At 02:19 AM 4/7/2004 -0500, Eric Christensen wrote:

>I am building a battery testing device that will run long-term (1-2 year)
>tests on different types of batteries.  This device has a few resistors in the
>battery discharge part of the circuit that I would like to be as 'ideal' as
>possible.  The resistors will see currents from 5 amps (the low ohm ones) to a
>single uA (the high ohm ones).
>
>Does anybody have any info about the various types of resistors.  I need to
>know things such as the capacitance, inductance, etc... as well as the
>stability over time.

Why not use one or more constant current sinks?
They can be made to be programmable, or just two-terminal devices.

This is what I used for my battery project at:
http://www.dvanhorn.org/NIMH/Index.php

The graphs are about halfway down, links in the text.

A CCS dosen't exactly act like a resistor, but it's easier to figure amp-hours and Joules, if you aren't constantly measuring.

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