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Electronics => Projects, Designs, and Technical Stuff => Topic started by: SArepairman on September 04, 2013, 06:30:40 am

Title: potting low leakage? (electrometer probes)
Post by: SArepairman on September 04, 2013, 06:30:40 am

I would like to make a triaxial cable probe. I was going to solder teflon wire to the triaxial cable end (cutting and unraveling it) but I am unsure if it is possible to ruggadize this connection.

I was thinking about putting epoxy or GOOP strain relief on the solder joint, but I don't really know if it will effect the reading on a electrometer.

I guess the other method would be to cut some grooves into teflon plates and press the wires in there, so they are press fit and the pressure provides strain relief without a glue type compound.

Title: Re: potting low leakage? (electrometer probes)
Post by: qno on September 04, 2013, 10:13:34 am

Carefull a lot of nylons are hygroscopic.
His will increase leakage.

Teflon is until now the best. Free air is better.

Title: Re: potting low leakage? (electrometer probes)
Post by: alm on September 04, 2013, 10:36:54 am

Did you read the Keithley low level measurement handbook (available from their website)? It contains several hints how to reduce leakage, which insulation materials perform the best, guarding, etc.