Electricity: measuring and testing – Electrical speed measuring
Patent
1987-05-29
1989-09-12
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
324538, 324503, 340652, G01P 300, G01R 3104
Patent
active
048663760
ABSTRACT:
An apparatus for testing a cross-coil instrument having a pointer, a sensor for sensing a condition to produce a sensor signal indicative of the sensed condition, and a converter coupled to the sensor for converting the sensor signal to a deflection of the pointer. The apparatus comprises a fault detector coupled to the sensor for detecting a disconnection fault to produce a command signal, and a test signal generator responsive to the command signal for generating a predetermined test signal to the converter, thereby moving the pointer to a predetermined position. The operation accuracy of the cross-coil instrument may be checked from the difference between the actual and predetermined pointer positions when a connector provided in a signal line between the sensor and the fault detector is pulled out.
REFERENCES:
patent: 3680923 (1972-08-01), Peterson et al.
patent: 4098542 (1978-07-01), Rajput et al.
patent: 4309585 (1982-01-01), Doi et al.
patent: 4425622 (1984-01-01), Arikawa
patent: 4553093 (1985-11-01), Chikasue
patent: 4638399 (1987-01-01), Maroney et al.
Fujiki Norio
Hayashi Takatoshi
Ishikawa Masahiro
Kawagishi Masao
Eisenzopf Reinhard J.
Harvey Jack B.
Nissan Motor Company Limited
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