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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: signal leads that pick up less ambient noise?
Date: Fri, 21 Feb 2025 14:38:43 -0500
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"Christopher Howard" <christopher@librehacker.com> wrote in message news:87wmdjm7pg.fsf@librehacker.com...
>I wanted to mention that this morning I moved the old PC computer box
> about ten feet away from my work station, and that reduced the noise
> down immediately to about 100 mV p-p, from the original 500 mV p-p.
>
> After doing that, I tried running the signal from the signal generator
> through a simple lowpass RC filter, with R=200? and C=1�F. This drops
> the noise down some more to about 40 mV p-p.
>
> I also moved the signal generator closer and am using some very short
> leads with alligator clips. This doesn't seem to have much effect on the
> noise, as far as I tell, but it seemed like a good idea in principle.
>
> I like the idea of putting my analog computer inside a metal box, but I
> don't currently have a spare metal box, and also that would hide all the
> switches, trim pots, and terminals. I have an idea though of moving this
> direction later after building some kind of patch panel. I also wonder
> if it might be helpful at least to have the bottoms and sides of the
> analog computer surrounded by metal, i.e., set it inside an open metal
> box.

Have a look at "Design Considerations" on this page:

https://www.gamry.com/application-notes/instrumentation/faraday-cage/

>
> -- 
> Christopher Howard