US PATENT SUBCLASS 331 / 44
WITH FREQUENCY CALIBRATION OR TESTING


Current as of: June, 1999
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331 /   HD   OSCILLATORS

44WITH FREQUENCY CALIBRATION OR TESTING


DEFINITION

Classification: 331/44

(under the class definition) Subject matter (1) wherein means are provided to adjust the frequency setting means of the oscillator to make its frequency of oscillation correspond to the frequency (or fundamental, harmonic or sub-harmonic) of a source of standard frequencies or (2) means are provided wherein the frequency of the oscillations generated by the oscillator is compared with the frequency of the oscillations of a source of standard frequencies and the tuning position indicator or dial of the oscillator is graduated or marked in accordance with the results of the comparison with the known frequency setting or settings of the source of standard frequencies or (3) wherein means are provided to determine a performance characteristic, or characteristics, of the oscillator under prescribed conditions of operation (e.g., test under particular duty cycle, test under various load conditions, test purity of generated wave form, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

64, for oscillators with indicator, signal, or alarm in general and wherein frequency calibration of the oscillator with respect to a source of standard frequency or test of some other characteristic of the oscillator are not involved.

SEE OR SEARCH CLASS

250, Radiant Energy,

250, for radio or microwave absorption wavemeters for determining the frequency or wavelength of a radio or microwave. 324, Electricity: Measuring and Testing,

20+, for systems for testing lamps and space discharge devices in general, particularly subclasses 24+ for testing the discharge characteristics of space discharge devices (e.g., such as triodes and pentodes), subclasses 57+ for measuring or testing electrical apparatus wherein no details of the apparatus are claimed, subclasses 76.12+ for systems to analyze complex electrical waves, and subclasses 76.39+ for systems for measuring the frequency of cyclic current or voltage.