[volt-nuts] 732A and Prologix received

[acbern at gmx.de]

Randy,

I have replaced batteries in two units so far, which I bought on ebay (6V) and they fitted absolutelly perfect, no need to rework an metal and there was o isue with shortages. So there certainly are standard 6V batteries that fit without mods. I always try to keep things in original config, if possible.
Also, you do not want to adjust the 732a trimmers. It only gets unstable, if you are unlucky. I discussed this with some cal labs, same answer. What you could do is to adjust the jumper settings for coarse adjustment, if need be.
Adrian



> Gesendet: Samstag, 23. August 2014 um 04:03 Uhr
> Von: "Randy Evans" <randyevans2688 at gmail.com>
> An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Betreff: Re: [volt-nuts] 732A and Prologix received
>
> 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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