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When you need to measure resistance down to a few micro ohms, this circuit works
great. It is powered from two "C" cell batteries and is designed to inject a well
regulated one amp of current into the unknown resistance. By measuring the voltage
drop across the resistor with a digital voltmeter, the resistance value can be
accurately measured. The circuit also is equipped with a low battery monitor. For
more details on this circuit, click here.
Published in Popular Electronics, November 1992
Click on Drawing Below to view PDF version of Schematic
