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4.7 Frequency & Phase Measurement
Frequency measurement
· Frequency is measured in hertz (Hz) which is equal to one event per second.
· The period is the duration of time of one cycle in a repeating event, so period is the reciprocal of the frequency.
· To measure the frequency of a signal, the waveform must be displayed such that complete cycle is displayed on the CRT to improve its accuracy.
Example of frequency calculation:
Phase measurement
· The phase of a periodic electrical waveform describes a specific position at a point in time.
· The phase of a waveform is periodic and a complete cycle of the waveform is defined as having 360ᵒ or 2π radians of phase.
· Phase difference, or phase angle, is the difference in phase between two phase points, usually on two different waveforms with the same frequency.
Phase difference between 2 waveforms is calculated as:
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