Re: Need quick response, please

["Joe Smalley" <joes@worldfront.com>]

Using a load resistor will cause a slight problem with measurements because
the voltage will be dropping during the load test. If you wait long enough
for the voltage to stabilize, you will be there for hours testing all those
batteries.

It is most expeditious to use the open circuit voltage as an indicator.

Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
joes@worldfront.com


----- Original Message -----
From: "Victor Tikhonov" <vtikhono@lsil.com>
To: "ev" <ev@listproc.sjsu.edu>
Sent: Thursday, May 31, 2001 12:13 PM
Subject: Need quick response, please


> Hello list,
>
> I will have to pick up 28 YT optimas tomorrow at 8:00am
> and the supplier allowed me to go through the batch of 260
> delivered batteries to pick out most identical ones.
>
> Other than picking obvious the same date code, I'm allowed
> to use DVM to measure voltages. The problem is, I can't
> use a load tester because terminals are capped (I can still
> touch base of terminals to measure voltage though) and
> I can't touch the caps (or batteries can't be sold as new).
>
> My question is - does it make sense to at least put small
> load (resistor between the leads) so when I touch and measure
> volts, ~some~ current will flow. Would this be significantly
> more accurate to pick the batteries with identical voltages
> while loaded with even small (30 Ohm...50 Ohm) resistor
> vs. just gauging open clamp voltage?
>
> 30 Ohm will produce about 12.6/30=420mA. I could use
> lower value resistor, but the result may start getting skewed
> depending on how hard I press the test lead against the
> terminal posts.
>
> Any suggestions before end of the day are appreciated.
>
> Thanks in advance,
>
> Victor
>
>