[volt-nuts] Eppley Standard Cell and What Is It?

[gbusg]

John wrote:
>Some types of cells really do not
>like being inverted. It is designed to work into an open circuit....  ie:
>potentiometric comparison.

>From the Solartron 7081 specs I see its DCV input resistance is >10G ohms for 0.1 thru 10 V ranges. 

Have any of you Solartron 7081 users looked to see if there are reverse switching transients present at its front DCV input jack while in its DCV mode?

In the case of the HP 3458A, you can temporarily turn-off Auto-Zero, which, I *think* should minimize if not eliminate any possible switching transients present at its front DCV input terminals. By comparison I'm not sure how this works with the Solartron 7081?

Disclaimer: I've not personally characterized any possible reverse switching transients present at the 3458A input terminals. But, in theory I think I'd temporarily turn-off Auto-Zero immediately prior to connecting to the Eppley. 

Admittedly the Eppley was originally designed to work into infinite load resistance (potentiometric comparison back in the old days when DCV meter input resistance was lower than for the 7081 and 3458A).

Comments?

Greg