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US 4,306,297 AGranted
Apparatus for measuring the vector voltage ratio of two A.C. signals
AssigneeHewlett-Packard Company
InventorsNoriyuki Sugihara, Takashi Yoshida
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Abstract
An apparatus is disclosed for determining the vector voltage ratio of two a.c. input signals. A synchronous rectifying circuit, a phase shifter and a voltmeter are employed to detect the in-phase and orthogonal components of the input signals relative to a reference signal. A calculation section determines the vector voltage ratio from the values of these components.
Claims4
An apparatus for measuring the vector voltage ratio of two a.c. signals, said apparatus comprising:
- input means selectively coupled either to a first input terminal to enter a first input signal or to a second input terminal to enter a second input signal;
- a phase shifter coupled to the first input terminal;
- a synchronous rectifying circuit coupled to the phase shifter and to the first input terminal to provide a rectified signal;
- a voltmeter coupled to the synchronous rectifying circuit to measure the d.c. component of the rectified signal;
- calculating means coupled to the voltmeter for determining the vector voltage ratio of the second input signal to the first input signal;
- and
- control means coupled to the phase shifter, to the input means and to the voltmeter for regulating the steps involved in the determination of the vector voltage ratio.
4 more elements
Dependencies are inferred from the claim text.