Resistance measurement method and device based on adjustable current source
A technology of resistance measurement and current source, which is applied in the electronic field, can solve the problems of resistance measurement method and complex structure of the device, and achieve the effect of simple hardware structure
Active Publication Date: 2014-03-26
BEIJING AEROSPACE MEASUREMENT & CONTROL TECH
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[0004] In view of the above analysis, the present invention aims to provide a resistance measurement method and device based on an adjustable current source to solve the problem of complex structure of the resistance measurement method and device in the prior art
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[0024] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention. For the sake of clarity and simplicity, detailed descriptions of known functions and constructions in the devices described herein will be omitted when it may obscure the subject matter of the present invention.
[0025] This patent provides a resistance measurement method and device based on an adjustable current source, which is suitable for resistance meters, digital multimeters or other occasions requiring resistance measurement. The method is universal and not aimed at a specific application; the method is reliable and can accurately measure the resistance value to be measured even when the calibration data is invalid.
[0026] figure 2 It is a str...
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The invention discloses a resistance measurement method and device based on an adjustable current source. The method includes the steps that the current source, a comparator and an MCU are sequentially connected; one end of each calibration resistor is grounded, the other end of each calibration resistor is connected with the comparator and the current source respectively, the current of the current source is controlled by the MCU to change gradually, inverted output of the comparator is generated when the voltage applied to the calibration resistor is larger than a reference voltage value preset by the comparator, and the value of a current output to the current source is recorded by the MCU at the moment; currents corresponding to the multiple calibration resistors are sequentially measured, and all the calibration resistors and the corresponding currents are fitted to obtain a current-resistance curve. According to the method, the current-resistance curve is obtained by measuring the calibration resistors, the current of the current source is controlled by the MCU to change gradually, the value of the current output to the current source is recorded by the MCU when inverted output of the comparator is generated, and the resistance value of a resistor to be measured is worked out according to the current value and the current-resistance curve. The method has the advantages that a hardware structure is simple and reliable, and the method can achieve high-precision resistance measurement with low cost when applied to resistance measurement.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a method and device for measuring resistance based on an adjustable current source. Background technique [0002] Resistance is the most basic electrical parameter, and the measurement of resistance is of great significance to various industries such as electronic circuit debugging, industrial production, food safety, medical and health care, etc. [0003] There are various resistance measurement methods, some for high-precision measurement, some for high-speed measurement, some for high-voltage environments, some for online measurement, some for analog measurement methods, and some for digital measurement methods. In most digital multimeters Measuring devices such as figure 1 shown. Specifically, a fixed current is applied to the resistance to be measured within the same range, and the current forms a voltage on the resistance to be measured. The voltage signal is converte...
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Inventor 高伟强胡志臣刘家玮储艳丽李浩璧
Owner BEIJING AEROSPACE MEASUREMENT & CONTROL TECH