National Instruments NI 4070/4072 6 1/2-Digit FlexDMM - page 38

NI 4070/4072 Calibration Procedure 38 ni.com

To verify the capacitance measurements of the NI4072 , complete the

following steps:

1. Disconnect any fixtures or cables from the NI4072.

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

3. Call niDMM_ConfigureMeasurement with the following

parameters:

•Function = NIDMM_VAL_CAPACITANCE

•Range = 300e-12

•Resolution = 50e-15

4. Set the number of averages of the NI4072 to 20 by calling

niDMM_SetAttributeViInt32 with the following parameters:

•Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE

•Attribute_Value = 20

Note This measurement corresponds to a 0 pF capacitance.

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

tolerances listed in Table22.

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 NI4072 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 Table22.

10. Remove the shorting bar and plug the 270pF 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.

Contents

Main CALIBRATION PROCEDURE NI 4070/4072 6-Digit FlexDMM 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 Page NI 4070/4072 Calibration Procedure 10 ni.com Figure 1. Cable Connections for Voltage and 2-Wire Resistance niDMM_SetAttributeViReal64 with the following parameters: Attribute_ID = Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 1 NI4070/4072 2 Fluke 5700A/5720A Calibrator 3 Fluke 5440 Cable Table 1. Fluke 5440 Cable Connections BananaPlug Connector (NI4070/4072) Banana Plug Color (Fluke 5440Cable) Page Page Page Page Verifying AC Voltage Page Page Page Page Page Page Verifying 4-Wire Resistance Page Verifying 2-Wire Resistance Page Page Page Page Page Verifying DC Current Page Page Verifying AC Current Verifying Frequency Page Page Verifying Capacitance and Inductance (NI 4072 Only) Page Page Page Adjustment Procedures Setting Up the Test Equipment Adjusting DC Voltage and Resistance Page Page Page Page Page Adjusting AC Voltage (AC- and DC-Coupled) Modes Page Page Page Table 13. niDMM_CalAdjustACFilter Parameters (Continued) Adjusting Current Modes Page Page Adjusting Capacitance and Inductance (NI 4072 Only) Page Completing the Adjustment Procedures Verification Limits DC Voltage AC Voltage Table 16. NI 4070/4072 AC Voltage Verification Limits Table 15. NI 4070/4072 DC Voltage Verification Limits (Continued) Table 16. NI 4070/4072 AC Voltage Verification Limits (Continued) 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. 2-Wire Resistance Note Tolerances are provided for 2-wire resistance instead of absolute limits because the DC Current AC Current Table 19. NI 4070/4072 DC Current Verification Limits Table 20. NI 4070/4072 AC Current Verification Limits Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances (Continued) Frequency Capacitance and Inductance Note Because the actual capacitance verification values can differ from the following values, Table22 provides tolerances that correspond to the NI 4072 accuracy specifications Table 21. Frequency Limits Appendix A: Calibration Options Page Figure 4. Verification Procedures Flowchart NI 4070/4072 Calibration Procedure 66 ni.com Figure 5. Adjustment Procedures Flowchart National Instruments Corporation 67 NI 4070/4072 Calibration Procedure Where to Go for Support