Verification Regulation of Multi-Rate Alternating -Current Watthour Meters
Some standard content:
Time-sharing (multi-rate) watt-hour meter
Verification procedure
JJG691—1990
Time-sharing [multi-rate]
Verification procedure for watt-hour meters
Verification Hegulatinn or ialli-HaleAllurdating-Current Wothcur Melers.1JG 6U1--1X0
This standard regulation was approved by the State Technical Supervision Commission on June 14, 1991, and will be implemented from October 1, 1911. The responsible unit is: Jiangning Provincial Planning Commission
Drafting unit: Beijing Electric Power Testing and Construction Institute
The technical provisions of this regulation are issued by the responsible unit and the main drafter of this regulation is:
Lan Yonglin
(Northeast Electric Power Testing and Research Institute)
Technical requirements·
Verification conditions and verification items
Verification methods
Verification results are known to the business plan….
Time-sharing meter verification regulation 2 New production, repair and use of household ultra-wide room is 5 doors E2H! The control system of the energy meter composed of the energy pulse meter and the quality control time switch is a separate or integrated time-sharing meter for active and reactive energy. The following are the technical requirements: 1. The markings on the energy meter should comply with the markings of the manufacturer or the relevant technical requirements. 2. The basic error of the energy meter should not exceed the basic error limit of the load time-sharing meter specified in Table 1 and Table 2. The basic error of the load time-sharing meter is 1..h.
ww-n.5.2 ... Note: One is the power: ..—is the power of the power meter. The power meter is accurate. Its basic error point is still the total error point: $phase power scanning power cabinet E
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: the flat collection refers to the annual collection of a piece of electricity, the electric energy support one electric efficiency scale wash load electricity market ±4.x.
use the whole of the five components of electricity: applicable to and type function: reactive power operation in the weC=0. work, ws03.5 reduction parts 1, sin use F positive element energy. Submersible
when the road is no load outflow and the pressure road is added, that is, %0 is still symmetrical with a certain voltage, the annual energy meter is relatively polar pin movement shall not exceed (turn)
4 starting
Under the condition of rated voltage: rated power and 1 (for power meter) r1.1 (for power meter), when the load current exceeds the requirements of Table 3, the meter dial rotates continuously, and Table 3 records the time of the meter's starting current
and the time of the power generation service level
Whether there is a reverse current
and the crystal lifting time switch
is closed for quality control, and the digital display of the device does not show the time of the whole time. These two times are called the shortest time of the switch and the meter Time error and time period according to the error, the result does not exceed the table 4 period, the overall 4 quantitative time dividend daily calculation error and ratio period investment error quality control time H related categories
period (in)
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public wood ratio any beauty situation, the children received 6.5 design product wear time opening, production. The retention rate specification reading 16, time not || tt||Time related products shall be inspected and measured in accordance with the factory's time base toughness) and time technical verification and measurement parts: 6 control inductive components of the electric energy meter or digital display clock group, the time-sharing electric energy meter control circuit shall meet the following requirements 6, 1 when there is load power, the speed conversion circuit shall output a pulse number that is proportional to the speed of the electric energy meter, and the gradient (valley) meter shall be recorded accurately. For this purpose, there should be a convenient pulse number detection part, which can be used as a time discriminator. The turntable should not output any stocks when it rotates within 6 meters. 6.2 No-load current, the selector (valley) meter should not count "affected by the same voltage, Lan 1 (except when the power supply is running)
7.1 When the power supply voltage changes within the range of %-115T, the quality control time switch and the frequency control device or static switch and control circuit of the selector (valley) should always be able to operate, relay or static switch device, when the voltage it withstands is lower than 35% of the rated upper voltage, the difference will return immediately, 7.2 After the voltage is cut off, during the working reserve period provided by the battery (the working reserve is not less than 720b?) and the power supply voltage is quickly restored, the quality control time switch and control circuit function should remain stopped. 8T frequency withstand voltage
At room temperature and air humidity of 80% for group 4 and comparison group electric energy meters) or 95% (for group A and group B electric energy meters), the integral and separate time-sharing meters The watt-hour meter can withstand the actual positive AC current (effective: 5 kV) with a test rate of 61 kV. 8.1 The test voltage between the voltage and current line and the AC power supply line to the casing of the insulated material is 2 kV: the test voltage between the line above 20 V and the external line is 500 V. 8.2 The test voltage between the voltage line and the current system and the current load of different sciences is 100 V. 2. Verification and verification items
9 Verification equipment
The conditions for determining the basic error, creeping and starting of the time-sharing watt-hour meter shall comply with the current standard of the AC watt-hour meter (watt-hour meter) (JJG307-1988, Section 1) and the relevant provisions of JG597-1911.
The verification conditions of the crystal-controlled time switch shall comply with the provisions of Table 5. Table 5 The most controlled time switch test component category
Environmental change
Electric pressure
Inhibition degree
Dispatching time Kun
Li comparison conditions
Table Rated frequency
Temperature production
1.Working parts
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(nF--.15) [,
50 160) H +0., 5F
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10.1 frequency test:
10.2 point observation inspection;
10.3 inspection quality control time and close
11.4 inspection control seven ways:
1,5 determine and source r-interruption influence:|| tt||10.5 Dynamic test;
10.7 Starting test;
Determine the error of a certain device:
10.9 Check the micro-digit and the basic display of the meter.
11T Test bed test
Three verification methods
11.1 The new voltage test device, the high-voltage side capacity is less than 500VA, can smoothly increase the test voltage from zero to the specified value, and the test voltage waveform is an actual positive wave.
11.2 Add a 2kV two-sensitivity card to all connected voltage and current lines, AC power line terminals and the grounding screws or nails of the shell, and the bottom of the electric energy meter. The meter will do its best to connect the terminal core wiring screws to the position of the largest diameter wire, and the terminal box is good. When conducting the power frequency withstand voltage test between non-power supply lines, apply a 60V power frequency voltage to all the connected power lines (including AC power lines) and the current cables (note that the power lines in the box and the current lines are paralleled). Apply a 500V power frequency voltage to the switch line with a working voltage not higher than 40V, and between the power lines in the box and the metal parts of the outer shell (ground). When conducting the above withstand voltage test, the load circuit not under test is reversely connected to the external metal parts (ground): 11.3 The test voltage is maintained at a constant rate within 5-1ks and the insulation should not be damaged. After the test voltage is reduced to zero at the same speed.
During the withstand voltage test, if there is noise and vibration of the turntable, it cannot be considered that the insulation is broken down. 12 Visual inspection
Carry out external inspection on each time-sharing electric energy meter, and take out 5 time-sharing electric energy meters for internal inspection. If defects are found, double sampling is required: if there are still defects: all time-sharing electric energy meters need to be inspected.
Time-sharing electric meters with the following defects must be inspected and re-calibrated after passing the inspection: 12.1 There are the defects mentioned in Article 12.1 of J307-15, and the marking does not meet the relevant standard requirements: the time switch has no line diagram or the line diagram does not match the button mark, and the specified power supply voltage is different from the specified voltage of the meter scale voltage line.
Time! The dial light is marked with the direction of rotation or cannot rotate, the pointer position or the mark between the teeth is not correct, the time signal board is not displayed correctly.
12.2 The wiring is not neat, the connection is bad, and the circuit board is not clean or there is a short circuit, burning marks, and the work is not checked. The measured voltage is not normal. 13 Inspection quality control time!
13.1 Determine the time difference, and connect the leakage rate control hole of the crystal control switch or the group, and connect the input end of the monthly test instrument (monthly calibration meter) with a timing error of 723
0 or 053d: start measuring the time code by powering on, and repeat it 10 times. Each test takes 1m, and the average multiple of the 10 times is used to determine the result early, The instantaneous product error
is obtained by testing the instrument for light day. The time control instrument can be connected to the end of the operation for 72 hours. According to the time signal of the user, the error is measured once every 24 hours. The error of 5 times is divided by 3 to obtain the average daily time error. You can also use the standard time or the electric counter (digital frequency meter) with an accuracy rate of not less than 3%.
13.2 Determine the time error of the time period
In the preset time period, use the actual time obtained by your standard clock or station report, and compare the start (end) time to obtain the time period switching error: on the dial display, all the time periods need to be tested, and the start (end) time is displayed separately. The virtual time signal is immediately displayed (eliminated) ||tt ||13.3 Determine the action voltage of the internal fire switch of the driving meter. Balance the power supply voltage until the relay operates: the sound plate is switched on and off for more than 10 times, and the value before each switching is about 5%. The relay should be able to operate. Check the relevant signals to make sure they are correct. The voltage that makes the relay group just able to operate is called the starting voltage. This voltage cannot exceed the rated working voltage of the relay. The voltage value is steadily reduced to the relay instantaneous return voltage. Repeat the test 3 times. The return voltage obtained in this way is not less than 35% of the rated voltage.
14 Check the control circuit
14.1 Load inspection
4.1.1 Under the following circumstances, the peak voltage [ The number of pulses counted by the meter is proportional to the number of revolutions (a pulse counting error is allowed).
a) The voltage of the electric energy meter is set. When the power efficiency is 1, the power line passes 5% of the rated current, which makes the current in the power meter switch for 2 revolutions, and then drops to 5% of the rated current for 11 revolutions. This cycle is repeated for 5 years. The current loop remains open during the current conversion. During the meter starting test, the number of pulses proportional to the number of revolutions is detected: a) The current line passes 5%·-1% of the rated current, and the power line is the power supply voltage of the control circuit and the intermediate switch. Under the condition of a power factor of 4, the control circuit and the intermediate switch are tested for the operating state. For this purpose, the voltage is changed from 115% of the value to 8, the turntable rotates for 5 revolutions and the voltage changes to the initial value, then let the turntable rotate 5 revolutions, and repeat the cycle 5 times. At the moment of voltage change: the voltage circuit shall not be disconnected. 14.1.2 For the time-sharing electric energy meter with a directional closed-rate detector, add a set voltage corresponding to the rated current, the power factor is 1, change the current direction, and the turntable rotates 5 times within 360 degrees. There should be no pulse output. 14.2 Yuan fee control check
When the current and the circuit are small and there is no creeping, under the following circumstances, there is no pulse drive noise (valley: meter counts,) the power line is repeatedly connected to the rated power supply for 1 month, and the power-on and power-off time is not less than 5%E) The power line is added with a set voltage, and an appropriate section is used to generate a new ink 1 5 interval switching time, the situation continues to test 3mine
15 to confirm the impact of power interruption
cover the power supply channel to cut off the rated voltage 3 times, the full power analysis power interruption duration is not less than [m, check the power of the control unit, preset time and common related signals are the capacity of this regulation 10,6-[0. Release and [.3] in the calibration part, according to JG3-198s Article 13 to 18 of the risk determination,
1 pole meter reading
when there is no flat section, there can be a total transformer time-sharing meter, add the maximum load to run for a period of time, so that the peak capacity period is switched at least once, the gates of each meter reading should meet the following requirements The following requirements are required: ww
formula: W
peak meter reading;
valley meter reading:
total meter reading:
total vertical meter reading;
known number, the pulse efficiency of the turntable per revolution>1 and the small position efficiency of each meter, when the number of pulses stored in the peak (valley) period reaches the preset value, the peak (capacity) meter terminal wheel will step 1/10 of the cycle 6≤1.6: other circumstances, *0.8. Check the meter reading to know the meter constant. The first calibration and periodic calibration can be carried out at random: take a certain number of sub-meters (called 56 samplings based on the total number of meters submitted for calibration, not less than 3 units), and test In addition to the daily time error and control circuit, if it is found that the non-qualified ones are not allowed to leave the factory and use, it should also be doubled for inspection: if there are still unqualified ones after the additional inspection, it will be determined. The fourth verification result is cumulative processing and verification cycle
17 Correct result processing
. 1 According to the limit table 6, the last digit of various errors of the time-sharing meter is the integer of the rounding interval, and the rounding interval
rounding question
electric energy standard and grade
including the time example piece related to the accuracy of the time limit
time period setting ticket
need to correct the relative error of the electric energy meter, first consider whether the standard instrument or fast setting device has been used to correct the final error, and then perform the error correction. Judge the various errors through the value, and take the result after rounding as the deduction. 1.2 The electric energy meter that has passed the requirements of this regulation shall be sealed by the certification unit: those without the certification are not allowed to leave the factory, and those with the certification shall not be used.
I7.3 For the time-sharing electric energy meter that violates the clock and rush timing, the qualified ones shall be issued with a "calibration certificate", and the unqualified ones shall be issued with a "construction conclusion notice".
The first calibration shall be issued with a "calibration certificate"; if the calibration period is more than the standard, the calibration certificate shall be marked on the time-sharing meter.
18 The calibration period
The control (rotation) interval of the separate and integrated time-sharing electric energy meter shall comply with the provisions of Article 20 of 3IG307-[98: The average annual error shall be changed at least once. 7252 Determine the time-slot switching error
In the preset time period, use the actual time obtained by your standard clock or station report, and compare it with the start (end) time: the time-slot switching error is obtained: on the dial display, all time periods must be checked, and the start (end) time is released. The virtual time signal is immediately displayed (eliminated)
13.3 Determine the action voltage of the internal electrical fire switch of the driving counter. Balance the power supply voltage until the relay is automatically operated: the sound plate is switched on and off more than 10 times, and the error before each time is about 5%. The relay should be able to operate. Observe the relevant signals to ensure that they are correct. The voltage that allows the relay group to just be able to operate is called the starting voltage. This voltage cannot exceed % of the rated working voltage of the relay. The voltage value of the fixed voltage is stable and the relay returns instantly. Repeat the test 3 times. The return voltage value obtained in this way shall not be less than 35% of the fixed voltage value.
14 Check the control circuit
14.1 Load inspection
4.1.1 Under the following conditions, the number of pulses counted by the peak and valley meter is proportional to the number of revolutions (1 pulse counting error is allowed).
a) When the voltage of the electric energy meter is loaded and the power efficiency is 1, the power line passes 5% of the rated current, which makes the relay turn 2 revolutions, that is, the rated current is reduced to 5% of the rated current for 11 revolutions. The current loop remains open during the current conversion. During the start-up test, the number of pulses proportional to the number of revolutions is detected: the current line is 5%·-1% rated current, the line is trained to change the power supply voltage (this power supply voltage is the power supply voltage of the control circuit and the switch), and the control circuit and the switch are tested for the action condition under the condition of the power supply voltage of 4. To do this, the voltage is changed from 115% of the value to 8, and the voltage is changed to the initial value after the turntable rotates for 5 revolutions, and then the turntable rotates for 5 revolutions, and the cycle is repeated 5 times. At the moment of voltage change: the voltage circuit must not be disconnected. 14.1.2 For the time-sharing electric energy meter with a closed-loop differential device, add a set voltage corresponding to the rated current, the power factor is 1, change the flow direction, and the turntable rotates 5 times within 360 degrees. There should be no pulse input. 14.2 The flow control check
current and the path current are free from creeping. Under the following circumstances, there is no pulse driving noise (valley: meter counting,) the power line is repeatedly disconnected for 1 month at rated power, and the power-on and power-off time is not less than 5%E) the power line adds a set voltage, and uses an appropriate interval of 15 seconds to change the time. After the test, it is confirmed that the power interruption has an impact on the power supply. The rated voltage is cut off for 3 times, and the full-power cut-off duration is not less than [m. Check the power of the control station, the preset time and the related signals. It is the calibration part of the capacity in Article 10.6-[0.1 and Article 1.3 of this regulation. According to Articles 13 to 18 of JG3-198s, when there is no flat section on the meter reading, there can be a time-sharing electric energy meter with a total transformer, add a certain maximum load to run for a period of time, so that the peak capacity period is switched at least once, and the gates of each meter reading should meet the following requirements: ww
type: W
peak meter reading;
Valley meter indication:
Total meter indication:
Total meter indication;
Known number, the pulse efficiency of each turntable is >1 and the position efficiency of each meter is the same. When the number of pulses stored in the valley time period reaches the preset value, the peak (capacity) meter terminal wheel will step 1/10 of the circle. 6≤1.6: In other cases, *0.8. Check the meter indication to know the meter constant. The first calibration and periodic calibration can be carried out at random: take a certain number of sub-meters (based on 56 of the total number of meters submitted for calibration, not less than 3 units), detect their daily time error and control circuit, and find that there is no In addition to the failure to leave the factory and use, the double sampling should be carried out: if there are still unqualified ones after the additional inspection, the result will be corrected. 4. Cumulative processing of verification results and verification cycle
17. Correct result processing
1. According to the limit table 6, the last digit of various errors of the time-sharing meter shall be the integer of the rounding interval, and the rounding interval shall be the integer of the rounding interval. The electric energy standard and the level
include the time example and the relevant accuracy and efficiency
time period setting ticket
need to correct the relative error of the electric energy meter. First consider whether the standard instrument or fast setting device has been used to correct the error. After the error correction, the result is corrected. The judgment of various errors is the value of the value, and the result after rounding is used as the deduction. 1.2 The electric energy meter that has passed the requirements of this regulation shall be sealed by the certification unit: those without the certification are not allowed to leave the factory, and those with the certification shall not be used.
I7.3 For the time-sharing electric energy meter that violates the clock and rush timing, the qualified ones shall be issued with a "calibration certificate", and the unqualified ones shall be issued with a "construction conclusion notice".
The first calibration shall be issued with a "calibration certificate"; if the calibration period is more than the standard, the calibration certificate shall be marked on the time-sharing meter.
18 The calibration period
The control (rotation) interval of the separate and integrated time-sharing electric energy meter shall comply with the provisions of Article 20 of 3IG307-[98: The average annual error shall be changed at least once. 7252 Determine the time-slot switching error
In the preset time period, use the actual time obtained by your standard clock or station report, and compare it with the start (end) time: the time-slot switching error is obtained: on the dial display, all time periods must be checked, and the start (end) time is released. The virtual time signal is immediately displayed (eliminated) www.bzxz.net
13.3 Determine the action voltage of the internal electrical fire switch of the driving counter. Balance the power supply voltage until the relay is automatically operated: the sound plate is switched on and off more than 10 times, and the error before each time is about 5%. The relay should be able to operate. Observe the relevant signals to ensure that they are correct. The voltage that allows the relay group to just be able to operate is called the starting voltage. This voltage cannot exceed % of the rated working voltage of the relay. The voltage value of the fixed voltage is stable and the relay returns instantly. Repeat the test 3 times. The return voltage value obtained in this way shall not be less than 35% of the fixed voltage value.
14 Check the control circuit
14.1 Load inspection
4.1.1 Under the following conditions, the number of pulses counted by the peak and valley meter is proportional to the number of revolutions (1 pulse counting error is allowed).
a) When the voltage of the electric energy meter is loaded and the power efficiency is 1, the power line passes 5% of the rated current, which makes the relay turn 2 revolutions, that is, the rated current is reduced to 5% of the rated current for 11 revolutions. The current loop remains open during the current conversion. During the start-up test, the number of pulses proportional to the number of revolutions is detected: the current line is 5%·-1% rated current, the line is trained to change the power supply voltage (this power supply voltage is the power supply voltage of the control circuit and the switch), and the control circuit and the switch are tested for the action condition under the condition of the power supply voltage of 4. To do this, the voltage is changed from 115% of the value to 8, and the voltage is changed to the initial value after the turntable rotates for 5 revolutions, and then the turntable rotates for 5 revolutions, and the cycle is repeated 5 times. At the moment of voltage change: the voltage circuit must not be disconnected. 14.1.2 For the time-sharing electric energy meter with a closed-loop differential device, add a set voltage corresponding to the rated current, the power factor is 1, change the flow direction, and the turntable rotates 5 times within 360 degrees. There should be no pulse input. 14.2 The flow control check
current and the path current are free from creeping. Under the following circumstances, there is no pulse driving noise (valley: meter counting,) the power line is repeatedly disconnected for 1 month at rated power, and the power-on and power-off time is not less than 5%E) the power line adds a set voltage, and uses an appropriate interval of 15 seconds to change the time. After the test, it is confirmed that the power interruption has an impact on the power supply. The rated voltage is cut off for 3 times, and the full-power cut-off duration is not less than [m. Check the power of the control station, the preset time and the related signals. It is the calibration part of the capacity in Article 10.6-[0.1 and Article 1.3 of this regulation. According to Articles 13 to 18 of JG3-198s, when there is no flat section on the meter reading, there can be a time-sharing electric energy meter with a total transformer, add a certain maximum load to run for a period of time, so that the peak capacity period is switched at least once, and the gates of each meter reading should meet the following requirements: ww
type: W
peak meter reading;
Valley meter indication:
Total meter indication:
Total meter indication;
Known number, the pulse efficiency of each turntable is >1 and the position efficiency of each meter is the same. When the number of pulses stored in the valley time period reaches the preset value, the peak (capacity) meter terminal wheel will step 1/10 of the circle. 6≤1.6: In other cases, *0.8. Check the meter indication to know the meter constant. The first calibration and periodic calibration can be carried out at random: take a certain number of sub-meters (based on 56 of the total number of meters submitted for calibration, not less than 3 units), detect their daily time error and control circuit, and find that there is no In addition to the failure to leave the factory and use, the double sampling should be carried out: if there are still unqualified ones after the additional inspection, the result will be corrected. 4. Cumulative processing of verification results and verification cycle
17. Correct result processing
1. According to the limit table 6, the last digit of various errors of the time-sharing meter shall be the integer of the rounding interval, and the rounding interval shall be the integer of the rounding interval. The electric energy standard and the level
include the time example and the relevant accuracy and efficiency
time period setting ticket
need to correct the relative error of the electric energy meter. First consider whether the standard instrument or fast setting device has been used to correct the error. After the error correction, the result is corrected. The judgment of various errors is the value of the value, and the result after rounding is used as the deduction. 1.2 The electric energy meter that has passed the requirements of this regulation shall be sealed by the certification unit: those without the certification are not allowed to leave the factory, and those with the certification shall not be used.
I7.3 For the time-sharing electric energy meter that violates the clock and rush timing, the qualified ones shall be issued with a "calibration certificate", and the unqualified ones shall be issued with a "construction conclusion notice".
The first calibration shall be issued with a "calibration certificate"; if the calibration period is more than the standard, the calibration certificate shall be marked on the time-sharing meter.
18 The calibration period
The control (rotation) interval of the separate and integrated time-sharing electric energy meter shall comply with the provisions of Article 20 of 3IG307-[98: The average annual error shall be changed at least once. 725Check the meter readings and know the meter constants. The first calibration and periodic calibration can be carried out at the same time. A certain number of sub-meters (56 samples of the total number of meters submitted for calibration, not less than 3) can be randomly selected to test their daily time errors and control circuits. If any unqualified ones are found, they are not allowed to leave the factory or be used. Double sampling should be carried out. If there are still unqualified ones after repeated inspections, they will be graded. Cumulative processing of calibration results and calibration cycle
17 Appropriate result processing ||t 1. According to the provisions of Table 6, the last digit of various errors of the time-sharing meter shall be the integer of the rounding interval. The rounding interval shall be the integer of the rounding interval. The electric energy standard and the level of the time-sharing meter shall be corrected. The relative error of the electric energy meter shall be corrected. First, consider whether the standard meter or the fast setting device has been used to correct the error. The error correction is determined by the value of the rounding interval. The result after rounding is used as the deduction. 1.2 The electric energy meter that has passed the requirements of this regulation shall be sealed by the certification unit: those without the certification are not allowed to leave the factory, and those with the certification shall not be used.
I7.3 For the time-sharing electric energy meter that violates the clock and rush timing, the qualified ones shall be issued with a "calibration certificate", and the unqualified ones shall be issued with a "construction conclusion notice".
The first calibration shall be issued with a "calibration certificate"; if the calibration period is more than the standard, the calibration certificate shall be marked on the time-sharing meter.
18 The calibration period
The control (rotation) interval of the separate and integrated time-sharing electric energy meter shall comply with the provisions of Article 20 of 3IG307-[98: The average annual error shall be changed at least once. 725Check the meter readings and know the meter constants. The first calibration and periodic calibration can be carried out at the same time. A certain number of sub-meters (56 samples of the total number of meters submitted for calibration, not less than 3) can be randomly selected to test their daily time errors and control circuits. If any unqualified ones are found, they are not allowed to leave the factory or be used. Double sampling should be carried out. If there are still unqualified ones after repeated inspections, they will be graded. Cumulative processing of calibration results and calibration cycle
17 Appropriate result processing ||t 1. According to the provisions of Table 6, the last digit of various errors of the time-sharing meter shall be the integer of the rounding interval. The rounding interval shall be the integer of the rounding interval. The electric energy standard and the level of the time-sharing meter shall be corrected. The relative error of the electric energy meter shall be corrected. First, consider whether the standard meter or the fast setting device has been used to correct the error. The error correction is determined by the value of the rounding interval. The result after rounding is used as the deduction. 1.2 The electric energy meter that has passed the requirements of this regulation shall be sealed by the certification unit: those without the certification are not allowed to leave the factory, and those with the certification shall not be used.
I7.3 For the time-sharing electric energy meter that violates the clock and rush timing, the qualified ones shall be issued with a "calibration certificate", and the unqualified ones shall be issued with a "construction conclusion notice".
The first calibration shall be issued with a "calibration certificate"; if the calibration period is more than the standard, the calibration certificate shall be marked on the time-sharing meter.
18 The calibration period
The control (rotation) interval of the separate and integrated time-sharing electric energy meter shall comply with the provisions of Article 20 of 3IG307-[98: The average annual error shall be changed at least once. 725
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