SCXI-1125Calibration Procedure 4 ni.com
Setting Up Your ModuleComplete the following steps to set up your module for testing:
1. Installthe SCXI-1125 in slot 1 of the SCXI chassis.
2. Connect a 68-to-68-pin cable between the SCXI module and the
ESeries DAQ device installed in the host computer.
3. Configurethe hard warewith Measurem ent & Automation Explorer
(MAX). For more information on configuring the system, refer to the
ES eries deviceand SCXI module documentation .
Verifying Gain and Offset ErrorsTheverification procedure determines how well the SCXI-11 25 module is
meeting its specifications.You can use this information to select the
appropriate calibration interval for your application.
Completethe following steps to verify gain and offset errors in the
SCXI-1125:
1. Read the Test Conditions section earlier in this document.
2. Refer to the specificationsin Table 1 at the end of this document.
3. Connect the E Series deviceto the SCXI-1125.
4. Call Calibrate_E_Seriesto minimize the uncertaintyassociated
with the E Series devicemeasurements. Set the fo llowingparameters:
•deviceNumber—The valueassigned by MAX
•calOp—ND_SELF_CALIBRATE
•setOfCalConstants—ND_USER_EEPROM_AREA
•calRefVolts—0.0
5. CallAI_Configure to put the E Series device in bipolar mode. Set the
followingparameter s:
•deviceNumber—The valueassigned by MAX
•chan—0
•inputMode—0
•inputRange—0
•polarity—0
•driveAIS—0
6. Call MIO_Config to enabledithering on the E Series device. Set the
followingparameter s:
•deviceNumber—Thevalue assigned by MAX
•dither—1
•useAMUX—0