CN110554273A - Detection method of PCBA short circuit point - Google Patents
Detection method of PCBA short circuit point Download PDFInfo
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- CN110554273A CN110554273A CN201910824603.6A CN201910824603A CN110554273A CN 110554273 A CN110554273 A CN 110554273A CN 201910824603 A CN201910824603 A CN 201910824603A CN 110554273 A CN110554273 A CN 110554273A
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Abstract
the invention discloses a method for detecting a PCBA short circuit point, which comprises the following steps: selecting a circuit network, setting a base point, setting a measuring point, selecting a measuring instrument, selecting accessories, measuring resistance, judging the size of the resistance, updating the measuring point according to the size of the resistance, comparing the distance between the measuring points, judging a short-circuit area, repeatedly detecting and finally concluding. The invention has the beneficial effects that: through setting up a plurality of measuring points, can be quick reduce fault range, improve detection efficiency, reduce often that the detection needs, adopt the unanimous accessory of specification, can guarantee that the influence factor of accessory is unanimous, the external influence that receives when guaranteeing different regional detection is the same, the accurate degree of detection has been improved, detect many times through setting up, it is in the same place to synthesize the testing result many times, guarantee the exactness of detection, improve and detect the rate of correctness, the while need not to investigate the short-circuit point one by one, the efficiency of detecting printed circuit board short-circuit point has been improved.
Description
Technical Field
The invention relates to the field of printed circuit board testing, in particular to a method for detecting PCBA short circuit points.
background
PCBA is short for English Printed Circuit Board + Assembly, that is to say PCB blank Board through SMT upper part, or through the whole process of DIP plug-in components, short PCBA for short, will appear because of some bad materials or short Circuit phenomenon that the craft is bad in the production run, if the electronic material quantity is numerous on the Printed Circuit Board, the conventional investigation method often examines all electronic materials on the short Circuit network one by one, this method is not only inefficient, waste time, even will damage the electronic material sometimes, it is more time-consuming to detect, therefore usually adopt the detection resistance size, then detect the short Circuit point by the method of contrasting; the conventional detection method is to divide the whole PCBA into two parts and then respectively carry out resistance detection on the two parts, but the detection speed is low, the efficiency is poor, in the conventional detection method, the specifications of selected accessories are different, the consistency of the accessories cannot be guaranteed, the conventional detection method only detects once, and the accuracy of a detection result is low.
disclosure of Invention
the invention mainly aims to provide a detection method of a PCBA short-circuit point, which can effectively solve the problems of low efficiency and price difference of detection speed deviation and low accuracy of detection results in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
A detection method of PCBA short circuit points comprises the following steps:
S1, selecting a circuit network, dividing the circuit network on the PCBA into a first circuit network and a second circuit network, and connecting components in parallel between the first circuit network and the second circuit network;
s2, setting a base point, and after step S1 is completed, setting a base point at any position on the first circuit network;
s3, setting a measuring point, setting one end of a second circuit network as a first measuring point, setting the other end of the second circuit network as a second measuring point, and setting a third measuring point at the middle position between the first measuring point and the second measuring point;
s4, selecting a measuring instrument, and selecting a related instrument required for detecting the resistance after the step S3 is completed;
S5, selecting accessories, namely selecting connecting wires with the same specification and selecting accessories such as chucks required by a connecting instrument after the step S4 is finished;
s6, measuring the resistance, connecting the connecting line to each measuring point and the base point, connecting the connecting line with the measuring instrument, measuring the resistance between each measuring point and the base point by using the measuring instrument, and recording the measured resistance;
S7, judging the size of the resistor, comparing the measured sizes of the resistors after the step S6 is finished, judging the size of the resistor, and selecting two smaller resistor measuring points;
S8, updating the measuring points according to the resistance, further comparing the two small resistances measured after comparison in the step S7, and setting a new measuring point at the middle position between the measuring points of the two resistances;
s9, comparing the distance between the measuring points, marking the measuring point with smaller resistance after comparison in the step S8 after the step S8 is finished, measuring the distance between the measuring point and a new measuring point, and comparing the measured value with a preset value;
S10, judging a short-circuit area, and judging the short-circuit area according to the comparison result of the step S9;
s11, repeating detection, and after the step S10 is completed, carrying out multiple detections by using a resistance measuring instrument, and recording the detection result of each time;
and S12, concluding, integrating the data recorded in the step S11, and comparing the detection results to obtain a final short-circuit point.
in step S1, a power network is selected, and a portion with no fault is set as the first circuit network, and the short-circuit point is located in the second circuit network.
In the step S3, a third measurement point is set, and the third measurement point can help to quickly narrow the range of the short-circuit point, so as to improve the detection efficiency.
And S4, selecting a measuring instrument as the universal meter, wherein the universal meter is simple to operate and consumes less time for detecting the resistance.
In the step S5, the connecting wires of the same specification are selected, so that the influence of the connecting wires on the measurement result is consistent during detection, and the accuracy of the measurement result is guaranteed.
in step S6, the resistance between the base point and the first measurement point is a first resistance, the resistance between the base point and the second measurement point is a second resistance, and the resistance between the base point and the third measurement point is a third resistance.
in step S8, the two small resistors are compared and a new measurement point is set, so that the range of the short circuit point is narrowed, and the measurement accuracy is improved.
In step S9, the preset value is the minimum distance between the components.
In the step S10, the short-circuit area is determined, if the distance between the measurement points is smaller than the preset value, the short-circuit area is the area where the short-circuit point is located, and if the distance between the measurement points is larger than the preset value, the step S6 is returned to, and the subsequent steps are sequentially performed until the short-circuit area is obtained.
In the step S11, repeated detection can obtain multiple detection results, and the multiple detection results are compared, so that the accuracy of the detection results can be ensured, and the accuracy of the detection results can be improved.
Compared with the prior art, the invention has the following beneficial effects: by arranging a plurality of measuring points, the fault range can be quickly reduced, and the detection efficiency is improved;
The accessories with the same specification are adopted, so that the consistent influence factors of the accessories can be ensured, the same influence on different areas during detection is ensured, and the detection accuracy is improved;
by setting multiple detection, multiple detection results are integrated, the detection correctness is ensured, and the detection correctness is improved.
drawings
FIG. 1 is a schematic process flow diagram of a PCBA short-circuit point detection method of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
example 1
A method for detecting a short-circuit point of a PCBA as shown in fig. 1, comprises the steps of:
S1, selecting a circuit network, dividing the circuit network on the PCBA into a first circuit network and a second circuit network, and connecting components in parallel between the first circuit network and the second circuit network;
S2, setting a base point, and after step S1 is completed, setting a base point at any position on the first circuit network;
S3, setting a measuring point, setting one end of a second circuit network as a first measuring point, setting the other end of the second circuit network as a second measuring point, and setting a third measuring point at the middle position between the first measuring point and the second measuring point;
s4, selecting a measuring instrument, and selecting a related instrument required for detecting the resistance after the step S3 is completed;
S5, selecting accessories, namely selecting connecting wires with the same specification and selecting accessories such as chucks required by a connecting instrument after the step S4 is finished;
S6, measuring the resistance, connecting the connecting line to each measuring point and the base point, connecting the connecting line with the measuring instrument, measuring the resistance between each measuring point and the base point by using the measuring instrument, and recording the measured resistance;
S7, judging the size of the resistor, comparing the measured sizes of the resistors after the step S6 is finished, judging the size of the resistor, and selecting two smaller resistor measuring points;
S8, updating the measuring points according to the resistance, further comparing the two small resistances measured after comparison in the step S7, and setting a new measuring point at the middle position between the measuring points of the two resistances;
S9, comparing the distance between the measuring points, marking the measuring point with smaller resistance after comparison in the step S8 after the step S8 is finished, measuring the distance between the measuring point and a new measuring point, and comparing the measured value with a preset value;
S10, judging a short-circuit area, and judging the short-circuit area according to the comparison result of the step S9;
s11, repeating detection, and after the step S10 is completed, carrying out multiple detections by using a resistance measuring instrument, and recording the detection result of each time;
and S12, concluding, integrating the data recorded in the step S11, and comparing the detection results to obtain a final short-circuit point.
in step S1, a power network is selected, a part with no fault is set as a first circuit network, and a short-circuit point is located in a second circuit network; in the step S3, a third measurement point is set, and the third measurement point can help to quickly narrow the range of the short-circuit point, so as to improve the detection efficiency; s4, selecting a measuring instrument as a universal meter, wherein the universal meter is simple to operate and consumes less time for detecting the resistance; in the step S5, the connecting wires of the same specification are selected, so that the influence of the connecting wires on the measurement result is consistent during detection, the accuracy of the measurement result is guaranteed, and the detection reliability is improved; in step S6, the resistance between the base point and the first measurement point is a first resistance, the resistance between the base point and the second measurement point is a second resistance, and the resistance between the base point and the third measurement point is a third resistance; in step S8, comparing the two smaller resistors and setting a new measurement point, so as to reduce the area of the short circuit point, improve the measurement accuracy, and ensure the detection accuracy; in step S9, the preset value is the minimum distance value between the components, and the preset value is used to help compare the distances between the measurement points and help the inspector determine the position of the short-circuit point; in the step S10, a short-circuit area is determined, if the distance between the measurement points is smaller than a preset value, the area is the area where the short-circuit point is located, if the distance between the measurement points is larger than the preset value, the step S6 is returned, and the subsequent steps are sequentially performed until the short-circuit area is obtained, and a calculation and determination form is adopted, so that the correctness of the detection result can be improved, and the detection efficiency can be ensured; in the step S11, repeated detection can obtain multiple detection results, and the multiple detection results are compared, so that the accuracy of the detection results can be ensured, the accuracy of the detection results can be improved, and meanwhile, point-by-point troubleshooting is not required, thereby improving the efficiency.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. a detection method of a PCBA short circuit point is characterized by comprising the following steps:
S1, selecting a circuit network, dividing the circuit network on the PCBA into a first circuit network and a second circuit network, and connecting components in parallel between the first circuit network and the second circuit network;
s2, setting a base point, and after step S1 is completed, setting a base point at any position on the first circuit network;
S3, setting a measuring point, setting one end of a second circuit network as a first measuring point, setting the other end of the second circuit network as a second measuring point, and setting a third measuring point at the middle position between the first measuring point and the second measuring point;
S4, selecting a measuring instrument, and selecting a related instrument required for detecting the resistance after the step S3 is completed;
s5, selecting accessories, namely selecting connecting wires with the same specification and selecting accessories such as chucks required by a connecting instrument after the step S4 is finished;
S6, measuring the resistance, connecting the connecting line to each measuring point and the base point, connecting the connecting line with the measuring instrument, measuring the resistance between each measuring point and the base point by using the measuring instrument, and recording the measured resistance;
S7, judging the size of the resistor, comparing the measured sizes of the resistors after the step S6 is finished, judging the size of the resistor, and selecting two smaller resistor measuring points;
S8, updating the measuring points according to the resistance, further comparing the two small resistances measured after comparison in the step S7, and setting a new measuring point at the middle position between the measuring points of the two resistances;
s9, comparing the distance between the measuring points, marking the measuring point with smaller resistance after comparison in the step S8 after the step S8 is finished, measuring the distance between the measuring point and a new measuring point, and comparing the measured value with a preset value;
S10, judging a short-circuit area, and judging the short-circuit area according to the comparison result of the step S9;
s11, repeating detection, and after the step S10 is completed, carrying out multiple detections by using a resistance measuring instrument, and recording the detection result of each time;
and S12, concluding, integrating the data recorded in the step S11, and comparing the detection results to obtain a final short-circuit point.
2. the method as claimed in claim 1, wherein the step S1 is to select a circuit network, and a portion without fault is set as the first circuit network, and the short point is located in the second circuit network.
3. The method as claimed in claim 1, wherein a third measurement point is set in step S3, and the third measurement point can help to rapidly narrow the short-circuit point and improve the detection efficiency.
4. The method for detecting the short circuit point of the PCBA as recited in claim 1, wherein the measuring instrument is selected in the step S4, the selected measuring instrument is a universal meter, and the universal meter is simple in resistance detection operation and short in time consumption.
5. the method for detecting the short circuit point of the PCBA as recited in claim 1, wherein in the step S5, the connecting wires with the same specification are selected, so that the influence of the connecting wires on the measurement result is consistent during detection, and the accuracy of the measurement result is guaranteed.
6. the method for detecting a short circuit point of a PCBA as recited in claim 1, wherein in step S6, the resistance between the base point and the first measurement point is a first resistance, the resistance between the base point and the second measurement point is a second resistance, and the resistance between the base point and the third measurement point is a third resistance.
7. the method as claimed in claim 1, wherein in step S8, the two smaller resistors are compared and a new measurement point is set, so as to reduce the area of the short circuit point and improve the measurement accuracy.
8. the method for detecting the short circuit point of the PCBA as recited in claim 1, wherein in the step S9, the preset value is a minimum spacing value between the components.
9. The method as claimed in claim 1, wherein in step S10, the short-circuit area is determined, if the distance between the measurement points is smaller than a predetermined value, the short-circuit area is the short-circuit area, if the distance between the measurement points is larger than the predetermined value, the method returns to step S6, and the subsequent steps are performed sequentially until the short-circuit area is obtained.
10. the method for detecting the short circuit point of the PCBA as recited in claim 1, wherein the detection in step S11 is repeated, the repeated detection can obtain a plurality of detection results, and the plurality of detection results are compared, so that the accuracy of the detection results can be ensured, and the accuracy of the detection results can be improved.
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| CN201910824603.6A CN110554273A (en) | 2019-09-02 | 2019-09-02 | Detection method of PCBA short circuit point |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111508858A (en) * | 2020-05-06 | 2020-08-07 | 中国电子科技集团公司第四十四研究所 | EMCCD multiplication region electrode short circuit detection method |
| CN112731111A (en) * | 2020-12-30 | 2021-04-30 | 苏州谨测检测技术服务有限公司 | Novel PCBA device failure short circuit test method |
| CN113109694A (en) * | 2021-04-12 | 2021-07-13 | 北京电子工程总体研究所 | Method for detecting and positioning short circuit point of circuit board |
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| CN113109694A (en) * | 2021-04-12 | 2021-07-13 | 北京电子工程总体研究所 | Method for detecting and positioning short circuit point of circuit board |
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Application publication date: 20191210 |