Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonlinear
Patent
1974-09-04
1976-07-27
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonlinear
324119, 328145, G01R 1510, G01R 1922
Patent
active
039719847
ABSTRACT:
The disclosed circuit provides a wideband, wide-range logarithmic responding voltmeter particularly suitable for use as a transducer analyzer. The circuit includes an input for receiving a given A.C. input signal which can vary within a 100 db dynamic range. The input signal is coupled to a buffer amplifier the output of which is capacitively coupled to a logarithmic converter. The converter includes an operational amplifier and provides an A.C. output signal which is proportional to the logarithm of its A.C. input signal. The open loop gain of the operational amplifier is utilized to provide the A.C. output signal. The output signal of the converter is capacitively coupled to a precision AC/DC converter which rectifies and filters the output signal to provide a D.C. output voltage the level of which is, therefore, also proportional to the logarithm of the given A.C. input signal within its 100 db range. The D.C. output voltage is coupled to utilization means such as a logarithmically calibrated chart recorder or meter. The precision AD/DC converter also includes a zero-adjustment for nulling any offsets in its circuit and any residual noise at the output of the logarithmic converter. Accordingly, with no input signal applied to the disclosed circuit the output recorder and/or meter stably read exactly zero ("0").
REFERENCES:
patent: 3392287 (1968-07-01), McFadyen et al.
patent: 3479593 (1969-11-01), Dissing et al.
patent: 3499160 (1970-03-01), Gordon
patent: 3500198 (1970-03-01), Kaiser et al.
patent: 3683275 (1972-08-01), Fowler
patent: 3727129 (1973-04-01), Hummert
B-Cubed Engineering, Inc.
Karlsen Ernest F.
Michals William J.
Rolinec R. V.
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