Error -1074118574 Using Remote Sense with Source Measure Units

Updated Jan 9, 2019

Reported In


  • PXIe-4135
  • PXIe-4136
  • PXIe-4137


  • NI-DCPower

Issue Details

I occasionally get the following error on my Source Measure Unit (SMU): 

Error -1074118574: An error has been detected with the sense leads. This error could result from a reversal or incorrect connection of the sense lines. Please verify your hardware configuration.


This error is triggered by the Sense Lead Error Detection feature of the PXIe-4135, PXIe-4136 and PXIe-4137.

If once of these cards detects that the remote sense terminals are connected improperly, it will shut down the output and enter into an error state. Commonly, when this error occurs, the improper connection involves reversing the polarity of the sense terminals, shorting the sense leads together or having a loose connection of the local sense HI or LO. If you see the error, verify that the remote and local sense lines are properly and firmly connected and then reset your device.

Notice the error state will not occur if the sense leads are disconnected because internal 1MΩ resistors between HI and HI SENSE, and LO and LO SENSE, keep the output close to the requested value, but with decreased accuracy and no error or warning.

This error will not occur if the device is programmed for Local Sense only operation.

Additional Information

These cards monitor the voltage differential between HI and HI SENSE and will generate the error if the voltage surpasses the specified maximum of 3 V per wire. The voltage differential between LO and LO SENSE is monitored in the same way.

Loose connections to the HI or LO can be equivalent to increasing the resistance of the leads connected to them. If this resistance is high enough, the voltage difference between the remote and local sense circuits can increase past 6 V (2 wires at 3 V per wire), triggering the error state.

Sense Lead Error Detection is a feature for detecting problems with the remote sense lines of an SMU. Refer to the Remote Sense page in NI DC Power Supplies and SMUs Help for more in-depth explanation of remote sense.


Not Helpful