Re: signal leads that pick up less ambient noise?

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