CN105116366B - Quick correction method based on adjustment meter constant - Google Patents
Quick correction method based on adjustment meter constant Download PDFInfo
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- CN105116366B CN105116366B CN201510516572.XA CN201510516572A CN105116366B CN 105116366 B CN105116366 B CN 105116366B CN 201510516572 A CN201510516572 A CN 201510516572A CN 105116366 B CN105116366 B CN 105116366B
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Abstract
The invention discloses a kind of quick correction method based on adjustment meter constant, comprise the following steps, 1）In process of production original N times is adjusted to by adjusting divide ratio the meter constant of ammeter；2）A resistance of being connected on spi bus is connected between computation chip and MCU in ammeter in ammeter, interference is eliminated or shakes；3）By software mode to ammeter calibration, the requirement of meter error is reached；4）After the completion of production correction, divide ratio is returned into normal state, and remove step 2）The resistance connected on middle spi bus, so that the meter constant of ammeter is returned to original numerical value.The present invention is adjusted to original N times in production by adjusting divide ratio the meter constant of ammeter, and eliminate interference or shake on data signal transmission spi bus, divide ratio is returned to normal state again after the completion of production correction, production efficiency and reduction production cost are greatly improved, is had a good application prospect.
Description
Technical field
The invention belongs to ammeter alignment technique field, and in particular to a kind of quick calibration side based on adjustment meter constant
Method.
Background technology
At present, three-phase intelligent ammeter on the market all completes electric energy acquisition using the special metering IC（Such as ADE7858,
ATT7022, RN8302 etc.）, still, these computation chips are soft to reach the requirement of meter error all using software regulating meter
Part calibration is used carries out calibration, inspection table according to the meter constant of ammeter, and the production cycle is long, low production efficiency, especially for small electricity
The three-phase intelligent ammeter of stream, such as 57.7V, 1.5（6）The ammeter of A specifications is under 1%In electric current, and the interval time of each pulse is big
About 70 seconds, the time of software regulating meter is considerably increased, using being inconvenient, inefficiency.
The content of the invention
Technical problem solved by the invention is the production week for overcoming three-phase intelligent ammeter on the market using software regulating meter
Phase is long, the problem of low production efficiency.The quick correction method based on adjustment meter constant mode of the present invention, passes through in production
Adjustment divide ratio the meter constant of ammeter is adjusted to original N times, then the interval time of each pulse shorten to 1/N seconds,
Divide ratio is returned to normal state again after the completion of production correction, production efficiency and reduction can be thus greatly improved
Production cost, has a good application prospect.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of quick correction method based on adjustment meter constant, it is characterised in that：Comprise the following steps,
Step（1）, original N times is adjusted to by adjusting divide ratio the meter constant of ammeter in process of production,
Two adjacent interpulse periods are made to shorten to original 1/N times；
Step（2）, connected on spi bus a resistance, resistance are connected between computation chip and MCU in ammeter in ammeter
With the parasitic capacitance on computation chip, low pass filter is constituted, interference or shake on spi bus is eliminated；
Step（3）, by software mode to ammeter calibration, reach the requirement of meter error；
Step（4）, after the completion of production correction, divide ratio is returned into normal state, and remove step（2）In
The resistance connected on spi bus, so that the meter constant of ammeter is returned to original numerical value.
The foregoing quick correction method based on adjustment meter constant, it is characterised in that：The value of the N is between 2-4.
The foregoing quick correction method based on adjustment meter constant, it is characterised in that：Step（1）, in process of production
It is that computation chip is each in short circuit ammeter by adjusting divide ratio the meter constant of ammeter is adjusted to N times original of method
The pin of frequency divider is realized.
The foregoing quick correction method based on adjustment meter constant, it is characterised in that：Step（2）, measured in ammeter
A resistance of being connected on spi bus is connected between chip and MCU in ammeter, resistance is 10 ~ 100 Ω.
The foregoing quick correction method based on adjustment meter constant, it is characterised in that：Step（4）, corrected in production
Cheng Hou, the method that divide ratio is returned into normal state is that the short circuit of each frequency divider of computation chip draws in disconnection ammeter
Pin is realized.
The foregoing quick correction method based on adjustment meter constant, it is characterised in that：Step（2）, measured in ammeter
An electric capacity in parallel on spi bus is connected between chip and MCU in ammeter, capacitance is 10pF.
The beneficial effects of the invention are as follows：The quick correction method based on adjustment meter constant of the present invention is logical in production
Cross adjustment divide ratio the meter constant of ammeter is adjusted to original N times, then the interval time of each pulse shorten to 1/N
Second, and interference or shake on data signal transmission spi bus are eliminated, divide ratio is returned to again after the completion of production correction
Normal state, can thus greatly improve production efficiency and reduction production cost, have a good application prospect.
Brief description of the drawings
Fig. 1 is the flow chart of the quick correction method based on adjustment meter constant of the present invention.
Fig. 2 is the circuit diagram of the interference eliminated on spi bus the or shake of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in figure 1, the quick correction method based on adjustment meter constant of the present invention, is divided in production by adjusting
The meter constant of ammeter is adjusted to original N times by coefficient, then the interval time of each pulse shorten to 1/N seconds, and eliminates number
It is believed that divide ratio, normal state is returned to after the completion of production correction by interference or shake on number transmission spi bus again,
Production efficiency and reduction production cost can be thus greatly improved, following steps are specifically included,
Step（1）, original N times is adjusted to by adjusting divide ratio the meter constant of ammeter in process of production,
Two adjacent interpulse periods is shorten to original 1/N times, N is Clock Multiplier Factor, such as, inside ammeter from 64
Frequency dividing is adjusted to 16 frequency dividings, and equivalent in the case of equal input, electrical energy pulse frequency expands 4 times, while correction platform
Meter constant also simultaneously expand 4 times, by short circuit ammeter each frequency divider of computation chip pin realize, in order to reduce ammeter
The saltus step of error, Clock Multiplier Factor N can not set too big, and value 2-4 is proper, and the error amount before and after frequency multiplication changes<
0.01%, it can be ignored, moreover, the divider ratio of the high-frequency impulse in original ammeter requires that energy is evenly divisible by N, so may be used substantially
To avoid the error change that pulse mantissa brings
Step（2）, connected on spi bus a resistance, resistance are connected between computation chip and MCU in ammeter in ammeter
With the parasitic capacitance on computation chip, constitute low pass filter, eliminate spi bus on interference or shake, resistance be 10 ~
100 Ω, can also connect an electric capacity in parallel on spi bus in ammeter between computation chip and MCU in ammeter, capacitance is
10pF, raising filter effect, circuit diagram, as shown in Fig. 2 here for resistance, the selection of capacitance, be according to spi bus
What speed and outside MCU signal were carried out；
Step（3）, by software mode to ammeter calibration, reach the requirement of meter error；
Step（4）, after the completion of production correction, the pin for disconnecting the short circuit of each frequency divider of computation chip in ammeter is realized,
Divide ratio is returned into normal state, and removes step（2）The resistance connected on middle spi bus, if in parallel on spi bus
There is electric capacity, also remove electric capacity, so that the meter constant of ammeter is returned to original numerical value.
According to the quick correction method based on adjustment meter constant of the present invention, 1 embodiment, such as specification are 3 × 57.7/
100V, 1.5 (6) A three-phase and four-line intelligent electric meter, normal meter constant is 20000imp/kwh, if verified in production
It is corrected and inspection table by 20000 imp/kwh constants in journey, every ammeter substantially needs 30 minutes, but if passing through adjustment
The constant of intelligent electric meter is amplified 4 times by divide ratio, then the time of debugging and inspection table can just shorten to original 1/4, i.e.,
Correction, inspection table time were shortened to less than 8 minutes, and original state divide ratio is returned to again after the completion of production, thus may be used
To greatly improve production efficiency and reduction production cost.
In summary, the quick correction method of the invention based on adjustment meter constant, is divided in production by adjusting
The meter constant of ammeter is adjusted to original N times by coefficient, then the interval time of each pulse shorten to 1/N seconds, and eliminates number
It is believed that divide ratio, normal state is returned to after the completion of production correction by interference or shake on number transmission spi bus again,
Production efficiency and reduction production cost can be thus greatly improved, is had a good application prospect.
General principle, principal character and the advantage of the present invention has been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (6)
1. a kind of quick correction method based on adjustment meter constant, it is characterised in that：Comprise the following steps,
Step（1）, original N times is adjusted to by adjusting divide ratio the meter constant of ammeter in process of production, makes phase
Two adjacent interpulse periods shorten to original 1/N times；
Step（2）, a resistance of being connected on spi bus, resistance and meter are connected between computation chip and MCU in ammeter in ammeter
The parasitic capacitance on chip is measured, low pass filter is constituted, interference or shake on spi bus is eliminated；
Step（3）, by software mode to ammeter calibration, reach the requirement of meter error；
Step（4）, after the completion of production correction, divide ratio is returned into normal state, and remove step（2）Middle SPI is total
The resistance connected on line, so that the meter constant of ammeter is returned to original numerical value.
2. the quick correction method according to claim 1 based on adjustment meter constant, it is characterised in that：The N's takes
It is worth between 2-4.
3. the quick correction method according to claim 1 based on adjustment meter constant, it is characterised in that：Step（1）,
The meter constant of ammeter, which is adjusted to N times original of method, by adjusting divide ratio in production process is, in short circuit ammeter
The pin of each frequency divider of computation chip is realized.
4. the quick correction method according to claim 1 based on adjustment meter constant, it is characterised in that：Step（2）,
A resistance of being connected on spi bus is connected in ammeter between computation chip and MCU in ammeter, resistance is 10 ~ 100 Ω.
5. the quick correction method according to claim 1 based on adjustment meter constant, it is characterised in that：Step（4）,
After the completion of production correction, the method that divide ratio is returned into normal state is to disconnect each frequency divider of computation chip in ammeter
Short circuit pin realize.
6. the quick correction method according to claim 1 based on adjustment meter constant, it is characterised in that：Step（2）, will
Each wire in ammeter in computation chip and ammeter between MCU in connection spi bus passes through capacity earth, the electric capacity of each electric capacity
It is worth for 10pF.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107015188A (en) * | 2017-05-23 | 2017-08-04 | 国网山东省电力公司电力科学研究院 | A kind of method and measurement, verification system for shortening the harmonic electric energy error measure time |
| CN109884573B (en) * | 2019-03-13 | 2021-05-11 | 宁波三星医疗电气股份有限公司 | Method for testing electric energy meter |
| CN110763890B (en) * | 2019-09-29 | 2022-09-09 | 许昌许继软件技术有限公司 | Metering device |
| CN112748271B (en) * | 2020-12-01 | 2022-11-04 | 宁波三星医疗电气股份有限公司 | Electric energy meter and electric quantity metering method thereof |
| CN113433509B (en) * | 2021-07-02 | 2022-12-02 | 威胜集团有限公司 | Calibration method of metering ammeter, electric energy meter and storage medium |
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|---|---|---|---|---|
| EP0569740A1 (en) * | 1992-05-12 | 1993-11-18 | Landis & Gyr Technology Innovation AG | Method for automatic calibration of electricity meters and apparatus therefor |
| CN2261029Y (en) * | 1996-10-09 | 1997-08-27 | 毛晋 | Comprehensive calibrator for electric measuring device |
| CN101359042A (en) * | 2008-09-11 | 2009-02-04 | 江苏卡欧万泓电子有限公司 | Auto calibration method for single-phase electronic type electric energy meter |
| CN101655545A (en) * | 2009-09-02 | 2010-02-24 | 珠海市科荟电器有限公司 | On-site verifying method of electric energy meter |
| CN102636769A (en) * | 2012-04-18 | 2012-08-15 | 山东电力研究院 | Error counter for electric energy meter and error counting method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07117449B2 (en) * | 1987-07-31 | 1995-12-18 | アンリツ株式会社 | Optical power meter calibration device |
| SE0000074L (en) * | 2000-01-13 | 2001-07-14 | Abb Ab | Electricity meter |
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- 2015-08-21 CN CN201510516572.XA patent/CN105116366B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0569740A1 (en) * | 1992-05-12 | 1993-11-18 | Landis & Gyr Technology Innovation AG | Method for automatic calibration of electricity meters and apparatus therefor |
| CN2261029Y (en) * | 1996-10-09 | 1997-08-27 | 毛晋 | Comprehensive calibrator for electric measuring device |
| CN101359042A (en) * | 2008-09-11 | 2009-02-04 | 江苏卡欧万泓电子有限公司 | Auto calibration method for single-phase electronic type electric energy meter |
| CN101655545A (en) * | 2009-09-02 | 2010-02-24 | 珠海市科荟电器有限公司 | On-site verifying method of electric energy meter |
| CN102636769A (en) * | 2012-04-18 | 2012-08-15 | 山东电力研究院 | Error counter for electric energy meter and error counting method |
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