DC_AMMETER_I

Published:2009/7/16 3:01:00 Author:Jessie | From:SeekIC

For dc readings higher than 100μA, the inverting amplifier configuration shown in the figure provides the required gain. Resistor RA develops a voltage drop in response to input current IA, This voltage is amplified by a factor equal to the ratio of RF/RB, RB must be sufficiently larger than RA, so as not to load the input signal. The figure also shows the proper values of RA, RB, and Rf for full-scale Deter deflections from 1 mA to 10 A.



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