DCFluX wrote: > It is not Triax, I generally refer to this connector as 'Security > BNC'. Had one in the junk box and put it on a cable and it then I > discovered they were incompatible when I went to put it on the radio.
There are quite a few Agilent / HP (and other mfgs) instruments that use a triax BNC as shown in the referenced Amphenol link. A couple examples are: HP-4140B Picoammeter / Source. HP 4155C Semiconductor Parameter Analyzer <http://www.amphenolrf.com/products/triax.asp?N=0&sid=48867480942E17F&;> The triax connectors and cables are used to allow an inner conductor, a guard shield (or floating return), and an outer shield. This is about the only effective way of making accurate fA measurements (especially in a semi noisy lab environment). If you have an instrument with a triax BNC connector on it, and you measure from the outer metal to the inner gold shield, they are not connected as in a 'normal' BNC. Ed Yoho W6YJ (coming up on 40 years in the semiconductor test field - sigh, must be getting old)
