CN109738846B - Meter calibration method based on meter active self-calibration - Google Patents

Meter calibration method based on meter active self-calibration Download PDF

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Publication number
CN109738846B
CN109738846B CN201910071197.0A CN201910071197A CN109738846B CN 109738846 B CN109738846 B CN 109738846B CN 201910071197 A CN201910071197 A CN 201910071197A CN 109738846 B CN109738846 B CN 109738846B
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meter
checking
checked
calibration
management
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CN109738846A (en
Inventor
周良璋
谢忧悒
王韶璞
李朝贵
王柯童
周蕾蕾
李艳新
金佳峰
李扬
程锐
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Ningbo Henglida Technology Co ltd
HANGZHOU HEXING ELECTRICAL CO Ltd
Nanjing Haixing Power Grid Technology Co Ltd
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Ningbo Henglida Technology Co ltd
HANGZHOU HEXING ELECTRICAL CO Ltd
Nanjing Haixing Power Grid Technology Co Ltd
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Abstract

The invention discloses a meter calibration method based on meter active self-calibration, which adopts a mode of a meter to be calibrated and a calibration device, wherein the meter to be calibrated actively calibrates the meter according to a meter calibration scheme and parameters stored in the meter to be calibrated, independently judges whether the calibration is qualified or not by combining error data and upper and lower limits of errors built in the meter to be calibrated, and uploads the calibration data and a judgment result to a management system. The original passive meter calibration is changed into the active control automatic meter calibration of the calibration device, so that the development and maintenance of meter calibration upper computer software with different protocols are reduced, and meanwhile, the calibration equipment is changed from active to passive, so that the calibration equipment is simplified.

Description

Meter calibration method based on meter active self-calibration
Technical Field
The invention relates to a high-speed meter calibrating method based on meter active self-calibration, which is mainly used for calibrating an intelligent electric energy meter.
Background
With the overall planning of the national network on the next generation smart grid, the large administrative policy of the portable source internet and the requirement of the national network on fine management, the technical complexity of the meter becomes higher and higher, and many small meter enterprises are difficult to bear the continuous high-intensity research and development investment and gradually adopt an OEM mode. After OEMs may gradually become a mainstream business, in order to win orders of OEMs, the automation degree and the production efficiency must be improved, because only the automation degree and the production efficiency are high, the cost is competitive, on the other hand, the manpower cost of china continuously rises, the internal manufacturing cost continuously increases, and the external market competition is more and more intense, so that the reduction and the increase of the number of the members are particularly important, and the requirement of enterprises for improving the production efficiency is more urgent.
The traditional meter calibration mode is that the meter is a passively calibrated product, the calibration stage body and the automatic meter calibration assembly line are active calibration devices, the stage body and the automatic assembly line initiate and control the whole meter calibration process and judgment of a result, and the following two problems exist: 1. the efficiency is low. The table body or the automatic assembly line is active, so that the table body can initiate meter calibration work only after all the meter positions are detected to be in place, the meters of all the meter positions need to be hung in the common table body during meter calibration, the meters of all the meter positions need to be put in bins during meter calibration of the automatic assembly line, waiting time is very long, most time is wasted, and the integral meter calibration efficiency is very low.
2. The equipment or the assembly line is too complex, so that the instability is caused, and the capacity loss is caused. The device is required to output stable voltage, current and phase of a calibration meter, and is also required to have control capability for controlling different calibration gear positions and communication capability of meters with different communication protocols, error calculation capability of the meters with each meter position is required, output capability of isolated current is required for a two-wire single-phase meter, and isolation capability of voltage is required for a calibration table body of a three-phase meter, so that the whole table body or a production line becomes very complex, and in order to meet the requirements, the device is divided into a signal source, a standard meter, a voltage power amplifier, a current power amplifier, an isolated CT (computed tomography), an error calculator, an isolated PT (potential transformer) and other parts and is assembled, and meter calibration software of different meters is required to be installed on a computer; therefore, the whole meter and the table body are very complicated, and once the equipment and the software are complicated, the reliability is reduced, so that the problems of the meter calibration table body and the meter calibration assembly line frequently occur in a workshop, the whole production line is stopped for maintenance, and the production is seriously influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-speed meter calibrating method based on meter active self-calibration.
The invention adopts the following technical scheme:
a meter calibration method based on meter active self-calibration, the method comprises the following steps:
s1, setting parameters of the checking device corresponding to each epitope according to the information of the checked table;
s2, hanging the corresponding epitope on the detected meter, and loading rated voltage for the detected meter by the checking device to supply power for the detected meter;
s3, the checking device actively uploads the power-on instruction of the address and the checked table to the management system, the management system receives the instruction and then gives a response to the checking device, the template number of the checked table is obtained after a plurality of seconds of delay (the template number is the factory internal number, is unique and not repeated, and is similar to the identity card number and used for representing the identity of the identity card), and the procedure judgment is carried out according to the template number; if the process is judged to pass, sending a table calibration enabling command to the checked table, and executing the step S4; if the process does not pass the judgment, the management system controls the calibration device to power off the checked meter (the power off is that the management system controls the calibration device to reduce the source (the voltage and current output is 0), the calibration device does not supply power to the checked meter) and sends a fault alarm signal, and the calibration is stopped;
s4, the checked meter sends a parameter packet (the parameter packet contains the meter type, the basic voltage, the current, the output frequency, the output phase sequence, the current direction, the power factor and the like) to the checking device, requests the checking device to load voltage and current signals, automatically judges whether the checking is qualified or not according to the checking meter scheme and the parameter active checking meter stored in the checking device under the condition that the checking device outputs stability by combining the test data and the upper and lower limits of the error built in the checked meter, and uploads the checking data and the judgment result to the management system;
and each meter position is correspondingly provided with one checking device, and the checking devices are mutually independent and are respectively in communication connection with the management system.
The management system is installed in the PC end, comprises the whole production process of the electric meters, and records which processes each electric meter undergoes in real time, so as to judge whether the current process conforms to the production process.
Further, in step S1, the setting of parameters for the checking device corresponding to each epitope according to the order information of the checked table is specifically:
according to the order information of the checked meter, manually inquiring to obtain the specification information of the checked meter, and then carrying out output voltage specification setting on the calibration device corresponding to each meter position through a management system. For the checked tables of the same order, step S1 is performed only when the tables are first corrected, and the following steps may be omitted.
Further, S2 may be powered up in manual mode or automatic mode hang-up. The manual mode specifically is:
the method comprises the following steps that a corresponding meter position is hung on a detected meter, a meter hanging state signal is triggered and fed back to a checking device, the checking device starts a voltage output switch of the checking device after receiving the signal and controls a meter position state indicator lamp to display a green lamp, and the checking device outputs a rated voltage value to the detected meter to supply power to the detected meter;
or, the automatic mode hanging watch is powered on: the corresponding meter position is hung on the checked meter, the meter hanging state signal is triggered and fed back to the checking device, the checking device automatically outputs the rated voltage value to the checked meter after delaying for a plurality of seconds, the power is supplied to the checked meter, and the meter position state indicator lamp is controlled to display a green light.
Further, in step S3, delaying for several seconds to obtain the template number of the table to be checked, specifically:
the management system sends a response message to the checking device, and after delaying for a plurality of seconds, the management system actively sends an instruction for acquiring the template number of the table to be checked to the table to be checked;
after receiving the instruction, the detected table sends the template number to the management system through the checking device;
the management system binds the detected table with the checking device according to the template number of the detected table and the address of the checking device (the binding is for the follow-up data tracing and statistics, and the unqualified table extracted by the subsequent spot check can be checked back to which checking device is checked out for timely processing and maintenance), and stores the binding information.
Further, in step S4, after receiving the calibration enabling command, the table to be checked sends a parameter packet to the calibration apparatus, and requests the calibration apparatus to load voltage and current signals, which specifically includes:
after receiving the meter calibration enabling command, the meter to be tested actively sends the command to the calibration device for adjustment according to the scheme and the parameters stored in the meter to be tested, and the calibration device automatically adjusts and outputs the command and outputs voltage and current signals to the meter to be tested.
Further, in step S4, the method for determining that the output of the verifying device is stable includes:
after receiving the voltage and current signals loaded by the verifying device, the checked meter inquires whether the output of the verifying device is stable, and the verifying device feeds a stable result back to the checked meter according to the inquiry;
if the checked table receives the 'adjustment' instruction, the checked table resends the inquiry and waits for the check device to reply;
if the checked meter receives a success command, the meter is automatically calibrated;
if the checked meter receives the 'failure' instruction, the result is sent to the management system, the management system feeds back the checked meter and controls the power-down of the checking device, an unqualified signal is output, and the meter calibration is stopped.
Whether the power value is stable or not is judged by the CPU in the checking device, namely whether the output voltage, the output current and the output power are accurate or not by the CPU, and whether the output power value is stable or not is judged by the CPU, whether the output power value is accurate or not is judged by comparing the source output value with a theoretical value, whether the error range is controlled within +/-0.2%, whether the output power value is stable or not is judged by reading the difference value between the power value and the average value of the internal standard table within a certain time according to continuous seconds of the checking device, and whether the error range is controlled within +/-0.05%, namely, the checking device is stable.
In the existing mode, a software control source of an upper computer at a computer end outputs and reads a voltage value U2, a current value I2 and a power value W2 of a meter calibrating device, and sends the values to a measured table, the measured table calculates according to a voltage current power value sampled by the measured table and the values of U2, I2 and W2, calculates a difference value and a correction coefficient, and writes the difference value and the correction coefficient into a storage chip.
In step S4, the to-be-detected meter actively controls the calibration device to output voltage and current according to the test points in the calibration scheme, after the calibration device is stabilized, the to-be-detected meter reads the voltage value U1, the current value I1 and the power value W1 output by the calibration device, and the to-be-detected meter calculates the difference and the correction coefficient according to the voltage value, the current value and the power value which are sampled by the to-be-detected meter and the values of U1, I1 and W1, and writes the difference and the correction coefficient into the memory chip to complete the calibration.
Preferably, the method for calibrating the meter further comprises the following steps:
and S5, the management system feeds back the judgment result to the table to be checked, if the link of the table checking is qualified, the table to be checked executes the step S4 to automatically check the table in the next link, and if the link of the table checking is unqualified, the management system controls the calibration device to be powered down and outputs an unqualified signal, and the table checking is stopped.
Still preferably, the method for calibrating a meter further comprises the following steps:
and S6, if all the meter calibrating links of the meter to be calibrated are qualified, the management system feeds back the received result to the meter to be calibrated after receiving the judgment result and the qualified total conclusion of the last meter calibrating link, controls the calibration device to be powered down, outputs a qualified signal, and manually unloads the meter to finish meter calibration.
It should be noted that in the process of calibrating the table (S4-S6), the power of the table to be checked cannot be lost, and if the power is lost midway, manual intervention is needed to recalibrate the table.
In addition, the invention provides a meter calibrating device, which comprises epitopes for placing a checked meter, wherein each epitope is correspondingly provided with one calibrating device, and each calibrating device is respectively in communication connection with the checked meter on the corresponding epitope; the check devices are independent from each other and are respectively in communication connection with the management system.
Further, the calibration device is a portable calibration device (portable source, source for short), and is internally provided with a communication conversion module for mutual communication among the calibration device, the to-be-detected meter and the management system, and a power source for outputting voltage and current to the to-be-detected meter.
Compared with the prior art, the invention has the following beneficial effects:
1. the innovation of the calibration mode is that the to-be-tested meter actively controls the calibration device to calibrate the meter automatically, the development and maintenance of meter calibration upper computer software with different protocols are reduced, meanwhile, the calibration equipment is changed from active to passive, and the calibration equipment is simplified.
2. The meter calibration efficiency is high, one meter is used for one source, and all meter positions can be calibrated in parallel without mutual influence.
3. The equipment is modularized, a one-meter one-source mode is adopted, wiring is simple, and maintenance is convenient.
4. The meter automatically controls the source to automatically correct the meter according to a built-in scheme, and the meter correcting result meter automatically judges and uploads the upper limit and the lower limit of a built-in error to a management system for real-time monitoring.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the meter calibration method based on meter active self-calibration according to the present invention is performed in the meter calibration apparatus shown in FIG. 1. The meter checking device comprises a plurality of meter positions for placing the checked meter, each meter position is correspondingly provided with a checking device (portable source and source for short), and each checking device is respectively in communication connection with the checked meter on the corresponding meter position; the check devices are independent from each other and are in communication connection with a management system of the PC terminal respectively. The meter position is provided with a meter position used for hanging the meter and a meter position indicator lamp for displaying the state of the hanging meter, the checking device further comprises a power source and a communication conversion module, the power source is mainly used for outputting voltage and current to the tested meter and providing voltage and current for the tested meter, and the communication conversion module is used for realizing communication scheduling and protocol conversion among the tested meter, the power source and the management system installed at the PC end. Specifically, a HUB (HUB)/switch is arranged between the checking device and the PC end, and network communication is realized through a Socket interface of a TCP/IP protocol. The management system is specifically an MES system installed at a PC end, comprises the whole production flow of the electric meters, and records which flows each electric meter experiences in real time, so as to judge whether the current process accords with the production flow.
As shown in fig. 2, the meter calibrating method based on meter active self-calibration by using the meter calibrating device comprises the following steps:
s1: an operator acquires the parameter specification of a table to be checked through a management system of a PC (personal computer) end according to the order information of the table to be checked, parameter setting is carried out on calibration devices (each calibration device has different ID (identification) addresses and is set in advance in the management system) which correspond to each table to be checked one by one and are in communication connection with the management system end through the management system, and specific parameters are set to be output voltage specification setting; when the same order is aimed at, the step is only carried out when the table is calibrated for the first time, and the follow-up can be omitted.
S2: and powering up a manual mode or automatic mode hanging watch. The manual mode specifically is: the method comprises the following steps that a corresponding meter position is hung on a detected meter, a meter position triggering and meter hanging state signal is fed back to a checking device, the checking device controls a meter position state indicator lamp to display a green lamp (the green lamp is on to represent normal operation of equipment) after receiving the signal, a voltage output switch of the checking device is started manually, and the checking device outputs a voltage value to the detected meter to supply power to the detected meter;
the automatic mode specifically comprises: the corresponding meter position is hung on the detected meter, the meter position triggers a meter hanging state signal and feeds the signal back to the checking device, the checking device automatically outputs a voltage value to the detected meter after delaying for a plurality of seconds and controls a meter position state indicator lamp to display a green light; and if the checking device does not receive the meter hanging signal, no action is performed and the power is not supplied.
S3: after the detected table is electrified, the verifying device actively sends the instruction with the ID address and the electrified detected table to a management system of a PC (personal computer) end, the management system receives the instruction and then responds, and actively sends an instruction for acquiring the template number of the detected table to the detected table after delaying for several seconds, and after the detected table receives the instruction, the template number of the detected table is sent to the management system through a communication conversion module of the verifying device; the management system binds the table to be checked and the checking device according to the template number of the table to be checked and the address of the checking device, and stores the binding information, wherein the binding is for tracing and counting the subsequent data, and the unqualified table extracted by the subsequent spot check can be checked back to check which checking device is checked out, so that the table can be processed and maintained in time.
The management system carries out procedure judgment according to the template number, if the task of the table to be corrected exists, the procedure judgment is passed, the management system sends a table correction enabling command to the checked table, and then the next step S4 is carried out; if the task of the meter to be calibrated does not exist, the process judgment is failed, the management system sends a source descending request to the calibration device and controls to output a fault alarm signal (controls a meter calibration station indicator lamp of the calibration device to be red and light), the calibration device is powered down, the meter calibration is stopped, and manual intervention is carried out.
S4: after receiving the meter enable command, the meter under test actively sends a command to the checking device to be adjusted according to the internally stored scheme and parameters (the parameters include meter type, basic voltage, current, output frequency, output phase sequence, current direction, power factor, etc.), the checking device automatically adjusts the output according to the command, outputs voltage and current signals to the meter under test, actively checks the meter according to the internally stored meter scheme and parameters under the condition that the output of the checking device is stable, reads the instantaneous voltage value U1, the current value I1 and the power value W1 output by the checking device, calculates the error and the correction coefficient according to the voltage value, the current value and the power value which are sampled by the meter under test and U1, I1 and W1, writes the error and the correction coefficient into the chip, and stores the check data and the result (including the data of the test point and the data of the meter under test point and the self-judged whether the meter is qualified or not according to the built-in error upper and lower limits, error data refers to the absolute value of the difference between the instantaneous value of the checking device and the instantaneous value of the table to be checked) and is uploaded to the management system.
The method for judging the output stability of the checking device comprises the following steps: after receiving the voltage and current signals loaded by the checking device, the checked table sends an instruction for inquiring whether the checking device is stable to the checking device, after the checking device receives the instruction, an internal CPU (central processing unit) firstly judges the output accuracy, compares a source output value with a theoretical value, controls an error range to be +/-0.2%, then judges the power stability, reads a difference value between a power value and an average value of an internal standard table according to continuous seconds within a certain time of the checking device, judges that the checking device is stable after the error range is +/-0.05%, and feeds a stable result back to the checked table (the stable result has three states of being adjusted, successful and failed, and 20s of upper limit time of stability), and after receiving the instruction of being adjusted, the checked table resends the inquiry instruction and waits for the checking device to reply; if the checked meter receives a success command, the meter is automatically calibrated; if the checked meter receives the 'failure' instruction, the state of the meter position checking device is determined to be abnormal by default, the state is unqualified and sent to the management system, the management system responds to the checked meter and actively controls the checking device to be powered off, the checking device is controlled to output a fault alarm signal (the red light of the station indicator lamp of the meter checking device is on), the meter checking is stopped, and manual intervention is carried out.
S5: the management system feeds back the judgment result to the checked meter, if the link of the meter checking is qualified, the checked meter executes the step S4 to automatically check the meter of the next link, if the link of the meter checking is unqualified, the management system controls the calibration device to be powered down and outputs an unqualified signal, controls the calibration device to output an unqualified signal (the station of the meter checking is red, and the meter checking is stopped and is manually intervened).
S6: and if all the meter calibrating links of the checked meter are qualified, the management system feeds back the received result to the checked meter after receiving the judgment result and the qualified total conclusion of the last meter calibrating link, controls the calibration device to be powered down, outputs a qualified signal (a green lamp of a meter calibrating station is on), manually unloads the meter (a yellow lamp of a meter calibrating station indicator lamp is on after the meter is unloaded), and finishes meter calibration.
In the whole meter calibration process, the voltage of the detected meter cannot be powered down, otherwise, manual intervention is needed to calibrate the meter again. The calibration table of each link needs to inquire whether the calibration device is stable or not.
When the meter calibration is stopped in the meter calibration process and manual intervention is needed, an operator can read the stopping reason from the management system.
The above is only a preferred embodiment of the present invention, and the scope of the present invention is defined by the appended claims, and several modifications and amendments made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as the scope of the present invention.

Claims (10)

1. A meter calibration method based on meter active self-calibration is characterized by comprising the following steps:
s1, setting parameters of the checking device corresponding to each epitope according to the information of the checked table;
s2, hanging the corresponding epitope on the detected meter, and loading rated voltage for the detected meter by the checking device to supply power for the detected meter;
s3, the checking device actively uploads the address and the electrified command of the checked table to the management system, the management system receives the command and then gives a response to the checking device, the template number of the checked table is obtained after a plurality of seconds of delay, and the procedure judgment is carried out according to the template number; if the process is judged to pass, sending a table calibration enabling command to the checked table, and executing the step S4; if the process is judged not to pass, the management system controls the calibration device to power off the checked meter and sends a fault alarm signal, and the calibration is stopped;
s4, the checked meter sends a parameter packet to the checking device, requests the checking device to load voltage and current signals, actively checks the meter according to the meter checking scheme and the parameters stored in the checking device under the condition that the output of the checking device is stable, automatically judges whether the checking is qualified or not by combining the test data and the upper and lower limits of the error built in the checked meter, and uploads the checking data and the judgment result to the management system;
and each meter position is correspondingly provided with one checking device, and the checking devices are mutually independent and are respectively in communication connection with the management system.
2. The method according to claim 1, wherein in step S1, according to the table information to be checked, parameter setting is performed on the checking device corresponding to each table, specifically:
according to the order information of the checked meter, manually inquiring to obtain the specification information of the checked meter, and then carrying out output voltage specification setting on the calibration device corresponding to each meter position through a management system.
3. The method according to claim 1, wherein in step S3, the template number of the table to be checked is obtained after delaying for several seconds, and specifically:
the management system sends a response message to the checking device, and after delaying for a plurality of seconds, the management system actively sends an instruction for acquiring the template number of the table to be checked to the table to be checked;
after receiving the instruction, the detected table sends the template number to the management system through the checking device;
and the management system binds the detected table and the checking device according to the template number of the detected table and the address of the checking device and stores the binding information.
4. The method according to claim 1, wherein in step S4, after receiving the calibration enabling command, the table to be checked sends a parameter packet to the checking apparatus, requesting the checking apparatus to load the voltage and current signals, specifically:
after receiving the meter calibration enabling command, the meter to be tested actively sends the command to the calibration device for adjustment according to the scheme and the parameters stored in the meter to be tested, and the calibration device automatically adjusts and outputs the command and outputs voltage and current signals to the meter to be tested.
5. The method for calibrating a meter according to claim 1, wherein in step S4, the method for determining the output stability of the calibration device comprises:
after receiving the voltage and current signals loaded by the verifying device, the checked meter inquires whether the output of the verifying device is stable, and the verifying device feeds a stable result back to the checked meter according to the inquiry;
if the checked table receives the 'adjustment' instruction, the checked table resends the inquiry and waits for the check device to reply;
if the checked meter receives a success command, the meter is automatically calibrated;
if the checked meter receives the 'failure' instruction, the result is sent to the management system, the management system feeds back the checked meter and controls the power-down of the checking device, an unqualified signal is output, and the meter calibration is stopped.
6. A method for calibrating a table according to claim 1, wherein in step S4, the method for actively calibrating a table according to the table calibrating scheme and parameters stored therein comprises:
the method comprises the steps that a checked table actively controls a checking device to output voltage and current according to a test point in a checking scheme, after the checking device is stabilized, the checked table reads a voltage value U1, a current value I1 and a power value W1 output by the checking device, and meanwhile, the checked table calculates according to the voltage value, the current value and the power value which are sampled by the checked table, the current value and the power value U1, I1 and W1, calculates a difference value and a correction coefficient, and writes the difference value and the correction coefficient into a storage chip to finish checking the table.
7. The method according to claim 1, wherein the step S2 specifically comprises:
the method comprises the following steps that a corresponding meter position is hung on a detected meter, a meter hanging state signal is triggered and fed back to a checking device, the checking device starts a voltage output switch of the checking device after receiving the signal and controls a meter position state indicator lamp to display a green lamp, and the checking device outputs a rated voltage value to the detected meter to supply power to the detected meter;
or, the corresponding meter position is hung on the detected meter, the meter hanging state signal is triggered and fed back to the checking device, the checking device automatically outputs the rated voltage value to the detected meter after delaying for a plurality of seconds, the power is supplied to the detected meter, and the meter position state indicator lamp is controlled to display a green light.
8. A method of calibrating a meter as set forth in claim 1, further comprising:
and S5, the management system feeds back the judgment result to the table to be checked, if the link of the table checking is qualified, the table to be checked executes the step S4 to automatically check the table in the next link, and if the link of the table checking is unqualified, the management system controls the calibration device to be powered down and outputs an unqualified signal, and the table checking is stopped.
9. A method of calibrating a meter as set forth in claim 8, said method further comprising:
and S6, if all the meter calibrating links of the meter to be calibrated are qualified, the management system feeds back the received result to the meter to be calibrated after receiving the judgment result and the qualified total conclusion of the last meter calibrating link, controls the calibration device to be powered down, outputs a qualified signal, and manually unloads the meter to finish meter calibration.
10. A meter calibrating device comprises meter positions for placing a meter to be calibrated, and is characterized in that each meter position is correspondingly provided with a calibrating device, and each calibrating device is respectively in communication connection with the meter to be calibrated on the corresponding meter position; the checking devices are independent from each other and are respectively in communication connection with the management system; the checking device is a portable checking device, and is internally provided with a communication conversion module for mutual communication among the checking device, a checked meter and a management system, and a power source for outputting voltage and current to the checked meter; the meter calibrating device executes the meter calibrating method of any one of claims 1-9.
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