Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
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.
Gaffin Jeffrey A.
Paschall M. H.
Tandem Computers Inc.
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