Because of locating in the low-lying area or coastal, the waterlogging of big flood causes the buried cable to be in charge of the hole silt to stop up, what if influencing trouble rushing to repair and safe operation of electric wire netting? ... Read more
Electric wire cable trade is the second leading industry second only to the completed car manufacturing industry of the car in electrical engineering and electric apparatus trade. State Bureau of Quality Testing released the Chinese electric wire cable product quality to link and supervise and spot check the data a few days ago. The result shows, use the polyvinyl chloride having a large capacity and a wide range, hands in and unites only 88.4% of qualification rate of polyethylene and 3 kinds of electric wire cable products of polyvinyl chloride flexible cable, well below the level of other key industrial products, spotting check the qualification rate and is even lower than 60% of many province and city.
It is reported, the annual output of electric wire cable trade has already topped the high point of 900 billion yuan, industry’s total scale and growth rate have already ranked the first place of the world. But it indicates, the Chinese electric wire cable qualification rate is fewer than 90% to spot check the data. In addition, the relevant person in charge of State Bureau of Quality Testing introduces, produces and can be concentrated on low end products above Chinese cable trade 90% at present, invest and research and develop 1% short of money the sales amount on average.
China’s quality testing system has already ordered to rectify and improve 97 enterprises, working conditions and 324 enterprises not in accordance with requirement which have used the raw materials not up to standard, suspend operations in order to rectify the mistakes to 79 enterprises with more serious quality problem in accordance with the law. Investigate and prosecute 43 enterprises without licences together, suspend 1259 3C certificates, cancel by 425 3C certificates, cancel 13 certificates of production licence.
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Brief introduction ... Read more
Monitoring system require the difference according to different user, the intersection of system and scale, coverage, the intersection of signal transmission and the intersection of distance, information capacity,etc. and function and quality index in the system often, and adopt different transmission means. Often demand to transmit the alarm signal, audio frequency signal, control the data signal,etc. in the monitoring system too, but it was good and bad that the picture transmitted monitoring system of the decision, it is beneath most mention. Because the amount of information of the dynamic picture signal is large, the bandwidth frequently, it is strong to monitor the real-time character, so the focal point transmitted is the transmission of the picture signal of the video. ... Read more
1.Foreword ... Read more
0 foreword ... Read more
Unless it is for complete characteristics in LT4180 power controller, it is there will be 5mA isolators mere not to integrate,it owe and press /lock excessive pressure, soft starting and ... Read more
Function of the circuit ... Read more
Summary: With the intersection of clock and improvement of speed, utilize high-speed oscillograph active to pop one’s head, it measures traditional methods that delays time to be very much difficult to win the accurate result. These pop one’s head and become a part of the high-speed signal thorough fare, and cause the distortion of the signal examined, introduce the error. Popping one’s head must also locate in the pin of the device directly, in order to dispel PCB the printed circuit board The time delay error that the lead wire length produces, satisfy and pop one’s head this one of the position and require the difficult and complicated course. The intersection of land and reflectometer when this text introduce how utilize TDR ‘ Measure and reduce the method of the error of popping one’s head, contribute to improving and transmitting and delaying time to measure the precision. ... Read more
