[Test-Equipment] "Conductance" battery checker

[Raymond LaRue]

I believe the amount of "charge" left in the battery, is what is
measured. 




-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of J. Forster
Sent: Wednesday, March 16, 2011 11:52 AM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] "Conductance" battery checker

Do you mean they measure:

The amount of charge left in a battery (A-H)?
or
The internal resistance of a battery?

-John



> Looking for information on designing and building a battery 
> "conductance" tester.  In an extended web search, I see a couple 
> companies that sell small 6 and 12 volt conductance testers.
>
> They apparently inject a small AC voltage into a battery on or off 
> line, in a non-intrusive way.  Calibration data is developed by 
> profiles from testing good batteries.  The resultant voltage and 
> current phase differentials are processed and utilized to give an 
> indication of remaining battery capacity.
>
> The commercial testers available are not very expensive, but those 
> found on line give little detail about how they operate and they 
> appear not to quite meet my needs, as I would like to try this 
> technique by composite testing of a series of SLA batteries.
>
> I am prone to try building one if helpful info were available.
>
> Does anyone have any experience with such, or have design info for 
> building a battery conductance tester?
>
> Thank you for your attention.
> 73,
> Ray, W4BYG
> Cleveland, TN
>
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