Time-period comparing device

Details Time-period comparing device Time-period comparing device

1979-05-18

1981-09-15

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92CA, 235 92FQ, 235 92PE, H03K 2130, G06M 302

Patent

active

042899567

ABSTRACT:
A time-period comparing device for use in, for example, monitoring the rotational velocity of a fan. The device compares the time-period of an input signal with a reference signal. The device includes a reference oscillator, a reference period counter for generating the reference signal and a time-period comparator for comparing the input signal with the reference signal. The device also includes means for preventing the device from operating when the input signal is an irregular signal and means for stopping this device from operating for a definite interval after the power is turned on.

REFERENCES:
patent: 3714645 (1973-01-01), Siverton
patent: 3843871 (1974-10-01), Fujimaki et al.
patent: 3906346 (1975-09-01), Hunter
patent: 3981440 (1976-09-01), Richardson
patent: 4052676 (1977-10-01), Crittenden

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