Multi-range capacitance measurement circuit, device and method

Abstract

The invention relates to a multi-range capacitance measurement circuit, device and method. The multi-range capacitance measurement circuit comprises a square wave generation circuit, a waveform shaping circuit, a singlechip microcomputer minimum system and a display, wherein the square wave generation circuit comprises an NE555 chip, a resistor network and a reference capacitor; the resistor network comprises a resistor matrix and a first multi-way switch connected with the resistor matrix; the resistor matrix comprises multiple resistors with different resistance values; the first multi-way switch comprises multiple first switches connected with the resistors one by one and a first control chip for controlling the multiple first switches; the multiple resistors are connected in parallel. According to the multi-range capacitance measurement circuit, a singlechip microcomputer controls the first control chip to turn on different first switches, to change connected resistors of the resistor matrix and adjust the range of the multi-range capacitance measurement circuit, so as to measure to-be-measured capacitors with different capacitance values; the multi-range capacitance measurement circuit is simple, easy and convenient to operate and adjustable in measuring range, and can meet an actual application requirement.

Description

technical field [0001] The invention relates to the technical field of capacitance measurement, in particular to a multi-range capacitance measurement circuit, device and method. Background technique [0002] With the development of ultra-precision manufacturing, precision instruments and modern industrial information technology, capacitance effect is a basic measurement object in the field of measurement. Through the capacitance measurement of the plate capacitor, important parameters such as the dielectric constant of the dielectric material between the plates and the distance between the plates can be obtained. It has a wide range of applications in the fields of chemical industry, agriculture, materials, machinery, process control, and pipeline inspection. At present, most of the commonly used capacitance measuring instruments are analog circuits, such as bridge circuits. When the capacitance difference between the measured capacitance and the standard capacitance is la...

AI Technical Summary

Problems solved by technology

At present, most of the commonly used capacitance measuring instruments are analog circuits, such as bridge circuits. When the capacitance difference between the measured capacitance and the standard capacitance is large, it will cause a certain nonlinearity, resulting in an increase in the capacitance measurement error. Therefore, it cannot meet the capacitance measurement requirements of a large range.

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