CN101526560B - Electronic measuring method based on electromagnetic induction principle and measuring multimeter - Google Patents
Electronic measuring method based on electromagnetic induction principle and measuring multimeter Download PDFInfo
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- CN101526560B CN101526560B CN 200910129234 CN200910129234A CN101526560B CN 101526560 B CN101526560 B CN 101526560B CN 200910129234 CN200910129234 CN 200910129234 CN 200910129234 A CN200910129234 A CN 200910129234A CN 101526560 B CN101526560 B CN 101526560B
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Abstract
The invention relates to an electronic measuring method based on an electromagnetic induction principle and a measuring multimeter, wherein, the electronic measuring method comprises the following steps: the alternating voltage, the alternating current and the low resistance of a measured object are measured according to the magnetic flux change of the measured object; an internal microprocessor and an electronic component are connected to various circuits so as to intelligently control the measuring process of the measured object; a pair of double-current pliers are used for detecting the measured object, and the double plier heads are taken as a transmitting terminal and a receiving terminal, wherein, the transmitting terminal outputs a square signal with a frequency of 1582Hz, and the receiving terminal receives the scattered signal and converts the scattered signal into a current signal to finish the measurement sampling; by comparing with a preset standard resistance, the measuring voltage, the measuring current and the measuring resistance are determined; and an internal converting circuit, a control circuit, a trigger shaping circuit and a sequential control circuit are connected with a data processing device so as to finish the measured value processing which is then displayed and output by an LCD.
Description
Technical field
The present invention relates to electronic measuring method and measure multimeter, relate in particular to a kind of measurement test product magnetic flux change of passing through based on electromagnetic induction principle and measure the electronic measuring method of alternating voltage, alternating current and small resistor and a kind of pincerlike voltage, electric current and resistance measurement multimeter of waterproof Non-Destructive Testing.
Background technology
In the field of electronic measuring method, various Principle and method of measurements are disclosed, measuring method based on which kind of principle all needs by test pencil measurand to be carried out contact measurement, destruction measured object surface, form damage, and the interference that can not avoid interference the source causes the error of its measurement result, and the symmetrical sensor that adopts the at present mostly reduce disturbance source of also can only trying one's best, can't eradicate and the existence of avoiding interference property, the many course of normal operation that can have influence on electronic surveying of the variation of measurement environment and the restriction of condition, cover the normal signal problem such as the filtering undesired signal, outdoor measurement safety guarantee problem of rainy day and sophisticated product require nondestructive measurement etc. problem all directly to affect the security of its measurement, accuracy and property convenient to operation can't ensure in all directions that its measurement reaches most convenient fast and the purpose of safety and precise.
Present electronic measuring device all needs to contact behind the test product by pointed display measurement value by key devices such as test pencil and dial plates, function is too single and but modification scope is narrow, and the installation setting of electronic original part can't solve the problems such as its table body integral waterproofing problem makes its user can not avoid getting an electric shock to cause danger.
Summary of the invention
For above shortcomings in the prior art, the present invention provides a kind of electronic measuring method based on electromagnetic induction principle for addressing the above problem; The present invention also provides a kind of measurement multimeter of realizing the method.
The present invention is that to address the above problem the technical scheme that adopts as follows:
Electronic measuring method based on electromagnetic induction principle, measure its alternating voltage, alternating current and small resistor by detecting the measurand magnetic flux change, be connected to various circuit by built-in miniature processor and electronic component and make its measuring process of its Based Intelligent Control, its method may further comprise the steps:
(1) use the double-current pincers to detect measurand, two binding clips are respectively as transmitting terminal and receiving end, and the transmitting terminal output frequency is the 1582Hz square-wave signal; Described double-current pincers comprise a pair of binding clip that consists of the double-current mutual inductor, arbitrary binding clip all can be used as the usefulness that signal transmits and receives, control transmitting and receiving of control waveform signal of the closure of described binding clip upper jaw/open, described emission output waveform signals is fixed its frequency range at least by frequency generator, closes measuring ability by the switching of binding clip and finishes measurement.
(2) receive the back scattered signal of institute by receiving end and be converted into current signal and finish and measure sampling; Compare by the measuring resistance with setting, thereby judge its measuring voltage, electric current and resistance; Scattering frequency heterodyne by transmitting and receiving signal etc. reflects its measurand magnetic flux change, utilize the pliers-shape earthing resistance instrument core algorithm to calculate its voltage, electric current and resistance by the resolution processes program, described measuring resistance resistance is counted in the algorithm as motionless variable.
(3) utilize built-in change-over circuit, control circuit, triggering shaping circuit and sequential control circuit to connect data processing apparatus and finish the measured value processing procedure, and show output by LCD display; Embed by built-in high-performance MPU programming and to finish corresponding module and make up and the control function, be connected to the LCD display of external seal operation keyboard and automatic backlight control function with interlock circuit.
Wherein, described resistance measurement scope can reach 0.01-1500 Ω, and its highest resolution can reach 0.001 Ω, and accuracy can reach ± (1%+0.01 Ω); Described current measuring range can reach 0.1mA-20.00A, and its highest resolution can reach 0.01mA, and accuracy can reach ± (1%+0.01mA); Described voltage measurement scope can reach 200mV-400V, and its highest resolution can reach 0.1V, and accuracy can reach ± (1%+0.01V).
A kind of measurement multimeter of realizing above-mentioned electronic measuring method comprises a pair of current clamp and a table body, it is characterized in that described current clamp comprises the binding clip of a pair of current transformer; Described table body is provided with external supervisory keyboard and LCD display, the built-in high-performance MPU of embedded software, a plurality of function electronic component and the system's direct supply of being solidified with, and it interconnects by control circuit and change-over circuit respectively.
Described table body button arranges realizes the seamless waterproof processing, and namely described LCD display and supervisory keyboard are embedded in described table body outside surface, and the tie point of described double-current clipper joint line carries the connecting line contact with the table body can adopt the plug and play pattern.
Described built-in high-performance MPU is solidified with by software platform embedded programming practical function modular structure, it comprise a jaw closed/open the automatically accurate sensing module of test gear shift module, an automatic shutdown control module and a sensor of control module, a linear detection module, an automatic backlight control module, a 1582Hz frequency generator module, a keyboard and LCD display control module, an accurate self-checking system module.
Described automatic test gear shift module, accurate self-checking system module, keyboard and LCD display control module, automatic shutdown control module and jaw be closed/open module directly to interconnect with the built-in MPU of system by the control change-over circuit cyclic process of realization information transmission processing.
Beneficial effect of the present invention is: this invention realizes Based Intelligent Control operation and simplified measurement operation, intelligent, the integrated and software implementation of its mentality of designing generally; Do not use and measure test pencil contact test product, ensure test product surface nondestructive wound; Utilize electromagnetic induction principle to measure its magnetic flux change, fixedly high-frequency square-wave signal reduces various interference sources to the interference of measurement result, ensures measurement accuracy; Realize that by the programming special algorithm high precision computation function guarantees that the degree of accuracy of measuring increases substantially and automatically tests gear shift control and can make things convenient for various test data to show that simultaneously output conveniently checks; Button arranges and realizes that waterproof stitchless processing, rainwater outdoor study guarantee that still non-contact electric is dangerous on the measurement mechanism; The LCD display of automatic backlight control and embedded supervisory keyboard make it have the dust of preventing and are infected with, also can be anti-riot etc. function.
The present invention is described in detail below in conjunction with accompanying drawing;
Figure of description
Fig. 1 is the FB(flow block) of electronic measuring method in the embodiment of the invention;
Fig. 2 measures multimeter system architecture module frame chart in the embodiment of the invention;
Fig. 3 measures multimeter hardware principle structured flowchart in the embodiment of the invention.
Embodiment
Referring to Fig. 1, the electronic measuring method based on electromagnetic induction principle that present embodiment provides, measure its alternating voltage, alternating current and small resistor by detecting the measurand magnetic flux change, be connected to various circuit by built-in miniature processor and electronic component and make its measuring process of its Based Intelligent Control, its method may further comprise the steps:
(1) use the double-current pincers to detect measurand, two binding clips are respectively as transmitting terminal and receiving end, and the transmitting terminal output frequency is the 1582Hz square-wave signal; Described double-current pincers comprise a pair of binding clip that consists of the double-current mutual inductor, arbitrary binding clip all can be used as the usefulness that signal transmits and receives, control transmitting and receiving of control waveform signal of the closure of described binding clip upper jaw/open, described emission output waveform signals is fixed its frequency range at least by frequency generator, closes measuring ability by the switching of binding clip and finishes measurement.
(2) receive the back scattered signal of institute by receiving end and be converted into current signal and finish and measure sampling; Compare by the measuring resistance with setting, thereby judge its measuring voltage, electric current and resistance; Scattering frequency heterodyne by transmitting and receiving signal etc. reflects its measurand magnetic flux change, utilize the pliers-shape earthing resistance instrument core algorithm to calculate its voltage, electric current and resistance by the resolution processes program, described measuring resistance resistance is counted in the algorithm as motionless variable;
(3) utilize built-in change-over circuit, control circuit, triggering shaping circuit and sequential control circuit to connect data processing apparatus and finish the measured value processing procedure, and show output by LCD display; Embed by built-in high-performance MPU programming and to finish corresponding module and make up and the control function, be connected to the LCD display of external seal operation keyboard and automatic backlight control function with interlock circuit.
The scope of resistance measurement described in the present embodiment can reach 0.01-1500 Ω, and its highest resolution can reach 0.001 Ω, and accuracy can reach ± (1%+0.01 Ω); Described current measuring range can reach 0.1mA-20.00A, and its highest resolution can reach 0.01mA, and accuracy can reach ± (1%+0.01mA); Described voltage measurement scope can reach 200mV-400V, and its highest resolution can reach 0.1V, and accuracy can reach ± (1%+0.01V).
A kind of measurement multimeter of realizing above-mentioned electronic measuring method comprises a pair of current clamp and a table body, it is characterized in that described current clamp comprises the binding clip of a pair of current transformer; Described table body is provided with external supervisory keyboard and LCD display, the built-in high-performance MPU of embedded software, a plurality of function electronic component and the system's direct supply of being solidified with, and it interconnects by control circuit and change-over circuit respectively; Described table body button arranges realizes the seamless waterproof processing, and namely described LCD display and supervisory keyboard are embedded in described table body outside surface, and the tie point of described double-current clipper joint line carries the connecting line contact with the table body can adopt the plug and play pattern;
Described built-in high-performance MPU is solidified with by software platform embedded programming practical function modular structure, it comprise a jaw closed/open the automatically accurate sensing module of test gear shift module, an automatic shutdown control module and a sensor of control module, a linear detection module, an automatic backlight control module, a 1582Hz frequency generator module, a keyboard and LCD display control module, an accurate self-checking system module; Described automatic test gear shift module, accurate self-checking system module, keyboard and LCD display control module, automatic shutdown control module and jaw be closed/open module directly to interconnect with the built-in MPU of system by the control change-over circuit cyclic process of realization information transmission processing.
Particularly, the electronic measuring method based on electromagnetic induction principle that present embodiment provides, it measures its alternating voltage, alternating current and small resistor by detecting the measurand magnetic flux change, be connected to various circuit by built-in miniature processor and electronic component and make its measuring process of its Based Intelligent Control, its method may further comprise the steps: use the double-current pincers to detect measurand, two binding clips are respectively as transmitting terminal and receiving end, and the transmitting terminal output frequency is the 1582Hz square-wave signal; Receive the back scattered signal of institute and be converted into current signal by receiving end and finish and measure sampling; Compare by the measuring resistance with setting, thereby judge its measuring voltage, electric current and resistance; Utilize built-in change-over circuit, control circuit, triggering shaping circuit and sequential control circuit to connect data processing apparatus and finish the measured value processing procedure, and show output by LCD display.
The implementation step is as follows:
Opening system power switch at first, supply task by power module completion system direct current signal, can provide ± 5V, ± 12V, the various high-quality DC voltage such as ± 3.3V, described double-current pincers comprise a pair of binding clip that consists of the double-current mutual inductor, select arbitrary binding clip as the usefulness of signal emission or reception, control transmitting and receiving of control waveform signal of the closure of described binding clip upper jaw/open, described emission output waveform signals is processed through the wave filter digital filtering and is fixed at least its frequency range by frequency generator, present embodiment is selected the 1582Hz square wave, the accurate sensing of control sensor is converted to current signal with its physical quantity, closes measuring ability by the switching of binding clip and finishes the measurement data sampling.Scattering frequency heterodyne by transmitting and receiving signal etc. reflects its measurand magnetic flux change, the measuring resistance check and correction is set relatively, utilize the pliers-shape earthing resistance instrument core algorithm to calculate its measured value by the resolution processes program, be converted to respectively the magnitude of voltage of surveying, current value and resistance value by built-in automatic test gearshift module, described measuring resistance resistance is counted in the algorithm as motionless variable.
Finishing corresponding module by built-in high-performance MPU programming embedding makes up and the control function, adopt the (SuSE) Linux OS Fedora Core 4 of new generation of Redhat company as built-in Linux operating system kernel and instrument Embedded Software Platform, use Qt/Embcddcd exploitation instrumentation interface, programmable logic device (PLD) selects Cyclonc II (FPGA) family chip such as ALTERA company in MAX II (CPLD) family chip, after programming realizes itself and interlock circuit are connected to the LCD display of the external seal operation keyboard of device and automatic backlight control function, measurement data just can show output.
Described resistance measurement scope can reach 0.01-1500 Ω, and its highest resolution can reach 0.001 Ω, and accuracy can reach ± (1%+0.01 Ω); Described current measuring range can reach 0.1mA-20.00A, and its highest resolution can reach 0.01mA, and accuracy can reach ± (1%+0.01mA); Described voltage measurement scope can reach 200mV-400V, and its highest resolution can reach 0.1V, and accuracy can reach ± (1%+0.01V).
Referring to Fig. 2 and Fig. 3, a kind of measurement multimeter of realizing above-mentioned electronic measuring method comprises a pair of current clamp and a table body, and described current clamp comprises the binding clip of double-current mutual inductor; The external supervisory keyboard of described table body and LCD display, built-in high-performance MPU, a plurality of function electronic component and system's direct supply interconnect by various control circuits and change-over circuit.
Described table body button arranges realizes the seamless waterproof processing, and namely described LCD display and supervisory keyboard are embedded in described table body outside surface, and the tie point of described double-current clipper joint line carries the connecting line contact with the table body can adopt the plug and play pattern; Described built-in high-performance MPU is by software platform embedded programming practical function modular structure, it comprise a jaw closed/open the automatically accurate sensing module of test gear shift module, an automatic shutdown control module and a sensor of control module, a linear detection module, an automatic backlight control module, a 1582Hz frequency generator module, a keyboard and LCD display control module, an accurate self-checking system module.
Described automatic test gear shift module, accurate self-checking system module, keyboard and LCD display control module, automatic shutdown control module and jaw closure/change-over circuit is direct wants to link the cyclic process of realization information transmission processing with the built-in MPU of system by controlling to open module.
The present invention is not limited to above-mentioned embodiment, and the same or analogous method of all employings and the present invention and system architecture thereof realize other all modes of the object of the invention, all within protection scope of the present invention.
Claims (2)
1. electronic measuring method based on electromagnetic induction principle, measure its alternating voltage, alternating current and small resistor by detecting the measurand magnetic flux change, it is characterized in that, be connected to various circuit by built-in miniature processor and electronic component and make this microprocessor Based Intelligent Control measuring process, its method may further comprise the steps:
(1) use the double-current pincers to detect measurand, two binding clips are respectively as transmitting terminal and receiving end, and the transmitting terminal output frequency is the 1582Hz square-wave signal;
(2) receive the back scattered signal of institute by receiving end and be converted into current signal and finish and measure sampling; Compare by the measuring resistance with setting, thereby judge its measuring voltage, electric current and resistance;
(3) utilize built-in change-over circuit, control circuit, triggering shaping circuit and sequential control circuit to connect data processing apparatus and finish the measured value processing procedure, and show output by LCD display;
Described step (2) is further comprising the steps of: reflect its measurand magnetic flux change by the scattering frequency heterodyne that transmits and receives signal, the measuring resistance check and correction is set relatively, utilize the pliers-shape earthing resistance instrument core algorithm to calculate its voltage, electric current and resistance by the resolution processes program, described measuring resistance resistance is counted in the algorithm as motionless variable;
Described step (3) is further comprising the steps of: embed by built-in high-performance MPU programming and finish corresponding module structure and control function, adopt the (SuSE) Linux OS Fedora Core 4 of new generation of Red hat company as built-in Linux operating system kernel and instrument Embedded Software Platform, use Qt/Embcddcd exploitation instrumentation interface, programmable logic device (PLD) selects Cyclonc II (FPGA) family chip of ALTERA company in MAXII (CPLD) family chip, after programming realizes itself and interlock circuit are connected to the LCD display of external seal operation keyboard and automatic backlight control function, measurement data just can show output;
Described resistance measurement scope can reach 0.01-1500 Ω, and its highest resolution can reach 0.001 Ω, and accuracy can reach ± (1%+0.01 Ω); Described current measuring range can reach 0.1mA-20.00A, and its highest resolution can reach 0.01mA, and accuracy can reach ± (1%+0.01mA); Described voltage measurement scope can reach 200mV-400V, and its highest resolution can reach 0.1V, and accuracy can reach ± (1%+0.01V);
Described double-current pincers comprise a pair of binding clip that consists of the double-current mutual inductor, arbitrary binding clip all can be used as the usefulness that signal transmits and receives, control transmitting and receiving of control waveform signal of the closure of described binding clip upper jaw/open, launch output waveform signal fix at least its frequency range by frequency generator, close measuring ability by the switching of binding clip and finish measurement.
2. a measurement multimeter of realizing the described electronic measuring method based on electromagnetic induction principle of claim 1 comprises a pair of current clamp and a table body, it is characterized in that described current clamp comprises the binding clip of double-current mutual inductor; The external supervisory keyboard of described table body and LCD display, built-in high-performance MPU, a plurality of function electronic component and system's direct supply interconnect by various control circuits and change-over circuit;
Described table body button arranges realizes the seamless waterproof processing, and namely described LCD display and supervisory keyboard are embedded in described table body outside surface, and the tie point of described double-current clipper joint line carries the connecting line contact with the table body can adopt the plug and play pattern;
Described built-in high-performance MPU is by software platform embedded programming practical function modular structure, it comprise a jaw closed/open the automatically accurate sensing module of test gear shift module, an automatic shutdown control module and a sensor of control module, a linear detection module, an automatic backlight control module, a 1582Hz frequency generator module, a keyboard and LCD display control module, an accurate self-checking system module.
Described jaw is closed/and open control module, linear detection module, automatic backlight control module, 1582Hz frequency generator module, keyboard and LCD display control module, accurate self-checking system module, automatically test the accurate sensing module of gear shift module, automatic shutdown control module and sensor and directly interconnect the cyclic process of realization information transmission processing with the built-in MPU of system.
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| CN102279299A (en) * | 2011-06-30 | 2011-12-14 | 保定供电公司 | Special pincer-shaped electric universal meter |
| CN111076791B (en) * | 2019-10-28 | 2021-06-11 | 华中科技大学 | Working method of strong anti-interference system suitable for reflective/transmissive sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349289A (en) * | 1992-04-27 | 1994-09-20 | Kaise Kabushiki Kaisha | Clamp-on multimeter having a display for indicating the results of a plurality of measurements |
| CN2556651Y (en) * | 2002-01-24 | 2003-06-18 | 徐先 | Automatic range digital AC/DC pincerlike multimeter |
| CN2809654Y (en) * | 2005-06-24 | 2006-08-23 | 宋国娥 | Double-jaw ground resistance tester |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349289A (en) * | 1992-04-27 | 1994-09-20 | Kaise Kabushiki Kaisha | Clamp-on multimeter having a display for indicating the results of a plurality of measurements |
| CN2556651Y (en) * | 2002-01-24 | 2003-06-18 | 徐先 | Automatic range digital AC/DC pincerlike multimeter |
| CN2809654Y (en) * | 2005-06-24 | 2006-08-23 | 宋国娥 | Double-jaw ground resistance tester |
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