[volt-nuts] Help needed identifying triaxial connector on HP 4339B high resistance meter - measures to 1.6 x 10^16 ohms.

[Stephen Locke]

It looks to me like a MIL-C-49142 style connector, however I'm not sure
what the rated voltage of that style connector is.

Either way, Trompeter sells their 370 series that are essentially threaded
BNC-size triax connectors that conform to the 49142 spec.  I believe
Trompeter is now absorbed into Cinch.  Maybe something like the PL375.
Digikey has some in stock that accept various cables.  The datasheet
drawings + calipers may be enough for you to confirm a match, or at least
this might be a starting point for you.

http://www.jrhelec.com/assets/images/manufacturers/cinch/catalogs/catalog.pdf
https://www.digikey.com/products/en/connectors-interconnects/coaxial-connectors-rf/437?k=pl375




On Sat, 17 Feb 2018 at 12:32 Florian Teply <usenet at teply.info> wrote:

> Hi David,
>
> Am Sat, 17 Feb 2018 15:32:15 +0000
> schrieb "Dr. David Kirkby" <drkirkby at kirkbymicrowave.co.uk>:
>
> > In order to use the meter, I would obviously need to be able to make
> > connections to it.
> >
> > Is there anyone here that knows what the triaxial (tri-axial?)
> > connector in the attached pictures ? One picture is of the female on
> > the 4339B and the other the male plug on a fixture that I don't have.
> >
> > The picture of the meter is not the one I have,  since the meter is at
> > Keysight. But it has a better picture of the triaxial connector than
> > the meter I have.
> >
> > Does anyone have a bit of trixial cable with one of these connectors
> > on?
> >
> Unfortunately, I don't know this kind of connector either.
> I can confirm however - which probably does help a bit still - that it
> is neither the three-lug BNC triax HP/Agilent/Keysight uses on all
> measurement equipment capable of going down to picoamp levels I have
> ever seen, nor  the two-lug BNC triax that Keithley uses for the same
> purpose. To me it seems to be a threaded connector, and dimension-wise
> should be pretty close to BNC, so TNC-style triax it might indeed be.
>
> But be prepared that these are a bit pricey, the last time I bought the
> standard three-lug BNC-style triax connectors they were about 80 Euros
> a piece.
>
> HTH,
> Florian
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