Precise AC resistance measuring instrument and measuring method thereof

A technology of AC resistance and measuring instrument, applied in the direction of measuring electrical variables, measuring devices, measuring resistance/reactance/impedance, etc., can solve the problems of high cost, large error, low accuracy, etc., and achieve easy calculation, elimination of difference, cost-saving effect

Pending Publication Date: 2017-01-11
SHANGHAI INSTR RES INST
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  • Application Information

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Problems solved by technology

To solve the problems of low accuracy, high cost and l

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  • Precise AC resistance measuring instrument and measuring method thereof
  • Precise AC resistance measuring instrument and measuring method thereof
  • Precise AC resistance measuring instrument and measuring method thereof

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1 As shown, the precision AC resistance measuring instrument of the present invention includes a microprocessor, a sine wave oscillator, a frequency divider, a phase controller, a first sine wave generator, a second sine wave generator, a filter, a power amplifier , operational amplifiers, signal selectors, and phase detectors. The sine wave oscillator is used to generate a sine wave test signal, the signal output end of the sine wave oscillator is connected to the signal input end of the frequency divider, and the test signal output end of the frequency divider is controlled by phase The frequency divider is connected to the first sine wave generator, and the reference signal output terminal of the frequency divider is connected to the second sine wave generator through the phase controller, and the frequency o...

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Abstract

The present invention relates to a precise AC resistance measuring instrument and a measuring method thereof. The precise AC resistance measuring instrument comprises a microprocessor, a sine wave oscillator, a frequency divider, a phase controller, a first sine wave generator, a second sine wave generator, a filter, a signal selector, and a phase discriminator. The input end of the frequency divider is connected to the sine wave oscillator. The output end of the frequency divider is connected to the first sine wave generator and the second sine wave generator. The sine wave generated by the first sine wave generator is used as the test signal source of the phase discriminator. The sine wave generated by the second sine wave generator is used as the reference signal source of the phase discriminator. The vector synthesis voltage of a standard resistor and a tested piece is measured through the phase discriminator and is sent to the microprocessor, and the microprocessor calculates the resistance value of the tested piece. According to the precise AC resistance measuring instrument, the classical bridge measurement technology is substituted by the phase discriminator measurement technology, the difference between a common mode current output and a detector converter scale coefficient is eliminated, the measurement is more accurate, the structure is simple, and the cost is low.

Description

technical field [0001] The invention relates to a precision AC resistance measuring instrument and a measuring method thereof. Background technique [0002] China developed AC resistors in the 1970s. Because the quality of nickel-based alloys was immature at that time, and the conditions for use had not yet been formed, it was not introduced into mass production. In the 1980s, I studied AC resistance with the Electromagnetic Department of the National Institute of Metrology. In view of the fact that the basic conditions were not yet mature, the time constant of 1-100,000 ohms was 1×10-8, and the frequency was 50 cycles. The main difficulty was the resistance material ( The resistivity is about 0.48), the accuracy of the calibration equipment for the AC parameters is not high enough, and the low resistance value of the AC-DC conversion error is 50ppm. [0003] Developing the instrumentation industry and developing instrumentation industrialization with independent intellectu...

Claims

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Application Information

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IPC IPC(8): G01R27/14
Inventor 余子健史淑娟金凯徐益民姚亮李红珍
Owner SHANGHAI INSTR RES INST
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