Abstract
A frequency measurement method based on signal delay detection is presented. The method adopts multi-path same delay line to generate multi-path delayed signal whose period is almost the same with that of the reference signal, the average delay time of two adjacent signals that are detected is selected as the interval between the reference signal's rising edge and gate's opening and closing time to calculate the frequency of the measured signal. Error analysis and measurement uncertainty evaluation show that the precision of measurement of the method is determined by the delay time. Experimental data verify that the method could ensure testing speed while effectively reduce the error of ± 1 count.
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