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

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If you are not performing additional adjustments, refer to one of the 
following sections:

–

—to verify your new calibration 

coefficients before saving them to the EEPROM

–

—if you do not want to 

verify the adjustments you have just made

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 

 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

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