CN101634695A - Method and device for calibrating power source - Google Patents

Method and device for calibrating power source Download PDF

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Publication number
CN101634695A
CN101634695A CN200910303212A CN200910303212A CN101634695A CN 101634695 A CN101634695 A CN 101634695A CN 200910303212 A CN200910303212 A CN 200910303212A CN 200910303212 A CN200910303212 A CN 200910303212A CN 101634695 A CN101634695 A CN 101634695A
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China
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power source
electrical
calibration
setting value
output
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CN200910303212A
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Chinese (zh)
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CN101634695B (en
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欧勇
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深圳市科陆电子科技股份有限公司
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Abstract

The invention relates to a method for calibrating a power source, which comprises the following steps: (A) acquiring electrical parameters outputted to a standard electric energy meter by the power source in a stable output state, and comparing the electrical parameters with the theoretical output parameters of the power source; (B) judging whether the settings of the power source need adjusting or not; if not, going back to step (A); if so, performing the next step; (C) adjusting the calibration parameters of the power source, storing the calibration parameters and going back to step (A). The invention also relates to a device for realizing the calibration method. The method and the device for calibrating a power source have the advantages of convenient use and low cost, and the errors can be controlled for a long time.

Description

A kind of calibration steps of power source and device

Technical field

The present invention relates to field of electrical equipment, more particularly, relate to a kind of calibration steps and device of power source.

Background technology

Usually, in electric system, use electric energy calibration stage body that electric energy meter is carried out adjustment, and electric energy calibration stage body comprise a power source that is used to provide the energy requirement output of adjustment electric energy meter institute.If the output of this power source is inaccurate, use the electric energy meter of this electric energy calibration stage body institute adjustment inaccurate naturally.So power source needs to guarantee higher output accuracy when work generally speaking.Simultaneously, because the power source on the calibration stage body has no idea to guarantee all output points, long-term work always therefore need be by regularly calibrating this problem that solves to power in a scope of stablizing, meeting the demands.In the prior art, the power source of every electric energy calibration stage body all needs the electrical quantity of normative reference electric energy meter test, and the amplitude and the phase place of each gear are carried out regular manual calibration, and the output of guaranteeing power source is in the scope that requires.Therefore, the calibration operation of every stage body all must drop into sizable man power and material and finish this work, and is not only inconvenient, cause cost to rise, and since manually-operated bigger error may occur and occur.

Summary of the invention

The technical problem to be solved in the present invention is, and is high and defective than mistake may occur at above-mentioned inconvenience, the cost of prior art, provides a kind of convenience, cost is low and the calibration steps of the controllable power source of error and device.

The technical solution adopted for the present invention to solve the technical problems is: construct a kind of calibration steps of power source, comprise the calibration parameter of obtaining described power source and control described power source beginning output, also comprise the steps:

A) obtain this power source and be in the electrical quantity of stablizing under the output state on the standard electric energy meter of outputing to, and with the theoretical output parameter of this power source relatively;

B) judge whether and need adjust,, return steps A as not to the setting of this power source), in this way, carry out next step;

C) calibration parameter of the described power source of adjustment is preserved this calibration parameter and is returned steps A).

In calibration steps of the present invention, described steps A) further comprise the steps:

A1) judge whether described power source is in stable output state, in this way, carry out next step,, repeat this step as not;

A2) take out the output electrical quantity theoretical value that decision is set by described power source, and compare with the described current actual value that obtains by standard electric energy meter.

In calibration steps of the present invention, described steps A 1) further comprise the steps:

A11) electrical quantity that successively reads on the described standard electric energy meter for twice according to the time interval of setting;

A12) obtain the poor of the above-mentioned electrical parameter values that reads for twice, less than first setting value, then be judged to described power source as the electrical quantity ratio on its absolute value and the standard electric energy meter for steady state (SS), otherwise, be judged to described power source and be not in steady state (SS), return steps A 11).

In calibration steps of the present invention, described step B) further comprise the steps:

B1) obtain the difference of described electrical quantity theoretical value and the described currency of obtaining by standard electric energy meter;

B2) ratio of described difference of judgement and described output electrical quantity theoretical value, with the size of second setting value, the ratio of the absolute value of difference and described output electrical quantity theoretical value then returns steps A less than described second setting value as described); Otherwise, carry out next step.

In calibration steps of the present invention, described step C) further comprise the steps:

C1) whether obtained difference greater than zero determining step B1), as greater than zero execution in step C2; Otherwise execution in step C3);

C2) described calibration parameter is increased by one the 3rd setting value;

C3) described calibration parameter is reduced one the 3rd setting value;

C4) with step C3) in the value that obtains preserve as current calibration parameter and be used to control described power source output.

In calibration steps of the present invention, described the 3rd setting value span comprises the 0.011%-5% of described calibration parameter; Described calibration parameter comprises the amplitude calibration parameter and the phase alignment parameter of described power source output waveform; Described first, second includes amplitude setting value and phase settings with the 3rd setting value.

The invention still further relates to a kind of device of realizing above-mentioned power source calibration steps, comprise power source and control the control module of described power source, it is characterized in that, also comprise standard electric energy meter, described standard electric energy meter is connected on the described power source output port by voltage tester line and testing current line and measures the electrical quantity of described power source output; Described control module comprises the controller that is used to control described power source and control module action, storer and the communication interface that is used to preserve data and program, described communication interface is connected with described standard electric energy meter, and described control module obtains the measured electrical quantity of described standard electric energy meter by its communication interface.

In device of the present invention, described control module comprises that further the electrical quantity that is used for obtaining by described communication interface the current electrical quantity of described standard electric energy meter obtains the unit, be used for obtaining the difference between the electrical quantity of obtaining for twice unit and the ratio of electrical quantity by described electrical quantity, judge the steady state (SS) judging unit of described power source output steady state (SS), judge whether the calibration parameter judging unit that need adjust above-mentioned calibration parameter by the difference between the theoretical output valve of described power source under the electrical quantity obtained under the described steady state (SS) and the Set For Current, be used for described calibration parameter is adjusted and replaced with adjusted calibration parameter the calibration parameter adjustment unit of current calibration parameter.

In device of the present invention, described control module comprises that also the adjustment step-length that is used to adjust described the 3rd setting value is provided with the unit, is used to the second setting value adjustment unit adjusting the first setting value adjustment unit of described first setting value and be used to set described second setting value; Described adjustment step-length setup unit comprises adjusting range step-length setup unit and adjusts the phase step setup unit; Described second, third setting value adjustment unit comprises amplitude setting value adjustment unit and phase settings adjustment unit respectively.

In device of the present invention, described communication interface comprises RS485, RS232 or Ethernet interface; Described control module comprises also being used to send and reads the instruction of described electrical quantity and receive described electrical quantity and the communication unit adaptive with described communication interface that the communication unit of telling is connected between described communication interface and the described controller.

Implement the calibration steps and the device of power source of the present invention, has following beneficial effect: owing to be on accessing the basis that the calibration parameter that is stored in the storer comes power controlling source output, to carry out when beginning to calibrate described power source, and control module is adjusted according to setting step-length automatically according to the electrical quantity of sending back to of the standard electric energy meter that is connected with power source automatically, therefore, this power source calibration steps and device are conveniently, cost is low and the error may command.

Description of drawings

Fig. 1 is the calibration steps of a kind of power source of the present invention and the method flow diagram among the device embodiment;

Fig. 2 is the structural representation that installs among the described embodiment;

Fig. 3 is the structural representation of control module in the described embodiment device.

Embodiment

Embodiments of the present invention is further illustrated below in conjunction with accompanying drawing.

As shown in Figure 1, in the calibration steps and device embodiment of a kind of power source of the present invention, this calibration steps comprises the steps:

Step S11 begins calibration: this step is the beginning of this power source of calibration, may be when the electric energy correction platform at this power source place be started working, also can be after work a period of time at this electric energy correction platform, but, no matter be to begin to calibrate above-mentioned power source when, begin to be connected with standard electric energy meter on this power source in this step, do not connect other loads, and the communication port of this standard electric energy meter by power source is connected with the control module of this power source.In the present embodiment, this step is taked when this electric energy correction platform is started working.

Step S12 loads calibration parameter: owing to its calibration parameter that adopts is kept in the storer of control module when once working on this power source, therefore, in this step, at first be to access this calibration parameter, make its output take and to compensate to power source, make the parameter of power source output try one's best, make that just the output of power source is accurate as far as possible near theoretical value.Certainly, for various reasons, after this power source adopted calibration parameter, also not necessarily just accurately, still may exist must deviation for its output valve.In fact, the problem that present embodiment will solve makes just and the inaccurate controlled of above-mentioned this power source output makes it not need artificial the intervention just to be controlled within the acceptable range automatically.

Step S13 control module reads electrical quantity by communication interface: being begun by this step, to step S16, is to judge whether power source is in a stable output state.Usually, electronic product all has the problem of a thermal stability, and when equipment was just started working, because its product or system do not reach thermal equilibrium, so its duty was normally unsettled, and in other words, the variation of its output may be bigger; And after it reached thermal equilibrium, though its output valve also has fluctuation, its fluctuating range was less, and the difference size between the electrical parameter values that can be read by two different times is judged electronic product and is in above-mentioned which state.Control module begins to output to electrical quantity on the standard electric energy meter by communication interface readout power source in this step, after this electrical quantity is read, need be kept in the control module, normally be stored in the appointed area of the work register of above-mentioned control module or its storer; In the present embodiment, this electrical energy parameter comprises amplitude and two parameters of phase place of this power source output waveform; The electrical quantity that also can comprise in other embodiments, other.

Step S14 reads electrical quantity once more through control module behind the Preset Time: this step be control module read and the store electricity parameter after, the default at interval time, the readout power source outputs to the electrical quantity on the standard electric energy meter once more.Similarly, this parameter also is stored in the appointed area of the work register of above-mentioned control module or its storer, but with the electrical parameter values separate storage that read last time, with the use after convenient.

Step S15 obtains the ratio that is worth on the difference of above-mentioned twice electrical quantity and the standard electric energy meter: in this step, the electrical quantity that above-mentioned steps S13, step S14 obtain is compared, obtain difference therebetween, and the value of reading on this difference and the above-mentioned standard electric energy meter is compared (promptly obtaining the number percent of this difference at the standard electric energy meter reading).In the present embodiment, will preserve exactly, read the obtained electrical parameter values of electrical quantity for twice, range value that it comprises respectively and phase value are wanted respectively to subtract, and obtain respectively that it is poor.

Does step S16 judge that above-mentioned ratio is greater than first preset value? whether the ratio among the determining step S16 is greater than first preset value, in this way, illustrate that the gap between the electrical quantity that reads for twice is bigger, power source does not enter steady state (SS) as yet, need return step S13 and read electrical parameter values again; As not, illustrate that the gap between the electrical quantity that reads for twice is less, power source has entered steady state (SS), can carry out next step action.In the present embodiment, because electrical quantity comprises range parameter and phase parameter, therefore in fact need to judge respectively, and the size of first preset value is adjustable, this first preset value is set and is regulated this first preset value by control module; In the present embodiment, first preset value comprises first preset value of range parameter and first preset value of phase parameter, and first preset value of range parameter is identical with first preset value of phase place, in other embodiments, first preset value of above-mentioned range parameter and first preset value of phase place also can be inequality, and are regulated by special mechanism respectively.

Step S17 obtain current electrical quantity theoretical value with after the difference of the electrical parameter values that reads and the ratio of electrical quantity theoretical value: when above-mentioned difference during less than first preset value, be exactly that power source has entered the output stable status, just it has reached thermal equilibrium, can begin to calibrate power source.Because power source has different theoretic output valve (or claiming nominal value) when different the setting, in this step, exactly with the numerical value of above-mentioned current electrical quantity (promptly the electrical parameter values that in step S14, obtains or be called after the electrical parameter values that obtains) with above-mentioned nominal value relatively, and obtain its difference, compare with the above-mentioned theory value with this difference again, promptly obtain this difference shared number percent in the above-mentioned theory value.In the present embodiment, because electrical quantity comprises range parameter and phase parameter, therefore, in this step, what obtain is amplitude difference and phase difference value equally.Because in fact electrical quantity comprises range parameter and phase parameter in the present embodiment, therefore later description in fact all comprises range parameter and phase parameter, for for simplicity, repeats no more afterwards.

Does step S18 judge that above-mentioned ratio is greater than second preset value? in this step, is the absolute value of the ratio that obtains among the determining step S18 greater than second preset value? as greater than, the calibration parameter that explanation is loaded in step S12 for a certain reason, not too suitable, can not make the output of power source be positioned at the acceptable error range, need adjust it, therefore, execution in step S19; As less than, think that then the output error of power source still in the acceptable error range, does not need this calibration parameter is adjusted, therefore, return step S13.Above-mentioned second setting value is except that the implication of its representative and numerical value and above-mentioned first setting value are different, and its set-up mode and kind are identical with first setting value.

Step S19 judge above-mentioned after the electrical parameter values that reads greater than theoretical value? this step be judge above-mentioned after the electrical parameter values that obtains bigger than above-mentioned nominal value? owing to judged that in step S18 the difference of above-mentioned two-value has exceeded the scope that can accept, need adjust above-mentioned calibration parameter, but also ignorant is it to be adjusted greatly or its adjustment is little, therefore, in this step, need to judge the direction of above-mentioned adjustment, if the more above-mentioned nominal value of this electrical quantity is big, with execution in step S20; If the more above-mentioned nominal value of this electrical quantity is little, with execution in step S21.

Step S20 reduces current calibration parameter by the 3rd setting value: in this step, current calibration parameter value (i.e. the calibration parameter value of loading in step S12) is reduced, the value of its minimizing is the 3rd setting value, the calibration parameter value that is about to obtain among the step S12 is as the basis, on this basis, reduce its numerical value, the numerical value that reduces is the 3rd setting value, thereby obtains new calibration parameter value.Above-mentioned the 3rd preset value is to be provided with in advance, and it can be regulated by control module equally, and except that the implication of its representative and numerical value and above-mentioned first setting value were different, its set-up mode and kind were identical with first setting value.In the present embodiment, the 3rd preset value is set to 2% of above-mentioned current calibration parameter value.

Step S21 increases current calibration parameter by the 3rd setting value: in this step, current calibration parameter value (i.e. the calibration parameter value of loading in step S12) is increased, the value of its increase is the 3rd setting value, the calibration parameter value that is about to obtain among the step S12 is as the basis, on this basis, increase its numerical value, the numerical value that increases is the 3rd setting value, thereby obtains new calibration parameter value.Above-mentioned the 3rd preset value is to be provided with in advance, and it can be regulated by control module equally, and except that the implication of its representative and numerical value and above-mentioned first setting value were different, its set-up mode and kind were identical with first setting value.In the present embodiment, the 3rd preset value is set to 2% of above-mentioned current calibration parameter value.

Step S22 stores resulting calibration parameter: in this step, and storage above-mentioned steps S20 or the resulting new calibration parameter of step S21, and after this parameter of storage, return step S12.

By the enforcement of above steps, form an automatically process of calibration power source, make that its calibration process is convenient, cost is low and its departure within the acceptable range, simultaneously, this error may command.

Also comprise a device of realizing said method in the present embodiment, Fig. 2 is a structural representation of realizing the device of said method.As described in Figure 2, this device comprises power source 1, control module 2, standard electric energy meter 3, voltage measurement line 4 and current measurement line 5.Wherein, above-mentioned power source 1 is connected with control module 2 by control line, control module 2 is connected with standard electric energy meter 3 by communication interface, and simultaneously, standard electric energy meter also is connected with current output terminal with the voltage output end of above-mentioned power source respectively with current measurement line 5 by voltage measurement line 4.Again among Fig. 2, control module 2 power controlling sources, 1 output current and voltage, and be added to the voltage output end and the current output terminal of standard electric energy meter 3; After standard electric energy meter is received this output, obtain its electrical quantity, and will send to control module, and come the output in power controlling source, thereby reach the purpose of automatic detection by control module 2 by communication interface.

Fig. 3 is the structural representation of control structure among Fig. 2, in Fig. 3, electrical quantity is obtained the unit and is comprised that electrical quantity obtains unit 21, steady state (SS) judging unit 22, calibration parameter judging unit 23, calibration parameter adjustment unit 24, adjusts the second setting value adjustment unit 27 that step-length is provided with unit 25, the first setting value adjustment unit 26 and is used to set described second setting value; Wherein, electrical quantity is obtained unit 21 and is used for by described communication interface and obtains the current electrical quantity of described standard electric energy meter; Steady state (SS) judging unit 22 is used for obtaining by described electrical quantity the ratio size of electrical parameter values obtained on difference between the electrical quantity of obtaining for twice unit 21 and the standard electric energy meter and judges described power source output steady state (SS); Calibration parameter judging unit 23 by the ratio of difference between the theoretical output valve of power source under electrical quantity of obtaining under its steady state (SS) and the Set For Current and described theoretical output valve judge whether to adjust to above-mentioned calibration parameter, calibration parameter adjustment unit 24 is used for described calibration parameter is adjusted and replaced current calibration parameter with adjusted calibration parameter.In addition, the adjustment step-length is provided with unit 25 and is used to adjust described the 3rd setting value, and the first setting value adjustment unit 26 is used to adjust described first setting value, and the second setting value adjustment unit 27 is used to set described second setting value; Wherein, adjusting step-length setup unit 25 comprises adjusting range step-length setup unit and adjusts phase step setup unit (not shown); The second setting value adjustment unit 26, the 3rd setting value adjustment unit 27 comprise amplitude setting value adjustment unit and phase settings adjustment unit (not shown) separately respectively.

In addition, in the present embodiment, the communication port that above-mentioned control module 2 comprises is the RS232 interface, between these RS232 Interface and Controler 1, be provided with the communication module (not shown), this communication module is used for finishing information translation between controller 1 and communication port.In other embodiments, above-mentioned communication interface can also comprise the communication interface of extended formatting, for example, and RS485 or Ethernet interface, the same suitable communication unit of communication interface that is provided with and adopts between controller 1 and communication interface for example is suitable for RS485 or Ethernet interface.

The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1. the calibration steps of a power source comprises the calibration parameter of obtaining described power source and controls described power source beginning output, it is characterized in that, also comprises the steps:
A) obtain this power source and be in the electrical quantity of stablizing under the output state on the standard electric energy meter of outputing to, and with the theoretical output parameter of this power source relatively;
B) judge whether and need adjust,, return steps A as not to the setting of this power source), in this way, carry out next step;
C) calibration parameter of the described power source of adjustment is preserved this calibration parameter and is returned steps A).
2. calibration steps according to claim 1 is characterized in that, described steps A) further comprise the steps:
A1) judge whether described power source is in stable output state, in this way, carry out next step,, repeat this step as not;
A2) take out the output electrical quantity theoretical value that decision is set by described power source, and compare with the described current actual value that obtains by standard electric energy meter.
3. calibration steps according to claim 2 is characterized in that, described steps A 1) further comprise the steps:
A11) electrical quantity that successively reads on the described standard electric energy meter for twice according to the time interval of setting;
A12) obtain the poor of the above-mentioned electrical parameter values that reads for twice, less than first setting value, then be judged to described power source as the electrical quantity ratio on its absolute value and the standard electric energy meter for steady state (SS), otherwise, be judged to described power source and be not in steady state (SS), return steps A 11).
4. calibration steps according to claim 3 is characterized in that, described step B) further comprise the steps:
B1) obtain the difference of described electrical quantity theoretical value and the described currency of obtaining by standard electric energy meter;
B2) ratio of described difference of judgement and described output electrical quantity theoretical value, with the size of second setting value, the ratio of the absolute value of difference and described output electrical quantity theoretical value then returns steps A less than described second setting value as described); Otherwise, carry out next step.
5. calibration steps according to claim 4 is characterized in that, described step C) further comprise the steps:
C1) whether obtained difference greater than zero determining step B1), as greater than zero execution in step C2; Otherwise execution in step C3);
C2) described calibration parameter is increased by one the 3rd setting value;
C3) described calibration parameter is reduced one the 3rd setting value;
C4) with step C2) or C3) in the value that obtains preserve as current calibration parameter and be used to control described power source output.
6. calibration steps according to claim 5 is characterized in that, described the 3rd setting value span comprises the 0.011%-5% of described calibration parameter; Described calibration parameter comprises the amplitude calibration parameter and the phase alignment parameter of described power source output waveform; Described first, second includes amplitude setting value and phase settings with the 3rd setting value.
7. device of realizing the described power source calibration steps of claim 1, comprise power source and control the control module of described power source, it is characterized in that, also comprise standard electric energy meter, described standard electric energy meter is connected on the described power source output port by voltage tester line and testing current line and measures the electrical quantity of described power source output; Described control module comprises the controller that is used to control described power source and control module action, storer and the communication interface that is used to preserve data and program, described communication interface is connected with described standard electric energy meter, and described control module obtains the measured electrical quantity of described standard electric energy meter by its communication interface.
8. device according to claim 7, it is characterized in that described control module comprises that further the electrical quantity that is used for obtaining by described communication interface the current electrical quantity of described standard electric energy meter obtains the unit, be used for obtaining the difference between the electrical quantity of obtaining for twice unit and the ratio of electrical quantity by described electrical quantity, judge the steady state (SS) judging unit of described power source output steady state (SS), judge whether the calibration parameter judging unit that need adjust above-mentioned calibration parameter by the difference between the theoretical output valve of described power source under the electrical quantity obtained under the described steady state (SS) and the Set For Current, be used for described calibration parameter is adjusted and replaced with adjusted calibration parameter the calibration parameter adjustment unit of current calibration parameter.
9. device according to claim 8, it is characterized in that described control module comprises that also the adjustment step-length that is used to adjust described the 3rd setting value is provided with the unit, is used to the second setting value adjustment unit adjusting the first setting value adjustment unit of described first setting value and be used to set described second setting value; Described adjustment step-length setup unit comprises adjusting range step-length setup unit and adjusts the phase step setup unit; Described second, third setting value adjustment unit comprises amplitude setting value adjustment unit and phase settings adjustment unit respectively.
10. according to any described device of claim 7-9, it is characterized in that described communication interface comprises RS485, RS232 or Ethernet interface; Described control module comprises also being used to send and reads the instruction of described electrical quantity and receive described electrical quantity and the communication unit adaptive with described communication interface that the communication unit of telling is connected between described communication interface and the described controller.
CN2009103032126A 2009-06-12 2009-06-12 Method and device for calibrating power source CN101634695B (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN102338865A (en) * 2011-06-17 2012-02-01 杭州炬华科技股份有限公司 Method for quickly calibrating error of three-phase intelligent electric energy meter
CN102929318A (en) * 2011-08-09 2013-02-13 上海松下微波炉有限公司 Cooking voltage calibration method for microwave oven
CN103293509A (en) * 2012-02-29 2013-09-11 陕西省地方电力(集团)有限公司 Calibrating method of electric energy meter system parameters
CN105203986A (en) * 2015-09-16 2015-12-30 国家电网公司 Digital power source tracing method and system
CN106371035A (en) * 2016-08-31 2017-02-01 郑州众智科技股份有限公司 Three-phase precision test power supply error measurement system and method
CN106814342A (en) * 2017-01-12 2017-06-09 华立科技股份有限公司 Electric energy meter quick calibration method
CN107422292A (en) * 2017-04-10 2017-12-01 华立科技股份有限公司 Correction method for intelligent electric meter

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US4999572A (en) * 1988-09-19 1991-03-12 General Electric Company Redundant pulse monitoring in electric energy metering system
CN2147549Y (en) * 1993-02-06 1993-11-24 保定电力学校电力设备仪器厂 Intelligent electric power meter correcting gauge
CN101153900B (en) * 2006-09-30 2011-05-04 深圳市科陆电子科技股份有限公司 Calibration method and system for electric energy meter

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Publication number Priority date Publication date Assignee Title
CN102338865A (en) * 2011-06-17 2012-02-01 杭州炬华科技股份有限公司 Method for quickly calibrating error of three-phase intelligent electric energy meter
CN102338865B (en) * 2011-06-17 2013-11-06 杭州炬华科技股份有限公司 Method for quickly calibrating error of three-phase intelligent electric energy meter
CN102929318A (en) * 2011-08-09 2013-02-13 上海松下微波炉有限公司 Cooking voltage calibration method for microwave oven
CN102929318B (en) * 2011-08-09 2015-12-09 上海松下微波炉有限公司 The cooking voltage calibration method of micro-wave oven
CN103293509A (en) * 2012-02-29 2013-09-11 陕西省地方电力(集团)有限公司 Calibrating method of electric energy meter system parameters
CN105203986A (en) * 2015-09-16 2015-12-30 国家电网公司 Digital power source tracing method and system
CN106371035A (en) * 2016-08-31 2017-02-01 郑州众智科技股份有限公司 Three-phase precision test power supply error measurement system and method
CN106814342A (en) * 2017-01-12 2017-06-09 华立科技股份有限公司 Electric energy meter quick calibration method
CN107422292A (en) * 2017-04-10 2017-12-01 华立科技股份有限公司 Correction method for intelligent electric meter

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