Products > Test Equipment
Fun With Low Leakage/Bias Current: Femtompere, Electrometer, Keithley 617
r6502:
Hello analogNewbie and to all others,
if you remove one lug of the triax connector, you will become stability problems with the connections. I've often seen connection problems already with the 2 lug connectors in the company's and my private test equipment.
I on my equipment (K616 and K617) the older triax pugs that have 2 lugs are assembled, and I use the connectors for two lugs. You can look at e-bay to get connectors NOS from time to time for a good price.
If you want to use the triax connectors with 3 lugs, replace the connectors in your devices this is really the better way - believe me. This helps that the connector will be correct centred and so it will get a stable and good connection for your measurements.
Kind regards Guido
DavidKo:
You can buy 3 lug cable on ebay (new, with blue cable), buy a new 2 lug connector from ebay (it is the same connector only they have used 2 lug locking, probably same as on BNC) and switch only the part of the connector for one with 2 lugs. The whole front part can be exchanged in a minute or two. It is probably the cheapest way how to get the working cable. I have bought one with BNC on the another end which I have cut out and put the crocodiles instead.
Be careful, there are triax cables and twinax cables on ebay (I have seen only twinax cable with 2 lug TRB connector, resp. cables with crocodiles seems to be twinax too). Both are blue, seems to have the same thickness and the connectors available on ebay are suitable for both type of cables.
zrq:
I was able to acquire some old low-noise Keithley 2-lug triax connectorized cables (Keithley 6011, 7025 and 7024-3) and a Suhner BNT triax cable, which are useless to me after the connector change of my 617. I may create a thread selling them later (EU) for a price reasonable for hobbist after some testing (say 40 EUR each+shipping), but let me know if any one interested before that.
DavidKo:
Visual example how it can be done ;-)
Alex Nikitin:
I've just repaired GPIB on my 617 (replaced the faulty TMS9914AML GPIB processor) and also copied the firmware (revision B4), if anybody needs that revision, please let me know.
Cheers
Alex
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