CN103018699A - Device and method for calibrating and detecting sensor and AD convertor of multiple devices - Google Patents

Device and method for calibrating and detecting sensor and AD convertor of multiple devices Download PDF

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Publication number
CN103018699A
CN103018699A CN2012105444245A CN201210544424A CN103018699A CN 103018699 A CN103018699 A CN 103018699A CN 2012105444245 A CN2012105444245 A CN 2012105444245A CN 201210544424 A CN201210544424 A CN 201210544424A CN 103018699 A CN103018699 A CN 103018699A
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host computer
passage
signal
sensor
acquisition
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CN2012105444245A
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CN103018699B (en
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赵耀
倪恺
谷兴华
周玲玲
江军谊
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天津瑞能电气有限公司
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Abstract

The invention provides a device and a method for calibrating and detecting a sensor and an AD convertor of multiple devices. An acquisition processing module comprises a plurality of acquisition processing units, and the acquisition processing units are connected in parallel; a plurality of signal sensing units of a signal sensing unit group are respectively connected with each acquisition processing unit, an input source signal is converted into a secondary side signal corresponding with acquisition requirements through the signal sensing unit group, and the secondary side signal is converted into a digital signal through the acquisition processing units and then is transmitted to an upper computer through a 485 communication circuit; and the upper computer processes and displays signal data. The device and the method for calibrating and detecting the sensor and the AD convertor of multiple devices have the advantages that a large linear error in collected data due to an own characteristic of operational amplification in the sensor and the AD convertor is avoided, the technical problems of deviation and scaling of the collected data are solved, and furthermore normal operation of a wind power frequency converter is guaranteed. The device and the method for calibrating and detecting the sensor and the AD convertor of multiple devices have the advantages that a skillful engineer only needs 1-3 minutes to complete adjusting a single wind power frequency converter, a personal error is small and the like.

Description

To the sensor of many equipment, the apparatus and method that AD converter is calibrated, detected
Technical field
The invention belongs to the checkout equipment field of sensor and AD converter, especially relate to the system that a kind of sensor to a plurality of equipment, AD converter are calibrated, detected.
Background technology
Wind energy, as a kind of clean regenerative resource, more and more is subject to the attention of countries in the world.The power cost that wind-power electricity generation produces is more much lower than the cost of electricity-generating of compact internal combustion engine.In recent years, due to actuation time of Frequency Converter Control generator rotor current frequency below Millisecond.When high-frequency wind speed changes, can guarantee that by the instantaneous change generator rotor current of frequency converter frequency genset can catch up with the frequent variations of wind speed, make the stable output of the power of the assembling unit, the harmful effect that reduction is impacted electrical network, also can reduce the operating frequency of pulp distance varying mechanism, extend the serviceable life of pulp distance varying mechanism simultaneously.So wind power frequency converter is one of requisite core component in wind power generation field, its major function is by the excitation to generator, realizes the control of wind-powered electricity generation unit output power and grid-connected.In the installation operational process, the sensor in wind power frequency converter and AD converter, as the detection means commonly used of wind power frequency converter electric current and voltage signal, play vital effect in the stable operation of frequency converter.Sensor is as the source of signals collecting, and the detection of the parameters such as its linearity, precision is most important, but due to the self-characteristic of the amplifier in sensor, AD passage, there is larger linear error in the data that collect, cause the problem that produces side-play amount.For fear of the normal operation of this linear error and then assurance wind power frequency converter, before wind power frequency converter dispatches from the factory, the controller of wind power frequency converter must be calibrated one by one comparison and revise through the experimenter.
In prior art, in AD passage calibration process, the experimenter adopts oscillograph to carry out the inspection of above-mentioned side-play amount usually, and artificial reading is observed the accuracy of calibration, the slip-stick artist of a skilled operation completes the separate unit wind power frequency converter is adjusted to need of work 2-3 hour, and personal error is larger.And sensor carries out manual detection, exist especially task heavy, there is no fixing frock, realize very difficult.Generally, each batch of normally a lot of platforms of frequency converter that needs dispatch from the factory, can only be inspected by random samples by artificial visually examine's waveform, can't guarantee the correctness of each sensor.The linear characteristic that there is no effective detection method test sensors, and can't solve the technical matterss such as ratings detection.Now exist and wasted a large amount of human and material resources and time simultaneously, and precision is not easy the technical matterss such as control.
Summary of the invention
The problem to be solved in the present invention is to provide the skew of the signal value that a kind of linear error that can adjust due to image data causes and flexible, so that the apparatus and method of further frequency converter being calibrated and being revised, the system that especially applicable a kind of sensor to a plurality of equipment, AD converter are calibrated, detected.
For solving the problems of the technologies described above, a kind of novel device that sensor, AD converter are calibrated, detected of the technical solution used in the present invention, it is characterized in that: comprise sensing unit group, acquisition processing module and host computer, acquisition processing module comprises several acquisition process unit, and acquisition process is connected in parallel between unit; Sensing unit group comprises several sensing unit; The sensing unit is connected with each acquisition process unit respectively, the input source signal is converted to meet by sensing unit group and gathers the secondary signal required, and the secondary signal is digital signal by the acquisition process cell translation and passes to host computer by 485 communicating circuits; Host computer is processed, is shown signal data.
Further, described sensing unit comprises voltage sensor unit and/or current sensing unit; The secondary current signal is that the digital signal row operation of going forward side by side is processed by current sensing unit and acquisition process cell translation successively; The secondary voltage signal is that the digital signal row operation of going forward side by side is processed by voltage sensor unit and acquisition process cell translation successively.
Further, described current sensing unit comprises that current sensor, current transformer and electric current amplify terminal, amplifies terminal by electric current and is refluxed, streams on the current sensor summation current transformer, increases current value, then exports to the acquisition process unit; The input end series connection isolating switch of current sensing unit.
Further, described current sensing unit also comprises the IGBT module, and the IGBT module is connected between isolating switch and current sensor.Further, described voltage sensor unit comprises transformer, voltage sensor, by after transformer regulating, voltage being imported to voltage sensor, obtains the secondary signal and exports to the acquisition process unit; The input end series connection isolating switch of voltage sensor unit.
Further, the described novel device that sensor, AD converter are calibrated, detected also comprises temperature detecting module, and described temperature detecting module is connected with host computer, and temperature detection result is passed to host computer; Host computer, to the processing of comparing of temperature detection data, when rreturn value value of being above standard of temperature detecting module, carries out break-make control by acquisition process unit and IGBT module successively.
Further, the calibrating method that the device that use is calibrated, detected sensor, the AD converter of a plurality of equipment carries out the AD passage of AD converter, comprise the following steps: target acquisition process undetermined unit is accessed to 485 communicating circuits, setting host computer is main website, and the acquisition process unit is slave station; An optional slave station is as the standard slave station, and the AD passage of standard slave station is as standard A D passage, the approximate source signal f0 (t) using the signal of standard A D passage as actual source signal F0 (t).Other slave station is as slave station to be measured, and the AD passage of slave station to be measured is AD passage to be measured, and the signal of AD passage to be measured is detection signal fM (t); Host computer sends broadcasting packet and controls each standard A D passage and AD passage to be measured, in an identical manner signal is sampled, and is stored sampled data into host computer; Host computer, by the mode of poll, is aggregated into host computer by the sampled data of the fM (t) of the sampled data of the f0 (t) of each standard A D passage and corresponding AD passage to be measured respectively; Host computer according to the first direct integral fitting process, the second direct integral fitting process, the 3rd direct integral fitting process, linear regression fit method, indirectly the integration fitting process or manually waveform fitting ask for respectively the flexible ratio k value of each AD passage to be measured and the off-set value b value line item of going forward side by side; Step a1 is repeated N time to step a5, and the k value that will at every turn try to achieve and b value draw respectively corresponding k_n, the b_n curve; To the k_n of AD passage to be measured, the b_n curve carries out linear regression respectively, draws the mean value of k value and the mean value of b value; Derive the standard value parameter list;
Further, detection method according to described calibrating method to AD converter, comprise the following steps: host computer sends broadcasting packet and controls each standard A D passage and AD passage to be measured, respectively signal is sampled in an identical manner, and sampled data is stored; Host computer is by the mode of poll, respectively the sampled data of the sampled data of each standard A D passage f0 (t) and corresponding fM (t) is aggregated into to host computer; Host computer is drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence; Host computer compares to " f0_fM " scatter diagram the conclusion that show that whether passage is qualified
Further, detection method according to described calibrating method to sensor, comprise the following steps: host computer sends broadcasting packet and controls in the standard A D passage of each slave station and slave station to be measured and respectively signal is sampled with the AD passage to be measured be connected of sensor, and sampled data is stored; Host computer is by the mode of poll, will in the sampled data of the f0 (t) of each standard A D passage and slave station to be measured, with the sampled data of the fM be connected (t) of sensor, be aggregated into host computer respectively; Host computer is drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence; Host computer compares to " f0_fM " scatter diagram the conclusion that show that whether sensor is qualified.
Further, the scope of actual source signal F0 (t) sample frequency is 40K-100K; Or the waveform of actual source signal F0 (t) is undistorted, harmonic content is less than 3%.
Advantage and good effect that the present invention has are: owing to adopting technique scheme, avoid the self-characteristic due to amplifier in sensor, AD passage, there is larger linear error in the data that collect, cause the skew of image data and flexible technical matters, and then guaranteed the normal operation of wind power frequency converter.The slip-stick artist of a skilled operation completes the separate unit wind power frequency converter is adjusted to need of work 1-3 minute, and personal error is very little.And then reduced the workload that manual detection exists especially.The testing that wind power frequency converter is dispatched from the factory is easier, the demonstration of data is more directly perceived, easy to maintenance, the advantages such as the manpower and materials cost of detection significantly reduces, the obvious raising of detection efficiency.
The accompanying drawing explanation
Fig. 1 is the principle schematic that prior art sensor of the present invention gathers
Fig. 2 is the principle schematic of prior art AD passage of the present invention
Fig. 3 is calibration principle schematic of the present invention
Fig. 4 is detection principle schematic of the present invention
Fig. 5 is circuit theory schematic diagram of the present invention
In figure:
1, main website 2, acquisition process unit 3,485 communicating circuits
4, isolating switch 5, transformer 6, IGBT module
7, power supply
Embodiment
As shown in Figure 1, in the frequency converter operational process, input source signal F 0(t) finally obtain detection signal f through sensor and signal processing circuit processing m(t), and by f m(t) being transferred to computing machine participates in controlling.In this process, the line styles variations such as flexible or skew can occur in signal usually, thereby make detection signal f mand input source signal F (t) 0(t) produce deviation from linearity.In order to guarantee the characteristic of the detection signal accurate response input source signal that participation is controlled, need to carry out the line style compensation to detection signal, consistent with source signal to the detection signal after compensation.Asking for the process of the compensation correlation parameter of detection signal calibrates exactly.
Because deviation of signal is linear, thereby signal compensation is also linear.
If the flexible ratio of actual signal is A, the off-set value of actual signal is B, and detection signal is f m(t), the input source signal is F 0(t) process that, produces deviation of signal can be abstract be formula:
f M(t)=A?F 0(t)+B;,
If approximate flexible ratio is k, the approximate offset value is b, and detection signal is f m(t) process of, in like manner carrying out signal compensation can be abstract be formula:
F 0(t)=k?f M(t)+b。
Calibration is exactly to ask approximate process of getting flexible ratio k and approximate offset value b in essence.
As shown in Figure 2, in actual calibration process, we can only pass through the AD passage of a standard to F 0(t) detect an approximate source signal f who obtains it 0(t), then based on approximate source signal f 0(t) calibrate.Approximate source signal f 0and detection signal f (t) m(t), ignore the nonlinearity erron of AD passage, they and input source signal F 0(t) following relation is arranged:
(1) work as f 0and f (t) m(t) when sampling phase is identical:
f 0(t)=αF 0(t)+β,(α≈1,|β|≈0)
f M(t)=A?F 0(t)+B,(A>0)
(2) work as f 0and f (t) m(t) when sampling phase is different:
f 0(t)=αF 0(t)+β,(α≈1,|β|≈0)
Derive and can obtain by relation (1):
f M(t)=A’f 0(t)+B’
A=α A ' wherein, B=B '+A ' β
Derive and can obtain by relation (2):
A=α A ' wherein, B=B '+A ' β
That is: A ≈ A ', the margin of error (1-α) A '; B ≈ B ', margin of error A ' β
In practice owing to can not get F 0(t), so we can't try to achieve A value and B value, and it is then approximate as A value and B value using A ' value and B ' value to try to achieve A ' value and B ' value by certain algorithm, and then tries to achieve flexible ratio k and the off-set value b of calibration.
If the input source signal is F 0(t), source signal is f 0(t), measuring-signal is f m(t), sampling time length is T, F 0(t), f 0and f (t) m(t) meet a group in following a few set condition combination.
1. to F 0(t) sample frequency as far as possible high (more preferably greater than equaling 50K), or the frequency of F0 (t) is as far as possible low.
2.F 0(t) waveform continuously and change as far as possible mild.
3.f M(t)=A’f 0(t)+B’
The character of periodic function:
If f (t) [0 ,+∝) on be with T 0for the periodic function in cycle, and T=nT 0, (n=1,2,3 ...)
Just like drawing a conclusion:
( 1 ) , ∫ T 0 T 0 + x f ( t ) dt = ∫ 0 x f ( t ) dt , ( x ≥ 0 )
( 2 ) , ∫ x x + T 0 f ( t ) dt = ∫ 0 T 0 f ( t ) dt , ( x ≥ 0 )
Proof:
( 1 ) , ∫ T 0 T 0 + x f ( t ) dt = ∫ T 0 T 0 + x f ( t - T 0 ) dt
If y=t-T 0, work as t at [T 0, T 0+ x] in while changing y in [0, x], change, and dy=dt,
So above formula
= ∫ 0 x f ( y ) dy
= ∫ 0 x f ( t ) dt
( 2 ) , ∫ x x + T 0 f ( t ) dt = ∫ x 0 f ( t ) dt + ∫ 0 T 0 f ( t ) dt + ∫ T 0 x + T 0 f ( t ) dt
By conclusion (1), above formula
= ∫ 0 T 0 f ( t ) dt + ∫ x 0 f ( t ) dt + ∫ 0 x f ( t ) dt
= ∫ 0 T 0 f ( t ) dt
(3) establish work as t at [x, x+T 0] in while changing y exist interior variation, and
Dy=dt, so:
By conclusion (1), above formula
Because f (t) [0 ,+∞) upper with T 0for the cycle, so | f (t) | also [0 ,+∞) upper with T 0for the cycle,
By conclusion (3) above formula
= ∫ 0 T 0 | f ( t ) | dt + ∫ T 0 2 T 0 | f ( t ) | dt + . . . + ∫ ( n - 1 ) T 0 nT 0 | f ( t ) | dt
= ∫ 0 T | f ( t ) | dt
By conclusion (3), above formula
= ∫ 0 T 0 f ( t ) dt + ∫ T 0 2 T 0 f ( t ) dt + . . . + ∫ ( n - 1 ) T 0 nT 0 f ( t ) dt
By conclusion (2), above formula
As shown in Figure 3, the course of work of the present invention is:
1, the step of calibration:
At first, acquisition process to be measured unit is accessed to 485 communicating circuits, setting the computing machine that host computer is installed is main website 1, and each acquisition process unit 2 is slave stations.
An optional slave station is as the standard slave station, and the AD passage of standard slave station is as standard A D passage, using the signal of standard A D passage as source signal f0 (t).Other slave station is as slave station to be measured, and the AD passage of slave station to be measured is AD passage to be measured, and the signal of AD passage to be measured is as detection signal fM (t).Host computer transmission broadcasting packet controls each standard A D passage and AD passage to be measured is sampled to signal respectively, and stored sampled data into host computer according to identical mode, requirement.
Host computer is by the mode of poll, respectively the sampled data f0 (t) of each standard A D passage and AD passage to be measured carried out to sampled data fM (t) and is aggregated into host computer.
Take the first direct integral fitting process, the second direct integral fitting process, the 3rd direct integral fitting process, linear regression fit method, indirectly the integration fitting process or manually a kind of algorithm in waveform fitting calculate the k value of asking for each AD passage and the b value line item of going forward side by side.
Under identical input signal, above-mentioned steps is repeated N time, and the k value that will at every turn try to achieve and b value draw respectively corresponding k_n, the b_n curve.
To the k_n of AD passage to be measured, the b_n curve carries out linear regression respectively, draws the mean value of k value and the mean value of b value.
Derive the standard value parameter list.
2, AD channel linear Characteristics Detection:
At first, acquisition processing module to be measured is accessed to 485 communicating circuits, send broadcasting packet by host computer and control each standard A D passage and AD passage to be measured, respectively signal is sampled in an identical manner, and sampled data is stored; Host computer is by the mode of poll, respectively the sampled data of the sampled data of each standard A D passage f0 (t) and corresponding fM (t) is aggregated into to host computer; Host computer is drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence; Finally, host computer compares " f0_fM " scatter diagram, specifically investigates the linear dependence of the loose point of " f0_fM " scatter diagram set.If the loose point of " f0_fM " scatter diagram is gathered to such an extent that the linear dependence degree is very high, illustrate that the linearity of this sensor is better, otherwise illustrate that its linearity is poor.Finally, draw the conclusion whether passage is qualified.
3, sensor, mutual inductor linear characteristic detect:
At first, acquisition processing module to be measured is accessed to 485 communicating circuits, send broadcasting packet by host computer and control in the standard A D passage of each slave station and slave station to be measured and respectively signal is sampled with the AD passage to be measured be connected of sensor, and sampled data is stored.Host computer is by the mode of poll, will in the sampled data of the f0 (t) of each standard A D passage and slave station to be measured, with the sampled data of the fM be connected (t) of sensor, be aggregated into host computer respectively.Host computer is drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence.Host computer compares " f0_fM " scatter diagram, specifically investigates the linear dependence of the loose point of " f0_fM " scatter diagram set and the difference of regression straight line and straight line " f0=fM ".If the loose point of " f0_fM " scatter diagram is gathered to such an extent that the linear dependence degree is very high, illustrate that the linearity of this sensor is better, otherwise illustrate that its linearity is poor.If the loose point of " f0_fM " scatter diagram is gathered to obtain the very high and regression straight line of linear dependence degree and straight line " f0=fM " is basic overlaps, illustrate that this sensor does not have linear distortion, otherwise illustrate that it has linear distortion.Finally, draw the conclusion whether sensor is qualified.
As shown in Fig. 4, Fig. 5 combination, the described novel device that sensor, AD converter are calibrated, detected, it is characterized in that: comprise sensing unit group, acquisition processing module and host computer, acquisition processing module comprises several acquisition process unit, and acquisition process is connected in parallel between unit; Sensing unit group comprises several sensing unit; The sensing unit is connected with each acquisition process unit respectively, the input source signal is converted to meet by sensing unit group and gathers the secondary signal required, the secondary signal is digital signal by the acquisition process cell translation, and passes to host computer by 485 communicating circuits; Host computer is processed, is shown signal data.Acquisition processing module adopts DSP, and DSP is 28335 of TI.
Described sensing unit comprises voltage sensor unit and/or current sensing unit.The secondary current signal is that the digital signal row operation of going forward side by side is processed by current sensing unit and acquisition process cell translation successively; The secondary voltage signal is that the digital signal row operation of going forward side by side is processed by voltage sensor unit and acquisition process cell translation successively.Described current sensing unit comprises that current sensor, current transformer and electric current amplify terminal, amplifies terminal by electric current and is refluxed, streams on the current sensor summation current transformer, increases current value, then exports to the acquisition process unit; The input end series connection isolating switch of current sensing unit.Effect is: by the current conversion of input source signal, be to meet the electric signal that collecting unit requires.Described current sensing unit also comprises the IGBT module, and the IGBT module is connected between isolating switch and current sensor, and the IGBT module is connected with the acquisition process unit.The IGBT module, for when rreturn value value of being above standard of temperature detecting module, is carried out break-make control by DSP and IGBT module successively.Described voltage sensor unit comprises transformer, voltage sensor, by after transformer regulating, voltage being imported to voltage sensor, obtains the secondary signal and exports to the acquisition process unit; The input end series connection isolating switch of voltage sensor unit.
Described acquisition process unit comprises AD converter and/or collection of simulant signal processing subelement, collection of simulant signal is processed subelement and is connected with AD converter, and the secondary current signal is processed subelement, AD converter by collection of simulant signal successively and is converted to the digital signal row operation processing of going forward side by side.The secondary voltage signal is processed subelement, AD converter by collection of simulant signal successively and is converted to the digital signal row operation of going forward side by side and processes.
The described novel device that sensor, AD converter are calibrated, detected also comprises temperature detecting module, and described temperature detecting module is connected with host computer, and temperature detection result is passed to host computer; Host computer, to the processing of comparing of temperature detection data, when rreturn value value of being above standard of temperature detecting module, carries out break-make control by DSP and IGBT module successively.
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.

Claims (10)

1. the sensor to many equipment, AD converter calibration, the device that detects, it is characterized in that: comprise sensing unit group, acquisition processing module and host computer, acquisition processing module comprises several acquisition process unit, and acquisition process is connected in parallel between unit; Sensing unit group comprises several sensing unit; The sensing unit is connected with each acquisition process unit respectively, the input source signal is converted to meet by sensing unit group and gathers the secondary signal required, and the secondary signal is digital signal by the acquisition process cell translation and passes to host computer by 485 communicating circuits; Host computer is processed, is shown signal data.
2. the device that the sensor to many equipment according to claim 1, AD converter are calibrated, detected, it is characterized in that: described sensing unit comprises voltage sensor unit and/or current sensing unit; The secondary current signal is that the digital signal row operation of going forward side by side is processed by current sensing unit and acquisition process cell translation successively; The secondary voltage signal is that the digital signal row operation of going forward side by side is processed by voltage sensor unit and acquisition process cell translation successively.
3. the device that the sensor to many equipment according to claim 2, AD converter are calibrated, detected, it is characterized in that: described current sensing unit comprises that current sensor, current transformer and electric current amplify terminal, amplify terminal by electric current is refluxed, is streamed on the current sensor summation current transformer, increase current value, then export to the acquisition process unit; The input end series connection isolating switch of current sensing unit.
4. the device that the sensor to many equipment according to claim 3, AD converter are calibrated, detected, it is characterized in that: described current sensing unit also comprises the IGBT module, the IGBT module is connected between isolating switch and current sensor.
5. the device that the sensor to many equipment according to claim 2, AD converter are calibrated, detected, it is characterized in that: described voltage sensor unit comprises transformer, voltage sensor, by after transformer regulating, voltage being imported to voltage sensor, obtains the secondary signal and exports to the acquisition process unit; The input end series connection isolating switch of voltage sensor unit.
6. the device that the sensor to many equipment according to claim 1, AD converter are calibrated, detected, it is characterized in that: also comprise temperature detecting module, described temperature detecting module is connected with host computer, and temperature detection result is passed to host computer; Host computer, to the processing of comparing of temperature detection data, when rreturn value value of being above standard of temperature detecting module, carries out break-make control by acquisition process unit and IGBT module successively.
7. the calibrating method that right to use requires the calibration of the 1 described sensor to many equipment, AD converter, the device that detects carries out the AD passage of AD converter comprises the following steps:
A1, target acquisition process undetermined unit is accessed to 485 communicating circuits, setting host computer is main website, and the acquisition process unit is slave station;
A2, an optional slave station be as the standard slave station, and the AD passage of standard slave station is as standard A D passage, the approximate source signal f0 (t) using the signal of standard A D passage as actual source signal F0 (t) ;other slave station is as slave station to be measured, and the AD passage of slave station to be measured is AD passage to be measured, and the signal of AD passage to be measured is detection signal fM (t);
A3, host computer send broadcasting packet and control each standard A D passage and AD passage to be measured, in an identical manner signal are sampled, and are stored sampled data into host computer;
A4, host computer, by the mode of poll, are aggregated into host computer by the sampled data of the fM (t) of the sampled data of the f0 (t) of each standard A D passage and corresponding AD passage to be measured respectively;
A5, host computer according to the first direct integral fitting process, the second direct integral fitting process, the 3rd direct integral fitting process, linear regression fit method, indirectly the integration fitting process or manually waveform fitting ask for respectively the flexible ratio k value of each AD passage to be measured and the off-set value b value line item of going forward side by side;
A6, step a1 is repeated N time to step a5, and the k value that will at every turn try to achieve and b value draw respectively corresponding k_n, the b_n curve;
A7, respectively to the k_n of AD passage to be measured, the b_n curve carries out linear regression, draws the mean value of k value and the mean value of b value;
A8, derivation standard value parameter list.
8. the detection method of calibrating method according to claim 8 to AD converter comprises the following steps:
B1, host computer send broadcasting packet and control each standard A D passage and AD passage to be measured, respectively signal is sampled in an identical manner, and sampled data is stored;
B2, host computer be by the mode of poll, respectively the sampled data of the sampled data of each standard A D passage f0 (t) and corresponding fM (t) is aggregated into to host computer;
B3, host computer are drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence;
B4, host computer compare to " f0_fM " scatter diagram the conclusion that show that whether passage is qualified.
9. the detection method of calibrating method according to claim 8 to sensor comprises the following steps:
C1, host computer send broadcasting packet and control in the standard A D passage of each slave station and slave station to be measured and respectively signal is sampled with the AD passage to be measured be connected of sensor, and sampled data is stored;
C2, host computer be by the mode of poll, will in the sampled data of the f0 (t) of each standard A D passage and slave station to be measured, with the sampled data of the fM be connected (t) of sensor, be aggregated into host computer respectively;
C3, host computer are drawn " f0_fM " scatter diagram according to f0 (t) and fM (t) sequence;
C4, host computer compare to " f0_fM " scatter diagram the conclusion that show that whether sensor is qualified.
10. the calibrating method that the passage of the AD to AD converter according to claim 1 carries out is characterized in that: the scope of actual source signal F0 (t) sample frequency is 40K-100K; Or the waveform of actual source signal F0 (t) is undistorted, harmonic content is less than 3%.
CN201210544424.5A 2012-12-14 2012-12-14 Device and method for calibrating and detecting sensor and AD convertor of multiple devices CN103018699B (en)

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CN103983294A (en) * 2014-05-28 2014-08-13 天津瑞能电气有限公司 Electronic and electrical appliance part linearity and non-linearity detection method
CN107861412A (en) * 2017-09-27 2018-03-30 全球能源互联网研究院有限公司 Signal acquisition method, apparatus and system
CN109613310A (en) * 2018-11-30 2019-04-12 杭州科美特传感器有限公司 Sensor acquires harness
CN110132115A (en) * 2019-05-16 2019-08-16 无锡市迈日机器制造有限公司 The signal adapter and signal correction method of submicron order high-precision HBT displacement sensor

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