CN105445652B - A kind of offline contrast test device and method of circuit board based on lissajouf figure - Google Patents
A kind of offline contrast test device and method of circuit board based on lissajouf figure Download PDFInfo
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- CN105445652B CN105445652B CN201510991907.3A CN201510991907A CN105445652B CN 105445652 B CN105445652 B CN 105445652B CN 201510991907 A CN201510991907 A CN 201510991907A CN 105445652 B CN105445652 B CN 105445652B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/316—Testing of analog circuits
- G01R31/3163—Functional testing
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention discloses a kind of offline contrast test device and method of circuit board based on lissajouf figure, described device includes：Intelligent terminal, source measuring unit module and testing control module；Source measuring unit module further includes：First voltage source submodule, the first output impedance submodule and monitoring submodule, the first voltage source submodule are used to provide the four-quadrant driving voltage signal output for including remote sensing；The output impedance submodule is used to be matched with the impedance on circuit-under-test board component node line, the distribution of balanced driving voltage；The monitoring submodule is used to monitor real work voltage and output current of the loading in measured device port in real time；The testing control module further includes：The second voltage source control submodule, the second output impedance control submodule and measurement display sub-module.The present apparatus passes through the contrast test to fine or not circuit board, test and fault location convenient, fast, that intuitively carry out circuit board.
Description
Technical field
The invention belongs to circuit board automatic checkout equipment technical field, more particularly to a kind of circuit based on lissajouf figure
The offline contrast test device and method of plate.
Background technology
The development of modern electronic technology proposes the Support ability of electronic equipment requirements at the higher level, and wherein circuit board is surveyed
Examination and fault diagnosis technology largely improve the Support ability of board level product, and being provided for electronic equipment has by force
The guarantee of power, while also possess the prospect of being widely applied.
Current existing circuit board detection equipment structure is relatively complicated, and space occupancy rate is big, expensive, and is mostly
PCB Online testing, therefore portable, flexibility and Cost Design become the main bottleneck for restricting the field technology development.Research
Prove, can be realized using lissajouf figure and conveniently qualitative examination is carried out to electronic components such as capacitance, inductance, especially
It is the difference that sample and certified products can be determined by lissajouf figure contrast, is widely used in the failure of electronic circuit board
Detection, and port analog specificity analysis is also a kind of fault detection technique for being widely used in electronic circuit board, which need not
It is related to circuit theory, device function, it is not required that circuit is in running order.Based on lissajouf figure and port analog characteristic point
Effective combination of this two technologies is analysed, the applicant provides a kind of offline contrast test device of portable circuit board.
The content of the invention
It is an object of the present invention to overcome drawbacks described above, the present invention provides a kind of contrast by fine or not circuit board
Test, test and fault location convenient, fast, that intuitively carry out circuit board.
To achieve these goals, the present invention provides a kind of circuit board based on lissajouf figure offline contrast test dress
Put, the offline contrast test device of circuit board includes：Intelligent terminal, two source measuring unit modules and testing control module；
Wherein, described two source measuring unit modules are located in two PXIe grooves positions of intelligent terminal, the testing control module installation
Run on intelligent terminal.
Each source measuring unit module further includes：First voltage source submodule, the first output impedance submodule and prison
Submodule is surveyed, the first voltage source submodule is used to provide the four-quadrant driving voltage signal output for including remote sensing；It is described defeated
Go out impedance sub-block be used for and circuit-under-test board component node line on impedance matched, balanced driving voltage divide
Match somebody with somebody；The monitoring submodule is used to monitor real work voltage and output current of the loading in measured device port in real time.
The testing control module further includes：The second voltage source control submodule, the second output impedance control submodule
Block and measurement display sub-module, wherein, the second voltage source control submodule is used for the first of voltage input measuring unit module
The pumping signal of the configurable form of voltage source submodule output, the pumping signal further comprise sine wave, square wave, triangular wave
And sawtooth waveforms, and each wave-shape amplitude and frequency using gear configuration by the way of, without intersection between each gear；Second output
Impedance control submodule is used for the matching impedance size for controlling the first output impedance submodule, is additionally operable to control circuit-under-test plate member
Impedance on device nodes circuit is matched, and the gear of each matching impedance corresponds to the amplitude shelves of a pumping signal
Position；The measurement display sub-module shows pair of faultless circuit plate and circuit board under test by way of lissajouf figure contrast
Answer the contrast test result of component node.
Optionally, above-mentioned measurement display sub-module further includes：Measurement submodule and mode of learning submodule in real time；
The measurement submodule in real time, for faultless circuit plate and the corresponding component node of circuit board under test is same
When load scanning and excitation test, and in real time gather component node port response characteristic signal, measured according to collection result
Display sub-module draws Li Shayu comparative patterns.
The mode of learning submodule, for extracting faultless circuit plate member device from the data record that intelligent terminal stores
The indicatrix of part node, and the test result curve of component node corresponding to circuit board under test carries out graphics Web publishing, according to
Contrast test difference size judges that circuit board under test has fault-free；Wherein, the reference data of mode of learning is：To fault-free electricity
The key components node of road plate is tested, and is carried out test result as the port diagnostic curve of corresponding component node
Data store.
Optionally, when carrying out contrast test to faultless circuit plate and circuit board under test, two component nodes are applied
The size of the waveform of pumping signal, amplitude, frequency and matching impedance is added to use identical configuration.
Above-mentioned the second voltage source control submodule also includes：Manual configuration unit and automatically configure unit；Wherein, the hand
Dynamic dispensing unit sets the amplitude, frequency and matching impedance of pumping signal to produce pumping signal by artificial selection, acts on
Circuit-under-test board component node；The unit that automatically configures selects each gear amplitude and frequency one by one by gear incremental manner
Pumping signal, simultaneous selection and the corresponding matching impedance of amplitude gear are produced, controls the maximum of each gear pumping signal amplitude
Value acts on circuit-under-test plate, by the current signal collected compared with reference current value, based on this as automatic
Dispensing unit selects the foundation of pumping signal amplitude and frequency.
In addition, present invention also offers a kind of offline contrast test method of circuit board based on lissajouf figure, the side
Method includes：
Step 101) generation test faultless circuit plate and the required pumping signal of circuit board under test.
Pumping signal is applied to two circuit boards by step 102) at the same time, and gathers each corresponding element device nodes of two circuit boards
Response signal, extract the indicatrix of each node port response signal, i.e. lissajouf figure on this basis.
Step 103) is bent by the response signal feature for comparing faultless circuit plate and each component node of circuit board under test
Line carries out fault detect positioning, determines that circuit board under test whether there is failure, and determine abort situation.
Optionally, above-mentioned steps 101) further include：
Step 101-1) each source measuring unit module of initialization, configure two sources with identical voltage source running parameter and survey
Unit module is measured, wherein the voltage source running parameter includes：Waveform, voltage or frequency.
Step 101-2) two source measuring unit modules of configuration and voltage gear non-colinear position output impedance.
Above-mentioned steps 102) further include：
Step 102-1) according to voltage source running parameter calculating scanning voltage array, determine the total points of scanning, and setting is swept
The initial value of described point number.
Step 102-2) the corresponding scanning voltage of number of scan points is chosen, and export scanning voltage.
Step 102-3) collection in step 101-2) choose scanning voltage excitation under, faultless circuit plate and electricity to be measured
The output voltage and operating current of road plate corresponding element device nodes port, and record collection value.
Step 102-4) increment operator processing is carried out to number of scan points.
Step 102-5) judge whether number of scan points reaches the maximum of scanning voltage array, if it is not, then return to step
102-2)；If so, entering step 102-6).
Step 102-6) drawn according to each scanning element characteristic of collection and show faultless circuit plate and circuit under test
The Li Shayu waveforms of plate corresponding element device nodes, and then obtain contrast oscillogram.
Step 102-7) value for contrasting tolerance is set.
Step 102-8) judge contrast oscillogram maximum difference whether in the tolerance of setting, if,
Circuit board under test fault-free；If not in the range of the tolerance of setting, the current institute's survey component node of circuit board under test
There are failure.
The principle that above-mentioned selection scanning is always counted need to meet following condition：1) swept according to what scanning voltage array was drawn out
It is undistorted to retouch voltage waveform；2) acquisition time of the whole waveform of source measuring unit module scans completion is no more than 5s；With 3) with
In the range of the stand-by period that family can be born.
The device of the invention is first in terms of circuit board testing using the thought of portable construction design in summary, to good
Bad circuit board is carried out at the same time contrast test, and analysis circuit plate corresponds to the port identity of the component node of test, draws corresponding
Li Shayu comparative patterns, to carry out the offline contrast test of circuit board.Test device configuration of the present invention is simple, and device volume can
Concentrate as the 20% of traditional test platform, be greatly reduced the development cost of user.Realize technical scheme
It is as follows：
The offline contrast test device of circuit board based on lissajouf figure, is designed using portable construction, by intelligent terminal,
Source measuring unit module and testing control module composition, wherein, intelligent terminal, which uses, facilitates two light and handy groove PXIe Intelligent flats
Computer, is the carrier of source measuring unit module and testing control module, and terminal display screen uses multiple spot capacitance touching control technology, is used
Family smoothness easy to operate.
When faultless circuit plate and circuit board under test corresponding element device nodes carry out contrast test, apply pumping signal
Waveform, amplitude, the size of frequency and matching impedance use identical configuration.
The measurement real-time measurement pattern of display unit of the present invention further provides for voltage responsive and current-responsive figure
Way of contrast, i.e., carried out respectively by the operating voltage and operating current figure of contrast circuit board component node port straight
Sight is compared, and judges that circuit board under test has fault-free.
Lee's sand-base cultivation contrast test result difference size of the present invention realizes that tolerance is by way of defining tolerance
Judge that circuit board under test has trouble-free threshold value.User can be according to the self-defined setting of difference size of comparative pattern, empirical value
20%.Operate for the convenience of the user, tolerance set-up mode can by 1 plus-minus, also can by 10 plus-minuss, tolerance magnitude range for 1%~
99%.
Compared with existing design, the technical advantages of the present invention are that：
The invention discloses a kind of offline contrast test device of circuit board based on lissajouf figure, the invention is using small-sized
Change, portable construction design philosophy, agent structure uses two groove PXIe intelligent flat computers, embeds controller, and integrates
Layer test application software, by PXIe bus marcos source measuring unit module, the survey of external red and black test pencil connection circuit-under-test plate
Pilot, voltage input measuring unit module produces test and excitation signal function in circuit-under-test board test point, according to the end monitored
Mouth response signal extraction indicatrix draws lissajouf figure, by graph direct way of contrast, understands circuit being not required to user
In the case of principle, fault detect is carried out to circuit board, simple and fast is easy to use.The invention can produce polytype, width
The configurable test and excitation signal of frequency is spent, while provides and manually and automatically configures both of which, can realize circuit-under-test
Connecting for board component node characteristic signal is adopted, and real-time is good, while provides voltage responsive and the electric current sound of component node
Reply is realized than waveform, the result difference size of graphic correlation test by way of defining tolerance.
Brief description of the drawings
Fig. 1 is the test philosophy schematic diagram of apparatus of the present invention；
Fig. 2 is the test connection signal block diagram of the circuit board offline contrast test device of the invention based on lissajouf figure；
Fig. 3 is apparatus of the present invention unit module theory of constitution schematic diagram；
Fig. 4 is the workflow schematic diagram of apparatus of the present invention testing control module；
Fig. 5 is configuration testing pumping signal amplitude/frequency principle process schematic diagram under automatic test pattern of the present invention.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the test philosophy schematic diagram of apparatus of the present invention, and faultless circuit plate and circuit board under test generation are surveyed first
Required pumping signal is tried, then pumping signal is applied to two circuit boards at the same time, and gather each corresponding element of two circuit boards
The response signal of device nodes, extracts the indicatrix of each component node response signal, i.e. lissajouf figure on this basis,
Failure inspection is carried out finally by the response signal indicatrix for comparing faultless circuit plate and each component node of circuit board under test
Position is measured, determines that circuit board under test whether there is failure, and determine abort situation.
It is the circuit board offline contrast test device to test connection signal frame of the invention based on lissajouf figure shown in Fig. 2
Figure.The offline contrast test device of circuit board provided by the invention includes：Intelligent terminal, two source measuring unit modules and test are controlled
Molding block.Wherein, intelligent terminal is connected by PXIe buses and controls two source measuring unit modules by testing control module
Normal work.Module connects circuit board element node and earth point by red-black test pencil respectively, forms test loop.Test
When, black meter pen connects the earth point of circuit board under test, and red test pencil movement between each component node of circuit-under-test plate is surveyed
Examination.
Fig. 3 show apparatus of the present invention unit module theory of constitution schematic block diagram, including intelligent terminal, source measuring unit mould
Block and testing control module.The source measuring unit module include first voltage source submodule, the first matching impedance submodule and
Monitor submodule.First voltage source submodule produces pumping signal, the output of the first matching impedance submodule as voltage source first
Impedance, as the current-limiting resistance on working line, finally monitors submodule respectively as voltmeter and electric current table function, supervises in real time
Survey the operating current being loaded into the operating voltage and circuit of circuit-under-test board component node.
The testing control module further includes：The second voltage source control submodule, the second output impedance control submodule
Block and measurement display sub-module, wherein, the second voltage source control submodule is used for the first of voltage input measuring unit module
The pumping signal of the configurable form of voltage source submodule output, the pumping signal further comprise sine wave, square wave, triangular wave
And sawtooth waveforms, and each wave-shape amplitude and frequency using gear configuration by the way of, without intersection between each gear；Second output
Impedance control submodule is used for the matching impedance size for controlling the first output impedance submodule, is additionally operable to control circuit-under-test plate member
Impedance on device nodes circuit is matched, and the gear of each matching impedance corresponds to the amplitude shelves of a pumping signal
Position；The measurement display sub-module shows pair of faultless circuit plate and circuit board under test by way of lissajouf figure contrast
Answer the contrast test result of component node.
The measurement display sub-module further includes：Measurement submodule and mode of learning submodule in real time；
The measurement submodule in real time, for faultless circuit plate and the corresponding component node of circuit board under test is same
When load scanning and excitation test, and in real time gather component node port response characteristic signal, measured according to collection result
Display sub-module draws Li Shayu comparative patterns；
The mode of learning submodule, for extracting faultless circuit plate member device from the data record that intelligent terminal stores
The indicatrix of part node, and the test result curve of component node corresponding to circuit board under test carries out graphics Web publishing, according to
Contrast test difference size judges that circuit board under test has fault-free；Wherein, the reference data of mode of learning is：To fault-free electricity
The key components node of road plate is tested, and is carried out test result as the port diagnostic curve of corresponding component node
Data store.
Above-mentioned the second voltage source control submodule also includes：Manual configuration unit and automatically configure unit；
Wherein, the manual configuration unit sets amplitude, frequency and the matching impedance of pumping signal by artificial selection
Pumping signal is produced, acts on circuit-under-test board component node；It is described to automatically configure unit by gear incremental manner one by one
Select each gear amplitude and frequency to produce pumping signal, simultaneous selection and the corresponding matching impedance of amplitude gear, control each shelves
The maximum of position pumping signal amplitude acts on circuit-under-test plate, and the current signal collected is compared with reference current value
Compared with based on this as the foundation for automatically configuring Unit selection pumping signal amplitude and frequency.
Fig. 4 show the workflow schematic diagram of apparatus of the present invention testing control module, is the single first device of circuit-under-test plate
The contrast test process of part node, is worked by testing control module voltage input measuring unit module according to set flow.Mainly
Workflow is as follows：
Step 101) generation test faultless circuit plate and the required pumping signal of circuit board under test；
Pumping signal is applied to two circuit boards by step 102) at the same time, and gathers each corresponding element device nodes of two circuit boards
Response signal, extract the indicatrix of each node port response signal, i.e. lissajouf figure on this basis；
Step 103) is bent by the response signal feature for comparing faultless circuit plate and each component node of circuit board under test
Line carries out fault detect positioning, determines that circuit board under test whether there is failure, and determine abort situation.
Wherein, the step 101) further includes：
Step 101-1) each source measuring unit module of initialization, configure two sources with identical voltage source running parameter and survey
Unit module is measured, wherein the voltage source running parameter includes：Waveform, voltage or frequency；
Step 101-2) two source measuring unit modules of configuration and voltage gear non-colinear position output impedance；
The step 102) further includes：
Step 102-1) according to voltage source running parameter calculating scanning voltage array, determine the total points of scanning, and setting is swept
Described point number initial value；
Step 102-2) the corresponding scanning voltage of number of scan points is chosen, and export scanning voltage；
Step 102-3) under scanning voltage excitation, faultless circuit plate and circuit board under test correspond to component section for collection
The output voltage and operating current of point port, and record collection value；
Step 102-4) increment operator processing is carried out to number of scan points；
Step 102-5) judge whether number of scan points reaches the maximum of scanning voltage array, if it is not, then return to step
102-2)；If so, entering step 102-6)；
Step 102-6) drawn according to each scanning element characteristic of collection and show faultless circuit plate and circuit under test
The Li Shayu waveforms of plate corresponding element device nodes, and then obtain contrast oscillogram；
Step 102-7) value for contrasting tolerance is set；
Step 102-8) judge contrast oscillogram maximum difference whether in the tolerance of setting, if,
Circuit board under test fault-free；If not in the range of the tolerance of setting, the current institute's survey component node of circuit board under test
There are failure.
Source measuring unit module can only export single discrete voltage signal, therefore pass through testing control module second voltage
Source control submodule controls it to be sequentially output each scanning voltage point on waveform, forms excitation waveform and acts on tested electricity successively
Road board component node.By taking sinusoidal waveform as an example, the number of scan points for forming waveform is calculated according to the frequency of sinusoidal waveform first,
The frequency range of apparatus of the present invention scanning voltage waveform is 10Hz~1MHz, chooses the principle that scanning is always counted and is：According to scanning
The scanning voltage waveform that voltage array is drawn out is undistorted, and during the collection of the whole waveform of source measuring unit module scans completion
Between be no more than 5s, in the range of the stand-by period that user can bear, the frequency of number of scan points=100000/ is defined according to frequency range
Rate.Comprehensive waveform, amplitude, frequency and number of scan points, calculate the waveform voltage array of pumping signal.
User when carrying out circuit board contrast test can self-defined tolerance as needed scope 1%~99%, when without reason
Within range of tolerable variance, upper strata test application software judges the maximum difference of barrier circuit board curve and circuit board under test curve automatically
The current component node test of circuit board under test is qualified, otherwise unqualified.
Fig. 5 is that the present invention automatically configures Unit selection test and excitation signal amplitude/frequency principle process schematic diagram.Test control
Molding block selects each gear amplitude and frequency to produce pumping signal one by one by incremental manner, and controls each gear pumping signal most
Big value acts on circuit-under-test plate, while by the current signal collected compared with selected reference current value, as
Basis is as the foundation that pumping signal amplitude and frequency are selected under automatic mode.Since circuit is acted on be subject to inductance, capacitance, ring
Induction signal feature is also acted in addition to the influence of excited target signal amplitude be subject to signal frequency, therefore is automatically configuring pattern
Under pumping signal amplitude and frequency are required to automatically select.Selection course is between each gear using the side for souning out selection
Formula, the response signal size of prediction circuit.
Respectively by taking 5 gears are set as an example, signal amplitude first is arranged to gear 1 for amplitude and frequency, signal frequency also from
Gear 1 starts, and judges to test whether dot circuit response signal electric current meets the requirements, if being unsatisfactory for requiring, increasing frequency
Gear, and so on, until set of frequency to gear 5, if response signal is unsatisfactory for requiring, the incremental gear of amplitude,
Judge the response signal of each gear frequency successively again, until response signal meets test request, find and test optimal amplitude shelves
Position and frequency gear, produce test and excitation signal, act on circuit-under-test board component node, and collecting test result is drawn automatic
Lissajouf figure under configuration mode, and graphic difference contrast is carried out, judge whether in the range of tolerable variance of definition.
The foregoing is merely the specific embodiment of the present invention, is not intended to limit the scope of the present invention, this
Field it will be appreciated by the skilled person that on the premise of inventive principle is not departed from, modify to technical scheme or
Person's equivalent substitution, without departure from the spirit and scope of technical solution of the present invention, it should all cover in protection scope of the present invention.
Claims (9)
1. the offline contrast test device of a kind of circuit board based on lissajouf figure, it is characterised in that the circuit board is right offline
Included than test device：Intelligent terminal, two source measuring unit modules and testing control module；
Wherein, described two source measuring unit modules are located in two PXIe grooves positions of intelligent terminal, the testing control module
Installation and operation is on intelligent terminal；
Each source measuring unit module further includes：First voltage source submodule, the first output impedance submodule and monitoring
Module, the first voltage source submodule are used to provide the four-quadrant driving voltage signal output for including remote sensing；The output resistance
Anti- submodule is used to be matched with the impedance on circuit-under-test board component node line, the distribution of balanced driving voltage；Institute
Monitoring submodule is stated to be used to monitor real work voltage and output current of the loading in measured device port in real time；
The testing control module further includes：The second voltage source control submodule, the second output impedance control submodule and
Display sub-module is measured, wherein, the second voltage source control submodule is used for the first voltage of voltage input measuring unit module
The pumping signal of the configurable form of source submodule output, the pumping signal further comprise sine wave, square wave, triangular wave and saw
Tooth ripple, and each wave-shape amplitude and frequency using gear configuration by the way of, without intersection between each gear；Second output impedance
Control submodule is used for the matching impedance size for controlling the first output impedance submodule, is additionally operable to control circuit-under-test board component
Impedance on node circuit is matched, and the gear of each matching impedance corresponds to the amplitude gear of a pumping signal；Institute
State the corresponding element that measurement display sub-module shows faultless circuit plate and circuit board under test by way of lissajouf figure contrast
The contrast test result of device nodes.
2. the offline contrast test device of the circuit board according to claim 1 based on lissajouf figure, it is characterised in that institute
Measurement display sub-module is stated to further include：Measurement submodule and mode of learning submodule in real time；
The measurement submodule in real time, for faultless circuit plate and the corresponding component node of circuit board under test to be added at the same time
Scanning and excitation test is carried, and gathers the response characteristic signal of component node port in real time, is shown according to collection result in measurement
Submodule draws Li Shayu comparative patterns；
The mode of learning submodule, for extracting faultless circuit board component section from the data record that intelligent terminal stores
The indicatrix of point, and the test result curve of component node corresponding to circuit board under test carries out graphics Web publishing, according to contrast
Testing differentia size judges that circuit board under test has fault-free；Wherein, the reference data of mode of learning is：To faultless circuit plate
Key components node tested, and using test result as corresponding component node port diagnostic curve carry out data
Storage.
3. the offline contrast test device of the circuit board according to claim 1 based on lissajouf figure, it is characterised in that when
When carrying out contrast test to faultless circuit plate and circuit board under test, two component nodes apply pumping signal waveform,
The size of amplitude, frequency and matching impedance uses identical configuration.
4. the offline contrast test device of the circuit board according to claim 1 based on lissajouf figure, it is characterised in that institute
The second voltage source control submodule is stated also to include：Manual configuration unit and automatically configure unit；
Wherein, the manual configuration unit sets the amplitude, frequency and matching impedance of pumping signal to produce by artificial selection
Pumping signal, acts on circuit-under-test board component node；The unit that automatically configures is selected one by one by gear incremental manner
Each gear amplitude and frequency produce pumping signal, simultaneous selection and the corresponding matching impedance of amplitude gear, control each gear to swash
The maximum for encouraging signal amplitude acts on circuit-under-test plate, by the current signal collected compared with reference current value, with
As the foundation for automatically configuring Unit selection pumping signal amplitude and frequency based on this.
5. a kind of offline contrast test method of circuit board based on lissajouf figure, the method include：
Step 101) generation test faultless circuit plate and the required pumping signal of circuit board under test；
Pumping signal is applied to two circuit boards by step 102) at the same time, and gathers the sound of each corresponding element device nodes of two circuit boards
Induction signal, extracts the indicatrix of each node port response signal, i.e. lissajouf figure on this basis；
Step 103) by compare the response signal indicatrix of faultless circuit plate and each component node of circuit board under test into
Row fault detect positions, and determines that circuit board under test whether there is failure, and determine abort situation.
6. the offline contrast test method of the circuit board according to claim 5 based on lissajouf figure, it is characterised in that institute
Step 101) is stated to further include：
Step 101-1) each source measuring unit module of initialization, it is single to configure two source measurements with identical voltage source running parameter
Element module, wherein the voltage source running parameter includes：Waveform, voltage or frequency；
Step 101-2) two source measuring unit modules of configuration and voltage gear non-colinear position output impedance.
7. the offline contrast test method of the circuit board according to claim 5 based on lissajouf figure, it is characterised in that institute
Step 102) is stated to further include：
Step 102-1) according to voltage source running parameter calculating scanning voltage array, determine the total points of scanning, and scanning element is set
Several initial values；
Step 102-2) the corresponding scanning voltage of number of scan points is chosen, and export scanning voltage；
Step 102-3) collection in step 101-2) choose scanning voltage excitation under, faultless circuit plate and circuit board under test
The output voltage and operating current of corresponding element device nodes port, and record collection value；
Step 102-4) increment operator processing is carried out to number of scan points；
Step 102-5) judge whether number of scan points reaches the maximum of scanning voltage array, if it is not, then return to step 102-
2)；If so, entering step 102-6)；
Step 102-6) drawn according to each scanning element characteristic of collection and show faultless circuit plate and circuit board under test pair
The Li Shayu waveforms of component node are answered, and then obtain contrast oscillogram；
Step 102-7) value for contrasting tolerance is set；
Step 102-8) judge contrast oscillogram maximum difference whether in the tolerance of setting, if to be measured
Circuit board fault-free；If not in the range of the tolerance of setting, the current institute's survey component node of circuit board under test exists
Failure.
8. the offline contrast test method of the circuit board according to claim 7 based on lissajouf figure, it is characterised in that institute
The value for stating tolerance is arranged to 20%.
9. the offline contrast test method of the circuit board according to claim 7 based on lissajouf figure, it is characterised in that institute
Following condition need to be met by stating the principle for choosing and scanning and always counting：
1) the scanning voltage waveform drawn out according to scanning voltage array is undistorted；
2) acquisition time of the whole waveform of source measuring unit module scans completion is no more than 5s；
3) in the range of the stand-by period that user can bear.
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| CN201510991907.3A CN105445652B (en) | 2015-12-24 | 2015-12-24 | A kind of offline contrast test device and method of circuit board based on lissajouf figure |
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