Abstract
An electrometer circuit is described having high sensitivity, logarithmic response, negligible zero drift and requiring no "backing off." The two light beams are chopped at about 5 c/s and the 5 c/s output from the photocell amplifier is sampled by a simple photoelectric switch. Two cathode followers "memorize" the switch output between sampling intervals and provide on a microammeter a steady indication of the degree of unbalance of the two beams. The circuit is very simple to construct and maintain and does not require highly stabilized supplies.
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