Circuit and method of accurately measuring resistance in Wheatstone bridge by using computer

Abstract

The invention discloses a circuit and method for accurately measuring resistance in a Wheatstone bridge by using a computer. The circuit includes a PC, an embedded processor, a Wheatstone bridge, a bridge exchange circuit and a voltage comparison circuit; the PC is used for Issue control commands, adjust bridge arm resistance, judge bridge balance, collect measurement data, and calculate data; the Wheatstone bridge is composed of the first comparison resistor, the second comparison resistor, the resistance to be measured and the resistance source, according to the instructions transmitted by the PC Adjust the resistance value; the bridge exchange circuit is used to provide circuit branches, so that the positions of the first comparison resistor and the second comparison resistor in the Wheatstone bridge are exchanged; the voltage comparison circuit is used to collect the voltage between the upper end and the lower end of the bridge differential pressure and output to the embedded processor. The invention effectively solves the problems of cumbersome measurement operations and relatively large measurement errors in the resistance measurement process, makes data processing more intuitive, scientific and accurate, and facilitates later applications that require precise resistance.

Description

Technical field [0001] The present invention relates to the field of electronic measurement techniques, and in particular, a circuit and method for accurate measurement resistance using a computer in the Horses Power Bridge. Background technique [0002] At present, the method of measured resistance in the University Physical Laboratory is to use manual measurements. By adjusting the bridge arm to zero, record the knob contact resistance box resistance, use the molten method, calculate the two resistors The top of the box read value is the measurement resistance. There are two types of problems in such a measure: (1) Due to the use of human eye observation of the electroplative reading, the time-free labor, there is more than the error brought about by human experiment, and the work is too cumbersome and the error is too large. In terms of data processing, it is necessary for human processing or human input computer, process complex, absence of data, resulting in incorrect measur...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology, and propose a circuit and method for accurately measuring resistance in a Wheatstone bridge using a computer, which can effectively solve the complicated measurement operation and large measurement error in the resistance measurement process problems, making resistance measurement simpler, faster and more convenient, making data processing more intuitive, scientific and accurate, and facilitating later applications that require precise resistance

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