[time-nuts] Grounding a Z3801A

buehl buehl at superlink.net
Sun Jul 27 10:23:29 EDT 2008


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.
>
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