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NI 4070/4072 Calibration Procedure 42 ni.com
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
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.
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.
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.