Method and circuit for transforming a stored quantity of electricity into a number of electric pulses proportional to this quantity

摘要

751,259. Pulse metering. EBAUCHES SOC. ANON. March 23, 1954 [April 1, 1953], No. 8398/64. Class 37. [Also in Group XL (c)] Apparatus for counting pulses at a random rate comprises a one- or two-stable state arrangement of two valves which is converted to a multivibrator arrangement by the received pulses to transmit pulses at regular intervals equal in number to the received random pulses. In one embodiment (Fig. 1) two valves T1, T2 have their anodes and grids cross-connected to produce a two-stable state with either one or the other valve conducting. The grids are connected through resistors to the anode V2 of a third valve TC, so that when a positive potential appears at V2 it causes the non-conducting valve T1 (or T2) to conduct, producing a negative pulse via C1 (or C2) to cut off the other valve, until the condenser charges sufficiently to release the first valve, and the two valves continue as a multivibrator for the duration of the positive potential on V2. In the application shown, to count random positive pulses received on the grid of a further valve T normally biased to cut-off, each received pulses causes a negative surge to appear on the grid of valve TC and a corresponding positive surge on the anode V2, the circuit components being such that the duration of the positive surge on the anode V2 produces one change in the condition of valves T1, T2. The receipt of further positive pulses by valve T produces further negative surges which are stored by condenser C which discharges at a linear rate, so that the pulses transmitted by valves T1, T2 at the multivibrator frequency is equal to the number of pulses received by valve T at a random rate. In a modification (Fig. 2, not shown) the valves T1, T2 are connected in flip-flop manner, having only one stable condition, and the advent of a positive potential on anode V2 of valve TC causes one change-over for each positive pulse received by valve T.