CN105759112A - Digital voltage meter achieving automatic range switching - Google Patents
Digital voltage meter achieving automatic range switching Download PDFInfo
- Publication number
- CN105759112A CN105759112A CN201610348557.3A CN201610348557A CN105759112A CN 105759112 A CN105759112 A CN 105759112A CN 201610348557 A CN201610348557 A CN 201610348557A CN 105759112 A CN105759112 A CN 105759112A
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- CN
- China
- Prior art keywords
- chip microcomputer
- circuit
- change
- single chip
- over circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
A digital voltage meter achieving automatic range switching comprises an automatic range selection circuit, an A/D conversion circuit, a single chip microcomputer, a frequency dividing circuit and a display circuit. Input voltage is judged by the automatic range selection circuit, a range is selected, high voltage needs to be appropriately attenuated before entering the A/D conversion circuit, when the high voltage is attenuated to be within a certain range, analog voltage is converted into a digital value through the A/D conversion circuit to be output and transmitted to the single chip microcomputer for processing, the A/D conversion circuit generates a negative pulse each time when the A/D conversion circuit transmits a signal to the single chip microcomputer, the pulse files an application to outside interruption of the single chip microcomputer, the single chip microcomputer is switched to execute an interruption program, the single chip microcomputer processes and outputs data through software control, the processed data is sent to the display circuit to be displayed, and a clock signal needed by the A/D conversion circuit is generated through outputting of the single chip microcomputer and frequency dividing of the frequency dividing circuit.
Description
Technical field
The present invention relates to the digital voltmeter of a kind of automatic range switching.
Background technology
21 century is digitized epoch, and digital product miscellaneous enters each fields such as scientific research, commercial production and life like the mushrooms after rain.Traditional needle dc voltmeter function singleness, precision are low, it is impossible to meeting the demand of digital times, digital voltmeter arises in this context.Digital voltmeter (DigitalVoltmeter) is called for short DVM, and it is to adopt Digital Measuring Technique, continuous print analog quantity (direct current or AC-input voltage) is converted to discontinuous, discrete digital quantity form the instrument shown.Extremely user's favor owing to digital instrument has features such as accuracy of reading is convenient, precision high, error is little, highly sensitive and resolution is high, measuring speed is fast, digital voltmeter is namely based on this demand and grows up.The design of current digital voltmeter and exploitation, had polytype and style, as by digital circuit and that circuit is constituted, based on monolithic processor controlled, based on FPGA control, based on CPLD control etc..
In the high speed development process of hyundai electronics science and technology, the high precision int of microminiaturized, integrated, densification and equipment has become as a kind of long-term trend, and this just requires that we make every effort to use more accurate equipment.In the such trend development of digital voltmeter forward, following digital voltmeter is more towards intellectuality.
Summary of the invention
Present invention aim to address the problems referred to above, it is provided that the digital voltmeter of a kind of automatic range switching.
The purpose of the present invention is accomplished by:
A kind of digital voltmeter of automatic range switching, including range automatic selection circuit, A/D change-over circuit, single-chip microcomputer, frequency dividing circuit and display circuit, the voltage of input judges through range automatic selection circuit and selects range, high voltage also needs to carry out suitable decay before entering A/D change-over circuit, converted analog voltage to digital output when decaying to certain limit by A/D change-over circuit and be sent to single-chip microcomputer process, A/D change-over circuit all can produce a negative pulse when transmitting signal toward single-chip microcomputer every time, this pulse is interrupted filing an application outside single-chip microcomputer, single-chip microcomputer turns to execution interrupt routine, single-chip microcomputer controls data to be processed and exports by software, feeding display circuit shows, clock signal needed for A/D change-over circuit produces after dividing then through frequency dividing circuit after being exported by single-chip microcomputer.
Further, described single-chip microcomputer is AT89S52.
Further, described A/D change-over circuit adopts double integration A/D converter.
The invention has the beneficial effects as follows:
The SCM Based digital voltmeter of the present invention, have can gear selecting automatically, measure scope big, the feature that precision is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
It is further described in detail presently in connection with accompanying drawing.
nullAs shown in Figure 1，A kind of digital voltmeter of automatic range switching，Including range automatic selection circuit 1，A/D change-over circuit 2，Single-chip microcomputer 3，Frequency dividing circuit 4 and display circuit 5，The voltage of input judges through range automatic selection circuit 1 and selects range，High voltage also needs to carry out suitable decay before entering A/D change-over circuit 2，By A/D change-over circuit 2, analog voltage converts digital output when decaying to certain limit to be sent to single-chip microcomputer 3 and process，A/D change-over circuit 2 all can produce a negative pulse when transmitting signal toward single-chip microcomputer 3 every time，This pulse is interrupted filing an application outside single-chip microcomputer 3，Single-chip microcomputer 3 turns to execution interrupt routine，Single-chip microcomputer 3 controls data to be processed and exports by software，Send into display circuit and show 5，Clock signal needed for A/D change-over circuit 2 produces after dividing then through frequency dividing circuit 4 after being exported by single-chip microcomputer 3.
Described single-chip microcomputer is AT89S52.
Described A/D change-over circuit adopts double integration A/D converter.
The foregoing is only the schematic detailed description of the invention of the present invention, be not limited to the scope of the present invention.Any those skilled in the art, equivalent variations done under without departing from the design of the present invention and the premise of principle and amendment, all should belong to the scope of protection of the invention.
Claims (3)
- null1. the digital voltmeter of an automatic range switching，It is characterized in that，Including range automatic selection circuit，A/D change-over circuit，Single-chip microcomputer，Frequency dividing circuit and display circuit，The voltage of input judges through range automatic selection circuit and selects range，High voltage also needs to carry out suitable decay before entering A/D change-over circuit，Converted analog voltage to digital output when decaying to certain limit by A/D change-over circuit and be sent to single-chip microcomputer process，A/D change-over circuit all can produce a negative pulse when transmitting signal toward single-chip microcomputer every time，This pulse is interrupted filing an application outside single-chip microcomputer，Single-chip microcomputer turns to execution interrupt routine，Single-chip microcomputer controls data to be processed and exports by software，Feeding display circuit shows，Clock signal needed for A/D change-over circuit produces after dividing then through frequency dividing circuit after being exported by single-chip microcomputer.
- 2. the digital voltmeter of automatic range switching according to claim 1, it is characterised in that described single-chip microcomputer is AT89S52.
- 3. the digital voltmeter of automatic range switching according to claim 1, it is characterised in that described A/D change-over circuit adopts double integration A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610348557.3A CN105759112A (en) | 2016-05-24 | 2016-05-24 | Digital voltage meter achieving automatic range switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610348557.3A CN105759112A (en) | 2016-05-24 | 2016-05-24 | Digital voltage meter achieving automatic range switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105759112A true CN105759112A (en) | 2016-07-13 |
Family
ID=56322331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610348557.3A Pending CN105759112A (en) | 2016-05-24 | 2016-05-24 | Digital voltage meter achieving automatic range switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105759112A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459697A (en) * | 2018-09-18 | 2019-03-12 | 安恒环境科技（北京）股份有限公司 | For measuring the device of electric current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201251595Y (en) * | 2008-09-10 | 2009-06-03 | 重庆大学 | Speech-broadcasting direct current voltmeter |
| CN202975141U (en) * | 2012-12-15 | 2013-06-05 | 安徽工程大学 | Range-adaptive digital voltmeter |
| CN104316756A (en) * | 2014-10-10 | 2015-01-28 | 陕西易阳科技有限公司 | Digital voltage meter |
-
2016
- 2016-05-24 CN CN201610348557.3A patent/CN105759112A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201251595Y (en) * | 2008-09-10 | 2009-06-03 | 重庆大学 | Speech-broadcasting direct current voltmeter |
| CN202975141U (en) * | 2012-12-15 | 2013-06-05 | 安徽工程大学 | Range-adaptive digital voltmeter |
| CN104316756A (en) * | 2014-10-10 | 2015-01-28 | 陕西易阳科技有限公司 | Digital voltage meter |
Non-Patent Citations (1)
| Title |
|---|
| 贾培军等: "一种量程自动切换数字电压表的设计", 《山西电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459697A (en) * | 2018-09-18 | 2019-03-12 | 安恒环境科技（北京）股份有限公司 | For measuring the device of electric current |
| CN109459697B (en) * | 2018-09-18 | 2019-12-20 | 安恒环境科技（北京）股份有限公司 | Device for measuring current |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160713 |