[volt-nuts] Fluke 750a batteries.............
cfharris at erols.com
Fri Sep 25 10:03:27 EDT 2015
The usual solution is to find an alkaline pack that gives you a
few volts more than you need, and use a voltage regulator to
regulate down to the desired voltage.
The rub becomes finding a voltage regulator that gives you the
magic combination of accuracy and stability that you need for
In this case (I don't have the schematic in front of me) it doesn't
sound like the mercury cells are being used for their modest
stability, but rather for their compact size, and long life.
Regulation might not be all that necessary.
Drop Wein cells from your memory bank! The only thing they are
suitable for is hearing aids, and only because they have a near
infinite shelf life, as long as the tab isn't pulled. Once the tab
is pulled, they consume oxygen from the air around them, and make
Some misguided folk have specified them for use in Accutron watches,
where they quickly use up all of the oxygen in the watch case, and
replace it with much needed moisture to help the watch parts rust.
David Garrido wrote:
> Hello All,
> I posted this over at the HP yahoo group as well, so pardon the redundancy if you
> belong to both or more.
> My new to me Fluke 750a reference divider arrived last evening and I have been
> having one heck of a time finding info on replacement battery options others have
> used on their 750a's. Fluke spec'd (2) 6.7v mercury cell batteries for the
> overload protection circuit and these are clearly no longer available. What is
> everyone using for power? I am hoping to not use a separate DC supply for this
> The only manual I can find is here:
> I have been able to find Wein batteries that are 1.35v zinc/air and I could stack
> and shrink wrap 5 of those in series to arrive at 6.75 very stable volts, but they
> are a minimum of $4.50 each cell. I was hoping to find a more affordable /
> elegant solution.
> Will the circuit handle (2) 3.6v Li-Ion in series instead?
> Any thoughts?
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