Scanning apparatus employing filter capacitor havcing short charge-time and long, but with means to reduce, discharge-time

摘要

897,946. Measuring electrically. BAILEY METER CO. May 11, 1960 [May 13, 1959], No. 16700/60. Class 40 (1). In a system in which a plurality of transmitters 10, 12, 14 and 16, each producing A.C. signals, are sequentially connected, via relays 32, 34, 36 and 38, to a single full wave rectifier, 24, and filter circuit, the output of the filter circuit is clamped to zero between successive samples by switching on the normally biased off transistor 30 by means of a pulse derived from the oscillator controlling the sequence switching, in order to remove from the filter output any remaining signal due to the previous sample.