[Test-Equipment] "Conductance" battery checker

[Raymond LaRue]

Bob,
Thanks for the response. 

You may be right, but the information on the Midtronics Power Secure 6/12 seems to indicate a "percentage" of charge remaining.  

I had one here from the local Interstate Batteries office last week.  It displayed xx% of "reference".  The "reference" (therefore I assume full charge), is developed by testing several good batteries first. 

How they obtain and interpolate that is one of the major questions I have. 
Ray



-----Original Message-----
From: rbethman [mailto:rbethman at comcast.net] 
Sent: Wednesday, March 16, 2011 12:25 PM
To: Discussion of Electronic Test Equipment
Cc: Raymond LaRue; jfor at quik.com
Subject: Re: [Test-Equipment] "Conductance" battery checker

"Normally" battery conductance is a measurement of the battery's internal resistance.  NOT the remaining charge.

Bob - N0DGN

On 3/16/2011 12:06 PM, Raymond LaRue wrote:
> 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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