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Cheap triax connector ?
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PedroDaGr8:
This is a thread I am very interested in. Would be nice to find some affordable triaxial setups to test with. In particular, I wish there were some affordable triax to bnc adapaters even those seem damn expensive. I have a Keithley 236 that uses these things and it would be nice to utilize the sense lines and what not. I don't anticipate doing measurements taht are sensitive enough to need the guard of the triaxial cable. A BNC should work fine.
(*steve*):
I also have a piece of equipment with a 2 lug triax connector and cables that are 3 lug.  This thread had more useful information than the rest of the internet combined, so maybe I can add a little to it. :-)

I finally discovered that a Pomona 5299 is a 2 lug to 3 lug adapter and A couple of sellers on ebay have these for reasonable prices. (I got one for less than $US20)

There's also a seller with over 200 "Trompeter PL75-24A Triax Triaxial Cable Connector" for $US10 each.

It's also worth looking for "Trompeter BJ72" as there are a few bargains to be had at the moment.

These are reliable brands (I am not connected to any of the sellers), so might be a cheap option to fix some triax connector woes.
alm:

--- Quote from: (*steve*) on June 17, 2017, 04:48:48 am ---I finally discovered that a Pomona 5299 is a 2 lug to 3 lug adapter and A couple of sellers on ebay have these for reasonable prices. (I got one for less than $US20)

--- End quote ---
You sure you got that model right? Pomona 5299 is a 3 lug triax (male) to BNC (female) adapter with shield shorted to guard (not good for anything with an active guard like a SMU).

There are also adapters from triax to BNC with either triax shield connected to BNC shield with guard open (e.g. Trompeter ADBJ20-E2-PL75) or guard connected to BNC shield with triax guard open (e.g. Trompeter ADBJ20-E1-PL75). The former is safer (shield tied to ground), especially on the high side, but the latter performs better for low currents (keeps guard) and can be fine for the low side where guard is very close to ground, low voltage work or setups where the connector and cable shields are protected from touching.

All of this is three lug. Two lug triax is legacy and my suggestion is to either change the connector to two lug (there is an old thread about changing a Keithley 220 output connector from two lug to three lug on this forum), or get a 3-lug to 2-lug adapter (e.g. Keithley 6172), or make one from a 2-lug male, short length of triaxial cable, and 3-lug female.


--- Quote from: (*steve*) on June 17, 2017, 04:48:48 am ---There's also a seller with over 200 "Trompeter PL75-24A Triax Triaxial Cable Connector" for $US10 each.

It's also worth looking for "Trompeter BJ72" as there are a few bargains to be had at the moment.

--- End quote ---
Make sure (as is the case for these two) that whatever you are buying is for TRB connectors. There are also thread, larger and smaller versions that are not compatible. This document shows some of the variants.
pmcouto:
Keithley 6172 is a 2 slot male to 3 lug female Triax adapter.
But it’s not cheap…

http://pt.farnell.com/keithley/6172/triax-adapter-2slot-male-3lug/dp/2672724

Regards,
Pedro Couto
alm:
Few things related to triax are cheap. Depending on how you acquire them, a 2-slot male connector, piece of triaxial cable and 3-slot female connector may not be that much cheaper. I believe Pomona and Trompeter may make similar adapters, but I do not have the part numbers handy and I am not sure if they are still current products. Is there any equipment currently in production that uses 2-slot triaxial connectors?

Also you may not have to pay list prices. Things might be available on eBay, or even through regular distributors that have surplus stock. I paid much less for mine brand new from Top Elektronik a number of years ago.
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