CN101226159A - Method and system for detecting circuit board pollution - Google Patents
Method and system for detecting circuit board pollution Download PDFInfo
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- CN101226159A CN101226159A CNA2007101945516A CN200710194551A CN101226159A CN 101226159 A CN101226159 A CN 101226159A CN A2007101945516 A CNA2007101945516 A CN A2007101945516A CN 200710194551 A CN200710194551 A CN 200710194551A CN 101226159 A CN101226159 A CN 101226159A
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Abstract
The invention relates to a communication device, in particular to a communication device safety check technique, which discloses a circuit board pollution check method and a relative system, for resolving the problem of prior art which is lack of quantitative check method to judge the pollution degree of circuit board to cause low accuracy. The inventive method comprises checking the surface insulated resistance value of an object circuit board, comparing the surface insulated resistance value with one resistance threshold value, while the environment relative humidity is set as humidity threshold value, judging the resistance threshold value is the minimum surface insulated resistance value higher than the value at the safe operation of the circuit board, and when the surface insulated resistance value is not higher than the resistance threshold value, judging the circuit board has surface pollution. The inventive system comprises an insulated resistance check circuit and a first comparison circuit.
Description
Technical field
The present invention relates to communication facilities, particularly the detection technique of communication facilities discloses a kind of circuit board contamination detection method and system.
Background technology
Because air pollution in recent years is more serious, dust in air is many, add the restriction of communication facilities building environment condition, the reasons such as operation, equipment room renovation and finishing of equipment supply air system, can make long-term operation continuously sophisticated electronics down to a certain extent dust in the i.e. covering within a certain period of time, when dust runs up to a certain degree, will bring negative influence to the equipment reliability service.
In addition, in recent years in order to reduce manufacturing cost and operating cost, many equipment suppliers release the outdoor version communication facilities and the electronic equipment of non-tight formula one after another, and then harmful dust inlet chamber external form communication facilities and electronic equipment are more prone to, dust is gathering on circuit board more easily in a large number, to influencing the operational reliability of these electronic equipments to a certain degree the time, can cause circuit board to lose efficacy when serious and paralysis.
In order to remove dust to improve the reliability of communication facilities or electronic equipment, the scheme of prior art has two kinds: one is charged cleaning; Two is that on-the-spot off-line cleans.
But when implementing in the prior art, because when judging whether to clean, randomness and subjectivity are too strong, so there is following shortcoming:
Because the user when judging whether to need to clean, according to length working time of equipment, the frequency of unknown cause failure rate generation or the factors such as contaminated outward appearance of circuit board, so randomness and subjectivity on judging are too strong, lacks scientific foundation;
Because subjectivity is too strong, so easily circuit board is caused too frequent cleaning.And undue frequent clean circuit board is except the cleaning cost that increases the user, not only cleaning performance is poor owing to considerable nonstandard charged cleaning engineering for what is more important, can cause damage to circuit board on the contrary, influence the normal operation of equipment, serious even cause the equipment operation paralysis, equipment is caused possible permanent damage.
Summary of the invention
Embodiments of the invention provide a kind of circuit board contamination detection method and system, randomness that exists when solving decision circuitry plate pollution level in the prior art and subjectivity too strong band come decision circuitry plate pollution level the time poor accuracy problem.
A kind of circuit board surface contamination detection method comprises the steps:
The surface insulation resistance value of testing circuit plate;
More described surface insulation resistance value and resistance threshold values, when the relative humidity of environment was setting humidity threshold values, described resistance threshold values was greater than the required minimal surface insulating resistance value of circuit board safe operation;
When being equal to or less than described resistance threshold values, this surface insulation resistance judges that described circuit board surface is polluted.
The detection system that embodiments of the invention also provide a kind of circuit board surface to pollute comprises:
The insulation resistance testing circuit is used for the surface insulation resistance value of testing circuit plate;
First comparator circuit receives the detection signal of described insulation resistance testing circuit, and is relatively obtaining judging that described circuit board surface is polluted when detected surface insulation resistance is equal to or less than the resistance threshold values.
Beneficial effect of the present invention is as follows:
1, the method for the invention is utilized the relation between circuit board surface insulation resistance and the ionic pollution degree, reach the purpose that quantizes to detect ionic pollution degree by testing circuit plate surface insulation resistance, effectively remind the user in time to carry out the cleaning of electronic equipment and communication facilities where necessary, to improve the operational reliability of electronic equipment and communication facilities;
2, simultaneously, utilize dust thickness that circuit board is dispelled the heat and cause the principle of certain influence, the serviceability temperature pick-up unit quantize to be judged the gathering thickness of dust, guarantees that the composition of dust and envionmental humidity to the surface insulation resistance influence hour, still can in time send alarm signal and remind the user;
3, technical scheme of the present invention provides the quantitative criteria of understanding the on-the-spot circuit board pollution condition of operation to equipment manufacturers, help controlling rational cleaning frequency, save maintenance expenditures, and avoid because of too frequent clean electronic equipment and communication facilities carry out the risk that switching services brings in the network operation.
Description of drawings
Fig. 1 is a circuit board pollution detection system architecture synoptic diagram of the present invention;
Fig. 2 is the synoptic diagram of the insulation resistance of communication board under different envionmental humidities;
Fig. 3 is the synoptic diagram of the insulation resistance during different dustiness under identical envionmental humidity;
Fig. 4 is a kind of circuit structure diagram according to circuit board surface insulation resistance variation monitoring pollution condition.
Embodiment
Before specifically introducing circuit board pollution detection alarm method of the present invention and system, earlier some factors that can influence judgement are described:
In fact, when judging whether to clean, can not also to judge material chemical constitution, humidity in the dust only with the contamination by dust outward appearance of equipment, specific as follows:
1, when the dust chemical constitution mainly is the undissolved material in water of neutrality, and when this area's humidity is relatively low, even higher accumulated amount is arranged on circuit board, generally can not cause equipment corrosion and initiating failure, promptly in this case, the frequency of cleaning should be lower, and the thickness that has only dust just needs cleaning during greatly to the heat radiation that may influence heater members.
2, contain the big or day and night temperature of a large amount of halogen salts and relative humidity when big when the dust chemical constitution, circuit board surface may produce condensation, at this moment, even the dust that gathers of equipment and circuit board surface is also not serious, still may cause equipment corrosion and trigger fault, at this moment not only need to clean, and may need to apply (Conformal Coating) to manage to reduce the relative humidity of device interior.
3, when in the dust seldom when corrosivity salt and environmental drying, can clean, but in the humid area, just may be because dust has great total surface area, can absorption a large amount of steam and corrosive gas and etching apparatus and influence the operational reliability of equipment, at this moment just need clean equipment.
From above analysis as can be known, because the residing environment of circuit board is very complicated,, provide objectively and the criterion of science by quantification so purpose of the present invention be cleaned for judging whether exactly exactly.
Show after deliberation: the key factor that influences the operation of circuit board reliability is the insulation resistance of circuit board surface, when insulating resistance value is too small, very easily produces noise, misoperation, even causes short circuit accident.And the variation of insulating resistance value and dustiness are directly related, after salts substances arrival in the dust that circuit board surface gathers is a certain amount of, insulating resistance value just can descend thereupon, and the salts substances that contains in the dust is many more, the circuit board surface insulating resistance value is more little, as seen, when the dirt accumulation that contains described salts substances arrives to a certain degree, must be by cleaning the insulating resistance value that guarantee circuit board surface.
Simultaneously, under identical pollutional condition, the big more then surface insulation resistance of circuit board surface relative humidity value is more little; But when causing that the low excessively main cause of face insulating resistance value is relative humidity when excessive, then can improve insulation resistance by the method that reduces circuit board surface relative humidity, needn't cleaning circuit plate surface.
Concrete following Fig. 2 of situation of change and shown in Figure 3: as shown in Figure 2, when Fig. 2 has shown identical pollutional condition, the situation of change of circuit board surface insulation resistance under different relative humidity, wherein: ordinate is the surface insulation resistance that measures, horizontal ordinate is that envionmental humidity changes, as can be known, and after circuit board gathers certain dust, envionmental humidity is big more, and the circuit board surface insulation resistance is more little.
See also Fig. 3, when envionmental humidity fixedly the time, the surface insulation resistance of circuit board reduces along with the increase of dustiness.
From above-mentioned analysis as can be known, the circuit board surface insulating resistance value changes the circuit board pollution condition that can directly reflect under the certain environment relative humidity, therefore the circuit board surface insulating resistance value can be judged pollution level as the quantized value of weighing the circuit board dustiness.
For this reason, the invention provides technical scheme, comprise step based on following ultimate principle:
1, when moving, circuit board monitors surperficial insulating resistance value;
The circuit board that is polluted easily in the monitoring equipment can be realized the detection to the entire equipment pollution condition, and the circuit board that is polluted easily generally is positioned at the air inlet place of apparatus cools wind.According to the relation between dustiness and the circuit board surface insulation resistance, measuring method is: at the position of the easiest gathering dust of each piece circuit board (or a certain feature board of each interpolation frame), promptly cool off windward side the circuit that the test surfaces insulation resistance changes is set, can use any current line pattern commonly used (parallel lines and comb electrode etc.), the surface insulation resistance testing circuit must be exposed in the air (or cooling draught), cover without welding resistance printing ink (sold mask) and other materials, otherwise can influence the variation of sensor senses dustiness.
2, whether decision circuitry plate surface insulation resistance value drops to the setting resistance threshold;
Characteristic according to electronic equipment and communication facilities is provided with the threshold value that the circuit board surface insulation resistance changes, generally speaking, be to guarantee the security performance of circuit board under each service condition, the surface insulation resistance minimum value during the highest relative humidity environment that should select that circuit board can move is this resistance threshold.For example: when relative humidity was 85%RH, when the detection spacing was 0.318mm, the surface insulation resistance minimum value should (also can indicate with leakage current skin peace PA) between 3.00E+6 Ω～1.00E+7 Ω/0.318mm.
3, when being equal to or less than the setting resistance threshold, the circuit board surface insulating resistance value reports to the police.
When reaching setting threshold, report alerting signal, generally speaking, the user can confirm to device context after receiving repeatedly alerting signal, be that too many, the relative humidity of dust is too greatly or occur condensation on the circuit board even rainy water droplet leaks on the equipment, the user can determine whether should carry out equipment cleaning, still manage to reduce the relative humidity of running environment, perhaps search the source that produces water clock, the hidden danger of the operational reliability of eliminating the effects of the act.
In some running environment of circuit board, owing to may not contain too much salts substances in the dust, therefore also little to the surface insulation resistance influence of circuit board, but at this moment influence is received in the normal heat radiation of circuit board, still needs circuit board is cleaned.Therefore come the supervisory circuit plate to be subjected to the degree of contamination by dust except employing at the sensor that the ad-hoc location on the circuit board is provided with the surface insulation resistance variation, too much can influence the principle of circuit board heat radiation according to dust, can also the ad-hoc location on circuit board temperature sensor being set detects, when dirt accumulation increases, dry dust can influence heat radiation, the temperature of temperature sensor perception is raise, a heater element is installed in the position that contacts cooling air air-flow circuit board at equipment at first, when increasing, dust can influence its heat radiation, temperature is risen, when the temperature of heater element exceeds certain threshold value than environment temperature, illustrate that dust has badly influenced heat radiation, at this moment should send alarm, remind the user need arrive field investigation, check that really to belong on the circuit board dust too many, whether decision needs to carry out the cleaning of electronic equipment and communication facilities.Temperature threshold is according to the power setting of concrete heater element, rule of thumb, and can be according to following policy setting:
1), in the environment of temperature stabilization, temperature threshold=environment temperature+1～2 degree centigrade;
2), in the unstable temperature environment, temperature threshold=environment temperature+2～5 degree centigrade.
The circuit structure of realization said method as shown in Figure 1, comprise: the comparator circuit 2 of testing circuit 1, connection detection circuit 1, connect comparator circuit 2 alarm display circuit 3 be connected the distal center supervisory circuit 4 of alarming display circuit 3 by transmission network, distal center supervisory circuit 4 general concentrating are arranged in the monitoring room of communication system, and whole communication system is carried out Centralized Monitoring.
Testing circuit 1 comprises the circuit 102 that testing circuit plate surface insulation resistance circuit 101 and detected temperatures change.Dust with the air-flow access arrangement after, be subjected to the circuit board electrostatic attraction, the overwhelming majority is met cooling air one side at circuit board and is settled down, so the contamination by dust that receive the edge zone of circuit board cooling windward side is the most serious, so testing circuit should be arranged on circuit board and meet edge zone to cooling air one side, cooling air is to shown in arrow among Fig. 1, so just can reach the purpose of monitoring entire circuit plate, pollution condition for entire equipment, owing to be in the easiest pollution of circuit board at place, air port, detect the purpose that the circuit board that is positioned at the place, air port can reach the monitoring entire equipment.
Surface insulation resistance testing circuit 101 can use any current line pattern commonly used (parallel lines turning spur or comb electrode etc.), directly in design in the cabling figure and be printed on the printed circuit board (PCB) or print and be welded on the plate after finishing at printed circuit board (PCB), surface insulation resistance testing circuit 101 must be exposed in the air (or cooling draught), not handy welding resistance printing ink (Sold Mask) and other materials cover, otherwise can influence the variation of sensor senses dustiness.Testing circuit 101 detects the required working power of surface insulation resistance and is provided by comparator circuit 2, and testing result is imported comparator circuit 2.
Surface temperature testing circuit 102, comprise permanent power heater element, diode or triode for example, and detect first temperature sensor of permanent power heater element working temperature and second temperature sensor of testing environment temperature, if be provided with the temperature sensing device of testing environment temperature in the equipment, then can directly utilize testing result to control, first temperature sensor needn't be set separately.The power heater element and first temperature sensor can be set directly at circuit board cooling windward side, also can be on the board edge position a fixedly connected insulation plate vertical with the cooling air wind direction, and permanent power heater element and temperature sensor be fixed on windward side, the testing result input comparator circuit 2 of temperature sensor is judged.
Comparator circuit 2 comprises and is used for relatively electronic circuit 201 of resistance threshold first that whether the comparison insulation resistance be lower than setting, whether exceed second electronic circuit 202 relatively of the temperature threshold of setting with the difference of working temperature that is used for the permanent power component of comparison and environment temperature, the parallel alarm display circuit 3 that is connected to of its output, when the difference that is equal to or less than the working temperature of the resistance threshold of setting or permanent power component and environment temperature when insulation resistance is equal to or higher than the temperature threshold of setting, to the alarm of alarm display circuit 3 outputting alarm signal triggering.The alarm mode can comprise sound, common type such as luminous, after warning circuit 3 is received alarm signal, is transferred to the remote monitoring center by communication network, is used for remote alarm and shows.
It is a lot of to change the circuit structure form control according to insulation resistance, is that example describes with a kind of circuit structure wherein only below:
As shown in Figure 4, Fig. 4 comprises three measuring resistance Rs for insulation resistance detects comparator circuit, and detected insulation resistance Rx constitutes electric bridge, two electrodes of a and c end difference connection detection circuit 101, test voltage V
DCBe added on a and b terminals of this electric bridge, c holds ground connection, the d terminals connect the normal phase input end of voltage comparator, the setting voltage Ur that the inverting input of voltage comparator applies is: when Rx is minimum setting threshold, the voltage of c and the output of d terminals, this setting voltage can obtain by the reality test.The course of work of circuit is: after circuit board is contaminated, insulation resistance Rx descends, the magnitude of voltage that is input to normal phase input end then raises, when in case insulation resistance Rx is lower than setting threshold, voltage comparator normal phase input end magnitude of voltage equals or exceeds setting voltage, at this moment, and the output terminal output signal of voltage comparator, control alarm display device is alarmed, for example the stand by lamp shown in the figure.
Test voltage V
DCHigh more, measuring accuracy is high more, according to the power configuration of the equipment of reality, generally selects the highest direct supply.
The implementation method of utilizing the difference of two temperature to control is a lot, can realize by the hardware circuit that voltage comparator constitutes, and also can realize by software control, for those skilled in the art know, repeats no more here.
The beneficial effect that technical scheme of the present invention is brought is as follows:
1, the method for the invention is utilized the relation between circuit board surface insulaion resistance and the ionic pollution degree, Reach the purpose that quantizes to detect ionic pollution degree by testing circuit plate surface insulation resistance, effectively reminding user In time carry out where necessary the cleaning of electronic equipment and communication equipment, to improve electronic equipment and communication equipment Operational reliability;
2, simultaneously, utilize dust thickness that heat dissipation for circuit board is caused the principle of certain influence, utilize the temperature inspection Survey the gathering thickness that device quantizes to judge dust, guarantee composition and the insulation of envionmental humidity effects on surface of dust Resistance Influence hour in time sends the alarm signal reminding user;
3, technical scheme of the present invention provides to equipment manufacturers and understands the on-the-spot circuit board pollution condition of operation Quantitative criteria, be conducive to control rational cleaning frequency, save maintenance expenditures, and avoid because of too frequently Clean electronic equipment and communication equipment and switch professional risk to what the network operation brought.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from this Bright spirit and scope. Like this, if belonging to claim of the present invention, these modifications of the present invention and modification reach The range of its equivalent technologies, then the present invention also be intended to comprise these change and modification interior.
Claims (16)
1. the detection method that circuit board surface pollutes is characterized in that, comprises the steps:
The surface insulation resistance value of testing circuit plate;
More described surface insulation resistance value and resistance threshold values, when the relative humidity of environment was setting humidity threshold values, described resistance threshold values was greater than the required minimal surface insulating resistance value of circuit board safe operation;
When being equal to or less than described resistance threshold values, this surface insulation resistance judges that described circuit board surface is polluted.
2. the method for claim 1 is characterized in that, described when this surface insulation resistance is equal to or less than described resistance threshold values, judge also comprise step after described circuit board surface is polluted: send alarm signal according to described result of determination.
3. the method for claim 1 is characterized in that, described humidity threshold values is the humidity value of the circuit board the highest relative humidity environment that can move.
4. the method for claim 1 is characterized in that, described setting humidity threshold values is less than or equal to 85%RH.
5. as claim 1 or 4 described methods, it is characterized in that when described relative humidity threshold values was 85%RH, the scope of required surface insulation resistance minimum value was 3.00E+6 Ω～1.00E+7 Ω.
6. the method for claim 1 is characterized in that, in the surface insulation resistance value of testing circuit plate, goes back the working temperature of the permanent power component in testing circuit plate surface and the environment temperature of circuit board;
Calculate the difference of described working temperature and environment temperature;
When described temperature gap is equal to or greater than the temperature threshold values of setting, judge that described circuit board surface is polluted.
7. method as claimed in claim 6 is characterized in that, described when described temperature gap is equal to or greater than the temperature threshold values of setting, judge after described circuit board surface is polluted also comprise step: send alarm signal according to described result of determination.
8. method as claimed in claim 6 is characterized in that, temperature threshold values=environment temperature+1～2 degree centigrade; Perhaps, temperature threshold values=environment temperature+2～5 degree centigrade.
9. method as claimed in claim 6 is characterized in that, the position of detecting the surface temperature of the insulation resistance of described circuit board surface and/or thermostatic element is: circuit board surface is met the edge to cooling air.
10. the detection system that circuit board surface pollutes is characterized in that, comprising:
The insulation resistance testing circuit is used for the surface insulation resistance value of testing circuit plate;
First comparator circuit receives the detection signal of described insulation resistance testing circuit, and is relatively obtaining judging that described circuit board surface is polluted when detected surface insulation resistance is equal to or less than the resistance threshold values.
11. system as claimed in claim 10 is characterized in that, the insulation resistance testing circuit is arranged on circuit board surface and meets edge zone to a side of cooling air.
12. system as claimed in claim 10 is characterized in that, described insulation resistance testing circuit is for printing or be welded on two parallel revolution cablings or the comb electrode on the circuit board.
13. system as claimed in claim 10 is characterized in that: described system also comprises:
Be arranged on the permanent power component of described circuit board surface;
Detect first temperature sensor of this perseverance power component working temperature and second temperature sensor of testing circuit plate environment temperature;
Second comparator circuit receives the detection signal of described first temperature sensor and second temperature sensor, and the difference between detected working temperature and environment temperature judges that described circuit board surface is polluted when being equal to or greater than the temperature threshold values of setting.
14. system as claimed in claim 13 is characterized in that, described permanent power component and temperature sensor are fixed on circuit board and meet a side to cooling air.
15. system as claimed in claim 13 is characterized in that, described system also comprises: warning circuit, connect described first comparator circuit and second comparator circuit, and be used for sending alarm signal according to described result of determination.
16. system as claimed in claim 15 is characterized in that, described system also comprises: connect the remote monitoring circuit of described warning circuit by communication network, be used for remote alarm and show.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101945516A CN101226159A (en) | 2005-07-29 | 2005-07-29 | Method and system for detecting circuit board pollution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101945516A CN101226159A (en) | 2005-07-29 | 2005-07-29 | Method and system for detecting circuit board pollution |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100887533A Division CN100514050C (en) | 2005-07-29 | 2005-07-29 | Method and system for detection of circuit board contamination |
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| CN101226159A true CN101226159A (en) | 2008-07-23 |
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| CNA2007101945516A Pending CN101226159A (en) | 2005-07-29 | 2005-07-29 | Method and system for detecting circuit board pollution |
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| CN102937611A (en) * | 2012-12-06 | 2013-02-20 | 华为技术有限公司 | Corrosion risk prompting method and early warning system |
| CN104065990A (en) * | 2014-03-13 | 2014-09-24 | 苏州天鸣信息科技有限公司 | Television smart remote control device based on contact sensing and remote control method thereof |
| CN104655687A (en) * | 2015-03-19 | 2015-05-27 | 重庆新原港科技发展有限公司 | Test method and test device for protective performance of electron tunneling protective agent of circuit board |
| CN105116105A (en) * | 2015-07-17 | 2015-12-02 | 深圳崇达多层线路板有限公司 | Micro-printed circuit board appearance inspection assistant device |
| CN105486722A (en) * | 2015-01-20 | 2016-04-13 | 台湾快捷国际股份有限公司 | Pollution detection circuit of data line and method |
| CN106156697A (en) * | 2015-03-30 | 2016-11-23 | 联想(北京)有限公司 | A kind of information processing method and device |
| US9677987B2 (en) | 2015-07-22 | 2017-06-13 | International Business Machines Corporation | Measurement of particulate matter deliquescence relative humidity |
| CN108226231A (en) * | 2018-01-29 | 2018-06-29 | 英华达（上海）科技有限公司 | Defect estimation system |
| CN108469407A (en) * | 2018-03-16 | 2018-08-31 | 中国石油大学(华东) | A kind of device and method of detection clean surface degree |
| CN109115836A (en) * | 2018-09-10 | 2019-01-01 | 杭州后博科技有限公司 | A kind of luggage damage detection system and method |
| CN111505531A (en) * | 2020-04-10 | 2020-08-07 | 浪潮商用机器有限公司 | Board card test system |
| CN113340919A (en) * | 2021-07-02 | 2021-09-03 | 南通海舟电子科技有限公司 | Control system of intelligent control circuit board |
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| CN102937611A (en) * | 2012-12-06 | 2013-02-20 | 华为技术有限公司 | Corrosion risk prompting method and early warning system |
| CN104065990A (en) * | 2014-03-13 | 2014-09-24 | 苏州天鸣信息科技有限公司 | Television smart remote control device based on contact sensing and remote control method thereof |
| CN105486722B (en) * | 2015-01-20 | 2019-02-05 | 台湾快捷国际股份有限公司 | The pollution detection circuit and its method of data line |
| CN105486722A (en) * | 2015-01-20 | 2016-04-13 | 台湾快捷国际股份有限公司 | Pollution detection circuit of data line and method |
| CN104655687A (en) * | 2015-03-19 | 2015-05-27 | 重庆新原港科技发展有限公司 | Test method and test device for protective performance of electron tunneling protective agent of circuit board |
| CN106156697A (en) * | 2015-03-30 | 2016-11-23 | 联想(北京)有限公司 | A kind of information processing method and device |
| CN105116105A (en) * | 2015-07-17 | 2015-12-02 | 深圳崇达多层线路板有限公司 | Micro-printed circuit board appearance inspection assistant device |
| US9677987B2 (en) | 2015-07-22 | 2017-06-13 | International Business Machines Corporation | Measurement of particulate matter deliquescence relative humidity |
| US10241021B2 (en) | 2015-07-22 | 2019-03-26 | International Business Machines Corporation | Measurement of particulate matter deliquescence relative humidity |
| CN108226231A (en) * | 2018-01-29 | 2018-06-29 | 英华达（上海）科技有限公司 | Defect estimation system |
| CN108469407A (en) * | 2018-03-16 | 2018-08-31 | 中国石油大学(华东) | A kind of device and method of detection clean surface degree |
| CN108469407B (en) * | 2018-03-16 | 2021-01-12 | 中国石油大学(华东) | Device and method for detecting surface cleanliness |
| CN109115836A (en) * | 2018-09-10 | 2019-01-01 | 杭州后博科技有限公司 | A kind of luggage damage detection system and method |
| CN114729869A (en) * | 2019-09-20 | 2022-07-08 | 西门子能源全球有限公司 | Electrical device and method for determining potential functional impairment in an electrical device |
| CN111505531A (en) * | 2020-04-10 | 2020-08-07 | 浪潮商用机器有限公司 | Board card test system |
| CN111505531B (en) * | 2020-04-10 | 2023-01-20 | 浪潮商用机器有限公司 | Board card test system |
| CN113340919A (en) * | 2021-07-02 | 2021-09-03 | 南通海舟电子科技有限公司 | Control system of intelligent control circuit board |
| CN114285350A (en) * | 2021-12-23 | 2022-04-05 | 深圳市亚加电机有限公司 | Control method and system of direct current brushless motor |
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