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noting the mention of using 00 copper as a shunt. The TC of copper is just over 1/3 % per degree C. I begged some Manganin from a metals supplier and made a couple of shunts to send to Paul. I have plenty of manganin, and if we can settle on a design, I will make up a dozen or so. Brass closet bolts like I used on the last one are really a last resort. I'll keep looking for copper bolts 1x 5/16 - 18.
Actually, the copper shunt may work in your favor. As it heats up, it will give a falsely high reading, at a time when the batteries want you to ease up anyway.
bob
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