Re: signal leads that pick up less ambient noise?

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?

--
Christopher Howard