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1 AMP CURRENT INJECTOR
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