[time-nuts] Ground loops in measurements?

Tom Knox actast at hotmail.com
Mon May 20 12:42:26 EDT 2013

Anyone who is serious about Time and Freq has run into ground loop problems, and finding a solution is often more "Art then Science"
A common solution is star grounding, Another approach is  grid work  grounding, another possible solution is to isolate each instrument.
Most often some trial and error is required, and nothing is as valuable as the intuition that comes from years of experience. As you experiment, documenting each change can often help not only towards a immediate solution, but also if problems arise from future changes in your system.

Thomas Knox

> Date: Mon, 20 May 2013 14:08:03 +0200
> From: attila at kinali.ch
> To: time-nuts at febo.com
> Subject: [time-nuts] Ground loops in measurements?
> Moin,
> A couple of weeks ago, there was a short discussion on "bad" connectors
> and cables and the coupled in noise of those. Summarized it said that
> measurements in the time-nuts scale are very sensitive to even the lowest
> noise levels and coupled in signals.
> But, all the measurements we do are done using some sort of coax which
> have their shield connected to the case of the devices. As the invovled
> devices in a measurement are also grounded over their power supply
> this will lead to ground loops and thus a 50/60Hz noise. Also, because
> loops are good magnetic antennas, a lot of other noise floating around
> in the ether is coupled in (eg a nearby radio station).
> How do you handle this kind of problems?
> 			Attila Kinali
> -- 
> The people on 4chan are like brilliant psychologists
> who also happen to be insane and gross.
> 		-- unknown
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