Computer based digital voltmeter

Abstract

The invention provides a device of voltage meters, which comprises a power supply and a plurality of components; Direct current is used for measuring with -5 to +5V of range; a circuitry comprises minimization design of single-chip microcomputer for data acquisition circuit, an interface circuit for the single-chip microcomputer and the PC, a clock circuit for the single-chip microcomputer, a reset circuit; AT89S51 chip is adopted for a AT89S51 and AD678 chip is adopted for A/D conversion; RS232 serial port is used for communication with the PC and measured DC voltage data is transmitted; the design of RS232 interface circuit is adopted and chip Max232 is adopted for the interface circuit of AT89S51 and the PC; 9-pin serial port DB9 is adopted for RS232 interface of serial communication; only a pin receiving data and a pin sending data are needed for the serial port transmission data to realize direct connection between the pin receiving data and the pin sending data with the same serial port using line; two serial ports are connected or one serial port is connected with a plurality of serial ports; the digital voltage meter based on computer communication of the invention has the advantages that not only the transmission of measured data can be completed and but also the process of the measured data with the computer can be performed.

Description

technical field [0001] The invention relates to a device device of a circuit, in particular to a device device of a voltmeter. Background technique [0002] There are many types and styles of digital voltmeter design and development. Traditional digital voltmeters have their own characteristics. They are suitable for manual measurement on site. To complete remote measurement and further analyze and process measurement data, traditional digital voltmeters Table could not be completed. Contents of the invention [0003] Aiming at the defects of the prior art, the present invention provides a practical voltmeter device. [0004] In order to achieve the above object, the present invention takes the following measures to achieve: [0005] A device for a voltmeter, including a power supply and a device, is characterized in that it adopts direct current measurement, and its range is -5 to +5V. The circuit of the whole machine includes a data acquisition circuit with a minimal d...

AI Technical Summary

Problems solved by technology

[0002] There are many types and styles of digital voltmeter design and development. Traditional digital voltmeters have their own characteristics. They are suitable f...