4. Phase measurement with wattmeter
This method is still used in conventional metrology, as it is very simple to use and requires standard equipment.
The assembly is shown in figure 24a.
The wattmeter W measures the active power P consumed by the load, while the ammeter I and voltmeter V measure the apparent power S = V I. The rectangular diagram of the three power vectors (figure 24b ) defines the power factor:
There are many complaints about this result: the devices' own consumption was neglected, the downstream circuit was used, which has its own systematic error, and the upstream...
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Phase measurement with wattmeter
Electrodynamic phasemeter
References
- (1) - HANSON (R.C) - Narrowband noise immunity in a broadband gain phase meter - (Immunité au bruit à bande étroite dans un phasemètre à large bande). Hewlett‐Packard J., 23, n° 9, p. 17-20, mai 1972.
- (2) - DART (R.) - Impédance mécanique et applications à l'étude dynamique des structures. - Spectral Dynamics. ...
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