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1. The Volt - Ohm - Milliammeter
The ohmmeter circuitry of the VOM is nothing more than a simple milliammeter circuit with a variable (zero control) resistor (Rz) and test-lead connecting points (X and Y) to introduce a resistor of unknown value into the circuit.
http://www.fun-home-projects.com/electrical_projects/​tools/​the_volt_ohm_milliammeter.html

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