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Small capacitance measuring instrument

A technology of tiny capacitance and measuring instrument, applied in the field of instrument measurement, can solve the problems of frequency limitation and high cost, and achieve the effect of simple circuit, low cost and simple operation

Inactive Publication Date: 2017-01-11
褚秀清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AC lock-in amplification This method provides the best measurement performance, but is costly and frequency limited

Method used

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Embodiment Construction

[0015] like figure 1 Shown is a block diagram of the overall system structure of a micro-capacitance measuring instrument of the present invention. It includes a single-chip microcomputer, a main measurement circuit, a signal integration circuit, an A / D conversion circuit, and a measurement result display circuit; the key points of its structure are: the main measurement circuit is connected to the signal integration circuit, and the signal integration circuit is connected to the A / D conversion circuit , the A / D conversion circuit is connected to the single-chip microcomputer, and the single-chip microcomputer is connected to the measurement result display circuit; the measurement result display circuit includes an LCD liquid crystal display, and the single-chip computer includes a timing counter, a watchdog timer, and a power-down detection circuit. circuit, power-on reset circuit, button.

[0016] The model that described single-chip microcomputer adopts is MSP4305529; Said...

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PUM

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Abstract

The invention relates to a small capacitance measuring instrument and belongs to the technical field of measuring instruments, which has the advantages of low cost, small volume, high measurement accuracy, simple and convenient operation and the like. The small capacitance measuring instrument comprises a single-chip microcomputer, a main measurement circuit, a signal integration circuit, an A / D conversion circuit, and a measurement result display circuit. The small capacitance measuring instrument is characterized in that the main measurement circuit and the signal integration circuit are connected. The signal integration circuit and the A / D conversion circuit are connected. The A / D conversion circuit and the single-chip microcomputer are connected. The single-chip microcomputer and the measurement result display circuit are connected. The measurement result display circuit comprises a liquid crystal display (LCD). The single-chip microcomputer comprises a timing counter, a watchdog timer, a power failure detection circuit, a power-on reset circuit, and a key.

Description

technical field [0001] The invention belongs to the technical field of instrument measurement, and in particular relates to a tiny capacitance measuring instrument. Background technique [0002] At present, the commonly used way to measure small capacitance is to use a digital multimeter to measure directly, but it is difficult to achieve high accuracy with this method. At the same time, the measurement range is also very small, and even many tiny capacitances cannot be measured at all. Traditional high-precision capacitance measurement methods include AC bridge, charge / discharge, and AC lock-in amplification. For the AC bridge, because it has no balancing measures, it is more cumbersome to adjust and the measurement speed is slower. The charge / discharge capacitance detection circuit adopts DC amplification, which has large drift and the problem of charge injection. AC lock-in amplification This method has the best measurement performance, but is expensive and frequency l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 褚秀清
Owner 褚秀清
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