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Old December 11th, 2002, 03:31 AM   #14
United States

drewcrew6 is offline
Join Date: Apr 2002
Location: allentown, Pa
Posts: 418
rogerhollingsworth states
Tying the Negative leg of the DC power supply to ground is not a good idea, it compromises the isolation between the AC and regulated DC.
What isolation do you mean by that? I'm not sure if I'm missing something. The regulation is between the ouput points and shouldn't be affected by a ground potential at one.

It makes sense to me that you have a possible safety situation when things aren't grounded .

As I had stated I always like to see almost any power source (controls are a must!!) "grounded" at one point (preferably the comm on dc and must be done at the source termination point!!)to keep things at a certain reference. Thermocouple cards don't seem to like non grounded supply voltages.There are some exceptions :any thing higher than 120v for specific reasons like heaters

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