Dave: Keep in mind that you can do grounding of the noise/ RF using a capacitor; not risking any potential shorts.
Of course, all cousions about 'ground loops' still apply. Tom At 08:54 AM 7/27/2008 +0000, you wrote: >I'm finally getting around to reinstalling my Z3801A after frying >and then fixing the on-board power supply, but I'm really paranoid >about doing it again (I had forgotten that the unit has a positive >ground). The external supply had floating outputs, the AC input was >grounded to the chassis and the case of the Z3801A was grounded. I >also realized that the external clock display board was grounded to >both the chassis and the internal ground of the Z3801A, which is >probably where the short came from. > >In this next attempt, the external PS AC input ground will be >eliminated and it's case will be isolated from the chassis. The >Z3801A will also be isolated from the chassis, as will the display >assembly. That leaves the RS232 cable, which is grounded as it >passes through the front of the chassis, and the signal outputs. > >Should I isolate the rs-232 as well? What about a double dc block >on the output signals? I realize this all sounds a bit extreme... > >-Dave. > >_______________________________________________ >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. _______________________________________________ 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.