HIGH_RESISTANCE_MEASURING_DMM

Published:2009/7/10 4:09:00 Author:May | From:SeekIC

Using a simple technique, you can extend the resistance-measurement range of your 31/2-digit DMM from the usual 19.99 MΩ to 40 GΩ. You could measure, for example, the leakage resis-tances of transformers, motor windings, and capacitors. For a 19.99-MΩ DMM range, select a stable 20-MΩ resistor whose value is slightly below nomi-nal, 19.99 MΩ for example. An unknown high resistance, RX,is: where Rp is the high-value parallel resistor and RpX is the measured value of Rp in parallel with RX. An even easier way to determine the value of Rx is to use the graph.



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