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NI 4070/4072 Calibration Procedure 48 ni.com
• If you are not performing additional adjustments, refer to one of the
following sections:
– Verification Procedures—to verify your new calibration
coefficients before saving them to the EEPROM
– Completing the Adjustment Procedures—if you do not want to
verify the adjustments you have just made
Adjusting AC Voltage (AC- and DC-Coupled) Modes
Note If you do not use the AC voltage modes for any measurements, or the accuracy of
these modes is irrelevant, you can skip this section in the calibration procedure and go
directly to the Adjusting Current Modes section.
To adjust the AC voltage 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 into 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.
3. Refer to Table 11 for the appropriate calibrator output and parameter
values as you complete the following steps:
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 11 for the current iteration.
b. Call
niDMM_CalAdjustGain with Mode set to
NIDMM_VAL_AC_VOLTS. Set the remaining parameters as shown
in Table 11 for the current iteration.
c. Call
niDMM_CalAdjustGain again, changing Mode to
NIDMM_VAL_AC_VOLTS_DCCOUPLED.
4. Repeat step 3 for each of the remaining iterations listed in Table 11.
Table 11. niDMM_CalAdjustGain Parameters
Iteration
Calibrator Output niDMM_CalAdjustGain Parameters
Amplitude
f
(kHz)
Mode
Range
(V)
Input Resistance
Expected
Value
1 50 mV 1 NIDMM_VAL_AC_VOLTS 0.05 NIDMM_VAL_1_MEGAOHM 0.05
50 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 NIDMM_VAL_1_MEGAOHM 0.05
2 500 mV 1 NIDMM_VAL_AC_VOLTS 0.5 NIDMM_VAL_1_MEGAOHM 0.5
500 mV 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 NIDMM_VAL_1_MEGAOHM 0.5