CN107450043A - Communication module of intelligent electric energy meter interface load capacity test device and method - Google Patents

Communication module of intelligent electric energy meter interface load capacity test device and method Download PDF

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Publication number
CN107450043A
CN107450043A CN201710604020.3A CN201710604020A CN107450043A CN 107450043 A CN107450043 A CN 107450043A CN 201710604020 A CN201710604020 A CN 201710604020A CN 107450043 A CN107450043 A CN 107450043A
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China
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resistance
msub
triode
mrow
energy meter
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Inventor
朱亮
李敏
杨爱超
谢三军
胡涛
吴宇
刘见
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Priority to CN201710604020.3A priority Critical patent/CN107450043A/en
Publication of CN107450043A publication Critical patent/CN107450043A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The invention discloses a kind of communication module of intelligent electric energy meter interface load capacity test device, by resistance R1, resistance R2, resistance R3, triode Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display composition.The invention provides a kind of communication module of intelligent electric energy meter interface load capacity method of testing, and according to the type of tested electric energy meter, triode Q is controlled by control unit1Base stage and emitter stage between voltage, make to flow through triode Q1Electric current and setting value approximately equal；Device, which can also monitor, flows through triode Q1Actual current value id, according to obtained communication module interface VccMagnitude of voltage V between end and GND0, whether the load capacity that automatic decision is tested electric energy meter communication module interface meet to require.

Description

Communication module of intelligent electric energy meter interface load capacity test device and method
Technical field
The invention belongs to Electric Energy Metering Technology field, is carried in particular to a kind of communication module of intelligent electric energy meter interface band Aptitude tests device and method.
Background technology
Important component of the intelligent electric energy meter as intelligent grid, has obtained more and more extensive application.National grid Company has formulated a series of company standard, and requirement is proposed to the performance of electric energy meter.The communication of communication module and electric energy meter connects Mouth connection is to realize carrier communication, to verify communication interface load capacity, standard regulation：The communication module interface of single-phase electric energy meter Access 96 Ω resistance, VCCPort voltage value should be ± 12V ± 1V, and current range is 0mA~125mA；The communication of three-phase electric energy meter Module interface accesses 30 Ω resistance, VCCPort voltage value should be ± 12V ± 1V, and current range is 0mA~400mA.
It is 96 Ω (single-phase electric energies that traditional detection method need to manually access resistance in tested electric energy meter communication module interface Table) or 30 Ω (three-phase electric energy meter) purely resistive resistance, its required precision be ± 5%.During test, according to the type of electric energy meter, The resistance of respective resistance values is changed, by voltage and current value corresponding to measurement to judge that the band of tested table communication module interface carries energy Whether power meets standard requirement.The method needs artificial wiring and changes resistance, can be tight when detected electric energy meter quantity is larger Ghost image rings detection efficiency；The resistance that can also result in resistance in test the problem of resistance heating shifts, and influences test knot The accuracy of fruit.
The content of the invention
The invention aims to overcome the deficiencies in the prior art, there is provided a kind of communication module of intelligent electric energy meter interface Load capacity test device and method, according to the type of tested electric energy meter, adjust automatically obtains V to adapt to detection demandccEnd electricity Pressure, realizes the automatic test of electric energy meter communication module interface load capacity.
In order to solve the above-mentioned technical problem, the present invention is realized using following technical scheme：
A kind of communication module of intelligent electric energy meter interface load capacity test device, including：Resistance R1, resistance R2, resistance R3、 Triode Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display Device；
Resistance R1With resistance R2Series connection, then the both ends V with electric energy meter communication module interface respectivelyCCEnd connects with GND；Three Pole pipe Q1Colelctor electrode and communication module interface VCCEnd connection, triode Q1Emitter stage through resistance R1With relay J1Ground connection；Electricity Hinder R2An input of the voltage at both ends as A/D converter, resistance R3The voltage at both ends as A/D converter another is defeated Enter；The output end of A/D converter is connected with DSP inputs, and DSP output end is connected with D/A converter and Access Control unit An input, resistance R3Another input of the voltage signal at both ends as control unit；Temperature sensor exports and DSP Connection, DSP output ends and triode Q2Ground level is connected, triode Q2Colelctor electrode and relay J1Coil be connected, triode Q2Hair Emitter grounding；Display is connected with DSP, to show actual current value idAnd communication module interface VCCThe magnitude of voltage V at end0。
Described control unit, including：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplification Device A1With amplifier A2。
Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance R7 Both ends respectively with amplifier A1End of oppisite phase connected with output end；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3Two The voltage signal at end is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output end is through resistance R8With amplifier A2It is anti-phase End connection；Amplifier A2End of oppisite phase ground connection；Resistance R9With electric capacity C1Series connection, both ends respectively with amplifier A2End of oppisite phase and defeated Go out end connection；Amplifier A2Output end through resistance R10With triode Q1Base stage connection.
Based on above-mentioned communication module of intelligent electric energy meter interface load capacity test device, a kind of intelligent electric energy meter communication mould Block interface load capacity method of testing：DSP determines setting value according to the type of tested electric energy meter, is exported by DSP and is changed through D/A Device is converted into analog signal, an input signal as control unit；Resistance R3The voltage at both ends, which reflects, flows through triode Q1 Electric current, another input signal as control unit；Control unit is compared to this two output signals, according to comparing As a result, triode Q is controlled by control unit1Base stage and emitter stage between voltage, make to flow through triode Q1Electric current with setting Definite value is equal；Power taking hinders R3The control source at both ends flows through triode Q to A/D converter by what is obtained1Electric current be converted into counting Word signal, handled by DSP and specific current value value i is shown by displayd；Resistance R1With resistance R2Series connection, both ends respectively with electric energy The V of communication module interface in tableCCEnd connects with GND ends, power taking resistance R2The control source at both ends is to A/D converter, by what is obtained Triode Q1The voltage conversion at collector and emitter both ends is handled by DSP and shown specifically by display into data signal Magnitude of voltage V0, can determine whether electric energy meter communication module interface load capacity meets to require according to this value；When what is monitored flows through Triode Q1Current value idMore than triode Q1The temperature that maximum allowed current or temperature sensor detect exceedes predetermined value When, DSP sends control signal, passes through triode Q2Control relay J1Coil, make relay J1Disconnect, play overprotection.
The present invention uses the proportional plus integral control of close loop negative feedback, realizes zero steady state error control.Control unit includes subtraction electricity Road and proportional integral circuit.Resistance R4, resistance R5, resistance R6, resistance R7With amplifier A2Form differential type subtraction circuit, realization pair Given value of current valueWith current actual value idSubtract each other；Amplifier A2Export V1With given value of current valueWith actual value idHave with ShiShimonoseki System：
As resistor satisfied R4=R5=R6=R7When, above formula can be reduced to：
Resistance R8, resistance R9, electric capacity C1With amplifier A1Composition integrating circuit, proportional integral circuit is by proportional component It is formed by stacking with integral element two parts；Output voltage V of the proportional component to subtraction circuit1It is amplified, amplification coefficient Kp, Selection K can be set according to system optimalpValue；Output voltage V of the integral element to subtraction circuit1Integration；If voltage V1Value not Be approximately zero, then electric capacity C1Constantly charging, to output voltage V1Integration, until amplifier A2Output voltage V2Reach limit value, so as to Realize the zero steady state error control of electric current.
Amplifier A1Export V2With input voltage V1Relation is as follows：
The beneficial effects of the invention are as follows：The present invention provides a kind of communication module of intelligent electric energy meter interface load capacity test dress Put, according to the type of tested electric energy meter, triode Q is controlled by control unit1Base stage and emitter stage between voltage, make stream Cross triode Q1Electric current and setting value approximately equal；Device, which can also monitor, flows through triode Q1Actual current value id, according to Obtained communication module interface VccMagnitude of voltage V between end and GND0, the band of the tested electric energy meter communication module interface of automatic decision Whether loading capability, which meets, requires.
Brief description of the drawings
Fig. 1 is the principle of device schematic diagram of the present invention；
Fig. 2 is the flow chart for realizing automatic detection of the present invention.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
It is the principle of device schematic diagram of the present invention shown in Fig. 1, a kind of communication module of intelligent electric energy meter interface load capacity is surveyed Trial assembly is put, including：Resistance R1, resistance R2, resistance R3, triode Q1, triode Q2, relay J1, A/D converter, TEMP Device, DSP, D/A converter, control unit and display.Resistance R1Connected with resistance R2, then both ends communicate with electric energy meter respectively The V of module interfaceCCEnd connects with GND；Triode Q1Colelctor electrode and communication module interface VCCEnd connection, triode Q1Transmitting Pole is through resistance R1With relay J1Ground connection；Resistance R2An input of the voltage at both ends as A/D converter, resistance R3Both ends Another input of voltage as A/D converter；The output end of A/D converter is connected with DSP inputs, DSP output end with D/A converter connection and an input of Access Control unit, the voltage signal at resistance R3 both ends is as the another of control unit One input；Temperature sensor output is connected with DSP, DSP output ends and triode Q2Ground level is connected, triode Q2Colelctor electrode with Relay J1Coil be connected, triode Q2Grounded emitter；Display is connected with DSP, to show actual current value idAnd communication Module interface VCCThe magnitude of voltage V at end0。
During test, AC power output is identical with being tested the reference voltage of electric energy meter, and power supply is provided for ammeter.When tested table For single-phase electric energy meter when, DSP determines that current setting value is 125mA；When tested table is three-phase electric energy meter, DSP determines that electric current is set Definite value is 400mA；Exported by DSP and be converted into analog signal through D/A converter, an input signal as control unit； Resistance R3The voltage at both ends, which reflects, flows through triode Q1Electric current, another input signal as control unit；Control unit Proportional plus integral control is carried out after subtracting each other to the two output signals, triode Q is controlled by control unit1Base stage and hair Voltage between emitter-base bandgap grading, make to flow through triode Q1Electric current it is equal with setting value, realize the zero steady state error control of electric current；Power taking hinders R3 The control source at both ends flows through triode Q to A/D converter by what is obtained1Electric current be converted into data signal, by DSP processing And concrete numerical value i is shown by displayd；Resistance R1With resistance R2Series connection, the both ends V with communication interface in electric energy meter respectivelyccEnd and GND ends connect, power taking resistance R2The control source at both ends is to A/D converter, the triode Q1 collector and emitters two that will be obtained Terminal voltage is converted into data signal, is handled by DSP and shows concrete numerical value V by display0；Work as V0In the range of ± 12V ± 1V When, then it is tested the requirement that table meets standard；Work as V0When not in the range of ± 12V ± 1V, then the requirement that table is unsatisfactory for standard is tested； When what is monitored flows through triode Q1Current value idMore than its maximum allowed current or temperature sensor monitors to temperature exceed During preset value (such as 70 DEG C), DSP sends control signal, passes through triode Q2Control relay J1Coil, make relay J1It is disconnected Open, play excessively stream and overheat protector effect.
Control unit includes：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplifier A1 With amplifier A2.Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance R7Both ends respectively with amplifier A1End of oppisite phase connected with output end；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3 The voltage signal at both ends is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output end is through resistance R8With amplifier A2Instead Phase end connects；Amplifier A2End of oppisite phase ground connection；Resistance R9With electric capacity C1Series connection, both ends respectively with amplifier A2End of oppisite phase and Output end connects；Amplifier A2Output end through resistance R10With triode Q1Base stage connection.
Resistance R4, resistance R5, resistance R6, resistance R7With amplifier A2Differential type subtraction circuit is formed, is realized to given value of current ValueWith current actual value idSubtract each other；Amplifier A2Export V1With given value of current valueWith actual value idThere is following relation：
As resistor satisfied R4=R5=R6=R7When, above formula can be reduced to：
Resistance R8, resistance R9, electric capacity C1With amplifier A1Composition integrating circuit, proportional integral circuit is by proportional component It is formed by stacking with integral element two parts；Output voltage V of the proportional component to subtraction circuit1It is amplified, amplification coefficient Kp, Selection K can be set according to system optimalpValue；Output voltage V of the integral element to subtraction circuit1Integration；If voltage V1Value not Be approximately zero, then electric capacity C1Constantly charging, to output voltage V1Integration, until amplifier A2Output voltage V2Reach limit value, so as to Realize the zero steady state error control of electric current.
Amplifier A1Export V2With input voltage V1Relation is as follows：
Fig. 2 is the flow chart for realizing automatic detection of the present invention, detects the step of intelligent electric energy meter communication interface load capacity It is rapid as follows：
Step 1：Power-on, test start；
Step 2：According to tested electric energy meter type, setting electric current value initial value；
Step 3：Detection resistance R3Voltage, obtain flowing through triode Q1Electric current；
Step 4：Temperature sensor detects power device temperature；
Step 5：Detection temperature exceedes preset temperature, system alarm, and test is interrupted；Detection temperature is less than preset value, enters Step 7；
Step 6：Detection electric current exceedes triode Q1Maximum allowed current, system alarm, test are interrupted；Detection electric current is less than Triode Q1Maximum allowed current, into step 7；
Step 7：DSP compares current setting valueWith current actual value id；
Step 8：Current setting valueWith current actual value idWhen unequal, into step 9；Current setting valueWith electric current Actual value idWhen equal, into step 11；
Step 9：Passing ratio integration control regulation triode Q1Voltage between base terminal and emitter stage,
Step 10：Return to step 3, until actual current idWith setting valueApproximately equal；
Step 11：Detect electric energy meter communication module interface VCCVoltage V between end and GND0；
Step 12：DSP judges V0Whether in the range of ± 12 ± 1V, test result is provided：As equal, then tested electricity is judged Can table satisfaction requirement；If not in the range of, then judged, tested electric energy meter is unsatisfactory for requiring；
Step 13：Test terminates.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention provides a kind of communication module of intelligent electric energy meter and connect Mouth load capacity test device, according to the type of tested electric energy meter, pass through control unit and control triode Q1Base stage and transmitting Voltage between pole, make to flow through triode Q1Electric current and setting value approximately equal；Device, which can also monitor, flows through triode Q1's Current value idWith the temperature of power device, there is protective effect；By obtained VCCMagnitude of voltage V between end and GND0, sentence automatically Whether the load capacity of disconnected tested electric energy meter communication module interface meets to require.
The undeclared part being related in the present invention is same as the prior art or is realized using prior art.

Claims (7)

1. a kind of communication module of intelligent electric energy meter interface load capacity test device, including：Resistance R1, resistance R2, resistance R3, three Pole pipe Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display； It is characterized in that：Resistance R1With resistance R2Series connection, the both ends V with electric energy meter communication module interface respectivelyCCEnd connects with GND；Three poles Pipe Q1Colelctor electrode and communication module interface VCCEnd connection, triode Q1Emitter stage through resistance R1With relay J1Ground connection；Resistance R2An input of the voltage at both ends as A/D converter, resistance R3Another input of the voltage at both ends as A/D converter； The output end of A/D converter is connected with DSP inputs, and DSP output end is connected the one of simultaneously Access Control unit with D/A converter Individual input, resistance R3Another input of the voltage signal at both ends as control unit；Temperature sensor exports to be connected with DSP Connect, DSP output ends and triode Q2Ground level is connected, triode Q2Colelctor electrode and relay J1Coil be connected, triode Q2Transmitting Pole is grounded；Display is connected with DSP, to show actual current value idAnd communication module interface VCCThe magnitude of voltage V at end0。
2. communication module of intelligent electric energy meter interface load capacity test device as claimed in claim 1, it is characterized in that：The control Unit processed includes：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplifier A1With amplifier A2； Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance R7Both ends point Not with amplifier A1End of oppisite phase connected with output end；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3The voltage at both ends Signal is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output end is through resistance R8With amplifier A2End of oppisite phase connects； Amplifier A2End of oppisite phase ground connection；Resistance R9With electric capacity C1Series connection, both ends respectively with amplifier A2End of oppisite phase and output end connect Connect；Amplifier A2Output end through resistance R10With triode Q1Base stage connection.
3. a kind of communication module of intelligent electric energy meter interface load capacity method of testing, it is characterized in that：Based on the institute of claim 1 or 2 The communication module of intelligent electric energy meter interface load capacity test device stated, DSP determine setting value according to the type of tested electric energy meter, Exported by DSP and be converted into analog signal through D/A converter, an input signal as control unit；Resistance R3Both ends Voltage, which reflects, flows through triode Q1Electric current, another input signal as control unit；Control unit is defeated to this two Go out signal to be compared, according to comparative result, triode Q is controlled by control unit1Base stage and emitter stage between voltage, Make to flow through triode Q1Electric current it is equal with setting value；Power taking hinders R3The control source at both ends is to A/D converter, the stream that will be obtained Cross triode Q1Electric current be converted into data signal, by DSP handle and specific current value value i is shown by displayd；Resistance R1With Resistance R2Series connection, the both ends V with communication module interface in electric energy meter respectivelyCCEnd connects with GND ends, power taking resistance R2The voltage at both ends A/D converter is input to, the triode Q that will be obtained1The voltage conversion at collector and emitter both ends passes through into data signal DSP is handled and is shown specific magnitude of voltage V by display0, can determine whether that electric energy meter communication module interface load capacity is according to this value It is no to meet to require；When what is monitored flows through triode Q1Current value idMore than triode Q1Maximum allowed current or TEMP When the temperature that device detects exceedes predetermined value, DSP sends control signal, passes through triode Q2Control relay J1Coil, make after Electrical equipment J1Disconnect, play overprotection.
4. communication module of intelligent electric energy meter interface load capacity method of testing as claimed in claim 3, it is characterized in that：Using closing The proportional plus integral control strategy of ring negative-feedback, realizes zero steady state error control；Control unit includes subtraction circuit and proportional integral circuit； Resistance R4, resistance R5, resistance R6, resistance R7With amplifier A2Differential type subtraction circuit is formed, realizes given value of current valueAnd reality Value idSubtract each other；Resistance R8, resistance R9, electric capacity C1With amplifier A1Composition integrating circuit, realization pairAnd idDifference floating Control.
5. communication module of intelligent electric energy meter interface load capacity method of testing as claimed in claim 4, it is characterized in that：Resistance R4、 Resistance R5, resistance R6, resistance R7With amplifier A2Form differential type subtraction circuit, amplifier A2Export V1With given value of current valueWith Actual value idThere is following relation：
<mrow> <msub> <mi>V</mi> <mn>1</mn> </msub> <mo>=</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>4</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>7</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>4</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <mfrac> <msub> <mi>R</mi> <mn>6</mn> </msub> <mrow> <msub> <mi>R</mi> <mn>5</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>6</mn> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <msub> <mi>i</mi> <mi>d</mi> </msub> <mo>-</mo> <mfrac> <msub> <mi>R</mi> <mn>7</mn> </msub> <msub> <mi>R</mi> <mn>4</mn> </msub> </mfrac> <mo>&amp;times;</mo> <msubsup> <mi>i</mi> <mi>d</mi> <mo>*</mo> </msubsup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
As resistor satisfied R4=R5=R6=R7When, above formula can be reduced to：
<mrow> <msub> <mi>V</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>i</mi> <mi>d</mi> </msub> <mo>-</mo> <msubsup> <mi>i</mi> <mi>d</mi> <mo>*</mo> </msubsup> <mo>=</mo> <mo>-</mo> <mrow> <mo>(</mo> <msubsup> <mi>i</mi> <mi>d</mi> <mo>*</mo> </msubsup> <mo>-</mo> <msub> <mi>i</mi> <mi>d</mi> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
6. communication module of intelligent electric energy meter interface load capacity method of testing as claimed in claim 4, it is characterized in that：Resistance R8、 Resistance R9, electric capacity C1With amplifier A1Composition integrating circuit, amplifier A1Export V2With input voltage V1Relation is as follows：
<mrow> <msub> <mi>V</mi> <mn>2</mn> </msub> <mo>=</mo> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>R</mi> <mn>9</mn> </msub> <msub> <mi>R</mi> <mn>8</mn> </msub> </mfrac> <msub> <mi>V</mi> <mn>1</mn> </msub> <mo>+</mo> <mfrac> <mn>1</mn> <mrow> <msub> <mi>R</mi> <mn>8</mn> </msub> <msub> <mi>C</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>&amp;Integral;</mo> <msub> <mi>V</mi> <mn>1</mn> </msub> <mi>d</mi> <mi>t</mi> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
7. communication module of intelligent electric energy meter interface load capacity method of testing as claimed in claim 3, it is characterized in that：Detect intelligence The step of energy electric energy meter communication interface load capacity, is as follows：
Step 1：Power-on, test start；
Step 2：According to tested electric energy meter type, setting electric current value initial value
Step 3：Detection resistance R3Voltage, obtain flowing through triode Q1Electric current；
Step 4：Temperature sensor detects power device temperature；
Step 5：Detection temperature exceedes preset temperature, system alarm, and test is interrupted；Detection temperature is less than preset value, into step 7；
Step 6：Detection electric current exceedes triode Q1Maximum allowed current, system alarm, test are interrupted；Detection electric current is less than three poles Pipe Q1Maximum allowed current, into step 7；
Step 7：DSP compares current setting valueWith current actual value id；
Step 8：Current setting valueWith current actual value idWhen unequal, into step 9；Current setting valueIt is actual with electric current Value idWhen equal, into step 11；
Step 9：Passing ratio integration control regulation triode Q1Voltage between base terminal and emitter stage,
Step 10：Return to step 3, until actual current idWith setting valueApproximately equal；
Step 11：Detect electric energy meter communication module interface VCCVoltage V between end and GND0；
Step 12：DSP judges V0Whether in the range of ± 12 ± 1V, test result is provided：As equal, then tested electric energy meter is judged Meet to require；If not in the range of, then judged, tested electric energy meter is unsatisfactory for requiring；
Step 13：Test terminates.
CN201710604020.3A 2017-07-21 2017-07-21 Communication module of intelligent electric energy meter interface load capacity test device and method Withdrawn CN107450043A (en)

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