Two_cell_voltmeter_with_high_input_resistance

Published:2009/7/24 3:18:00 Author:Jessie | From:SeekIC

This two-cell voltmeter has an input resistance in excess of 1,000,000 MΩ. Full-scale deflection is ±500 mV, ±150 mV, and ±15 mV. Higher voltage ranges can be added with external input-voltage attenuator networks. The meter is in series with the gain network, thus eliminating the meter temperature-coefficient error term. Standby supply current (meter not deflected) is 300 μA. At full-scale deflection, current rises to 800 μA. Carbon-zinc battery life should be in excess of 1000 hours.



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