Instrument zeroing circuit

Details Instrument zeroing circuit Instrument zeroing circuit

1981-02-17

1983-02-15

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307359, 328175, 330 11, H03L 100

Patent

active

043743625

ABSTRACT:
An electronic interface circuit for coupling a source of analog signals to a measuring and/or recording device whereby the time varying component of the analog signal can be separated from any steady-state component, such as a DC bias, which may be present, allowing further signal processing on the time varying component only. The interface circuit comprises a servo control device having both a digital feedback loop and an analog feedback loop. Upon closure of a manually operable switch, a timer is initiated which first actuates the digital feedback loop wherein a digital number is generated which is proportional to the deviation of the signal output from a summing amplifier from a zero volt level. This digital number is applied through a digital-to-analog converter to the summing amplifier along with a second feedback signal obtained by sampling the output from the summing amplifier at a time subsequent to the digital correction operation. As a result, the deviation of the steady-state signal from zero occasioned by the inherent granularity in the analog-to-digital conversion process is eliminated.

REFERENCES:
patent: 3824481 (1974-07-01), Sponholz et al.
patent: 4193039 (1980-03-01), Massa et al.
patent: 4229703 (1980-10-01), Bustin

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