METHOD AND APPARATUS FOR ELIMINATING COUNT SCATTER INTRODUCED BY PHASE-LOCKED LOOP FREQUENCY MULTIPLIERS

摘要

A frequency measuring system for use, for example, in an atomic resonance magnetometer device, comprising a phase-locked loop multiplier system to which the incoming AC signal is delivered including a voltage controlled oscillator having an operating frequency at a multiple of the frequency of the incoming signal, counter means being employed to count the cycles of the VCO signal output as a measure of the frequency of the incoming signal, the means for transmitting the VCO output signal to said counter means being synchronized with said incoming frequency signal to insure that the count is initiated at a predetermined point during the cycle of the incoming frequency signal.