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.
Table1 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
NI4 070/4072 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.