sbRIO 9651 Chassis Shielding

[nico1981-2]

Hello, i have a maybe easy to solve problem:

Our sbRIO is implemented in a device that has a shielded chassis. The SOM is attached (electrically connected - metall on metall) to this chassis and uses the housing as a heat sink. I dont want the housing of the SOM to be grounded.

So the question is , can the housing of the SOM be a shield (thats somehwere else connected to ground) or is it internally grounded in the Som, so that the shield would be grounded through the SOM then?

Thanks for your help.

Best regards,

Nico

[nanocyte]

I'm just going to copy paste from the user manual:

Ground Connections
The sbRIO-9651 SOM provides the following ground connections:
• The mounting holes and heat spreader are connected to chassis ground.
• All grounds on the J1 connector are connected to digital ground.
• Chassis ground is capacitively coupled to digital ground near each mounting hole.
Refer to the NI sbRIO-9651 System on Module Carrier Board Design Guide for more
information about grounding best practices.

http://www.ni.com/pdf/manuals/376962c.pdf

Also, you might be interested in the custom hardware forums:

https://forums.ni.com/t5/Hardware-Developers-Community-NI/gp-p/5058