[Test-Equipment] "Conductance" battery checker

[J. Forster]

The "reference" could be either charge or internal resistance. I'm
inclined to think the latter. Conductance is the inverse of Resistance.

Think of it as like the ESR of a capacitor.

-John

============


> 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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