[volt-nuts] 732A and Prologix received

[Randy Evans]

Todd,

Thanks for the info.  I have several Panasonic 12V 7 AH batteries that I
keep topped off and they have very low current draw (~2 to 3 mA at 13.5
VDC) when charged and at their float voltage, so I am pretty sure they are
in good condition.  I will look at getting those in the units after I
ascertain the condition of the 732.

So now I have a what appears to be a functioning 3458A and a 732A but they
slightly disagree.  I am like the man with two watches that disagree on the
time  - which is correct?  For the moment, i am only concerned with
stability.  The need for absolute accuracy will come later.

Randy


On Fri, Aug 22, 2014 at 8:06 PM, Todd Micallef <tmicallef at gmail.com> wrote:

> Randy,
>
> You have two possible choices. It can be configured with 4 x 6v 4Ah
> batteries or 2 x 12v 7Ah batteries. Hopefully the previous owner has
> modified the battery pack already. A couple of mine needed a nibbler tool
> to remove enough of the aluminum cover that fits over the tops of the
> batteries. The original cover will short out to the battery tabs regardless
> of the battery configuration if this is not done.
>
> You can find larger capacity batteries that will give you slightly more
> battery life. I lost a couple sets of mail-order batteries after a few
> extended outages. I would recommend going with locally bought batteries
> instead of the cheaper mail order. My local Batteries Plus will typically
> have some warranty if I remember correctly. Moving forward I will only use
> 2 12v batteries and pre-charge them on a battery charger to equalize them
> before putting them in the 732A. I think the cheap batteries did not
> discharge equally, and would not recover when power was applied.
>
> Inspect the back plane for damaged traces and look at the capacitors. I had
> a few that looked questionable. So far, I have replaced all the big caps on
> the pre-regulator and regulator boards. My feeling is that once these go
> online, they should run as long as possible between repairs.
>
> The battery charger circuit may need adjusting. I tweaked mine and it
> seemed to work fine.
>
> Todd
>
>
> On Fri, Aug 22, 2014 at 10:42 PM, Randy Evans <randyevans2688 at gmail.com>
> wrote:
>
> > I received my Fluke 732A today.  Just powered it up but it needs new
> > batteries.  Any suggestions for sources (I haven't opened up the unit
> yet -
> > I want to make sure it works before doing that).  Also received the
> > ProLogix USB-GPIB adapter.  I plan on using Mark Sims' CAL ran data
> dumper
> > program to get the CAL data from my 3458A.  Should be a busy weekend.
> >
> > Randy
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