Cab signal test set for automatically testing the pickup coils a

Details Cab signal test set for automatically testing the pickup coils a Cab signal test set for automatically testing the pickup coils a

1981-03-31

1984-03-13

Strecker, Gerard R.

Electricity: measuring and testing

Plural, automatically sequential tests

340514, 371 15, G01R 1512, G08B 2900

Patent

active

044370563

ABSTRACT:
An automatic electronic cab signal test set for testing the integrity of a pair of pickup coils and for checking the sensitivity of the amplifier of the cab signal receiver. A mode selector is connected to a clock oscillator which produces clock pulses. The clock pulses are connected to an up/down binary counter which sequentially counts up from zero to a maximum count and then sequentially counts down from the maximum count to zero. The up/down binary counter is connected to a code selector which changes the time constant of an R-C network of a code oscillator. The code oscillator illuminates an idication when the cab signal receiver is under test and modulates the carrier signal of a carrier oscillator. The modulated carrier signal is fed to the input of a constant current source which has its output directly connected to the pickup coils and the amplifier of the cab signal receiver. A low-high switch conditions and powers the test set which goes through a simulated low rail current speed command sequence and then goes through a simulated high rail current speed command sequence.

REFERENCES:
patent: 2595518 (1952-05-01), Gassett
patent: 4055801 (1977-10-01), Pike et al.
patent: 4109199 (1978-08-01), Ball et al.

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