Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration
Patent
1991-10-16
1994-02-15
Tokar, Michael J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Calibration
324130, 307351, G01R 3500
Patent
active
052870634
ABSTRACT:
An automatic calibration circuit for a maximum and minimum value detection apparatus including a maximum value detection circuit for detecting and outputting a maximum value of an input signal, and a minimum value detection circuit for detecting and outputting a minimum value of the input signal. In a calibration mode, a reference signal of a fixed value is automatically inputted to the maximum value detection circuit and to the minimum value detection circuit upon entry of a calibration mode. An offset voltage of at least one of the maximum value detection circuit and the minimum value detection circuit is automatically adjusted so that the maximum value and the minimum value obtained in response to the reference signal become equal.
REFERENCES:
patent: 3820033 (1974-06-01), Iwata
patent: 3982241 (1976-09-01), Lipcon
patent: 3984772 (1976-10-01), Bohler et al.
patent: 4069452 (1978-01-01), Conway et al.
patent: 4213085 (1980-07-01), Ramer
patent: 4779039 (1988-10-01), Baker
patent: 4806848 (1989-02-01), Demers
Brown Glenn W.
Kikusui Electronics Corporation
Tokar Michael J.
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