National Instruments NI 4070/4072 6 1/2-Digit FlexDMM 用户手册

•

To finish the calibration and close the session, go to the Completing the 
Adjustment Procedures section.

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.

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 

 section.

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.

Table 15.  NI 4070/4072 DC Voltage Verification Limits

0 V

1 V

>10 G

Ω/10 MΩ

–6

μV

6

μV

–2

μV

2

μV

0 V

10 V

>10 G

Ω

/

10 M

Ω

–60

μV

60

μV

–20

μV

20

μV

0 V

100 V

10 M

Ω

–600

μV

600

μV

–200

μV

200

μV

0 V

300 V

10 M

Ω

–6 mV

6 mV

–1.8 mV

1.8 mV

100 mV

100 mV

>10 G

Ω

/

10 M

Ω

0.099994 V

0.100006 V

0.099998 V

0.100002 V