Current sensor linearity test system and calibration method

Abstract

A current sensor linearity test system and a calibration method are provided. The system comprises a program-controlled digital constant current source and a PC upper computer, the program-controlleddigital constant current source is used for providing reference current Yi of constant current output for a current sensor to be calibrated, and the PC upper computer is electrically connected with the program-controlled digital constant current source and used for setting output parameters for the program-controlled digital constant current source. And the PC upper computer is also electrically connected with the current sensor to be calibrated and is used for acquiring the current working current and carrying out linearity calibration on the current working current.

Description

technical field [0001] The invention relates to the field of sensor testing and calibration, in particular to a current sensor linearity testing system and a calibration method. Background technique [0002] Current detection technology is widely used in the field of industrial automation, electric vehicles, power transmission, monitoring and maintenance of electrical equipment and other fields. At present, the common current sensors mainly include Hall current sensor and fluxgate current sensor. Both current sensors use the "electric-magnetic-electric" conversion method to measure current, and the final sensor output (voltage or current) is related to the measured value. The current is linearly proportional, and has the advantages of high test accuracy, good linearity, and short response time. The main indicators of the current sensor are: measurement accuracy, linearity, sensitivity, hysteresis, consistency, drift parameters, etc. Therefore, as one of the most important ...

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Problems solved by technology

[0004] In theory, the final output of the current sensor (voltage or current) is linearly proportional to the measured current, but due to components, magnetic cores, winding processes, etc., some current sensors have poor linearity and poor linearity in actual measurement. The product affects the measurement accuracy of the product and the consistency of the product, resulting in a low pass rate of the product, thereby increasing the overall cost of the product and causing a waste of resources

[0005] At present, the current sensor manufacturers mainly deal with the linearity. The linearity test is carried out on the current sensor before leaving the factory, and the unqualified products whose linearity is not up to the standard are eliminated, but the overall cost of the product will increase and the resources will be wasted. Cost, did not test the linearity of the product, resulting in unqualified products flowing into the market, causing great losses to engineering applications

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