[NJARC] Old Battery Question

[Scott Roberts]

Ok, Review time here- I rechecked the batteries mentioned previously. I had checked them with my fancy "True RMS" DMM, and got those readings. My "TRMS DMM" and I do not get along. I rechecked them with an analog MM, and they showed much less voltage. So I took one apart- nicely, too. I found the construction along the lines I imagined, and am pretty sure I can cobble two together very easily.

I am still interested in comments-
Thanks!
Scott


--- On Thu, 11/27/08, Scott Roberts <ng19delta at yahoo.com> wrote:

> From: Scott Roberts <ng19delta at yahoo.com>
> Subject: [NJARC] Old Battery Question
> To: "NJARC Radio Club" <njarc at mailman.qth.net>
> Date: Thursday, November 27, 2008, 2:16 AM
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Ok, battery guru types, here is a question for you- I just
> received a Weston 665 (I-56-A)set analyzer, and discovered
> it uses two Burgess 7 1/2 volt batteries, #5540, and
> arranged with 5 terminals, labelled "+", "-1
> 1/2", -3", "-4 1/2", and "-6".
> The batteries both state "Install Before May
> 1965", and are in really great looking shape! The neat
> thing is, they also both have about a 75% charge each!
> 
> Now, 75% is nice, but I am sure readings will suffer for
> it. I could probably adapt a 1.5 "AA" cell in line
> for each, to bring required voltages in line, but I was
> thinking of a long term solution: Can I put together two
> sets of batteries, each of 5 cells in series, and tap off
> them at the required locations, as it appears is the
> original construction here? Or is there more I need to know?
> I mean, if I link the 5 cells in series, and have one
> providing the positive terminal, if I go over two cells(from
> the positive), will I get -3VDC, and if I go over 4, will I
> get -6VDC? I may try some experimenting here, but I think it
> may work.
> 
> Comments?
> 
> I am hoping to use this set to analyze the BC-348P which is
> trying to drive me nuts... I actually have the proper manual
> for the analyzer set, and can extrapolate how to set it up
> for my particular needs...
> 
> Thanks!
> Scott
> 
> 
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