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Old Jun 18, 2003, 03:01 AM
Rick Page
Rick Page
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RE: [EFLT] Robbe IR Meter - was: Internal resistance

This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

>The Robbe meter measures the AC Impedance, NOT the internal resistance.

AC is the standard measurement though. Theoretically, the DC resistance is
easier since we just have to measure the voltage at 2 different loads.
http://www.buchmann.ca/Chap9-page2.asp
For M/E Calc, the AC Impedance is too low, but as has been pointed out, the
DC internal resistance is usually linearly related. Many of our battery
chargers calculate resistance to adjust the current during an automatic
charge (similar to the Cadex discreet method), but they don't report the
value.
In subsequent pages of the Buchmann chapter (above) he discusses the 2
measurements and the "memory effect" of crystal formation. This
crystallisation never occurs with flight batteries with our aggressive
charge and discharge cycles.

Rick.


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