Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1986-08-25
1987-10-13
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83D, 324 74, G01R 2500
Patent
active
047001291
ABSTRACT:
In a phase measurement apparatus having a phase detector for receiving a first frequency signal from a variable frequency signal generator and a second frequency signal from the generator through a calibration member having good linear frequency vs. phase characteristics and for detecting the input signals and outputting a phase difference signal, the apparatus further includes a first phase ratio operation section for changing an output frequency of the generator, receiving phase difference signals at frequencies as integer multiples of a phase difference of 2, and calculating a first frequency vs. phase difference ratio for the calibration member a second phase ratio operation section for changing the output frequency of the generator in a relatively narrow frequency range, receiving phase difference signals at upper and lower limit frequencies of the frequency range, and calculating a second frequency vs. phase difference ratio and a calibration section for comparing the first and second frequencies vs. phase difference ratios, increasing the gain of a variable gain amplifier for amplifying the phase difference signal when the second frequency vs. phase difference ratio is smaller than the first frequency vs. phase difference ratio, and decreasing the gain of the variable gain amplifier when the second frequency vs. phase difference ratio is larger than the first frequency vs. phase difference ratio.
REFERENCES:
patent: 4327441 (1982-04-01), Bradshaw
patent: 4420747 (1983-12-01), Kistner
patent: 4578705 (1986-03-01), Elmis et al.
patent: 4634967 (1987-01-01), Virieux et al.
patent: 4636719 (1987-01-01), Zuk et al.
Saito Goro
Yoshizawa Shigemichi
Anritsu Corporation
Tokar Michael J.
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