Error correction system for digital length or angle measuring in

Details Error correction system for digital length or angle measuring in Error correction system for digital length or angle measuring in

1983-01-20

1986-10-21

Krass, Errol A.

Boots, shoes, and leggings

73 1R, 364571, G06F 1536, G06G 718

Patent

active

046189408

ABSTRACT:
A digital electronic length or angle measuring instrument includes an arrangement for error correction. A signal generator delivers periodic analog reference signals R.sub.S1, R.sub.S2 which are compared in a comparator with scanning signals S.sub.1, S.sub.2 generated by the measuring instrument. In accordance with the result of the comparison in the comparator, the reference signals R.sub.S1, R.sub.S2 are altered as a function of correction data for symmetry, amplitude ratio, phase angle, and signal form, which correction data are determined in a correction component and are supplied to setting members included in the signal generator. In this way, an in dependence on the correction data, improved reference signals are generated which then form a basis for the next comparison in the comparator.

REFERENCES:
patent: 4144578 (1979-03-01), Mueller et al.
patent: 4225931 (1980-09-01), Schwefel
patent: 4253155 (1981-02-01), Freiday et al.
patent: 4295201 (1981-10-01), Wiklund
patent: 4418392 (1983-11-01), Hata
patent: 4424700 (1984-01-01), Erickson et al.
patent: 4442696 (1984-04-01), Erickson et al.

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