Re: Just for your info

Posted by Bold Eagle (A) on January 1, 2004 at 07:01:29

In Reply to: Re: Just for your info posted by Russ57 on December 31, 2003 at 12:22:43:

Russ,

Thanks for the heads up. I've always specified isolated ground receptacles for the calibration areas and other critical instrumentation areas. A separate pulled ground wire for each receptacle (star grounding, basically). In the last good lab I had, we used a triple Faraday shielded isolation transformer for our power, and the ground for the lab was 6" diameter, 3/8" wall copper pipe run under the computer flooring. That was tied to a driven ground that was dedicated to our lab. I get the idea of balanced power, you're saying it makes the noise common mode? It would seem to be common mode in the secondary only if it comes in from outside, on the primary. Noise generated on one leg from the secondary side would not be, would it?

If hospital grade doesn't get you an isolated ground, what makes it hospital grade?

Jerry

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