CN101750546B - Self-adaptive scanning device with electromagnetic compatibility for near-field test - Google Patents
Self-adaptive scanning device with electromagnetic compatibility for near-field test Download PDFInfo
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- CN101750546B CN101750546B CN200910243579A CN200910243579A CN101750546B CN 101750546 B CN101750546 B CN 101750546B CN 200910243579 A CN200910243579 A CN 200910243579A CN 200910243579 A CN200910243579 A CN 200910243579A CN 101750546 B CN101750546 B CN 101750546B
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Abstract
The invention relates to a self-adaption scanning device with electromagnetic compatibility for a near-field test, which consists of a hardware system and a scanning control software system. The hardware system comprises a computer, a spectrum analyzer, a GPIB card for communication between the computer and the spectrum analyzer, a set of near-field probe and pre-amplifier, a control circuit with a single-chip computer as the core, a USB serial cable for connection of the computer and the control circuit, two sets of stepper motor and matching transmission devices and also a three-dimensional mechanical scanning platform; the scanning control software system comprises a communication program between the computer and the spectrum analyzer, a serial communication program between the computer and the single-chip computer, a driving program for the single-chip computer to control the stepper motor, a program for analysis and display of data and a user-oriented human-computer interaction interface program. The invention has the advantages of scientific concept and novel structure, improves the scanning efficiency and the data accuracy, and has high practical value and broad application prospects in the field of testing of the near field with electromagnetic compatibility.
Description
(1) technical field
The present invention relates to a kind of self-adaptive scanning device that is used to carry out electromagnetic compatibility test; Relate in particular to a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test; This device can carry out electromagnetic scanning to electron devices such as chip, printed circuit board (PCB) (PCB), cable, cabinet and equipment; And output test result according to test data; And can use colored spatial distribution map to show electromagnetic radiation diagram intuitively, thus realize " visual " of electromagnetic radiation, help the technician and find out radiation position and carry out fault diagnosis.The invention belongs to electromagnetic compatibility near-field test field.
(2) background technology
So-called electromagnetic compatibility (Electromagnetic Compatibility, abbreviation EMC) is meant: " equipment, system can carry out the coexisting state of function separately together in common electromagnetic environment.Comprise following two aspects: when equipment, system move, can realize the serviceability of design and not impaired or produce unacceptable degradation in predetermined electromagnetic environment by the margin of safety of regulation because of electromagnetic interference (EMI); Equipment, system normally work in predetermined electromagnetic environment and bring unacceptable electromagnetic interference (EMI) can for environment (or miscellaneous equipment)." central topic of EMC studies control exactly and eliminate electromagnetic interference (EMI) (Electromagnetic Compatibility abridge EMI), comprises that electromagnetic compatibility test is technological, electromagnetic compatibility emulation technology and EMC Design.At present, EMI measures has become a qualified products whether important indicator, and country specifies special mechanism that this index is measured, and different types of product has different index requests and technical standard.Electromagnetic compatibility test comprises far field test and near-field test: the far field test is tested for the EMC standard authentication, provides frequency information but can't obtain positional information; And near-field test can the location interference source, takes corresponding measure to reduce electromagnetic interference (EMI) from the source, and it helps interference problem and the interference volume scope of diagnosing identification potential, helps to take various effective electromagnetism reinforcement measures.PCB is the generation ground of interference source, in the EMC design, occupies topmost status.In design of electronic products, along with the raising of dominant frequency, the increase of wiring density, the use of many level scheme and ground level/power plane cutting techniques exists a large amount of radiation interference between signal among the PCB, cause functions of the equipments fault or job insecurity.Simultaneously, all signals externally form very big electromagnetic radiation, make product test an obstacle that becomes listing through EMC.If it is more satisfactory just carrying out appropriate EMC design in the design initial of product, and gets twice the result with half the effort, but be limited to EMC deviser's level and many actual situation about accurately expecting of being difficult to, possibly there is problem more or less in product.Therefore, by means of certain electronic product fault diagnosis technology,, search the PCB electromagnetic interference source rapidly and just seem extremely important like near-field scan.The principle that near-field scan is measured institute's foundation is that electromagnetic radiation is that the high-frequency current on the equipment under test (DUT) forms.
In the near-field test system that is used for carrying out fault diagnosis, traditional method is that hand hold transducer formula near-field test system confirms interference source.This system is owing to adopt the hand-hold near-field probe, and the people is for causing error inevitable, and bigger time cost and the human cost of existence, so efficient and accuracy are not high.
In recent years, occur the electromagnetic compatibility scanning system on the market, improved the hand-held influence that brings of conventional artificial effectively, and on certain program, improved efficient and accuracy.This system general can be divided into two types: a kind of electromagnetic interference (EMI) scanning system that is based on aerial array, another kind are mechanical type electromagnetic compatibility scanning systems.At present, this electromagnetic compatibility scanning system product that states such as Sweden, Canada develop has received widely and having welcome.
Electromagnetic interference (EMI) scanning system (EMSCAN) based on aerial array; Hold the EMSCAN that releases to Science and Technology Ltd. of system like Canada; The scanning dull and stereotyped (scanner) that it adopts aerial array to form is mixed frequency spectrograph, computing machine, industrial computer and corresponding software again and is constituted scanning system.The advantage of this scanning system is to obtain the complete electromagnetic field information of measured object by one-shot measurement, can accurately locate electromagnetic interference source rapidly; Shortcoming is to reduce greatly for measuring accuracy and the accuracy meeting of the product of non-regular outline product or structure more complicated on the one hand, on the other hand flat-bed scanner since the employing array probe have up to 1280, so its cost is very high.
Mechanical type electromagnetic compatibility scanning system (EMC Scanner); EMCScanner like the release of Sweden Detectus company; It adopts the mode of single probe motion scan to gather electromagnetic field value information; And configuration drives support, three-dimensional machinery scanning platform that probe moves, the power control system of support scanning, frequency spectrograph, computing machine and corresponding software kit.Because it can keep relative distance constant with the measured object outline, thus relatively accurate for non-regular outline product and structure than the measurement meeting of complex product, and because the probe use is less, cost is lower with respect to the array antenna scanner.But it all is the stepping length conduct with fixing that the mechanical scanner that exists is on the market popped one's head in operational process, and in operational process, can not change.Like this, when initial stepping length is provided with smallerly, and if in scanning process a certain regional electromagnetic radiation value change when little, can cause unnecessary scanning, cause temporal waste.In addition, the adaptive step-length of advancing helps to be positioned at apace on the zone of deviser's care, and the self-adaptive scanning device of the present invention's design has solved this problem effectively.
(3) summary of the invention
1, purpose: the object of the present invention is to provide a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test; It can fast and search electromagnetic interference source on the measured objects such as getting rid of location PCB effectively, so that the technician takes measures to guarantee the correctness and the reliability of design of electronic products.
The principle of the present invention's design is to utilize a near field probes (comprising electric field probe and magnet field probe) of in three dimension system, accurately moving; Electromagnetic field on the measured objects such as induction PCB distributes; Obtain this electromagnetic field information and send computing machine to through spectrum analyzer; Plot the spatial distribution map of electromagnetic field, be mapped to then on the circuit module of the particular location on the PCB, to seek the EMI source.
2, technical scheme: a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test of the present invention, this device is made up of hardware system and scan control software systems two parts.
See Fig. 1, hardware system comprises: GPIB (General Purpose for Interface Bus) card (hereinafter to be referred as the GPIB card), the near field probes that computing machine, spectrum analyzer, computing machine and spectrum analyzer are communicated by letter be the control core circuit with prime amplifier, with the single-chip microcomputer, be connected USB-Serial Port Line (hereinafter to be referred as the USB-Serial Port Line), stepper motor and the supporting gearing and the three-dimensional machinery scanning platform of computing machine and control circuit.Position and annexation between them are: this computing machine links through GPIB and receives on the spectrum analyzer; The input end of this spectrum analyzer is connected on the near field probes through prime amplifier, and this near field probes is fixed on the three-dimensional traversing carriage of three-dimensional machinery scanning platform; It is the control core circuit that this computing machine is connected to the single-chip microcomputer through the USB-Serial Port Line; Should be with the single-chip microcomputer for the control core circuit connect stepper motor and supporting gearing, this stepper motor and supporting gearing connect and the three-dimensional traversing carriage of control three-dimensional machinery scanning platform moves.Should be built in the three-dimensional machinery scanning platform for the control core circuit with the single-chip microcomputer; One cover stepper motor and supporting gearing are built in the three-dimensional machinery scanning platform; Another set of stepper motor and supporting gearing; Its gearing is built in the three-dimensional machinery scanning platform, and stepper motor exposes.
Wherein, this number of computers is 1;
Wherein, this spectrum analyzer quantity is 1;
Wherein, this computing machine GPIB card of communicating by letter with spectrum analyzer is 1;
Wherein, this near field probes and prime amplifier quantity are a cover;
Wherein, should be with the single-chip microcomputer be one for the control core circuit quantity;
Wherein, the USB-Serial Port Line quantity of this connection computing machine and control circuit is one;
Wherein, this stepper motor and supporting gearing quantity are two covers;
Wherein, this three-dimensional machinery scanning platform quantity is one.
Said computing machine is: family's desktop computer of Dell, adopt Windows XP system.This computing machine links through GPIB on the one hand and receives on the spectrum analyzer, and being connected to the single-chip microcomputer through the USB-Serial Port Line on the other hand is the control core circuit.This computing machine is the maincenter of system's control, data processing and demonstration.Communicate by letter with frequency spectrograph on the one hand, comprise sending and instruct, obtain data and said data are processed and displayed through the GPIB card; On the other hand through the RS232 serial ports with the single-chip microcomputer for the control core circuit board communicates, comprise sending controling instruction and receive the return signal of single-chip microcomputer.
Said frequency spectrograph is: the AV4062 type spectrum analyzer that The 41st Institute of CETC produces.AV4062 type spectrum analyzer has adopted multiple up-to-date designing technique, is a radio frequency spectrometer with high performance-price ratio, and the spectral range of scanning is: 9KHz～2.9GHz.This frequency spectrograph is connected with computing machine through the GPIB card on the one hand, and the input end of frequency spectrograph is connected on the near field probes through prime amplifier on the other hand.This frequency spectrograph is used to receive the electromagnetic field signal that near field probes records on the one hand, on the other hand the signal that receives is carried out sending computing machine to through the GPIB card after the proper process.Therefore, frequency spectrograph is a signal acquisition process station of hardware system.
The GPIB card that said computing machine is communicated by letter with spectrum analyzer is: company produces by American National instrument (NATIONALINSTRUMENTS, abbreviation NI), and model is GPIB-USB-HS.This GPIB card one end connects computing machine one end and connects frequency spectrograph, is the EBI that is used to connect computing machine and frequency spectrograph, has realized the information interaction between frequency spectrograph and the computing machine.
Said near field probes and prime amplifier are: this near field probes is that German LANGER EMV-Technik company produces, and has two groups seven, is included in the radio frequency near field probes group (RF1) and general low frequency (LF) the option group of low frequency of PCB internal interference source location.In the present invention; Only use in the near field probes group wherein; This near field probes is fixed on the movable supporting frame of three-dimensional machinery scanning platform, and the output cable is connected on the prime amplifier, and it is to be used for the instrument that the electromagnetic radiation data of measured pieces such as PCB is gathered in pointwise; This prime amplifier is: the PA303 in the PA series that German LANGER EMV-Technik company produces, and its nominal gain is 30dB, frequency range is 100KHz～3GHz; This prime amplifier one end connects a near field probes, and the other end is connected to the input end of said frequency spectrograph; It can carry out the signal that near field probes records pre-service and amplify, and makes frequency spectrograph can collect this faint electromagnetic field signal.
Saidly with the single-chip microcomputer for the control core circuit be: be core with the single-chip microcomputer, its peripheral circuit mainly comprises eight modules such as power circuit, reset circuit, crystal oscillating circuit, ISP download interface design circuit, JTAG emulation interface circuit, level shifting circuit, circuit for controlling motor and optoelectronic switch peripheral circuit.See Fig. 2, wherein, power circuit, reset circuit, crystal oscillating circuit and single-chip microcomputer are connected to form the minimum system of single-chip microcomputer, and just single-chip microcomputer can normally move in this case; ISP download interface design circuit, JTAG emulation interface circuit are connected with single-chip microcomputer and use when being used for download and debugged program; Level shifting circuit realizes that thereby level conversion is used for serial communication; Circuit for controlling motor (two) is connected with the Computer I mouth and is respectively applied for two stepper motors of control; And optoelectronic switch peripheral circuit (two) is connected with the singlechip interruption input port, thereby produces external interrupt for single-chip microcomputer provides look-at-me.Should be that the control core circuit receives steering order and parsing from serial ports of computers with the single-chip microcomputer, thereby drive stepping motor have realized the control to scan mode.This level shifting circuit is made up of resistance, the electric capacity of level transferring chip MAX232 and chip identification; This circuit for controlling motor is made up of resistance, the electric capacity of motor drive ic THB6128 and chip identification; This optoelectronic switch peripheral circuit is made up of resistance, the electric capacity of optoelectronic switch and chip identification; This reset circuit is made up of switch, diode, resistance and electric capacity; This ISP download interface design circuit only needs the 2*5 socket directly to be connected with single-chip microcomputer without any need for peripheral component; This JTAG emulation interface circuit is made up of four 10 resistance and 2*5 socket, and is connected with single-chip microcomputer; This power circuit adopts the LM2576 chip; Crystal oscillator is 8MHz in this crystal oscillating circuit; This single-chip microcomputer model is AVR ATmega32.
The USB-Serial Port Line of said connection computing machine and control circuit is: USB changes the cable of serial ports, and an end is a U S B interface, and the other end is the nine needles serial port interface.
Said stepper motor and supporting gearing are: this stepper motor is that to dispose two altogether be respectively 42 types (42BYG250BII) and 57 types (57BYG250AII) stepper motor to general two-phase hybrid stepping motor.It is interior near that side of one of which minor face that stepper motor is built in scanning platform, and be fixed on the base plate of scanning platform, and it is connected with its supporting gearing.Stepper motor is transformed into angular displacement with electric impulse signal, promptly gives a pulse signal, and stepper motor just rotates an angle, and the angular displacement of stepper motor is counted strictness with input pulse and is directly proportional.Stepper motor is to drive the motive power that near field probes is advanced.This gearing is a ball screw, and an end is connected on the axle of stepper motor, and the other end is fixed on another minor face that side relative with this that side of scanning platform one of which minor face.This ball-screw converts rotatablely moving of motor into rectilinear motion, thereby drives three-dimensional traversing carriage and fixing near field probes on it realizes that straight line moves.This three-dimensional machinery scanning platform is used for placing like measured objects such as pcb boards, and carries out three-dimensional through three-dimensional traversing carriage drive near field probes and move, and makes near field probes in a limited area, realize the autoscan to the pcb board measured piece.
Said three-dimensional machinery scanning platform is: be made up of sweep test platform, three-dimensional traversing carriage, probe clip, stepper motor and supporting parts such as gearing.See Fig. 3, wherein, this sweep test platform is a sheet metal, is used for placing the measured piece of electromagnetic compatibility scanning system test to be scanned, like chip, circuit board, cabinet, cable etc., is device carries out autoscan to measured piece hardware foundation.The sweep test platform surface is divided into effective scanning zone and white space; This effective scanning zone is the zone of grid shown in Fig. 3; Be meant the three-dimensional zone that can arrive of moving of near field probes, indicated origin position, X axle scale, Y axle scale and be the scale grid of the length of side with 1cm.This three-dimensional traversing carriage is seen Fig. 3, and it comprises vertical rack, support arm and inverse-U-shape rack three parts: this vertical rack is installed on the inverse-U-shape rack, can relatively move with inverse-U-shape rack; This support arm is installed in the front surface of vertical rack, can relatively move with vertical rack; But this inverse-U-shape rack relative scanning test platform relatively moves.This three-dimensional traversing carriage is to be used to drive near field probes to carry out the three-dimensional device that moves.This probe clip is seen Fig. 4, is installed on the support arm of three-dimensional traversing carriage, is used for fixing near field probes, and along with the mobile drive near field probes of support is carried out three-dimensional and moved in the effective scanning zone, and then realized the scan function of near field probes to measured piece.In Fig. 5, dash area is that the G zone is the position that probe clip is wanted clamping.Because the F zone is regional slightly thicker than E, makes the clip position each time of probe all immobilize, probe is easy to be fixed, and the user does not need time-consuming to remove to select clip position.Near field probes is a hexagon, designs the probe clip that meets this shape according to these characteristics, and it has not only realized the basic function of static probe, and can not produce any infringement to probe.
The scan control software systems comprise: the signal procedure between computing machine and the frequency spectrograph; Serial communication program between computing machine and the single-chip microcomputer; The driver of Single-chip Controlling stepper motor; Data Management Analysis and the program that shows; User oriented human-computer interaction interface program.
Annexation between them is as shown in Figure 6: the correlation parameter of user through this user oriented human-computer interaction interface program input spectrum appearance, steering order etc. and to the steering order of single-chip microcomputer, sweep parameter etc.; Signal procedure between this computing machine and the frequency spectrograph sends information such as the correlation parameter of user's input spectrum appearance, steering order to frequency spectrograph and realizes the control of frequency spectrograph and the data of received spectrum appearance; Serial communication program between this computing machine and the single-chip microcomputer is information such as the steering order of single-chip microcomputer, sweep parameter being sent to chip microcontroller to the initialization and the control of single-chip microcomputer and receive the relevant information of single-chip microcomputer; This single-chip microcomputer is realized Stepping Motor Control and driving through the driver of said Single-chip Controlling stepper motor according to the steering order of the computing machine that receives; This computing machine processs and displays the program of the data that receive from frequency spectrograph through said Data Management Analysis and demonstration.
Signal procedure between said computing machine and the frequency spectrograph is: the programming flowchart of this communication process is as shown in Figure 7; It comprises that computing machine reads the related data of frequency spectrograph to frequency spectrograph transmission instruction and computing machine.
Serial communication program between said computing machine and the single-chip microcomputer is: the communication flow diagram between computing machine and the single-chip microcomputer is as shown in Figure 8, and it comprises the program design of the serial communication programming and single-chip microcomputer (the being slave computer) aspect of computing machine (being host computer) aspect.Computing machine is as host computer, and the people can directly send through host computer and control order to slave computer, and shows the variation of various signals on the computer screen; And single-chip microcomputer is as slave computer, directly opertaing device (stepper motor) and obtain equipment (stepper motor) situation and give host computer.This process is: single-chip microcomputer is at first given in the order that computing machine sends, and it is stepper motor that single-chip microcomputer becomes the corresponding time sequence signal directly to control relevant device according to this command interpretation again; Single-chip microcomputer is that the stepper motor status data feeds back to computing machine with equipment frequently.The program of single-chip microcomputer comprises master routine, serial interrupt service routine and external interrupt program.Wherein, master routine is that the port, special register to necessity etc. carries out initialization, and waits for the arrival that serial is interrupted, and its process flow diagram is as shown in Figure 9; And concrete completion of serial interrupt service routine responds accordingly and stepper motor correspondingly controlled different communication instructions, i.e. instruction process subroutine, and its process flow diagram is shown in figure 10; The external interrupt program is used for response light and establishes shutoff by cable and " open " this mechanical action, and its process flow diagram is shown in figure 11.
The driver of said Single-chip Controlling stepper motor is: main pulse input signal with drive stepping motor rotation and stepper motor direction control signal to control motor positive and inverse.This pulse input signal mainly is to realize through loop statement; This stepper motor direction control signal is realized through the hypothesis statement.
Said Data Management Analysis and the program that shows are: because the data of extracting from frequency spectrograph are not directly available, we need handle these data, and the demonstration of electromagnetic radiation is designed; Its data processing comprise extract data, with the data qualification storage, data interpolating is level and smooth and part such as demonstration.
Said user oriented human-computer interaction interface program is: comprise that radiation event card, parameter are provided with card, amplitude data card, frequency data card, five parts of Serial Port Information card.
This radiation event card is: first panel at main interface, it comprises shift knob, real time data display window and radiation pattern viewing area.This real time data display window is owing to the frequency and the amplitude information of real-time each location point of reality in scanning process; This radiation pattern viewing area is used for reading scan and finishes the electromagnetic radiation diagram of the integral body that the back forms.
This parameter is provided with card: comprise that the frequency spectrograph parameter is provided with and the sweep parameter setting.This frequency spectrograph parameter setting window comprises the order input window, be provided with sweep wide, centre frequency etc. is set; This sweep parameter setting comprises that being divided into the setting of entire scan parameter, the setting of partial sweep parameter, step-length is provided with etc.
This amplitude data card is: the amplitude data of storing and show each location point.
This frequency data card is: the frequency data of storing and show each location point.
This Serial Port Information card is: serial ports, baud rate, the figure place of input data, the current control that comprises appointment such as is provided with at parameter.
Working routine of the present invention is following:
Should connect each hardware earlier before measuring, see Fig. 1.Test product (PCB) is positioned on the scanner platform, and frequency spectrograph links through GPIB and receives computing machine, and high sensitivity near field probes device is connected to the spectrum analyzer input end through amplifier on the high accuracy mechanical device; Then in computer software, import data such as calibration factor, sweep bandwidth; Computing machine sends the instruction control stepper motor driver through serial ports then; Driver drives stepper motor traction electric field or magnet field probe are by the surface of predetermined manner scanning test product; In case arrive the extreme position of three direction coordinate axis, even limit signal feeds back to computing machine and makes handled.Field intensity under certain sweep frequency can enough colored graph spectrums show visually; Can on computer screen, observe the electromagnetic radiation three-dimensional picture and the spectral change of product intuitively, all test datas all can be stored in the computing machine and printable come out.In addition, also can adopt manually-operated scanning: before emf probe, insert amplifier and be connected to frequency spectrograph again, manually mobile probe is more convenient so flexible, searches the leak position more easily.
Self-adaptive scanning device program of the present invention is that the serial communication program between signal procedure, computing machine and the single-chip microcomputer that combines between computing machine and the frequency spectrograph, the driver of Single-chip Controlling stepper motor and the Program Coordination of Data Management Analysis and demonstration are realized.Said self-adaptive scanning device program realization flow figure is shown in figure 12.In said adaptive scanning process, the probe step-length of advancing is " self-adaptation ", and it adjusts (become big, diminish or constant) according to the comparison of last two secondary data result to this stepping length accordingly.The travel path of probe is a serpentine path still, sees D among Figure 13.The synoptic diagram of advancing of popping one's head in the said adaptive scanning process; Shown in figure 13: wherein; Grid zone A representes the effective scanning zone of electromagnetic compatibility scanning system, white portion B represent to be placed on the effective scanning zone like measured pieces such as pcb boards, stain C representes that probe desires the stop place.
3, advantage and effect: a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test of the present invention; Its advantage has been to design a kind of adaptive scanning system: when electromagnetic radiation that a certain regional near field probes received is worth when basic identical; System can make it bigger than initial stepping according to this situation adjustment stepping length, thereby reduces sweep time to reduce unnecessary scanning step number; When electromagnetic radiation value difference that a certain regional near field probes received is very not big, can make it smaller according to this situation adjustment stepping length than initial stepping, like this can refinement electromagnetic radiation value, with the data of accurate electromagnetic radiation value.It is thus clear that the design of adaptive scanning system and realization have not only solved this problem of time waste, thereby have improved scan efficiency effectively, thereby and the accuracy that has also improved scan-data on the other hand improved the degree of accuracy of total system.
(4) description of drawings
Fig. 1 is a hardware system block diagram of the present invention.
Fig. 2 is to be the control core circuit block diagram with the single-chip microcomputer.
Fig. 3 is a three-dimensional machinery scanning platform synoptic diagram.(a front view; The b left view; The c vertical view)
Fig. 4 is the probe clip schematic cross-section.
Fig. 5 is the near field probes synoptic diagram.
Fig. 6 is each software section annexation synoptic diagram.
Fig. 7 be computing machine with frequency spectrograph between the programming flowchart of communicating by letter.
Fig. 8 is a program flow diagram between computing machine and the single-chip microcomputer.
Fig. 9 slave computer main program flow chart.
Figure 10 instruction process subroutine flow chart.
Figure 11 external interrupt program flow diagram.
Figure 12 adaptive scanning system program realization flow figure.
Figure 13 adaptive scanning system scan process synoptic diagram.
Figure 14 is a slave computer workflow diagram in the adaptive system.
Figure 15 is a host computer workflow diagram in the adaptive system.
Symbol description is following among the figure:
1 computing machine; 2 spectrum analyzers; The 3GPIB card; 4 near field probes and prime amplifier; 5 is the control core circuit with the single-chip microcomputer; 6 connect the USB-Serial Port Line of computing machine and control circuit; 7 stepper motors and supporting gearing; 8 three-dimensional machinery scanning platforms; 9 three-dimensional traversing carriages; 10 probe clips; 11 vertical racks; 12 support arms; 13 inverse-U-shape racks.
A effective scanning of the present invention zone; B is placed on the measured piece in effective scanning zone; The C probe is desired the stop place; The serpentine path that the D probe is advanced; The E afterbody of popping one's head in; The outstanding position of F probe; The position of G probe clip clamping.
(5) embodiment
To combine accompanying drawing and embodiment that the present invention is done further detailed description below.
See Fig. 1, a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test of the present invention is made up of hardware system and scan control software systems two parts.Hardware system comprises 3 one on GPIB card, near field probes and prime amplifier 4 one covers that 1 one in computing machine, 2 one of spectrum analyzers, computing machine and spectrum analyzer communicate by letter, be 5 one in control core circuit with the single-chip microcomputer, 7 liang of 6 one of USB-Serial Port Lines, stepper motor and supporting gearings being connected computing machine and control circuit overlaps and 8 one of three-dimensional machinery scanning platforms.
Position and annexation between them are: this computing machine 1 is connected on the spectrum analyzer 2 through GPIB card 3; The input end of this spectrum analyzer 2 is connected on the near field probes through near field probes and prime amplifier 4, and this near field probes is fixed on the three-dimensional traversing carriage 9 of three-dimensional machinery scanning platform 8; It is control core circuit 5 that this computing machine 1 is connected to the single-chip microcomputer through the USB-Serial Port Line 6 that connects computing machine and control circuit; Should be that control core circuit 5 connects stepper motor and supporting gearing 7 with the single-chip microcomputer, this stepper motor and supporting gearing 7 connect and the three-dimensional traversing carriage 9 of control three-dimensional machinery scanning platform 8 moves.Wherein, The circuit 5 that with the single-chip microcomputer is core is built in the three-dimensional machinery scanning platform 8; One cover stepper motor and supporting gearing 7 are built in the three-dimensional machinery scanning platform 8; Another set of stepper motor and supporting gearing 7 are built in the three-dimensional machinery scanning platform 8, and stepper motor exposes.
Said computing machine 1 is: family's desktop computer of Dell, adopt Windows XP system.This computing machine 1 is connected on the spectrum analyzer 2 through GPIB card 3 on the one hand, and being connected to the single-chip microcomputer through the USB-Serial Port Line 6 that connects computing machine and control circuit on the other hand is control core circuit 5.This computing machine 1 is the maincenter of system's control, data processing and demonstration.Communicate by letter with frequency spectrograph 2 on the one hand, comprise that transmission instructs, obtains data and said data are processed and displayed through GPIB card 3; Be that control core circuit 5 communicates through the RS232 serial ports and with the single-chip microcomputer on the other hand, comprise the return signal of sending controling instruction and reception single-chip microcomputer.
Said frequency spectrograph 2 is: the AV4062 type spectrum analyzer that The 41st Institute of CETC produces.AV4062 type spectrum analyzer has adopted multiple up-to-date designing technique, is a radio frequency spectrometer with high performance-price ratio, and the spectral range of scanning is: 9KHz～2.9GHz.This frequency spectrograph 2 is connected with computing machine 1 through GPIB card 3 on the one hand, and the input end of frequency spectrograph 2 is connected on the near field probes through prime amplifier on the other hand.This frequency spectrograph 2 is used to receive the electromagnetic field signal that near field probes records on the one hand, on the other hand the signal that receives is carried out sending computing machine 1 to through GPIB card 3 after the proper process.Therefore, frequency spectrograph 2 is signal acquisition process stations of hardware system.
The GPIB card 3 that said computing machine is communicated by letter with spectrum analyzer is: company produces by American National instrument (NATIONALINSTRUMENTS, abbreviation NI), and model is GPIB-USB-HS.These GPIB card 3 one ends connect computing machine 1 one ends and connect frequency spectrograph 2, are the EBIs that is used to connect computing machine 1 and frequency spectrograph 2, have realized the information interaction between frequency spectrograph 2 and the computing machine 1.
Said near field probes and prime amplifier 4 are: this near field probes is that German LANGER EMV-Technik company produces, and has two groups seven, is included in the radio frequency near field probes group (RF1) and general low frequency (LF) the option group of low frequency of PCB internal interference source location.In the present invention, only use in the wherein said near field probes group, this near field probes is fixed on the three-dimensional traversing carriage 9 of three-dimensional machinery scanning platform 8, and the output cable is connected on the prime amplifier.It is to be used for the instrument that the electromagnetic radiation data of measured pieces such as PCB is gathered in pointwise.This prime amplifier is: the PA303 in the PA series that German LANGEREMV-Technik company produces, and its nominal gain is 30dB, frequency range is 100KHz～3GHz; This prime amplifier one end connects a near field probes, and the other end is connected to the input end of said frequency spectrograph 2; It can carry out the signal that near field probes records pre-service and amplify, and makes frequency spectrograph 2 can collect this faint electromagnetic field signal.
See Fig. 2; Said is that control core circuit 5 is with the single-chip microcomputer: be core with the single-chip microcomputer, its peripheral circuit mainly comprises eight modules such as power circuit, reset circuit, crystal oscillating circuit, ISP download interface design circuit, JTAG emulation interface circuit, level shifting circuit, circuit for controlling motor and optoelectronic switch peripheral circuit.Wherein, this single-chip microcomputer model is AVRATmega32; This power circuit adopts the LM2576 chip; This reset circuit is made up of switch, diode, resistance and electric capacity; Crystal oscillator is 8MHz in this crystal oscillating circuit; This power circuit, reset circuit, crystal oscillating circuit and single-chip microcomputer are connected to form the minimum system of single-chip microcomputer, and just single-chip microcomputer can normally move in this case; ISP download interface design circuit, JTAG emulation interface circuit are connected with single-chip microcomputer and use when being used for download and debugged program; This ISP download interface design circuit only needs the 2*5 socket directly to be connected with single-chip microcomputer without any need for peripheral component; This JTAG emulation interface circuit is made up of four 10 resistance and 2*5 socket, and is connected with single-chip microcomputer; Level shifting circuit realizes that thereby level conversion is used for serial communication; Circuit for controlling motor (two) is connected with the Computer I mouth and is respectively applied for two stepper motors of control and supporting gearing 7; And optoelectronic switch peripheral circuit (two) is connected with the singlechip interruption input port, thereby produces external interrupt for single-chip microcomputer provides look-at-me.Should be that control core circuit 5 receives steering order and parsing from computing machine 1 serial ports with the single-chip microcomputer, thereby drive stepping motor and supporting gearing 7 have been realized the control to scan mode.This level shifting circuit is made up of resistance, the capacitance component of level transferring chip MAX232 and chip identification.This circuit for controlling motor is made up of resistance, the capacitance component of motor drive ic THB6128 and chip identification.This photoswitch circuit is made up of resistance, the capacitance component of optoelectronic switch and chip identification.
See Fig. 3, said three-dimensional machinery scanning platform 8 is: be made up of sweep test platform, three-dimensional traversing carriage 9, probe clip 10, stepper motor and supporting gearing 7 parts such as (two covers).Wherein, this sweep test platform is the measured piece that is used for placing the test to be scanned of electromagnetic compatibility scanning system, like chip, circuit board, cabinet, cable etc., is device carries out autoscan to measured piece hardware foundation.This sweep test platform is the sheet metal of size 800mm * 600mm * 10mm; The sweep test platform surface is divided into effective scanning zone and white space; This effective scanning zone is the zone of grid shown in Fig. 3; Be meant the three-dimensional zone that can arrive of moving of near field probes, indicated origin position, X axle scale, Y axle scale and be the scale grid of the length of side that this effective scanning zone is 500mm * 400mm with 1cm.This three-dimensional traversing carriage 9 (as shown in Figure 3), it comprises vertical rack 11, support arm 12 and inverse-U-shape rack 13 3 parts: vertical rack 11 is installed on the inverse-U-shape rack 13, can relatively move with inverse-U-shape rack 13; Support arm 12 is installed in the front surface of vertical rack 11, can relatively move with vertical rack 11; But inverse-U-shape rack 13 relative scanning test platforms relatively move.The distance of these inverse-U-shape rack 13 middle cross beams and platform is 300mm, crossbeam thickness 50mm.The dynamic distance of near field probes and sweep test platform is 0～250mm, and the height of said support arm 12 is 300mm.This three-dimensional traversing carriage 9 is to be used to drive near field probes to carry out the three-dimensional device that moves.Wherein, This probe clip 10; As shown in Figure 4, be installed on the support arm 12 of three-dimensional traversing carriage 9, it is as shown in Figure 5 to be used for fixing near field probes; And along with the mobile drive near field probes of three-dimensional traversing carriage 9 is carried out three-dimensional and moved in the effective scanning zone, and then realized the scan function of near field probes to measured piece.In near field probes synoptic diagram Fig. 5, dash area is that the G zone is the position that probe clip 10 is wanted clamping.Because the F zone is regional slightly thicker than E, makes the clip position each time of probe all immobilize, probe is easy to be fixed, and the user does not need time-consuming to remove to select clip position.Near field probes is a hexagon, designs the probe clip 10 that meets this shape according to these characteristics, and it has not only realized the basic function of static probe, and can not produce any infringement to probe.This stepper motor and supporting gearing 7 are: stepper motor is general two-phase hybrid stepping motor, disposes two altogether, is respectively 42 types (42BYG250BII) and 57 types (57BYG250AII) stepper motor.It is interior near that side of scanning platform one of which minor face that stepper motor is built in scanning platform, and be fixed on the base plate of scanning platform, and its axle is connected with its gearing.Stepper motor is transformed into angular displacement with electric impulse signal, promptly gives a pulse signal, and stepper motor just rotates an angle, and the angular displacement of stepper motor is counted strictness with input pulse and is directly proportional.Stepper motor is to drive the motive power that near field probes is advanced.Its gearing is a ball screw, and an end is connected on the axle of stepper motor, and the other end is fixed on another minor face that side relative with this that side of scanning platform one of which minor face.This ball-screw converts rotatablely moving of motor into rectilinear motion, thereby drives three-dimensional traversing carriage 9 and fixing near field probes on it realizes that straight line moves.This three-dimensional machinery scanning platform 8 is used for placing like measured objects such as pcb boards, and carries out three-dimensional through three-dimensional traversing carriage 9 drive near field probes and move, and makes near field probes in a limited area, realize the autoscan to the pcb board measured piece.
The scan control software section comprises: the signal procedure between computing machine 1 and the frequency spectrograph 2; Serial communication program between computing machine 1 and the single-chip microcomputer; The driver of Single-chip Controlling stepper motor; Data Management Analysis and the program that shows; User oriented human-computer interaction interface program.
See Fig. 6, the annexation between them is: user's correlation parameter and steering order through said user oriented human-computer interaction interface program input spectrum appearance etc. and to the steering order of single-chip microcomputer and sweep parameter etc.; Signal procedure between this computing machine 1 and the frequency spectrograph 2 sends information such as the correlation parameter of user's input spectrum appearance and steering order to frequency spectrograph 2 and realizes the control of frequency spectrograph 2 and the data of received spectrum appearance 2; Serial communication program between this computing machine 1 and the single-chip microcomputer is information such as the steering order of single-chip microcomputer and sweep parameter are sent to chip microcontroller to the initialization of single-chip microcomputer and the relevant information of control and reception single-chip microcomputer; Single-chip microcomputer is realized Stepping Motor Control and driving through the driver of Single-chip Controlling stepper motor according to the steering order of the computing machine 1 that receives; Computing machine 1 processs and displays the program of the data that receive from frequency spectrograph 2 through said Data Management Analysis and demonstration.
Signal procedure between said computing machine 1 and the frequency spectrograph 2 is: the programming flowchart of this communication process, and as shown in Figure 7; It comprises that computing machine 1 reads the related data of frequency spectrograph 2 to frequency spectrograph 2 transmission instructions and computing machine 1.
Serial communication program between said computing machine 1 and the single-chip microcomputer is: the communication flow diagram between computing machine 1 and the single-chip microcomputer; As shown in Figure 8, it comprises the program design of the serial communication programming and single-chip microcomputer (the being slave computer) aspect of computing machine 1 (being host computer) aspect.Computing machine 1 is as host computer, and the people can directly send through host computer and control order to slave computer, and shows the variation of various signals on computing machine 1 screen; And single-chip microcomputer is as slave computer, directly opertaing device (stepper motor) and obtain equipment (stepper motor) situation and give host computer.This process is: slave computer is at first given in the order that host computer sends, and single-chip microcomputer becomes the corresponding time sequence signal directly to control relevant device according to this command interpretation again; Slave computer feeds back to computing machine 1 with device status data frequently.The program of slave computer comprises master routine, serial interrupt service routine and external interrupt program.Wherein, master routine is that the port, special register to necessity etc. carries out initialization, and waits for the arrival that serial is interrupted, and its process flow diagram is as shown in Figure 9; And concrete completion of serial interrupt service routine responds accordingly and stepper motor carried out control corresponding different communication instructions, i.e. instruction process subroutine, and its process flow diagram is shown in figure 10; External program is used for response light and establishes shutoff by cable and " open " this mechanical action, and its process flow diagram is shown in figure 11.
The driver of said Single-chip Controlling stepper motor is: mainly comprise pulse input signal with drive stepping motor rotation and stepper motor direction control signal to control motor positive and inverse.This pulse input signal mainly is to realize through loop statement; This stepper motor direction control signal is realized through the hypothesis statement.
Said Data Management Analysis and the program that shows are: because the data of extracting from frequency spectrograph 2 are not directly available; We need handle these data; And the demonstration of electromagnetic radiation designed, its data processing comprise extract data, with the data qualification storage, data interpolating is level and smooth and part such as demonstration.
Said user oriented human-computer interaction interface program is: comprise that radiation event card, parameter are provided with card, amplitude data card, frequency data card, five parts of Serial Port Information card.
This radiation event card is: first panel at main interface, it comprises shift knob, real time data display window and radiation pattern viewing area.This real time data display window is owing to the frequency and the amplitude information of real-time each location point of reality in scanning process; This radiation pattern viewing area is used for reading scan and finishes the electromagnetic radiation diagram of the integral body that the back forms.
This parameter is provided with card: comprise that the frequency spectrograph parameter is provided with and the sweep parameter setting.This frequency spectrograph parameter setting window comprises the order input window, be provided with sweep wide, centre frequency etc. is set; This sweep parameter setting comprises that being divided into the setting of entire scan parameter, the setting of partial sweep parameter, step-length is provided with etc.
This amplitude data card is: the amplitude data of storing and show each location point.
This frequency data card is: the frequency data of storing and show each location point.
This Serial Port Information card is: serial ports, baud rate, the figure place of input data, the current control that comprises appointment such as is provided with at parameter.
The scan function of a kind of self-adaptive scanning device with electromagnetic compatibility of the present invention comprises entire scan, partial sweep and adaptive scanning.Wherein, entire scan is a kind of scan method of routine, promptly whole plate is scanned, and test result also is the situation of the electromagnetic radiation of whole plate; Partial sweep; Normally the user carry out whole coarse scan later on or user experience judge that a certain regional area is the zone that the user is concerned about; So only need this zone of being concerned about is scanned, can reduce sweep time like this, effectively raise scan efficiency; Adaptive scanning is a kind of novel scan mode that the present invention designs, and using adaptive scanning also is to reduce sweep time, improve the scan efficiency and the method for the practicality of a kind of innovation of precision as a result.Be described in detail in the face of self-adaptive scanning device down:
The present invention is a kind of self-adaptive scanning device with electromagnetic compatibility.At hardware aspect (referring to Fig. 1), self-adaptive scanning device is the process of controlling and coordinating between computing machine 1, single-chip microcomputer, near field probes, frequency spectrograph 2 and the stepper motor.Aspect software, the self-adaptive scanning device program combines C programmer and virtual instrument program design to realize.
Self-adaptive scanning device program of the present invention is that the serial communication program between signal procedure, computing machine 1 and the single-chip microcomputer that combines between computing machine 1 and the frequency spectrograph 2, the driver of Single-chip Controlling stepper motor and the Program Coordination of Data Management Analysis and demonstration are realized.Said self-adaptive scanning device program realization flow figure is shown in figure 12.In said adaptive scanning process, the probe step-length of advancing is " self-adaptation ", and it adjusts (become big, diminish or constant) according to the comparison of last two secondary data result to this stepping length accordingly.The travel path of probe is a serpentine path still, sees D among Figure 13.The synoptic diagram of advancing of popping one's head in the said adaptive scanning process; Shown in figure 13: wherein; Grid zone A representes the effective scanning zone of electromagnetic compatibility scanister, white portion B represent to be placed on the effective scanning zone like measured pieces such as pcb boards, stain C representes that probe desires the stop place.An end points with measured pieces such as pcb boards before scanning overlaps with scanning area zero point, places measured pieces such as pcb board according to mode shown in figure 13.Scanning is carried out pointwise with specific stepping according to serpentine path (seeing D among Figure 13) since zero point and is read electromagnetic field information, and when the electromagnetic radiation value according to the measurement gained of front differed big, the adjustment stepping diminished length, like 8～14 zones among Figure 13; When the electromagnetic radiation value according to the measurement gained of front differs hour, the adjustment stepping makes length become big, like 14～18 zones among Figure 13.
This self-adaptive scanning device of the present invention, its realization flow of manipulating method is shown in figure 12, and performing step is following:
At first, computing machine 1 obtains scanning informations such as sweep limit, stepping length according to the parameter of user's input;
In second step, computing machine 1 generates the instruction of advancing accordingly according to scanning information and sends to single-chip microcomputer;
In the 3rd step, single-chip microcomputer is done corresponding action according to the instruction drive stepping motor of advancing accordingly;
In the 4th step, near field probes is advanced under the drive of stepper motor, measures the electromagnetic radiation value of this position after the location;
In the 5th step, frequency spectrograph 2 receives the electromagnetic radiation value that near field probes measures, and the electromagnetic radiation value that obtains of computing machine 1 received spectrum appearance 2;
In the 6th step, computing machine 1 judges whether to exceed sweep limit, if do not have, and the electromagnetic radiation value that comparative analysis measures, thus according to analyzing adjustment stepping length, repeated for second step then; If exceed sweep limit, data are carried out processes and displays, termination routine then.
See Figure 14; In self-adaptive scanning device; Slave computer will constantly receive the instruction of carrying different stepping length informations that host computer sends; Thereby constantly go again the motion of drive stepping motor according to different instructions, make probe can in a scanning process, realize the scanning form of stepping adjustable in length.
See Figure 15; Host computer will compare available data and data before after the data that at every turn receive frequency spectrograph 2 transmission, thus the stepping length information that adjustment scanning next time needs; Obtain new scanning information, integrate new instruction and send to slave computer.
Claims (9)
1. self-adaptive scanning device with electromagnetic compatibility that is used for near-field test, it is characterized in that: this device comprises:
GPIB card, near field probes and the prime amplifier that computing machine, spectrum analyzer, computing machine and spectrum analyzer are communicated by letter, be the control core circuit with the single-chip microcomputer, be connected computing machine and be USB-Serial Port Line, stepper motor and the supporting gearing and the three-dimensional machinery scanning platform of control core circuit with the single-chip microcomputer; Position and annexation between them are: this computing machine links through GPIB and receives on the spectrum analyzer; The input end of this spectrum analyzer is connected on the near field probes through prime amplifier; This near field probes is fixed on the three-dimensional traversing carriage of three-dimensional machinery scanning platform; It is the control core circuit that this computing machine is connected to the single-chip microcomputer through the USB-Serial Port Line; Should be with the single-chip microcomputer for the control core circuit connect stepper motor and supporting gearing, this stepper motor and supporting gearing connect and the three-dimensional traversing carriage of control three-dimensional machinery scanning platform moves, and should be built in the three-dimensional machinery scanning platform for the control core circuit with the single-chip microcomputer; One cover stepper motor and supporting gearing are built in the three-dimensional machinery scanning platform; Another set of stepper motor and supporting gearing, its gearing is built in the three-dimensional machinery scanning platform, and stepper motor exposes;
Said computing machine is: adopt the Dell family desktop computer of Windows XP system, this computing machine links to receive on the spectrum analyzer and with spectrum analyzer through GPIB and communicates by letter, and comprises sending instruction, obtaining data and said data are processed and displayed; Being connected to the single-chip microcomputer through the USB-Serial Port Line is the control core circuit, comes the return signal of sending controling instruction and reception single-chip microcomputer;
Said spectrum analyzer is: AV4062 type spectrum analyzer; The spectral range of its scanning is: 9KHz～2.9GHz; This spectrum analyzer is connected with computing machine through the GPIB card, and the input end of spectrum analyzer is connected on the near field probes through prime amplifier; This spectrum analyzer is used to receive the electromagnetic field signal that near field probes records on the one hand, on the other hand the signal that receives is carried out sending computing machine to through the GPIB card after the proper process;
The GPIB card that said computing machine is communicated by letter with spectrum analyzer is: model is GPIB-USB-HS; This GPIB card one end connects computing machine, and an end connects spectrum analyzer, is the EBI that is used to connect computing machine and spectrum analyzer, has realized the information interaction between spectrum analyzer and the computing machine;
Said near field probes and prime amplifier are: this near field probes is that German LANGER EMV-Technik company produces, and the radio frequency near field probes group that is included in PCB internal interference source location is that the general low frequency option group of RF1 and low frequency is LF; Use in the radio frequency near field probes group wherein, this near field probes is fixed on the three-dimensional traversing carriage of three-dimensional machinery scanning platform, and the output cable is connected on the prime amplifier; This prime amplifier is: the PA303 in the PA series that German LANGER EMV-Technik company produces, and its nominal gain is 30dB, frequency range is 100KHz～3GHz; This prime amplifier one end connects near field probes, and the other end is connected to the input end of spectrum analyzer; It can carry out the signal that near field probes records pre-service and amplify, and makes spectrum analyzer can collect this electromagnetic field signal;
Saidly with the single-chip microcomputer for the control core circuit be: be core with the single-chip microcomputer, its peripheral circuit mainly comprises power circuit, reset circuit, crystal oscillating circuit, ISP download interface design circuit, JTAG emulation interface circuit, level shifting circuit, circuit for controlling motor and eight modules of optoelectronic switch peripheral circuit; Wherein, power circuit, reset circuit, crystal oscillating circuit and single-chip microcomputer are connected to form the minimum operational system of single-chip microcomputer, and ISP download interface design circuit, JTAG emulation interface circuit are connected with single-chip microcomputer and use when being used for download and debugged program; Level shifting circuit realizes that thereby level conversion is used for serial communication; Two circuit for controlling motor are connected with the Computer I mouth and are respectively applied for two stepper motors of control; And two optoelectronic switch peripheral circuits are connected with the singlechip interruption input port, thereby produce external interrupt for single-chip microcomputer provides look-at-me; Should be that the control core circuit receives steering order and parsing from serial ports of computers with the single-chip microcomputer, thereby drive stepping motor have realized the control to scan mode; This level shifting circuit is made up of resistance, the electric capacity of level transferring chip MAX232 and chip identification; This circuit for controlling motor is made up of resistance, the electric capacity of motor drive ic THB6128 and chip identification; This optoelectronic switch peripheral circuit is made up of resistance, the electric capacity of optoelectronic switch and chip identification; This reset circuit is made up of switch, diode, resistance and electric capacity; This ISP download interface design circuit only needs the 2*5 socket directly to be connected with single-chip microcomputer; This JTAG emulation interface circuit is made up of four 10 Ohmages and 2*5 socket, and is connected with single-chip microcomputer; This power circuit adopts the LM2576 chip; Crystal oscillator is 8MHz in this crystal oscillating circuit; This single-chip microcomputer model is AVR ATmega32;
Said connection computing machine with the USB-Serial Port Line that with the single-chip microcomputer is the control core circuit is: USB changes the cable of serial ports, and an end is a USB interface, and the other end is the nine needles serial port interface;
Said stepper motor and supporting gearing are: this stepper motor is general two-phase hybrid stepping motor, and disposing two altogether is respectively that 42 types are that 42BYG250BII and 57 types are the 57BYG250AII stepper motor; It is interior near that side of minor face that stepper motor is built in the three-dimensional machinery scanning platform, and be fixed on the base plate of three-dimensional machinery scanning platform, and it is connected with its supporting gearing; This gearing is a ball screw, and an end is connected on the axle of stepper motor, and the other end is fixed on the relative opposite side of that side of three-dimensional machinery scanning platform minor face;
Said three-dimensional machinery scanning platform is: be made up of sweep test platform, three-dimensional traversing carriage and probe clip; This sweep test platform is the sheet metal of 800mm * 600mm * 10mm, is used for placing the measured piece of self-adaptive scanning device with electromagnetic compatibility test to be scanned; This three-dimensional traversing carriage comprises vertical rack, support arm and inverse-U-shape rack three parts: this vertical rack is installed on the inverse-U-shape rack, can relatively move with inverse-U-shape rack; This support arm is installed in the front surface of vertical rack, can relatively move with vertical rack; This inverse-U-shape rack can relatively move to the sweep test platform; This probe clip is installed on the support arm of three-dimensional traversing carriage, is used for fixing near field probes, and along with the mobile drive near field probes of support is carried out three-dimensional moving and realized the scan function to measured piece in the effective scanning zone.
2. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this number of computers is 1.
3. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this spectrum analyzer quantity is 1.
4. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: the GPIB card that this computing machine is communicated by letter with spectrum analyzer is 1.
5. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this near field probes and prime amplifier quantity are a cover.
6. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: should be with the single-chip microcomputer be one for the control core circuit quantity.
7. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this connection computing machine is one with the USB-Serial Port Line quantity that is the control core circuit with the single-chip microcomputer.
8. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this stepper motor and supporting gearing quantity are two covers.
9. a kind of self-adaptive scanning device with electromagnetic compatibility that is used for near-field test according to claim 1 is characterized in that: this three-dimensional machinery scanning platform quantity is one.
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| CN101750546A (en) | 2010-06-23 |
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