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From: John Larkin <jjlarkin@highlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: signal leads that pick up less ambient noise?
Date: Fri, 21 Feb 2025 16:14:26 -0800
Organization: highland technology
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On Fri, 21 Feb 2025 18:33:31 -0500, Joe Gwinn <joegwinn@comcast.net>
wrote:

>On Fri, 21 Feb 2025 11:53:44 -0900, Christopher Howard
><christopher@librehacker.com> wrote:
>
>>> I found it essential to have a big die cast metal box with coax
>>> connectors and low-pass feed-throughs mounted in the walls when
>>> testing sensitive circuits.  A desktop faraday cage.  Plus lots of
>>> coax cables between test equipment and the circuit within the box.
>>
>>Could you clarify/expand on what exactly you are using for the low-pass
>>feed-throughs and what that looks like? Are you talking about two
>>separate things on the coax and feed-throughs, or like a coax connector
>>attached to an RC filter?
>
>Google for coaxial feed through capacitors.
>
>.<https://www.engineering.com/the-engineers-guide-to-feedthrough-capacitors/>
>
>.<https://www.ketemicro.com/tec_info28.html>
>
>With die cast aluminum boxes, it's best to use a nut to hold the feed
>through in place, rather than a threaded hole.
>
>One can also mount probe pin jacks and the like in the box walls.
>There's lots of space.
>
>Joe

The Danish Butter Cookie cans are solderable. The downside is that you
have to empty them before you can put electronics inside.

Neither they nor the die-cast boxes shield 60 Hz mag fields very well.