CN112285627B - Method for improving measurement accuracy of large-current direct-current ammeter - Google Patents
Method for improving measurement accuracy of large-current direct-current ammeter Download PDFInfo
- Publication number
- CN112285627B CN112285627B CN202011003238.1A CN202011003238A CN112285627B CN 112285627 B CN112285627 B CN 112285627B CN 202011003238 A CN202011003238 A CN 202011003238A CN 112285627 B CN112285627 B CN 112285627B
- Authority
- CN
- China
- Prior art keywords
- ammeter
- current
- data
- calibration
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention discloses a method for improving the measurement accuracy of a high-current direct-current ammeter, which comprises the following steps: calibrating parameters of data collected by a large-current direct-current ammeter; verifying the calibration result, and starting a corresponding repair mechanism according to the verification result; setting a threshold range, and removing the ammeter with the sampling error larger than the threshold range; the invention increases the current small signal compensation calibration; calibrating noise bias aiming at three paths of voltage and one path of current channel; the method has the advantages that small current, small voltage and small power are compensated, so that the metering range is enlarged, and in the meter calibration process, a meter calibration range limiting method is added, so that large errors caused by poor manganin or errors on a hardware circuit can be effectively eliminated, and the accuracy of data measurement is improved; the information data are encrypted by utilizing the communication link, so that the data transmitted to the server by the communication module are prevented from being intercepted and falsified by people, and the accuracy of the measured data is effectively improved.
Description
Technical Field
The invention relates to the technical field of direct current meter equipment, in particular to a method for improving the measurement accuracy of a large-current direct current meter.
Background
A dc ammeter is a meter used to measure the current intensity in a dc circuit. Because the traditional ammeter adopts a magnetoelectric system measuring mechanism, the allowed current is very small, about a few microamperes to hundreds of microamperes; in practical application, a shunt resistor needs to be additionally connected, so that the maximum measuring current and the precision of the direct current ammeter are mutually restricted; if the maximum measurement current is increased, the measurement accuracy in a low-current state is sacrificed, and even the low current cannot be measured; the problem of narrow range can be solved through the current direct measurement technology, but under the wide range state, the accuracy that the electric current was gathered just can be guaranteed to the ampere meter need carry out the timing of refining.
For example, chinese patent publication No. CN110763910A, published 2020, 02/07, entitled digital display dc meter and current sampling circuit thereof, includes a current sampling circuit including a reference signal module, a circuit protection module, and a hall current collecting circuit, a voltage dividing filter module, an emitter follower circuit, and a current collecting filter module, which are connected in series in sequence; the input end of the Hall current acquisition circuit is connected with the detected current, the input end of the reference signal module is connected with the Hall current acquisition circuit, the circuit protection module is connected with the Hall current acquisition circuit and the common end of the voltage division filtering module, and the output end of the current acquisition filtering module and the output end of the reference signal module are both connected with the processor of the digital display DC meter. The direct current meter calibration mode of the application is inaccurate, so that the measuring range of the direct current meter is inaccurate, and accurate information cannot be provided.
Disclosure of Invention
The invention mainly solves the problem of low measurement accuracy of a high-current DC ammeter in the prior art; the method for improving the measurement accuracy of the large-current direct-current ammeter is high in calibration accuracy and improves the measurement accuracy of the large-current direct-current ammeter.
The technical problem of the invention is mainly solved by the following technical scheme: a method for improving the measurement accuracy of a high-current direct-current ammeter comprises the following steps: calibrating parameters of data collected by a large-current direct-current ammeter; verifying the calibration result, and starting a corresponding repair mechanism according to the verification result; and setting a threshold range, and removing the ammeter with the sampling error larger than the threshold range. Different from other measurement chip SOC calibration methods, the calibration parameters of the measurement chip SOC calibration methods directly act on an internal register of a chip, and if the value in the register of the chip is abnormal, the value cannot be recovered, so that the field measurement error is abnormal; the method comprises the steps that meter calibration parameters are stored in a nonvolatile memory, three sets of meter calibration parameters are set, one set is the current meter calibration parameter, the other set is a backup meter calibration parameter, and the other set is a default meter calibration parameter; the repair mechanism is as follows: when the current meter calibrating parameter is abnormal, the backup meter calibrating parameter is used, and when the backup meter calibrating parameter is abnormal, the default meter calibrating parameter is used, so that the error of field measurement is reduced.
Preferably, the parameter calibration of the data collected by the large-current direct-current ammeter comprises the following steps:
s11: voltage measurement loop DC offset and noise compensation;
s12: current measurement loop DC offset and noise compensation;
s13: carrying out current and voltage gain calibration;
s14: performing active power gain calibration;
s15: performing compensation calibration on the small signal;
s16: and calibrating the load cathode channel end V- ', performing direct current compensation calibration on the load cathode channel end V- ', grounding the load cathode channel end V- ' to obtain a direct current instantaneous value which is a compensation value, and storing the compensation value.
Preferably, the step S11 includes the following steps:
s111: performing direct current compensation calibration on the charging pile signal channel end V +, grounding the charging pile signal channel end V +, taking a direct current instantaneous value as a compensation value, and storing the compensation value;
s112: carrying out direct current compensation calibration on the load anode channel end V + ', inputting the load anode channel end V +', grounding, and storing a compensation value, wherein a direct current instantaneous value is the compensation value;
s113: performing effective value secondary noise compensation on a charging pile signal channel end V + channel, grounding the charging pile signal channel end V +, taking the square accumulated data as a compensation value, and storing the compensation value;
s114: and carrying out effective value secondary noise compensation on the load anode channel end V + 'channel, inputting the load anode channel end V +' to the ground, taking the square accumulated data as a compensation value, and storing the compensation value.
Preferably, the step S12 includes the following steps:
s121: performing direct current compensation calibration on the loop current signal I, inputting the loop current signal I to the ground, taking a direct current instantaneous value as a compensation value, and storing the compensation value;
s122: and performing effective value secondary noise compensation on the loop current signal I, inputting the loop current signal I to the ground, taking the square accumulated data as a compensation value, and storing the compensation value.
Preferably, the calculation formula of the current-voltage gain calibration is as follows:
vgain1 is the voltage gain factor, m0 is the standard table body standard value, Vgain1 ' is the old voltage V- ' gain factor, and V ' is the voltage value measured by the electric meter. The calibration process is as follows: and loading the voltage f1 of V + and V + 'and the current t1 on the calibration device, inputting the actual voltage and current values to calibration software, and updating the voltage gain coefficients Vgain of the V + channel and the V +' channel and the current gain coefficient Igain of the I channel in a table. The effective values of the three metering channels of V +, V +', and I are mainly calibrated.
Preferably, step S15 includes the steps of:
s151: and (3) current small signal compensation calibration: the current small signal calibration formula is as follows: ioffset ═ m 2-I';
ioffset is a small current compensation coefficient, m2 is a standard platform body standard value, and I' is a current value measured by the ammeter; the current small signal calibration method comprises the following steps: loading reference voltage V +, V +', Un ═ f3 and reference current 5% Ib ═ t3 on a calibration device, inputting the actual current value of the standard platform body to calibration software, inputting the standard value to a table, and updating a small current compensation coefficient Ioffset in the table;
s152: and (3) voltage small signal compensation calibration: the voltage small signal calibration formula is as follows: voffset equals m 2-V'.
Voffset is a small voltage compensation coefficient, m2 is a standard value of the standard platform body, and I' is a voltage value measured by the ammeter;
the voltage small signal calibration method comprises the following steps: loading a reference voltage V +, V +', Un ═ f5 and a reference current 5% Ib ═ t5 on a calibration device, inputting an actual voltage value of a standard table body to calibration software, inputting the standard value to a table, and updating a small voltage compensation coefficient Voffset in the table;
s153: and (3) power small signal compensation calibration: the power small signal calibration formula is as follows: poffset ═ m3-P ";
poffset is a power small signal compensation coefficient, m3 is a standard platform body standard value, and P' is a power value measured by an ammeter;
the power small signal calibration method comprises the following steps: loading a reference voltage V +, V +', Un ═ f4 and a reference current 5% Ib ═ t4 on a calibration device, inputting the actual current value of the standard table body to calibration software, inputting the standard value to a table, and updating a small current compensation coefficient Poffset in the table. After the rated current is calibrated, the error of the small current is needed to be observed, and the error of the small current is usually larger at this time; in order to ensure that the small current measurement is more accurate, the invention adds the compensation and calibration of the small current signal; the calibration parameters are numerous, and the related range is wide; calibrating noise bias aiming at three paths of voltage and one path of current channel; the small current, the small voltage and the small power are compensated, so that the metering range is enlarged.
Preferably, the method further comprises the following steps: numbering and marking the ammeter with effective sampling, and establishing a local communication link; the ammeters in the local communication link are communicated with each other, and each ammeter is connected with the server; the method for establishing the local communication link comprises the following steps: the method comprises the steps of carrying out proportional mapping on longitude and latitude information of an installation position of an effectively sampled ammeter to form a two-dimensional graph, carrying out two-dimensional graph segmentation on rectangles in a unit area to form a plurality of local communication links, defining the ammeter as theta if the ammeter is located on a boundary line or an end point of the unit rectangle, drawing a circle by taking the ammeter theta as a circle center and taking an average value of lengths from the ammeter theta to the nearest ammeter in each adjacent rectangle as a radius, forming a communication link between the ammeter theta and a rectangular area with the shortest distance length of the ammeter in the rectangular area if the number of the ammeters at the overlapped part of the circle and each rectangle is less than or equal to one, and forming a communication link between the ammeter theta and the rectangular area with the largest number of the ammeters at the overlapped part if the number of the ammeters at the overlapped part of the circle and one rectangle is greater than one. After an invalid ammeter is eliminated, communication link planning is carried out on the effectively sampled ammeter, a local communication link is formed, communication cost is reduced, and the sampled effective data are transmitted to a server.
Preferably, after the data sampling is completed by the ammeter in the communication link, data exchange is randomly performed from a certain ammeter, and the method for performing data exchange comprises the following steps: the method comprises the steps that a first ammeter splits a data packet into a part and randomly transmits the number of the first ammeter to a second ammeter, the second ammeter receives the data packet of the first ammeter and then replaces the data packet according to the probability of 1/2, if the data packet is replaced, a flag bit 1 is generated, if the data packet is not replaced, a flag bit 0 is generated, the number of the data packet, the number of the first ammeter and the number of the first ammeter are transmitted to a next ammeter, until the last ammeter and the first ammeter form a communication link cycle, data exchange information and data transmission sequence information of each ammeter are received in the first ammeter, each ammeter transmits the data packet to a server, and the server performs data packet restoration according to the information of the first ammeter. The data adopted by the ammeter is encrypted, so that the data transmitted to the server by the communication module is prevented from being intercepted and falsified by a person, and the accuracy of the measured data is effectively improved.
Preferably, the high-current dc current meter includes: casing, connecting seat, base plate, communication module, storage module, current measurement unit, voltage measurement unit, data interface, two wiring boards, fin, sampling resistor and controller, base plate and communication module all install in the casing, communication module, storage module, current measurement unit, voltage measurement unit and controller are all installed on the base plate, data interface installs on the casing, the connecting seat is connected with the casing side, two the wiring board is all installed on the connecting seat, sampling resistor connects two between the wiring board, current measurement unit measures the partial pressure at sampling resistor both ends, voltage measurement unit one end is connected with the wiring board, and voltage measurement unit other end ground connection, the fin is installed on the wiring board, current measurement unit, voltage measurement unit, communication module, current measurement unit, voltage measurement unit, data interface, The storage module and the data interface are connected with the controller. The current flowing through the sampling resistor can be obtained by measuring the partial pressure at the two ends of the sampling resistor, the voltage at the position of the sampling resistor can be measured by the voltage measuring unit, and the measurement result can be sent to the server through the communication module to finish data uploading.
Preferably, the controller comprises a functional chip and a metering chip, the functional chip and the metering chip are both installed on the substrate, the metering chip is connected with the current measuring unit, the voltage measuring unit, the memory and the functional chip, and the functional chip is connected with the communication module, the memory module and the data interface. The functional chip can complete the function tasks of data reporting, data query, manual field debugging, data setting and the like, rich services are provided, metering and use of the ammeter are facilitated, the metering chip only executes the metering tasks according to a preset program, and the metering results are periodically stored in the memory and sent to the functional chip, so that the metering chip can accurately and timely process the data collected by the current measuring unit and the voltage measuring unit.
The invention has the beneficial effects that: (1) after the rated current is calibrated, the error of the small current is needed to be observed, and the error of the small current is usually larger at this time; in order to ensure that the small current measurement is more accurate, the invention adds the compensation calibration of the small current signal according to the requirement; the calibration parameters are numerous, and the related range is wide; calibrating noise bias aiming at three paths of voltage and one path of current channel; small current, small voltage and small power are compensated, so that the metering range is expanded; (2) in the process of checking the meter, a method for limiting the range of the meter checking is added, so that the large errors caused by the errors on poor manganin or hardware circuits can be effectively eliminated, the qualification rate of products is improved, and the efficiency of problem troubleshooting is improved; (3) the information data are encrypted by utilizing the communication link, so that the data transmitted to the server by the communication module are prevented from being intercepted and falsified by people, and the accuracy of the measured data is effectively improved.
Drawings
FIG. 1 is a diagram illustrating an ammeter according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an ammeter wiring board mounting position according to an embodiment.
In the figure: 1. the device comprises a key, 2, a liquid crystal screen, 3, a flip cover, 4, a cover plate, 5, a sampling resistor guard plate, 6, a guide rail, 7, a shell, 8, a communication interface, 9, a wiring board, 10, a radiating fin, 11 and a connecting seat.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows: a method for improving the measurement accuracy of a high-current dc ammeter, as shown in fig. 1 and 2, the high-current dc ammeter comprising: a shell 7, a connecting seat 11, a base plate, a communication module, a memory module, a current measuring unit, a voltage measuring unit, a data interface, two wiring boards 9, a heat radiating fin 10, a sampling resistor and a controller, the base plate and the communication module are installed in the shell 7, the communication module, the storage module, the current measuring unit, the voltage measuring unit and the controller are installed on the base plate, the data interface is installed on the shell 7, the connecting seat 11 is connected with the side face of the shell 7, the two wiring boards 9 are installed on the connecting seat 11, the sampling resistor is connected between the two wiring boards 9, the current measuring unit measures the partial pressure at two ends of the sampling resistor, one end of the voltage measuring unit is connected with the wiring boards 9, the other end of the voltage measuring unit is grounded, the radiating fins 10 are installed on the wiring boards 9, the current measuring unit, the voltage measuring unit, the communication module, the storage module and the data interface are connected with the controller. Sampling resistance backplate 5 passes through the buckle with connecting seat 11 and is connected, and sampling resistance backplate 5 cladding sampling resistance. The cover plate 4 is clamped with the connecting seat 11, the cover plate 4 covers the radiating fins 10, gaps are formed between the cover plate 4 and the radiating fins 10, the height of the cover plate 4 is equivalent to that of the protruding portion of the shell 7, and openings for accommodating connecting wires of the wiring board 9 are formed in two sides of the cover plate 4. The guide rail 6 groove is arranged at the bottom of the shell 7 and is used for being clamped with the guide rail 6.
The data interface includes a plurality of 485 communication interface 8, and a plurality of 485 communication interface 8 installs at the basal portion outer wall and is located protruding portion one side, and the calibration wiring mouth is installed at the basal portion outer wall and is located the protruding portion opposite side, and the calibration wiring mouth is connected with current measurement unit, voltage measurement unit and controller. The communication module has the advantage of high communication speed, the 485 external communication speed can reach 921600bps at the fastest speed, and the 485 communication module can complete data transmission or program upgrading tasks. The base of the shell 7 is provided with a protrusion for rotationally connecting the flip 3, and the flip 3 covers the 485 communication interface 8 and the calibration wiring port. LCD screen 2 and button 1 all install on casing 7, and LCD screen 2 is connected with dot matrix liquid crystal driver, and dot matrix liquid crystal driver and button 1 all are connected with the controller.
The controller comprises a functional chip and a metering chip, wherein the functional chip and the metering chip are both arranged on the substrate, the metering chip is connected with the current measuring unit, the voltage measuring unit, the memory and the functional chip, and the functional chip is connected with the communication module, the storage module and the data interface.
The method for improving the measurement accuracy of the large-current direct-current ammeter comprises the following steps: calibrating parameters of data collected by a large-current direct-current ammeter; verifying the calibration result, and starting a corresponding repair mechanism according to the verification result; setting a threshold range, and removing the ammeter with the sampling error larger than the threshold range; numbering and marking the ammeter with effective sampling, and establishing a local communication link; the ammeters within the local communication link communicate with each other and each ammeter is connected to the server.
Different from other measurement chip SOC calibration methods, the calibration parameters of the measurement chips directly act on an internal register of the chip, and if the value in the register of the chip is abnormal, the calibration parameters cannot be recovered, so that the field measurement error is abnormal; the method comprises the steps that meter calibration parameters are stored in a nonvolatile memory, three sets of meter calibration parameters are set, one set is the current meter calibration parameter, the other set is a backup meter calibration parameter, and the other set is a default meter calibration parameter; the repair mechanism is as follows: when the current meter calibrating parameters are abnormal, the backup meter calibrating parameters are used, and when the backup meter calibrating parameters are abnormal, the default meter calibrating parameters are used, so that the error of field metering is reduced; in the process of checking the meter, a method for limiting the range of the meter checking is added, so that the large errors caused by errors on poor manganin or hardware circuits can be effectively eliminated, the qualification rate of products is improved, and the efficiency of problem troubleshooting is improved.
The parameter calibration of the data collected by the large-current direct-current ammeter comprises the following steps:
s11: voltage measurement loop DC offset and noise compensation;
s12: current measurement loop DC offset and noise compensation;
s13: carrying out current and voltage gain calibration;
s14: performing active power gain calibration;
s15: performing compensation calibration on the small signal;
s16: and calibrating the load cathode channel end V- ', performing direct current compensation calibration on the load cathode channel end V- ', grounding the load cathode channel end V- ' to obtain a direct current instantaneous value which is a compensation value, and storing the compensation value.
Step S11 includes the following steps:
s111: performing direct current compensation calibration on the charging pile signal channel end V +, grounding the charging pile signal channel end V +, taking a direct current instantaneous value as a compensation value, and storing the compensation value;
s112: carrying out direct current compensation calibration on the load anode channel end V + ', inputting the load anode channel end V +', grounding, and storing a compensation value, wherein a direct current instantaneous value is the compensation value;
s113: performing effective value secondary noise compensation on a charging pile signal channel end V + channel, grounding the charging pile signal channel end V +, taking the square accumulated data as a compensation value, and storing the compensation value;
s114: and carrying out effective value secondary noise compensation on the load anode channel end V + 'channel, inputting the load anode channel end V +' to the ground, taking the square accumulated data as a compensation value, and storing the compensation value.
Step S12 includes the following steps:
s121: performing direct current compensation calibration on the loop current signal I, inputting the loop current signal I to the ground, taking a direct current instantaneous value as a compensation value, and storing the compensation value;
s122: and performing effective value secondary noise compensation on the loop current signal I, inputting the loop current signal I to the ground, taking the square accumulated data as a compensation value, and storing the compensation value.
The calculation formula of the current-voltage gain calibration is as follows:
vgain1 is the voltage gain factor, m0 is the standard table body standard value, Vgain1 ' is the old voltage V- ' gain factor, and V ' is the voltage value measured by the electric meter. The calibration process is as follows: and loading the voltage f1 of V + and V + 'and the current t1 on the calibration device, inputting the actual voltage and current values to calibration software, and updating the voltage gain coefficients Vgain of the V + channel and the V +' channel and the current gain coefficient Igain of the I channel in a table. The effective values of the three metering channels of calibration V +, V +', I are mainly used.
Step S15 includes the following steps:
s151: and (3) current small signal compensation calibration: the current small signal calibration formula is as follows: ioffset ═ m 2-I';
ioffset is a small current compensation coefficient, m2 is a standard platform body standard value, and I' is a current value measured by the ammeter; the current small signal calibration method comprises the following steps: loading a reference voltage V +, V +', Un ═ f3 and a reference current 5% Ib ═ t3 on a calibration device, inputting the actual current value of the standard table body to calibration software, inputting the standard value to a table, and updating a small current compensation coefficient Ioffset in the table;
s152: and (3) voltage small signal compensation calibration: the voltage small signal calibration formula is as follows: voffset equals m 2-V'.
Voffset is a small voltage compensation coefficient, m2 is a standard value of the standard platform body, and I' is a voltage value measured by the ammeter;
the voltage small signal calibration method comprises the following steps: loading a reference voltage V +, V +', Un ═ f5 and a reference current 5% Ib ═ t5 on a calibration device, inputting an actual voltage value of a standard table body to calibration software, inputting the standard value to a table, and updating a small voltage compensation coefficient Voffset in the table;
s153: and (3) power small signal compensation calibration: the power small signal calibration formula is as follows: poffset ═ m3-P ";
poffset is a power small signal compensation coefficient, m3 is a standard platform body standard value, and P' is a power value measured by an ammeter;
the power small signal calibration method comprises the following steps: loading a reference voltage V +, V +', Un ═ f4 and a reference current 5% Ib ═ t4 on a calibration device, inputting the actual current value of the standard table body to calibration software, inputting the standard value to a table, and updating a small current compensation coefficient Poffset in the table. After the rated current is calibrated, the error of the small current is needed to be observed, and the error of the small current is usually larger at this time; in order to ensure that the small current measurement is more accurate, the invention adds the compensation and calibration of the small current signal; the calibration parameters are numerous, and the related range is wide; calibrating noise bias aiming at three paths of voltage and one path of current channel; the small current, the small voltage and the small power are compensated, so that the metering range is enlarged.
The method for establishing the local communication link comprises the following steps: carrying out proportional mapping on longitude and latitude information of an installation position of an effectively sampled ammeter to form a two-dimensional graph, carrying out two-dimensional graph segmentation by using rectangles in unit area to form a plurality of local communication links, defining the ammeter as theta if the ammeter is positioned at a boundary line or an end point of the unit rectangle, drawing a circle by using the ammeter theta as a circle center and using an average value of lengths from the ammeter theta to the nearest ammeter in each adjacent rectangle as a radius, forming a communication link by using the ammeter theta and a rectangular area with the shortest distance length from the ammeter in the rectangular area if the number of the ammeters at the overlapped part of the circle and each rectangle is less than or equal to one, forming a communication link by using the ammeter theta and the rectangular area with the largest number of the ammeters at the overlapped part if the number of the ammeters at the overlapped part of the circle and one rectangle is greater than one, and carrying out data exchange from one ammeter in the communication link at random after data sampling is completed, the method for data exchange comprises the following steps: the first ammeter splits a data packet into a part and randomly transmits the part and the number of the first ammeter to a second ammeter, the second ammeter receives the data packet of the first ammeter and then replaces the data packet with the probability of 1/2, if the data packet is replaced, a flag bit 1 is generated, if the data packet is not replaced, a flag bit 0 is generated, the data packet, the number of the first ammeter and the number of the first ammeter are transmitted to the next ammeter, until the last ammeter and the first ammeter form a communication link cycle, the first ammeter receives data exchange information and data transmission sequence information of each ammeter, each ammeter transmits the data packet to a server, the server performs data packet reduction according to the information of the first ammeter, performs information encryption on data adopted by the ammeter, and prevents the data transmitted to the server by a communication module from being intercepted and tampered by a person, the accuracy of the measured data is effectively improved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (3)
1. A method for improving the measurement accuracy of a large-current direct-current ammeter is characterized by comprising the following steps:
calibrating parameters of data collected by a large-current direct-current ammeter;
verifying the calibration result, and starting a corresponding repair mechanism according to the verification result;
setting a threshold range, and removing the ammeter with the sampling error larger than the threshold range;
numbering and marking the ammeter with effective sampling, and establishing a local communication link;
the ammeters in the local communication link are communicated with each other, and each ammeter is connected with the server;
the method for establishing the local communication link comprises the following steps: carrying out proportional mapping on longitude and latitude information of an installation position of an effectively sampled ammeter to form a two-dimensional graph, carrying out two-dimensional graph segmentation on rectangles in a unit area to form a plurality of local communication links, defining the ammeter as theta if the ammeter is positioned at a boundary line or an end point of the unit rectangle, drawing a circle by taking the ammeter theta as a circle center and taking an average value of lengths from the ammeter theta to the nearest ammeter in each adjacent rectangle as a radius, forming a communication link between the ammeter theta and a rectangular area with the shortest distance length of the ammeter in the rectangular area if the number of the ammeters at the overlapped part of the circle and each rectangle is less than or equal to one, and forming a communication link between the ammeter theta and the rectangular area with the largest number of the ammeters at the overlapped part if the number of the ammeters at the overlapped part of the circle and one rectangle is greater than one;
after the data sampling is completed by the ammeter in the communication link, data exchange is randomly carried out from a certain ammeter, and the method for carrying out the data exchange comprises the following steps: the method comprises the steps that a first ammeter splits a data packet into a part and randomly transmits the number of the first ammeter to a second ammeter, the second ammeter receives the data packet of the first ammeter and then replaces the data packet according to the probability of 1/2, if the data packet is replaced, a flag bit 1 is generated, if the data packet is not replaced, a flag bit 0 is generated, the number of the data packet, the number of the first ammeter and the number of the first ammeter are transmitted to a next ammeter, until the last ammeter and the first ammeter form a communication link cycle, data exchange information and data transmission sequence information of each ammeter are received in the first ammeter, each ammeter transmits the data packet to a server, and the server performs data packet restoration according to the information of the first ammeter.
2. The method for improving the measurement accuracy of the high-current DC ammeter according to claim 1,
the high-current DC ammeter comprises: casing, connecting seat, base plate, communication module, storage module, current measurement unit, voltage measurement unit, data interface, two wiring boards, fin, sampling resistor and controller, base plate and communication module all install in the casing, communication module, storage module, current measurement unit, voltage measurement unit and controller are all installed on the base plate, data interface installs on the casing, the connecting seat is connected with the casing side, two the wiring board is all installed on the connecting seat, sampling resistor connects two between the wiring board, current measurement unit measures the partial pressure at sampling resistor both ends, voltage measurement unit one end is connected with the wiring board, and voltage measurement unit other end ground connection, the fin is installed on the wiring board, current measurement unit, voltage measurement unit, communication module, current measurement unit, voltage measurement unit, data interface, The storage module and the data interface are connected with the controller.
3. The method for improving the measurement accuracy of the high-current DC ammeter according to claim 2,
the controller comprises a function chip and a metering chip, wherein the function chip and the metering chip are both installed on the substrate, the metering chip is connected with the current measuring unit, the voltage measuring unit, the memory and the function chip, and the function chip is connected with the communication module, the storage module and the data interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003238.1A CN112285627B (en) | 2020-09-22 | 2020-09-22 | Method for improving measurement accuracy of large-current direct-current ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003238.1A CN112285627B (en) | 2020-09-22 | 2020-09-22 | Method for improving measurement accuracy of large-current direct-current ammeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112285627A CN112285627A (en) | 2021-01-29 |
| CN112285627B true CN112285627B (en) | 2022-06-17 |
Family
ID=74421940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011003238.1A Active CN112285627B (en) | 2020-09-22 | 2020-09-22 | Method for improving measurement accuracy of large-current direct-current ammeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112285627B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207218721U (en) * | 2017-08-01 | 2018-04-10 | 陈培安 | A kind of interactive powerline network simulator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258716C (en) * | 2003-11-26 | 2006-06-07 | 中国人民解放军国防科学技术大学 | Double ring method for monitoring partial cache consistency of on-chip multiprocessors |
| US9208506B2 (en) * | 2014-03-17 | 2015-12-08 | Bleachr Llc | Geofenced event-based fan networking: methods |
| CN103916942B (en) * | 2014-04-04 | 2017-04-12 | 安徽工程大学 | LEACH protocol improvement method capable of lowering energy consumption |
| CN111638481A (en) * | 2020-06-12 | 2020-09-08 | 浙江瑞银电子有限公司 | Large-current direct current ammeter and calibration method thereof |
-
2020
- 2020-09-22 CN CN202011003238.1A patent/CN112285627B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207218721U (en) * | 2017-08-01 | 2018-04-10 | 陈培安 | A kind of interactive powerline network simulator |
Non-Patent Citations (1)
| Title |
|---|
| 基于粒子均衡的移动传感器网络覆盖控制研究;张洪德 等;《仪器仪表学报》;20160531;第37卷(第5期);第1049-1057页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112285627A (en) | 2021-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103675647B (en) | A kind of calibrating installation based on integrated circuit standard print and method | |
| US7511508B2 (en) | Fixture characteristic measuring device, method, program, recording medium, network analyzer, and semiconductor test device | |
| CN104297713B (en) | Integrated circuit test system load plate calibration system | |
| CN109633255A (en) | Current measuring device and current measuring method based on current divider | |
| CN103278693A (en) | Probe contact resistance measuring method | |
| CN105911507A (en) | Electric energy meter function test device | |
| CN112285627B (en) | Method for improving measurement accuracy of large-current direct-current ammeter | |
| CN111239673B (en) | System and method for detecting residual current metering precision of electric energy meter | |
| CN111638481A (en) | Large-current direct current ammeter and calibration method thereof | |
| CN106908750A (en) | A kind of electric energy meter pulse error detection method and device | |
| CN106707213B (en) | A kind of digital integrated electronic circuit standard sample of photo | |
| CN107703360A (en) | A kind of impedance test system and method for server complete signal link | |
| CN113884966B (en) | AC/DC sensor broadband calibrator and performance detection calibration method thereof | |
| CN115856750A (en) | Device and method for quickly calibrating SOC (System on chip) test system | |
| CN102998646A (en) | Quick calibrating device of semiconductor direct current parameter measurement module group | |
| CN109407140A (en) | A kind of multichannel photomultiplier tube levelling device that pet detector uses | |
| CN113030675B (en) | Non-back-gold MOSFET wafer testing method based on near particle method | |
| CN111766554A (en) | Direct current ammeter with wide metering range | |
| KR102353999B1 (en) | Apparatus and method for detecting current transformer ratio error | |
| CN115290951A (en) | High-voltage-resistance current detection splitter for new energy automobile battery management system | |
| CN104852776B (en) | A kind of radiofrequency signal calibration method based on tunnel | |
| CN207730927U (en) | T/R component test system calibrating installations | |
| Yang et al. | Characterization and Modeling of Zener Diode Breakdown Voltage Mismatch | |
| CN110470931B (en) | Method for measuring radiation sensitive parameters of operational amplifier | |
| CN214011339U (en) | Large-current wide-range direct current ammeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |