NI 449x and 446x Chassis Compatibility in the PXI Advisor

Updated Oct 14, 2020

Reported In

Hardware

  • PXIe-1078
  • PXI Sound and Vibration Module
  • PXIe-1071
  • PXIe-1073
  • PXIe-4464
  • PXIe-4463
  • PXI-4461
  • PXI-4462
  • PXIe-4492
  • PXIe-4496
  • PXIe-4497
  • PXIe-4498
  • PXIe-4499
  • PXI-4495
  • PXIe-1088

Issue Details

I'm using the PXI Advisor to build a PXI(e) system. When I select a chassis such as the PXIe-1078, PXIe-1071, PXIe-1073 or PXIe-1088, all the NI 449x and 446x modules appear grayed-out or I receive an incompatibility warning.

Why I can't select a NI 449x or 446x module using these chassis? 

Solution

The NI 449x and 446x DSA modules are high-sensitivity cards that are meant to operate in specific conditions. If you are measuring low noise acoustic signals, the fan noise of a chassis with a fan underneath the card slots can interfere with measurements. 

Chassis such as the 107x series and the 1088 have fans on the bottom which introduces electrical and mechanical noise that the modules pick up. This raises the noise floor of the DSA card causing it to be out of specifications inside these chassis.

It is recommended to use a high-performance chassis (like the PXIe-1092) or any chassis where the fans aren't located on the bottom of the chassis.