Automatic departure test unit for cab signal equipment

Details Automatic departure test unit for cab signal equipment Automatic departure test unit for cab signal equipment

1981-03-31

1984-08-21

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

246 28F, G01R 3102, B61L 2100

Patent

active

044672705

ABSTRACT:
An automatic car carried departure test unit including an integrated circuit code oscillator for generating coded signals and an integrated circuit carrier oscillator for producing a carrier signal which is modulated by the coded signal to produce coded carrier signals. The coded carrier signals drive a current source which directly injects current signals into a pair of series aiding pick-up coils for testing the reception of coded speed command signals by the pick-up coils and the amplifier of the cab signal receiver. An integrated circuit speed oscillator produces simulated speed signals which are logically processed in sequential order to verify the operation of the overspeed functions of the automatic train protection equipment.

REFERENCES:
patent: 2719912 (1955-10-01), Maenpaa
patent: 2738416 (1956-03-01), Ihrig
patent: 3390256 (1968-06-01), Clanton
patent: 3991403 (1976-11-01), Olsson
patent: 4053879 (1977-10-01), Anderson
patent: 4228537 (1980-10-01), Henckels
patent: 4314234 (1982-02-01), Darrow
patent: 4361301 (1982-11-01), Rush

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