High sensitive voltmeter

Abstract

The invention relates to a high sensitive voltmeter. The high sensitive voltmeter comprises a shell, a pointer, a dial, a moving coil and a plurality of binding posts, wherein the moving coil is arranged inside the shell and connected with the pointer, the plurality of binding posts are arranged below the shell, the moving coil comprises an aluminium sash and a coil wound on the aluminium sash, and the three binding posts comprise two binding posts with different measuring ranges and one negative binding post. The moving coil in an ordinary voltmeter is completely altered and rewound by using very thick wires, the small electromotive force can be amplified for scores of times and displayed, and the measuring range of 3 DEG C or 30 DEG C can be selected and used for displaying temperature differences. In the invention, compared with the ordinary voltmeter, the sensitivity of a micro voltage is improved by scores of times, and experimental effects are intuitive and visible; the high sensitive voltmeter is convenient for students to learn by observation and particularly suitable for classroom teaching and experiments, can be used for measuring the temperature difference and has wider application range, low cost, easy operation, simple structure, accurate and reliable measuring data, small volume, convenient carrying and convenience for generalizing and applying in a wide range of areas.

Description

technical field [0001] The invention relates to a voltmeter, in particular to a high-sensitivity voltmeter. Background technique [0002] At present, a kind of prior art, the equipment device of voltmeter, comprises power supply, device, uses direct current to measure, and its range is -5~+5V, and whole machine circuit includes the single-chip microcomputer minimization design of data acquisition circuit, single-chip microcomputer and PC interface circuit , SCM clock circuit, reset circuit, the lower computer adopts AT89S51 chip, A / D conversion adopts AD678 chip, communicates with PC through RS232 serial port, transmits the measured DC voltage data, and adopts the design of RS232 interface circuit, AT89S51 and The interface circuit of the PC uses the chip Max232, and the RS232 interface of the serial port communication uses a 9-pin serial port DB9. As long as the serial port has a receiving data pin and a sending pin, the receiving pin and the sending pin of the same serial ...

AI Technical Summary

Problems solved by technology

[0006] 1. Since the multi-functional RMS voltmeter of the prior art uses five "ideal diodes", the diodes are easily damaged, the cost is relatively high, and repair and maintenance are troublesome

[0007] 2. This prior art multifunctional RMS voltmeter has complex structure and inconvenient operation due to the combination of low-level nonlinear function operation circuit and operational amplifier circuit.

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