On Fri, December 18, 2015 6:11 pm, Charles Steinmetz wrote: > If you're careful with what goes on inside the box you won't > *cause* any circulating ground current.
You are going to get at least a little circulating ground current because of power supply parasitics, and for equipment running from different power feeds you are going to get a lot of circulating ground current. My understanding is that is the reason the capacitively coupled BNC connectors were originally developed, they were used on the inputs of telecom equipment which could have signals coming from a different building, running on a different power transformer. You can get up to a couple volts of ground potential difference pretty easily. I agree that for the typical test equipment case where all the gear is running from the same power feed it likely should not be necessary. But putting the connectors on opposite sides of the PCB is still just asking for trouble. -- Chris Caudle _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
