CN104483653A - Automatic detection system and method for intelligent electric energy meter motherboard - Google Patents

Automatic detection system and method for intelligent electric energy meter motherboard Download PDF

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Publication number
CN104483653A
CN104483653A CN201510001468.7A CN201510001468A CN104483653A CN 104483653 A CN104483653 A CN 104483653A CN 201510001468 A CN201510001468 A CN 201510001468A CN 104483653 A CN104483653 A CN 104483653A
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China
Prior art keywords
electric energy
energy meter
mainboard
automatic detection
measured
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CN201510001468.7A
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Chinese (zh)
Inventor
范成军
王玉冰
姜元镇
王鑫
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WEIFANG WUZHOU HAOTE ELECTRICAL CO Ltd
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WEIFANG WUZHOU HAOTE ELECTRICAL CO Ltd
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Priority to CN201510001468.7A priority Critical patent/CN104483653A/en
Publication of CN104483653A publication Critical patent/CN104483653A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an automatic detection system and method for an intelligent electric energy meter motherboard. The automatic detection system comprises an automatic detection device and a drive device, wherein the automatic detection device includes an automatic detection motherboard, and the automatic detection motherboard is provided with an automatic detection circuit which is in electric connection with a probe set; the probe set comprises a plurality of probes used for allowing the automatic detection motherboard to be in electric connection with the electric energy meter motherboard to be detected, all the probes are arranged on a probe plate, and the probe plate is driven by the drive device to reciprocate upwards and downwards; an electric energy meter mold cavity plate used for placement of the electric energy meter motherboard to be detected is arranged at the position, corresponding to the probe set, under the probe plate; the detection system further comprises an upper computer which performs data and command transmission with the detection motherboard. The automatic detection system can automatically detect the electric energy meter motherboard before assembly, so that the difficulty of faulted meter repairing is lowered, a lot of labor and raw materials are saved, production efficiency is improved, the production cost is reduced, and great economic benefits are brought to an enterprise.

Description

Intelligent electric energy meter mainboard automatic checkout system and detection method
Technical field
The present invention relates to ammeter Function detection technical field, particularly relate to a kind of intelligent electric energy meter mainboard automatic checkout system and detection method.
Background technology
National grid carries out after electric energy meter unifies bid, the production more and more unified standard of electric energy meter.National grid in 2013 is determined substantially with a electric energy meter hardware and software after promulgating electric energy meter new firms standards, and every block electric energy meter all needs just can dispatch from the factory through operations such as assembling, debugging, aging, detections.In current electric energy meter production run, be all after electric energy meter has been assembled, the connecting line firm welding of each parts, electric energy plate mainboard be fixed to just to carry out after in drain pan debugging, aging, detect operation, all can detect in this few procedure underproofly has bug list.Because bug list has assembled, reprocess very difficult, need the table assembled to disassemble again to come, thus cause artificial and raw-material waste in a large number, also reduce production efficiency, improve production cost.
Summary of the invention
The present invention first object is to provide a kind of intelligent electric energy meter mainboard automatic checkout system, this detection system automatically can detect the various functions of electric energy meter mainboard before electric energy meter has been assembled, reduce the difficulty that bug list is reprocessed, save a large amount of artificial and starting material, improve production efficiency, reduce production cost, for enterprise brings very large economic benefit.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of intelligent electric energy meter mainboard automatic checkout system comprises automatic detection device and drive unit, described automatic detection device comprises and automatically detects mainboard, described automatic detection mainboard is provided with automatic detection circuit, and described automatic detection circuit is electrically connected with probe groups; Described probe groups comprises some probes for being electrically connected described automatic detection mainboard and electric energy meter mainboard to be measured, and each described probe is all located on a probe card, and described probe card is driven by described drive unit and moves back and forth up and down; Immediately below described probe card, the position of corresponding described probe groups is provided with the electric energy meter die cavity plate for placing described electric energy meter mainboard to be measured; Described detection system also comprises the host computer carrying out data and command with described automatic detection mainboard.
Optimal way is, described automatic detection circuit comprises MCU, the optocoupler testing circuit be electrically connected with described MCU, A/D change-over circuit, 485 communicating circuits and analog voltage current input circuit.
Optimal way is, described detection system also comprises the microampere meter for detecting described electric energy meter backup battery power consumption to be measured, and described microampere meter is electrically connected with described automatic detection circuit.
Optimal way is, described electric energy meter die cavity plate horizontally there are three electric energy meter die cavitys, described host computer is electrically connected with one scan rifle, and described scanner is separately positioned on electric energy meter mainboard scan code to be measured in three described electric energy meter die cavitys and by the numbered transmission of electric energy meter mainboard each described to be measured that scans to described host computer for scanning.
Optimal way is, described automatic checkout system also comprises the housing of a side opening, and described automatic detection mainboard is located at the bottom in described housing, and described electric energy meter die cavity is located at the top of described automatic detection mainboard; Described drive unit is arranged on the top of described housing, and is connected with described probe card by a pull bar; Described microampere meter is arranged on the top of described opening, described housing is also provided with the button for starting and stop described drive unit.
Optimal way is, the described housing be positioned at above described probe card is also provided with a bearing plate, and described bearing plate is fixedly connected with by some vertically disposed columns with described probe card, and described pull bar is fixed on described bearing plate.
Optimal way is, some vertically disposed guideposts are provided with between the top of described bearing plate and described housing, the lower end of guidepost described in every root is fixed on described bearing plate, the upper end of guidepost described in every root passes from the pilot hole the top board of described housing, and described guidepost is constrained in described pilot hole all the time.
Optimal way is, guidepost described in every root is equipped with one and moves up the limited block of distance for limiting described bearing plate.
Optimal way is, described drive unit is cylinder, and described cylinder is communicated with air valve by connecting tracheae, and described air valve is located at the bottom of described housing; The break-make of air valve described in described button control.
The present invention second object is the detection method providing a kind of intelligent electric energy meter mainboard automatic checkout system, this detection method makes the detection of electric energy meter mainboard automatically, fast and accurately carry out, thus reduce the labour intensity of workman, reduce the rejection rate of electric energy meter in finishing operations, improve the product qualified rate of electric energy meter product.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of detection method of intelligent electric energy meter mainboard automatic checkout system, comprises the following steps:
S10: described electric energy meter mainboard to be measured is placed in described electric energy meter die cavity, controlling described drive unit drives described probe card to move down, and each described probe is contacted with each check point on described electric energy meter mainboard to be measured the electrical connection realized between described automatic detection circuit and described electric energy meter mainboard to be measured;
S20: the correlation parameter of electric energy meter is downloaded to described electric energy meter mainboard to be measured by 485 communicating circuits by described automatic detection circuit;
S30: described automatic detection circuit detects the plurality of voltages of described electric energy meter mainboard to be measured;
S40: to described electric energy meter mainboard input analog voltage to be measured and electric current, and detect whether have output of pulse signal and output frequency by metrical pulse output terminal, complete the detection to described electric energy meter mainboard function of measuring;
S50: described automatic detection circuit controls disconnection and the adhesive of described electric energy meter mainboard internal relay circuit to be measured, and whether the control relay circuit detecting described electric energy meter mainboard normally works;
S60: whether described automatic detection circuit detects described electric energy meter mainboard clock second and export normal, and does cycle detection judgement;
S70: the battery power consumption under the described electric energy meter mainboard to be measured of described automatic detection circuit detection after electricity;
S80: described host computer sends full screen display order, and whether testing staff observes liquid crystal display scarce stroke;
S90: described host computer has carried out the test to the eeprom circuit on described electric energy meter mainboard and ESAM circuit by data line reading command;
S100: control described drive unit and described probe card is moved up make each described probe depart from described electric energy meter mainboard to be measured, the electric energy meter mainboard through detecting is taken off, thus the overall process completing that electric energy meter mainboard detects.
After adopting technique scheme, the invention has the beneficial effects as follows: because intelligent electric energy meter mainboard automatic checkout system of the present invention comprises automatic detection device and drive unit, wherein automatic detection device comprises and automatically detects mainboard, and this automatic detection circuit automatically detected on mainboard is electrically connected with electric energy meter mainboard to be measured by probe.Therefore the present invention can detect the various functions of electric energy meter mainboard before electric energy meter mainboard is not installed to housing, can get rid of the mainboard of fault electric energy meter in advance, reduce the difficulty that bug list is reprocessed, save a large amount of artificial and starting material, improve production efficiency, reduce production cost, for enterprise brings very large economic benefit.Drive unit of the present invention drives and probe card can be driven to move back and forth up and down simultaneously, realizes being electrically connected auto switching between probe with electric energy meter mainboard; Thus reduce the labour intensity of workman.
Due to electric energy meter die cavity plate horizontally having three electric energy meter die cavitys, make the detection efficiency that invention increases detection system; The scanner be simultaneously electrically connected with host computer, the electric energy meter mainboard scan code to be measured be separately positioned in three electric energy meter die cavitys can be scanned, and can by the numbered transmission of electric energy meter mainboard each to be measured that scans to host computer, this structure enables the present invention be remembered respectively by each Detection Information of three electric energy meter mainboards to be measured, uses in order to subsequent handling; Also the differentiation of three pieces of electric energy meter mainboards to be measured is convenient to.
Owing to being provided with some vertically disposed guideposts between bearing plate and the top of housing, the lower end of every root guidepost is all fixed on bearing plate, upper end passes from the pilot hole the top board of housing, and guidepost is constrained in pilot hole all the time, this structure makes bearing plate can not produce skew in the horizontal direction, thus probe is contacted with check point corresponding on electric energy meter mainboard to be measured accurately.
In sum, intelligent electric energy meter mainboard automatic checkout system of the present invention and detection method, solve the technical matterss such as the inconvenient maintenance caused after becoming bug list after the assembling of electric energy meter mainboard in prior art.The present invention can detect the electric energy meter mainboard before assembling automatically, reduces the difficulty that bug list is reprocessed, and saves a large amount of artificial and starting material, improves production efficiency, reduce production cost, for enterprise brings very large economic benefit.
Accompanying drawing explanation
Fig. 1 is the front view of intelligent electric energy meter mainboard automatic checkout system of the present invention;
Fig. 2 is the right view of intelligent electric energy meter mainboard automatic checkout system of the present invention;
Fig. 3 is the process flow diagram of the detection method of intelligent electric energy meter mainboard automatic checkout system of the present invention;
Fig. 4 is the process flow diagram of the electric energy meter Performance Detection of intelligent electric energy meter mainboard automatic checkout system of the present invention;
In figure: 1-housing, 10-pilot hole, 2-bearing plate, 3-probe card, 30-limited block, 4-guidepost, 5-column, 60-cylinder, 61-probe, 62-pull bar, 63-air valve start button, 64-air valve, 65-air valve X button, 7-microampere meter, 8-electric energy meter die cavity plate, 9-automatically detect mainboard.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As depicted in figs. 1 and 2, a kind of intelligent electric energy meter mainboard automatic checkout system, comprise automatic detection device and drive unit, also comprise the housing 1 of a front openings, the bearing plate 2 that one piece of horizontal cross is arranged is provided with below the end face of this housing 1, a vertically disposed pull bar 62 is provided with above this bearing plate 2, the top of this pull bar 62 is connected with drive unit, drive unit is cylinder 60, pull bar 62 is connected with the piston rod of cylinder 60, this cylinder 60 is located at the end face of housing 1, and optimal way is the outside that cylinder 60 is located at housing 1 end face.Wherein cylinder 60 is communicated with air valve 64 by connecting tracheae, this air valve 64 is located at the bottom of housing 1, and the control knob of this air valve 64 comprises air valve start button 63 and air valve X button 65, air valve start button 63 and air valve X button 65 are all located at before housing 1.Automatic detection device comprises detection mainboard 9 automatically, and automatically detect mainboard 9 and be provided with automatic detection circuit, automatic detection circuit is electrically connected with probe groups; Probe groups comprises some probes 61 for being electrically connected automatic detection circuit and electric energy meter mainboard to be measured, each probe 61 is all located on a probe card 3, probe card 3 is arranged on the below of bearing plate 2, is linked together between this probe card 3 and bearing plate 2 by many root posts 5.Immediately below probe card 3, be provided with electric energy meter die cavity plate 8, the below of this electric energy meter die cavity plate 8 is provided with detects mainboard 9 automatically.
Automatic detection circuit on the automatic detection mainboard 9 of the present embodiment comprises MCU, and and the optocoupler testing circuit of MCU electrical connection, A/D change-over circuit, 485 communicating circuits and analog voltage current input circuit, the wherein preferred R5F212BC single-chip microcomputer of MCU.Described detection system also comprises the host computer carrying out data and command with MCU.
Also be provided with relay in the housing 1 of the present embodiment, this relay is electrically connected with automatic detection circuit, for controlling whether powering on of power supply and electric energy meter mainboard to be measured.
The detection system of the present embodiment, in order to improve detection efficiency, detects three pieces of electric energy meter mainboards simultaneously.To achieve these goals, the electric energy meter die cavity plate 8 of the present embodiment horizontally has three pieces of electric energy meter die cavitys, in three pieces of electric energy meter die cavitys, place one piece of electric energy meter mainboard to be measured respectively, and every block electric energy meter mainboard to be measured is provided with a scan code.This scan code is scanned by a scanner, and the information of scanning is passed to host computer by this scanner, is distinguished by three pieces of electric energy meter mainboards to be measured according to this scan code by host computer.In order to improve detection efficiency, probe card 3 is also provided with three groups of probe groups simultaneously, three probe groups are corresponding with three electric energy meter mainboards to be measured to be arranged.Also be provided with three pieces of microampere meters, 7, three pieces of microampere meters 7 at the overthe openings of housing 1 to be all electrically connected with automatic detection circuit, the numerical value on three pieces of microampere meters 7 is for reacting the power consumption value of three pieces of electric energy meter mainboard reserve batteries.
The present embodiment, in order to make bearing plate 2 when driving probe card 3 to move, making the motion track of probe card 3 arbitrarily offset, being provided with four symmetrically arranged guideposts 4 on bearing plate 2.The lower end of every root guidepost 4 is all fixed on bearing plate 2, and upper end all passes from the pilot hole 10 housing 1 top board, and guidepost 4 is constrained in corresponding pilot hole 10 all the time, thus makes guidepost 4 realize the function of guide-localization.Therefore bearing plate 2 is under the restriction of four guideposts 4, can not arbitrarily offset, thus ensure that each probe 61 on probe card 3 can contact with the check point on electric energy meter mainboard to be measured accurately, and then ensure that the accuracy of testing result.
The danger that the present embodiment causes to limit bearing plate 2 and moving up excessively, every root guidepost 4 is equipped with one piece of limited block 30.When bearing plate 2 is hauled by pull bar 62 height moving to limited block 30 place, can block for limited piece 30.
During the work of this detection system, host computer is activated, and is placed on electric energy meter die cavity plate 8 by three pieces of electric energy meter mainboards to be measured.Press air valve start button 63, air valve 64 is communicated with cylinder 60, and piston rod is moved down under the effect of air valve 64, and the mobile pull bar 62 that drives of this piston rod is along with moving down.And pull bar 62 is when moving down, bearing plate 2 is pulled to move down along four guideposts 4, because the effect probe card 3 of each column 5 also moves down.When cylinder 60 stops action, each probe 61 of three groups of probe groups on probe card 3 with immediately below the check point of electric energy meter mainboard to be measured contact, achieve the object that three pieces of electric energy meter mainboards to be measured are electrically connected respectively respectively at automatic detection circuit.After electric energy meter mainboard to be measured is connected with automatic detection circuit by probe 61, automatic detection circuit starts the detection three pieces of electric energy meter mainboards being carried out to each performance.Simultaneously host computer also carries out the detection of some performance to three pieces of electric energy meter mainboards by data line, and the information that finally each electric energy meter mainboard can also be detected and its respective corresponding storing of scan code, use in order to subsequent handling.
Three pieces of electric energy meter die cavitys in addition on electric energy meter die cavity plate 8 are uniformly distributed, three groups of probe groups on probe card 3 are uniformly distributed, column 5 between probe card 3 and bearing plate 2 is arranged according to the position of three-phase probe groups, four guideposts 4 on bearing plate 2 are evenly arranged, above-mentioned each evenly structure is set, drive unit stabilized driving probe card 3 of the present invention is moved up and down.
As shown in Figure 3 and Figure 4, the detection method of the automatic checkout system of the intelligent electric energy meter mainboard of the present embodiment, is specially:
S10: three pieces of electric energy meter mainboards to be measured are placed in three pieces of electric energy meter die cavitys, then press air valve start button, allow air valve be communicated with cylinder, the piston rod of cylinder is moved down, finally make pull bar haul bearing plate and move down together with probe card.When cylinder stops action, each probe of three groups of probe groups contacts with each check point of three pieces of electric energy meter mainboards to be measured, achieves the electrical connection between automatic detection circuit and three pieces of electric energy meter mainboards to be measured.Then automatic detection circuit pilot relay closes, to three pieces of electric energy meter mainboard energisings, now also charged on each probe 61, therefore please misapply hand touching during operation.
S20: the correlation parameter of electric energy meter is downloaded to three pieces of electric energy meter mainboards to be measured by 485 communicating circuits by automatic detection circuit.
S30: automatic detection circuit detects and utilizes A/D change-over circuit to complete the detection of the plurality of voltages of three pieces of electric energy meter mainboards to be measured.
S40: automatic detection circuit is closed by pilot relay, by analog voltage, electric current input electric energy meter mainboard, and detects whether have output of pulse signal and output frequency by metrical pulse output terminal, completes the detection to three pieces of electric energy meter mainboard function of measuring.
S50: automatic detection circuit controls disconnection and the adhesive of three pieces of electric energy meter mainboard internal relay circuit to be measured by 485 communicating circuits, utilize the optocoupler testing circuit of automatic detection circuit inside, whether the control relay circuit detecting three pieces of electric energy meter mainboards to be measured normally works.
S60: automatically detect mainboard and whether normally to detect three pieces of electric energy meter mainboard clocks second outputs to be measured by optocoupler metering circuit, and do cycle detection judgement.
S70: automatic detection circuit detects the battery power consumption under three pieces of electric energy meter mainboards to be measured after electricity by three pieces of microampere meters.
S80: host computer sends full screen display order, and whether the liquid crystal display that testing staff observes on three pieces of electric energy meter mainboards to be measured has scarce stroke.
S90: host computer has carried out the test to the eeprom circuit on three pieces of electric energy meter mainboards to be measured and ESAM circuit by data line reading command;
S100: press air valve X button, air valve active cylinder, piston rod is moved up, make pull bar haul bearing plate to move up together with probe card, each probe and three pieces of electric energy meter mainboards to be measured are departed from, now probe is not charged, is finally taken off by three pieces of electric energy meter mainboards to be measured through detecting, thus completes the overall process of electric energy meter mainboard detection.If in three pieces of electric energy meter mainboards arbitrary piece defective, return maintenance, re-use this detection system after maintenance again and detect, after qualified, proceed to next process again.
From the above, the present invention can detect each performance of the electric energy meter mainboard before assembling, can be selected by fault electric energy meter mainboard before assembling, sent for maintenance.Therefore present invention reduces the difficulty that bug list is reprocessed, save a large amount of artificial and starting material, improve production efficiency, reduce production cost, for enterprise brings very large economic benefit.
The above preferred embodiment of the present invention; not in order to limit the present invention; all any amendments done within the spirit and principles in the present invention, etc. the improvement etc. of same intelligent electric energy meter mainboard automatic checkout system structure, all should be included within protection scope of the present invention.

Claims (10)

1. intelligent electric energy meter mainboard automatic checkout system, it is characterized in that, comprise automatic detection device and drive unit, described automatic detection device comprises and automatically detects mainboard, described automatic detection mainboard is provided with automatic detection circuit, and described automatic detection circuit is electrically connected with probe groups; Described probe groups comprises some probes for being electrically connected described automatic detection mainboard and electric energy meter mainboard to be measured, and each described probe is all located on a probe card, and described probe card is driven by described drive unit and moves back and forth up and down; Immediately below described probe card, the position of corresponding described probe groups is provided with the electric energy meter die cavity plate for placing described electric energy meter mainboard to be measured; Described detection system also comprises the host computer carrying out data and command with described automatic detection mainboard.
2. intelligent electric energy meter mainboard automatic checkout system according to claim 1, it is characterized in that, described automatic detection circuit comprises MCU, the optocoupler testing circuit be electrically connected with described MCU, A/D change-over circuit, 485 communicating circuits and analog voltage current input circuit.
3. intelligent electric energy meter mainboard automatic checkout system according to claim 2, is characterized in that, described detection system also comprises the microampere meter for detecting described electric energy meter backup battery power consumption to be measured, and described microampere meter is electrically connected with described automatic detection circuit.
4. intelligent electric energy meter mainboard automatic checkout system according to claim 3, it is characterized in that, described electric energy meter die cavity plate horizontally there are three electric energy meter die cavitys, described host computer is electrically connected with one scan rifle, and described scanner is separately positioned on electric energy meter mainboard scan code to be measured in three described electric energy meter die cavitys and by the numbered transmission of electric energy meter mainboard each described to be measured that scans to described host computer for scanning.
5. the intelligent electric energy meter mainboard automatic checkout system according to any one of Claims 1-4 claim, it is characterized in that, described automatic checkout system also comprises the housing of a side opening, described automatic detection mainboard is located at the bottom in described housing, and described electric energy meter die cavity is located at the top of described automatic detection mainboard; Described drive unit is arranged on the top of described housing, and is connected with described probe card by a pull bar; Described microampere meter is arranged on the top of described opening, described housing is also provided with the button for starting and stop described drive unit.
6. intelligent electric energy meter mainboard automatic checkout system according to claim 5, it is characterized in that, the described housing be positioned at above described probe card is also provided with a bearing plate, described bearing plate is fixedly connected with by some vertically disposed columns with described probe card, and described pull bar is fixed on described bearing plate.
7. intelligent electric energy meter mainboard automatic checkout system according to claim 6, it is characterized in that, some vertically disposed guideposts are provided with between the top of described bearing plate and described housing, the lower end of guidepost described in every root is fixed on described bearing plate, the upper end of guidepost described in every root passes from the pilot hole the top board of described housing, and described guidepost is constrained in described pilot hole all the time.
8. intelligent electric energy meter mainboard automatic checkout system according to claim 7, is characterized in that, guidepost described in every root is equipped with one and moves up the limited block of distance for limiting described bearing plate.
9. intelligent electric energy meter mainboard automatic checkout system according to claim 8, is characterized in that, described drive unit is cylinder, and described cylinder is communicated with air valve by connecting tracheae, and described air valve is located at the bottom of described housing; The break-make of air valve described in described button control.
10. the detection method of the intelligent electric energy meter mainboard automatic checkout system described in the arbitrary claim of claim 1 to 9, is characterized in that, comprise the following steps:
S10: described electric energy meter mainboard to be measured is placed in described electric energy meter die cavity, controlling described drive unit drives described probe card to move down, and each described probe is contacted with each check point on described electric energy meter mainboard to be measured the electrical connection realized between described automatic detection circuit and described electric energy meter mainboard to be measured;
S20: the correlation parameter of electric energy meter is downloaded to described electric energy meter mainboard to be measured by 485 communicating circuits by described automatic detection circuit;
S30: described automatic detection circuit detects the plurality of voltages of described electric energy meter mainboard to be measured;
S40: to described electric energy meter mainboard input analog voltage to be measured and electric current, and detect whether have output of pulse signal and output frequency by metrical pulse output terminal, complete the detection to described electric energy meter mainboard function of measuring;
S50: described automatic detection circuit controls disconnection and the adhesive of described electric energy meter mainboard internal relay circuit to be measured, and whether the control relay circuit detecting described electric energy meter mainboard normally works;
S60: whether described automatic detection circuit detects described electric energy meter mainboard clock second and export normal, and does cycle detection judgement;
S70: the battery power consumption under the described electric energy meter mainboard to be measured of described automatic detection circuit detection after electricity;
S80: described host computer sends full screen display order, and whether testing staff observes liquid crystal display scarce stroke;
S90: described host computer has carried out the test to the eeprom circuit on described electric energy meter mainboard and ESAM circuit by data line reading command;
S100: control described drive unit and described probe card is moved up make each described probe depart from described electric energy meter mainboard to be measured, the electric energy meter mainboard through detecting is taken off, thus the overall process completing that electric energy meter mainboard detects.
CN201510001468.7A 2015-01-04 2015-01-04 Automatic detection system and method for intelligent electric energy meter motherboard Pending CN104483653A (en)

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CN110208729A (en) * 2019-06-27 2019-09-06 南方电网科学研究院有限责任公司 The key combined floodgate detection method of electric energy meter

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