National Instruments NI 4070, NI4072 User Manual

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 National Instruments DMMs is a 6½-digit FlexDMM and 1.8 MS/s

isolated digitizer. For more information on calibration, visit

calibration

Conventions ............................................................................................2

Software Requirements ........................................................................... 2

Documentation Requirements................................................................. 3

Calibration Function Reference ....................................................... 3

Password ................................................................................................. 3

Calibration Interval ................................................................................. 4

Test Equipment ....................................................................................... 4

Required Test Equipment ................................................................ 4

Optional Test Equipment ................................................................. 5

Test Conditions ....................................................................................... 5

Calibration Procedures............................................................................ 6

Initial Setup......................................................................................6

Verification Procedures ................................................................... 7

Adjustment Procedures .................................................................... 41

Verification Limits.................................................................................. 58

DC Voltage ...................................................................................... 58

AC Voltage ...................................................................................... 59

4-Wire Resistance ............................................................................61

2-Wire Resistance ............................................................................61

DC Current.......................................................................................62

AC Current.......................................................................................62

Frequency......................................................................................... 63

Capacitance and Inductance............................................................. 63

Appendix A: Calibration Options ........................................................... 64

Where to Go for Support......................................................................... 68

ni.com/

™

Conventions

The following conventions are used in this document:

» The » symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box.

♦ The ♦ symbol indicates that the following text applies only to a specific

product, a specific operating system, or a specific software version.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to avoid injury, data loss, or a system crash. When this symbol is marked on a product, refer to the Read Me First: Safety and Radio-Frequency Interference document included with the device for information about precautions to take.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter names.

italic Italic text denotes variables, emphasis, a cross-reference, hardware labels,

or an introduction to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions.

Software Requirements

NI-DMM supports a number of programming languages including LabVIEW, LabWindows Visual Basic. When you install NI-DMM, you need to install support for only the language you intend to use to write your calibration utility.

Note NI-DMM version 2.1 or later supports NI PXI-4070 calibration, NI-DMM

version 2.2 or later supports NI PCI-4070 calibration, and NI-DMM version 2.3 or later supports NI 4072 calibration.

NI 4070/4072 Calibration Procedure 2 ni.com

™

/CVI™, Microsoft Visual C++, and Microsoft

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

manuals

specifications:

• NI 4070/4072 Specifications

You may need the following documents, which are available at

manuals

• TB-2715 Terminal Block Installation Guide

• About Your NI 6608 Device

to ensure that you are using the latest NI 4070/4072

, to perform the optional frequency verification procedure:

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".

ni.com/

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:

•25Ω, 125 Ω, 5kΩ, and 100 kΩ resistors with thermal drift ≤5ppm/°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 4 ni.com

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 270pF, 1nF, 100nF, 10μF, 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 VGUARD and GROUND binding posts of the calibrator at all times.

• 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:

1. Initial Setup—Set up the test equipment.

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.

4. Reverification—Repeat the verification procedure to ensure that the device is operating within its specifications after adjustment.

These steps are described in more detail in the following sections.

Note In some cases, the complete calibration procedure may not be required. Refer to

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 6 ni.com

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

Note You use this session in all subsequent function calls throughout the verification

procedures.

4. Call

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 = Sample Count, Array Size, and ParamValue have integer values. Refer

to the NI Digital Multimeters Help for more information about parameter values.

niDMM_init with the resource name of the device to create a

session.

For more information on using

niDMM_init, refer to the NI Digital

Multimeters Help.

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 (T

1, the floating point value is 1.0. The parameters Trigger Count,

cal

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

100000. If your programming language supports scientific notation, NI recommends that

0.00001 and the number 100e3 as

you use this feature to minimize possible data entry errors.

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

4. Call

5. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

6. Call

7. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

8. Call

9. Call

10. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

11. Call niDMM_Read. Verify that this measurement falls between the

niDMM_reset.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 1

• Resolution = 1e–6

niDMM_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_INPUT_RESISTANCE

• Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 15.

niDMM_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_INPUT_RESISTANCE

• Attribute_Value = NIDMM_VAL_10_MEGAOHM

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 15.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 10

• Resolution = 10e–6

niDMM_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_INPUT_RESISTANCE

• Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM

limits listed in Table 15.

NI 4070/4072 Calibration Procedure 8 ni.com

12. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 100

• Resolution = 100e–6

15. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 300

• Resolution = 300e–6

18. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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.

20. Remove the shorting bar from the NI 4070/4072.

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.

6½-Digit FlexDMM

OUTPUT

VΩA

AUX

CURRENT

AUX

I/O

5V MAX

300V MAX

1A, 250V

MAX

300V MAX

INPUT V

AMPS

SENSE

W 4W

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)

HI Red OUTPUT HI

LO Black OUTPUT LO

(No connection) Blue V GUARD

Banana Plug Color (Fluke 5440 Cable)

Binding Post Label

(Fluke 5700A/5720A Calibrator)

SENSE

VΩ

GUARD GROUND

23. Wait two minutes for the thermal EMF to stabilize.

24. Generate 0 V on the calibrator.

25. Call

niDMM_ConfigureMeasurement with 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_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_INPUT_RESISTANCE

• Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM

NI 4070/4072 Calibration Procedure 10 ni.com

27. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 10

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• Sample Interval = –1

28. Call niDMM_ReadMultiPoint with 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_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_INPUT_RESISTANCE

• Attribute_Value = NIDMM_VAL_10_MEGAOHM

30. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 10

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• SampleInterval = –1

31. Call niDMM_ReadMultiPoint with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 0.1

• Resolution = 100e–9

34. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

niDMM_SetAttributeViReal64 with the following parameters:

• 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

niDMM_SetAttributeViReal64 with the following parameters:

• 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

niDMM_SetAttributeViReal64 with the following parameters:

• 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

niDMM_SetAttributeViReal64 with the following parameters:

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 1

• Resolution = 1e–6

NI 4070/4072 Calibration Procedure 12 ni.com

45. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

niDMM_SetAttributeViReal64 with 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.

47. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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.

50. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

niDMM_SetAttributeViReal64 with 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.

52. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 10

• Resolution = 10e–6

56. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

niDMM_SetAttributeViReal64 with 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.

58. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with 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.

61. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling

niDMM_SetAttributeViReal64 with 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.

63. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

• Attribute_Value =

64. Call

niDMM_Read. Verify that this measurement falls between the

NIDMM_ATTR_INPUT_RESISTANCE

NIDMM_VAL_10_MEGAOHM

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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_VOLTS

• Range = 100

• Resolution = 100e–6

67. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling

niDMM_SetAttributeViReal64 with the following parameters:

• Attribute_ID =

• Attribute_Value =

NIDMM_ATTR_INPUT_RESISTANCE

NIDMM_VAL_10_MEGAOHM

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 14 ni.com

71. Call niDMM_ConfigureMeasurement with 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.

You have completed verifying the DC voltage of the NI 4070/4072. Select one of the following options:

• 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_close to close

the session.

Verifying AC Voltage

To verify 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 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_reset to reset the NI 4070/4072 to a known state.

5. Call niDMM_ConfigureMeasurement with 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_ConfigureMeasurement with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_VOLTS_DCCOUPLED

• Range = 0.05

• Resolution = 50e–9

11. Call niDMM_Read. Verify that this measurement falls between the limits listed in Table 16.

12. Refer to Table 2 for the appropriate calibrator outputs and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 2 for the current iteration.

b. Call

niDMM_ConfigureMeasurement with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 2 for the current iteration.

c. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

d. Call

niDMM_ConfigureMeasurement again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

e. Call niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

NI 4070/4072 Calibration Procedure 16 ni.com

13. Repeat step 12 for each of the remaining iterations shown in Table 2.

Table 2. niDMM_ConfigureMeasurement Parameters

Calibrator Output niDMM_ConfigureMeasurement Parameters

Iteration

1 50 mV 50 Hz NIDMM_VAL_AC_VOLTS 0.05 50e–9

2 50 mV 1kHz NIDMM_VAL_AC_VOLTS 0.05 50e–9

3 50 mV 1kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

4 50 mV 20 kHz NIDMM_VAL_AC_VOLTS 0.05 50e–9

5 50 mV 50 kHz NIDMM_VAL_AC_VOLTS 0.05 50e–9

6 50 mV 100 kHz NIDMM_VAL_AC_VOLTS 0.05 50e–9

7 50 mV 300 kHz NIDMM_VAL_AC_VOLTS 0.05 50e–9

Amplitude Frequency Function Range Resolution

50 mV 50 Hz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

50 mV 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

50 mV 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

50 mV 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

50 mV 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

50 mV 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

50 mV 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e–9

14. Output 500 mV at 30 Hz on the calibrator.

15. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_VOLTS_DCCOUPLED

• Range = 0.5

• Resolution = 500e–9

16. Call niDMM_Read. Verify that this measurement falls between the limits listed in Table 16.

17. Refer to Table 3 for the appropriate calibrator outputs and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 3 for the current iteration.

b. Call

niDMM_ConfigureMeasurement with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 3 for the current iteration.

c. Call niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

d. Call

e. Call

niDMM_ConfigureMeasurement again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

Table 3. niDMM_ConfigureMeasurement Parameters

Calibrator Output niDMM_ConfigureMeasurement Parameters

Iteration

Amplitude Frequency Function Range Resolution

1 500 mV 50 Hz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 50 Hz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

2 500 mV 1kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

3 500 mV 1kHz NIDMM_VAL_AC_VOLTS 5 5e–6

500 mV 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

4 500 mV 20 kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

5 500 mV 50 kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

6 500 mV 100 kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

7 500 mV 300 kHz NIDMM_VAL_AC_VOLTS 0.5 500e–9

500 mV 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e–9

18. Output 5 V at 30 Hz on the calibrator.

19. Call

niDMM_ConfigureMeasurement with 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 values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 4 for the current iteration.

b. Call

niDMM_ConfigureMeasurement with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 4 for the current iteration.

c. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

d. Call

e. Call

niDMM_ConfigureMeasurement again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

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

1 5V 50 Hz NIDMM_VAL_AC_VOLTS 5 5e–6

2 5V 1kHz NIDMM_VAL_AC_VOLTS 5 5e–6

3 5V 1kHz NIDMM_VAL_AC_VOLTS 50 50e–6

4 5V 1kHz NIDMM_VAL_AC_VOLTS 300 300e–6

5 5V 20 kHz NIDMM_VAL_AC_VOLTS 5 5e–6

6 5V 50 kHz NIDMM_VAL_AC_VOLTS 5 5e–6

7 5V 100 kHz NIDMM_VAL_AC_VOLTS 5 5e–6

8 5V 300 kHz NIDMM_VAL_AC_VOLTS 5 5e–6

Amplitude Frequency Function Range Resolution

5V 50 Hz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

5V 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

5V 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

5V 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

5V 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

5V 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

5V 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

5V 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e–6

22. Output 50 V at 30 Hz on the calibrator.

23. Call niDMM_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_AC_VOLTS_DCCOUPLED

• Range = 50

• Resolution = 50e–6

24. Call niDMM_Read. Verify that this measurement falls between the limits listed in Table 16.

25. Refer to Table 5 for the appropriate calibrator outputs and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 5 for the current iteration.

b. Call

niDMM_ConfigureMeasurement with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 5 for the current iteration.

c. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

d. Call

e. Call

niDMM_ConfigureMeasurement again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

Table 5. niDMM_ConfigureMeasurement Parameters

Calibrator Output niDMM_ConfigureMeasurement Parameters

Iteration

1 50 V 50 Hz NIDMM_VAL_AC_VOLTS 50 50e–6

2 50 V 1kHz NIDMM_VAL_AC_VOLTS 50 50e–6

3 50 V 20 kHz NIDMM_VAL_AC_VOLTS 50 50e–6

4 50 V 50 kHz NIDMM_VAL_AC_VOLTS 50 50e–6

5 50 V 100 kHz NIDMM_VAL_AC_VOLTS 50 50e–6

6 50 V 300 kHz NIDMM_VAL_AC_VOLTS 50 50e–6

NI 4070/4072 Calibration Procedure 20 ni.com

Amplitude Frequency Function Range Resolution

50 V 50 Hz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

50 V 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

50 V 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

50 V 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

50 V 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

50 V 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e–6

26. Call niDMM_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_AC_VOLTS_DCCOUPLED

• Range = 300

• Resolution = 300e–6

27. Call niDMM_Read. The DMM must be in the 300 V range before you apply the voltage.

28. Output 219 V at 30 Hz on the calibrator.

29. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

30. Refer to Table 6 for the appropriate calibrator outputs and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 6 for the current iteration.

b. Call

niDMM_ConfigureMeasurement with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 6 for the current iteration.

c. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 16.

d. Call

e. Call

niDMM_ConfigureMeasurement again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

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

1 219 V 50 Hz NIDMM_VAL_AC_VOLTS 300 300e–6

2 219 V 1kHz NIDMM_VAL_AC_VOLTS 300 300e–6

3 219 V 20 kHz NIDMM_VAL_AC_VOLTS 300 300e–6

4 219 V 50 kHz NIDMM_VAL_AC_VOLTS 300 300e–6

5 70 V 300 kHz NIDMM_VAL_AC_VOLTS 300 300e–6

Amplitude Frequency Function Range Resolution

219 V 50 Hz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

219 V 1kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

219 V 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

219 V 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

70 V 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e–6

31. Reset the calibrator for safety reasons.

You have completed verifying the AC voltage of the NI 4070/4072. Select one of the following options:

• 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_close to 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.

VΩA

AUX

SENSE

VΩ

GUARD GROUND

6½-Digit FlexDMM

OUTPUT

CURRENT

AUX

I/O

5V MAX

300V MAX

1A, 250V

MAX

300V MAX

INPUT V

AMPS

SENSE

W 4W

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

First cable HI Red OUTPUT HI

Second cable HI SENSE Red SENSE HI

Banana Plug Connector

(NI 4070/4072)

LO Black OUTPUT LO

(No connection) Blue V GUARD

LO SENSE Black SENSE LO

(No connection) Blue V GUARD

Banana Plug Color (Fluke 5440 Cable)

(Fluke 5700A/5720A Calibrator)

3. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440 cables were not previously connected in this configuration.

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 external sense is turned on but 2-wire compensation is turned off.

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.

Binding Post

b. Call

niDMM_ConfigureMeasurement with the parameters set

as shown in Table 8 for the current iteration.

c. Call

niDMM_ConfigureOffsetCompOhms with

OffsetCompOhms set to either

NIDMM_VAL_OFFSET_COMP_OHMS_ON or NIDMM_VAL_OFFSET_COMP_OHMS_OFF according 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.

6. Repeat step 5 for each of the remaining iterations listed in Table 8.

Table 8. niDMM_ConfigureMeasurement Parameters

Calibrator

Iteration

1 10 MΩ NIDMM_VAL_4_WIRE_RES 10e6 10 OFF

2 1MΩ NIDMM_VAL_4_WIRE_RES 1e6 1 OFF

3 100 kΩ NIDMM_VAL_4_WIRE_RES 100e3 0.1 OFF

4 10 kΩ NIDMM_VAL_4_WIRE_RES 10e3 0.01 ON

5 1kΩ NIDMM_VAL_4_WIRE_RES 1e3 1e–3 ON

6 100 Ω NIDMM_VAL_4_WIRE_RES 100 100e–6 ON

7 0 Ω NIDMM_VAL_4_WIRE_RES 10e6 10 OFF

8 0 Ω NIDMM_VAL_4_WIRE_RES 1e6 1 OFF

9 0 Ω NIDMM_VAL_4_WIRE_RES 100e3 0.1 OFF

10 0 Ω NIDMM_VAL_4_WIRE_RES 10e3 0.01 ON

11 0 Ω NIDMM_VAL_4_WIRE_RES 1e3 1e–3 ON

12 0 Ω NIDMM_VAL_4_WIRE_RES 100 100e–6 ON

Output

niDMM_ConfigureMeasurement Parameters

OffsetCompOhmsFunction Range Resolution

You have completed verifying the 4-wire resistance of the NI 4070/4072. Select one of the following options:

• 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_close to 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

NI 4070/4072 Calibration Procedure 24 ni.com

niDMM_reset.

4. Call niDMM_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 10e3

• Resolution = 0.01

5. Call niDMM_ConfigureOffsetCompOhms with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 1e3

• Resolution = 1e–3

8. Call niDMM_ConfigureOffsetCompOhms with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 100

• Resolution = 100e–6

11. Call niDMM_ConfigureOffsetCompOhms with 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.

13. Remove the shorting bar from the NI 4070/4072.

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_reset to reset the NI 4070/4072 to a known state.

19. Call niDMM_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 100e6

• Resolution = 100

20. Call niDMM_Read and store the result as the 100 MΩ range offset.

21. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 10e6

• Resolution = 10

22. Call niDMM_Read and store the result as the 10 MΩ range offset.

23. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 1e6

• Resolution = 1

24. Call niDMM_Read and store the result as the 1 MΩ range offset.

25. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 100e3

• Resolution = 0.1

26. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 4

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• Sample Interval = –1

27. Call niDMM_ReadMultiPoint with 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_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 10e3

• Resolution = 0.01

29. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 4

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• Sample Interval = –1

30. Call niDMM_ReadMultiPoint with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 1e3

• Resolution = 1e–3

32. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 4

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• Sample Interval = –1

33. Call niDMM_ReadMultiPoint with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 100

• Resolution = 100e–6

35. Call niDMM_ConfigureMultiPoint with the following parameters:

• Trigger Count =

• Sample Count = 10

• Sample Trigger = NIDMM_VAL_IMMEDIATE

• Sample Interval = –1

36. Call niDMM_ReadMultiPoint with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• 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_ConfigureMeasurement with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_2_WIRE_RES

• Range = 100

• Resolution = 100e–6

57. Call niDMM_Read. Subtract the previously calculated 100 Ω range offset from this measurement. Verify that the result falls between the tolerances listed in Table 18.

You have completed verifying the 2-wire resistance of the NI 4070/4072. Select one of the following options:

• 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_close to close

the session.

Verifying DC Current

To verify the DC 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 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.

VΩA

AUX

SENSE

VΩ

GUARD GROUND

6½-Digit FlexDMM

OUTPUT

CURRENT

AUX

I/O

5V MAX

300V MAX

1A, 250V

MAX

300V MAX

INPUT V

AMPS

SENSE

W 4W

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)

HI SENSE Red OUTPUT HI

LO Black OUTPUT LO

(No connection) Blue V GUARD

Banana Plug Color (Fluke 5440 Cable)

(Fluke 5700A/5720A Calibrator)

3. Call niDMM_reset to 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_ConfigureMeasurement with 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_ConfigureMeasurement with 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_ConfigureMeasurement with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_CURRENT

• Range = 0.02

• Resolution = 20e–9

12. Call niDMM_Read to configure the NI 4070/4072 for a current mode before applying current.

Binding Post

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_ConfigureMeasurement with 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_ConfigureMeasurement with 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.

26. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 19.

You have completed verifying the DC current of the NI 4070/4072. Select one of the following options:

• 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_close to 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

4. Call

5. Call niDMM_Read to configure the NI 4070/4072 for a current mode

6. Output 1 mA at 1 kHz on the calibrator with the current output set

7. Call

8. Output 10 mA at 1 kHz on the calibrator.

9. Call

10. Call

11. Call niDMM_Read. Verify that this measurement falls between the

12. Output 100 mA at 1 kHz on the calibrator.

13. Call

niDMM_reset to reset the NI 4070/4072 to a known state.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_CURRENT

• Range = 0.01

• Resolution = 10e–9

before applying current.

NORM.

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_CURRENT

• Range = 0.1

• Resolution = 100e–9

limits listed in Table 20.

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

14. Call niDMM_ConfigureMeasurement with 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.

17. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

You have completed verifying the AC current of the NI 4070/4072. Select one of the following options:

• 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_close to 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 the session.

NI 4070/4072 Calibration Procedure 34 ni.com

niDMM_close to close

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

7. Call

niDMM_reset to reset the NI 4070/4072 to a known state.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_FREQ

• Range = 1

• Resolution = 0

8. Call niDMM_ConfigureFrequencyVoltageRange with Voltage Range set to

9. Call

GPCTR_Control with 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_Application with 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_Parameter with the following parameters:

• deviceNumber = the device number of the NI 6608, assigned

by MAX

• gpctrNum =

ND_COUNTER_0

• paramID = ND_COUNT_1

• paramValue = 10e6

12. Call GPCTR_Change_Parameter with 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_Control with the following parameters:

• deviceNumber = the device number of the NI 6608, assigned

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.

15. Call

GPCTR_Control with the following parameters:

• deviceNumber = the device number of the NI 6608, assigned

by MAX

• gpctrNum =

ND_COUNTER_0

• action = ND_RESET

16. Repeat steps 10 through 15 with the following modification: in steps 11 and 12, change paramValue to function

GPCTR_Change_Parameter.

500 when you call the

17. Repeat steps 10 through 15 with the following modification: in steps 11 and 12, change paramValue to

GPCTR_Change_Parameter.

20 when you call the function

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_close to close

the session.

NI 4070/4072 Calibration Procedure 36 ni.com

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 can use different verification capacitors to verify each capacitance range. 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.

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

3. Call

niDMM_reset to reset the NI 4070/4072 to a known state.

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_CAPACITANCE

• Range = 300e-12

• Resolution = 50e-15

4. Set the number of averages of the NI 4072 to 20 by calling

niDMM_SetAttributeViInt32 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE

• Attribute_Value = 20

This measurement corresponds to a 0 pF capacitance.

Note

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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_INDUCTANCE

• Range = 10e-6

• Resolution = 1e-9

8. Set the number of averages of the NI 4072 to 40 by calling

niDMM_SetAttributeViInt32 with 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 38 ni.com

11. Call niDMM_ConfigureMeasurement with the following parameters:

• Function =

NIDMM_VAL_CAPACITANCE

• Range = 300e-12

• Resolution = 50e-15

12. Set the number of averages of the NI 4072 to 20 by calling

niDMM_SetAttributeViInt32 with 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_CAPACITANCE

• Range = 1e-9

• Resolution = 100e-15

16. Set the number of averages of the NI 4072 to 20 by calling

niDMM_SetAttributeViInt32 with the following parameters:

• 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_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_CAPACITANCE

• Range = 10e-9

• Resolution = 1e-12

19. Set the number of averages of the NI 4072 to 20 by calling

niDMM_SetAttributeViInt32 with the following parameters:

• Attribute_ID =

NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE

• Attribute_Value = 20

Note

20. Call

niDMM_Read. Verify that this measurement falls between the

tolerances listed in Table 22.

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.

22. Repeat steps 18 through 21, using the parameters shown in Table 10 for

NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE for all verification

niDMM_ConfigureMeasurement and

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

Valu e of

Verification Capacitor

100 nF 100e-9 10e-12

10 uF 10e-6 1e-9 20

niDMM Configure Measurement Parameters

1e-6 100e-12 20

100e-6 10e-9 3

Number of AveragesRange Resolution

1000 uF 1e-3 100e-9 3

10e-3 1e-6 3

You have completed verifying the capacitance and inductance of the NI 4072. Select one of the following options:

• If you are performing a pre-adjustment verification, call

niDMM_close to close the session.

• If you are performing a post-adjustment verification, go to the

Completing the Adjustment Procedures section.

NI 4070/4072 Calibration Procedure 40 ni.com

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 = 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

If you have not already set up the test equipment, complete the following steps:

1. Remove all connections from the four input banana plug connectors on

2. Verify that the calibrator has been calibrated within the time limits

1, the floating point value is 1.0. Refer to the

the NI 4070/4072.

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.

Adjusting DC Voltage and Resistance

To adjust the DC voltage and resistance of the NI 4070/4072, complete the 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

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_SetCalPassword to change the password.

niDMM_InitExtCal with 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.

4. Call

niDMM_ConfigurePowerLineFrequency with PowerLine

Frequency set to

50 or 60, depending on the power line frequency

(in hertz) that your instruments are powered from; select

50 for

400 Hz power line frequencies.

5. Output 100 mV on the calibrator with the range locked to 2.2 V.

6. Call

niDMM_CalAdjustGain with 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_CalAdjustGain with 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 42 ni.com

10. Call niDMM_CalAdjustGain with 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_CalAdjustGain with 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_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_DC_VOLTS

• Range = 10

• Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM

17. Call niDMM_CalAdjustMisc with Type set to

NIDMM_EXTCAL_MISCCAL_VREF.

18. Call

niDMM_CalAdjustOffset with 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_CalAdjustGain with 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

23. Output 0 Ω from the calibrator without external sense or 2-wire compensation.

24. Call

niDMM_CalAdjustGain with 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_CalAdjustOffset with 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

28. Call

niDMM_CalAdjustMisc with Type set to

NIDMM_EXTCAL_MISCCAL_ZINT.

niDMM_CalAdjustMisc with 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_CalAdjustMisc with 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_CalAdjustGain with 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 44 ni.com

36. Call niDMM_CalAdjustGain with 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_CalAdjustOffset with 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_CalAdjustGain with 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_CalAdjustGain with 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_CalAdjustGain with 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_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_4_WIRE_RES

• Range = 100e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

46. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_4_WIRE_RES

• Range = 10e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

47. Call niDMM_CalAdjustMisc with Type set to

NIDMM_EXTCAL_MISCAL_RREF.

48. Call

niDMM_SelfCal to 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_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_4_WIRE_RES

• Range = 10e6

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

51. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_4_WIRE_RES

• Range = 1e6

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

52. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_4_WIRE_RES

• Range = 1e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

53. Call niDMM_CalAdjustOffset with 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_CalAdjustOffset with the following parameters:

• Mode = NIDMM_VAL_2_WIRE_RES

• Range = 10e6

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

NI 4070/4072 Calibration Procedure 46 ni.com

58. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_2_WIRE_RES

• Range = 1e6

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

59. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_2_WIRE_RES

• Range = 100e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

60. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_2_WIRE_RES

• Range = 10e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

61. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_2_WIRE_RES

• Range = 1e3

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

62. Call niDMM_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_2_WIRE_RES

• Range = 100

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

63. Call niDMM_CalAdjustMisc with Type set to

NIDMM_EXTCAL_MISCCAL_SECTION.

You have completed adjusting the DC voltage and resistance modes of the 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.

• 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

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 calibrator binding posts. Figure 1 shows the correct connections. Table 1 lists the cable connections.

3. Refer to Table 11 for the appropriate calibrator output and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 11 for the current iteration.

b. Call

c. Call

4. Repeat step 3 for each of the remaining iterations listed in Table 11.

niDMM_CalAdjustGain with Mode set to

NIDMM_VAL_AC_VOLTS. Set the remaining parameters as shown

in Table 11 for the current iteration.

niDMM_CalAdjustGain again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

Table 11. niDMM_CalAdjustGain Parameters

Calibrator Output niDMM_CalAdjustGain Parameters

Iteration

NI 4070/4072 Calibration Procedure 48 ni.com

Amplitude

1 50 mV 1 NIDMM_VAL_AC_VOLTS 0.05 NIDMM_VAL_1_MEGAOHM 0.05

50 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 NIDMM_VAL_1_MEGAOHM 0.05

2 500 mV 1 NIDMM_VAL_AC_VOLTS 0.5 NIDMM_VAL_1_MEGAOHM 0.5

500 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 NIDMM_VAL_1_MEGAOHM 0.5

(kHz)

Mode

Range

(V)

Input Resistance

Expected

Val ue

Table 11. niDMM_CalAdjustGain Parameters (Continued)

Calibrator Output niDMM_CalAdjustGain Parameters

Iteration

Amplitude

3 5V 1 NIDMM_VAL_AC_VOLTS 5 NIDMM_VAL_1_MEGAOHM 5

5V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 NIDMM_VAL_1_MEGAOHM 5

4 50 V 1 NIDMM_VAL_AC_VOLTS 50 NIDMM_VAL_1_MEGAOHM 50

50 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 NIDMM_VAL_1_MEGAOHM 50

5 100 V 1 NIDMM_VAL_AC_VOLTS 300 NIDMM_VAL_1_MEGAOHM 100

100 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 NIDMM_VAL_1_MEGAOHM 100

(kHz)

Mode

Range

(V)

Input Resistance

5. Refer to Table 12 for the appropriate parameter values as you complete the following steps:

a. Output 0 V on the calibrator.

b. Call

niDMM_CalAdjustOffset with Mode set to

NIDMM_VAL_AC_VOLTS and the remaining parameters as shown

in Table 12 for the current iteration.

c. Call

niDMM_CalAdjustOffset again, changing Mode to

NIDMM_VAL_AC_VOLTS_DCCOUPLED.

6. Repeat step 5 for each of the remaining iterations shown in Table 12.

Expected

Val ue

Table 12. niDMM_CalAdjustOffset Parameters

niDMM_CalAdjustOffset Parameters

Iteration

1 NIDMM_VAL_AC_VOLTS 0.05 NIDMM_VAL_1_MEGAOHM

NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 NIDMM_VAL_1_MEGAOHM

2 NIDMM_VAL_AC_VOLTS 0.5 NIDMM_VAL_1_MEGAOHM

NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 NIDMM_VAL_1_MEGAOHM

3 NIDMM_VAL_AC_VOLTS 5 NIDMM_VAL_1_MEGAOHM

NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 NIDMM_VAL_1_MEGAOHM

4 NIDMM_VAL_AC_VOLTS 50 NIDMM_VAL_1_MEGAOHM

NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 NIDMM_VAL_1_MEGAOHM

5 NIDMM_VAL_AC_VOLTS 300 NIDMM_VAL_1_MEGAOHM

NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 NIDMM_VAL_1_MEGAOHM

Mode Range (V) Input Resistance (Ω)

7. Refer to Table 13 for the appropriate calibrator outputs and parameter values as you complete the following steps:

a. On the calibrator, output the value listed in the Calibrator Output

column in Table 13 for the current iteration.

b. Call

niDMM_CalAdjustACFilter with Mode set to

NIDMM_VAL_AC_VOLTS and 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_CalAdjustACFilter again, 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

Iteration

1 50 mV 1 NIDMM_VAL_AC_VOLTS 0.05 1e3

2 50 mV 5 NIDMM_VAL_AC_VOLTS 0.05 5e3

3 50 mV 20 NIDMM_VAL_AC_VOLTS 0.05 20e3

4 50 mV 50 NIDMM_VAL_AC_VOLTS 0.05 50e3

5 50 mV 100 NIDMM_VAL_AC_VOLTS 0.05 100e3

6 50 mV 200 NIDMM_VAL_AC_VOLTS 0.05 200e3

7 50 mV 300 NIDMM_VAL_AC_VOLTS 0.05 300e3

Amplitude

50 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 1e3

50 mV 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 5e3

50 mV 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 20e3

50 mV 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50e3

50 mV 100 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 100e3

50 mV 200 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 200e3

Frequency

(kHz)

Mode

Range

(V)

Frequency

(Hz)

50 mV 300 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 300e3

8 50 mV 500 NIDMM_VAL_AC_VOLTS 0.05 500e3

50 mV 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 500e3

9 500 mV 1 NIDMM_VAL_AC_VOLTS 0.5 1e3

500 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 1e3

NI 4070/4072 Calibration Procedure 50 ni.com

Table 13. niDMM_CalAdjustACFilter Parameters (Continued)

Calibrator Output niDMM_CalAdjustACFilter Parameters

Iteration

Amplitude

Frequency

(kHz)

Mode

10 500 mV 5 NIDMM_VAL_AC_VOLTS 0.5 5e3

500 mV 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 5e3

11 500 mV 20 NIDMM_VAL_AC_VOLTS 0.5 20e3

500 mV 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 20e3

12 500 mV 50 NIDMM_VAL_AC_VOLTS 0.5 50e3

500 mV 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 50e3

13 500 mV 100 NIDMM_VAL_AC_VOLTS 0.5 100e3

500 mV 100 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 100e3

14 500 mV 200 NIDMM_VAL_AC_VOLTS 0.5 200e3

500 mV 200 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 200e3

15 500 mV 300 NIDMM_VAL_AC_VOLTS 0.5 300e3

500 mV 300 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 300e3

16 500 mV 500 NIDMM_VAL_AC_VOLTS 0.5 500e3

500 mV 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 500e3

Range

(V)

Frequency

(Hz)

17 5 V 1 NIDMM_VAL_AC_VOLTS 5 1e3

5 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 1e3

18 5 V 5 NIDMM_VAL_AC_VOLTS 5 5e3

5 V 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 5e3

19 5 V 20 NIDMM_VAL_AC_VOLTS 5 20e3

5 V 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 20e3

20 5 V 50 NIDMM_VAL_AC_VOLTS 5 50e3

5 V 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 50e3

21 5 V 100 NIDMM_VAL_AC_VOLTS 5 100e3

5 V 100 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 100e3

22 5 V 200 NIDMM_VAL_AC_VOLTS 5 200e3

5 V 200 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 200e3

23 5 V 300 NIDMM_VAL_AC_VOLTS 5 300e3

5 V 300 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 300e3

Table 13. niDMM_CalAdjustACFilter Parameters (Continued)

Calibrator Output niDMM_CalAdjustACFilter Parameters

Iteration

Amplitude

Frequency

(kHz)

Mode

24 5 V 500 NIDMM_VAL_AC_VOLTS 5 500e3

5 V 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 500e3

25 50 V 1 NIDMM_VAL_AC_VOLTS 50 1e3

50 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 1e3

26 50 V 5 NIDMM_VAL_AC_VOLTS 50 5e3

50 V 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 5e3

27 50 V 20 NIDMM_VAL_AC_VOLTS 50 20e3

50 V 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 20e3

28 50 V 50 NIDMM_VAL_AC_VOLTS 50 50e3

50 V 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 50e3

29 50 V 100 NIDMM_VAL_AC_VOLTS 50 100e3

50 V 100 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 100e3

30 50 V 200 NIDMM_VAL_AC_VOLTS 50 200e3

50 V 200 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 200e3

Range

(V)

Frequency

(Hz)

31 50 V 300 NIDMM_VAL_AC_VOLTS 50 300e3

50 V 300 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 300e3

32 10 V 500 NIDMM_VAL_AC_VOLTS 50 500e3

10 V 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 500e3

33 100 V 1 NIDMM_VAL_AC_VOLTS 300 1e3

100 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 1e3

34 100 V 5 NIDMM_VAL_AC_VOLTS 300 5e3

100 V 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 5e3

35 100 V 20 NIDMM_VAL_AC_VOLTS 300 20e3

100 V 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 20e3

36 100 V 50 NIDMM_VAL_AC_VOLTS 300 50e3

100 V 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 50e3

37 100 V 100 NIDMM_VAL_AC_VOLTS 300 100e3

100 V 100 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 100e3

NI 4070/4072 Calibration Procedure 52 ni.com

Table 13. niDMM_CalAdjustACFilter Parameters (Continued)

Calibrator Output niDMM_CalAdjustACFilter Parameters

Iteration

38 100 V 200 NIDMM_VAL_AC_VOLTS 300 200e3

39 50 V 300 NIDMM_VAL_AC_VOLTS 300 300e3

40 10 V 500 NIDMM_VAL_AC_VOLTS 300 500e3

Amplitude

100 V 200 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 200e3

50 V 300 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 300e3

10 V 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300 500e3

Frequency

(kHz)

Mode

Range

(V)

Frequency

9. Reset the calibrator for safety reasons.

10. Call

niDMM_CalAdjustMisc with Type set to

NIDMM_EXTCAL_MISCCAL_SECTION.

You have completed adjusting the AC voltage modes of the NI 4070/4072. 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)

(Hz)

Caution For the NI 4072, adjusting the capacitance and inductance is required. Skipping

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

Adjusting Current Modes

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.

• 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.

3. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_DC_CURRENT

• Range = 0.02

4. Call niDMM_Read to 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

6. Call

niDMM_CalAdjustGain with the following parameters:

• Mode =

NIDMM_VAL_DC_CURRENT

NORM.

• 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_CalAdjustGain with 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_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_DC_CURRENT

• Range = 0.02

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

NI 4070/4072 Calibration Procedure 54 ni.com

11. Call niDMM_CalAdjustOffset with 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_CalAdjustGain with 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_CalAdjustGain with 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_CalAdjustOffset with the following parameters:

• Mode =

NIDMM_VAL_DC_CURRENT

• Range = 0.2

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

18. Call niDMM_CalAdjustOffset with 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_CalAdjustGain with 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.

22. Call niDMM_CalAdjustGain with the following parameters:

• Mode =

• 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

25. Call niDMM_CalAdjustOffset with the following parameters:

26. Call niDMM_CalAdjustMisc with Type set to

You have completed adjusting the current modes of the NI 4070/4072. Select one of the following options:

niDMM_CalAdjustOffset with the following parameters:

• Mode =

• Range = 1

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

• Mode =

• Range = 1

• Input Resistance = NIDMM_VAL_RESISTANCE_NA

NIDMM_EXTCAL_MISCCAL_SECTION.

NIDMM_VAL_DC_CURRENT

NIDMM_VAL_AC_CURRENT

♦ If you are calibrating an NI 4070, 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 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

following options:

• 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 56 ni.com

♦ 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_CalAdjustLC with 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_CalAdjustLC with 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.

6. Wait 30 seconds for the thermal EMF to stabilize.

7. Call

niDMM_CalAdjustLC with Type set to

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 NIDMM_EXTCAL_LC_1KOHM

5kΩ NIDMM_EXTCAL_LC_5KOHM

100 kΩ NIDMM_EXTCAL_LC_100KOHM

Typ e

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.

• 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

• Action = calibration were satisfactory and you want to save the new calibration coefficients to the EEPROM.

Otherwise,

• Action = calibration were unsatisfactory and you want to restore the original calibration coefficients to the EEPROM.

Verification Limits

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.

niDMM_CloseExtCal with the following parameter:

NIDMM_EXTCAL_ACTION_SAVE if the results of the

NIDMM_EXTCAL_ACTION_ABORT if the results of the

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

ni.com/manuals. If a more recent edition of the specifications is available, recalculate

at the limits based upon the latest specifications.

DC Voltage

Table 15. NI 4070/4072 DC Voltage Verification Limits

Calibrator Amplitude

0V 1V >10 GΩ/10 MΩ –6 μV 6 μV –2 μV 2 μV

0V 10 V >10 GΩ/10 MΩ –60 μV 60 μV –20 μV 20 μV

0V 100 V 10 MΩ –600 μV 600 μV –200 μV 200 μV

0V 300 V 10 MΩ –6 mV 6mV –1.8 mV 1.8 mV

100 mV 100 mV >10 GΩ/10 MΩ 0.099994 V 0.100006 V 0.099998 V 0.100002 V

NI 4070/4072 Calibration Procedure 58 ni.com

Range Input Resistance

2-Year Limits 24-Hour Limits

Lower Upper Lower Upper

Table 15. NI 4070/4072 DC Voltage Verification Limits (Continued)

Calibrator Amplitude

–100 mV 100 mV >10 GΩ/10 MΩ –0.100006 V –0.099994 V –0.100002 V –0.099998 V

1V 1V >10 GΩ/10 MΩ 0.999969 V 1.000031 V 0.999992 V 1.000008 V

–1 V 1V >10 GΩ/10 MΩ –1.000031 V –0.999969 V –1.000008 V –0.999992 V

10 V 10 V >10 GΩ/10 MΩ 9.99969 V 10.00031 V 9.99994 V 10.00006 V

–10 V 10 V >10 GΩ/10 MΩ –10.00031 V –9.99969 V –10.00006 V –9.99994 V

100 V 100 V 10 MΩ 99.9959 V 100.0041 V 99.9992 V 100.0008 V

–100 V 100 V 10 MΩ –100.0041 V –99.9959 V –100.0008 V –99.9992 V

300 V 300 V 10 MΩ 299.9835 V 300.0165 V 299.9964 V 300.0036 V

–300 V 300 V 10 MΩ –300.0165 V –299.9835 V –300.0036 V –299.9964 V

Range Input Resistance

2-Year Limits 24-Hour Limits

Lower Upper Lower Upper

AC Voltage

Table 16. NI 4070/4072 AC Voltage Verification Limits

Calibrator Output

Amplitude Frequency Lower Upper

5mV 1kHz 50 mV AC/DC 0.0049775 V 0.0050225 V

50 mV 30 Hz 50 mV DC 0.04993 V 0.05007 V

50 mV 50 Hz 50 mV AC/DC 0.049955 V 0.050045 V

Range Coupling

2-Year Limits

50 mV 1kHz 50 mV AC/DC 0.049955 V 0.050045 V

50 mV 1kHz 500 mV AC/DC 0.049875 V 0.050125 V

50 mV 20 kHz 50 mV AC/DC 0.049955 V 0.050045 V

50 mV 50 kHz 50 mV AC/DC 0.049935 V 0.050065 V

50 mV 100 kHz 50 mV AC/DC 0.04971 V 0.05029 V

50 mV 300 kHz 50 mV AC/DC 0.04845 V 0.05155 V

500 mV 30 Hz 500 mV DC 0.49945 V 0.50055 V

500 mV 50 Hz 500 mV AC/DC 0.49965 V 0.50035 V

500 mV 1kHz 500 mV AC/ DC 0.49965 V 0.50035 V

500 mV 1kHz 5V AC/DC 0.49875 V 0.50125 V

500 mV 20 kHz 500 mV AC/DC 0.49965 V 0.50035 V

500 mV 50 kHz 500 mV AC/DC 0.49945 V 0.50055 V

Table 16. NI 4070/4072 AC Voltage Verification Limits (Continued)

Calibrator Output

Amplitude Frequency Lower Upper

500 mV 100 kHz 500 mV AC/DC 0.4974 V 0.5026 V

500 mV 300 kHz 500 mV AC/DC 0.48475 V 0.51525 V

5V 30 Hz 5V DC 4.9945 V 5.0055 V

5V 50 Hz 5V AC/DC 4.9965 V 5.0035 V

5V 1kHz 5V AC/DC 4.9965 V 5.0035 V

5V 1kHz 50 V AC/DC 4.9875 V 5.0125 V

5V 1kHz 300 V AC/D C 4.9375 V 5.0625 V

5V 20 kHz 5V AC/DC 4.9965 V 5.0035 V

5V 50 kHz 5V AC/DC 4.9945 V 5.0055 V

5V 100 kHz 5V AC/DC 4.974 V 5.026 V

5V 300 kHz 5V AC/DC 4.8475 V 5.1525 V

50 V 30 Hz 50 V DC 49.945 V 50.055 V

50 V 50 Hz 50 V AC/DC 49.965 V 50.035 V

50 V 1kHz 50 V AC/DC 49.965 V 50.035 V

50 V 20 kHz 50 V AC/DC 49.965 V 50.035 V

50 V 50 kHz 50 V AC/DC 49.945 V 50.055 V

50 V 100 kHz 50 V AC/DC 49.74 V 50.26 V

Range Coupling

2-Year Limits

50 V 300 kHz 50 V AC/DC 48.475 V 51.525 V

219 V 30 Hz 300 V DC 218.751 V 219.249 V

219 V 50 Hz 300 V AC/DC 218.8305 V 219.1695 V

219 V 1kHz 300 V AC/DC 218.8305 V 219.1695 V

219 V 20 kHz 300 V AC /DC 218.8305 V 219.1695 V

219 V 50 kHz 300 V AC /DC 218.7429 V 219.2571 V

219 V 100 kHz 300 V AC/ DC 217.845 V 220.155 V

70 V 300 kHz 300 V AC/DC 67.75 V 72.25 V

NI 4070/4072 Calibration Procedure 60 ni.com

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 Resistance

10 MΩ 10 MΩ ±410 ppm ±102 ppm

1MΩ 1MΩ ±100 ppm ±22 ppm

100 kΩ 100 kΩ ±86 ppm ±17 ppm

10 kΩ 10 kΩ ±83 ppm ±14 ppm

1kΩ 1kΩ ±83 ppm ±14 ppm

100 Ω 100 Ω ±90 ppm ±25 ppm

0 Ω 10 MΩ ±10 ppm ±2 ppm

0 Ω 1MΩ ±10 ppm ±2 ppm

0 Ω 100 kΩ ±6 ppm ±2 ppm

0 Ω 10 kΩ ±3 ppm ±2 ppm

0 Ω 1kΩ ±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.

Range

2-Year Tolerance

(ppm of Range)

24-Hour Tolerance

(ppm of Range)

Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances

Calibrator Resistance

0 Ω 10 kΩ ±40 ppm ±20 ppm

0 Ω 1kΩ ±400 ppm ±200 ppm

0 Ω 100 Ω ±4000 ppm ±2000 ppm

100 MΩ 100 MΩ ±6040 ppm ±920 ppm

10 MΩ 10 MΩ ±410 ppm ±102 ppm

1MΩ 1MΩ ±100 ppm ±22 ppm

Range

2-Year Tolerance

(ppm of Range)

24-Hour Tolerance

(ppm of Range)

Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances (Continued)

Calibrator Resistance

100 kΩ 100 kΩ ±86 ppm ±17 ppm

10 kΩ 10 kΩ ±83 ppm ±14 ppm

1kΩ 1kΩ ±83 ppm ±14 ppm

100 Ω 100 Ω ±90 ppm ±25 ppm

Range

DC Current

Table 19. NI 4070/4072 DC Current Verification Limits

Calibrator Amplitude Range

0A 20 mA –1.5 μA 1.5 μA

0A 200 mA –4 μA 4 μA

0A 1A –20 μA 20 μA

20 mA 20 mA 19.989 mA 20.011 mA

–20 mA 20 mA –20.011 mA –19.989 mA

200 mA 200 mA 199.916 mA 200.084 mA

–200 mA 200 mA –200.084 mA –199.916 mA

2-Year Tolerance

(ppm of Range)

24-Hour Tolerance

(ppm of Range)

2-Year Limits

Lower Upper

1A 1A 0.99945 A 1.00055 A

–1 A 1A –1.00055 A –0.99945 A

AC Current

Table 20. NI 4070/4072 AC Current Verification Limits

Calibrator Output

Amplitude Frequency Lower Upper

1mA 1kHz 10 mA 0.9976 mA 1.0024 mA

10 mA 1kHz 10 mA 9.994 mA 10.006 mA

10 mA 1kHz 100 mA 9.976 mA 10.024 mA

100 mA 1kHz 100 mA 99.94 mA 100.06 mA

100 mA 1kHz 1A 99.7 mA 100.3 mA

1A 1kHz 1A 0.9988 A 1.0012 A

NI 4070/4072 Calibration Procedure 62 ni.com

Range

2-Year Limits

Frequency

Table 21. Frequency Limits

2-Year Limits

NI 6608 Output Frequency

1Hz 0.9999 Hz 1.0001 Hz

20 kHz 19.998 kHz 20.002 kHz

500 kHz 499.95 kHz 500.05 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

Verification Values Range

0pF 300 pF 0 ±0.5

0uH 10 uH 0 ±1

270 pF 300 pF ±0.15 ±0.1

1nF 1nF ±0.15 ±0.1

1nF 10 nF ±0.15 ±0.1

100 nF 100 nF ±0.15 ±0.1

100 nF 1uF ±0.18 ±0.1

Lower Upper

2-Year Tolerances

% of Reading % of Range

10 uF 10 uF ±0.18 ±0.1

10 uF 100 uF ±0.18 ±0.1

1,000 uF 1,000 uF ±0.18 ±0.1

1,000 uF 10,000 uF ±0.18 ±0.1

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 measurement uncertainty to confirm that the product meets or exceeds 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 64 ni.com

Table 23. Summary of Adjustment Options

Adjustment Optional Required

DC Voltage — Y

Resistance — Y

AC Voltage Y —

AC/DC Current Y —

Inductance and Capacitance (NI 4072 only)

— Y

Go to

Initial Setup

Verify

DC Voltage

Mode?

Ye s

Go to Verifying

DC Voltage

Verify

AC Voltage

Mode?

Verify

4-Wire Resistance

Mode?

Verify

2-Wire Resistance

Mode?

Verify

DC Current

Mode?

Verify

AC Current

Mode?

Verify

Frequency

Mode?

Ye s

Go to Verifying

AC Voltage

Go to Verifying

4-Wire Resistance

Go to Verifying

2-Wire Resistance

Go to Verifying

DC Current

Go to Verifying

AC Current

Go to Verifying

Frequency

Ye s

Go to Verifying

Capacitance

and Inductance

Go to Completing

the Adjustment

Procedures

Go to Adjustment

Procedures

Flowchart

Verify Capacitance

and Inductance

(NI 4072 Only)?

Pre-Adjustment Post-Adjustment

Is this a

Pre-Adjustment or

Post-Adjustment

Verification?

Figure 4. Verification Procedures Flowchart

NI 4070/4072 Calibration Procedure 66 ni.com

Verification

Go to

Adjusting

DC Voltage and

Resistance

Adjust

AC Voltage

Modes?

Ye s

Go to

Adjusting

AC Voltage Modes

Adjust

Current

Modes?

Ye s

Go to

Adjusting

Current Modes

Go to

Adjusting

Capacitance and

Inductance

Perform

Post-Adjustment

Verification?

Ye s

Go to

Verification

Procedures Flowchart

Go to

Completing

the Adjustment

Procedures

Figure 5. Adjustment Procedures Flowchart

Where to Go for Support

The National Instruments Web site is your complete resource for technical support. At troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.

A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer’s declaration of conformity. This system affords the user protection for electronic compatibility (EMC) and product safety. You can obtain the DoC for your product by visiting supports calibration, you can obtain the calibration certificate for your product at

National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world to help address your support needs. For telephone support in the United States, create your service request at instructions or dial 512 795 8248. For telephone support outside the United States, contact your local branch office:

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370532F-01 Apr07

National Instruments NI 4070, NI4072 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Conventions

Software Requirements

Documentation Requirements

Calibration Function Reference

Password

Calibration Interval

Test Equipment

Required Test Equipment

Requirements for All NI 4070/4072 Devices

Additional Requirements for the NI 4072

Optional Test Equipment

Test Conditions

Calibration Procedures

Initial Setup

Verification Procedures

Verifying DC Voltage

Figure 1. Cable Connections for Voltage and 2-Wire Resistance

Table 1. Fluke 5440 Cable Connections

Verifying AC Voltage

Table 2. niDMM_ConfigureMeasurement Parameters

Table 3. niDMM_ConfigureMeasurement Parameters

Table 4. niDMM_ConfigureMeasurement Parameters

Table 5. niDMM_ConfigureMeasurement Parameters

Table 6. niDMM_ConfigureMeasurement Parameters

Verifying 4-Wire Resistance

Figure 2. Cable Connections for 4-Wire Resistance

Table 7. Fluke 5440 Cable Connections

Table 8. niDMM_ConfigureMeasurement Parameters

Verifying 2-Wire Resistance

Verifying DC Current

Figure 3. Cable Connections for Current

Table 9. Fluke 5440 Cable Connections

Verifying AC Current

Verifying Frequency

Verifying Capacitance and Inductance (NI 4072 Only)

Table 10. niDMM_ConfigureMeasurement Parameters

Adjustment Procedures

Setting Up the Test Equipment

Adjusting DC Voltage and Resistance

Adjusting AC Voltage (AC- and DC-Coupled) Modes

Table 11. niDMM_CalAdjustGain Parameters

Table 12. niDMM_CalAdjustOffset Parameters

Table 13. niDMM_CalAdjustACFilter Parameters

Adjusting Current Modes

Adjusting Capacitance and Inductance (NI 4072 Only)

Table 14. niDMM_CalAdjustLC Parameters

Completing the Adjustment Procedures

Verification Limits

DC Voltage

Table 15. NI 4070/4072 DC Voltage Verification Limits

AC Voltage

Table 16. NI 4070/4072 AC Voltage Verification Limits

4-Wire Resistance

Table 17. NI 4070/4072 4-Wire Resistance Verification Tolerances

2-Wire Resistance

Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances

DC Current

Table 19. NI 4070/4072 DC Current Verification Limits

AC Current

Table 20. NI 4070/4072 AC Current Verification Limits

Frequency

Table 21. Frequency Limits

Capacitance and Inductance

Table 22. NI 4072 Capacitance and Inductance Verification Tolerances

Appendix A: Calibration Options

Table 23. Summary of Adjustment Options

Figure 4. Verification Procedures Flowchart

Figure 5. Adjustment Procedures Flowchart

Where to Go for Support