Pulse length indicator

Details Pulse length indicator Pulse length indicator

1986-09-26

1988-09-06

Paschall, M. H.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

340659, 340662, G01P 348

Patent

active

047695951

ABSTRACT:
A pulse length indicator, for signaling when the length of a pulse from a cyclic signal source has exceeded a chosen duration, has a ramp signal generator, coupled to the cyclic signal source, which produces a ramp signal. The level of the ramp signal is dependent upon the duration of either of the high and low levels of the cyclic signal. The ramp signal is fed to a level sensitive switch which couples an indicator, typically an LED, to a power source. When the level of the ramp signal is sufficiently long or short, the switch closes to actuate the indicator. The ramp signal generator can be a simple R-C circuit with the signal source being AC or DC coupled to the switch.

REFERENCES:
patent: 3585477 (1971-06-01), Shacknow
patent: 3781677 (1973-12-01), Hagen
patent: 4100459 (1978-07-01), Nakamura et al.
patent: 4543566 (1985-09-01), Buck et al.

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