HARMONIC FACTOR TESTING APPARATUS FOR INTELLIGENCE-POWER TELEPHONE

The utility model relates to an intellectualized harmonic factor testing apparatus for electrically powered telephone, which is a multifunctional intellectualized apparatus controlled by a microcomputer. The utility model is composed of a microcomputer, a telephone harmonic factor testing apparatus,...

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Bibliographic Details
Main Author WU NAILING
Format Patent
LanguageEnglish
Published 30.12.1992
Edition5
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Summary:The utility model relates to an intellectualized harmonic factor testing apparatus for electrically powered telephone, which is a multifunctional intellectualized apparatus controlled by a microcomputer. The utility model is composed of a microcomputer, a telephone harmonic factor testing apparatus, an interface circuit, a digital-analog converter, a controller, a display and a shielding casing, wherein, the telephone harmonic factor testing apparatus is composed of an input network, a variable attenuator, a preamplifier, an analog switch, a filter, a main amplifier, a voltage converter and a buffer amplifier. The filter comprises telephone weight, audio frequency and harmonic filter. The apparatus is provided with an oscillator for self-test and self-checking, and the input network is provided with a crowbar protection. The utility model has the characteristics of high performance, low cost, etc., and the utility model can be used for measuring the waveform deviation factor.
Bibliography:Application Number: CN1992213813U