User's Manual

NI 4070/4072 Calibration Procedure 54 ni.com
• If you skip this section and you want to verify the new calibration
coefficients before saving them to the EEPROM, repeat the
Verification Procedures section (except for Initial Setup).
• If you skip this section and you do not want to verify the new
calibration coefficients, go to the Completing the Adjustment
Procedures section.
To adjust the current modes of the NI 4070/4072, complete the following
steps:
1. Reset the calibrator.
2. Fasten the connectors on one end of the Fluke 5440 cable to the
NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten
the connectors on the other end of the cable to the HI and LO calibrator
binding posts. Figure 3 shows the correct connections. Table 9 lists the
cable connections.
3. Call
niDMM_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
NORM.
6. 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
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