CN101236220A - System and method for testing jiggle contact resistance - Google Patents
System and method for testing jiggle contact resistance Download PDFInfo
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- CN101236220A CN101236220A CNA2008100074029A CN200810007402A CN101236220A CN 101236220 A CN101236220 A CN 101236220A CN A2008100074029 A CNA2008100074029 A CN A2008100074029A CN 200810007402 A CN200810007402 A CN 200810007402A CN 101236220 A CN101236220 A CN 101236220A
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Abstract
The invention discloses a system and a method of testing a micromotion contact resistance. The system comprises a microchecker unit, a micromotion contact resistance test unit, a data acquisition unit and a computer unit. The method has the following steps that a test micromotion contact resistance system is started for initialization, and the micromotion and control command parameter information is set in the computer unit and sent to the microchecker unit; the microchecker unit carries out micromotion according to the received micromotion and control command parameter information and adjusts the micromotion amplitude according to the self-formed micromotion feedback information; the micromotion contact resistance test unit carries out contact resistance test for a connector contact pair in micromotion, and the data acquisition unit samples the contact voltage signal and outputs the sampled signal to the computer unit for data storage, processing and graphic display. The system and the method of measuring a micromotion contact resistance are capable of regulating and controlling test parameters according to requirements, widening the test channel of the micromotion contact resistance and improving the accuracy of micromotion contact resistance test.
Description
Technical field
The present invention relates to low-voltage electrical apparatus connector contact resistance measuring technology, particularly a kind of system and method for testing jiggle contact resistance.
Background technology
In communication system or the electrical power transmission system, exist a large amount of electrical connection links, owing to be subjected to the external environment factor, for example impact, collision, vibration, the influence of cold cycling etc., the contact that electrically contacts that may cause connector produces small relatively change in location (fine motion), make the connector surface abrasion, the chip that wearing and tearing produce is exposed in the atmosphere, oxidation forms the oxidation film layer of insulation, remain on the electric interface, thereby influence the electrical contact performance of connector, cause the contact resistance value of connector to raise even open circuit, this connector contact causes that owing to fine motion takes place the phenomenon of contact fault is called fine motion and lost efficacy, and the fine motion Failure Mechanism is mainly fretting corrosion.
Because the mechanism that fine motion forms is bordering on microphenomenon and relevant with many factors, for example, the vibration of the corrosive gas in the atmosphere, contact interface material and surface topography thereof, chemistry and physical features, electromagnetic interference (EMI), surrounding environment and impact etc., theoretical analysis is difficult to draw conclusion accurately.Therefore assessment, the function life-span of this index of electric connector are predicted so that in the malfunction analysis procedure, laboratory simulation is present internationally recognized effective means.Jiggle contact resistance is as weighing the important indicator that fine motion was lost efficacy, and dynamically reproduced the variation of contact resistance in the fine motion process and to the electrical contact performance effect, is to analyze and the key parameter of research fine motion.
Electrically contacting the field, particularly for the communication low voltage connector, the contact pressure that adopts is less, but wider range that contact pressure changes, to gram forces up to a hundred, the amplitude of fine motion does not wait from several microns to the hundreds of micron yet from several gram forces, the cycle of fine motion generally all long (frequency is low), electrically contacting right fine motion inefficacy is wearing and tearing and environmental corrosion and the coefficient result of fretting fatigue, and the required time was long because fine motion is lost efficacy.Thereby in research and analysis, the method that often adopts the laboratory to quicken simulation is quickened the process of connector fine motion, and the simulation fine motion was lost efficacy.
The jiggle contact resistance test macro is the experimental provision that quickens simulation connector fine motion phenomenon, generally electrically contact right relative motion by the control linkage device, quicken the process of simulation connector fine motion, right contact resistance value and the automatic record of contact in the testing jiggle process, the observation fine motion is to the influence of electrical contact performance.
Fig. 1 is existing jiggle contact resistance test system structure synoptic diagram.As shown in Figure 1, comprise jiggle contact resistance test cell 11, data acquisition unit 12, pedestal 13, computer unit 14 and micropositioner unit 15.Wherein,
Jiggle contact resistance test cell 11 comprises test contact 111, test sample 112, voltmeter 113, constant current source 114, reaches contact pressure governor motion 115.
Constant current source 114 first ends link to each other with test contact 111, and second end links to each other with test sample 112; Test contact 111 offsides that voltmeter 113 first ends link to each other with constant current source 114 link to each other, test sample 112 offsides that second end links to each other with constant current source 114 link to each other, the connecting circuit that connects and composes four-point method between constant current source 114, test contact 111, test sample 112 and the voltmeter 113;
Test sample 112 is fixed or is sticked on 15 surfaces, micropositioner unit, and test contact 111 contacts with test sample 112 and forms test access in the test;
Data acquisition unit 12 is used for the voltage drop (U of test contact 111 with test sample 112 two ends
t) sampling exports computer unit 14 to;
Pedestal 13 is used to support jiggle contact resistance test cell 11 and micropositioner unit 15, and regulating system is in horizontality, the influence that isolation environment vibration, impact are tested jiggle contact resistance;
Micropositioner unit 15, the fine motion that is used for sending according to computer unit 14 is instructed, and produces fine motion, comprises: micropositioner 151, sample piece fixed station 152 and driving and controller 153;
Test sample 112 is fixed on the sample piece fixed station 152, sample piece fixed station 152 is connected with micropositioner 151, with micropositioner 251 fine motions, micropositioner 151 is by driving and controller 153 controls, carry out the fine motion of single direction, drive with controller 153 and drive micropositioner 151 fine motions by the steering order that computer unit 14 sends, test contact 111 keeps in touch with test sample 112 in test, fixing by pedestal 13, not with micropositioner 151 fine motions, by the contact pressure size of regulating action on test contact 111, for example, by on test contact 111, adding the method for counterweight, carry out the jiggle contact resistance test under the different contact pressures.
The jiggle contact resistance method of testing adopts classical ohm theorem and four-point method, and the output current of regulating constant current source 114 in advance is normal value I
c, in the fine motion process, data acquisition unit 12 is by the voltage drop (U to voltmeter 113
t) sampling exports computer unit 14 to, then can be calculated the jiggle contact resistance R of test contact 111 and test sample 112 contact positions under certain contact pressure F by the program set by ohm theorem
c=U
t/ I
c, the size of adjusting contact pressure F can obtain each jiggle contact resistance resistance under the different contact pressure F.
But there are the following problems for above-mentioned jiggle contact resistance test macro:
1. micropositioner fine motion amplitude fluctuations is big, the control out of true.In above-mentioned system, the fine motion amplitude of setting is 30 microns, and in actual motion, micropositioner fine motion amplitude fluctuates in 30～120 micrometer ranges, the control out of true.
2. micropositioner fine motion amplitude is non-adjustable.Existing jiggle contact resistance test macro can only carry out the fine motion of the single value of tentering really, and in actual applications, need carry out jiggle contact resistance test and analysis to the fine motion of different amplitudes.
3. the jiggle contact resistance measuring accuracy is lower.Because the factors such as fine motion frequency, fine motion amplitude, contact pressure, contact current and humiture in the actual motion environment all will influence the measuring accuracy of jiggle contact resistance, the normal contact resistance of connector generally has only several milliohms, and the connector connector in the mobile electronic device especially, its working current is tens milliamperes, under working current, the contact drop of connector has only tens microvolts, and, because environment and interference of noise, be easy to make the fluctuation of voltmeter reading, cause measuring inaccurate.
4. Ce Shi port number is limited.Existing jiggle contact resistance test macro has only a passage, can only be to a connector contact to quickening the fine motion simulated experiment, and conventional efficient is low, is unfavorable for comparing simultaneously the Real Time Observation analysis of test.
Summary of the invention
In view of this, a fundamental purpose of the present invention is to provide a kind of system of testing jiggle contact resistance, improves the precision that contact resistance is tested automatically in the fine motion process.
Another object of the present invention is to provide a kind of method of testing jiggle contact resistance, realize contact resistance high precision automatic testing in the fine motion process.
Be first aspect that achieves the above object, the invention provides a kind of system of testing jiggle contact resistance, comprising: micropositioner unit, jiggle contact resistance test cell, data acquisition unit and computer unit,
The micropositioner unit is used for the fine motion and the steering order of sending according to computer unit, produces fine motion, and according to the feedback fine motion amplitude information that self forms, the fine motion amplitude is regulated;
The jiggle contact resistance test cell is used for the connector contact of fine motion is tested carrying out dynamic contact resistance;
Data acquisition unit is used for the butt joint electric shock and compresses into the row sampling, exports sampled signal to computer unit and carries out data processing and graphic presentation;
Computer unit, be used for testing jiggle contact resistance is set fine motion parameter and controlled variable, export fine motion and steering order by the serial communication mode to micropositioner, the fine motion of control micropositioner, the initialization test system, undertaken reading the touch voltage signal of gathering in the capture card alternately by pci bus and capture card, handle.
Preferably, described micropositioner unit comprises: micropositioner, sample piece fixed station, driving and controller and ultramagnifier,
Micropositioner is used to receive the fine motion voltage signal that drives with controller output, carries out fine motion;
Sample piece fixed station is used for fixing test sample, with described micropositioner fine motion;
Drive and controller, be used for fine motion and steering order that computer unit is sent, be converted to the fine motion voltage signal, export to micropositioner, drive micropositioner and carry out fine motion, receive the micropositioner fine motion amplitude information of ultramagnifier feedback, the fine motion voltage signal of output is adjusted;
Ultramagnifier is used to detect the fine motion amplitude information of micropositioner, the fine motion amplitude information is fed back to drive and controller.
Preferably, described driving and controller comprise: input/output module, and control detection module and driver module,
Input/output module is used for communicating with computer unit, and fine motion that the receiving computer unit sends and steering order or the steering order that drives with controller is set are sent to the control detection module;
The control detection module is used to receive fine motion instruction and the steering order that input/output module is sent, and is converted to analog voltage signal, exports to driver module;
Driver module is used for the analog voltage signal of control detection module output is converted to the drive voltage signal that drives micropositioner, by the computational calculation power amplifying circuit of self, drives the micropositioner fine motion.
Preferably, described control detection module and driver module adopt displacement open loop control mode or displacement close-loop control mode that fine motion is controlled.
Preferably, described driving and controller comprise: simulation proportional integral regulating circuit module,
Described simulation proportional integral regulating circuit module is used for the error between output voltage signal and input voltage signal is carried out temporal integration, regulates the output voltage signal that drives with controller.
Preferably, described fine motion and steering order comprise: fine motion test parameter information, voltage parameter information and fine motion amplitude parameter information.
Preferably, described jiggle contact resistance test cell comprises: test contact, test sample, constant current source, voltage are taken into account the contact pressure regulator,
Test sample is fixed on the sample piece fixed station, in the test point both sides, inserts constant current source and voltmeter second end respectively by extension line;
Test contact is fixed on the base supports frame, and it is right to contact the formation contact with test sample by linear bearing and clip vertical, in the test point both sides, inserts constant current source and voltmeter first end respectively by extension line;
Constant current source is used to provide predetermined current, and first end links to each other with test contact, and second end links to each other with test sample, according to the steady current of experiment needs output test circuit;
Voltmeter exports data acquisition unit to after being used for the voltage drop at test contact and test sample two ends measured, and first end links to each other with the test contact opposite side, and second end links to each other with the test sample opposite side;
The contact pressure regulator is used for test contact is applied predetermined contact pressure and contact pressure is regulated.
Preferably, described contact pressure regulator comprises the contact pressure ultramagnifier,
Described contact pressure ultramagnifier is used for the contact pressure that applies is fed back, and the contact pressure regulator is regulated contact pressure according to the contact pressure information of feedback.
Preferably, described constant current source comprises the voltage-limiting protection module,
Described voltage-limiting protection module is used for constant current source is carried out voltage-limiting protection, when the constant current source constant current is exported, if output voltage reaches voltage limiting value, constant current source is automatically brought to voltage limiting value output.
Preferably, described data acquisition unit comprises multimedia timer,
Described multimedia timer is used for regularly triggering the thread dispatching call back function, carries out data acquisition and fine motion control.
Be another aspect that achieves the above object, the invention provides a kind of method of testing jiggle contact resistance, this method comprises:
A1. start the testing jiggle contact resistance system, carry out initialization, computer unit fine motion and steering order parameter information are set, send to the micropositioner unit;
A2. the micropositioner unit carries out fine motion according to the fine motion and the steering order parameter information that receive, and according to the feedback fine motion amplitude information that self forms, the fine motion amplitude is regulated;
A3. to carrying out the contact resistance test, sample to the touch voltage signal, exports sampled signal to computer unit and carry out data storage, processing and graphic presentation by data acquisition unit to the contact of the connector in the fine motion for the jiggle contact resistance test cell.
Preferably, steps A 1 is described carries out initialization and comprises:
Determine the port number of system, connect the circuit connection of respective channel in the system, by the contact pressure regulator contact pressure is applied on the test contact and to its size and regulates, regulate the constant current source output current respectively, the serial communication baud rate is set, drives with controller parameter and detect.
Preferably, steps A 3 described data acquisition units are sampled to the touch voltage signal and are comprised:
Host computer sends the distance of specifying in fine motion and the steering order between the sampled point, and data acquisition unit obtains the sampling time according to sampled distance and sampling number, and the touch voltage signal is sampled; Perhaps, when driving with the motion of controller control micropositioner, data acquisition unit reads the touch voltage signal at interval according to preset time.
Preferably, described steps A 3 further comprises:
Create the thread of the micropositioner driving of every road and controller and data acquisition, for every road micropositioner is provided with a thread and a multimedia timer, timer regularly triggers the thread operation, thread controlling and driving and controller, drive and adjust the micropositioner fine motion, the touch voltage signal is sampled and stored and send drawing message to computer unit, and computer unit carries out graphic presentation according to drawing message.
As seen from the above technical solutions, the system and method for testing jiggle contact resistance provided by the invention, by driving and two micropositioner fine motions of control module control, microstroke is adjustable continuously in 0-200 μ m, simultaneously according to the micropositioner fine motion amplitude information that feeds back, adjust the fine motion of micropositioner, its fine motion reorientation precision＜+/-2 μ m has reduced the fine motion amplitude fluctuations; Print is fixed on the micromotion platform, and contact contacts the formation contact by linear bearing and clip vertical with print right, and boosting mechanism is applied to contact pressure on the contact, has improved the degree of accuracy of contact pressure; Constant current source offers contact to constant electric current, data collecting card in the voltmeter is gathered the touch voltage between print and contact, be sent to computing machine by peripheral component interconnect (PCI, Peripheral Component Interconnect) bus, have high resolving power and high sampling precision; Computing machine is handled and is saved in sampled data on the disk, can obtain contact resistance numerical value in the fine motion process in real time, has improved the precision of jiggle contact resistance test, and its measuring accuracy can reach 1m Ω; And, can regulate control to fine motion amplitude, fine motion frequency, contact pressure parameter according to the experiment needs; Expand the test channel of jiggle contact resistance, in addition, also can carry out eight pairs of right jiggle contact resistance dynamic tests of connector contact simultaneously, improved conventional efficient, helped the Real Time Observation analysis of contrast test.
Description of drawings
Fig. 1 is existing jiggle contact resistance test system structure synoptic diagram.
Fig. 2 is the system architecture synoptic diagram of embodiment of the invention testing jiggle contact resistance.
Fig. 3 is the method flow synoptic diagram of embodiment of the invention testing jiggle contact resistance.
Fig. 4 is the method idiographic flow synoptic diagram of embodiment of the invention testing jiggle contact resistance.
Fig. 5 is the thread schematic flow sheet of embodiment of the invention testing jiggle contact resistance.
Embodiment
The present invention is by computer installation fine motion parameter, parameter instruction is sent to driving and control module, driving and control module are according to two micromotion platform fine motions of instruction control, print is fixed on the micromotion platform, contact contacts the formation contact by linear bearing and clip vertical with print right, boosting mechanism is applied to contact pressure on the contact, constant current source offers contact to constant electric current, data collecting card in the voltmeter is gathered the touch voltage between print and contact, is sent to computing machine by pci bus; Computing machine is handled and is saved on the disk sampled data.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 2 is the system architecture synoptic diagram of embodiment of the invention testing jiggle contact resistance.As shown in Figure 2, this system comprises: jiggle contact resistance test cell 21, data acquisition unit 22, pedestal 23, computer unit 24 and micropositioner unit 25.Each unit is described below:
Micropositioner unit 25, be used for the fine motion and the steering order of sending according to computer unit 24, produce corresponding fine motion, and according to the feedback fine motion amplitude information that self forms, the fine motion amplitude is regulated, comprise: micropositioner 251, sample piece fixed station 252, driving and controller 253 and ultramagnifier 254;
Micropositioner 251, the sinking support that adopts piezoelectric/electrostrictive porcelain to drive, according to driving the fine motion voltage signal of exporting with controller 253, do periodically fine motion, the micropositioner surface is provided with 8 sample piece fixed stations 251,4 screws are offered on each sample piece fixed station 251 surface, are used for fixing test sample, can select to carry out simultaneously 1 the road or multichannel (≤8) jiggle contact resistance test;
Sample piece fixed station 252 is fixed in test sample in 4 screws on the micropositioner 251, with micropositioner 251 fine motions by 4 bolts and pad;
Drive and controller 253, the fine motion that is used for computer unit 24 is sent is instructed, be converted to the fine motion voltage signal, to micropositioner 251 outputs, drive micropositioner 251 and carry out fine motion, receive the micropositioner 251 fine motion amplitude informations of ultramagnifier 254 feedbacks, the fine motion voltage of output is adjusted, comprise input/output module 255, control detection module 256 and driver module 257.
Input/output module 255 adopts the serial communication mode, communicates with computer unit 24, and fine motion that receiving computer unit 24 sends and steering order are sent to control detection module 256; Or the steering order that drives with controller 253 is set, be sent to control detection module 256.
In the practical application, can also pass through serial communication function, be realized that by computer software the operation of driving and controller 253 is controlled, the operation steering order that receiving computer unit 24 sends is sent to control detection module 256.
Control detection module 256 is used to receive fine motion instruction and the steering order that input/output module 255 is sent, and is converted to the high-precision analog voltage signal, to driver module 257 outputs;
Carry fine motion test parameter, voltage parameter and displacement parameter information in the fine motion instruction.
Driver module 257 is used for the analog voltage signal of control detection module 256 outputs is converted to the drive voltage signal that drives micropositioner 251, by the computational calculation power amplifying circuit of self, drives micropositioner 251 fine motions.
In the practical application, control detection module 256 and driver module 257 adopt the displacement open loop control mode that fine motion is controlled, and also can adopt the displacement close-loop control mode that fine motion is controlled.
Under the displacement open loop control mode state, input parameter is an input voltage, by serial communication mode input voltage parameter, and high-precision analog voltage of control detection module 256 outputs, for example, 16 precision signals; Driver module 257 converts this high-precision analog voltage signal the driving voltage of micropositioner 251 to, and outputs to micropositioner 251 by the computational calculation power amplifying circuit; Ultramagnifier 254 detects the output voltage of micropositioner 251, feeds back to drive and controller 253, drives and the voltage signal of controller 253 according to this feedback, output voltage is regulated, until having reached desired voltage parameter.
Under the displacement closed loop state, input parameter is imported displacement parameter for the input displacement by the serial communication mode, control detection module 256 an output high-precision analog voltage (16 precision) signals; Driver module 257 converts this high-precision analog voltage signal the driving voltage of micropositioner 251 to, and outputs to micropositioner 251 by the computational calculation power amplifying circuit; Ultramagnifier 254 detects micropositioner 251 displacements by displacement transducer and forms the Displacement Feedback signal, feed back to and drive and controller 253, drive and the corresponding relation of controller 253 according to the displacement information of feedback and Displacement Feedback that sets in advance and output displacement, for example, setting in advance the Displacement Feedback signal and exporting displacement is linear relationship, adjust output voltage signal, until having reached desired displacement parameter.
In the practical application, drive and the dynamic frequency response of controller 253 and the stability of assurance output parameter in order to improve, can also adopt simulation proportional integral (PI) regulating circuit, because it is above-mentioned when carrying out proportional control, there is steady-state error (Steady-state error) in system output, and the output of steady-state error and driving and controller 253 and error originated from input be integrated into proportional relation.In order to eliminate above-mentioned steady-state error, in driving and controller 253, further introduce " integral " (I), just adopt simulation proportional integral regulating circuit, integral is carried out temporal integration to the error between output voltage signal and input voltage signal, along with the increase of time, the value of integral increases gradually.Like this, even if error is very little, integral also can increase along with the increase of time, like this, by regulating driving with the output of controller 253, steady-state error is reduced gradually, up to no steady-state error.
The drive voltage signal of the driving micropositioner 251 of driver module 257 outputs, pass through serial communication protocol, can be to send the driving voltage instruction continuously, behind the motion preset distance, ultramagnifier 254 is just gathered the voltage drop at test contact and test sample two ends, feed back to driver module 257, driver module 257 is regulated output voltage according to the voltage drop size of gathering; Also can be that amplitude, frequency and run duration with periodic motion sends to micropositioner 251, the motion of control micropositioner 251, ultramagnifier 254 is every the voltage drop at test contact of preset time collection and test sample two ends, feed back to driver module 257, driver module 257 is regulated output voltage according to the voltage drop size of gathering.
Ultramagnifier 254 is used to detect the fine motion amplitude information of micropositioner 251, the fine motion amplitude information is fed back to drive and controller 253, and the fine motion amplitude of micropositioner 251 is adjusted.
In the practical application, the actual displacement that can go out micropositioner 251 by the accurate small-sized displacement sensor that is installed on the micropositioner 251, displacement information is fed back to driving and controller 253, drive and the linear relationship of controller 253 according to the displacement information of feedback and Displacement Feedback that sets in advance and output displacement, in the present embodiment, by the polarization intensity of piezoelectric ceramics in the adjustment micropositioner 251, thus the displacement closed loop adjustment and the control of realization micropositioner 251.
Jiggle contact resistance test cell 21 is used for the connector contact of fine motion is tested carrying out dynamic contact resistance, comprises test contact 211, test sample 212, constant current source 213, voltmeter 214 and contact pressure regulator 215.
Test sample 212, by with piezoelectric ceramics micropositioner 251 on bolt on 4 screws and the sample piece fixed station 252 and spacers on sample piece fixed station 252, in the test point both sides, draw by lead, insert constant current source 213 and voltmeter 214 second ends respectively;
Test contact 211, be fixed on the bracing frame of pedestal 23, form dismountable fixedly connected, it is right to contact the formation contact with test sample 212 by linear bearing and clip vertical, in the test point both sides, draw by lead, insert constant current source 213 and voltmeter 214 first ends respectively, form four-point method with test sample 212 and be connected, contact pressure regulator 215 is applied to contact pressure on the test contact 211 and to its size and regulates;
Constant current source 213, be used to provide predetermined current, first end links to each other with test contact 211, second end links to each other with test sample 212, be used for steady current according to experiment needs output test circuit, for example, in the present embodiment, because the system applies of testing jiggle contact resistance is in the communications field, the electric current of constant current source 213 outputs can not be too big, in order to avoid puncture the surface contamination rete that connector forms in environment for use, generally should be no more than 100 milliamperes (mA), and be provided with voltage-limiting protection, promptly under constant current output situation, if output voltage reaches voltage limiting value, constant current source will be automatically brought to constant voltage (voltage limiting value) output;
Contact pressure regulator 215 is used for according to the experiment needs test contact 211 being applied predetermined contact pressure.
In the practical application, can realize applying and adjusting of contact pressure, utilize the gravity of counterweight self that test contact 211 is applied contact pressure by counterweight and linear bearing; Also print can be installed on the weighing and force-measuring transducer, directly contact pressure be tested, and contact pressure is presented on the computer unit 24, guarantee the accuracy that contact pressure loads; Can also be that the contact pressure ultramagnifier further is set, the contact pressure that applies is fed back that the contact pressure regulator is regulated contact pressure according to the contact pressure information of feedback.
Pedestal 23 is used to support jiggle contact resistance test cell 21 and micropositioner unit 25, and regulating system is in horizontality, the influence that isolation environment vibration, impact are tested jiggle contact resistance;
Data acquisition unit 22 is used for the voltage that the voltmeter 214 of one or more passages is exported is carried out two-forty and sampling with high precision, exports sampled signal to computer unit 24 and carries out data processing and graphic presentation;
In the practical application, output voltage to voltmeter 214, the sampling of touch voltage just, mode according to the micropositioner motion, two kinds of method of samplings are arranged: when a kind of method is host computer transmission fine motion and steering order, specify the distance between the sampled point, obtain the sampling time according to sampled distance and sampling number; Another kind method is that capture card reads the touch voltage signal at interval according to preset time when driving with the motion of controller control micropositioner.Capture card can interrupt gathering the sampled signal data by the timing of software or hardware, as the timing of adopting hardware is when interrupting gathering the sampled signal data, at data acquisition unit 22 built-in multimedia timers (Multimedia Timer), by using independent thread (Thread) to call oneself a call back function (Callback Function), send a message at regular intervals and interrupt gathering the sampled signal data.
The data acquisition module of program can be according to the characteristic of fine motion such as sample frequency, the sampling interval of parameter setting capture cards such as fine motion cycle, fine motion amplitude and fine motion step pitch; Also can set the range of capture card and the interval of setting neighbouring sample point according to the contact resistance behavior of specimen.
In addition, when adopting eight lane testing jiggle contact resistances, because the rate request of eight channel voltage measure portion is very fast, for example, pressing ten sampled points of one-period calculates, sampling rate need reach 10kHz, and because the accuracy requirement of gathering need reach the order of magnitude of microvolt, like this, in order to satisfy the real-time index of instrument simultaneously, require the speed of data transmission very high, therefore, in the present embodiment, that adopts difference measurement has 18 acquisition precisions capture card of (being equivalent to 5 half voltmeter), the hyperchannel interval scan of this capture card (interval scanning) speed can reach 500KS/S, per second 500K sampled point just, and capture card can directly insert in the PCI slot of computer unit 24.
Computer unit 24, be used for jiggle contact resistance testing setup fine motion parameter and controlled variable, for example, the fine motion amplitude, the fine motion frequency, the fine motion number of times, sampling channel, sample frequency and sampling number, export micropositioner fine motion parameter and controlled variable by the serial communication mode, the fine motion of control micropositioner, undertaken alternately by pci bus and capture card, the sampled signal of gathering is sent to computer unit 24, the initialization test system, voltage signal according to data acquisition unit 22 is gathered carries out conversion, and the data file after the conversion is carried out record, and going out the jiggle contact resistance change curve according to the software program real-time rendering of this data file and setting, the contact resistance in the reflection fine motion process changes.
In the practical application, can also carry out subsequent treatment by the data file of record.
To carry out two lane testing jiggle contact resistances is example, and the principle of work of system shown in Figure 2 is:
The port number of determining system is two, connect the circuit connection of two passages in the said system according to requirement of experiment, by contact pressure regulator 215 contact pressure is applied on the test contact 211 and to its size and regulates, regulate respectively that constant current source 213 output currents are predetermined value in two passages, start the testing jiggle contact resistance system, carry out system initialization, enter the jiggle contact resistance testing software interface in the computer unit 24, the fine motion amplitude is set respectively, the fine motion frequency, the fine motion number of times, sampling channel, test such as sample frequency and sampling number correlation parameter, to be correlated with fine motion and control test parameter of computer unit 24 adopts the serial communication mode to export input/output module 255 to, input/output module 255 sends test parameter to control detection module 256, control detection module 256 acceptance test parameters, test parameter is converted to the high-precision analog voltage signal, to driver module 257 outputs, driver module 257 receives analog voltage signal, be converted to the driving voltage of micropositioner 251, and by 251 fine motions of computational calculation power amplifying circuit driving micropositioner, ultramagnifier 254 is by the actual displacement of accurate small-sized displacement sensor micropositioner 251, displacement information is fed back to driving and controller 253, drive the polarization intensity of adjusting piezoelectric ceramics according to displacement information and the Displacement Feedback that sets in advance and the corresponding relation of exporting displacement of feedback with controller 253, the fine motion amplitude of micropositioner 251 is adjusted.
Connector contact in 21 pairs of fine motions of jiggle contact resistance test cell is to carrying out the dynamic contact resistance test, export test data to data acquisition unit 22,22 pairs of test datas of data acquisition unit are carried out two-forty and sampling with high precision, export sampled signal to computer unit 24 and carry out data storage, processing and graphic presentation, obtain jiggle contact resistance information.
As seen from the above-described embodiment, because control detection module 256 can be with the fine motion correlation parameter of computer unit 27 outputs, being converted to the high-precision analog voltage signal exports, driver module 257 converts this high-precision analog voltage signal to the driving voltage of micropositioner 251, drive micropositioner 251 fine motions, itself has the sinking support that piezoelectric/electrostrictive porcelain drives and drive micropositioner 251, there is not the machinery friction, no gap, has very high displacement resolution, simultaneously, drive with controller 253 and can the fine motion voltage of output be adjusted according to the micropositioner 251 fine motion amplitude informations of ultramagnifier 254 feedbacks, therefore accurate to the adjusting of fine motion amplitude, its precision can reach ± 2um, greatly reduces the fine motion amplitude error; And, by adopting the high-accuracy data collection card of high-precision voltage test device, constant current source and difference input, the sampled data precision is further improved, strengthened the measuring accuracy of jiggle contact resistance.
Fig. 3 is the method flow synoptic diagram of embodiment of the invention testing jiggle contact resistance.As shown in Figure 3, this flow process comprises:
Step 301 starts the testing jiggle contact resistance system, carries out initialization, and computer unit fine motion and steering order parameter information are set, and sends to the micropositioner unit;
Fig. 4 is the method idiographic flow synoptic diagram of embodiment of the invention testing jiggle contact resistance.As shown in Figure 4, this flow process comprises:
In this step, determine the port number of system as required, connect the circuit connection of respective channel in the system according to requirement of experiment, by the contact pressure regulator contact pressure is applied on the test contact and to its size and regulates, regulate the constant current source output current respectively, start the jiggle contact resistance test macro, enter after the program main window initialization driving and controller: it is 9600 that the serial communication baud rate is set; Drive with controller parameter and detect, guarantee the correctness of each channel voltage and maximum displacement parameter, avoid damaging micropositioner.
Step 402 is provided with the fine motion parameter;
In this step, the fine motion parameter is set, following three kinds of modes can be arranged,
Positioning control: fine motion controller control knob is allocated to the open loop shelves, and what export under the open loop situations is magnitude of voltage, and each interchannel of micropositioner is independently output separately, is independent of each other;
Triangular wave waveform output control: be set to closed loop displacement output mode, what the closed loop state was exported down is shift value, four parameters of each passage are set, amplitude (A), from zero step number (n) to maximum displacement value, the time interval (t) and fine motion number of times (N) between adjacent two steps, then period T is that (2 * n * t), stride is (A ÷ n);
Sine waveform output control: be set to closed loop displacement output mode, three parameters of each passage are set, amplitude (A), cycle (T) and fine motion number of times (N).
If the fine motion parameter is selected triangular wave waveform output control or sine waveform output control, after confirming that the fine motion parameter is provided with, computing machine can calculate the point sequence that will send according to the fine motion parameter that is provided with, and stores in the array, and the maximum length of array can be made as 1000.
Step 403 is provided with acquisition parameter;
In this step, the data acquisition attribute is set: the passage of use is set, the range that the distance of two adjacent voltage sample points or the time interval and capture card use.
Step 404 is carried out the jiggle contact resistance test;
In this step, start multimedia timer, voltage signal is sampled; Create the thread of two-way micropositioner driving and controller and data acquisition; Establishment is used to store the TXT document of data, and writes the correlation parameter of experiment this time in document.
In this step, one road micropositioner is provided with a thread and a timer, and timer is responsible for regularly triggering the thread operation, and thread is responsible for controlling and driving and controller, drive and adjust the micropositioner fine motion, the touch voltage signal is sampled and stored and send drawing message to computer unit.
In the practical application, data acquisition generally is to read extraneous data by the timing interruption and the A/D conversion of software or hardware, because multimedia timer has very high priority, whether it is finished regardless of other message with regard to sending a message at regular intervals, in the present embodiment, testing software has adopted multimedia timer to realize timing controlled; In addition, for present Intel CPU, its minimum timing precision can reach 1ms usually, and the maximum fine motion frequency of micromotion platform is 1Hz, and the multimedia timer timing accuracy enough satisfies the timing accuracy of its real-time data acquisition; And, process use Memory Mapping File and its form is directly visited the data file on the disk, avoided the input and output (I/O of data file, Input/Output) operation, do not need to call the api function of those distribution, releasing memory piece and data file I/O, as long as the mobile data file pointer is read and write, owing to do not relate to actual file operation, it is higher to carry out efficient.
In this step, when experiment finishes, program will finish thread and timeing closing device automatically, and can preserve and data processing current data before this.
In the process of fine motion experiment, program is mainly finished the data acquisition and the resistance curve of fine motion control, voltage drop and is drawn three tasks, fine motion control and data acquisition are cooperated by independently thread and timer to be finished, timer regularly triggers thread and carries out data acquisition and fine motion control, and each road micropositioner distributes a thread; After the drawing message that the master routine receiving thread sends, with the drawing curve display on computer screen; In a disk file, even power down, still can preserve by data with data file for Automatic Program, sends end when thread finishes to master routine, and master routine finishes experiment after receiving message.
Process and the thread that the embodiment of the invention is related to elaborates below.
A process is normally defined an example of program, in Win32, process occupies the address space of 4GB, different with the process in MS-DOS and 16 the Windows operating system, the Win32 process does not have vigor, that is to say, a Win32 process does not execute instruction, just, the code and the data of application program EXE file are arranged in this address space, can improve the operational efficiency of large program and the stability of system in occupation of the address space of 4GB.
Except address space, process is also occupied some resource, distributes and thread such as file, Dram.When procedure termination, the various resources of creating in its lifetime will be eliminated, in order to execute the task, process must be occupied at least one thread, each thread has one group of CPU register and the storehouse of oneself, therefore, thread is to describe in-process execution, responsible execution is included in the code in the address space of process, operating system is arranged the number of C PU time for each separate threads, operating system provides timeslice with round robin to thread, and individual process can comprise several threads, and they are the code in the address space of executive process simultaneously.Each process has the code of a thread in carrying out its address space at least, if there is not the code in the thread execution process address space, system will remove process and address space thereof automatically.
All in-process threads use same 32 bit address space, and the execution of these threads is controlled by system scheduler, scheduler program determines that thread can carry out and execution thread when, thread has priority level, and the thread that right of priority is lower is carried out after must waiting until the intact task of the higher thread execution of right of priority again.On the machine of multiprocessor, scheduler program can be put into a plurality of threads on the different processors and move, and can make the task balance of processor like this, also improves the operational efficiency of system.
Fig. 5 is the thread schematic flow sheet of embodiment of the invention testing jiggle contact resistance.As shown in Figure 5, this flow process comprises:
Step 502 is obtained the thread signal;
In this step, timer triggers the thread operation, discharges the thread signal, and judges whether to carry out the sampling of touch voltage, if capture card carries out the touch voltage sampling, obtains and write down sampled data, sends drawing message then, execution in step 503; Otherwise, direct execution in step 503.
In the process of data acquisition, the data that program obtains capture card are stored and are drawn, the data of gathering have eight passages at most, way according to micropositioner is divided into two groups, and be kept at respectively in the disk file of two expansions " .txt " by name under the application program current directory, these two files can directly be opened with notepad; The curve plotting of the The data different colours of eight passages is in the same coordinate system, and in the practical application, in data acquisition period, in order to guarantee real-time, refresh function promptly repaints the curve function with disabled automatically.
When capture card collects touch voltage data, after the application program host process receives the drawing message of thread transmission, call the drawing function, drawing function line between the coordinate of the coordinate of a sampled point on each passage and this sampled point, the back that finishes of drawing finishes to call.
Step 503 is obtained rs 232 serial interface signal;
Step 504 sends displacement commands;
Step 505 discharges rs 232 serial interface signal;
In this step, after discharging rs 232 serial interface signal, program judges whether to have finished one-period, if also do not have, returns step 502; If finished one-period, then judged whether to finish predetermined periodicity again, if do not finish predetermined periodicity, return step 502, if finished predetermined periodicity, then process ends.
After test is finished, can also do further processing to image data, for example, the amplification of the maximin of the asking for of the demonstration of the convergent-divergent of drawing curve integral body, single-point touch voltage or contact resistance value, contact resistance value, this drawing curve and average, drawing curve is observed and to the smothing filtering operation of drawing curve etc., the smothing filtering of drawing curve mainly is for the ease of observing the general trend of jiggle contact resistance (voltage) curve.
More than lift preferred embodiment; the purpose, technical solutions and advantages of the present invention are further described; institute is understood that; the above only is preferred embodiment of the present invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1, a kind of system of testing jiggle contact resistance is characterized in that, this system comprises: micropositioner unit, jiggle contact resistance test cell, data acquisition unit and computer unit, wherein
The micropositioner unit is used for the fine motion and the steering order of sending according to computer unit, produces fine motion, and according to the feedback fine motion amplitude information that self forms, the fine motion amplitude is regulated;
The jiggle contact resistance test cell is used for the connector contact of fine motion is tested carrying out dynamic contact resistance;
Data acquisition unit is used for the butt joint electric shock and compresses into the row sampling, exports sampled signal to computer unit and carries out data processing and graphic presentation;
Computer unit, be used for testing jiggle contact resistance is set fine motion parameter and controlled variable, export fine motion and steering order by the serial communication mode to micropositioner, the fine motion of control micropositioner, the initialization test system, undertaken reading the touch voltage signal of gathering in the capture card alternately by pci bus and capture card, handle.
2, the system as claimed in claim 1 is characterized in that, described micropositioner unit further comprises: micropositioner, sample piece fixed station, driving and controller and ultramagnifier, wherein
Micropositioner is used to receive the fine motion voltage signal that drives with controller output, carries out fine motion;
Sample piece fixed station is used for fixing test sample, with described micropositioner fine motion;
Drive and controller, be used for fine motion and steering order that computer unit is sent, be converted to the fine motion voltage signal, export to micropositioner, drive micropositioner and carry out fine motion, receive the micropositioner fine motion amplitude information of ultramagnifier feedback, the fine motion voltage signal of output is adjusted;
Ultramagnifier is used to detect the fine motion amplitude information of micropositioner, the fine motion amplitude information is fed back to drive and controller.
3, system as claimed in claim 2 is characterized in that, described driving and controller further comprise: input/output module, and control detection module and driver module, wherein
Input/output module is used for communicating with computer unit, and fine motion that the receiving computer unit sends and steering order or the steering order that drives with controller is set are sent to the control detection module;
The control detection module is used to receive fine motion instruction and the steering order that input/output module is sent, and is converted to analog voltage signal, exports to driver module;
Driver module is used for the analog voltage signal of control detection module output is converted to the drive voltage signal that drives micropositioner, by the computational calculation power amplifying circuit of self, drives the micropositioner fine motion.
4, system as claimed in claim 3 is characterized in that, described control detection module and driver module adopt displacement open loop control mode or displacement close-loop control mode that fine motion is controlled.
5, as claim 2 or 3 described systems, it is characterized in that described driving and controller further comprise: simulation proportional integral regulating circuit module,
Described simulation proportional integral regulating circuit module is used for the error between output voltage signal and input voltage signal is carried out temporal integration, regulates the output voltage signal that drives with controller.
6, the system as claimed in claim 1 is characterized in that, described fine motion and steering order comprise: fine motion test parameter information, voltage parameter information and fine motion amplitude parameter information.
7, the system as claimed in claim 1 is characterized in that, described jiggle contact resistance test cell further comprises: test contact, test sample, constant current source, voltage are taken into account the contact pressure regulator, wherein
Test sample is fixed on the sample piece fixed station, in the test point both sides, inserts constant current source and voltmeter second end respectively by extension line;
Test contact is fixed on the base supports frame, and it is right to contact the formation contact with test sample by linear bearing and clip vertical, in the test point both sides, inserts constant current source and voltmeter first end respectively by extension line;
Constant current source is used to provide predetermined current, and first end links to each other with test contact, and second end links to each other with test sample, according to the steady current of experiment needs output test circuit;
Voltmeter exports data acquisition unit to after being used for the voltage drop at test contact and test sample two ends measured, and first end links to each other with the test contact opposite side, and second end links to each other with the test sample opposite side;
The contact pressure regulator is used for test contact is applied predetermined contact pressure and contact pressure is regulated.
8, system as claimed in claim 7 is characterized in that, described contact pressure regulator further comprises the contact pressure ultramagnifier,
Described contact pressure ultramagnifier is used for the contact pressure that applies is fed back, and the contact pressure regulator is regulated contact pressure according to the contact pressure information of feedback.
9, system as claimed in claim 7 is characterized in that, described constant current source further comprises the voltage-limiting protection module,
Described voltage-limiting protection module is used for constant current source is carried out voltage-limiting protection, when the constant current source constant current is exported, if output voltage reaches voltage limiting value, constant current source is automatically brought to voltage limiting value output.
10, the system as claimed in claim 1 is characterized in that, described data acquisition unit further comprises multimedia timer,
Described multimedia timer is used for regularly triggering the thread dispatching call back function, carries out data acquisition and fine motion control.
11, a kind of method of testing jiggle contact resistance is characterized in that, this method comprises:
A1. start the testing jiggle contact resistance system, carry out initialization, computer unit fine motion and steering order parameter information are set, send to the micropositioner unit;
A2. the micropositioner unit carries out fine motion according to the fine motion and the steering order parameter information that receive, and according to the feedback fine motion amplitude information that self forms, the fine motion amplitude is regulated;
A3. to carrying out the contact resistance test, sample to the touch voltage signal, exports sampled signal to computer unit and carry out data storage, processing and graphic presentation by data acquisition unit to the contact of the connector in the fine motion for the jiggle contact resistance test cell.
12, method as claimed in claim 11 is characterized in that, steps A 1 is described carries out initialization and comprise:
Determine the port number of system, connect the circuit connection of respective channel in the system, by the contact pressure regulator contact pressure is applied on the test contact and to its size and regulates, regulate the constant current source output current respectively, the serial communication baud rate is set, drives with controller parameter and detect.
13, method as claimed in claim 11 is characterized in that, steps A 3 described data acquisition units are sampled to the touch voltage signal and comprised:
Host computer sends the distance of specifying in fine motion and the steering order between the sampled point, and data acquisition unit obtains the sampling time according to sampled distance and sampling number, and the touch voltage signal is sampled; Perhaps, when driving with the motion of controller control micropositioner, data acquisition unit reads the touch voltage signal at interval according to preset time.
14, method as claimed in claim 11 is characterized in that, described steps A 3 further comprises:
Create the thread of the micropositioner driving of every road and controller and data acquisition, for every road micropositioner is provided with a thread and a multimedia timer, timer regularly triggers the thread operation, thread controlling and driving and controller, drive and adjust the micropositioner fine motion, the touch voltage signal is sampled and stored and send drawing message to computer unit, and computer unit carries out graphic presentation according to drawing message.
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