I am working with instruments that have the 120vac mains ground pin tied to the chassis. The 12vdc and 3.3vdc returns are also tied to the chassis. The dc is used for some detectors, solenoid valves, stepper motor, small fan, and logic. So there are some quiet and some noisy dc devices. In the past, I have preferred to keep the ac ground and dc returns separate. The instruments work ok, but I wonder if the detector signals could be helped a bit by separating the ac gnd and dc return. Any suggestions?
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