Do you follow a specific approach when it comes to grounding the board to the enclosure and consequently to the rest of the equipment? Specifically, I noticed that the RPi5 under the ethernet port has a metallic tab marked TP73 which is connected to the ground of the board and it looks like it’s there on purpose to ground the board to a metallic enclosure potentially.
I am not sure if you have dealt with this issue or if you have a specific recommendation: ground or avoid grounding the board to the enclosure/equipment?
You are probably not using RPi5 going forward, but the same thing might come up with any electronics carried on farming equipment? I am not sure if any electric surges would affect any electronics if grounded.
Haven’t followed any specific grounding principles for the RPi5 versions to date. They seem to have performed fine, though I have not noticed/heard about the TP73 tab. The risk with connecting the tab to a metal enclosure and the enclosure to the equipment is creating a ground loop, so I would be a little hesitant there.
The CM5 versions we have had tested in accredited labs to automotive standards for surges, induced noise/surges in all cables, ESD and radio immunity and it passed all. Surge testing was pretty harsh as well - dropping to -75V then going back to 12V repeated 5000 times. Tested up to +125V as well. Radio immunity testing showed that the enclosure + PCB was effective at handling radio noise across a large part of the MHz and GHz frequencies. So I am quite confident in the performance of the new design. Would 100% recommend using S/FTP high quality ethernet cables though. The shielding makes a huge difference.
Here’s the post on the CE testing, we’ll release all the test reports as well so everyone can check them out
CE Testing Starts on OWL3.0