CN106291333B - A kind of circuit board detecting system - Google Patents
A kind of circuit board detecting system Download PDFInfo
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- CN106291333B CN106291333B CN201610885231.4A CN201610885231A CN106291333B CN 106291333 B CN106291333 B CN 106291333B CN 201610885231 A CN201610885231 A CN 201610885231A CN 106291333 B CN106291333 B CN 106291333B
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- circuit board
- under test
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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
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
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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
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention provides a kind of circuit board detecting system, by the way that circuit board under test being waited for, each electrode of binding region is immersed in test solution, utilize the conductive characteristic of test solution, realize the electrode conduction to binding region, by sending test voltage to the control unit of circuit board under test, detection circuit board under test waits for the adjacent two interelectrode impedance of binding region, and waits for the conductivity of adjacent two interelectrode impedance detection value and test solution in binding region judges whether circuit board under test is qualified according to circuit board under test；On the one hand, it is no longer necessary to quality of circuit board detection can be realized with the matched dedicated test circuit plate of circuit board under test, to reduce circuit board detecting cost；On the other hand, it as long as guaranteeing that circuit board under test waits for that each electrode of binding region is immersed in the conducting that electrode can be realized in test solution, is aligned one by one without each electrode, improves detection efficiency.
Description
Technical field
The present invention relates to field of display technology, and in particular to a kind of circuit board detecting system.
Background technique
As SMT (Surface Mount Technology, surface mounting technology) technique is widely used, according to the work
The circuit board product Quality Detection that skill is produced becomes a most important problem.
Circuit board include: FPCA (Flexible Printed Circuit Assembly, flexible circuit board finished product) and
PCBA (Printed Circuit Board+Assembly, finished printed circuit board product), existing quality of circuit board detection scheme
It need to be realized using dedicated test fixture (i.e. with the matched dedicated test circuit plate of circuit board under test).Carrying out Quality Detection
When, test circuit board waits for that each electrode of binding region needs to wait for that each electrode of binding region aligns one by one with circuit board under test, because
This detection efficiency is low, becomes the bottleneck of Quality Detection.Moreover, the circuit board under test for different model needs offer corresponding special
Test circuit board increases FPCA and PCBA product quality testing cost.
Therefore, a kind of circuit board detecting system is needed to solve the above technical problems.
Summary of the invention
The present invention aiming at the above shortcomings existing in the prior art, provides a kind of circuit board detecting system, at least portion
Decompose the problem that certainly circuit board detecting is at high cost, detection efficiency is low.
The present invention is in order to solve the above technical problems, adopt the following technical scheme that
The present invention provides a kind of circuit board detecting system, comprising: controller tests solution and holds the test solution
Container, circuit board under test wait for that each electrode of binding region is immersed in the test solution；
The controller is connected with the control unit of circuit board under test, for sending test voltage to described control unit,
So that described control unit, which detects circuit board under test according to the test voltage, waits for adjacent two interelectrode impedance in binding region,
And wait for that adjacent two interelectrode impedance detection value is sentenced in binding region according to the conductivity and circuit board under test of the test solution
Whether disconnected circuit board under test is qualified.
Preferably, the test solution is the inner wall that electrode and the container in binding region are not waited for circuit board under test
The solution chemically reacted.
Preferably, the volume of a container can accommodate multiple circuit board under test simultaneously.
Preferably, the test voltage includes first voltage and second voltage；
The controller is specifically used for, and sends first voltage signal and second voltage signal to described control unit, so that
Described control unit respectively waits for the first voltage signal and second voltage signal loading in binding region in circuit board under test
Each adjacent two electrode on；The adjacent two interelectrode impedance detection value of each group that described control unit is sent is received, respectively by institute
The adjacent two interelectrode impedance detection value of each group is stated compared with the conductivity of the test solution, and is judged according to comparison result
Whether circuit board under test is qualified.
Preferably, the controller is specifically used for, when at least one set of adjacent two interelectrode impedance detection value is greater than described
When testing the conductivity of solution, the circuit board under test open circuit is determined；When at least one set of adjacent two interelectrode impedance detection value
When less than the conductivity for testing solution, the circuit board under test short circuit is determined.
Preferably, the controller is specifically used for, when each adjacent two interelectrode impedance value is equal to the test solution
Conductivity when, determine that the circuit board under test is qualified.
Further, the circuit board detecting system further includes signal generator, the signal generator and circuit under test
The control unit of plate is connected, for sending pulse signal to described control unit, so that described control unit believes the pulse
It number loads on the electrode that circuit board under test waits in binding region；
The container waits for that the opposite inner wall of the electrode in binding region is made of metal material with the circuit board under test,
And wait for that the electrode in binding region forms electrolytic capacitor with the circuit board under test；
The controller is connected with the inner wall of the container, is also used to receive the third electricity that the electrolytic capacitor is sent
Signal u is pressed, and according to the tertiary voltage signal u and preset voltage threshold U, determines the quality etc. of the circuit board under test
Grade；Alternatively, receiving the tertiary voltage signal u that the electrolytic capacitor is sent, reception delay time t is determined, and according to the reception
Delay time t and preset time threshold T determines the quality grade of the circuit board under test, and reception delay time t is institute
State signal generator send the pulse signal time and the controller receive the tertiary voltage signal time difference.
Further, the circuit board detecting system further includes display device, the display device and the controller phase
Even, for showing the waveform or reception delay time t of the tertiary voltage signal.
Preferably, the controller is specifically used for, and calculates the difference DELTA u between tertiary voltage signal u and voltage threshold U,
Δ u=│ u-U │, calculates ratio p, p=the Δ u/U of Δ u and U, and according to p and preset quality grade threshold value Q determine it is described to
The quality grade of slowdown monitoring circuit plate；Alternatively, difference DELTA t, the Δ t=│ t-T │ between reception delay time t and time threshold T are calculated,
Ratio m, m=the Δ t/T of Δ t and T are calculated, and determines the product of the circuit board under test according to m and preset quality grade threshold value Q
Matter grade.
Preferably, the quality grade threshold value Q includes at least the first quality grade threshold value q1 and the second quality grade threshold value
q2；
The controller is specifically used for, as 0≤p < q1, alternatively, determining the quality of the circuit board under test when 0≤m < q1
Grade is excellent；As q1≤p < q2, alternatively, determining that the quality grade of the circuit board under test is medium when q1≤m < q2；Work as p
>=q2, alternatively, determining that the quality grade of the circuit board under test is difference etc. when m >=q2.
The present invention can be realized it is following the utility model has the advantages that
Circuit board detecting system provided by the invention, by the way that circuit board under test is waited for that each electrode of binding region is immersed in survey
It tries in solution, using the conductive characteristic of test solution, realizes the electrode conduction to binding region, pass through the control to circuit board under test
Unit processed sends test voltage, and detection circuit board under test waits for the adjacent two interelectrode impedance of binding region, and according to circuit under test
Plate waits for whether the conductivity of adjacent two interelectrode impedance detection value and test solution in binding region judges circuit board under test
It is qualified；On the one hand, it is no longer necessary to quality of circuit board detection can be realized with the matched dedicated test circuit plate of circuit board under test, from
And reduce circuit board detecting cost；On the other hand, as long as guaranteeing that circuit board under test waits for that each electrode of binding region is immersed in test
The conducting that electrode can be realized in solution aligns one by one without each electrode, improves detection efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of circuit board detecting system provided by the invention；
Fig. 2 is top view of the circuit board detecting system provided by the invention in the quality grade of detection circuit board；
Fig. 3 is the schematic diagram of the quality grade of detection circuit board provided by the invention.
Marginal data:
1, controller 2, container 3, test solution 4, circuit board under test
5, signal generator 41, electrode 42, control unit 21, inner wall
Specific embodiment
Below in conjunction with the attached drawing in the present invention, clear, complete description is carried out to the technical solution in the present invention, is shown
So, described embodiment is a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, those of ordinary skill in the art's every other embodiment obtained without making creative work, all belongs to
In the scope of protection of the invention.
Below in conjunction with attached drawing 1, the solution of the present invention is described in detail.
The embodiment of the present invention provides a kind of circuit board detecting system, for testing whether wiring board product quality to be measured closes
Lattice.As shown in Figure 1, circuit board under test 4 includes binding region and unbundling region, it is provided with electrode 41 in binding region, it is to be measured
Circuit board 4 is bound by the non-display area of electrode 41 and display panel in binding region and is connected, the unbundling of circuit board under test 4
Control unit 42 (i.e. control chip) is provided in area, control unit 42 is connected with each electrode 41 in binding region respectively.?
In the embodiment of the present invention, circuit board under test 4 is FPCA or PCBA.
The circuit board detecting system includes: controller 1, container 2 and test solution 3, and test solution 3 is contained in container 2
It is interior.At least one circuit board under test 4 can be accommodated in container 2, circuit board under test waits for that each electrode 41 of binding region is immersed in survey
It tries in solution 3, i.e., circuit board under test waits for that each electrode 41 in binding region is located at the liquid level of test solution 3 or less.
Controller 1 is connected with the control unit 42 of circuit board under test 4, for sending test voltage to control unit 42, with
Control unit 42 is set to wait for the impedance in binding region between adjacent two electrode 41 according to test voltage detection circuit board under test, and
According to test solution 3 conductivity and circuit board under test wait for the impedance detection value in binding region between adjacent two electrode 41 judge to
Whether slowdown monitoring circuit plate 4 is qualified.
Specifically, be provided with jack interface on circuit board under test 4, controller 1 by data line and the jack interface and to
Slowdown monitoring circuit plate 4 connects, to be connected with control unit 42.
The present invention is molten using testing by the way that circuit board under test is waited for that each electrode in binding region is immersed in test solution
The conductive characteristic of liquid realizes the electrode conduction to binding region, and by sending test electricity to the control unit of circuit board under test
Pressure, detection circuit board under test wait for adjacent two interelectrode impedance in binding region, are waited in binding region according to circuit board under test
Adjacent two interelectrode impedance detection value and the conductivity of test solution judge whether circuit board under test is qualified；On the one hand, no longer
Need to can be realized quality of circuit board detection with the matched dedicated test circuit plate of circuit board under test, to reduce circuit board detecting
Cost；On the other hand, as long as guaranteeing that circuit board under test waits for that each electrode of binding region is immersed in test solution and electricity can be realized
The conducting of pole aligns one by one without each electrode, improves detection efficiency.
Product quality in order to guarantee circuit board under test is not damaged, and the test selection of solution 3 does not wait tying up with circuit board under test
Determine the solution that the inner wall of electrode 41 and container 2 in region chemically reacts.For example, test solution can be NaCl solution,
Certainly, skilled person will appreciate that, test solution 3 is not limited to NaCl solution, any not wait for binding region with circuit board under test
The solution that the inner wall of interior electrode 41 and container 2 chemically reacts, and conductivity meets the solution of testing requirements in this hair
Within bright protection scope.
It should be noted that the conductivity of test solution 3 can need to be adjusted and be arranged according to detection, for example, can
To be realized by the concentration for changing test solution 3, proportion, before the circuit board detecting system starts, first measurement is surveyed
The conductivity of solution 3 is tried, and measurement result is stored in controller 1, is sentenced so as to subsequent as circuit board under test product quality
Disconnected foundation.
Preferably, the volume of container 2 can accommodate multiple circuit board under test 4 simultaneously, that is to say, that multiple circuit board under test
4 can be accommodated in simultaneously in container 2 to the electrode in binding region, to realize detection while multiple circuit boards.At this
In inventive embodiments, as shown in Figure 1, container 2 can accommodate 3 circuit board under test simultaneously.By the way that foot is arranged in the volume of container 2
It is enough big, multiple circuit board under test 4 can be accommodated simultaneously, to realize the synchronous detection of multiple circuit boards, further increase detection effect
Detection time is greatly decreased in rate.
Below in conjunction with Fig. 1, elaborate to the course of work of circuit board detecting system of the invention.
Controller 1 includes first voltage and second voltage to the test voltage that control unit 42 is sent, and first voltage is height
Voltage, second voltage are low-voltage.
Controller 1 is specifically used for, and sends first voltage signal and second voltage signal to control unit 42, so that control is single
Member 42 respectively waits for the first voltage signal and second voltage signal loading in circuit board under test each adjacent in binding region
On two electrodes 41；Impedance detection value between each adjacent two electrode 41 that reception control unit 42 is sent, respectively will be described each adjacent
Two interelectrode impedance detection values judge that circuit board under test is according to comparison result compared with the conductivity of test solution 3
No qualification.
That is, the control unit 42 of circuit board under test 4 is respectively by first voltage signal and second voltage signal loading
It waits on each adjacent two electrode 41 in binding region in circuit board under test, in adjacent two electrode 41, adds on an electrode 41
It carries first voltage signal (i.e. high-voltage signal), loads second voltage signal (i.e. low-voltage signal) on another electrode 41, i.e., it will be to be measured
Circuit board waits for that each electrode 41 of binding region is divided into multiple groups and is detected.Due to circuit board under test wait for it is each in binding region
Electrode 41 is immersed in the liquid level of test solution 3 hereinafter, each electrode 41 can be connected in test solution 3, in this way, control unit 42
It can be detected out the impedance between adjacent two electrode 41.The impedance detection value and preset that controller 1 sends control unit 42
The conductivity of test solution 3 compare, and can judge whether circuit board under test qualified according to comparison result.
Specifically, that is, each group is adjacent when each adjacent two interelectrode impedance value is equal to the conductivity of test solution 3
When impedance detection value between two electrodes 41 is equal with test 3 conductivity of solution, the circuit board under test is qualified.Work as at least one set
Whens impedance value and test 3 conductivity of solution between adjacent two electrode 41 do not wait, circuit board under test 4 is unqualified.
Further, in embodiments of the present invention, when controller 1 judges that circuit board under test 4 is unqualified, additionally it is possible to sentence
Disconnected underproof reason out.Specifically, controller 1 is specifically used for, the impedance detection value between at least one set of adjacent two electrode 41
When greater than the conductivity for testing solution 3,4 open circuit of circuit board under test is determined；When at least one set of adjacent two interelectrode impedance detection
When value is less than the conductivity of test solution 3,4 short circuit of circuit board under test is determined.
Further, circuit board detecting system provided in an embodiment of the present invention can also make further qualified circuit board
Detection, to determine the product quality grade of qualified circuit board.
In conjunction with shown in Fig. 2 and Fig. 3, the circuit board detecting system further includes signal generator 5, signal generator 5 with to
The control unit 42 of slowdown monitoring circuit plate 4 is connected, for sending pulse signal to control unit 42, so that control unit 42 is by the arteries and veins
It rushes on the electrode 41 that signal loading is waited in circuit board under test in binding region.
Container 2 waits for that the opposite inner wall 21 of the electrode 41 in binding region is made of metal material with circuit board under test, and
Wait for that the electrode 41 in binding region forms electrolytic capacitor (as shown in phantom in Figure 2) with circuit board under test.
Controller 1 is connected with the inner wall 21 of container 2, is also used to receive the tertiary voltage signal u that the electrolytic capacitor is sent,
And according to the tertiary voltage signal u and preset voltage threshold U, the quality grade of circuit board under test 4 is determined；Alternatively, receiving
The tertiary voltage signal u that the electrolytic capacitor is sent, determines the reception delay time t of tertiary voltage signal, and prolong according to reception
When time t and preset time threshold T, determine the quality grade of circuit board under test 4.
It should be noted that in embodiments of the present invention, the pulse signal that signal generator 5 generates is square-wave signal.When
When electrode 41 in circuit board under test binding region is immersed in test solution 3, the inner wall 21 and circuit board under test of container 2 are bound
Electrode 41 in region is oppositely arranged, and the two forms electrolytic capacitor.The pulse signal that signal generator 5 generates is loaded in electricity to be measured
On electrode 41 (i.e. a pole plate of electrolytic capacitor) in the plate binding region of road, in the inner wall 21 of container 2, (i.e. electrolytic capacitor is another
One pole plate) on generate tertiary voltage signal, tertiary voltage signal is sent to controller 1.Controller 1 can be according to third electricity
Pressure signal determines the quality grade of circuit board under test 4.
Further, the circuit board detecting system can also include display device (not being painted in figure), display device with
Controller 1 is connected, for showing the waveform or reception delay time t of the tertiary voltage signal.The reception delay time, t referred to,
Signal generator 5 send the pulse signal time and controller 1 receive the tertiary voltage signal time difference.Display
Device can be oscillograph.
Specifically, being preset with voltage threshold U or time threshold T in controller 1, voltage threshold U is the generation of signal generator 5
Pulse signal maximum voltage value.The side that time threshold T can be averaged by the testing result to multiple circuit board under test
Formula determines, in order to guarantee the accuracy of detection, in general, time threshold T is the detection knot according to 30 or more circuit board under test
What fruit was calculated.
Controller 1 can judge the quality grade of circuit board under test 4 by any one in following 2 kinds of modes:
1, according to tertiary voltage signal u and preset voltage threshold U, the quality grade of the circuit board under test is determined.
2, according to reception delay time t and preset time threshold T, the quality grade of the circuit board under test is determined.
The scheme of the quality grade of above two judgement circuit board under test 4 is described in detail individually below.
For scheme 1, controller 1 is specifically used for, and calculates the difference between tertiary voltage signal u and voltage threshold U
Δ u, Δ u=│ u-U │, calculate ratio p, p=the Δ u/U of Δ u and U, and according to p and preset quality grade threshold value Q determine to
The quality grade of slowdown monitoring circuit plate 4.
Specifically, quality grade threshold value Q is preset in controller 1, the first quality grade threshold value q1 and second is included at least
Quality grade threshold value q2, q1 < q2.The size of q1 and q2 can carry out certainly according to the requirement standard of the circuit board product quality of user
Row setting, requirement of the user to circuit board product quality is higher, then the value of q1 and q2 is smaller, and user is to circuit board product quality
Requirement it is lower, then the value of q1 and q2 is bigger.In general, q1 can be set to 3%-5%, q2 may be configured as 8%-10%.
Controller 1 is specifically used for, and as 0≤p < q1, determines that the quality grade of circuit board under test 4 is excellent；When q1≤p <
When q2, determine that the quality grade of circuit board under test 4 is medium；As p >=q2, determine that the quality grade of circuit board under test 4 is poor
Deng.
That is, p is smaller, illustrate that the size of tertiary voltage signal and voltage threshold U are closer, the production of circuit board under test
Product quality is higher.
It should be noted that the quantity of quality grade threshold value Q can determine according to actual needs, quality grade threshold value Q's
Quantity is more, then product quality grade classification is more careful.
For scheme 2, controller 1 is specifically used for, and calculates the difference between reception delay time t and time threshold T
Δ t, Δ t=│ t-T │, calculate ratio m, m=the Δ t/T of Δ t and T, and determine circuit under test according to m and quality grade threshold value Q
The quality grade of plate 4.
Controller 1 is specifically used for, and as 0≤m < q1, determines that the quality grade of circuit board under test 4 is excellent；When q1≤m <
When q2, determine that the quality grade of circuit board under test is medium；As m >=q2, determine that the quality grade of circuit board under test 4 is poor
Deng.
The present invention is not only able to detect whether circuit board is qualified by circuit kit plate detection system, additionally it is possible to detect
The quality grade of qualified circuit board, further decreases testing cost.
FPCA or PCBA circuit board is waited for that the electrode in binding region immerses in test solution by the present invention, is surveyed by allotment
The concentration of solution, the conductivity of proportion adjustment test solution are tried, and is passed through test to the control unit of FPCA or PCBA circuit board
Voltage signal can be detected out the whether qualified of FPCA or PCBA.Compared to existing test fixture, circuit board detecting of the invention
System has the advantage that
In detection process, only circuit board under test need to be immersed test solution to binding region, without contraposition, improve detection
Efficiency；Multiple circuit boards can be once tested, detection efficiency is further increased；In addition to can detecte circuit board whether other than qualification,
The voltage or reception delay that test signal can also be received by detection, detect the quality grade of qualified circuit board；The detection
System is suitable for the detection of the circuit board of various models, without the matched special test electricity of circuit board fabrication for every kind of model
Road plate reduces testing cost.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a kind of circuit board detecting system characterized by comprising controller, test solution and for hold it is described test it is molten
The container of liquid, circuit board under test wait for that each electrode of binding region is immersed in the test solution；
The controller is connected with the control unit of circuit board under test, for described control unit send first voltage signal and
Second voltage signal, so that described control unit is respectively by the first voltage signal and second voltage signal loading in electricity to be measured
Road plate waits on each adjacent two electrode in binding region；Receive the adjacent two interelectrode impedance of each group that described control unit is sent
Detected value respectively compares the adjacent two interelectrode impedance detection value of each group with the conductivity of the test solution, and
Judge whether circuit board under test is qualified according to comparison result；Wherein, when each adjacent two interelectrode impedance value is equal to the survey
When trying the conductivity of solution, determine that the circuit board under test is qualified；
It further include signal generator, the signal generator is connected with the control unit of circuit board under test, is used for the control
Unit sends pulse signal, waits in binding region so that the pulse signal is loaded on circuit board under test by described control unit
On electrode；
The container waits for that the opposite inner wall of the electrode in binding region is made of metal material with the circuit board under test, and with
The circuit board under test waits for that the electrode in binding region forms electrolytic capacitor；
The controller is connected with the inner wall of the container, is also used to receive the tertiary voltage letter that the electrolytic capacitor is sent
Number u, and according to the tertiary voltage signal u and preset voltage threshold U, determine the quality grade of the circuit board under test；Or
Person receives the tertiary voltage signal u that the electrolytic capacitor is sent, determines reception delay time t, and when according to the reception delay
Between t and preset time threshold T, determine the quality grade of the circuit board under test, reception delay time t is the signal
Generator send the pulse signal time and the controller receive the tertiary voltage signal time difference.
2. circuit board detecting system as described in claim 1, which is characterized in that the test solution be not with circuit board under test
The solution that inner wall to electrode and the container in binding region chemically reacts.
3. circuit board detecting system as described in claim 1, which is characterized in that the volume of a container can accommodate more simultaneously
A circuit board under test.
4. circuit board detecting system as described in any one of claims 1-3, which is characterized in that the controller is specifically used for,
When at least one set of adjacent two interelectrode impedance detection value is greater than the conductivity of the test solution, the circuit under test is determined
Plate open circuit；When at least one set of adjacent two interelectrode impedance detection value is less than the conductivity of the test solution, described in determination
Circuit board under test short circuit.
5. circuit board detecting system as described in claim 1, which is characterized in that it further include display device, the display device
It is connected with the controller, for showing the waveform or reception delay time t of the tertiary voltage signal.
6. circuit board detecting system as described in claim 1, which is characterized in that the controller is specifically used for, and calculates third
Difference DELTA u between voltage signal u and voltage threshold U, Δ u=│ u-U │ calculate ratio p, p=the Δ u/U of Δ u and U, and root
The quality grade of the circuit board under test is determined according to p and preset quality grade threshold value Q；Alternatively, calculate reception delay time t and
Difference DELTA t between time threshold T, Δ t=│ t-T │ calculate ratio m, m=the Δ t/T of Δ t and T, and according to m and preset
Quality grade threshold value Q determines the quality grade of the circuit board under test.
7. circuit board detecting system as claimed in claim 6, which is characterized in that the quality grade threshold value Q includes at least the
One quality grade threshold value q1 and the second quality grade threshold value q2；
The controller is specifically used for, as 0≤p < q1, alternatively, determining the quality grade of the circuit board under test when 0≤m < q1
It is excellent；As q1≤p < q2, alternatively, determining that the quality grade of the circuit board under test is medium when q1≤m < q2；As p >=q2,
Alternatively, determining that the quality grade of the circuit board under test is difference etc. when m >=q2.
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| CN201610885231.4A CN106291333B (en) | 2016-10-10 | 2016-10-10 | A kind of circuit board detecting system |
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| CN201610885231.4A CN106291333B (en) | 2016-10-10 | 2016-10-10 | A kind of circuit board detecting system |
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| CN106291333B true CN106291333B (en) | 2019-06-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106908971B (en) * | 2017-04-28 | 2019-02-01 | 南京中电熊猫平板显示科技有限公司 | The binding blocking apparatus and its binding hold-up interception method of liquid crystal display panel |
| CN107607858B (en) * | 2017-09-22 | 2020-08-28 | 信利光电股份有限公司 | Method, system and device for determining open circuit position of module and readable storage medium |
| CN109164311A (en) * | 2018-07-13 | 2019-01-08 | 智车优行科技（上海）有限公司 | Fault detection method and device, electronic equipment |
| CN110596616A (en) * | 2019-10-12 | 2019-12-20 | 上海泽丰半导体科技有限公司 | Power supply impedance test method and circuit board |
| CN116577587A (en) * | 2019-12-19 | 2023-08-11 | 深圳硅基仿生科技股份有限公司 | Electrode aging test method |
| CN113917309B (en) * | 2021-08-24 | 2024-05-24 | 北京电子工程总体研究所 | Method and system for detecting whether tool for measuring delay time of circuit board is qualified or not |
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| CN1880953A (en) * | 2006-04-22 | 2006-12-20 | 重庆大学 | Method and apparatus for layered liquid interface detection based on resistivity difference |
| CN101799495A (en) * | 2010-03-25 | 2010-08-11 | 上海交通大学 | Automatic impedance-testing system for flexible film microelectrode arrays |
| CN102753966A (en) * | 2009-12-15 | 2012-10-24 | 西班牙高等科研理事会 | Multi-Analytical Method And System Based On Impedimetric Measurements |
| CN105158570A (en) * | 2015-09-23 | 2015-12-16 | 山东玉皇新能源科技有限公司 | Simple method for testing electrical conductivity of solid electrolyte |
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| DE102009060742A1 (en) * | 2009-12-30 | 2011-07-07 | NEGELE Messtechnik GmbH, 87743 | Device for detecting a water level |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1880953A (en) * | 2006-04-22 | 2006-12-20 | 重庆大学 | Method and apparatus for layered liquid interface detection based on resistivity difference |
| CN102753966A (en) * | 2009-12-15 | 2012-10-24 | 西班牙高等科研理事会 | Multi-Analytical Method And System Based On Impedimetric Measurements |
| CN101799495A (en) * | 2010-03-25 | 2010-08-11 | 上海交通大学 | Automatic impedance-testing system for flexible film microelectrode arrays |
| CN105158570A (en) * | 2015-09-23 | 2015-12-16 | 山东玉皇新能源科技有限公司 | Simple method for testing electrical conductivity of solid electrolyte |
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