Re: signal leads that pick up less ambient noise?

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.