National Instruments SCXI -1125 用户手册

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To perform offset calibration on your module, follow this procedure if you 
are using LabVIEW:

1.

Make sure the DAQ device or DMM you are using has a valid 
calibration and meets the accuracy specifications for your application.

2.

In LabVIEW, use the SCXI Calibrate VI to calibrate your module.

a.

Enter the DAQ device and the SCXI channel string for the 
channels you want to calibrate.You can calibrate only one channel 
at a time.

b.

Select internal calibration as the calibration operation you are 
going to perform.

c.

Select the Default EEPROM load area as the area you want to 
update.

d.

The offset varies with the selected gain value. Therefore, enter the 
high and low limits that correspond to the gain value for which 
you are calibrating offset. Refer to Table 5-9 for a list of the gain 
values and the corresponding input limits you must enter.

e.

Enter 0.0 as the input reference voltage.

3.

Run the application.

4.

Repeat steps 2 through 3 for calibrating the offset for additional 
channels or gain combinations.

Table 5-9.  Gain Values and Input Limits 

1

5 V

2

2.5 V

5

1 V

10

0.5 V

20

0.25 V

50

0.125 V

100

0.05 V

200

0.025 V

250

0.020 V

500

0.010 V