I'm really sorry to open some series of questions but since the issue is complicated I decided to open a separate question for a particular thing for not creating confusion:
There is the red loop in below diagram which might be causing the EMI pickup I was told here. And then there is a second loop across the power supplies and the earth GND, usually is capacitively coupled.
It seems my main issue is the red loop. The long wires and the loop I guess pick up EMI.
But how can I physically star ground and minimize that area of the red loop or eliminate the loop? Or without any stargrounding is there a possible way to elimiate such spike only at node X. Here is another illustration where blue lines are showing grounds:
How can I filter the spike like noise due to EMI at the DAQ input node X? Are there ways worth to try? The spike occurs at all supply outputs but it is only an issue if it appears at node X in my case because of a software thing not hardware upset. Would a filter and an optocoupler be worth to try?
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