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Digital alternating current resistance electrical bridge

A digital technology of AC resistance, applied in the field of precision measurement of AC impedance, can solve the problems of difficult maintenance and debugging, complex transformer bridge, etc., and achieve the effect of synchronous sampling measurement, improved measurement accuracy and high measurement accuracy

Active Publication Date: 2015-02-25
SHANGHAI INST OF MEASUREMENT & TESTING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a digital AC resistance bridge to solve the problem of complex transformer bridge and difficult maintenance and debugging

Method used

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  • Digital alternating current resistance electrical bridge
  • Digital alternating current resistance electrical bridge
  • Digital alternating current resistance electrical bridge

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Embodiment Construction

[0023] The specific implementation manner of the present invention will be described in more detail below with reference to schematic diagrams. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0024] The invention provides a digital AC resistance bridge, such as figure 1 shown, including: two-stage sensing voltage divider IVD; standard AC resistor R 1 , the measured AC resistance R 2 , a dual-channel simultaneous sampler 10 and a power supply U.

[0025] Specifically, the two-stage induction voltage divider IVD includes an excitation winding W 1 and a proportional winding W 2 , the excitation winding W 1 Including a first excitation terminal, a second excitation terminal and an intermediate tap, ...

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Abstract

The invention provides a digital alternating current resistance electrical bridge which comprises a two-stage induction voltage divider, a standard alternating current resistor, a tested alternating current resistor, a dual-channel synchronous sampling device and a power source, wherein both the standard alternating current resistor and the tested alternating current resistor are four-end resistors and comprise first voltage ends, second voltage ends, first current ends and second current ends; the dual-channel synchronous sampling device comprises a first channel and a second channel, and the second current end of the stand alternating current resistor and the second current end of the tested alternating current resistor are connected in series; the first current end of the standard alternating current resistor and the first current end of the tested alternating current resistor are connected with the power source through an isolation transformer. According to the digital alternating current resistance electrical bridge, an unbalanced electrical bridge structure is adopted, balance adjusting is not needed in the measuring process, and the problems that in a traditional measuring scheme, the balance adjusting process is tedious and the electrical bridge structure is complex are solved.

Description

technical field [0001] The invention relates to the field of precise measurement of AC impedance, in particular to a digital AC resistance bridge. Background technique [0002] In the practical application of electrical engineering, electronic technology and other fields, a large number of measurement of AC power is involved, and the measurement of AC voltage, current, power, etc. is closely related to AC resistance. Due to the influence of distributed capacitance, residual inductance and mutual inductance coupling, etc., the AC resistance has a certain frequency error, that is, the resistance value changes at different frequencies. The precise measurement of AC resistance is of great significance to improve the measurement accuracy of AC power. [0003] At present, the measurement of AC resistance mostly uses a transformer-type balanced bridge. The proportional arm of the bridge is an inductive voltage divider, and the other two bridge arms are the standard resistance and...

Claims

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Application Information

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IPC IPC(8): G01R17/10
Inventor 来磊冯建石雷兵许峰史小涛秦怡
Owner SHANGHAI INST OF MEASUREMENT & TESTING TECH
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