| 摘要 |
A frequency monitor for giving a meter indication of the frequency of a signal utilizes a zero-crossing detector to control the counting of clock pulses to a pair of cascaded binary counters. The first counter covers the bulk of the period between zero crossings and the second counter covers the remainder thereof. The count in the second counter is periodically stored and fed to a digital-to-analog converter which includes means for performing an analog linearization of currents which energize a meter; such meter being calibrated in Hertz per unit current.
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