5 V
5
5e–6
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
5 V
5
5e–6
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e–6
5 V
5
5e–6
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
5
5e–6
22. Output 50 V at 30 Hz on the calibrator.
© National Instruments Corporation
19
NI 4070/4072 Calibration Procedure
23. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 50
Resolution = 50e–6
limits listed in Table 16.
25. Refer to Table 5 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
b. Call niDMM_ConfigureMeasurementwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 5 for the current iteration.
limits listed in Table 16.
d. Call niDMM_ConfigureMeasurementagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
e. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
Table 5. niDMM_ConfigureMeasurement Parameters
Calibrator Output
niDMM_ConfigureMeasurement Parameters
Function
NIDMM_VAL_AC_VOLTS
Iteration
Amplitude
50 V
Frequency
50 Hz
Range
50
50
50
50
50
50
50
50
50
50
50
50
Resolution
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
50e–6
1
50 V
50 Hz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
6
50 V
1 kHz
50 V
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50 V
20 kHz
20 kHz
50 kHz
50 kHz
100 kHz
100 kHz
300 kHz
300 kHz
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50 V
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50 V
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50 V
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NI 4070/4072 Calibration Procedure
20
ni.com
26. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED
Range = 300
Resolution = 300e–6
apply the voltage.
28. Output 219 V at 30 Hz on the calibrator.
limits listed in Table 16.
30. Refer to Table 6 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
b. Call niDMM_ConfigureMeasurementwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 6 for the current iteration.
limits listed in Table 16.
d. Call niDMM_ConfigureMeasurementagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
e. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 16.
Table 6. niDMM_ConfigureMeasurement Parameters
Calibrator Output
niDMM_ConfigureMeasurement Parameters
Iteration
Amplitude
219 V
219 V
219 V
219 V
219 V
219 V
219 V
219 V
70 V
Frequency
50 Hz
Function
NIDMM_VAL_AC_VOLTS
Range
300
300
300
300
300
300
300
300
300
300
Resolution
300e–6
300e–6
300e–6
300e–6
300e–6
300e–6
300e–6
300e–6
300e–6
300e–6
1
50 Hz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
1 kHz
1 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
20 kHz
20 kHz
50 kHz
50 kHz
300 kHz
300 kHz
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
70 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
© National Instruments Corporation
21
NI 4070/4072 Calibration Procedure
31. Reset the calibrator for safety reasons.
•
If you want to continue verifying other modes, go to the Verifying
4-Wire Resistance section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
Verifying 4-Wire Resistance
To verify the 4-wire resistance of the NI 4070/4072, complete the
following steps:
1. Reset the calibrator.
2. Fasten the connectors on one end of each Fluke 5440 cable to the
appropriate banana plug connectors on the NI 4070/4072. Fasten the
connectors on the other end of each Fluke 5440 cable to the appropriate
calibrator binding posts. Figure 2 shows the Fluke 5440 cables. Table 7
lists the cable connections.
1
2
6½-Digit FlexDMM
OUTPUT
VΩA
SENSE
VΩ
HI
INPUT
300V
MAX
V
HI
LO
HI
HI
W
LO
1A, 250V
MAX
AMPS
LO
HI
3
300V
MAX
SENSE
W 4W
AUX
CURRENT
GUARD
GROUND
LO
AUX
I/O
5V
MAX
CAT II
1
NI 4070/4072
2
Fluke 5700A/5720A Calibrator
3
Fluke 5440 Cables
Figure 2. Cable Connections for 4-Wire Resistance
NI 4070/4072 Calibration Procedure
22
ni.com
Table 7. Fluke 5440 Cable Connections
Fluke 5440
Cable Identification
Banana Plug Connector
(NI 4070/4072)
Banana Plug Color
(Fluke 5440 Cable)
Binding Post
(Fluke 5700A/5720A Calibrator)
First cable
HI
Red
OUTPUT HI
OUTPUT LO
V GUARD
SENSE HI
SENSE LO
V GUARD
LO
Black
Blue
Red
(No connection)
HI SENSE
Second cable
LO SENSE
Black
Blue
(No connection)
3. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440
4. Call niDMM_reset.
5. Refer to Table 8 for the appropriate calibrator output and function
parameter values as you complete the following steps:
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 8 for the current iteration. Make sure that the
Note After setting the calibrator output to 0 Ω in the seventh iteration, you do not need to
continually set the calibrator to 0 Ω for iterations 8 through 12.
b. Call niDMM_ConfigureMeasurementwith the parameters set
as shown in Table 8 for the current iteration.
OffsetCompOhms set to either
NIDMM_VAL_OFFSET_COMP_OHMS_ONor
NIDMM_VAL_OFFSET_COMP_OHMS_OFFaccording to Table 8 for
the current iteration.
d. Call niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 17. Tolerances are provided instead of
absolute limits because your calibrator will have different discrete
resistance values.
© National Instruments Corporation
23
NI 4070/4072 Calibration Procedure
6. Repeat step 5 for each of the remaining iterations listed in Table 8.
Table 8. niDMM_ConfigureMeasurement Parameters
niDMM_ConfigureMeasurement Parameters
Calibrator
Output
Iteration
Function
Range
10e6
1e6
Resolution
10
OffsetCompOhms
1
2
10 MΩ
1 MΩ
100 kΩ
10 kΩ
1 kΩ
100 Ω
0 Ω
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
NIDMM_VAL_4_WIRE_RES
OFF
OFF
OFF
ON
1
3
100e3
10e3
1e3
0.1
4
0.01
1e–3
100e–6
10
5
ON
6
100
ON
7
10e6
1e6
OFF
OFF
OFF
ON
8
0 Ω
1
9
0 Ω
100e3
10e3
1e3
0.1
10
11
12
0 Ω
0.01
1e–3
100e–6
0 Ω
ON
100
ON
•
If you want to continue verifying other modes, go to the Verifying
2-Wire Resistance section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
Verifying 2-Wire Resistance
To verify the 2-wire resistance of the NI 4070/4072, complete the
following steps:
1. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors on the NI 4070/4072.
2. Wait one minute for the thermal EMF to stabilize.
3. Call niDMM_reset.
NI 4070/4072 Calibration Procedure
24
ni.com
4. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 10e3
Resolution = 0.01
5. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.
6. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 18.
7. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 1e3
Resolution = 1e–3
8. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.
9. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 18.
10. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 100
Resolution = 100e–6
11. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.
12. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 18.
14. Reset the calibrator.
15. Fasten the connectors on one end of the Fluke 5440 cable to the
NI 4070/4072, and fasten the connectors on the other end of the cable
to the appropriate calibrator binding posts. Figure 1 shows the correct
connections. Table 1 lists the cable connections.
16. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440
cable was not previously used in this configuration.
17. Output 0 Ω on the calibrator with 2-wire compensation turned on
but with external sense turned off.
18. Call niDMM_resetto reset the NI 4070/4072 to a known state.
© National Instruments Corporation
25
NI 4070/4072 Calibration Procedure
19. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 100e6
Resolution = 100
20. Call niDMM_Readand store the result as the 100 MΩ range offset.
21. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 10e6
Resolution = 10
22. Call niDMM_Readand store the result as the 10 MΩ range offset.
23. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 1e6
Resolution = 1
24. Call niDMM_Readand store the result as the 1 MΩ range offset.
25. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 100e3
Resolution = 0.1
26. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 4
Sample Trigger = NIDMM_VAL_IMMEDIATE
Sample Interval = –1
27. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 4
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points.
Store the result as the 100 kΩ range offset.
NI 4070/4072 Calibration Procedure
26
ni.com
28. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 10e3
Resolution = 0.01
29. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 4
Sample Trigger = NIDMM_VAL_IMMEDIATE
Sample Interval = –1
30. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 4
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points.
Store the result as the 10 kΩ range offset.
31. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 1e3
Resolution = 1e–3
32. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 4
Sample Trigger = NIDMM_VAL_IMMEDIATE
Sample Interval = –1
33. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 4
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points.
Store the result as the 1 kΩ range offset.
34. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 100
Resolution = 100e–6
© National Instruments Corporation
27
NI 4070/4072 Calibration Procedure
35. Call niDMM_ConfigureMultiPointwith the following parameters:
•
•
•
•
Trigger Count = 1
Sample Count = 10
Sample Trigger = NIDMM_VAL_IMMEDIATE
Sample Interval = –1
36. Call niDMM_ReadMultiPointwith the following parameters:
•
•
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO
Array Size = 10
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points.
Store the result as the 100 Ω range offset.
37. Output 100 MΩ on the calibrator without external sense or 2-wire
compensation.
38. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 100e6
Resolution = 100
39. Call niDMM_Read. Subtract the previously stored 100 MΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
40. Output 10 MΩ on the calibrator without external sense or 2-wire
compensation.
41. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 10e6
Resolution = 10
42. Call niDMM_Read. Subtract the previously stored 10 MΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
43. Output 1 MΩ on the calibrator without external sense or 2-wire
compensation.
44. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 1e6
Resolution = 1
NI 4070/4072 Calibration Procedure
28
ni.com
45. Call niDMM_Read. Subtract the previously stored 1 MΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
46. Output 100 kΩ on the calibrator without external sense or 2-wire
compensation.
47. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 100e3
Resolution = 0.1
48. Call niDMM_Read. Subtract the previously stored 100 kΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
49. Output 10 kΩ on the calibrator with 2-wire compensation turned on
but with external sense turned off.
50. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 10e3
Resolution = 0.01
51. Call niDMM_Read. Subtract the previously stored 10 kΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
52. Output 1 kΩ on the calibrator with 2-wire compensation turned on
but with external sense turned off.
53. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Range = 1e3
Resolution = 1e–3
54. Call niDMM_Read. Subtract the previously stored 1 kΩ range offset
from this measurement. Verify that the result falls between the
tolerances listed in Table 18.
55. Output 100 Ω on the calibrator with 2-wire compensation turned on
but with external sense turned off.
56. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_2_WIRE_RES
Range = 100
Resolution = 100e–6
© National Instruments Corporation
29
NI 4070/4072 Calibration Procedure
57. Call niDMM_Read. Subtract the previously calculated 100 Ω range
tolerances listed in Table 18.
•
If you want to continue verifying other modes, go to the Verifying DC
Current section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
Verifying DC Current
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable to the
NI 4070/4072 HI SENSE and LO banana plug connectors, and connect
the connectors on the other end of the cable to the HI and LO calibrator
binding posts. Figure 3 shows the correct connections. Table 9 lists the
cable connections.
1
2
6½-Digit FlexDMM
OUTPUT
VΩA
SENSE
VΩ
HI
INPUT
300V
MAX
V
3
HI
LO
HI
HI
W
LO
1A, 250V
MAX
AMPS
LO
HI
300V
MAX
SENSE
W 4W
AUX
CURRENT
GUARD
GROUND
LO
AUX
I/O
5V
MAX
CAT II
1
NI 4070/4072
2
Fluke 5700A/5720A Calibrator
3
Fluke 5440 Cable
Figure 3. Cable Connections for Current
NI 4070/4072 Calibration Procedure
30
ni.com
Table 9. Fluke 5440 Cable Connections
Banana Plug Connector
(NI 4070/4072)
Banana Plug Color
(Fluke 5440 Cable)
Binding Post
(Fluke 5700A/5720A Calibrator)
HI SENSE
Red
OUTPUT HI
LO
Black
Blue
OUTPUT LO
V GUARD
(No connection)
3. Call niDMM_resetto reset the NI 4070/4072 to a known state.
4. Set the current output on the calibrator to NORM and output 0 A.
5. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 0.02
Resolution = 20e–9
6. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
7. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 0.2
Resolution = 200e–9
8. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
9. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 1
Resolution = 1e–6
10. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
11. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 0.02
Resolution = 20e–9
12. Call niDMM_Readto configure the NI 4070/4072 for a current mode
before applying current.
© National Instruments Corporation
31
NI 4070/4072 Calibration Procedure
13. Output 20 mA on the calibrator.
14. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
15. Output –20 mA on the calibrator.
16. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
17. Output 200 mA on the calibrator.
18. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 0.2
Resolution = 200e–9
19. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
20. Output –200 mA on the calibrator.
21. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
22. Output 1 A on the calibrator.
23. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 1
Resolution = 1e–6
24. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 19.
25. Output –1 A on the calibrator.
limits listed in Table 19.
•
If you want to continue verifying other modes, go to the Verifying AC
Current section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
NI 4070/4072 Calibration Procedure
32
ni.com
Verifying AC Current
To verify the AC current of the NI 4070/4072, complete the following
steps:
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable to the
NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten
the connectors on the other end of the cable to the HI and LO calibrator
binding posts. Figure 3 shows the correct connections. Table 9 lists the
cable connections.
3. Call niDMM_resetto reset the NI 4070/4072 to a known state.
4. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_CURRENT
Range = 0.01
Resolution = 10e–9
before applying current.
6. Output 1 mA at 1 kHz on the calibrator with the current output set
to NORM.
7. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 20.
8. Output 10 mA at 1 kHz on the calibrator.
9. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 20.
10. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_CURRENT
Range = 0.1
Resolution = 100e–9
11. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 20.
12. Output 100 mA at 1 kHz on the calibrator.
13. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 20.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
14. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_AC_CURRENT
Range = 1
Resolution = 1e–6
15. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 20.
16. Output 1 A at 1 kHz on the calibrator.
limits listed in Table 20.
•
If you want to continue verifying other modes, go to the Verifying
Frequency section.
•
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
•
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
Verifying Frequency
Notes The frequency of the NI 4070/4072 is not user adjustable. If this verification
procedure indicates that the frequency is out of specification, return the NI 4070/4072
to NI for repair.
This verification procedure is optional and requires additional test
equipment. If you do not want to verify frequency, select one of the
following options:
•
•
•
If you are calibrating an NI 4072 and want to continue verifying other
modes, go to the Verifying Capacitance and Inductance (NI 4072
Only) section.
If you do not want to verify other modes and are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
NI 4070/4072 Calibration Procedure
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To verify the frequency of the NI 4070/4072, complete the following steps:
1. Remove all connections from the NI 4070/4072.
Note Polarity is not important in steps 2, 3, and 5.
2. Connect one end of the coaxial cable to the Pomona 4892 double
banana plug.
3. Tighten the other end of the coaxial cable in the screw terminal
channels 5 and 39 of the TB-2715 terminal block.
4. Connect the TB-2715 with the coaxial cable attached to the NI 6608.
5. Plug the Pomona 4892 into the HI and LO terminals of the
NI 4070/4072.
6. Call niDMM_resetto reset the NI 4070/4072 to a known state.
7. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_FREQ
Range = 1
Resolution = 0
8. Call niDMM_ConfigureFrequencyVoltageRangewith
Voltage Range set to 5.
9. Call GPCTR_Controlwith the following parameters:
•
deviceNumber = the device number of the NI 6608, assigned by
Measurement & Automation Explorer (MAX)
•
•
gpctrNum = ND_COUNTER_0
action = ND_RESET
10. Call GPCTR_Set_Applicationwith the following parameters:
•
deviceNumber = the device number of the NI 6608, assigned
by MAX
•
•
gpctrNum = ND_COUNTER_0
application = ND_PULSE_TRAIN_GNR
11. Call GPCTR_Change_Parameterwith the following parameters:
•
deviceNumber = the device number of the NI 6608, assigned
by MAX
•
•
•
gpctrNum = ND_COUNTER_0
paramID = ND_COUNT_1
paramValue = 10e6
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
12. Call GPCTR_Change_Parameterwith the following parameters:
•
deviceNumber = the device number of the NI 6608, assigned
by MAX
•
•
•
gpctrNum = ND_COUNTER_0
paramID = ND_COUNT_2
paramValue = 10e6
13. Call GPCTR_Controlwith the following parameters:
•
by MAX
•
•
gpctrNum = ND_COUNTER_0
action = ND_PROGRAM
14. Call niDMM_Read. Verify that this measurement falls between the
limits listed in Table 21.
•
by MAX
•
•
16. Repeat steps 10 through 15 with the following modification: in
steps 11 and 12, change paramValue to 500when you call the
function GPCTR_Change_Parameter.
17. Repeat steps 10 through 15 with the following modification: in
You have completed verifying the frequency of the NI 4070/4072. Select
one of the following options:
•
•
•
If you are calibrating an NI 4072 and want to continue verifying other
modes, go to the Verifying Capacitance and Inductance (NI 4072
Only) section.
If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call niDMM_closeto close
the session.
NI 4070/4072 Calibration Procedure
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Verifying Capacitance and Inductance (NI 4072 Only)
This verification procedure only applies to the NI 4072 and requires
additional test equipment, as indicated in the Additional Requirements for
the NI 4072 section.
Note The NI 4072 inductance accuracy is theoretically verified if the capacitance
accuracy meets the specifications. If you have access to precision inductors, you can verify
the inductance measurements by comparing your results with the published accuracy
specifications.
NI suggests using traceable capacitor standards with low thermal drift. You
You can verify two ranges with the same verification capacitor as long as
its value is ≥10% of the higher capacitor range. For example, you can use a
1 nF verification capacitor to test both the 10 nF and 1 nF ranges.
After taking each measurement, verify that the measurement falls between
the tolerances listed in Table 22. Tolerances are provided instead of
absolute limits, because you can use capacitance verification values other
than the values suggested, or the calibrated value may differ slightly from
the nominal capacitance (for example, 272.43 pF instead of 270.00 pF).
The tolerances shown in Table 22 correspond to the NI 4072 accuracy
specifications.
The following verification procedure assumes the use of verification
capacitors with the following values: 270 pF, 1 nF, 100 nF, 10 μF, and
1000 μF.
The configuration of the cables and fixtures should be consistent
throughout each measurement. If you are using cables to connect the
verification capacitors to the NI 4072 banana plug connectors, minimize
noise by ensuring that the cables remain fixed and do not move during the
measurement.
Keep direct contact with the verification capacitors to a minimum so that
they are constantly kept at the ambient temperature. After connecting a
capacitor to the NI 4072 terminals, NI recommends waiting 30 seconds for
the capacitor temperature to stabilize.
Note You should know the total capacitance up to the banana connectors that plug into the
NI 4072 before performing the verification procedure.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
To verify the capacitance measurements of the NI 4072, complete the
following steps:
1. Disconnect any fixtures or cables from the NI 4072.
2. Call niDMM_resetto reset the NI 4070/4072 to a known state.
3. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_CAPACITANCE
Range = 300e-12
Resolution = 50e-15
4. Set the number of averages of the NI 4072 to 20by calling
niDMM_SetAttributeViInt32with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
Attribute_Value = 20
Note This measurement corresponds to a 0 pF capacitance.
5. Call niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
6. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors of the NI 4072.
7. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_INDUCTANCE
Range = 10e-6
Resolution = 1e-9
8. Set the number of averages of the NI 4072 to 40by calling
niDMM_SetAttributeViInt32with the following parameters:
•
•
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
Attribute_Value = 40
Note This measurement corresponds to a 0 μH inductance.
9. Call niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
10. Remove the shorting bar and plug the 270 pF verification capacitor
into the HI and LO banana plug connectors of the NI 4072. Remember
to wait 30 seconds for the temperature to stabilize before performing
the next step.
NI 4070/4072 Calibration Procedure
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11. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_CAPACITANCE
Range = 300e-12
Resolution = 50e-15
niDMM_SetAttributeViInt32with the following parameters:
•
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
Attribute_Value = 20
13. Call niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
Note If you use capacitance verification values that differ from the values listed in
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
14. Remove the 270 pF verification capacitor, and plug the 1 nF
verification capacitor into the HI and LO banana plug connectors of the
NI 4072.
15. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_CAPACITANCE
Range = 1e-9
Resolution = 100e-15
16. Set the number of averages of the NI 4072 to 20by calling
•
•
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
Attribute_Value = 20
Note If you use capacitance verification values that differ from the values listed in
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
17. Call niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
18. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
•
Function = NIDMM_VAL_CAPACITANCE
Range = 10e-9
Resolution = 1e-12
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
19. Set the number of averages of the NI 4072 to 20by calling
•
•
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
Attribute_Value = 20
Note If you use capacitance verification values that differ from the values listed in
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
21. Remove the verification capacitor, and plug into the HI and LO banana
plug connectors of the NI 4072 the next capacitor to be verified,
according to Table 10.
NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGEfor all verification
capacitors listed.
Note If you use capacitance verification values that differ from the values listed in
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
Table 10. niDMM_ConfigureMeasurement Parameters
niDMM Configure Measurement Parameters
Value of
Verification Capacitor
Range
100e-9
1e-6
Resolution
10e-12
100e-12
1e-9
Number of Averages
100 nF
20
20
20
3
10 uF
10e-6
100e-6
1e-3
10e-9
1000 uF
100e-9
1e-6
3
10e-3
3
NI 4072. Select one of the following options:
•
If you are performing a pre-adjustment verification, call
niDMM_closeto close the session.
•
If you are performing a post-adjustment verification, go to the
Completing the Adjustment Procedures section.
NI 4070/4072 Calibration Procedure
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Adjustment Procedures
This section explains how to adjust the NI 4070/4072. You can choose to
perform these adjustment procedures with or without performing the
verification procedures first.
The parameters Range, Resolution, Expected Measurement, and
Frequency used in function calls in this section have floating point values.
For example, if Range = 1, the floating point value is 1.0. Refer to the
NI Digital Multimeters Help for more information about parameter values.
Note NI recommends repeating the verification procedures after you perform these
adjustment procedures. Reverification ensures that the device you have calibrated is
operating within specifications after adjustments.
Caution If you skip any of the steps within a section of the adjustment procedures,
NI-DMM does not allow you to store your new calibration coefficients. Instead, NI-DMM
restores the original coefficients to the EEPROM.
Setting Up the Test Equipment
steps:
1. Remove all connections from the four input banana plug connectors on
the NI 4070/4072.
2. Verify that the calibrator has been calibrated within the time limits
specified in the Required Test Equipment section, and that DC zeros
calibration has been performed within the last 30 days. Consult the
Fluke 5700A/5720A user documentation for instructions on
calibrating these devices.
Note Ensure that the calibrator is warmed up for at least 60 minutes before you begin this
procedure.
3. Reset the calibrator.
4. If you have not already done so, allow the NI 4070/4072 to warm up
for 60 minutes within a powered-on PXI chassis or PC.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
Adjusting DC Voltage and Resistance
following steps:
1. Fasten the connectors on one end of the Fluke 5440 cable to the
appropriate banana plug connectors on the NI 4070/4072, and fasten
the connectors on the other end of the cable to the appropriate
calibrator binding posts. Figure 1 shows the correct connections.
Table 1 lists the cable connections.
2. Wait two minutes for the thermal EMF to stabilize if the cable was not
previously connected in this configuration.
3. Call niDMM_InitExtCalwith the resource descriptor of the
NI 4070/4072 and your valid user password to output a calibration
session (Cal Session) that you can use to perform NI-DMM
calibration or regular measurement functions.
Note You will use Cal Session in all subsequent function calls.
Note The default user password for adjusting the NI 4070/4072 is NI. Use
niDMM_SetCalPasswordto change the password.
4. Call niDMM_ConfigurePowerLineFrequencywith PowerLine
Frequency set to 50or 60, depending on the power line frequency
(in hertz) that your instruments are powered from; select 50for
400 Hz power line frequencies.
5. Output 100 mV on the calibrator with the range locked to 2.2 V.
6. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 0.1
Input Resistance = NIDMM_VAL_10_MEGAOHM
Expected Measurement = 0.1
7. Output –100 mV on the calibrator.
8. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 0.1
Input Resistance = NIDMM_VAL_10_MEGAOHM
Expected Measurement = –0.1
9. Output 10 V on the calibrator.
NI 4070/4072 Calibration Procedure
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10. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 10
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
Expected Measurement = 10
11. Output –10 V on the calibrator.
12. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 10
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
Expected Measurement = –10
13. Disconnect the Fluke 5440 cable from the NI 4070/4072 banana plug
connectors, leaving the other end of the cable connected to the
calibrator binding posts.
14. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors of the NI 4070/4072.
15. Wait two minutes for the thermal EMF to stabilize.
16. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 10
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM
17. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_VREF.
18. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_DC_VOLTS
Range = 0.1
Input Resistance = NIDMM_VAL_10_MEGAOHM
19. Remove the shorting bar, and plug the Fluke 5440 cable back into the
NI 4070/4072 banana plug connectors, as shown in Figure 1.
20. Wait one minute for the thermal EMF to stabilize.
21. Output 10 MΩ from the calibrator without external sense.
22. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 10e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 10 MΩ
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
23. Output 0 Ω from the calibrator without external sense or 2-wire
compensation.
24. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 10e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 0 Ω
25. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 10e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
26. Disconnect the Fluke 5440 cable from the NI 4070/4072.
27. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_ZINT.
28. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_2WIRELEAKAGE.
29. On the NI 4070/4072, plug a Pomona B-4 banana cable from the HI
input to the HI SENSE input. Plug another Pomona B-4 banana cable
from the LO input to the LO SENSE input.
Caution Make sure that the insulation of these cables does not touch.
30. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_4WIRELEAKAGE.
31. Remove the banana cables, and plug the two sets of Fluke 5440 cables
into the appropriate banana plug connectors on the NI 4070/4072,
as shown in Figure 2 for 4-wire resistance.
32. Wait two minutes for the thermal EMF to stabilize.
33. Output 100 MΩ from the calibrator without external sense.
34. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 100e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 100 MΩ
35. Output 0 Ω from the calibrator without external sense or 2-wire
compensation.
NI 4070/4072 Calibration Procedure
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36. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 100e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 0 Ω
37. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 100e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
38. Output 100 kΩ on the calibrator with external sense turned on
but without 2-wire compensation.
39. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 100e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 100 kΩ
40. Output 0 Ω on the calibrator with external sense turned on but without
2-wire compensation.
41. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 100e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 0 Ω
42. Output 10 kΩ on the calibrator with external sense turned on
but without 2-wire compensation.
43. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 10e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = the display on the calibrator for 10 kΩ
44. Output 0 Ω on the calibrator with external sense turned on but without
2-wire compensation.
45. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 100e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
46. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 10e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
47. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCAL_RREF.
48. Call niDMM_SelfCalto self-calibrate the NI 4070/4072.
49. Output 0 Ω on the calibrator with external sense turned on but with
2-wire compensation turned off.
50. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 10e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
51. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 1e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
52. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 1e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
53. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_4_WIRE_RES
Range = 100
Input Resistance = NIDMM_VAL_RESISTANCE_NA
54. Remove the Fluke 5440 cables from the NI 4070/4072, leaving the
other end of the cables connected to the calibrator.
55. Plug in the insulated shorting bar across the HI and LO banana plug
connectors of the NI 4070/4072.
56. Wait two minutes for the thermal EMF to stabilize.
57. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 10e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
NI 4070/4072 Calibration Procedure
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58. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 1e6
Input Resistance = NIDMM_VAL_RESISTANCE_NA
59. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 100e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
60. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 10e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
61. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 1e3
Input Resistance = NIDMM_VAL_RESISTANCE_NA
62. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_2_WIRE_RES
Range = 100
Input Resistance = NIDMM_VAL_RESISTANCE_NA
63. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_SECTION.
NI 4070/4072. Select one of the following options:
•
If you are performing additional adjustments, refer to the following
sections, as applicable:
–
–
–
Adjusting AC Voltage (AC- and DC-Coupled) Modes
Adjusting Current Modes
Adjusting Capacitance and Inductance (NI 4072 Only)
Caution For the NI 4072, adjusting the capacitance and inductance is required. Skipping
this step causes an incorrect adjustment of the device.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
•
If you are not performing additional adjustments, refer to one of the
following sections:
–
Verification Procedures—to verify your new calibration
coefficients before saving them to the EEPROM
–
Completing the Adjustment Procedures—if you do not want to
Adjusting AC Voltage (AC- and DC-Coupled) Modes
Note If you do not use the AC voltage modes for any measurements, or the accuracy of
these modes is irrelevant, you can skip this section in the calibration procedure and go
directly to the Adjusting Current Modes section.
To adjust the AC voltage of the NI 4070/4072, complete the following
steps:
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable into the
appropriate banana plug connectors on the NI 4070/4072, and fasten
the connectors on the other end of the cable to the appropriate
Table 1 lists the cable connections.
3. Refer to Table 11 for the appropriate calibrator output and parameter
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 11 for the current iteration.
NIDMM_VAL_AC_VOLTS. Set the remaining parameters as shown
in Table 11 for the current iteration.
c. Call niDMM_CalAdjustGainagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
4. Repeat step 3 for each of the remaining iterations listed in Table 11.
Table 11. niDMM_CalAdjustGain Parameters
Calibrator Output
f
niDMM_CalAdjustGain Parameters
Range
Expected
Value
Iteration
Amplitude
(kHz)
Mode
(V)
0.05
0.05
0.5
Input Resistance
1
50 mV
1
1
1
1
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
0.05
0.05
0.5
50 mV
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
500 mV
500 mV
NIDMM_VAL_AC_VOLTS_DCCOUPLED
0.5
0.5
NI 4070/4072 Calibration Procedure
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Table 11. niDMM_CalAdjustGain Parameters (Continued)
Calibrator Output
niDMM_CalAdjustGain Parameters
f
Range
Expected
Value
Iteration
Amplitude
5 V
(kHz)
Mode
(V)
5
Input Resistance
3
1
1
1
1
1
1
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
5
5
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
4
5
50 V
50
50
300
300
50
50
100
100
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
100 V
100 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
the following steps:
a. Output 0 V on the calibrator.
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 12 for the current iteration.
c. Call niDMM_CalAdjustOffsetagain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
6. Repeat step 5 for each of the remaining iterations shown in Table 12.
Table 12. niDMM_CalAdjustOffset Parameters
niDMM_CalAdjustOffset Parameters
Iteration
Mode
Range (V)
0.05
0.05
0.5
0.5
5
Input Resistance (Ω)
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
NIDMM_VAL_1_MEGAOHM
1
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
50
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
300
300
NIDMM_VAL_AC_VOLTS_DCCOUPLED
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
7. Refer to Table 13 for the appropriate calibrator outputs and parameter
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 13 for the current iteration.
b. Call niDMM_CalAdjustACFilterwith Mode set to
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown
in Table 13 for the current iteration.
Note The Session parameter remains the same for all instances of this function.
c. Call niDMM_CalAdjustACFilteragain, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
8. Repeat step 7 for each of the remaining iterations shown in Table 13.
Table 13. niDMM_CalAdjustACFilter Parameters
Calibrator Output
niDMM_CalAdjustACFilter Parameters
Frequency
Range
(V)
Frequency
(Hz)
Iteration
Amplitude
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
500 mV
500 mV
(kHz)
1
Mode
1
NIDMM_VAL_AC_VOLTS
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.5
1e3
1e3
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
2
3
4
5
6
7
8
9
5
5e3
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5e3
20
20e3
20e3
50e3
50e3
100e3
100e3
200e3
200e3
300e3
300e3
500e3
500e3
1e3
20
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
100
100
200
200
300
300
500
500
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
0.5
1e3
NI 4070/4072 Calibration Procedure
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Table 13. niDMM_CalAdjustACFilter Parameters (Continued)
Calibrator Output
niDMM_CalAdjustACFilter Parameters
Frequency
(kHz)
Range
Frequency
(Hz)
Iteration
Amplitude
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
5 V
Mode
(V)
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
5
10
5
NIDMM_VAL_AC_VOLTS
5e3
5e3
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
11
12
13
14
15
16
17
18
19
20
21
22
23
20
20e3
20e3
50e3
50e3
100e3
100e3
200e3
200e3
300e3
300e3
500e3
500e3
1e3
20
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
100
100
200
200
300
300
500
500
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5 V
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
1e3
5 V
5
5
5e3
5 V
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5e3
5 V
20
5
20e3
20e3
50e3
50e3
100e3
100e3
200e3
200e3
300e3
300e3
5 V
20
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5 V
50
5
5 V
50
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5 V
100
100
200
200
300
300
5
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5 V
5
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
5 V
5
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
5
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
Table 13. niDMM_CalAdjustACFilter Parameters (Continued)
Calibrator Output
niDMM_CalAdjustACFilter Parameters
Frequency
(kHz)
Range
Frequency
(Hz)
Iteration
Amplitude
5 V
Mode
(V)
5
24
500
500
1
NIDMM_VAL_AC_VOLTS
500e3
500e3
1e3
5 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5
25
26
27
28
29
30
31
32
33
34
35
36
37
50 V
50
50 V
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
1e3
50 V
5
50
5e3
50 V
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
5e3
50 V
20
20
50
50
100
100
200
200
300
300
500
500
1
50
20e3
20e3
50e3
50e3
100e3
100e3
200e3
200e3
300e3
300e3
500e3
500e3
1e3
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50 V
50
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50 V
50
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50 V
50
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
50 V
50
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
10 V
50
10 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
50
100 V
100 V
100 V
100 V
100 V
100 V
100 V
100 V
100 V
100 V
300
300
300
300
300
300
300
300
300
300
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
1e3
5
5e3
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
5e3
20
20
50
50
100
100
20e3
20e3
50e3
50e3
100e3
100e3
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NI 4070/4072 Calibration Procedure
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Table 13. niDMM_CalAdjustACFilter Parameters (Continued)
Calibrator Output
niDMM_CalAdjustACFilter Parameters
Frequency
(kHz)
Range
(V)
Frequency
(Hz)
Iteration
Amplitude
100 V
100 V
50 V
Mode
38
200
200
300
300
500
500
NIDMM_VAL_AC_VOLTS
300
300
300
300
300
300
200e3
200e3
300e3
300e3
500e3
500e3
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
39
40
50 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
NIDMM_VAL_AC_VOLTS
10 V
10 V
NIDMM_VAL_AC_VOLTS_DCCOUPLED
9. Reset the calibrator for safety reasons.
10. Call niDMM_CalAdjustMiscwith Type set to
NIDMM_EXTCAL_MISCCAL_SECTION.
Select one of the following options:
•
If you are performing additional adjustments, refer to the following
sections, as applicable:
–
–
Adjusting Current Modes
Adjusting Capacitance and Inductance (NI 4072 Only)
this step causes an incorrect adjustment of the device.
•
If you are not performing additional adjustments, refer to one of the
following sections:
–
Verification Procedures—to verify your new calibration
coefficients before saving them to the EEPROM
–
Completing the Adjustment Procedures—if you do not want to
verify the adjustments you have just made
If you do not use the current modes (DC and AC), or the accuracy is
insignificant for your application, you can skip this section and select one
of the following options:
•
If you skip this section and you are calibrating an NI 4072, go to the
Adjusting Capacitance and Inductance (NI 4072 Only) section.
© National Instruments Corporation
53
NI 4070/4072 Calibration Procedure
•
•
If you skip this section and you want to verify the new calibration
coefficients before saving them to the EEPROM, repeat the
Verification Procedures section (except for Initial Setup).
If you skip this section and you do not want to verify the new
calibration coefficients, go to the Completing the Adjustment
Procedures section.
To adjust the current modes of the NI 4070/4072, complete the following
steps:
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable to the
NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten
the connectors on the other end of the cable to the HI and LO calibrator
binding posts. Figure 3 shows the correct connections. Table 9 lists the
cable connections.
3. Call niDMM_ConfigureMeasurementwith the following
parameters:
•
•
Function = NIDMM_VAL_DC_CURRENT
Range = 0.02
4. Call niDMM_Readto configure the NI 4070/4072 for a current mode
before applying current.
5. Output 20 mA on the calibrator with the current output set to NORM.
6. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.02
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = 0.02
7. Output –20 mA on the calibrator with the current output set to NORM.
8. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.02
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = –0.02
9. Output 0 A on the calibrator.
10. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.02
Input Resistance = NIDMM_VAL_RESISTANCE_NA
NI 4070/4072 Calibration Procedure
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11. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_AC_CURRENT
Range = 0.01
Input Resistance = NIDMM_VAL_RESISTANCE_NA
12. Output 200 mA on the calibrator.
13. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.2
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = 0.2
14. Output –200 mA on the calibrator.
15. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.2
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = –0.2
16. Output 0 A on the calibrator.
17. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 0.2
Input Resistance = NIDMM_VAL_RESISTANCE_NA
18. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_AC_CURRENT
Range = 0.1
Input Resistance = NIDMM_VAL_RESISTANCE_NA
19. Output 1 A on the calibrator.
20. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 1
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = 1
21. Output –1 A on the calibrator.
© National Instruments Corporation
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NI 4070/4072 Calibration Procedure
22. Call niDMM_CalAdjustGainwith the following parameters:
•
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 1
Input Resistance = NIDMM_VAL_RESISTANCE_NA
Expected Value = –1
23. Output 0 A on the calibrator with the current output set to NORM.
24. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_DC_CURRENT
Range = 1
Input Resistance = NIDMM_VAL_RESISTANCE_NA
25. Call niDMM_CalAdjustOffsetwith the following parameters:
•
•
•
Mode = NIDMM_VAL_AC_CURRENT
Range = 1
Input Resistance = NIDMM_VAL_RESISTANCE_NA
26. Call niDMM_CalAdjustMiscwith Type set to
You have completed adjusting the current modes of the NI 4070/4072.
Select one of the following options:
♦
If you are calibrating an NI 4070, refer to one of the following sections:
before saving them to the EEPROM
•
Completing the Adjustment Procedures—if you do not want to verify
the adjustments you have just made
♦
♦
If you are calibrating an NI 4072, refer to the Adjusting Capacitance and
Inductance (NI 4072 Only) section.
Adjusting Capacitance and Inductance
(NI 4072 Only)
If you are calibrating an NI 4070, skip this section and select one of the
•
•
If you want to verify the new calibration coefficients before saving
them to the EEPROM, repeat the Verification Procedures section
(except for the Initial Setup section).
If you do not want to verify the new calibration coefficients, go to the
Completing the Adjustment Procedures section.
NI 4070/4072 Calibration Procedure
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♦
If you are calibrating an NI 4072, you must complete this section to attain
a valid calibration.
Caution It is necessary to adjust DC voltage and resistance before running these
adjustment steps. During this procedure, be sure to keep hands and any other moving
objects away from the fixture after calling every function.
To adjust the capacitance and inductance of the NI 4072, complete the
following steps:
1. Disconnect any fixtures or cables from the NI 4072.
2. Call niDMM_CalAdjustLCwith Type set to
NIDMM_EXTCAL_LC_OPEN.
3. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors of the NI 4072.
4. Call niDMM_CalAdjustLCwith Type set to
NIDMM_EXTCAL_LC_SHORT.
5. Remove the shorting bar and plug the 25 Ω resistor across the HI and
LO banana plug connectors of the NI 4072. The leads between the
resistor and the NI 4072 terminals should be ≤1 in.
NIDMM_EXTCAL_LC_25OHM.
8. Remove the resistor, and plug in across the HI and LO banana plug
connectors of the NI 4072 the next adjustment resistor, according to
Table 14.
9. Repeat steps 6 through 8 using the parameters shown in Table 14 for
niDMM_CalAdjustLC.
Table 14. niDMM_CalAdjustLC Parameters
niDMM_CalAdjustLC Parameters
Value of Resistor
125 Ω
Type
NIDMM_EXTCAL_LC_1KOHM
NIDMM_EXTCAL_LC_5KOHM
5 kΩ
100 kΩ
You have completed adjusting the capacitance and inductance modes of the
NI 4072. Select one of the following options:
•
To verify that the NI 4072 is now operating within its specifications,
go to the Verification Procedures section and complete the appropriate
procedures.
© National Instruments Corporation
57
NI 4070/4072 Calibration Procedure
•
To finish the calibration and close the session, go to the Completing the
Adjustment Procedures section.
Completing the Adjustment Procedures
To complete the adjustment procedure for the NI 4070/4072 and close the
session, call niDMM_CloseExtCalwith the following parameter:
•
Action = NIDMM_EXTCAL_ACTION_SAVEif the results of the
calibration were satisfactory and you want to save the new calibration
coefficients to the EEPROM.
Otherwise,
•
Action = NIDMM_EXTCAL_ACTION_ABORTif the results of the
calibration were unsatisfactory and you want to restore the original
calibration coefficients to the EEPROM.
This section includes the verification limits for DC voltage, AC voltage,
4-wire resistance, 2-wire resistance, DC current, AC current, and frequency
for the NI 4070/4072, and the verification tolerances for capacitance on the
NI 4072. Compare these limits to the results you obtain in the Verification
Procedures section.
Note Use the values in the 24-Hour Limits column for a post-adjustment verification only.
Otherwise, use the values in the 2-Year Limits column.
Limits in the following tables are based upon the February 2007 edition of the
NI 4070/4072 Specifications. Refer to the most recent NI 4070/4072 specifications online
at ni.com/manuals. If a more recent edition of the specifications is available, recalculate
the limits based upon the latest specifications.
DC Voltage
Table 15. NI 4070/4072 DC Voltage Verification Limits
2-Year Limits
24-Hour Limits
Calibrator
Amplitude
Range
1 V
Input Resistance
>10 GΩ/10 MΩ
>10 GΩ/10 MΩ
10 MΩ
Lower
–6 μV
Upper
6 μV
Lower
Upper
2 μV
0 V
0 V
–2 μV
–20 μV
10 V
–60 μV
60 μV
20 μV
0 V
100 V
300 V
100 mV
–600 μV
–6 mV
600 μV
6 mV
–200 μV
–1.8 mV
0.099998 V
200 μV
1.8 mV
0.100002 V
0 V
10 MΩ
100 mV
>10 GΩ/10 MΩ
0.099994 V
0.100006 V
NI 4070/4072 Calibration Procedure
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Table 15. NI 4070/4072 DC Voltage Verification Limits (Continued)
2-Year Limits
24-Hour Limits
Calibrator
Amplitude
Range
100 mV
1 V
Input Resistance
>10 GΩ/10 MΩ
>10 GΩ/10 MΩ
>10 GΩ/10 MΩ
>10 GΩ/10 MΩ
>10 GΩ/10 MΩ
10 MΩ
Lower
Upper
Lower
Upper
–100 mV
1 V
–0.100006 V
0.999969 V
–1.000031 V
9.99969 V
–0.099994 V
1.000031 V
–0.999969 V
10.00031 V
–9.99969 V
100.0041 V
–99.9959 V
300.0165 V
–299.9835 V
–0.100002 V
0.999992 V
–1.000008 V
9.99994 V
–0.099998 V
1.000008 V
–0.999992 V
10.00006 V
–9.99994 V
100.0008 V
–99.9992 V
300.0036 V
–299.9964 V
–1 V
1 V
10 V
10 V
–10 V
100 V
–100 V
300 V
–300 V
10 V
–10.00031 V
99.9959 V
–10.00006 V
99.9992 V
100 V
100 V
300 V
300 V
10 MΩ
–100.0041 V
299.9835 V
–300.0165 V
–100.0008 V
299.9964 V
–300.0036 V
10 MΩ
10 MΩ
AC Voltage
Table 16. NI 4070/4072 AC Voltage Verification Limits
Calibrator Output
2-Year Limits
Amplitude
5 mV
Frequency
1 kHz
Range
50 mV
50 mV
50 mV
50 mV
500 mV
50 mV
50 mV
50 mV
50 mV
500 mV
500 mV
500 mV
5 V
Coupling
AC/DC
DC
Lower
Upper
0.0049775 V
0.04993 V
0.049955 V
0.049955 V
0.049875 V
0.049955 V
0.049935 V
0.04971 V
0.04845 V
0.49945 V
0.49965 V
0.49965 V
0.49875 V
0.49965 V
0.49945 V
0.0050225 V
0.05007 V
0.050045 V
0.050045 V
0.050125 V
0.050045 V
0.050065 V
0.05029 V
0.05155 V
0.50055 V
0.50035 V
0.50035 V
0.50125 V
0.50035 V
0.50055 V
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
50 mV
500 mV
500 mV
500 mV
500 mV
500 mV
500 mV
30 Hz
50 Hz
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
DC
1 kHz
1 kHz
20 kHz
50 kHz
100 kHz
300 kHz
30 Hz
50 Hz
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
1 kHz
1 kHz
20 kHz
50 kHz
500 mV
500 mV
© National Instruments Corporation
59
NI 4070/4072 Calibration Procedure
Table 16. NI 4070/4072 AC Voltage Verification Limits (Continued)
Calibrator Output
2-Year Limits
Amplitude
Frequency
100 kHz
300 kHz
30 Hz
Range
500 mV
500 mV
5 V
Coupling
AC/DC
AC/DC
DC
Lower
0.4974 V
0.48475 V
4.9945 V
4.9965 V
4.9965 V
4.9875 V
4.9375 V
4.9965 V
4.9945 V
4.974 V
Upper
500 mV
500 mV
5 V
0.5026 V
0.51525 V
5.0055 V
5.0035 V
5.0035 V
5.0125 V
5.0625 V
5.0035 V
5.0055 V
5.026 V
5 V
50 Hz
5 V
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
DC
5 V
1 kHz
5 V
5 V
1 kHz
50 V
300 V
5 V
5 V
1 kHz
5 V
20 kHz
50 kHz
100 kHz
300 kHz
30 Hz
5 V
5 V
5 V
5 V
5 V
5 V
4.8475 V
49.945 V
49.965 V
49.965 V
49.965 V
49.945 V
49.74 V
5.1525 V
50.055 V
50.035 V
50.035 V
50.035 V
50.055 V
50.26 V
50 V
50 V
50 V
50 V
50 V
50 V
50 V
219 V
219 V
219 V
219 V
219 V
219 V
70 V
50 V
50 V
50 V
50 V
50 V
50 V
50 V
300 V
300 V
300 V
300 V
300 V
300 V
300 V
50 Hz
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
DC
1 kHz
20 kHz
50 kHz
100 kHz
300 kHz
30 Hz
48.475 V
218.751 V
218.8305 V
218.8305 V
218.8305 V
218.7429 V
217.845 V
67.75 V
51.525 V
219.249 V
219.1695 V
219.1695 V
219.1695 V
219.2571 V
220.155 V
72.25 V
50 Hz
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
AC/DC
1 kHz
20 kHz
50 kHz
100 kHz
300 kHz
NI 4070/4072 Calibration Procedure
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4-Wire Resistance
Note Tolerances are provided for 4-wire resistance instead of absolute limits because the
limits depend on the actual resistance value output by your calibrator.
Table 17. NI 4070/4072 4-Wire Resistance Verification Tolerances
Calibrator
2-Year Tolerance
(ppm of Range)
24-Hour Tolerance
Resistance
10 MΩ
1 MΩ
100 kΩ
10 kΩ
1 kΩ
Range
10 MΩ
1 MΩ
100 kΩ
10 kΩ
1 kΩ
(ppm of Range)
102 ppm
22 ppm
17 ppm
14 ppm
14 ppm
25 ppm
2 ppm
410 ppm
100 ppm
86 ppm
83 ppm
83 ppm
90 ppm
10 ppm
10 ppm
6 ppm
100 Ω
0 Ω
100 Ω
10 MΩ
1 MΩ
100 kΩ
10 kΩ
1 kΩ
0 Ω
2 ppm
0 Ω
2 ppm
0 Ω
3 ppm
2 ppm
0 Ω
3 ppm
2 ppm
0 Ω
100 Ω
10 ppm
10 ppm
2-Wire Resistance
Note Tolerances are provided for 2-wire resistance instead of absolute limits because the
limits depend on the actual resistance value output by your calibrator.
Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances
Calibrator
Resistance
2-Year Tolerance
(ppm of Range)
24-Hour Tolerance
(ppm of Range)
Range
10 kΩ
1 kΩ
0 Ω
0 Ω
40 ppm
400 ppm
4000 ppm
6040 ppm
410 ppm
100 ppm
20 ppm
200 ppm
2000 ppm
920 ppm
102 ppm
22 ppm
0 Ω
100 Ω
100 MΩ
10 MΩ
1 MΩ
100 MΩ
10 MΩ
1 MΩ
© National Instruments Corporation
61
NI 4070/4072 Calibration Procedure
Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances (Continued)
Calibrator
Resistance
2-Year Tolerance
(ppm of Range)
24-Hour Tolerance
(ppm of Range)
Range
100 kΩ
10 kΩ
1 kΩ
100 kΩ
10 kΩ
1 kΩ
86 ppm
83 ppm
83 ppm
90 ppm
17 ppm
14 ppm
14 ppm
100 Ω
100 Ω
25 ppm
DC Current
Table 19. NI 4070/4072 DC Current Verification Limits
2-Year Limits
Calibrator Amplitude
Range
20 mA
200 mA
1 A
Lower
–1.5 μA
Upper
1.5 μA
0 A
0 A
–4 μA
4 μA
0 A
–20 μA
20 μA
20 mA
–20 mA
200 mA
–200 mA
1 A
20 mA
20 mA
200 mA
200 mA
1 A
19.989 mA
–20.011 mA
199.916 mA
–200.084 mA
0.99945 A
–1.00055 A
20.011 mA
–19.989 mA
200.084 mA
–199.916 mA
1.00055 A
–0.99945 A
–1 A
1 A
AC Current
Table 20. NI 4070/4072 AC Current Verification Limits
Calibrator Output
2-Year Limits
Amplitude
Frequency
1 kHz
Range
10 mA
10 mA
100 mA
100 mA
1 A
Lower
0.9976 mA
9.994 mA
9.976 mA
99.94 mA
99.7 mA
Upper
1 mA
10 mA
10 mA
100 mA
100 mA
1 A
1.0024 mA
10.006 mA
10.024 mA
100.06 mA
100.3 mA
1.0012 A
1 kHz
1 kHz
1 kHz
1 kHz
1 kHz
1 A
0.9988 A
NI 4070/4072 Calibration Procedure
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Frequency
Table 21. Frequency Limits
2-Year Limits
NI 6608 Output Frequency
Lower
Upper
1 Hz
0.9999 Hz
19.998 kHz
499.95 kHz
1.0001 Hz
20.002 kHz
500.05 kHz
20 kHz
500 kHz
Capacitance and Inductance
Note Because the actual capacitance verification values can differ from the following
values, Table 22 provides tolerances that correspond to the NI 4072 accuracy
specifications
Table 22. NI 4072 Capacitance and Inductance Verification Tolerances
2-Year Tolerances
Verification Values
0 pF
Range
300 pF
10 uH
% of Reading
% of Range
0
0.5
1
0 uH
0
270 pF
1 nF
300 pF
1 nF
0.15
0.15
0.15
0.15
0.18
0.18
0.18
0.18
0.18
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
1 nF
10 nF
100 nF
100 nF
10 uF
100 nF
1 uF
10 uF
10 uF
100 uF
1,000 uF
10,000 uF
1,000 uF
1,000 uF
© National Instruments Corporation
63
NI 4070/4072 Calibration Procedure
Appendix A: Calibration Options
The complete calibration process for the NI 4070/4072 consists of
verifying, adjusting, and reverifying a device. During verification, you
compare the measured performance to an external standard of known
specifications. Figure 4 shows the procedural flow for verification.
During adjustment, you correct the measurement error of the device by
adjusting the calibration constants and storing the new calibration constants
in the EEPROM. Frequency is the only mode that does not require
adjustment. Figure 5 shows the procedural flow for adjustment.
Reverifying all modes after adjustments ensures that the adjustment
procedures were performed correctly.
Normally, the calibration sequence is as follows:
1. Verify the operation of the NI 4070/4072 using the 2-year accuracy
limits (or the 90-day accuracy limits if it has been externally calibrated
within that time).
2. Adjust the NI 4070/4072.
3. Reverify the NI 4070/4072 using the 24-hour accuracy limits (or the
2-year accuracy limits when the 24-hour limits are not specified).
Depending on your measurement and accuracy requirements, a complete
calibration of the NI 4070/4072 may not be necessary. A number of options
are available that can shorten the calibration time. The following
adjustment options are available:
•
Complete calibration—Performing the entire calibration procedure
from beginning to end; guarantees that the NI 4070/4072 performs at
or above the published specifications for all modes and ranges
•
Complete calibration with exceptions:
–
–
–
Omitting AC voltage mode steps if you do not use the AC voltage
modes or if the AC voltage accuracy is irrelevant
Omitting DC/AC current mode steps if you do not use the current
modes or if the DC/AC current accuracy is irrelevant
Omitting both AC voltage and DC/AC current mode steps if you
do not use those modes or if the accuracy of those measurements
is irrelevant
NI 4070/4072 Calibration Procedure
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Table 23. Summary of Adjustment Options
Adjustment
Optional
Required
DC Voltage
Resistance
—
—
Y
Y
Y
AC Voltage
AC/DC Current
—
—
Y
Y
Inductance and Capacitance
(NI 4072 only)
—
© National Instruments Corporation
65
NI 4070/4072 Calibration Procedure
Verify
DC Voltage
Mode?
Go to
Initial Setup
Yes
Yes
Yes
Go to Verifying
DC Voltage
No
Verify
AC Voltage
Mode?
Go to Verifying
AC Voltage
No
Verify
4-Wire Resistance
Mode?
Go to Verifying
4-Wire Resistance
No
Verify
2-Wire Resistance
Mode?
Yes
Yes
Yes
Go to Verifying
2-Wire Resistance
No
Verify
DC Current
Mode?
Go to Verifying
DC Current
No
Verify
AC Current
Mode?
Go to Verifying
AC Current
No
Verify
Frequency
Mode?
Go to Verifying
Frequency
Yes
No
Go to Verifying
Capacitance
and Inductance
Verify Capacitance
and Inductance
(NI 4072 Only)?
Yes
No
Is this a
Go to Adjustment
Procedures
Flowchart
Go to Completing
the Adjustment
Procedures
Pre-Adjustment
Post-Adjustment
Pre-Adjustment or
Post-Adjustment
Verification?
Figure 4. Verification Procedures Flowchart
NI 4070/4072 Calibration Procedure
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ni.com
Verification
Go to Adjusting
DC Voltage and
Resistance
Adjust
AC Voltage
Modes?
No
Yes
Go to Adjusting
AC Voltage Modes
Adjust
Current
Modes?
No
Yes
Go to Adjusting
Current Modes
Go to Adjusting
Capacitance and
Inductance
Perform
Post-Adjustment
Verification?
Go to
Verification
Procedures Flowchart
Yes
No
Go to Completing
the Adjustment
Procedures
Figure 5. Adjustment Procedures Flowchart
© National Instruments Corporation
67
NI 4070/4072 Calibration Procedure
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