CN201156069Y - Empty circuit board testing device - Google Patents
Empty circuit board testing device Download PDFInfo
- Publication number
- CN201156069Y CN201156069Y CNU2008200430546U CN200820043054U CN201156069Y CN 201156069 Y CN201156069 Y CN 201156069Y CN U2008200430546 U CNU2008200430546 U CN U2008200430546U CN 200820043054 U CN200820043054 U CN 200820043054U CN 201156069 Y CN201156069 Y CN 201156069Y
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- CN
- China
- Prior art keywords
- circuit
- circuit board
- differential amplifier
- sensing
- under test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a circuit bare board testing device, which comprises a sensing group, a first differential amplifier and a second differential amplifier. The sensing group comprises a sensing circuit board and a reference resistor connected with the sensing circuit board in series, and the other end is grounded to form a current circuit; the input end of the first differential amplifier is connected with the both ends of the reference resistor to acquire the signal transmitted through the sensing circuit board; the input end of the second differential amplifier is connected with the other end of the circuit board to be tested, which is closed to the sensing circuit board; when a signal source is connected with the circuit of the circuit board to be tested, signals are output through the output ends of the first differential amplifier and the second differential amplifier to jointly detect whether the circuit of the circuit board to be tested is normal; through the connection between the sensing group and the two differential amplifiers, the capacitance between the sensing circuit board and the circuit board to be tested can be effectively calculated, the broken circuit, the short circuit and the micro short circuit for the PCB can be accurately judged further, and even if the node points are closely distributed, the testing can be available.
Description
Technical field
Whether normal the utility model relates to test structure in the board production manufacture process, refers in particular to a kind of circuit hollow plate proving installation, be meant furthermore a kind ofly can detect the overstocked circuit of distribution on the circuit board circuit hollow plate proving installation.
Background technology
At present, circuit board (PCB) is just along integrated, the highly dense trend development of height, the general acupuncture treatment mode that adopts of traditional circuit hollow plate test is tested, and it uses probe to plant pin at each branch and the node of hollow plate, utilizes tester to be connected with probe again, to each branch and node is opened a way or the test of short circuit, so can have the manufacturing cost height, difficulty is big, defectives such as distribution complexity, thereby cause and to test effectively, brought puzzlement in the production run in the industry.
The utility model content
The utility model is at the existing disappearance of above-mentioned prior art, and fundamental purpose is to provide a kind of circuit hollow plate proving installation that utilizes the induction test mode to detect various overstocked circuits.
For realizing above-mentioned purpose, the utility model is taked following technical scheme:
A kind of circuit hollow plate proving installation comprises the sensing group and first differential amplifier and second differential amplifier, and this sensing group comprises a sensing circuit plate and a reference resistance of connecting with the sensing circuit plate, and this reference resistance other end ground connection forms current return; The input end of above-mentioned first differential amplifier connects the reference resistance two ends, to obtain the signal that the sensing circuit plate transmits; The input end of above-mentioned second differential amplifier is connected to the circuit of the circuit board under test of sensing circuit plate and holds in addition; When passing to signal source on the circuit to circuit board under test, whether the circuit that is detected circuit board under test by the output terminal output signal of above-mentioned first differential amplifier and second differential amplifier jointly is normal.
The circuit of above-mentioned circuit board under test is provided with channel switch, and the input end of serial connection to second differential amplifier opened and held in addition to this passage.
The utility model advantage is by the winding between sensing group and two differential amplifiers, can calculate the electric capacity between the circuit of sensing circuit plate and circuit board under test effectively, and then can be exactly to PCB open circuit, short circuit, micro-short circuit judge, even its node distributes and overstockedly still can detect.
Description of drawings
Fig. 1 is the circuit diagram of the utility model;
Fig. 2 is the equivalent circuit diagram of the utility model test both opens;
Fig. 3 is the equivalent circuit diagram of the utility model test short circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
See also Fig. 1 to shown in Figure 3, a kind of circuit hollow plate proving installation comprises sensing group and first differential amplifier (2) and second differential amplifier (3), wherein:
This sensing group comprises a sensing circuit plate (11) and a reference resistance (12) of connecting with sensing circuit plate (11), and this reference resistance (12) other end ground connection forms current return;
The input end (21) of above-mentioned first differential amplifier (2) connects reference resistance (12) two ends, to obtain the signal that sensing circuit plate (11) transmits.
The input end (31) of above-mentioned second differential amplifier (3) is connected to the circuit (5) of the circuit board under test (4) of sensing circuit plate (11) and holds in addition.And second differential amplifier (3) other end (32) is connected on sensing circuit plate (11) and the circuit that reference resistance (12) is connected in series.
When to circuit board under test) 4) circuit (5) on when passing to signal source (6), whether the circuit (5) that is detected circuit board under test (4) by above-mentioned first differential amplifier (2) and both output terminals of second differential amplifier (3) (22,33) output signal jointly normal.
The circuit (5) of above-mentioned circuit board under test (4) is provided with channel switch (7), and this passage is opened also (7) and held the input end of serial connection to second differential amplifier (3) in addition.
The decision method of the utility model line broken circuit: as Fig. 1, the signal that sensing circuit plate (11) is measured forms current return over the ground through reference resistance (12), therefore, an alternating voltage is just arranged on the reference resistance (12), amplifying, deliver to AD converter and carry out analog to digital conversion through first differential amplifier (2).By this, can do detection to the overstocked circuit board of circuit (5) distribution, feed the circuit (5) of circuit board under test (4) through the signal source, sensing circuit plate (11) is pressed close to circuit board under test (4) other end, and can simply know to record by first differential amplifier (2) and deliver to AD switching signal V2, the AD switching signal V1 that is obtaining through second differential amplifier (3), according to Z=1/2 * ∏ * F * C, can calculate the electric capacity between the circuit of sensing circuit plate and circuit board under test, thereby judge whether circuit opens a way/short circuit, wherein signal test calculating process is as follows: can calculate the electric current I=V in the series loop earlier
2/ R
L, calculate Z by formula again
C=V
1÷ I) in conjunction with the formula of above-mentioned electric current I, i.e. Z
C=V
1* R
L÷ V
2), R wherein
LBe known direct current resistance impedance, then according to formula Z
C=1/2 * ∏ * F * C can learn electric capacity C=1/2 * ∏ * F * Z
C
For another example, when circuit 5c exists under the open circuit conditions, can produce an electric capacity (C at cut-off point
X), so test loop is equivalent to Fig. 2, wherein, can get C=(C according to the crosstalk appearance
X* C
Y) ÷ (C
X+ C
Y), by this, because C
XVery little, so the C value is also just little, can judge that so circuit is an open-circuit condition; When there is short circuit in line chart, will equivalence become Fig. 3, establish R=10M Ω when wherein supposing (5a, 5b, 5d) short circuit of circuit among Fig. 1 or micro-short circuit, test frequency is 10KHZ, capacitor C
X=1pf, then electric capacity W
C=1/2 * ∏ * F * C
X=16M Ω; Based on above-mentioned principle will be exactly to PCB open circuit, short circuit, micro-short circuit judge, even its node distributes and overstockedly still can detect.
The utility model design focal point is by the winding between sensing group and two differential amplifiers, can calculate the electric capacity between the circuit of sensing circuit plate and circuit board under test effectively, and then can be exactly to PCB open circuit, short circuit, micro-short circuit judge, even its node distributes and overstockedly still can detect.
The above, it only is the preferred embodiment of a kind of circuit hollow plate of the utility model proving installation, be not that technical scope of the present utility model is imposed any restrictions, so every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any trickle modification, equivalent variations and modification that above embodiment did.
Claims (2)
1, a kind of circuit hollow plate proving installation, it is characterized in that: comprise the sensing group and first differential amplifier and second differential amplifier, this sensing group comprises a sensing circuit plate and a reference resistance of connecting with the sensing circuit plate, and this reference resistance other end ground connection forms current return; The input end of above-mentioned first differential amplifier connects the reference resistance two ends, to obtain the signal that the sensing circuit plate transmits; The input end of above-mentioned second differential amplifier is connected to the circuit of the circuit board under test of sensing circuit plate and holds in addition; When passing to signal source on the circuit to circuit board under test, whether the circuit that is detected circuit board under test by the output terminal output signal of above-mentioned first differential amplifier and second differential amplifier jointly is normal.
2, circuit hollow plate proving installation according to claim 1, it is characterized in that: the circuit of above-mentioned circuit board under test is provided with channel switch, and the input end of serial connection to second differential amplifier opened and held in addition to this passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200430546U CN201156069Y (en) | 2008-01-21 | 2008-01-21 | Empty circuit board testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200430546U CN201156069Y (en) | 2008-01-21 | 2008-01-21 | Empty circuit board testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201156069Y true CN201156069Y (en) | 2008-11-26 |
Family
ID=40103850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200430546U Expired - Fee Related CN201156069Y (en) | 2008-01-21 | 2008-01-21 | Empty circuit board testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201156069Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129004A (en) * | 2011-01-24 | 2011-07-20 | 苏州瀚瑞微电子有限公司 | Method for testing open circuit on PCB |
| CN102148487A (en) * | 2011-01-28 | 2011-08-10 | 深圳市大族激光科技股份有限公司 | Fusing device for printed circuit board (PCB) short-circuit power supply and control method thereof |
| CN105079851A (en) * | 2015-07-10 | 2015-11-25 | 深圳康源佳科技发展有限公司 | Manufacturing method of planar array type gold-plated needle negative oxygen ion particle flow emitter |
| CN105259463A (en) * | 2015-11-06 | 2016-01-20 | 天津普林电路股份有限公司 | A high density laminated board copper clad line short circuit point and trip point test method |
| CN105548860A (en) * | 2015-12-09 | 2016-05-04 | 中山市惠亚线路版有限公司 | Electric performance testing method for carbon oil circuit board |
| CN107817438A (en) * | 2017-09-15 | 2018-03-20 | 郑州云海信息技术有限公司 | A kind of golden finger interface of simulating aoxidizes the method for testing and device for causing hardware error |
-
2008
- 2008-01-21 CN CNU2008200430546U patent/CN201156069Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129004A (en) * | 2011-01-24 | 2011-07-20 | 苏州瀚瑞微电子有限公司 | Method for testing open circuit on PCB |
| CN102148487A (en) * | 2011-01-28 | 2011-08-10 | 深圳市大族激光科技股份有限公司 | Fusing device for printed circuit board (PCB) short-circuit power supply and control method thereof |
| CN102148487B (en) * | 2011-01-28 | 2013-09-04 | 深圳市大族激光科技股份有限公司 | Fusing device for printed circuit board (PCB) short-circuit power supply and control method thereof |
| CN105079851A (en) * | 2015-07-10 | 2015-11-25 | 深圳康源佳科技发展有限公司 | Manufacturing method of planar array type gold-plated needle negative oxygen ion particle flow emitter |
| CN105259463A (en) * | 2015-11-06 | 2016-01-20 | 天津普林电路股份有限公司 | A high density laminated board copper clad line short circuit point and trip point test method |
| CN105548860A (en) * | 2015-12-09 | 2016-05-04 | 中山市惠亚线路版有限公司 | Electric performance testing method for carbon oil circuit board |
| CN107817438A (en) * | 2017-09-15 | 2018-03-20 | 郑州云海信息技术有限公司 | A kind of golden finger interface of simulating aoxidizes the method for testing and device for causing hardware error |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 Termination date: 20130121 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |