CN201562017U - Portable device for quickly measuring conductor conductivity - Google Patents
Portable device for quickly measuring conductor conductivity Download PDFInfo
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- CN201562017U CN201562017U CN2009202627572U CN200920262757U CN201562017U CN 201562017 U CN201562017 U CN 201562017U CN 2009202627572 U CN2009202627572 U CN 2009202627572U CN 200920262757 U CN200920262757 U CN 200920262757U CN 201562017 U CN201562017 U CN 201562017U
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Abstract
The utility model relates to the field of the measuring device, in particular to a portable device for quickly measuring conductor conductivity, which comprises an intelligent detector and a four-terminal electrode test frame for locating a tested conductor. The intelligent detector controls an output circuit of a digital controlled constant-current source circuit through a singlechip control circuit, which is connected with the four-terminal electrode test frame, and sends a voltage signal of the tested conductor by a weak voltage amplification circuit from a first A/D conversion circuit to the singlechip control circuit. The digital controlled constant-current source circuit is connected with a current detection circuit and sent to the singlechip control circuit for processing through a second A/D conversion circuit. The portable device for quickly measuring conductor conductivity provided by the utility model has the advantages of no any manual calculation, simple operation, exact and reliable measurement, fast detection speed, measurement of a plurality of parameters one time; small size, low cost, portability, both on-site and field application.
Description
Technical field
The utility model relates to the measurement mechanism field, relates in particular to the measurement mechanism of a kind of detection conductor (lead) resistivity, conductivity, and a kind of portable unit of fast measuring conductor conductivity is provided.
Background technology
The resistivity value of conductor, conductivity value are the important physical indexs of reflection conductor electric conductivity, can carry out the evaluation of the discriminating of sorting, condition of heat treatment of material and hardness, anticorrosion stress-resistant performance by the measurement result of conductivity value.The method of measuring material electric conductivity, resistivity at present mainly contains eddy-current method, four termination electrode methods, microresistivity survey method fall in current-voltage.Conductor at the bigger sheet of sectional area, bulk, the general eddy-current method that adopts is measured fast simply, for conductor such as electric wire, the cable etc. of sectional area less than the eddy current probe diameter, eddy-current method can't be measured, and traditional detection method is with single armed or double bridge mensuration, but because complex operation, Measuring Time is long, also will manually calculate the end value of conductivity, resistivity, work efficiency is extremely low, and the error that exists connection conductor resistance and contact resistance to bring.
Resistivity measurement system and the microresistivity survey instrument that four terminal mensurations fall in current-voltage released in market in recent years, and four termination electrode mensurations are being measured little resistance as 10
-5Ohmage magnitude resistance can effectively be eliminated the error that connection conductor resistance and contact resistance bring, and can substitute bridge measurement electric wire resistivity value, and is simpler than bridge method in the operation.System is huge, cost is high, can't be carried to scene and field operation but still exist, the selection of continuous current, the input of forward and reverse electric current, the correction of conductor material temperature coefficient etc. failed to realize best automatic control when much the function of indispensability was as measurement in resistivity measurement, and the accuracy of measurement, reappearance still difficulty are guaranteed.End value of Ce Lianging such as conductivity, resistivity still need artificial or obtain by computing machine in addition, and efficient is not high, and is easy to generate personal error.
The utility model content
At above-mentioned the deficiencies in the prior art, the utility model provides a kind of portable unit of fast measuring conductor conductivity, need not any artificial calculating, simple to operate, measure accurately and reliably, measurement that detection speed soon, once can be finished multiple parameter; Volume is little, cost is low, easy to carry, be applicable to scene, the open-air use.
The technical scheme that the utility model adopted is:
A kind of portable unit of fast measuring conductor conductivity, comprise intelligent detection device and be used to locate four termination electrode testing jigs of measured conductor, described intelligent detection device is the output current by single chip machine controlling circuit control digital-control constant-flow source circuit, and be connected to described four termination electrode testing jigs by the electric current commutating circuit and provide the detection electric current for it, by the weak voltage amplifying circuit that is connected with four termination electrode testing jigs the voltage signal of measured conductor is sent to single chip machine controlling circuit through an A/D change-over circuit again, described electric current commutating circuit connects and is controlled by single chip machine controlling circuit, described digital-control constant-flow source circuit is connected with current detection circuit, and be sent to single chip machine controlling circuit by the 2nd A/D change-over circuit, described single chip machine controlling circuit also with power circuit, temperature sensor, keyboard is connected with display, in real time displays temperature data and metrical information.
Further, described four termination electrode testing jigs comprise fixed support and are installed on a pair of voltage detecting positioning collet on its two ends, the fixed support both sides also are connected with the electric current input chuck of a pair of activity, and described four termination electrode testing jigs are to be connected with described pick-up unit by the cable port of being located at the middle part.
Further, described single chip machine controlling circuit also is connected with the R232 communication port.Described power circuit is by battery powered.
The present invention is based upon current-voltage to fall on the four termination electrode mensuration bases, when constant dc this device electric current input chuck of flowing through flows into conductor (lead), because the resistance of conductor exists, the constant current DC current just produces dc voltage drop on conductor, measure this magnitude of voltage, according to Ohm law
But the resistance value at conductor two ends is then according to conductor length L and conductor cross-sectional area S, according to conductor resistance and resistivity relation
Obtain electricalresistivity's value and conductivity=1/ ρ value.
The portable unit of a kind of fast measuring conductor conductivity that the utility model provides has automatically selected constant current source electric current, automatic current commutation, automatic zero point correction, automatic temperature-adjusting coefficient correction, and the beneficial effect that is compared to prior art is:
(1) the utility model can be realized quick continuous detecting, has overcome traditional single armed of using, and long, the artificial evaluation work efficient of double bridge complex operation, Measuring Time is low, and connect the measuring error that conductor resistance and contact resistance bring.
(2) the utility model adopts powered battery, and volume is little, cost is low, adopts single chip machine controlling circuit to finish the measurements and calculations process automatically, and is simple to operate, measure fast, can be convenient for carrying on-the-spot and open-air the use.
(3) owing to adopt the digital-control constant-flow source circuit, single chip machine controlling circuit is according to the voltage that detects, select the selected automatically constant current source output DC stream of electric current principle by the best of setting, overcome the excessive heating effect of electric current to measured conductor, too small measuring accuracy and the resolution of influencing of electric current has improved measuring speed and measuring accuracy.
(4) the utility model adopts single chip machine controlling circuit Control current commutating circuit, each measurement result is all got arithmetic mean by forward and reverse twice measurement, all eliminate no-voltage, zero current processing, overcome the measuring error that metering circuit zero drift and personnel operation produce, guaranteed the accuracy of measurement data.
Description of drawings
Fig. 1 is the theory diagram of the portable unit of a kind of fast measuring conductor of the utility model conductivity;
Fig. 2 is the structural representation of the utility model four termination electrode testing jigs;
Fig. 3 is the structural representation of the utility model four termination electrode testing jig bottom surfaces.
Embodiment
Existing accompanying drawings and embodiment further specify the utility model.
As shown in Figure 1, a kind of portable unit of fast measuring conductor conductivity, comprise intelligent detection device and be used to locate four termination electrode testing jigs 2 of measured conductor, described intelligent detection device is the output current by single chip machine controlling circuit 1 control digital-control constant-flow source circuit 3, and be connected to described four termination electrode testing jigs 2 by electric current commutating circuit 7 and provide the detection electric current for it, by the weak voltage amplifying circuit 4 that is connected with four termination electrode testing jigs 2 voltage signal of measured conductor is sent to single chip machine controlling circuit 1 through an A/D change-over circuit 61 again, described electric current commutating circuit 7 connects and is controlled by single chip machine controlling circuit 1, described digital-control constant-flow source circuit 3 is connected with current detection circuit 5, and be sent to single chip machine controlling circuit 1 by the 2nd A/D change-over circuit 62, described single chip machine controlling circuit 1 also with power circuit 8, temperature sensor 9, keyboard 10 is connected with display 11, in real time displays temperature data and metrical information.Described single chip machine controlling circuit 1 also is connected with R232 communication port 12.Described power circuit 8 is by battery 81 power supplies.
Further, as shown in Figures 2 and 3, described four termination electrode testing jigs 2 comprise fixed support 27 and are installed on a pair of voltage detecting positioning collet 21,22 on its two ends, fixed support 27 both sides also are connected with the electric current input chuck of a pair of activity, and described four termination electrode testing jigs 2 are to be connected with described pick-up unit by the cable port 26 of being located at the middle part.
The course of work of the present utility model is:
The diameter or the sectional area of measured conductor (lead) keyed in the start back by the keyboard of device, use electric current--the voltage detecting positioning collet on the voltage drop four termination electrode testing jigs is clamped the measured conductor two ends, live voltage chuck outer conductors part with movable electric current input clip head-clamp again, constitute the loop of an electric current.By measuring button, single chip machine controlling circuit enters automatic selection digital-control constant-flow source circuit output current program, electric current progressively increases from small to large through electric current input active chuck inflow conductor circuit, produce a faint DC voltage at voltage detecting positioning collet two ends, this voltage is after the voltage amplification of nearly ten thousand times of weak voltage amplifying circuits, send into single chip machine controlling circuit by an A/D change-over circuit, the magnitude of voltage that single chip machine controlling circuit obtains according to voltage detecting, by former setting select the electric current principle, the control digital-control constant-flow source is exported only DC current.After electric current was selected, single chip machine controlling circuit entered the process of measurement of conductivity, resistivity.At first system enters forward voltage and forward current measurement, single chip machine controlling circuit Control current commutating circuit forward conduction, electric current flows into conductor from the electric current input chuck 23 of activity, flow out conductor from the electric current input chuck 24 of activity, single chip machine controlling circuit Schilling digital-control constant-flow source output this moment zero current, be connected to electric current input chuck 23 movable on the four termination electrode testing jigs through the electric current commutating circuit by stube cable and cable port 26,24, zero current flows into conductor from electric current input chuck 23, electric current input chuck 24 flows out conductor and forms the loop, at voltage detecting locating clip chuck 21,22 two ends produce the forward no-voltage, through the weak voltage amplifying circuit, the one A/D change-over circuit is sent into single chip machine controlling circuit, obtains the measured value of forward no-voltage.The forward zero current detection signal of digital-control constant-flow source circuit is sent into the measured value that single chip machine controlling circuit obtains the forward zero current through current detection circuit, the 2nd A/D change-over circuit.Then single chip machine controlling circuit makes the selected DC current of digital-control constant-flow source circuit output again, this electric current inflow and outflow measured conductor route is the same with the route that the forward zero current is flowed through, on conductor, produce the faint DC voltage of forward, send into single chip machine controlling circuit through weak voltage amplifying circuit, an A/D change-over circuit, handle the influence of elimination forward no-voltage through single-chip data and obtain forward voltage measurement exact value V
JustDigital-control constant-flow source circuit forward current detection signal is sent into single chip machine controlling circuit through current detection circuit, the 2nd A/D change-over circuit simultaneously, handles the influence of elimination zero current through single-chip data and obtains forward current measurement exact value I
Just
Secondly, system enters reverse voltage and reverse-current metering, single chip machine controlling circuit Control current commutating circuit reverse-conducting, and electric current flows into conductor from the electric current input chuck 24 of activity, from electric current input chuck 24 outflows of activity.All the other testing processes are identical with the forward measurement, finally obtained eliminating the reverse voltage measurement exact value V of reverse no-voltage influence
InsteadWith the reverse-current metering exact value I that eliminates reverse zero current influence
Instead
At last, single chip machine controlling circuit is according to forward and reverse voltage measurement exact value, and forward and reverse current measurement exact value is obtained the mean value of measuring voltage with arithmetic mean method
Measure the mean value of electric current
According to Ohm law
Can obtain between two voltage detecting positioning collets on the four end testing jigs conductor resistance value accurately, the conductor diameter or the sectional area S that key in when single chip machine controlling circuit is according to conductor distance length L between two voltage detecting positioning collets and measurement then, automatically calculate the measured value such as conductivity, resistivity of measured conductor (lead), export to display and show.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within the scope of the utility model protection.
Claims (4)
1. the portable unit of a fast measuring conductor conductivity, it is characterized in that: comprise intelligent detection device and be used to locate four termination electrode testing jigs (2) of measured conductor, described intelligent detection device is the output current by single chip machine controlling circuit (1) control digital-control constant-flow source circuit (3), and be connected to described four termination electrode testing jigs (2) by electric current commutating circuit (7) and provide the detection electric current for it, by the weak voltage amplifying circuit (4) that is connected with four termination electrode testing jigs (2) voltage signal of measured conductor is sent to single chip machine controlling circuit (1) through an A/D change-over circuit (61) again, described electric current commutating circuit (7) connects and is controlled by single chip machine controlling circuit (1), described digital-control constant-flow source circuit (3) is connected with current detection circuit (5), and be sent to single chip machine controlling circuit (1) by the 2nd A/D change-over circuit (62), described single chip machine controlling circuit (1) also with power circuit (8), temperature sensor (9), keyboard (10) is connected with display (11), in real time displays temperature data and metrical information.
2. the portable unit of a kind of fast measuring conductivity according to claim 1, it is characterized in that: described four termination electrode testing jigs (2) comprise fixed support (27) and are installed on a pair of voltage detecting positioning collet (21,22) on its two ends, fixed support (27) both sides also are connected with the electric current input chuck of a pair of activity, and described four termination electrode testing jigs (2) are to be connected with described pick-up unit by the cable port (26) of being located at the middle part.
3. the portable unit of a kind of fast measuring conductivity according to claim 1 is characterized in that: described single chip machine controlling circuit (1) also is connected with R232 communication port (12).
4. the portable unit of a kind of fast measuring conductivity according to claim 1 is characterized in that: described power circuit (8) is powered by battery (81).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202627572U CN201562017U (en) | 2009-11-09 | 2009-11-09 | Portable device for quickly measuring conductor conductivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202627572U CN201562017U (en) | 2009-11-09 | 2009-11-09 | Portable device for quickly measuring conductor conductivity |
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| Publication Number | Publication Date |
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| CN201562017U true CN201562017U (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202627572U Expired - Fee Related CN201562017U (en) | 2009-11-09 | 2009-11-09 | Portable device for quickly measuring conductor conductivity |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680791A (en) * | 2012-05-24 | 2012-09-19 | 重庆市防雷中心 | Automatic test system for resistance reducing agent resistivity and power frequency current tolerance test |
| CN103513111A (en) * | 2013-09-06 | 2014-01-15 | 国家电网公司 | System and method for testing electric conductivity of metal wire |
| CN104330633A (en) * | 2014-10-22 | 2015-02-04 | 中国石油化工股份有限公司 | Floating roof storage tank float tray connection wire on-line monitoring device |
| CN104459329A (en) * | 2014-11-25 | 2015-03-25 | 苏州市职业大学 | Device for testing metal electrical resistivity change within continuous temperature range |
| CN110672926A (en) * | 2019-10-24 | 2020-01-10 | 河北工业大学 | Electrical material conductivity measuring device and measuring system suitable for different working conditions |
| CN110940862A (en) * | 2019-12-16 | 2020-03-31 | 大连大学 | Method for measuring liquid resistivity |
-
2009
- 2009-11-09 CN CN2009202627572U patent/CN201562017U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680791A (en) * | 2012-05-24 | 2012-09-19 | 重庆市防雷中心 | Automatic test system for resistance reducing agent resistivity and power frequency current tolerance test |
| CN103513111A (en) * | 2013-09-06 | 2014-01-15 | 国家电网公司 | System and method for testing electric conductivity of metal wire |
| CN103513111B (en) * | 2013-09-06 | 2016-08-17 | 国家电网公司 | The conductivity test system of a kind of plain conductor and method of testing |
| CN104330633A (en) * | 2014-10-22 | 2015-02-04 | 中国石油化工股份有限公司 | Floating roof storage tank float tray connection wire on-line monitoring device |
| CN104459329A (en) * | 2014-11-25 | 2015-03-25 | 苏州市职业大学 | Device for testing metal electrical resistivity change within continuous temperature range |
| CN110672926A (en) * | 2019-10-24 | 2020-01-10 | 河北工业大学 | Electrical material conductivity measuring device and measuring system suitable for different working conditions |
| CN110672926B (en) * | 2019-10-24 | 2021-08-10 | 河北工业大学 | Electrical material conductivity measuring device and measuring system suitable for different working conditions |
| CN110940862A (en) * | 2019-12-16 | 2020-03-31 | 大连大学 | Method for measuring liquid resistivity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161209 Address after: 361000 617A, Xiamen City, Fujian Torch High-tech Park Venture Park Building Patentee after: Xiamen Research Instrument Co., Ltd. Address before: 361009 Xiamen Venture Park, Fujian venture building unit 622 Patentee before: Cai Shengli |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20181109 |