CN105425197A - DC energy meter calibration method and system - Google Patents
DC energy meter calibration method and system Download PDFInfo
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- CN105425197A CN105425197A CN201510762979.0A CN201510762979A CN105425197A CN 105425197 A CN105425197 A CN 105425197A CN 201510762979 A CN201510762979 A CN 201510762979A CN 105425197 A CN105425197 A CN 105425197A
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Abstract
The present invention relates to a DC energy meter calibration method. The method comprises a step of calibrating a DC offset value and a step of calibrating a gain and also comprises a step of calculating a voltage gain according to a first voltage value, a voltage original value and a second voltage value and calculating a current gain according to a first current value, a current original value and a second current value, and a step of sending a DC voltage offset value, a current offset value, the voltage gain and the current gain to a DC energy meter to complete the calibration of the DC energy meter. The DC energy meter calibration method has the advantages of high calibration precision and short calibration time. The invention also relates to a DC energy meter calibration system.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of DC ammeter correction method, also relate to a kind of direct current energy meter meter correcting system.
Background technology
Direct current energy meter needs accurately to measure the real-time variables such as voltage, electric current and power in real time, and correctly can add up electric flux.Generally that DC offset (DCoffset) to voltage and current and gain (Gain) are calibrated to the calibration process of direct current energy meter.Wherein, DC offset represents the offset calibration amount of DC noise in the metering module of direct current energy meter; Gain then represents the conversion multiple of simulating signal.
Correction method many employings empirical approximations method of traditional direct current energy meter.The empirical approximations method DC offset that normally artificially estimation one is possible and gain, directly write in the register of the metering module of direct current energy meter.Then the source of rising checks that whether the measured value of direct current energy meter is consistent with the output valve of electric current and voltage source device.If have deviation again toward deviation correspondence direction amendment DC offset and gain.Above operation repeatedly, until the measured value of direct current energy meter close to or equal the output valve of electric current and voltage source device.This calibration steps needs a large amount of experimental datas to estimate a possible DC offset and gain, and needs operator to have certain experience can to carry out.Further, calibration result also can only reach close to mode, and cannot determination result have accuracy very and expend time in longer theoretically.
Summary of the invention
Based on this, be necessary to provide a kind of calibration accuracy higher and calibrate the shorter direct current energy meter correction method of duration.
A kind of direct current energy meter correction method, comprises the step of calibrating DC offset and the step of calibrating gain; Described step of calibrating DC offset comprises the voltage input end of direct current energy meter and current input terminal short circuit in analog, control described direct current energy meter work, the first magnitude of voltage that the measurement of record direct current energy meter obtains and the first current value, and described first magnitude of voltage is designated as DC voltage offset amount and described first current value is designated as direct current offset amount, disconnect the short circuit at described voltage input end and described current input terminal place; Described step of calibrating gain comprises the output of DC source is promoted to calibration point, control direct current energy meter to measure described DC source, record direct current energy meter carries out the voltage original value before Analog-digital Converter and electric current original value, the second magnitude of voltage that the measurement of record direct current energy meter obtains and the second current value; Described method also comprises step: according to described first magnitude of voltage, voltage original value and described second magnitude of voltage calculating voltage gain, and according to described first current value, electric current original value and described second current value calculating current gain; And described DC voltage offset amount, described direct current offset amount, described voltage gain and described current gain to be sent to described direct current energy meter to complete calibration to described direct current energy meter.
Wherein in an embodiment, described by the voltage input end of direct current energy meter and current input terminal short circuit in step in analog, current input terminal comprises positive current input end and negative current input end.
Wherein in an embodiment, short circuit adopts Zero-ohm resistor wire to carry out short circuit.
Wherein in an embodiment, the step of the first magnitude of voltage that the measurement of described record direct current energy meter obtains and the first current value is specially: record the first magnitude of voltage and the first current value that direct current energy meter measurement obtains after waiting for the metering module working stability of described direct current energy meter again.
Wherein in an embodiment, the described output by DC source is promoted in the step of calibration point, and the voltage of described calibration point is make the voltage of the measuring voltage value of described direct current energy meter in 30% ~ 70% scope of the voltage range of described direct current energy meter; The electric current of described calibration point is make the electric current of the measurement current value of described direct current energy meter in 30% ~ 70% scope of the current range of described direct current energy meter.
Wherein in an embodiment, after the step that described control direct current energy meter is measured described DC source, describedly record before described direct current energy meter carries out the step of the voltage original value before Analog-digital Converter and electric current original value, also comprise and initialized step is carried out to the metering module of described direct current energy meter.
Wherein in an embodiment, the step of the voltage original value before described record direct current energy meter carries out Analog-digital Converter and electric current original value needs just to carry out record after the output of described DC source is in steady state (SS); The step of the second magnitude of voltage that the measurement of described record direct current energy meter obtains and the second current value needs to stablize laggard line item at the metering module of described direct current energy meter.
A kind of direct current energy meter meter correcting system is also provided.
A kind of direct current energy meter meter correcting system, comprises the first frock for calibrating DC offset, for second frock of calibrating DC offset and main control unit; Described first frock, comprises short-circuit device and first control device; Described short-circuit device is used for the voltage input end of direct current energy meter and current input terminal short circuit in analog; Described first control device is measured for controlling described direct current energy meter, the first magnitude of voltage that record direct current energy meter measurements obtains and the first current value, and described first magnitude of voltage is designated as DC voltage offset amount and controls the disconnection of described short-circuit device after described first current value is designated as direct current offset amount; Described second frock, comprises DC source and second control device; Described second control device respectively with described DC source, described direct current energy list catenation; The output of described DC source is promoted to calibration point for controlling by described second control device; Described second control device is also measured described DC source for controlling described direct current energy meter after the output of DC source is promoted to calibration point, and record described direct current energy meter carry out Analog-digital Converter before Initial Voltage Value and the second magnitude of voltage of obtaining of voltage original value and described direct current energy meter measurement and the second current value; Described main control unit is used for according to described first magnitude of voltage, voltage original value and described second magnitude of voltage calculating voltage gain, and according to described first current value, electric current original value and described second current value calculating current gain; Described main control unit is also for sending to described direct current energy meter to complete calibration to described direct current energy meter by described DC voltage offset amount, described direct current offset amount, described voltage gain and described current gain.
Wherein in an embodiment, described first control device and described second control device carry out independent control respectively by described main control unit.
Wherein in an embodiment, described direct current energy meter comprises printed circuit board (PCB); Described printed circuit board (PCB) is provided with current sampling circuit and voltage sampling circuit; Described printed circuit board (PCB) is also provided with for the short circuit point carrying out short circuit in analog; Described short circuit point is arranged at the voltage input end of described voltage sampling circuit and the current input terminal of described current sampling circuit and arranges in analog near described; Short-circuit device in described first frock is used for described short circuit point short circuit in analog described.
In above-mentioned direct current energy meter correction method and system, when calibrating DC offset, voltage input end, current input terminal short circuit in method in analog, are improve the sampling precision of the sampled signal of direct current energy meter, and then improve calibration accuracy by employing.And, two independently steps are calibrated to DC offset and gain in calibration process, therebetween interference is less and only need once to rise source operation (output of DC source is promoted to calibration point), saves the alignment time greatly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the current sampling circuit of direct current energy meter in an embodiment;
Fig. 2 is the circuit theory diagrams of the voltage sampling circuit of direct current energy meter in an embodiment;
Fig. 3 is the theory diagram of the analog-to-digital conversion circuit of direct current energy meter in an embodiment;
Fig. 4 is each short circuit point of direct current energy meter in an embodiment and the schematic diagram carrying out short circuit in analog;
Fig. 5 is the process flow diagram of the direct current energy meter correction method in an embodiment;
Fig. 6 is the particular flow sheet of the step S110 shown in Fig. 5;
Fig. 7 is the particular flow sheet of the step S120 shown in Fig. 5;
Fig. 8 is the structured flowchart of the direct current energy meter meter correcting system in an embodiment;
Fig. 9 be shown in Fig. 8 in the schematic diagram of the first frock;
Figure 10 be shown in Fig. 8 in the schematic diagram of the second frock.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Direct current energy meter is as the survey instrument of the real-time variables such as voltage, electric current and power, and its measurement data needs to have higher precision.Therefore, the invention provides a kind of direct current energy meter, be conducive to improving the precision in calibration process, thus guarantee that the direct current energy meter after calibrating has higher measurement precision.Direct current energy meter in one embodiment, it comprises printed circuit board (PCB).Printed circuit board (PCB) is provided with control circuit.Control circuit comprises voltage sampling circuit, current sampling circuit and analog-to-digital conversion circuit.Wherein, voltage sampling circuit and current sampling circuit are respectively used to sample to the voltage and current of DC source to be measured, and sampled voltage, sample rate current are exported to analog digital (AD) change-over circuit and processed.Fig. 1 is the circuit theory diagrams of the current sampling circuit of direct current energy meter in the present embodiment, and Fig. 2 is the circuit theory diagrams of the voltage sampling circuit in the present embodiment, and Fig. 3 is then the circuit theory diagrams of analog-to-digital conversion circuit.
In the present embodiment, printed circuit board (PCB) is also provided with for the short circuit point carrying out short circuit in analog.Short circuit point is arranged at the voltage input end of voltage sampling circuit and the current input terminal of current sampling circuit and near concentrated setting in analog.Particularly, short circuit point comprises the short circuit point J2 of the positive current input end I+1 laying respectively at current sampling circuit, the short circuit point J1 of negative current input end I-1 and is positioned at short circuit point J3 (see Fig. 1 and Fig. 2) of voltage input end of voltage sampling circuit.Short circuit point can by Zero-ohm resistor wire short circuit in analog.In the present embodiment, short circuit point can for being arranged at the pad on printed circuit board (PCB).By close for short circuit point concentrated setting in analog, the length of the shorting stub in short circuit process can be shortened greatly.Fig. 4 is for carrying out the schematic diagram of short circuit by each short circuit point (J1, J2 and J3) with GVAD in analog by shorting stub 400.Direct current energy meter in the present embodiment passes through close for short circuit point (J1, J2 and J3) VGAD concentrated setting in analog, (shorting stub 400 is generally unsettled setting can to reduce the length of shorting stub 400, the electromagnetic interference (EMI) of the longer generation of its length is larger), thus the electromagnetic interference (EMI) that reduction shorting stub 400 brings, improve the sampling precision of sampled signal, and then be conducive to improving calibration accuracy.In another embodiment, each short circuit point also can sequentially pass through 4 pads (short circuit point (J1, J2 and J3) and in analog GVAD) by a straight wire and they be coupled together, and realizes short circuit point and the short circuit in analog between GVAD.
A kind of direct current energy meter correction method, for calibrating the direct current energy meter in aforementioned any embodiment.Fig. 5 is the process flow diagram of the direct current energy meter correction method in an embodiment, and the method comprises the following steps.
S110, calibrates DC offset.
In the present embodiment, the step of calibrate DC offset and the step of calibrating gain is separate carries out, interference is therebetween less.Particularly, adopt the first frock to calibrate DC offset, calibration process specifically comprises step S210 ~ S240, as shown in Figure 6.
S210, by the voltage input end of direct current energy meter and current input terminal short circuit in analog.
In the present embodiment, direct current energy meter to be calibrated belongs to semi-manufacture, and its lid can be opened.Therefore open the lid of direct current energy meter, by Zero-ohm resistor wire by short circuit point (J1, J2 and J3) short circuit in analog.Be equivalent to after above-mentioned short circuit point short circuit sample rate current simulating signal and voltage analog signal directly be connected in analog, thus make theoretical current sampled value and theoretical voltage sampled value be zero.DC offset is the electrical noise of circuit itself, has nothing to do with input signal.Therefore, when sampled signal connects in analog, the measured value of direct current energy meter is then fixed as measured value when accessing without sampled signal, i.e. the DC offset of direct current energy meter.
S220, controls direct current energy meter work.
Control device controls direct current energy meter work, namely controls direct current energy meter and measures.The working power of direct current energy meter is provided by the first back work power supply.Because the first accessory power supply is only as the working power of direct current energy meter, not refinement accuracy, only needs in working range, not high to its stability requirement.Direct current energy meter obtains the first magnitude of voltage U after carrying out Analog-digital Converter to sample rate current and sampled voltage
1with the first current value I
1.
S230, the first magnitude of voltage that the measurement of record direct current energy meter obtains and the first current value.
In the present embodiment, the first magnitude of voltage U
1with the first current value I
1just carry out reading and record after needing to wait for MCU (microprocessor) in direct current energy meter and metering module working stability, thus guarantee the first magnitude of voltage U of measuring
1with the first current value I
1accuracy.In measuring process, direct current energy meter metering module can carry out sampling and analog digital (AD) is changed.Metering module in direct current energy meter carries out sampling the principle changed with analog digital (AD) as shown in Figure 3, namely there is following logical relation between DC offset and gain:
Measured value=(original value+DC offset) × gain.
Carrying out in calibration process to DC offset, the voltage and current gain of the MCU acquiescence metering module of direct current energy meter is 1.Because of sampled signal ground connection, measured value now is then fixed as measured value when accessing without sampled signal, and namely original value is 0, and the measured value of direct current energy meter is DC offset.That is, the first magnitude of voltage U
1for DC voltage offset amount U
offset, the first current value I
1for direct current offset amount I
offset.By the first magnitude of voltage U
1be designated as DC voltage offset amount U
offsetand the first current value I
1be designated as direct current offset amount I
offsetafter preserve.In the present embodiment, the DC voltage offset amount U of record
offsetwith direct current offset amount I
offsetalso can send to the register in the MCU in direct current energy meter.In one embodiment, the MCU in direct current energy meter also can directly by the first magnitude of voltage U
1be designated as DC voltage offset amount U
offsetand the first current value I
1be designated as direct current offset amount I
offsetafter preserve.
In the present embodiment, by by close for short circuit point (J1, J2 and J3) VGAD concentrated setting in analog, the length of shorting stub in short circuit process can be reduced, thus the electromagnetic interference (EMI) that reduction shorting stub brings, improve the sampling precision of sampled signal, and then be conducive to improving calibration accuracy.This printed circuit board (PCB) (pcb board) is adopted to be designed with to be beneficial to and to add strong anti-interference ability.The short circuit point of short circuit is not set in traditional direct current energy meter specially, therefore each section to connect punishment cloth comparatively discrete, need longer suspended conductors by its short circuit in analog.Wire is long makes impedance increase, or is suspended from the shortcoming being vulnerable to electromagnetic interference (EMI) outside pcb board, thus cannot reliably obtain correct DC offset.Table 1 carries out the measurement data of DC offset calibration process for adopting the method for attachment in the present embodiment and adopts flotation line short circuit method (namely using suspended conductors to carry out short circuit) to carry out the contrast table of the measurement data of DC offset calibration process.
Table 1
Wherein, the computing formula of data variation maximum error rate is:
As can be seen from Table 1, the short circuit method that the present embodiment adopts has less error range relative to flotation line short circuit method, namely has higher calibration accuracy.
S240, the short circuit at off voltage input end and current input terminal place.
After the calibration completing DC offset, each short circuit point place is disconnected, therefore can not affect the normal work of direct current energy meter.
S120, calibrates gain.
In the present embodiment, due to separate between S110 and S120, therefore the order of the two can be exchanged, thus when having made multiple direct current energy meter need to calibrate, S110 and S120 can be performed respectively, to improve calibration efficiency to different direct current energy meters simultaneously.Particularly, adopt the second frock to calibrate gain, the idiographic flow of gain calibration as shown in Figure 7, comprises step S310 ~ S340.
S310, is promoted to calibration point by the output of DC source.
In order to calibration result can be applicable to the whole measurement range of direct current energy meter, set calibration point must be representative in measurement range.The voltage of calibration point is the voltage of magnitude of voltage in 30% ~ 70% scope of the voltage range of direct current energy meter obtained after direct current energy meter is measured; The electric current of the current value that the electric current of calibration point obtains after being similarly and direct current energy meter being measured in 30% ~ 70% scope of the current range of direct current energy meter.In the present embodiment, the voltage specification of direct current energy meter is U
max, current specification is I
max, the voltage of calibration point is U
max× 10%, the electric current of calibration point is I
max× 10%.Can ensure that direct current energy meter is in linear condition in measurement range after the calibration of this calibration point, thus ensure the accuracy of whole measurement range.In other examples, can arrange calibration point according to specific needs, and be not limited to specific embodiment disclosed in the present embodiment.
After confirmation calibration point, carry out rising source operation to DC source, the output of DC source is promoted to calibration point.
S320, controls direct current energy meter and measures DC source.
Before carrying out the measurements, also first can carry out initialization operation to direct current energy meter, thus avoid measuring the interference being subject to other factors, improve calibration accuracy.
S330, record direct current energy meter carries out the voltage original value before Analog-digital Converter and electric current original value.
In the present embodiment, DC source adopts standard DC source.Standard DC source is called the source of cutting when an output point switches to another one output point.Standard DC source needs certain stabilization time when carrying out cutting source and exporting.Therefore measure initial stage DC source and instability, certain error can be caused to measurement.In the present embodiment, voltage original value U
0with electric current original value I
0reading and record need to wait for that DC source is in steady state (SS) and just carries out, thus guarantee the accuracy of the data read.Voltage original value before direct current energy meter carries out Analog-digital Converter and electric current original value are the voltage and current that DC source calibration point is arranged.
S340, the second magnitude of voltage that the measurement of record direct current energy meter obtains and the second current value.
The second magnitude of voltage U that the measurement of record direct current energy meter obtains
2with the second current value I
2, namely direct current energy meter carries out the magnitude of voltage after Analog-digital Converter and current value.
S130, calculating voltage gain and current gain.
DC voltage offset amount U is obtained owing to having measured in S110
offsetwith direct current offset amount I
offset, therefore can calculate voltage gain U in conjunction with the data measured in S120 and the logical relation between DC offset and gain
gainand I
gain.
Particularly, according to the first magnitude of voltage (i.e. DC voltage offset amount U
offset), Initial Voltage Value U
0with the second magnitude of voltage U
2the formula of calculating voltage gain is as follows:
U
2=(U
0+ U
offset) × U
gain, namely
U
gain＝U
2÷(U
0+U
offset)。
In like manner, according to the first current value (i.e. DC voltage offset amount I
offset), electric current initial value I
0with the second current value I
2calculate current gain I
gain.
S140, sends to direct current energy meter to complete calibration to direct current energy meter by DC voltage offset amount, direct current offset amount, voltage gain and current gain.
The DC voltage offset amount U that calibration process is obtained
offset, direct current offset amount I
offset, voltage gain U
gainwith current gain I
gainsend to direct current energy meter.Above-mentioned calibrator quantity is stored in the register in MCU by direct current energy meter, thus completes the calibration to direct current energy meter.
In above-mentioned direct current energy meter correction method, when calibrating DC offset, to adopt voltage input end, current input terminal short circuit in method in analog, improve the sampling precision of the sampled signal of direct current energy meter, and then improve calibration accuracy.Further, be calibrated to two independently steps to DC offset and gain in calibration process, interference is therebetween less and only need once to rise source operation (DC source is promoted to calibration point).Because standard DC source needs certain stabilization time after carrying out cutting source, so the increase source that once rises operates to be equivalent to increase once cuts source time.In traditional checking procedure, because electric energy meter output is comparatively large, carrying out an electric energy meter calibration just needs more than twice, the source of cutting, and multiple electric energy meter just needs repeatedly to cut source, quite expends time in.If think that saving is cut source time and just needed that two cover DC source equipment are fixing rises one, source calibration point, but correspondingly expend equipment (standard dc source belongs to an equipment costly).And the correction method in the present embodiment only needs once the source of rising to operate, save the alignment time greatly and calibration cost lower, can needs of production be met.
Present invention also offers a kind of direct current energy meter meter correcting system, for performing above-mentioned direct current energy meter correction method, the direct current energy meter in the present invention being calibrated.As shown in Figure 8, it comprises the first frock 810, second frock 820 and main control unit 830 to the structured flowchart of this direct current energy meter meter correcting system.
First frock 810 is for calibrating DC offset.Fig. 9 is the structural representation of the first frock 810.First frock 810 comprises direct current energy dial framework 812, short-circuit device (not shown), first control device (not shown) and back work power supply 814.Wherein, direct current energy dial framework 812 for placing direct current energy meter, and is electrically connected with direct current energy meter.Short-circuit device is used for the voltage input end of direct current energy meter and current output terminal (each short circuit point namely in direct current energy meter) short circuit in analog.In the present embodiment, short-circuit device can be Zero-ohm resistor wire.The power supply of back work power supply 814 for providing direct current energy meter normally to work.On the 5th terminal that back work power supply 814 is connected to direct current energy dial framework 812 and the 6th terminal.First control device is then for after short-circuit device carries out short circuit to the voltage input end of direct current energy meter and current input terminal, control direct current energy meter works, namely measure, thus the first magnitude of voltage of obtaining and the first current value measured in record, and the first magnitude of voltage is designated as DC voltage offset amount and controls short-circuit device after the first current value is designated as direct current offset amount and disconnect.In other example, short circuit or the disconnection at current input terminal and voltage input end place also can by manually operating.
Second frock 820 is for calibrating gain.Figure 10 is the structural representation of the second frock 820, and it comprises direct current energy dial framework 822, second control device (not shown), back work power supply 824 and DC source 826.Wherein, direct current energy dial framework 822 for placing direct current energy meter, and is electrically connected with direct current energy meter.Direct current energy dial framework 822 is identical with the structure of direct current energy dial framework 812.Back work power supply 824 is same for providing groundwork power supply for direct current energy meter.Back work power supply 824 is connected to the 5th terminal and the 6th terminal of direct current energy dial framework 822.DC source 826 is standard DC source, as the current source to be measured of calibration.DC source 826 is connected with the 1st terminal ~ the 4th terminal of direct current energy dial framework 822 respectively.Second control device can carry out rising source operation to DC source 826 according to the calibration command received, and is exported and rises to calibration point.Second control device DC source 826 complete rise source operation after control direct current energy meter DC source 826 measured, and wait for DC source 826 stable after record direct current energy meter carry out Analog-digital Converter before Initial Voltage Value and (obtaining namely after Analog-digital Converter) second magnitude of voltage of obtaining of voltage original value (i.e. the voltage and current value at calibration point place) and measurement and the second current value.
Main control unit 830 is connected with the second control device in the first control device in the first frock 810, the second frock 820 respectively, and independent control is carried out to first control device and second control device, thus first control device and second control device are independently carried out, what namely make the calibration of DC offset and gain is calibrated to two independently steps.Main control unit 830 according to the first magnitude of voltage, voltage original value and the second magnitude of voltage calculating voltage gain, and according to the first current value, electric current original value and the second current value calculating current gain.Main control unit 830 is also for sending to direct current energy meter to complete calibration to direct current energy meter by DC voltage offset amount, described direct current offset amount, voltage gain and current gain.
In above-mentioned direct current energy meter meter correcting system, when calibrating DC offset, to adopt voltage input end, current input terminal short circuit in method in analog, improve the sampling precision of the sampled signal of direct current energy meter, and then improve calibration accuracy.Further, independently carry out the calibration of DC offset and gain, interference is therebetween less and only need once to rise source operation (DC source is promoted to calibration point), saves the alignment time greatly.And this meter correcting system structure is simple, and cost is lower, can meet needs of production.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a direct current energy meter correction method, comprises the step of calibrating DC offset and the step of calibrating gain; Described the step that DC offset is calibrated to be comprised
By the voltage input end of direct current energy meter and current input terminal short circuit in analog,
Control described direct current energy meter work,
The first magnitude of voltage that the measurement of record direct current energy meter obtains and the first current value, and described first magnitude of voltage is designated as DC voltage offset amount and described first current value is designated as direct current offset amount,
Disconnect the short circuit at described voltage input end and described current input terminal place;
Described the step that gain is calibrated to be comprised
The output of DC source is promoted to calibration point,
Control direct current energy meter to measure described DC source,
Record direct current energy meter carries out the voltage original value before Analog-digital Converter and electric current original value,
The second magnitude of voltage that the measurement of record direct current energy meter obtains and the second current value;
Described method also comprises step:
According to described first magnitude of voltage, voltage original value and described second magnitude of voltage calculating voltage gain, and according to described first current value, electric current original value and described second current value calculating current gain; And
Described direct current energy meter described DC voltage offset amount, described direct current offset amount, described voltage gain and described current gain is sent to complete calibration to described direct current energy meter.
2. direct current energy meter correction method according to claim 1, is characterized in that, described by the voltage input end of direct current energy meter and current input terminal short circuit in step in analog, current input terminal comprises positive current input end and negative current input end.
3. direct current energy meter correction method according to claim 2, is characterized in that, short circuit adopts Zero-ohm resistor wire to carry out short circuit.
4. direct current energy meter correction method according to claim 1, it is characterized in that, the step of the first magnitude of voltage that the measurement of described record direct current energy meter obtains and the first current value is specially: record the first magnitude of voltage and the first current value that direct current energy meter measurement obtains after waiting for the metering module working stability of described direct current energy meter again.
5. direct current energy meter correction method according to claim 1, it is characterized in that, the described output by DC source is promoted in the step of calibration point, and the voltage of described calibration point is make the voltage of the measuring voltage value of described direct current energy meter in 30% ~ 70% scope of the voltage range of described direct current energy meter; The electric current of described calibration point is make the electric current of the measurement current value of described direct current energy meter in 30% ~ 70% scope of the current range of described direct current energy meter.
6. direct current energy meter correction method according to claim 1, it is characterized in that, after the step that described control direct current energy meter is measured described DC source, before described record direct current energy meter carries out the step of the voltage original value before Analog-digital Converter and electric current original value, also comprise and initialized step is carried out to the metering module of described direct current energy meter.
7. direct current energy meter correction method according to claim 6, it is characterized in that, the step of the voltage original value before described record direct current energy meter carries out Analog-digital Converter and electric current original value needs just to carry out record after the output of described DC source is in steady state (SS);
The step of the second magnitude of voltage that the measurement of described record direct current energy meter obtains and the second current value needs to stablize laggard line item at the metering module of described direct current energy meter.
8. a direct current energy meter meter correcting system, is characterized in that, comprises the first frock for calibrating DC offset, for second frock of calibrating DC offset and main control unit;
Described first frock, comprises short-circuit device and first control device; Described short-circuit device is used for the voltage input end of direct current energy meter and current input terminal short circuit in analog; Described first control device is measured for controlling described direct current energy meter, the first magnitude of voltage that record direct current energy meter measurements obtains and the first current value, and described first magnitude of voltage is designated as DC voltage offset amount and controls the disconnection of described short-circuit device after described first current value is designated as direct current offset amount;
Described second frock, comprises DC source and second control device; Described second control device respectively with described DC source, described direct current energy list catenation; The output of described DC source is promoted to calibration point for controlling by described second control device; Described second control device is also measured described DC source for controlling described direct current energy meter after the output of DC source is promoted to calibration point, and record described direct current energy meter carry out Analog-digital Converter before Initial Voltage Value and the second magnitude of voltage of obtaining of voltage original value and described direct current energy meter measurement and the second current value;
Described main control unit is used for according to described first magnitude of voltage, voltage original value and described second magnitude of voltage calculating voltage gain, and according to described first current value, electric current original value and described second current value calculating current gain; Described main control unit is also for sending to described direct current energy meter to complete calibration to described direct current energy meter by described DC voltage offset amount, described direct current offset amount, described voltage gain and described current gain.
9. direct current energy meter meter correcting system according to claim 8, is characterized in that, described first control device and described second control device carry out independent control respectively by described main control unit.
10. direct current energy meter meter correcting system according to claim 8, is characterized in that, described direct current energy meter comprises printed circuit board (PCB); Described printed circuit board (PCB) is provided with current sampling circuit and voltage sampling circuit; Described printed circuit board (PCB) is also provided with for the short circuit point carrying out short circuit in analog; Described short circuit point is arranged at the voltage input end of described voltage sampling circuit and the current input terminal of described current sampling circuit and arranges in analog near described; Short-circuit device in described first frock is used for described short circuit point short circuit in analog described.
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