CN204228909U - Unknown circuit mapping circuit and unknown circuit plotting board - Google Patents
Unknown circuit mapping circuit and unknown circuit plotting board Download PDFInfo
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- CN204228909U CN204228909U CN201420603498.6U CN201420603498U CN204228909U CN 204228909 U CN204228909 U CN 204228909U CN 201420603498 U CN201420603498 U CN 201420603498U CN 204228909 U CN204228909 U CN 204228909U
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Abstract
The utility model relates to Electronic Testing field, in particular to unknown circuit mapping circuit and unknown circuit plotting board.This unknown circuit mapping circuit is by being provided with the first circuit parallel with one another and second circuit, and the first circuit and second circuit are all connected with power supply and power switch, wherein second circuit comprises first interface, second interface, LED and ground end, first circuit comprises break-make pilot lamp, when the two ends of circuit-under-test access first interface and the second interface respectively time, can normal luminous by LED, or LED can not be luminous, but break-make pilot lamp L2 can be luminous, judge whether the two ends of circuit-under-test communicate, and then when not using the surveying instruments such as multimeter, the break-make situation of circuit-under-test only just can be known by the break-make of LED and break-make pilot lamp, improve the efficiency of measurement, solve deficiency of the prior art.
Description
Technical field
The utility model relates to Electronic Testing field, in particular to unknown circuit mapping circuit and unknown circuit plotting board.
Background technology
In production, life, many times cause a large amount of owing to not knowing the annexation of circuit, do not have the circuit of wiring diagram to be used, the important devices more as black box one class also cannot use again.To concrete annexation and unclear circuit (circuit board), want to obtain its concrete inside annexation, then usually need to draw out its circuit connection diagram by the mapping method of unknown circuit, to determine the formation of circuit.
At present, the method for mapping circuit plate schematic diagram mainly contains polishing method, multimeter method of testing, fixing needle-bar method of testing and flexible needle-bar method of testing etc.Polishing method needs to damage circuit kit plate completely, with high costs, is difficult to realize; Multimeter method of testing utilizes break-make principle to be applicable to ball bearing made using plate, and workload is large, and error rate is high; Fixing needle-bar method of testing is required to be each circuit-under-test plate and makes special channel plate and test procedure, and cost of investment is high, the cycle is long; Flexible needle-bar method of testing system architecture is complicated, and technical requirement is high, is not suitable for and applies on a large scale.
As can be seen here, existing unknown circuit plotting board, or mapping method is when surveying and drawing unknown circuit, inefficiency.
Utility model content
The purpose of this utility model is to provide unknown circuit mapping circuit, to solve the above problems.
Embodiments provides of the present utility model, comprising:
Break-make pilot lamp L2, power supply, LED, switch, first interface and the second interface;
Described power supply, described power switch and the first circuit connected in series, described first circuit comprises break-make pilot lamp;
Described power supply, described power switch and second circuit are connected, described first interface, described second interface, LED and ground end series connection form second circuit, described first interface is for connecting the input end of unknown circuit, and described second interface is for connecting the output terminal of unknown circuit;
When the unknown values of circuit resistances connected between described first interface and described second interface is lower than preset value, described LED is luminous, and described break-make pilot lamp L2 goes out;
When the unknown values of circuit resistances connected between described first interface and described second interface is higher than preset value, described LED is gone out, and described break-make pilot lamp L2 is bright.
Preferably, described first circuit also comprises: selector switch, silicon diode D1 and germanium diode D2;
Described break-make pilot lamp L2 and power switch are electrically connected by described silicon diode D1 or described germanium diode D2, described selector switch is connected between described break-make pilot lamp and described power switch for selecting described silicon diode D1, or selects described germanium diode D1 to be connected between described break-make pilot lamp and described power switch.
Preferably, also comprise: be connected to the current-limiting resistance R1 between described power switch and described power supply.
Preferably, described second circuit is multiple, and each described second circuit includes the described first interface of series connection, described second interface, LED and ground end;
First interface and second interface of each described second circuit are respectively used to the input end and the output terminal that are connected same unknown circuit, and each described second circuit is for connecting different unknown circuit.
Preferably, described second circuit also comprises: expansion interface, and described expansion interface is held with described first interface, described second interface, LED and ground and connected.
Preferably, also comprise: the first multimeter test port and the second multimeter test port, described first multimeter test port is between power supply and the first circuit, and described second multimeter test port is between the first circuit and described current-limiting resistance R1.
The utility model embodiment still provides unknown circuit plotting board, comprise unknown circuit mapping circuit, it is characterized in that, also comprise: DB25 interface, described DB25 interface comprises multiple stitch, one end of each stitch is electrically connected with a pin of unknown circuit, the other end and a described first interface, or a described second interface electrical connection.
The unknown circuit mapping circuit that the utility model embodiment provides, the multimeter traditional with use of the prior art carries out the method for testing, all need to use the test pencil of multimeter to snap into preposition time owing to measuring at every turn to carry out measurement and compare, it is by being provided with the first circuit parallel with one another and second circuit, and the first circuit and second circuit are all connected with power supply and power switch, wherein second circuit comprises first interface, second interface, LED and ground end, first circuit comprises break-make pilot lamp, when the two ends of circuit-under-test access first interface and the second interface respectively time, if the two ends of circuit-under-test are interconnected, so second circuit also just can form path, also LED normal luminous is just enable, if the two ends of circuit-under-test are not interconnected, that second circuit also just can only be in the state of open circuit, this time, LED can not be luminous, but break-make pilot lamp L2 can be luminous, now, also just can prove that the two ends of circuit-under-test do not communicate, and then when not using the surveying instruments such as multimeter, only just can realize measuring the break-make of unknown circuit by circuit provided by the utility model, and because the break-make only by LED and break-make pilot lamp just can know the break-make situation of circuit-under-test, improve the efficiency of measurement, solve deficiency of the prior art.
Accompanying drawing explanation
Fig. 1 shows the basic circuit diagram of unknown circuit mapping circuit provided by the utility model;
Fig. 2 shows the optimized circuit figure of unknown circuit mapping circuit provided by the utility model;
Fig. 3 shows the integration circuit diagram of unknown circuit mapping circuit provided by the utility model;
Fig. 4 shows the device position relation schematic diagram of unknown circuit plotting board provided by the utility model.
In figure, 1, power switch; 2, selector switch; 3, break-make pilot lamp; 4, the first multimeter test port; 5, instrument connection; , 6, expansion interface; 7, DB25 interface; 8, LED.
Embodiment
Also by reference to the accompanying drawings the utility model is described in further detail below by specific embodiment.The utility model example 1 provides unknown circuit mapping circuit, as shown in Figure 1, comprising:
Break-make pilot lamp L2, power supply, LED, power switch, first interface and the second interface;
Described power supply, described power switch and the first circuit connected in series, described first circuit comprises break-make pilot lamp;
Described power supply, described power switch and second circuit are connected, described first interface, described second interface, LED and ground end series connection form second circuit, described first interface is for connecting the input end of unknown circuit, and described second interface is for connecting the output terminal of unknown circuit;
When the unknown values of circuit resistances connected between described first interface and described second interface is lower than preset value, described LED is luminous, and described break-make pilot lamp L2 goes out;
When the unknown values of circuit resistances connected between described first interface and described second interface is higher than preset value, described LED is gone out, and described break-make pilot lamp L2 is bright.
By the two ends of circuit under test during use, or two pins are connected with first interface and the second interface respectively, make the electric current flowing through two pins can flow through first interface and the second interface equally.When power supply is powered to first interface, if come round between two pins being connected to the circuit under test between first interface and the second interface (circuit under test inside can be communicated with by this two pins), the electric current so sent by power supply can by the two ends of the LED in second circuit, first interface, the second interface, circuit under test, with ground end, final formation path, this also just can think that between these two pins of circuit under test be identical; Another kind of situation, if be not interconnected between these two pins, the electric current that power supply sends is merely able to by the first circuit circulation, when electric current flows through the first circuit, break-make pilot lamp L2 can be made luminous, simultaneously LED is non-luminous, now just can think circuit under test two pins between be disconnected.Namely just can confirm between two pins that circuit under test is specified, whether (internal circuits between circuit under test two pins) are paths by the break-make situation of LED light and break-make pilot lamp L2.
When unknown circuit mapping circuit provided by the utility model does not need to use, circuit should can also be quit work by powered-down switch, to stop the unnecessary waste of electric energy.
Certainly, the break-make of circuit is not absolute, time resistance as worked as the circuit between the pin of unknown circuit two ends is slightly high, LED Weak-luminescence, time now namely the resistance value of unknown circuit is higher than preset value, what now can be similar to thinks that LED is (time usual resistance value is excessive, also just can think that two ends are situations of open circuit) that knock out.The luminous degree of LED light source is also that the voltage being subject to being carried in its two ends affects, resistance value between two pins of namely specifying when circuit under test is larger, but when being also not enough to think open circuit, LED and break-make pilot lamp L2 all can be luminous, now due to the uncertainty of resistance value, whether be path between two pins being not enough to effectively determine circuit under test by observing the luminous situation of LED, now (namely LED and break-make pilot lamp L2 luminous degree and inadequate time), the resistance size between two pins can be determined by meticulousr measuring method (benefit is manually surveyed), and by judging the mode whether this resistance size exceedes predetermined threshold assert whether be in path between these two pins, whether be namely directly be connected between these 2.It should be noted that, cause the affected reason of the luminous degree of LED and break-make pilot lamp L2 just between circuit under test two pins the resistance value of circuit excessive, it is likely also LED, and/or the physical problem of break-make pilot lamp L2 itself, or due to other environment, or physical factor caused, herein, the situation of the lamplight brightness change caused due to the change of resistance value is only discussed, and the situation that other reasons causes lamplight brightness to change repeats no more.
Considering the different pressure drops of SiGe diode, when test circuit under test, can selectively select the diode of different pressure drop to measure, by using selector switch can select silicon diode place in circuit, or selecting germanium diode place in circuit.SiGe diode is manual selection (being selected by selector switch), generally selects silicon diode, by silicon diode, or germanium diode place in circuit, the impact of circuit integrity is to the size of adjustable tube voltage drop.There is the brightness can selecting germanium diode comparative analysis pilot lamp during certain test experience, the Main Function namely selecting silicon diode or germanium diode in other words contrasts, check the difference in brightness of LED and break-make pilot lamp L2, with the result obtained required for determining further.
Namely, described first circuit also comprises: selector switch, silicon diode D1 and germanium diode D2;
Described break-make pilot lamp L2 and power switch are electrically connected by described silicon diode D1 or described germanium diode D2, described selector switch is connected between described break-make pilot lamp and described power switch for selecting described silicon diode D1, or selects described germanium diode D1 to be connected between described break-make pilot lamp and described power switch.
Considering the problem of withstand voltage of break-make pilot lamp L2 and LED, in order to prevent the two from causing damaging owing to having exceeded maximum voltage, in unknown circuit mapping circuit provided by the utility model, also should include the current-limiting resistance of certain resistance.
Namely unknown circuit mapping circuit also comprises: be connected to the current-limiting resistance R1 between described power switch and described power supply.
If the resistance of current-limiting resistance R1, likely then break-make pilot lamp L2, or LED cannot normal luminous, thus have impact on the judgement of the actual break-make situation of circuit, if the resistance of current-limiting resistance R1 is too low, then cannot play the effect of current limliting, therefore the resistance of the current-limiting resistance R1 preferably individual numerical value that can change, as used rheostat, or series connection, or multiple current-limiting resistance in parallel, and control current-limiting resistance whether offering circuit by using switch, also just have adjusted the resistance of the current-limiting resistance of actual place in circuit, so just, can be controlled by the resistance of the actual place in circuit of adjustment current-limiting resistance, the actual voltage value got of current-limiting resistance, make the luminous degree of LED and break-make pilot lamp in one comparatively reasonably scope, extend the serviceable life of LED and break-make pilot lamp, and ensure that the accuracy of test.
Further, in order to the measurement circuit-under-test that efficiency is higher, especially circuit-under-test can measurement point more time, can by use multiple second circuit measure different circuit-under-tests simultaneously, with accelerate measure speed.Namely in unknown circuit mapping circuit provided by the utility model, described second circuit is multiple, and each described second circuit includes the described first interface of series connection, described second interface, LED and ground end;
First interface and second interface of each described second circuit are respectively used to the input end and the output terminal that are connected same unknown circuit, and each described second circuit is for connecting different unknown circuit.
Concrete, existing circuit-under-test is a comparatively complete integrated circuit normally, the pin of integrated circuit has multiple usually, as 8 pin, 16 pin etc., the break-make between simultaneously simultaneously can completing the corresponding interface (first interface and the second interface) of different pins access second circuit to an integrated circuit pin judges.Certainly, can also be contacts different in circuit is incorporated into first interface or the second interface, to complete the judgement of break-make situation.
In order to improve the service efficiency of unknown circuit mapping circuit, described second circuit also comprises: expansion interface, and described expansion interface is held with described first interface, described second interface, LED and ground and connected.
A unknown circuit mapping circuit and another unknown circuit mapping circuit can be made to combine by expansion interface to use, namely multiple unknown circuit mapping circuit can be worked simultaneously, to connect into more efficient metering circuit (another circuit be connected is without power-on).
Further, in order to better determine the actual numerical value of circuit under test, also comprise: the first multimeter test port and the second multimeter test port, described first multimeter test port is between power supply and the first circuit, and described second multimeter test port is between the first circuit and described current-limiting resistance R1.
By using multimeter to measure, the numerical value that resistance, magnitude of voltage etc. concrete between circuit under test amount pin are concrete can be got.
The utility model additionally provides unknown circuit plotting board, comprise the unknown circuit mapping circuit that embodiment 1 provides, also comprise: DB25 interface, described DB25 interface comprises multiple stitch, one end of each stitch is electrically connected with a pin of unknown circuit, the other end and a described first interface, or a described second interface electrical connection.
When concrete measurement, can be taken a picture to circuit board by digital camera before testing, picture is inserted in the software principle figure such as PROTEL, components and parts are numbered, and printout; Newly-built schematic diagram, is placed components and parts, and is numbered components and parts by the component locations figure printed.As in Fig. 4.
During mapping, first from circuit board terminals, then should measure integrated circuit, last measuring resistance, electric capacity, transistor etc.
During test, first power-on switch 1, by selector switch 2 by silicon diode D1, or germanium diode D2 place in circuit, and by DB25 interface 7, tested location circuit is connected with unknown circuit mapping circuit, testing needle is contacted on circuit boards on component's feet pad, if form loop between a certain sealing wire and testing needle, now break-make pilot lamp 3 (namely break-make pilot lamp L2) goes out, LED 8 (playing the LED light of indicative function) is bright, illustrate that this component's feet component's feet that sealing wire is corresponding is therewith consolidated network label, do not need sealing wire of burn-oning, when can not form loop between sealing wire and testing needle, break-make pilot lamp 3 is bright, LED 8 is gone out, illustrate that this component's feet is different from other sealing wire network labels on circuit board, now should burn-on a root bead wiring (because sealing wire and LED 8 are one-to-one relationship at this pin, preferably number by LED 8 and select sealing wire from small to large, easily pinpoint the problems when sealing wire goes offline and repair welding).
After all component's feets have all been tested, start anew successively testing needle to be contacted on component's feet pad, the LED light lighted is numbered the network numbering as this pin, is recorded in schematic diagram.If light multiple LED 8 simultaneously, the brightest one should be selected.
In test process, when between testing needle and sealing wire, resistance is very little, break-make pilot lamp goes out, and test board LED 8 is bright, now there will be this components and parts one-port label consistent, should carry out benefit and survey, take off this component testing if desired in the later stage by observation.When interval resistance <100 ohm, break-make pilot lamp glimmer or light, LED 8 is bright, now in conjunction with digital multimeter, LED 8 numbering should be added that digital multimeter voltage is as network label (measuring by the first multimeter test port 4 and the second multimeter test port).LED light as lighted is numbered 99, and digital multimeter test voltage is 1.74V, then network label is 99-1.74.When interval resistance >100 ohm, LED 8 is bright, and break-make pilot lamp is obviously bright, a root bead wiring of now should burn-oning, as different network label process.Two or more unknown circuit mapping circuit can connect together, to complete the measurement of more large-scale circuit by expansion interface 6.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. unknown circuit mapping circuit, is characterized in that, comprising:
Break-make pilot lamp L2, power supply, LED, power switch, first interface and the second interface;
Described power supply, described power switch and the first circuit connected in series, described first circuit comprises break-make pilot lamp;
Described power supply, described power switch and second circuit are connected, described first interface, described second interface, LED and ground end series connection form second circuit, described first interface is for connecting the input end of unknown circuit, and described second interface is for connecting the output terminal of unknown circuit;
When the unknown values of circuit resistances connected between described first interface and described second interface is lower than preset value, described LED is luminous, and described break-make pilot lamp L2 goes out;
When the unknown values of circuit resistances connected between described first interface and described second interface is higher than preset value, described LED is gone out, and described break-make pilot lamp L2 is bright.
2. unknown circuit mapping circuit according to claim 1, is characterized in that, described first circuit also comprises: selector switch, silicon diode D1 and germanium diode D2;
Described break-make pilot lamp L2 and power switch are electrically connected by described silicon diode D1 or described germanium diode D2, described selector switch is connected between described break-make pilot lamp and described power switch for selecting described silicon diode D1, or selects described germanium diode D1 to be connected between described break-make pilot lamp and described power switch.
3. unknown circuit mapping circuit according to claim 1, is characterized in that, also comprise: be connected to the current-limiting resistance R1 between described power switch and described power supply.
4. unknown circuit mapping circuit according to claim 2, is characterized in that, described second circuit is multiple, and each described second circuit includes the described first interface of series connection, described second interface, LED and ground end;
First interface and second interface of each described second circuit are respectively used to the input end and the output terminal that are connected same unknown circuit, and each described second circuit is for connecting different unknown circuit.
5. unknown circuit mapping circuit according to claim 1, it is characterized in that, described second circuit also comprises: expansion interface, and described expansion interface is held with described first interface, described second interface, LED and ground and connected.
6. unknown circuit mapping circuit according to claim 3, it is characterized in that, also comprise: the first multimeter test port and the second multimeter test port, described first multimeter test port is between power supply and the first circuit, and described second multimeter test port is between the first circuit and described current-limiting resistance R1.
7. unknown circuit plotting board, comprise the unknown circuit mapping circuit as described in claim 1 to 6, it is characterized in that, also comprise: DB25 interface, described DB25 interface comprises multiple stitch, one end of each stitch is electrically connected with a pin of unknown circuit, the other end and a described first interface, or a described second interface electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420603498.6U CN204228909U (en) | 2014-10-17 | 2014-10-17 | Unknown circuit mapping circuit and unknown circuit plotting board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420603498.6U CN204228909U (en) | 2014-10-17 | 2014-10-17 | Unknown circuit mapping circuit and unknown circuit plotting board |
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| Publication Number | Publication Date |
|---|---|
| CN204228909U true CN204228909U (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420603498.6U Expired - Fee Related CN204228909U (en) | 2014-10-17 | 2014-10-17 | Unknown circuit mapping circuit and unknown circuit plotting board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204228909U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556334A (en) * | 2015-09-29 | 2017-04-05 | 中国飞机强度研究所 | Portable electric flow pattern displacement transducer detection means |
| CN111613157A (en) * | 2019-02-22 | 2020-09-01 | 咸阳彩虹光电科技有限公司 | Mura repair test method of display panel, display panel and display device |
-
2014
- 2014-10-17 CN CN201420603498.6U patent/CN204228909U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556334A (en) * | 2015-09-29 | 2017-04-05 | 中国飞机强度研究所 | Portable electric flow pattern displacement transducer detection means |
| CN111613157A (en) * | 2019-02-22 | 2020-09-01 | 咸阳彩虹光电科技有限公司 | Mura repair test method of display panel, display panel and display device |
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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: 20150325 Termination date: 20171017 |
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| CF01 | Termination of patent right due to non-payment of annual fee |