Chapter 5 Using the SCXI-1125
© National Instruments Corporation 5-31 SCXI-1125 User Manual
One-Point Offset Calibration
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
Gain Range (±)
15 V
22.5 V
51 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