Automatic drift correction

Details Automatic drift correction Automatic drift correction

1983-12-01

1984-07-31

Anagnos, Larry N.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307353, 307517, 328147, 330 9, H03K 524

Patent

active

044632720

ABSTRACT:
Drift in the zero or datum reference point of a circuit (such as that forming part of a measuring device) is corrected by sensing the rate of change of the signal provided by the circuit and distinguishing between a rate of change characteristic of that due to a valid signal indicative of a measurement and a rate of change characteristic of that due to drift in the circuit.
In one embodiment, a window comparator 18 senses the rate of change of the signal output from circuit 10 by periodically sampling in sample/ hold 16 and then comparing with the current value of the signal. A signal circulating path 20, 21, 22 holds a drift compensating value which is updated when comparator 18 senses a rate of change below a threshold value which is indicative of drift in circuit 10. The drift compensating value is added to the signal from circuit 10 in summing amplifier 15 thereby correcting the signal for drift.

REFERENCES:
patent: 3584309 (1971-06-01), Nicolson
patent: 3654560 (1972-04-01), Cath et al.
patent: 3784919 (1974-01-01), Azegami
patent: 4055777 (1977-10-01), Black
patent: 4297642 (1981-10-01), Baldwin et al.
patent: 4309663 (1982-01-01), Bout et al.

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