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Computer based digital voltmeter

A voltmeter and power supply technology, applied in the field of circuit equipment, can solve problems such as the inability of a digital voltmeter to complete

Inactive Publication Date: 2008-05-21
FANGXIA ENTERPRISE INFORMATION CONSULTING WUJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 for manual measurement on site. To complete remote measurement and further analyze and process measurement data, traditional digital voltmeters table could not be completed

Method used

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Embodiment Construction

[0007] D678 is a high-end, multi-functional 12-bit ADC. Because it has a sample holder, a high-precision reference power supply, an internal clock, and a three-state buffered data output, it only needs a few external components. It constitutes a complete data acquisition system, and an A / D conversion only needs 5ms. Max232 is a chip compatible with RS232 standard launched by Texas Instruments (TI). The device includes 2 drivers, 2 receivers and 1 voltage The generator circuit provides the TIA / EIA-232-F level, and the Max232 chip functions as a level shifter to match the TTL level of the microcontroller with the RS232 level of the PC. In the program, the programming operation of the single-chip microcomputer must fully comply with the timing specification requirements of the AD678. In the actual development, it must be continuously debugged. Finally, the .bin file generated by the successful debugging of the lower computer is solidified into the Flash unit of the AT89S51.

[00...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): G08C19/02G08C19/00
Inventor 谢瑜金珠韩璐
Owner FANGXIA ENTERPRISE INFORMATION CONSULTING WUJIANG
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