National Instruments 1/2-Digit User Manual download pdf (Page 33)

Verifying AC Current

To verify the AC current of the NI 4070/4072, complete the following

steps:

1. Reset the calibrator.

2. Fasten the connectors on one end of the Fluke 5440 cable to the

NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten

the connectors on the other end of the cable to the HI and LO calibrator

binding posts. Figure 3 shows the correct connections. Table 9 lists the

cable connections.

3. Call

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

4. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_CURRENT

• Range = 0.01

• Resolution = 10e–9

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

before applying current.

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

NORM.

7. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

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

9. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

10. Call

niDMM_ConfigureMeasurement with the following

parameters:

• Function =

NIDMM_VAL_AC_CURRENT

• Range = 0.1

• Resolution = 100e–9

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

limits listed in Table 20.

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

13. Call

niDMM_Read. Verify that this measurement falls between the

limits listed in Table 20.

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National Instruments 1/2-Digit User Manual Page 33