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Patent
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G01R 23/10 (2006.01) G01R 23/00 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1131704
SELF CALIBRATING CRYSTAL CONTROLLED FREQUENCY COUNTER METHOD AND APPARATUS Abstract of the Disclosure A method and apparatus for obtaining an accurate measure of the frequency of an applied signal by generating a pair of independent frequency signals wherein one of the independent frequency signals has a frequency value which is indicative of the operating temperature of the counter. The counter has two modes of operation: a calibration mode and a measurement mode. In the measurement mode an unknown signal is applied to the counter, its frequency value is measured against the other of the independent frequency signals, the value of the one of the independent frequency signals is utilized as a pointer to the necessary correc- tion factor at the then operating temperature of the counter, the measured frequency value is corrected alge- braically with this correction factor, and the final result outputted for further use by the user.
336984
Hewlett-Packard Company
Sim & Mcburney
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