Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration
Patent
1996-11-19
1999-08-03
Brown, Glenn W.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Calibration
324119, G01R 3500, G01R 1922
Patent
active
059330139
ABSTRACT:
A calibration circuit of an AC/DC converter which measures an AC voltage by converting the AC voltage to a DC voltage. The AC/DC converter measures the AC voltage with high accuracy with low cost by having a calibration circuit to correct the frequency response characteristic involved in an AC/DC conversion process. The AC/DC converter includes a signal generator for generating at least two calibration signals having the same energy level and different frequency spectrums, a switch for selecting the input signal to be measured or one of the calibration signals from the signal generator, an amplifier for amplifying the selected signal from the switch wherein the amplifier has a circuit arrangement for adjusting a frequency characteristic thereof, and an AC/DC conversion circuit for converting an AC voltage from the amplifier to a corresponding DC voltage.
REFERENCES:
patent: 3600675 (1971-08-01), Grenier
patent: 4061891 (1977-12-01), Pommer
patent: 5138267 (1992-08-01), Komagata et al.
patent: 5172064 (1992-12-01), Walls
patent: 5621329 (1997-04-01), Tsao et al.
Advantest Corp.
Brown Glenn W.
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