How is a frequency counter used?
To provide reference points on an analog receiver dial thereby aiding in the alignment of the receiver.
To heterodyne the frequency being measured with a known variable frequency oscillator until zero beat is achieved, thereby indicating the unknown frequency.
To measure the deviation in an FM transmitter in order to determine the percentage of modulation.
To measure the time between events , or the frequency, which is the reciprocal of the time .
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