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

Bill Gold wpgold3637 at att.net
Sun Sep 24 03:52:44 EDT 2017


    Your answer to question #1.  I have a spare reference board setup to be
powered up on the bench.

    I measure around 36 ma when it starts cold and then around 30 ma when it
warms up to operating temp.  This is at 18 volts.

    Of course this is in an enclosed, insulated box.  If the LTZ 1000 starts
to cool off then the current goes up again.


----- Original Message ----- 
From: "Dr. David Kirkby (Kirkby Microwave Ltd)"
<drkirkby at kirkbymicrowave.co.uk>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Saturday, September 23, 2017 7:45 AM
Subject: [volt-nuts] Power consumption of 3458A reference board / fittingone
in a 3457A

> 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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