Frequency meter for use with Geiger-Muller counter
L. F. Curtiss, Blain Brown · Journal of research of the National Bureau of Standards · 1945
An improved circuit is described for reading the rate of pulses from a Geiger-Milller counter.lBased on t he usual procedure of leveling and rectifying the pulses to charge a condenser, the improvements concern a bridge-type vacuumtube voltmeter to read the voltage on the condenser and an arrangement to compensate parasitic potentials developed in the rectifier for the pulses.An adequate source of potentials from one small transformer is described, which renders the circuit useful in portable instuments.Particular care has been taken to design a circuit that is independent of the voltage of the alternating-current mains from which the circuit is operated.A modification of the circuit for rapidly decaying sources is also described.