CN103575994A - Portable automatic resistance tester - Google Patents
Portable automatic resistance tester Download PDFInfo
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- CN103575994A CN103575994A CN201210280295.3A CN201210280295A CN103575994A CN 103575994 A CN103575994 A CN 103575994A CN 201210280295 A CN201210280295 A CN 201210280295A CN 103575994 A CN103575994 A CN 103575994A
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Abstract
The invention discloses a portable automatic resistance tester which comprises an LED display screen, a key, a single chip microcomputer, a motor driving circuit, a relay control circuit, a partial-voltage type resistance measuring module, a voltage-stabilizing compensating circuit, a voltage collecting circuit, a signal amplifying circuit and an overload protecting circuit, wherein the output end of the voltage-stabilizing compensating circuit is respectively connected with the input end of the voltage collecting circuit and the input end of the single chip microcomputer, the output end of the voltage collecting circuit is connected with the output end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected with the input end of the single chip microcomputer, the control end of the single chip microcomputer is connected with the input end of relay control circuit, and the output end of the relay control circuit is connected with the partial-voltage type resistance measuring module. The single chip microcomputer is utilized to control a relay to be switched on and off to achieve automatic switching of a measuring range. Compared with a traditional resistance tester, the portable automatic resistance tester is smaller in size, higher in measuring accuracy and simpler in circuit structure. Meanwhile, the measuring stability of the portable automatic resistance tester is greatly improved.
Description
Technical field
The present invention relates to a kind of resistance meter, particularly relate to a kind of Portable Automatic resistance meter.
Background technology
Direct current resistance is an important parameter of tractive transformer.For production division, by measuring direct current resistance, not only can check the quality problems of transformer in the technological processs such as coiling, welding, lead-in wire, and the data that record also can be used as the important parameter that loss is calculated.For maintenance department, can check out that locomotive is in utilization process, Transformer Winding sealing-off, connect the problem of the aspect such as loosening, aging, for locomotive implementation state, repair and there is very high practical value.And existing resistance meter can not resistance measuring instrument be not easy to carry, and measuring accuracy, stability is poor, also do not have overload protection merit simultaneously.
Summary of the invention
To the object of the invention is to provide in order addressing the above problem a kind of simple in structure, long service life, to realize the Portable Automatic resistance meter of overload protection.
The present invention is achieved by the following technical solutions:
A kind of Portable Automatic resistance meter, comprise LED display, button, single-chip microcomputer, motor-drive circuit, control relay circuit, partial pressure type resistance measuring circuit, voltage regulation compensation circuit, voltage collection circuit, signal amplification circuit and overload protecting circuit, the output terminal of described voltage regulation compensation circuit is connected with the input end of described voltage collection circuit and the input end of described single-chip microcomputer respectively, the output terminal of described voltage collection circuit is connected with the output terminal of described signal amplification circuit, the output terminal of described signal amplification circuit is connected with the input end of described single-chip microcomputer, the control end of described single-chip microcomputer is connected with the input end of described control relay circuit, the output terminal of described control relay circuit is connected with described partial pressure type resistance measuring circuit.
Voltage collection circuit transfers to signal amplification circuit by the voltage signal of collection, signal transfers to single-chip microcomputer after amplifying, after single-chip microcomputer is processed voltage signal, control signal is transferred to control relay circuit, and control relay circuit is according to the automatic conversion of receiving the resistance grade of signal controlling partial pressure type resistance measuring circuit.
LED display is display measurement resistance and error thereof in real time, can also show potentiometer resistance curve.
Further; described overload protecting circuit comprises motor-drive circuit, stepper motor and potentiometer; the output terminal of described single-chip microcomputer and the input end of described motor-drive circuit; the output terminal of described motor-drive circuit is connected with the input end of described stepper motor; the output terminal of described stepper motor is connected with described potentiometer; the output terminal of described stepper motor is connected with the input end of described potentiometer, and the output terminal of described potentiometer is connected with the input end of described partial pressure type resistance measuring circuit.For the scope that prevents from measuring surpasses the resistance value of regulation, be provided with overload protecting circuit, when the resistance that potentiometer detected is during higher than 50 Ω, single-chip microcomputer is to signal stepper motor, and stepper motor halts.
As preferably, described potentiometer is individual pen rotating potentiometer.
The invention has the beneficial effects as follows:
Utilize the break-make of Single-chip Controlling relay to realize the automatic switchover of range; less with traditional resistance meter phase specific volume, measuring accuracy is higher, circuit structure is simpler; Measurement sensibility also improves a lot simultaneously; for the scope that prevents from measuring surpasses the resistance value of stipulating; be provided with overload protecting circuit, when the resistance that potentiometer detected is during higher than 50 Ω, single-chip microcomputer is to signal stepper motor; stepper motor halts, and has improved security and has extended serviceable life.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the Portable Automatic resistance meter of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail:
As shown in Figure 1, the Portable Automatic resistance meter of the present invention, comprise LED display, button, single-chip microcomputer, motor-drive circuit, control relay circuit, partial pressure type resistance measuring circuit, voltage regulation compensation circuit, voltage collection circuit, signal amplification circuit and overload protecting circuit, the output terminal of described voltage regulation compensation circuit is connected with the input end of described voltage collection circuit and the input end of described single-chip microcomputer respectively, the output terminal of described voltage collection circuit is connected with the output terminal of described signal amplification circuit, the output terminal of described signal amplification circuit is connected with the input end of described single-chip microcomputer, the control end of described single-chip microcomputer is connected with the input end of described control relay circuit, the output terminal of described control relay circuit is connected with described partial pressure type resistance measuring circuit.
Voltage collection circuit transfers to signal amplification circuit by the voltage signal of collection, signal transfers to single-chip microcomputer after amplifying, after single-chip microcomputer is processed voltage signal, control signal is transferred to control relay circuit, and control relay circuit is according to the automatic conversion of receiving the resistance grade of signal controlling partial pressure type resistance measuring circuit.
LED display is display measurement resistance and error thereof in real time, can also show potentiometer resistance curve.
Described overload protecting circuit comprises motor-drive circuit, stepper motor and potentiometer; the output terminal of described single-chip microcomputer and the input end of described motor-drive circuit; the output terminal of described motor-drive circuit is connected with the input end of described stepper motor; the output terminal of described stepper motor is connected with described potentiometer; the output terminal of described stepper motor is connected with the input end of described potentiometer, and the output terminal of described potentiometer is connected with the input end of described partial pressure type resistance measuring circuit.For the scope that prevents from measuring surpasses the resistance value of regulation, be provided with overload protecting circuit, when the resistance that potentiometer detected is during higher than 50 Ω, single-chip microcomputer is to signal stepper motor, and stepper motor halts.Described potentiometer is individual pen rotating potentiometer.
Claims (3)
1. a Portable Automatic resistance meter, comprise LED display and button, it is characterized in that: also comprise single-chip microcomputer, motor-drive circuit, control relay circuit, partial pressure type resistance measuring circuit, voltage regulation compensation circuit, voltage collection circuit, signal amplification circuit and overload protecting circuit, the output terminal of described voltage regulation compensation circuit is connected with the input end of described voltage collection circuit and the input end of described single-chip microcomputer respectively, the output terminal of described voltage collection circuit is connected with the output terminal of described signal amplification circuit, the output terminal of described signal amplification circuit is connected with the input end of described single-chip microcomputer, the control end of described single-chip microcomputer is connected with the input end of described control relay circuit, the output terminal of described control relay circuit is connected with described partial pressure type resistance measuring circuit.
2. Portable Automatic resistance meter according to claim 1; it is characterized in that: described overload protecting circuit comprises motor-drive circuit, stepper motor and potentiometer; the output terminal of described single-chip microcomputer and the input end of described motor-drive circuit; the output terminal of described motor-drive circuit is connected with the input end of described stepper motor; the output terminal of described stepper motor is connected with described potentiometer; the output terminal of described stepper motor is connected with the input end of described potentiometer, and the output terminal of described potentiometer is connected with the input end of described partial pressure type resistance measuring circuit.
3. Portable Automatic resistance meter according to claim 2, is characterized in that: described potentiometer is individual pen rotating potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210280295.3A CN103575994A (en) | 2012-08-08 | 2012-08-08 | Portable automatic resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210280295.3A CN103575994A (en) | 2012-08-08 | 2012-08-08 | Portable automatic resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103575994A true CN103575994A (en) | 2014-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210280295.3A Pending CN103575994A (en) | 2012-08-08 | 2012-08-08 | Portable automatic resistance tester |
Country Status (1)
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| CN (1) | CN103575994A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018963A (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Portable insulation resistance test control system |
| CN107219399A (en) * | 2017-05-26 | 2017-09-29 | 武汉保华显示科技有限公司 | A kind of vehicle fuel resistance signal imitation devices and methods therefor |
| CN113567747A (en) * | 2021-07-26 | 2021-10-29 | 四川英杰电气股份有限公司 | Silicon core resistance value detection circuit, method and system |
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| WO1988001390A1 (en) * | 1986-08-13 | 1988-02-25 | Villamosenergiaipari Kutató Intézet | Contact resistance measuring device and measuring needle therefor |
| US5073920A (en) * | 1989-11-22 | 1991-12-17 | Hitachi, Ltd. | Method and apparatus of measuring a subscriber line |
| CN2508252Y (en) * | 2001-11-23 | 2002-08-28 | 贺明志 | Electric wire and cable AC resistance tester |
| CN2814423Y (en) * | 2005-01-18 | 2006-09-06 | 北京铁路局工电大修处天津电务段 | Electric cable insulation tester |
| CN201045624Y (en) * | 2007-04-28 | 2008-04-09 | 埃泰克汽车电子(芜湖)有限公司 | Resistor detection circuit for automobile instrument |
| JP4633885B2 (en) * | 2000-04-11 | 2011-02-16 | テンパール工業株式会社 | Measuring instrument for starting resistance |
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2012
- 2012-08-08 CN CN201210280295.3A patent/CN103575994A/en active Pending
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| WO1988001390A1 (en) * | 1986-08-13 | 1988-02-25 | Villamosenergiaipari Kutató Intézet | Contact resistance measuring device and measuring needle therefor |
| US5073920A (en) * | 1989-11-22 | 1991-12-17 | Hitachi, Ltd. | Method and apparatus of measuring a subscriber line |
| JP4633885B2 (en) * | 2000-04-11 | 2011-02-16 | テンパール工業株式会社 | Measuring instrument for starting resistance |
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| 佚名: "简易自动电阻测试仪", 《百度文库》, 8 November 2011 (2011-11-08), pages 1 - 11 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018963A (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Portable insulation resistance test control system |
| CN107219399A (en) * | 2017-05-26 | 2017-09-29 | 武汉保华显示科技有限公司 | A kind of vehicle fuel resistance signal imitation devices and methods therefor |
| CN113567747A (en) * | 2021-07-26 | 2021-10-29 | 四川英杰电气股份有限公司 | Silicon core resistance value detection circuit, method and system |
| CN113567747B (en) * | 2021-07-26 | 2023-11-17 | 四川英杰电气股份有限公司 | Silicon core resistance detection circuit, method and system |
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Application publication date: 20140212 |