CN103616545A - Multifunctional low-voltage testing instrument - Google Patents
Multifunctional low-voltage testing instrument Download PDFInfo
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- CN103616545A CN103616545A CN201310607391.9A CN201310607391A CN103616545A CN 103616545 A CN103616545 A CN 103616545A CN 201310607391 A CN201310607391 A CN 201310607391A CN 103616545 A CN103616545 A CN 103616545A
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Abstract
The invention discloses a multifunctional low-voltage testing instrument. The multifunctional low-voltage testing instrument comprises a current-voltage conversion circuit, an R/V or V/V conversion circuit, a phase sequence distinguishing circuit and a temperature-voltage conversion circuit, wherein the current-voltage conversion circuit, the R/V or V/V conversion circuit, the phase sequence distinguishing circuit and the temperature-voltage conversion circuit are connected with a gear shifting circuit independently, and the gear shifting circuit is connected with an analog-to-digital conversion circuit after passing through a modifying circuit. The multifunctional low-voltage testing instrument further comprises an intelligent display module of a display screen, wherein the intelligent display module is connected with the analog-to-digital conversion circuit. The multifunctional low-voltage testing instrument is characterized in that the functions are complete. The multifunctional low-voltage testing instrument has all the functions of clamp meters of the similar types, the digital display phase sequence distinguishing function and the semiconductor rapid temperature measurement function and integrates a tong-type ammeter, a alternating-current and direct-current voltmeter, a live wire distinguishing device, a temperature measuring instrument and a phase sequence meter.
Description
Technical field:
The present invention relates to a kind of multifunctional low-voltage test instrumentation.
Background technology:
Equipment repair and maintenance in electric system are because repair apparatus, instrument that the various needs of overhauling project are used also can be a lot, and a kind of instrument just can only detect a project sometimes.The maintenance of at every turn going out all will be with a lot of repair apparatus and instrument, makes our limited staff and time can not get sufficient utilization, has greatly increased our repair and maintenance preliminary work.The instrument of finding some maintenance use in working practice is for many years very similar, if some functions are concentrated in together, make a multiduty measuring instrument, so not only can reduce the quantity of the Portable device of going out, it is time saving and energy saving to accomplish, can also increase work efficiency.
Summary of the invention:
For overcoming the defect of prior art, the object of the present invention is to provide a kind of multifunctional low-voltage test instrumentation, this instrument is easy and simple to handle, safety, economical and practical, and very easily promotes.In application, can greatly improve the whole efficiency of repair and maintenance work at the scene, also reduce the waste of repair apparatus, and from whole electric system, if this cover instrument is widely applied, will further reduce site examining and repairing maintenance cost.
Technical solution problem of the present invention adopts following technical scheme:
Multifunctional low-voltage test instrumentation, it comprises:
Is connected with gearshift circuit and to the analog voltage signal of gearshift circuit transmission amplify, the correction circuit of rectification, filtering;
The analog-to-digital conversion circuit that is used for receiving the analog voltage signal of described correction circuit transmission and analog voltage signal is converted into digital voltage signal;
For receiving the digital voltage signal of described analog-to-digital conversion circuit transmission the intelligent display module that digital voltage signal is processed and shown;
Be used for the current-voltage conversion circuit of measuring electric current and tested current signal being converted to analog voltage signal;
For test voltage, resistance and tested voltage resistance signal is converted to R/V, the V/V change-over circuit of analog voltage signal;
Be connected with the phase sequence cognition circuit detecting for phase sequence of phase sequence detection accessory;
For thermometric and measured signal is converted to the temperature-voltage conversion circuit of analog voltage signal, described temperature-voltage conversion circuit obtains measured signal by connecting semiconductor thermometric annex;
Described current-voltage conversion circuit, R/V, V/V change-over circuit, phase sequence cognition circuit and temperature-voltage conversion circuit are all connected with described gearshift circuit.
On described test instrumentation, be provided with the pincers of the testing current for measuring current that are connected with described current-voltage conversion circuit.
Described test instrumentation is provided with positive input terminal, the negative input terminal being connected with described R/V, V/V change-over circuit, and it is a pair of to be arranged at the injection moulding test pen of described positive input terminal, negative input end sub-connection.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, multifunctional low-voltage test instrumentation of the present invention adopts Smart Panel design, can carry out current detecting, DC voltage measurement, ac voltage measurement, and these functions can complete all working of pincerlike meter of the same type in repair and maintenance.
2, the present invention can also carry out live wire differentiation, and this function has substituted the test instrumentation of other congenerous completely, and more convenient test in real work has also improved work efficiency simultaneously.
3, the present invention also can carry out phase sequence cognition, by external phase sequence detection accessory, has replaced phase sequence cognition meter specially, has reduced testing apparatus in real work, makes test job convenient, quick.
4, the present invention also can carry out temperature detection, selects temperature range shelves during detection, connects thermometric annex, and hand-held temperature probe handle contacts testee by probe, can quick and precisely show testee temperature value.
Accompanying drawing explanation:
Figure 1A, 1B, 1C, 1D are respectively the structural representation of multifunctional low-voltage test instrumentation of the present invention, injection moulding test pen, phase sequence detection accessory and semiconductor thermometric annex; Fig. 2 is for adopting this instrument to carry out current measurement diagram; Fig. 3 is for adopting this instrument to carry out DC voltage measurement diagram; Fig. 4 is for adopting this instrument to carry out ac voltage measurement diagram; Fig. 5 differentiates diagram for adopting this instrument to carry out live wire; Fig. 6 connects diagram for carrying out phase sequence cognition; Fig. 7 is for carrying out temperature survey diagram; Fig. 8 is circuit frame principle figure of the present invention; Fig. 9 is phase sequence cognition circuit diagram.
Number in the figure: 1 testing current pincers, 2 power buttons, maintenance button, 3 rotary switches, 4 function conversion keys, 5 negative input terminals, 6 positive input terminals, 7 injection moulding test pens, 8 phase sequence detection accessory, 9 thermometric annexes.
Below pass through embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment:
Embodiment: in conjunction with Fig. 8, the multifunctional low-voltage test instrumentation of the present embodiment, its circuit theory comprises:
Is connected with gearshift circuit and to the analog voltage signal of gearshift circuit transmission amplify, the correction circuit of rectification, filtering; The analog-to-digital conversion circuit that is used for receiving the analog voltage signal of described correction circuit transmission and analog voltage signal is converted into digital voltage signal; For receiving the digital voltage signal of described analog-to-digital conversion circuit transmission the intelligent display module that digital voltage signal is processed and shown; Be used for the current-voltage conversion circuit of measuring electric current and tested current signal being converted to analog voltage signal; For test voltage, resistance and tested voltage resistance signal is converted to R/V, the V/V change-over circuit of analog voltage signal; Be connected with the phase sequence cognition circuit detecting for phase sequence of phase sequence detection accessory; For thermometric and measured signal is converted to the temperature-voltage conversion circuit of analog voltage signal, described temperature-voltage conversion circuit obtains measured signal by connecting semiconductor thermometric annex; Described current-voltage conversion circuit, R/V, V/V change-over circuit, phase sequence cognition circuit and temperature-voltage conversion circuit are all connected with described gearshift circuit.
Shown in Figure 1A-1D, instrument and annex comprise: for measuring the testing current pincers 1 of electric current, power button, keep button 2, for selecting the measurement range selection rotary switch 3 of different testing ranges, for selecting the function conversion keys 4 of different test functions for change-over circuit connected mode, the negative input terminal 5 that is suitable for all tests during test, the positive input terminal 6 that is suitable for all tests during test, 7 one pairs of two injection moulding test pens for test, the phase sequence detection accessory 8 detecting for phase sequence, for measuring the thermometric annex 9 of object temperature, such as adopting semiconductor temperature sensor etc.
Referring to Fig. 2, when measuring electric current with testing current pincers, by function conversion keys, current-voltage conversion circuit is connected to correction circuit by shift circuit, testing clamp senses tested electric current, tested current signal is converted to analog voltage signal through excess current-voltage conversion circuit, then by correction circuit, voltage signal is amplified, rectification, the useful signal that a series of processing such as filtering obtain wanting, by analog to digital conversion circuit, analog voltage signal is transformed into digital voltage signal again, intelligent display module is finally showing screen display result after digital voltage signal is processed.
Referring to Fig. 3,4, when with test test pencil measuring resistance, voltage, in like manner, by function conversion keys, change circuit connecting mode, by test pen, touch tested voltage, resistance, through V/V, R/V change-over circuit, measured signal is converted to analog voltage signal, then entered the useful signal that a series of processing such as correction circuit amplifies, rectification, filtering obtain wanting, by analog to digital conversion circuit, analog voltage signal is become to digital voltage signal, finally showing screen display result.
Referring to Fig. 5, in like manner, by function conversion keys, change circuit connecting mode, can carry out live wire differentiation, when differentiating, forward turn-knob switch to 750V range, will after black pen line winding multi-turn, hold in hand, then with a red probe, contact tested supply socket, as instrument has the prompting of continuous three sound, represent that red pen connect is live wire, otherwise be zero line or ground wire.
Referring to Fig. 7, when carrying out temperature detection with thermometric annex, in like manner, by function conversion keys, change circuit connecting mode, by thermometric annex contact measured signal, through excess temperature-voltage conversion circuit, signal is converted to analog voltage signal, then through correction circuit, process and obtain useful signal, through analog to digital conversion circuit, become useful digital voltage signal again, be finally presented on screen.Rotary switch during detection, selects temperature range shelves, connects temperature probe, by function conversion keys switches " degree Celsius " show with " degrees Fahrenheit ", then hand-held temperature probe handle, contacts testee by probe, and confirms that contact is reliably.After stable reading, read the temperature value of measuring on display screen.
Referring to Fig. 6,9, when carrying out phase sequence cognition, in like manner, by function conversion keys, change circuit connecting mode.Circuit of testing the phase sequence is comprised of resistance R, diode IN4003, Zener IN758A, Sheffer stroke gate G1-G4, triode 2N1121, LED.Whole piece link is comprised of phase sequence cognition circuit, amplifying circuit, current rectifying and wave filtering circuit, A/D change-over circuit etc.By phase sequence detection accessory, connect measured signal, the input signal of A, B, C three-phase is through diode and Zener, and signal is become rectangle logic-level pulses.Pulse signal is differentiated through the circuit of Sheffer stroke gate and triode composition again, and when phase sequence is correct, G4 exports a string rect.p., and pulsewidth is 2.5ns, and LED light emitting diode is bright.When phase shortage or phase sequence are when incorrect, G4 is output as zero, and LED light emitting diode does not work.The signal of exporting through phase sequence cognition circuit obtains useful signal by the processing of correction circuit, then through analog to digital conversion circuit, analog voltage signal is become to digital voltage signal, is finally presented on screen.When differentiating, function conversion keys is adjusted to phase sequence cognition state, shows screen display 000.Yellow/black/red line folder is connected respectively to three test end points of three-phase electricity, show ABC represent Huang/black/red line folder to connect power supply be positive phase sequence.If show, 00 is expressed as anti-phase or phase shortage, and red, the transposing of black line folder are surveyed once again, still shows 00, and showing has phase shortage.This function has replaced phase sequence cognition meter specially, has reduced testing apparatus in real work, makes test job convenient, quick.
Claims (3)
1. multifunctional low-voltage test instrumentation, is characterized in that comprising:
Is connected with gearshift circuit and to the analog voltage signal of gearshift circuit transmission amplify, the correction circuit of rectification, filtering;
The analog-to-digital conversion circuit that is used for receiving the analog voltage signal of described correction circuit transmission and analog voltage signal is converted into digital voltage signal;
For receiving the digital voltage signal of described analog-to-digital conversion circuit transmission the intelligent display module that digital voltage signal is processed and shown;
Be used for the current-voltage conversion circuit of measuring electric current and tested current signal being converted to analog voltage signal;
For test voltage, resistance and tested voltage resistance signal is converted to R/V, the V/V change-over circuit of analog voltage signal;
Be connected with the phase sequence cognition circuit detecting for phase sequence of phase sequence detection accessory;
For thermometric and measured signal is converted to the temperature-voltage conversion circuit of analog voltage signal, described temperature-voltage conversion circuit obtains measured signal by connecting semiconductor thermometric annex;
Described current-voltage conversion circuit, R/V, V/V change-over circuit, phase sequence cognition circuit and temperature-voltage conversion circuit are all connected with described gearshift circuit.
2. multifunctional low-voltage test instrumentation according to claim 1, is characterized in that, is provided with the pincers of the testing current for measuring current that are connected with described current-voltage conversion circuit on described test instrumentation.
3. multifunctional low-voltage test instrumentation according to claim 1, it is characterized in that, described test instrumentation is provided with positive input terminal, the negative input terminal being connected with described R/V, V/V change-over circuit, and it is a pair of to be arranged at the injection moulding test pen of described positive input terminal, negative input end sub-connection.
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| CN201310607391.9A CN103616545A (en) | 2013-11-25 | 2013-11-25 | Multifunctional low-voltage testing instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105444816A (en) * | 2015-12-31 | 2016-03-30 | 天津芯慧鸿业科技发展有限公司 | Intelligent-type multipurpose instrument |
| CN106680567A (en) * | 2015-11-10 | 2017-05-17 | 华电电力科学研究院 | Intelligent test fixture for inverter |
| CN110596475A (en) * | 2019-09-25 | 2019-12-20 | 东莞市华博精测仪表科技有限公司 | Measuring instrument with phase sequence testing function |
| CN112014610A (en) * | 2020-08-26 | 2020-12-01 | 广东电网有限责任公司梅州供电局 | Anti-electricity-stealing device applied to electric meter |
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| CN112014610A (en) * | 2020-08-26 | 2020-12-01 | 广东电网有限责任公司梅州供电局 | Anti-electricity-stealing device applied to electric meter |
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Owner name: CHUZHOU POWER SUPPLY COMPANY, STATE GRID ANHUI ELE Effective date: 20140317 Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: CHUZHOU POWER SUPPLY COMPANY, STATE GRID ANHUI ELECTRIC POWER COMPANY Effective date: 20140317 |
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Effective date of registration: 20140317 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Chuzhou Power Supply Company, State Grid Anhui Electric Power Company Address before: 239000 No. 510 Fenghuang Road, Anhui, Chuzhou Applicant before: Chuzhou Power Supply Company, State Grid Anhui Electric Power Company |
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Application publication date: 20140305 |