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Bill Jeffrey wrote:
Sjouke Burry wrote: Ha! That inside view is exactly the picture in my old study books showing a standard voltage reference. It might even still work. If you want to test, use a high quality voltmeter, and check its voltage. DONT let it deliver any current, because it becomes useless rather quickly. OK, I understand that putting it under any kind of load will produce an erroneous voltage. But if you do pull a few milliamps, is permanent damage done, or will it recover (however slowly)? In other words, what is the chemical reaction going on inside the cell? And how does it manage to continue to produce a VERY constant voltage (plus or minus a few microvolts!) for years and years, but will be damaged by pulling a couple milliamps out of it for a few seconds? Bill Jeffrey You should reduce current load to microamps, and for as short a time as possible. I dont know the chemical side of things, but it was customary to add a series resistance to the galvanometer to reduce load current to the unbalanced circuit until balance was almost achieved. Then the series resistor was shorted, and at he higher sensitivity the balancing act was futher improved. Milly_amps are definitely bad for the cell. Any digital multimeter of current age are oke to measure cell voltage. Almost all multimeters nowadays are several(10-200) megohms when measuring voltage. |
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