Adjusting Residual Voltage Offset
Eliminate residual offset voltage at 0 V by configuring and calling the niDCPower Cal Adjust
Residual Voltage Offset VI or niDCPower_CalAdjustResidualVoltageOffset
function.
Closing the Adjustment Session
Close the session and commit the new constants to hardware by calling the niDCPower Close
External Calibration VI or niDCPower_CloseExtCal function and specifying Commit as
the calibration close action.
Alternative to Performing Adjustment Procedures
If your device passes all verification procedures successfully and you want to skip updating
the calibration constants, you can update solely the calibration date by completing the
following steps.
Note NI recommends following all adjustment procedures in order to update the
calibration constants and renew the device calibration interval.
1. Call either the niDCPower Initialize External Calibration VI or the
niDCPower_InitExtCal function.
2. Call either the niDCPower Close External Calibration VI or the
niDCPower_CloseExtCal function, specifying Commit in calibration close action.
Reverification
After completing adjustment, wait a minimum of five minutes for the internal device
temperature to stabilize. Repeat the Verification section to determine the as-left status of the
device.
Note If any test fails reverification after performing an adjustment, verify that you
have met the Test Conditions before returning your PXIe-4139 to NI. Refer to the
Worldwide Support and Services section for information about support resources or
service requests.
Related Information
Test Conditions on page 3
Verification on page 5
Worldwide Support and Services
The NI website is your complete resource for technical support. At ni.com/support, you have
access to everything from troubleshooting and application development self-help resources to
email and phone assistance from NI Application Engineers.
NI PXIe-4139 Calibration Procedure | © National Instruments | 23
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