HP 3437A Manual

It looks like a three-lug Triax connector to me. Used by a lot of Keithley test equipment. Two shields. The inner shield sometimes driven and called a "guard". Good for very low level high speed measurements. You should be able to get an adaptor to BNC.

Steve J. Noll | Ventura California | | The Used High-Tech Equipment Dealer Directory |

Steve, Thanks so much, I've never seen one like that before. You think I could just replace it with a BNC connector?

Thanks Mike

Yes, I think so. Probably want to use the outer shield and leave the inner one unconnected. Would be a lot cheaper than purchasing the Triax-to-BNC adaptor, which I believe also doesn't use the inner shield. I have purchased them before at the day job - I think from either Newark or Allied.

FWIW - to make matters worse, there are two-lug Triax as well as three-lug! Keithley equipment uses both kinds. Triax jumper cables are quite expensive, but I found the connectors themselves and the cable aren't too bad $ and have started making them myself - but they are very difficult to assemble.

Steve J. Noll | Ventura California | | The Used High-Tech Equipment Dealer Directory |