Method and apparatus for active temperature compensation in a ra

Details Method and apparatus for active temperature compensation in a ra Method and apparatus for active temperature compensation in a ra

1995-04-20

1996-05-21

Swarthout, Brent A.

Communications: electrical

Continuously variable indicating

With meter reading

34087017, 34087005, 34087004, 455 71, 455113, G08B 2300

Patent

active

055193889

ABSTRACT:
A method and apparatus for producing a temperature stabilized frequency from a signal generator in a monitoring station is described. The signal generator monitors the voltage response of an RC circuit where the resistive portion is formed by a thermistor, to produce a time-dependent signal. A comparator compares the time-dependent signal to a reference voltage to determine a rise time of the voltage across the capacitor. Based upon a software timer loop, the signal generator determines a temperature range by selecting data from a look-up table based upon the rise time of the RC circuit.

REFERENCES:
patent: 3805256 (1974-04-01), Pepin
patent: 4395776 (1983-07-01), Naito et al.
patent: 4614945 (1986-09-01), Brunius et al.
patent: 5208835 (1993-05-01), Weeks et al.

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