The Issue of Excessive FPGA Temperatures in VST

Updated Nov 1, 2023

Reported In


  • PXIe-5841
  • PXIe-5840
  • PXIe-5646
  • PXIe-5644

Operating System

  • Windows

Issue Details

I am using the Vector Signal Transceiver (VST) PXIe-5840, and during my use, I encountered an FPGA temperature issue. See figure below: 

Immagine 2021-04-02 092524.png


When you are facing this kind of issue, you need to do the following steps:
  1. Initially, you need to switch the FAN SPEED of the Chassis from Auto to High. 
    1. If you're using the PXIe-1085 and later Chassis, you can perform switching from the back end.52.png
    2. In newer Chassis (PXIe-1092 and newer), you should perform it from NI-MAX (NI Measurement & Automation Explorer).Screenshot 2021-07-23 111754.png
  2. You need to clean the fan filters by following this guide or refer to the user manual of your specific Chassis.
  3. If the aforementioned doesn't help you, please contact NI support.

Additional Information

This article can also be used for other Radio Frequency (RF) HWs - Vector Signal Generator (VSG), Vector Signal Analyzer (VSA), Oscilloscopes, etc.

Also, NI recommends keeping FAN SPEED to HIGH, when you work with RF HW.