[volt-nuts] Power consumption of 3458A reference board / fitting one in a 3457A

[Todd Micallef]

Dave,

I have a 3457A but one thing I don't like about it is the native range is
3V vs 10V on most other bench meters. Also the input resistance on the 30V
range is 10Mohm. If you want to improve the reference for better readings
on the 30V range I would find another meter. The 3457A is great for being
quiet, light, and takes less room than a 3456A or 3458A but that's about it
for me. Maybe if you indicate if this is for a more specific purpose or you
just want to hack it. Either way, I would be interested to see if this can
be done.

I know ia LTZ hack has been done on a Solartron 7081 but I also know the
attempt failed on a Keithley 2001 by a few fellow volt-nuts.


On Sat, Sep 23, 2017 at 10:45 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> I've got two different, but not totally unrelated questions.
>
> 1) Does anyone know what is the power consumption of the 3458A reference
> board? I was thinking of getting one, boxing it up with a battery, that
> allowed it to keep running without mains power. I would like to know the
> energy storage the batteries would need to keep it running for 2 days.
>
> 2) Would there be any point fitting a similar board, with an LTZ1000A in a
> 3457A 6.5 digit meter? Would it be practical? I wonder if the drift on the
> 3457A's reference is significant, and so a LTZ1000A would be a worthwhile
> upgrade. Or is the main drift not the voltage reference, and so such an
> "upgrade" would be a total waste of time/money?
>
> Dave
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