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NI 4070/4072 Calibration Procedure 58 ni.com
• To finish the calibration and close the session, go to the Completing the
Adjustment Procedures section.
Completing the Adjustment Procedures
To complete the adjustment procedure for the NI 4070/4072 and close the
session, call
niDMM_CloseExtCal with the following parameter:
• Action =
NIDMM_EXTCAL_ACTION_SAVE if the results of the
calibration were satisfactory and you want to save the new calibration
coefficients to the EEPROM.
Otherwise,
• Action =
NIDMM_EXTCAL_ACTION_ABORT if the results of the
calibration were unsatisfactory and you want to restore the original
calibration coefficients to the EEPROM.
Verification Limits
This section includes the verification limits for DC voltage, AC voltage,
4-wire resistance, 2-wire resistance, DC current, AC current, and frequency
for the NI 4070/4072, and the verification tolerances for capacitance on the
NI 4072. Compare these limits to the results you obtain in the Verification
Procedures section.
Note Use the values in the 24-Hour Limits column for a post-adjustment verification only.
Otherwise, use the values in the 2-Year Limits column.
Limits in the following tables are based upon the February 2007 edition of the
NI 4070/4072 Specifications. Refer to the most recent NI 4070/4072 specifications online
at
ni.com/manuals. If a more recent edition of the specifications is available, recalculate
the limits based upon the latest specifications.
DC Voltage
Table 15. NI 4070/4072 DC Voltage Verification Limits
Calibrator
Amplitude
Range Input Resistance
2-Year Limits 24-Hour Limits
Lower Upper Lower Upper
0V 1V >10GΩ/10 MΩ –6 μV 6 μV –2μV 2μV
0V 10 V >10 GΩ/10 MΩ –60 μV 60 μV –20 μV 20 μV
0V 100 V 10 MΩ –600 μV 600 μV –200 μV 200 μV
0V 300 V 10 MΩ –6mV 6mV –1.8 mV 1.8 mV
100 mV 100 mV >10 GΩ/10 MΩ 0.099994 V 0.100006 V 0.099998 V 0.100002 V