THE OHMMETER


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THE OHMMETER
THE OHMMETERThe ohmmeter, as its name implies, is an instrument for measuring resistance. To make the meter movement capable of measuring resistance directly, it is necessary merely to provide a source of electric power and a suitable resistance. Remember, the test instrument responds only to current through the meter's coil; but since current is a function of a circuit resistance, a galvanometer can be used as an ohmmeter, as long as power is supplied to the circuit.Figure 8-16 is a schematic diagram of a simple ohmmeter circuit. The principle of operation follows Ohm's law, and a 3-V battery (two 1.5-V AA cells in series) provides the power necessary for operation. The…
Citation
Thomas K. Eismin: Aircraft Electricity and Electronics, Sixth Edition. THE OHMMETER, Chapter (McGraw-Hill Professional, 2014), AccessEngineering Export