[volt-nuts] HP 3457A calibration?

[Joseph Gray]

I have replaced this type of battery in other equipment, so it isn't a big
deal for me. I'm sure I can do it without losing the cal data.

Joe Gray
W5JG
 On Aug 20, 2013 9:43 AM, "Dr. David Kirkby" <drkirkby at gmail.com> wrote:

> On 20 August 2013 14:51, J. L. Trantham <jltran at att.net> wrote:
> > If the battery is 'OK', I would favor just sending it to Agilent for
> > calibration, unless you can 'SAFELY' change the battery while preserving
> the
> > cal data.
> >
> > Good luck.
> >
> > Joe
>
> If one accepts there is some risk changing the battery while
> preserving the data, one has two choices.
>
> 1) Do as you say and leave the battery, preserving the cal data. This
> however risk the battery leaking at some time.
> 2) Change the battery, losing the cal data, but virtually eliminating
> the risk of leakage.
>
> To me at least, the path of least risk is the one to take.
>
> I suspect if one put a power supply in parallel with the battery with
> a 10 k resistor in series, then the 10 k resistor would not drop
> enough voltage to lose the ram data, but if it was accidently shorted
> the current would be limited to a few hundred microamps. That's
> unlikely to do any damage
>
> I guess for a volt nut, preserving the cal data is more important than
> it is to me. Not damaging the meter is higher on my priority list.
>
> Dave
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