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Multifunctional electrical parameter measuring instrument

An electrical parameter measuring instrument and multi-functional technology, which can be applied to measuring devices, measuring electrical variables, multi-tester circuits, etc., can solve the problems of single measuring function, damage to the instrument, increase the operational complexity of the user's economic burden, etc., and achieve measurement accuracy. High, high sensitivity, easy to automate management effect

Inactive Publication Date: 2008-05-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

In addition, traditional measuring instruments have a single measurement function, and general instruments can only measure one or two electrical parameters. If multiple electrical parameters need to be measured, multiple single-function measuring instruments are required to measure, which increases the complexity of operation and the The economic burden, and easy to damage the instrument by misoperation

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  • Multifunctional electrical parameter measuring instrument

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[0040]The multifunctional electrical parameter measuring instrument of the present invention can use the following components for its hardware circuit: the voltage converter 1 can use a voltage transformer, the current converter 5 can use a current transformer, and the first and second D / A controllable attenuation / The amplifiers 2 and 6 can jointly adopt an analog switch (such as CD4052, CD4053, etc.); A / D converter (such as TLC1543 etc.), the device of phase difference detector 4, the first, the second optocoupler 41,42 can adopt an optocoupler jointly (as TLP521-2 etc.); Zero-crossing comparator 43,44 can adopt a kind of operational amplifier (as LM324 etc.) jointly, single-chip microcomputer 8 can adopt chips such as AT89C51 and AT89C2051 and AT8086, and display module 9 can adopt liquid crystal and nixie tube display, (as nixie tube display adopts HC595 Three-state 8-bit shift register and ULN2003 driver to drive digital tube or liquid crystal display), input module 10 ca...

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Abstract

The invention discloses a multi-functional electric parameters testing meter, which comprises a voltage converter, a first controllable weakening amplifier, a second controllable attenuator or amplifier, a first A / D converter, a second A / D converter, a phase difference detector, a current converter, a single chip microcomputer, a display module, and an input module. A communicating model which is connected with the single chip microcomputer can be arranged additionally. The invention adopts a combined method which combines the controllable weakening amplifier and the A / D converter to increase accuracy, a practical control through the single chip microcomputer is available, thereby automatic tests for a plurality of parameters as power frequency voltage, electric current, power, power factors, frequency, and the like are finished. The invention has characteristics of direct and accurate display, simple use, and the like, and can be used widely for situations which need automatic measuring power frequency multi-parameters as enterprises, labs, and the like.

Description

technical field [0001] The invention belongs to the technical field of electric measurement, and in particular relates to a multifunctional power frequency alternating current parameter measuring instrument controlled by a single-chip microcomputer. Background technique [0002] The measurement of power frequency AC parameters is widely used. When using traditional measuring instruments, it is necessary to estimate the measurement range of the value to be measured in advance, and in most cases, it is necessary to switch from a larger range gear to a smaller range gear one by one. In addition, traditional measuring instruments have a single measurement function, and general instruments can only measure one or two electrical parameters. If multiple electrical parameters need to be measured, multiple single-function measuring instruments are required to measure, which increases the complexity of operation and the The economic burden, and it is easy to cause damage to the instr...

Claims

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Application Information

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IPC IPC(8): G01R15/12G01R15/09G01R25/00
Inventor 魏伟李军
Owner HUAZHONG UNIV OF SCI & TECH
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