Test apparatus for digital photoelectric length or angle measuri

Details Test apparatus for digital photoelectric length or angle measuri Test apparatus for digital photoelectric length or angle measuri

1981-03-18

1984-01-03

Punter, William H.

Optics: measuring and testing

By polarized light examination

With light attenuation

250214R, 250231SE, 356243, 356395, G01B 1100, G01D 1800

Patent

active

044239580

ABSTRACT:
A digital photoelectric angle or length measuring instrument, of the type having a scale with at least one division, a scanning unit for scanning the division to generate a scanning signal, and an evaluating unit having a trigger circuit for evaluating the scanning signal, is provided with means for generating at least one test signal and means for selectively applying the test signal either to the trigger circuit or to a light source such that the trigger threshold of the trigger circuit is temporarily varied by a selected amount, thereby providing a simple, reliable check of the trigger threshold of the trigger circuit, without requiring external equipment or disassembly of the measuring instrument.

REFERENCES:
patent: 2791696 (1957-05-01), Schell
patent: 2812445 (1957-11-01), Anderson
patent: 2994783 (1961-08-01), Looschen
patent: 3808431 (1974-04-01), Hedrick
patent: 4330831 (1982-05-01), Schwefel

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