CN100381955C - System and method for calibrating analog signal measuring apparatus automatically - Google Patents
System and method for calibrating analog signal measuring apparatus automatically Download PDFInfo
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- CN100381955C CN100381955C CNB200410049679XA CN200410049679A CN100381955C CN 100381955 C CN100381955 C CN 100381955C CN B200410049679X A CNB200410049679X A CN B200410049679XA CN 200410049679 A CN200410049679 A CN 200410049679A CN 100381955 C CN100381955 C CN 100381955C
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Abstract
The present invention discloses a system and a method for automatically calibrating an analog signal measuring device. The method comprises steps that a PC is used for controlling the calibrating process of a calibrated analog signal measuring device, firstly sends a configuration message, and then receives a standard value and a corresponding sample value so as to obtain calibrated parameters, and finally writing the calibrated parameters in the analog signal measuring device; a control card is connected with the PC, is used for receiving the configuration message, executes the control command sent by the PC and sends the obtained standard value and the corresponding sample value back to the PC; a communication card is connected with the control card and used for establishing the communication linkage between the control card and the analog signal measuring device in the process of calibration; a signal source output device in one-to-one correspondence with the analog signal measuring device is respectively connected with the communication card and the analog signal measuring device, is used for generating the standard value according to the configuration message and sends the standard value to the analog signal measuring device so as to obtain the corresponding sample value.
Description
Technical field
The present invention relates to technical field of automatic control, relate in particular to a kind of system and method that analog signal measurement apparatus is demarcated automatically.
Background technology
In industrial automation control field, usually need to measure a large amount of field datas, and the accuracy of those measurement data, real-time directly affect the control of whole automation control system, so the measurement of data seems particularly important.
Wherein, the device that is used for measure analog signals is referred to as analog signal measurement apparatus.See also Fig. 1, it is a theory structure synoptic diagram of analog signal measurement apparatus.It is made up of signal input interface 11, A/D converter 12 (A/D converter), buffer circuit 13, CPU14 and EEPROM (read-only storage reader of electric erasable) 15 and power supply 16 etc.Signal input interface 11 is front end modulate circuits of simulating signal, input signal nursed one's health, as: the current signal for input becomes voltage signal with its linear transformation; For voltage or resistance signal, then carry out corresponding processing and amplifying.It mainly is that the simulating signal that will collect is at first managed the processing of circuit, A/D change-over circuit 12 etc. by preceding withering, and converts digital signal to, then carries out the digital signal standard processing by CPU14, obtains the standard data format that the user wishes at last.
Accurate for what measure, must keep strict linear relationship between the input of analog signal measurement apparatus and the output data.But,, its measuring accuracy is affected owing between different analog signal measurement apparatus, exist all multifactor difference; Even if same analog signal measurement apparatus for different monomers, because there is electric discreteness in other circuit in its front end modulate circuit, A/D change-over circuit and the measurement mechanism, directly influences measuring accuracy; For same measured simulating signal,, may obtain different signal values fully thus if use different analog signal measurement apparatus to measure respectively.So, in the production and application process of analog signal measurement apparatus, must demarcate its precision parameter etc.
Described demarcation, it is exactly each monomer at analog signal measurement apparatus, by more high-precision signal measurement apparatus (afterwards being referred to as high precision measuring device) or output unit, try to achieve the linearization curve of each analog signal measurement apparatus monomer, the parameter that obtains is solidified in this analog signal measurement apparatus, and then eliminate the measurement discreteness between the monomer substantially or the measuring error of each monomer is controlled in the precision allowed band.
See also Fig. 2, it is the system architecture synoptic diagram of known automatic demarcation analog signal measurement apparatus.This system comprises computing machine 21, control card 22, address card 23, high precision measuring device 24 and the analog signal measurement apparatus 25 of being demarcated.Wherein:
PC 21 is used to control and writes the analog signal measurement apparatus 25 of being demarcated, and finishes the parameter calibration process.
High precision measuring device 24 connects analog signal measurement apparatus 25, is used for the reference value or the initial value of measure analog signals measurement mechanism 25.High precision measuring device 24 can adopt multimeter.
In addition, utilize communication card 23 and change-over switch (not illustrating among the figure), several piece analog signal measurement apparatus 25 can be demarcated by this system.
Said system on the base sees also Fig. 3, and prior art adopts following steps to finish the automatic demarcation of analog signal measurement apparatus:
At first carry out step S110: the analog signal measurement apparatus 25 of at first using 24 pairs of quilts of high-accuracy measurement mechanism to demarcate compares measurement, and measurement of comparison refers to measure the reference voltage signal value or the initial precision of this device;
Then carry out step S120: the contrast standard signal obtains calibrating parameters;
Carry out step S130 at last, calibrating parameters is write among the EEPROM (or FLASH) of the analog signal measurement apparatus 25 of being demarcated, finish parameter calibration by PC 21 control address cards 23.
For example, adopt the analog signal measurement apparatus of biproduct somatotype A/D principle, directly measure integration reference voltage in this analog signal measurement apparatus by using the high precision measurement mechanism, then the value of this reference voltage is carried out standardization, conversion is will write integral time in the EEPROM/FLASH chip of this analog signal measurement apparatus at last the integral time of this voltage signal amplitude.This analog signal measurement apparatus is calculated the ratio of doing the integral time of the integral time of actual measured signal and EEPROM/F1ASH when actual measured signal, is promptly obtained the standardized data of actual measured signal.
Above-mentioned is to write automatically by PC 21 control address cards 23, directly by chip sintering manual mode parameter is write among the EEPROM (or FLASH) in addition in the prior art.Because prior art adopts craft/semi-automatic mode to realize the demarcation of analog signal measurement apparatus, need more artificial participation, comprise needing the artificial frequent wiring of the measurement of artificial visually examine's high precision measuring device number, needs, needs manually the mode of parameter by the chip sintering to be write processes such as EEPROM, therefore exist demarcate efficient low, produce difficult shortcoming in batches; Owing to too many artificial participation, cause the aspect all effecteds such as consistance of whole system operation stability, calibrating parameters simultaneously; Use under the situation that this method generally only is adapted among a small circle thus, the demarcation task is less relatively.
Summary of the invention
It is that prior art adopts semi-automatic or manual mode to carry out the correction of analog signal measurement apparatus that the present invention will solve, and exists correction rate slow, inefficient technical matters.
For addressing the above problem, the invention discloses a kind of system of automatic demarcation analog signal measurement apparatus, comprise: PC, be used to control the calibration process of the analog signal measurement apparatus of being demarcated, described PC sends configuration message earlier, and acceptance criteria value and corresponding sampled value obtain calibrating parameters then, at last described calibrating parameters is write in the described analog signal measurement apparatus, described configuration message comprises the type and the range dot information of output signal; Control card connects described PC, is used to receive described configuration message, and carries out control command that described PC issues and the described standard value that will obtain and corresponding sampled value and send it back described PC; Address card connects described control card, is used for setting up communicating to connect between calibration process control card and the described analog signal measurement apparatus; With described analog signal measurement apparatus signal source output unit one to one, connect described address card and described analog signal measurement apparatus respectively, be used for, produce standard value according to described configuration message, and be sent to described analog signal measurement apparatus, to obtain corresponding sampled value.
Described signal source output unit comprises microprocessor, reference source, measurement range selection unit, wherein: microprocessor, be connected with described address card, be used for described configuration message by receiving, control the output of described measurement range selection unit, and the standard value of described measurement range selection unit output is sent to control card by address card; Reference source is used to produce a reference signal; The measurement range selection unit is connected with described reference source with described microprocessor respectively, is used for controlling according to described microprocessor the range of described reference signal, the outputting standard value.
This signal source output unit also comprises: the channel selecting unit, be connected with described measurement range selection unit with described microprocessor respectively, and be used under the control of microprocessor, selector channel is exported described standard value.
Described PC is connected with described control card by Ethernet, so that the some address cards of described control card cascade.
Described signal source output unit comprises voltage and current signal source output unit and resistance signal source output unit.When described signal source output unit was the resistance signal source output unit, described reference source comprised the pure resistance network, and described measurement range selection unit comprises metal-oxide-semiconductor.When described signal source output unit was voltage and current signal source output unit, described reference source comprised the dedicated fiducial chip, and described measurement range selection unit comprises photoelectric isolating device.Described channel selecting unit comprises decoding scheme and channel switch.
The invention also discloses a kind of method of automatic demarcation analog signal measurement apparatus, be applied to the system of described automatic demarcation analog signal measurement apparatus, described system comprises PC, control card, address card, signal source output unit and the analog signal measurement apparatus of being demarcated, may further comprise the steps: A: described PC issues configuration message, and described configuration message comprises the type and the range dot information of data; B: described signal source output unit receives described configuration message by control card and address card, and exports the standard value of corresponding described range dot information to described analog signal measurement apparatus; C: the sampled value of measurement and described standard value correspondence on described analog signal measurement apparatus; The D:PC machine obtains calibrating parameters according to described standard value and described sampled value, and described calibrating parameters is write in the described analog signal measurement apparatus.
Be to obtain calibrating parameters among the step D by least square method or multistage polygometry.Also comprise between step C and the step D: judge in the predefined time, whether to receive described standard value and described sampled value, if carry out step D, otherwise, whether further judge unreceived number of times more than or equal to predefined number of times, if, then withdraw from, otherwise carry out steps A.
Compared with prior art, the present invention has the following advantages:
The present invention has adopted the signal source output unit of high precision high stability, is easy to integrated and access, and its IO interface meets the analog signal measurement apparatus in the industrial automation field, realizes the robotization of calibration process, and then has improved demarcation efficient; And, communicate by Ethernet between PC of the present invention and the control card, but make the some communication cards of cascade under the control card, make the demarcation of the some analog signal measurement apparatus of control card may command, and then improved the efficient of demarcating, also have, signal source output unit among the present invention adopts the channel selecting unit, switch with the hyperchannel of realizing output signal, solved a difficult problem that is difficult for batch proving operation in the previous mode, make calibration process break away from general high precision measuring device, realized that the batch in application is demarcated, timesharing is demarcated, function such as on-site proving and offset correction.Simultaneously, but prior art compare, reduced cost, reduced operation complexity, that has improved system can be handling.
Description of drawings
Fig. 1 is a theory structure synoptic diagram of analog signal measurement apparatus.
Fig. 2 is the system architecture synoptic diagram of known automatic demarcation analog signal measurement apparatus.
Fig. 3 is the process flow diagram of the automatic demarcation of analog signal measurement apparatus.
Fig. 4 is the structural representation of the system of a kind of automatic demarcation analog signal measurement apparatus of the present invention.
Fig. 5 is the structural representation that another kind of the present invention is demarcated the system of analog signal measurement apparatus automatically.
Fig. 6 is the structural representation for an embodiment of signal source output unit.
Fig. 7 is based on the demarcation process flow diagram of said system.
Fig. 8 is a kind of input modulate circuit interface principle figure of resistance signal measurement mechanism of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
See also Fig. 4, it is the structural representation of the system of a kind of automatic demarcation analog signal measurement apparatus of the present invention, and this system also comprises PC 21, control card 22, address card 23 and signal source output unit 26 except the analog signal measurement apparatus 25 of pre-demarcation.Wherein:
PC 21 is used to control the calibration process of the analog signal measurement apparatus of being demarcated, and sends configuration message earlier, and acceptance criteria value and corresponding sampled value obtain calibrating parameters then, described calibrating parameters are write in the described analog signal measurement apparatus 25 at last;
With described analog signal measurement apparatus 25 signal source output unit 26 one to one, connect described address card 23 and described analog signal measurement apparatus 25 respectively, be used for, produce standard value according to described configuration message, and be sent to described analog signal measurement apparatus 25, to obtain corresponding sampled value.
See also Fig. 5, connect by Ethernet between PC 21 and the control card 22, so that control card 22 can the some address cards 23 of cascade, and, under an address card, can level connect some analog signal measurement apparatus of being demarcated 25 and corresponding signal source output unit 26 if the model in the system of employing SUPCON is the address card (being the data forwarding card) of FW233.
See also Fig. 6, be the structural representation of an embodiment of signal source output unit.It comprises microprocessor 261, reference source 262, measurement range selection unit 263 and channel selecting unit 264, wherein:
Microprocessor 261, be connected with described address card 23, be used for controlling the output of described measurement range selection unit 263 and channel selecting unit 264, and the standard value of described measurement range selection unit 263 outputs is sent to control card 22 by address card 23 according to the described configuration message that receives;
Reference source 262 is used to produce a reference signal;
Measurement range selection unit 263 is connected with described reference source 262 with described microprocessor 261 respectively, is used for the range according to the described reference signal of described microprocessor 261 controls, the outputting standard value;
Channel selecting unit 264 is connected with described measurement range selection unit 263 with described microprocessor 261 respectively, is used under the control of microprocessor, and selector channel is exported described standard value.
Signal source output unit 26 (is UniversAlAsynchronous Receiver TrAnsmitter by the UART interface of microprocessor 261 inside, UART Universal Asynchronous Receiver Transmitter) and address card 23 carry out data interaction, obtain configuration message, this configuration message comprises information such as the type, range point of output signal, pass through the sheet choosing mouthful line of the universaling I/O port line traffic control measurement range selection unit 263 of microprocessor 261 then, also promptly realized the measurement range selection of reference signal.Also have, in order to realize the hyperchannel handoff functionality, the present invention also uses channel selecting unit 264 to carry out channel selecting output.
The signal source output unit comprises voltage and current signal source output unit and resistance signal source output unit.Wherein, voltage and current signal source output unit adopts be the 5V fiducial chip (REF102 chip) of high precision and degree of stability as reference source, and the optional photoelectric isolating device TLP521 that uses in measurement range selection unit; The channel selecting unit can be eight to select a channel switch M4051 chip or three-eight decoding schemes (74HC138 chip).
The resistance signal source output unit adopts the pure resistance network of high stability as reference source, realizes multiple range selection switching by the metal-oxide-semiconductor (IRFZ48N) with extremely low conduction impedance characteristic.And the channel selecting unit can adopt three-eight more common decoding schemes (74HC138 chip) to realize.
Voltage and current signal source output unit can be finished standard I I type, III type voltage and current signal, the fixed point output of 0～20mV signal, 0～100mV signal, 10%, 50%, 90% 3 point that generally is decided to be range can be read the standard value of output point simultaneously and also send from the memory chip of microprocessor 261.
The resistance signal source output unit is according to the convectional signals scope customization of industry spot, finish 40 Ω, 60 Ω, 80 Ω, 100 Ω, 140 Ω, 170 Ω, eight grades of resistance outputs of 250 Ω, 370 Ω, can satisfy the demarcation of thermal resistance signal such as Pt100 and Cu50 and pure resistance signal measurement apparatus.
See also Fig. 7, it is the demarcation process flow diagram based on said system.
Its demarcating steps comprises:
S210:PC machine 21 sends to control card 22 by Ethernet with configuration message and initialization data, and sets up communication by address card 23 and the analog signal measurement apparatus 25 that signal source output unit 26 and quilt are demarcated; Configuration and initialization data comprise the specific range ability at concrete measurement mechanism, specify what time to have the representational signaling point of linearization;
S220: signal source output unit 26 receives configuration and initialization data;
S230: signal source output unit 26 is according to configuration message, export some somes reference signals and give this analog signal measurement apparatus 25, analog signal measurement apparatus 25 is promptly sent PC 21 on the raw measurement data that samples, and the signal source output unit 26 of high precision gives the standard value of this signal to give PC 21 on also simultaneously;
S240: judging whether to receive data in the predefined time, then is to carry out step S250, otherwise, judge that whether unreceived number of times arrives more than or equal to predefined number of times, finishes if demarcate, otherwise carries out step S210;
S250:PC machine 21 with least square method or other method such as linearity curve of multistage polygometry simulation, is promptly tried to achieve the parameter of this linearization curve according to the sampled measurement of standard value and measurement mechanism;
S260:PC machine 21 writes the linear parameter of trying to achieve among the EEPROM of this analog signal measurement apparatus 25, finishes the parameter calibration to this measurement mechanism.
If also need demarcate next piece analog signal measurement apparatus, then repeating step 210～260.
Calibration process with the resistance signal measurement mechanism is an example below, and detailed scaling method is described, the scaling method of other signal input/output units is similar with this scaling method.
The measuring principle of resistance signal measurement mechanism is an example with the three-wire system measuring method, and its input modulate circuit interface principle as shown in Figure 8.Among the figure:
RTD＝(2*VS2-VS1)/I＝VIN/I
Wherein RTD is resistance signal to be measured, and RL is a lead resistance, and voltage VS1, VS2, VIN are benchmark ground with VSG, and constant current source is the charging current of testing resistance, and logical operation circuit is finished the computing of (2*VS2-VS1).As can be seen from the above equation, the input value of the value of testing resistance RTD and A/D change-over circuit is directly proportional, promptly and the standardized data of finally trying to achieve be directly proportional.So it satisfies the pacing items of linearization scaling method: input and output are directly proportional, this also is the basis that can realize the linear calibration.
Method for solving analysis by aforesaid linearization curve; the integral calibrating process is as follows: some signal value that resistance signal source output unit output is specific and on send standard value; by measurement mechanism to be calibrated sampling and on send the crude sampling value; at last this some signal is carried out the match of least square method; try to achieve this linear relationship curve: Y=KX+B, the K of curve, B value are finally write among the loss protecting storer EEPROM of this measurement mechanism.In the course of normal operation of resistance signal measurement mechanism, only need read after the A/D crude sampling value of K, B value and on-site signal of this straight line, install the size that just can calculate on-site signal accurately.
Further the calibration process with the Pt100 thermal resistance signal is an example:
The resistance signal source output unit is exported 40 Ω, 170 Ω, 3 resistance signals of 370 Ω respectively when demarcating Pt100.In calibration software, after the calibration information setting is finished, PC is passed through in the order of " exporting 40 Ω signals ", control card, address card is handed down to the resistance signal source output unit, this device is in output 40 Ω signals, the standard data format of loopback 40 Ω resistance is (as 0x0fff, this standard data format is decided by the internal data definition form of measurement mechanism), synchronous signal measurement mechanism this 40 Ω signal that promptly begins to sample, and the original value (as 0x2000) that samples is passed through the communication channel loopback equally give calibration software, calibration software promptly obtains (0x2000,0x0fff) point coordinate; Same method is tried to achieve the coordinate of 2 of 170 Ω, 370 Ω.Calibration software is used the least square method algorithm and is simulated this linearization curve then, also promptly tries to achieve K, the B value of this curve, and calculates final nominal data, is handed down to the resistance signal measurement mechanism again, has promptly finished the demarcation of the Pt100 thermal resistance signal of this device.
Above-mentioned is the calibration process of resistance signal measurement mechanism, and the calibration process of the scaling method of voltage and current signal measurement mechanism and resistance signal measurement mechanism is similar, repeats no more here.
Above-mentioned disclosed be the automatic demarcation of described analog signal measurement apparatus, mainly be meant offset correction and proofread and correct, the i.e. device that transfinites for measuring accuracy, carry out the correction of parameter, it also is the elementary errors adjustment of linearization curve, its realization can with the parameter calibration similar methods, also can rule of thumb be worth directly and realize by calibration software.
Simultaneously, the signal source output unit has adopted special-purpose communication mechanism in the calibration system, has realized the timesharing calibrating function to measurement mechanism, and promptly each is to signal source output unit/can be isolated mutually on the operating process of calibration measurements device.This makes the different measuring device of demarcating different application systems in same control module become possibility, and will increase work efficiency greatly on concrete the use.
Therefore; the method of the automatic demarcation of analog signal measurement apparatus of the present invention; can realize various forms of demarcation and trimming process flexibly, as secondary demarcation, unified demarcation, read-write EEPROM data and offset correction etc., these all are considered as protection scope of the present invention.
Claims (11)
1. a system of demarcating analog signal measurement apparatus automatically is characterized in that, comprising:
PC, be used to control the calibration process of the analog signal measurement apparatus of being demarcated, described PC sends configuration message earlier, acceptance criteria value and sampled value then accordingly, obtain calibrating parameters, at last described calibrating parameters is write in the described analog signal measurement apparatus, described configuration message comprises the type and the range dot information of output signal;
Control card connects described PC, is used to receive described configuration message, and carries out control command that described PC issues and the described standard value that will obtain and corresponding sampled value and send it back described PC;
Address card connects described control card, is used for setting up communicating to connect between calibration process control card and the described analog signal measurement apparatus;
With described analog signal measurement apparatus signal source output unit one to one, connect described address card and described analog signal measurement apparatus respectively, be used for, produce standard value according to described configuration message, and be sent to described analog signal measurement apparatus, to obtain corresponding sampled value.
2. the system of automatic demarcation analog signal measurement apparatus as claimed in claim 1 is characterized in that, described signal source output unit comprises microprocessor, reference source, measurement range selection unit, wherein:
Microprocessor is connected with described address card, is used for the described configuration message by receiving, and controls the output of described measurement range selection unit, and the standard value of described measurement range selection unit output is sent to control card by address card;
Reference source is used to produce a reference signal;
The measurement range selection unit is connected with described reference source with described microprocessor respectively, is used for controlling according to described microprocessor the range of described reference signal, the outputting standard value.
3. the system of automatic demarcation analog signal measurement apparatus as claimed in claim 2 is characterized in that, also comprises:
The channel selecting unit is connected with described measurement range selection unit with described microprocessor respectively, is used under the control of microprocessor, and selector channel is exported described standard value.
4. the system of automatic demarcation analog signal measurement apparatus as claimed in claim 3 is characterized in that, described PC is connected with described control card by Ethernet, so that the some address cards of described control card cascade.
5. as the system of claim 2 or 3 described automatic demarcation analog signal measurement apparatus, it is characterized in that described signal source output unit comprises voltage and current signal source output unit and resistance signal source output unit.
6. the system of automatic demarcation analog signal measurement apparatus as claimed in claim 4 is characterized in that, when described signal source output unit was the resistance signal source output unit, described reference source comprised the pure resistance network, and described measurement range selection unit comprises metal-oxide-semiconductor.
7. the system of automatic demarcation analog signal measurement apparatus as claimed in claim 4, it is characterized in that, when described signal source output unit was voltage and current signal source output unit, described reference source comprised the dedicated fiducial chip, and described measurement range selection unit comprises photoelectric isolating device.
8. as the system of claim 6 or 7 described automatic demarcation analog signal measurement apparatus, it is characterized in that described channel selecting unit comprises decoding scheme and channel switch.
9. method of automatically demarcating analog signal measurement apparatus, be applied to the system of described automatic demarcation analog signal measurement apparatus, described system comprises PC, control card, address card, signal source output unit and the analog signal measurement apparatus of being demarcated, and it is characterized in that, may further comprise the steps:
A: described PC issues configuration message, and described configuration message comprises the type and the range dot information of data;
B: described signal source output unit receives described configuration message by control card and address card, and exports the standard value of corresponding described range dot information to described analog signal measurement apparatus;
C: the sampled value of measurement and described standard value correspondence on described analog signal measurement apparatus;
The D:PC machine obtains calibrating parameters according to described standard value and described sampled value, and described calibrating parameters is write in the described analog signal measurement apparatus.
10. the method for automatic demarcation analog signal measurement apparatus as claimed in claim 9 is characterized in that, among the step D is to obtain calibrating parameters by least square method or multistage polygometry.
11. the method for automatic demarcation analog signal measurement apparatus as claimed in claim 9 is characterized in that, also comprises between step C and the step D:
Whether judgement receives that in the predefined time described standard value and institute reach sampled value, if, carry out step D, otherwise, whether further judge unreceived number of times more than or equal to predefined number of times, if then withdraw from, otherwise carry out steps A.
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| US20020053898A1 (en) * | 2000-09-18 | 2002-05-09 | Vahe Ademian | Multiport automatic calibration device for a multiport test system |
| US20030151415A1 (en) * | 2001-09-25 | 2003-08-14 | Randall Bruce E. | Self-calibrating electricity meter |
| CN1475812A (en) * | 2003-06-28 | 2004-02-18 | 浙江浙大中控技术有限公司 | Device for automatic correcting measuring module |
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| CN1595311A (en) | 2005-03-16 |
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