Hurll, John Measurements Standards Laboratory, Marconi Instruments Ltd., Stevenage, Hertfordshire, United Kingdom.
- Three-voltmeter method
- Zero-crossing-detector phase meter
- FFT phase meter
- Crossed-coil phase meter
- Oscilloscope methods
- Phase-order indicators
- Phase-relation indicators
- High-frequency measurement
- Phase-angle generation techniques
- Links to Primary Literature
- Additional Readings
Measurement of the time delay between two periodic signals. The phase difference between two sinusoidal waveforms that have the same frequency and are free of a dc component can be conveniently described as shown in Fig. 1. It can be seen that the phase angle can be considered as a measure of the time delay between two periodic signals expressed as a fraction of the wave period. This fraction is normally expressed in units of angle, with a full cycle corresponding to 360°. For example, in Fig. 1, where the voltage v1 passes through zero ⅛ cycle before a second voltage v2, it leads by 360°/8 or 45°. Phase angle is usually defined from the fundamental component of each waveform; therefore distortion of either or both signals can give rise to errors, the extent of which depends on the nature of the distortion and the method of measurement. See also: Distortion (electronic circuits)
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