US PATENT SUBCLASS 324 / 76.52
.~.~ By phase comparison

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

76.11  DF  MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46}
76.39  DF  .~ Frequency of cyclic current or voltage (e.g., cyclic counting etc.) {6}
76.52.~.~ By phase comparison {10}
76.53  DF  .~.~.~> With phase lock
76.54  DF  .~.~.~> With delay line
76.55  DF  .~.~.~> Digital output {7}
76.66  DF  .~.~.~> With capacitive energy storage {1}
76.68  DF  .~.~.~> With filtering
76.69  DF  .~.~.~> Current output proportional to frequency
76.71  DF  .~.~.~> Nulling circuit
76.72  DF  .~.~.~> Qualitative output
76.73  DF  .~.~.~> With saturable device
76.74  DF  .~.~.~> Deviation measurement

DEFINITION

Classification: 324/76.52

By phase comparison:

(under subclass 76.39) Subject matter having angle relationship means as a part thereof, in order to perform the frequency measurement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

76.77+, for the phase comparison means, per se.