Why SMU Output Is Still Enabled After Closing The Session?

Updated Oct 16, 2019

Reported In


  • PXIe-4145
  • PXIe-4139


  • LabVIEW

Issue Details

  • I have closed my SMU session, but I can still measure the voltage output using voltmeter.
  • Why I can still measure voltage drop across resistor after I closed the SMU session.


When you close a session to a device, the device continues to operate in its last configured state. If you close the session while the output channels of the device are enabled and actively sourcing or sinking power, the device continues to source or sink power until it is disabled or reset.

So you need to include niDCPower Reset.vi to stop the device from continuing sourcing.

Additional Information

Closing a session is essential for freeing resources, including deallocating memory, destroying threads, and freeing operating system resources. You should close every session that you initialize, even if an error occurs during the program.