[time-nuts] FW: Plugs on the FE 70E

Chuck Harris cfharris at erols.com
Mon Jun 20 15:37:08 EDT 2005

Hi Mike,

I've never quite understood why the HP3437A, a 0-10V, high speed system
voltmeter uses them, but it does.  The Keithly 616 makes more sense because
the extra shield allows them to run a guard.  Something important on an
electrometer where the impedances are effectively infinite.

It sounds like your application doesn't need the capability, so it might be
best to swap them out for simple isolated BNC connectors.

I am certain that the mating Trompeter connectors will cost at least $20 each.


Mike Feher wrote:
> Chuck -
> Well, I can maybe see the justification on some sensitive instruments
> measuring down to the nanovolts. However, here we are talking about a good
> several volts, and low impedance, where the isolation, at least from what I
> would surmise, would not be as critical. My 6 1/2 digit HP voltmeter only
> uses banana jacks, but, it does give you a four wire (Kelvin) connection
> capability if you want to use it. Well, at least some one has seen these
> before. Where have I been all my life? -  
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960

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