Erisageduslainemõõtur omab muutuva sagedusega ostsillaatorit sissetuleva lainele eelnevalt kindlaksmääratud lööksageduse andmiseks, mis võimaldab mõõta nii sissetuleva laine kui ka saabuva laine sagedust.
In the heterodyne wavemeter, a variable-frequency local oscillator is adjusted to give a predetermined beat frequency with the incoming wave, enabling the frequency of the incoming wave to be determined.
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