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© National Instruments Corporation 25 NI 4070/4072 Calibration Procedure
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.