CN105116366A - Quick calibration method based on pulse constant adjustment - Google Patents
Quick calibration method based on pulse constant adjustment Download PDFInfo
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- CN105116366A CN105116366A CN201510516572.XA CN201510516572A CN105116366A CN 105116366 A CN105116366 A CN 105116366A CN 201510516572 A CN201510516572 A CN 201510516572A CN 105116366 A CN105116366 A CN 105116366A
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Abstract
The invention discloses a quick calibration method based on pulse constant adjustment. The method comprises the steps that 1) the pulse constant of an ammeter is adjusted to original N times by adjusting a frequency division coefficient in a production process; 2) a resistor is connected in series with a connection SPI bus between a metering chip in the ammeter and an MCU in the ammeter to eliminate interference or jitter; 3) ammeter calibration is carried out through software to meet the requirement of a meter error; and 4) after production correction is completed, the frequency division coefficient is returned to a normal state, and the resistor which is connected in series with the SPI bus in the step 2) is removed, so that the pulse constant of the ammeter is returned to an original value. According to the invention, the pulse constant of the ammeter is adjusted to original N times by adjusting the frequency division coefficient in production; interference or jitter on the data signal transmission SPI bus is eliminated; after production correction is completed, the frequency division coefficient is returned to the normal state; the production efficiency is substantially improved; the production cost is reduced; and the method has a good application prospect.
Description
Technical field
The invention belongs to ammeter alignment technique field, be specifically related to a kind of quick correction method based on adjustment meter constant.
Background technology
At present, three-phase intelligent ammeter on the market all adopts the special metering IC to complete electric energy acquisition (as ADE7858, ATT7022, RN8302 etc.), but, these computation chips all adopt software regulating meter, to reach the requirement of table meter error, software regulating meter adopts and carries out calibration according to the meter constant of ammeter, inspection table, production cycle is long, production efficiency is low, especially for the three-phase intelligent ammeter of small area analysis, as 57.7V, 1.5(6) ammeter of A specification is under the electric current of 1%In, the interval time of each pulse is approximately 70 seconds, considerably increase the time of software regulating meter, it is very inconvenient to use, inefficiency.
Summary of the invention
Technical matters solved by the invention is that the three-phase intelligent ammeter overcome on the market adopts the production cycle of software regulating meter long, the problem that production efficiency is low.Quick correction method based on adjustment meter constant mode of the present invention, by adjustment divide ratio, the meter constant of ammeter is adjusted to original N doubly when producing, then shorten to 1/N second interval time of each pulse, after production correction completes, again divide ratio is returned to normal state, so just can significantly enhance productivity and reduce production cost, have a good application prospect.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
Based on a quick correction method for adjustment meter constant, it is characterized in that: comprise the following steps,
Step (1), adjusts to original N doubly by adjustment divide ratio the meter constant of ammeter in process of production, makes to shorten to original 1/N two adjacent interpulse periods doubly;
Step (2), is connected a resistance that spi bus connects in ammeter between computation chip with MCU in ammeter, the stray capacitance on resistance and computation chip, forms low-pass filter, eliminate the interference on spi bus or shake;
Step (3), by software mode to ammeter calibration, reaches the requirement of table meter error;
Step (4), after production correction completes, returns to normal state by divide ratio, and the resistance of in removing step (2), spi bus being connected, thus the meter constant of ammeter is returned to original numerical value.
The aforesaid quick correction method based on adjustment meter constant, is characterized in that: the value of described N is between 2-4.
The aforesaid quick correction method based on adjustment meter constant, it is characterized in that: step (1), by adjustment divide ratio, the meter constant of ammeter being adjusted to original N method doubly is in process of production that in short circuit ammeter, the pin of each frequency divider of computation chip realizes.
The aforesaid quick correction method based on adjustment meter constant, is characterized in that: step (2), in ammeter, be connected a resistance that spi bus connects between computation chip with MCU in ammeter, resistance is 10 ~ 100 Ω.
The aforesaid quick correction method based on adjustment meter constant, it is characterized in that: step (4), after production correction completes, method divide ratio being returned to normal state is, the pin disconnecting the short circuit of each frequency divider of computation chip in ammeter realizes.
The aforesaid quick correction method based on adjustment meter constant, it is characterized in that: step (2), in ammeter, be connected an electric capacity in parallel on spi bus between computation chip with MCU in ammeter, capacitance is 10pF.
The invention has the beneficial effects as follows: the quick correction method based on adjustment meter constant of the present invention, by adjustment divide ratio, the meter constant of ammeter is adjusted to original N doubly when producing, then shorten to 1/N second interval time of each pulse, and the interference eliminated on data-signal transmission spi bus or shake, after production correction completes, again divide ratio is returned to normal state, so just can significantly enhance productivity and reduce production cost, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the quick correction method based on adjustment meter constant of the present invention.
Fig. 2 is the circuit diagram of interference on elimination spi bus of the present invention or shake.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, quick correction method based on adjustment meter constant of the present invention, by adjustment divide ratio, the meter constant of ammeter is adjusted to original N doubly when producing, then shorten to 1/N second interval time of each pulse, and the interference eliminated on data-signal transmission spi bus or shake, after production correction completes, again divide ratio is returned to normal state, so just can significantly enhance productivity and reduce production cost, specifically comprise the following steps
Step (1), by adjustment divide ratio, the meter constant of ammeter is adjusted to original N doubly in process of production, make to shorten to original 1/N two adjacent interpulse periods doubly, N is Clock Multiplier Factor, such as, ammeter inside is adjusted to 16 frequency divisions from 64 frequency divisions, be equivalent to when equal input, electrical energy pulse frequency expands 4 times, the meter constant of correction platform is also expanded 4 times simultaneously simultaneously, realized by the pin of each frequency divider of computation chip in short circuit ammeter, in order to reduce the saltus step of ammeter error, Clock Multiplier Factor N can not arrange too large, value 2-4 is proper, error amount before and after frequency multiplication changes <0.01%, substantially negligible, and, the divider ratio of the high-frequency impulse originally in ammeter requires to be divided exactly by N, the error change that pulse mantissa brings can be avoided like this
Step (2), a resistance that spi bus connects is connected between computation chip with MCU in ammeter in ammeter, stray capacitance on resistance and computation chip, form low-pass filter, eliminate the interference on spi bus or shake, resistance is 10 ~ 100 Ω, an electric capacity in parallel on spi bus can also be connected between computation chip with MCU in ammeter in ammeter, capacitance is 10pF, improve filter effect, circuit diagram, as shown in Figure 2, here for the selection of resistance, capacitance, to carry out according to the signal of the speed of spi bus and outside MCU;
Step (3), by software mode to ammeter calibration, reaches the requirement of table meter error;
Step (4), after production correction completes, the pin disconnecting the short circuit of each frequency divider of computation chip in ammeter realizes, divide ratio is returned to normal state, and the resistance of in removing step (2), spi bus being connected, if spi bus is parallel with electric capacity, also electric capacity is removed, thus 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, if specification is 3 × 57.7/100V, the three-phase and four-line intelligent electric meter of 1.5 (6) A, normal meter constant is 20000imp/kwh, if undertaken correcting and inspection table by 20000imp/kwh constant in production checking procedure, every platform ammeter needs 30 minutes substantially, if but by adjustment divide ratio, the constant of intelligent electric meter is amplified 4 times, so to debug and time of inspection table just can shorten to original 1/4, namely correct, inspection table time shorten is arrived 8 minutes, again divide ratio is returned to original state after having produced, so just can significantly enhance productivity and reduce production cost.
In sum, quick correction method based on adjustment meter constant of the present invention, by adjustment divide ratio, the meter constant of ammeter is adjusted to original N doubly when producing, then shorten to 1/N second interval time of each pulse, and the interference eliminated on data-signal transmission spi bus or shake, after production correction completes, again divide ratio is returned to normal state, so just can significantly enhance productivity and reduce production cost, have a good application prospect.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (6)
1., based on a quick correction method for adjustment meter constant, it is characterized in that: comprise the following steps,
Step (1), adjusts to original N doubly by adjustment divide ratio the meter constant of ammeter in process of production, makes to shorten to original 1/N two adjacent interpulse periods doubly;
Step (2), is connected a resistance that spi bus connects in ammeter between computation chip with MCU in ammeter, the stray capacitance on resistance and computation chip, forms low-pass filter, eliminate the interference on spi bus or shake;
Step (3), by software mode to ammeter calibration, reaches the requirement of table meter error;
Step (4), after production correction completes, returns to normal state by divide ratio, and the resistance of in removing step (2), spi bus being connected, thus the meter constant of ammeter is returned to original numerical value.
2. the quick correction method based on adjustment meter constant according to claim 1, is characterized in that: the value of described N is between 2-4.
3. the quick correction method based on adjustment meter constant according to claim 1, it is characterized in that: step (1), by adjustment divide ratio, the meter constant of ammeter being adjusted to original N method doubly is in process of production that in short circuit ammeter, the pin of each frequency divider of computation chip realizes.
4. the quick correction method based on adjustment meter constant according to claim 1, is characterized in that: step (2), and in ammeter, be connected a resistance that spi bus connects between computation chip with MCU in ammeter, resistance is 10 ~ 100 Ω.
5. the quick correction method based on adjustment meter constant according to claim 1, it is characterized in that: step (4), after production correction completes, method divide ratio being returned to normal state is, the pin disconnecting the short circuit of each frequency divider of computation chip in ammeter realizes.
6. the quick correction method based on adjustment meter constant according to claim 1, it is characterized in that: step (2), in ammeter, be connected an electric capacity in parallel on spi bus between computation chip with MCU in ammeter, capacitance is 10pF.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109884573A (en) * | 2019-03-13 | 2019-06-14 | 宁波三星医疗电气股份有限公司 | A kind of method of inspection of electric energy meter |
| CN110763890A (en) * | 2019-09-29 | 2020-02-07 | 许昌许继软件技术有限公司 | Metering device |
| CN112748271A (en) * | 2020-12-01 | 2021-05-04 | 宁波三星医疗电气股份有限公司 | Electric energy meter and electric quantity metering method thereof |
| CN113433509A (en) * | 2021-07-02 | 2021-09-24 | 威胜集团有限公司 | Calibration method of metering ammeter, electric energy meter and storage medium |
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| 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 |
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| CN112748271A (en) * | 2020-12-01 | 2021-05-04 | 宁波三星医疗电气股份有限公司 | Electric energy meter and electric quantity metering method thereof |
| CN113433509A (en) * | 2021-07-02 | 2021-09-24 | 威胜集团有限公司 | Calibration method of metering ammeter, electric energy meter and storage medium |
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