如何判断三极管的好坏

如何判断三极管的好坏 用数字万用表，表笔一端接基极，表笔另一端接集电极或发射极。 1。若阻值无穷大，红表笔接基极为PNP管，黑表笔接基极为NPN管。 2。若阻值小，红表笔接基极为NPN管，黑表笔接基极为PNP管。 如用万用表测试三极管 1、 判别基极和管子的类型 选用欧姆档的R*100(或R*1K)档，先用红表笔接一个管脚，黑表笔接另一个管脚，可测出两个电阻值，然后再用红表笔接另一个管脚，重复上述步骤，又测得一组电阻值，这样测3次，其中有一组两个阻值都很小的，对应测得这组值的红表笔接的为基极b，且管子是PNP型的;反之，若用黑表笔接一个管脚，重复上述做法，若测得两个阻值都小，对应黑表笔为基极b，且管子是NPN型的。 2、判别集电极 h:M O(h$J(Z 因为三极管发射极e和集电极c正确连接时电流放大系数β大(表针摆动幅度大)，反接时β就小得多。因此，先假设一个集电极c，用欧姆档连接，(对NPN型管，发射极接黑表笔，集电极c接红表笔)。测量时，用手捏住基极b和假设的集电极c，两极不能接触，若指针摆动幅度大，而把两极对调后指针摆动小，则说明假设是正确的，从而确定集电极c和发射极e。 3、 电流放大系数β的估算 l L.I W8J W r5w/j,r 用MF47等具有“β或hFE"档的万用表测量:万用表置于“hFE”档，将三极管插入测量插座(基极插入b孔，另两管脚随意插入)，the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( ). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy 记下β读数。再将另两管脚对调后插入，也记下β读数。两次测量中，β读数大的那一次管脚插入是正确的。测量时需注意NPN管和PNP管应插入各自相应的插座。:h:m A a;G M s 若万用表上没有hFE插孔，选用欧姆档的R*100(或R*1K)档。对NPN型管，红表笔接发射极，黑表笔接集电极，测量时，只要比较用手捏住基极和集电极(两极不能接触)，和把手放开两种情况小指针摆动的大小，摆动越大，β值越高。 4、硅管、锗管的判别 @&N/` }5d p es%z V 硅管和锗管在特性上有很大不同，使用时应加以区别。我们知道，硅管和锗管的PN结正向电阻是不一样的，即硅管的正向电阻大，锗管的小。利用这一特性就可以用万用表来判别一只晶体管是硅管还是锗管。 %Q g \ `'S e 将万用表拨到R*100挡或R*1K挡。测量NPN型的三极管时，万用表的负端接基极，正端接集电极或发射极;测量PNP型的三极管时，万用表的正端接基极，负端接集电极或发射极。 按上述接好后，如果万用表的表针指示在表盘的右端或靠近满刻度的位置上(即阻值较小)，那么所测的管子是锗管;如果万用表的表针在表盘的中间或偏右一点的位置上(即阻值较大)，那么所测的管子是硅管。 6W-W IX*Z!| R2P 5、高频管和低频管的判别/x l*l |8U L9} ` _0e 高频管和低频管因其特性和用途不同而一般不能互相代用。这里介绍如何用万用表来快速判别高频管与低频管。判别方法为: the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy y G%L$Q$V5B K%S 首先用万用表测量三极管发射极的反向电阻，如果是测量PNP型管，万用表的负端接基极，正端接发射极;如果是测量NPN型管，万用表的正端接基极，负端接发射极。然后用万用表的R*1KΩ挡测量，此时万用表的表针指示的阻值应当很大，一般不超过满刻度值的1/10。再将万用表转换到R*10KΩ挡，如果表针指示的阻值变化很大，超过满刻度值的1/3，则此管为高频管;反之，如果万用表转换到R*10KΩ挡后，表针指示的阻值变化不大，不超过满刻度值的1/3，则所测的管子为低频管。用机械万用表，则结果与用数字万用表相反 怎么用万用表测二极管、发光二极管和三极管的好坏啊 问题补充:能在详细点吗,,,, 普通二极管的检测(包括检波二极管、整流二极管、阻尼二极管、开关二极管、续流二极管)是由一个PN结构成的半导体器件，具有单向导电特性。通过用万用表检测其正、反向电阻值，可以判别出二极 管的电极，还可估测出二极管是否损坏。 1(极性的判别 将置于R×100档或R×1k档，两表笔分别接二极管的两个电极，测出一个结果后，对调两表笔，再测出一个结果。两次测量的结果中，有一次测量出的阻值较大(为反向电阻)，一次测量the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy 出的阻值较小(为正向电阻)。在阻值较小的一次测量中，黑表笔接 的是二极管的正极，红表笔接的是二极管的负极。 2(单负导电性能的检测及好坏的判断 通常，锗材料二极管的正向电阻值为1kΩ左右，反向电阻值为300左右。硅材料二极管的电阻值为5 kΩ左右，反向电阻值为?(无穷大)。正向电阻越小越好，反向电阻越大越好。正、反向电阻值相差越悬殊，说明二极管的单向导 电特性越好。 若测得二极管的正、反向电阻值均接近0或阻值较小，则说明该二极管内部已击穿短路或漏电损坏。若测得二极管的正、反向电阻值均为 无穷大，则说明该二极管已开路损坏。 3(反向击穿电压的检测 二极管反向击穿电压(耐压值)可以用晶体管直流参数测试表测量。其方法是:测量二极管时，应将测试表的“NPN/PNP”选择键设置为NPN状态，再将被测二极管的正极接测试表的“C”插孔内，负极插入测试表的“e”插孔，然后按下“V”键， 测试表即可指示出二极管的反向击穿电压值。 也可用兆欧表和来测量二极管的反向击穿电压、测量时被测二极管的负极与兆欧表的正极相接，将二极管的正极与兆欧表的负极相连，同时用(置于合适的直流电压档)监测二极管两端的电压。如图4-71所示，摇动兆欧表手柄(应由慢逐渐加快)，待二极管两端电压稳定 而不再上升时，此电压值即是二极管的反向击穿电压。 1 中、小功率三极管的检测 A 已知型号和管脚排列的三极管，可按下述方法来判断其性能好坏 the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy (a) 测量极间电阻。将置于R×100或R×1K挡，按照红、黑表笔的六种不同接法进行测试。其中，发射结和集电结的正向电阻值比较低，其他四种接法测得的电阻值都很高，约为几百千欧至无穷大。但不管是低阻还是高阻，硅材料三极管的极间电阻要比锗材料三极管的极间 电阻大得多。 (b) 三极管的穿透电流ICEO的数值近似等于管子的倍数β和集电结的反向电流ICBO的乘积。ICBO随着环境温度的升高而增长很快，ICBO的增加必然造成ICEO的增大。而ICEO的增大将直接影响管子工作的 稳定性，所以在使用中应尽量选用ICEO小的管子。 通过用电阻直接测量三极管e,c极之间的电阻方法，可间接估计 ICEO的大小，具体方法如下: 电阻的量程一般选用R×100或R×1K挡，对于PNP管，黑表管接e极，红表笔接c极，对于NPN型三极管，黑表笔接c极，红表笔接e极。要求测得的电阻越大越好。e,c间的阻值越大，说明管子的ICEO越小;反之，所测阻值越小，说明被测管的ICEO越大。一般说来，中、小功率硅管、锗材料低频管，其阻值应分别在几百千欧、几十千欧及十几千欧以上，如果阻值很小或测试时指针来回晃动，则表明 ICEO很大，管子的性能不稳定。 (c) 测量放大能力(β)。目前有些型号的具有测量三极管hFE的刻度线及其测试插座，可以很方便地测量三极管的放大倍数。先将功能开关拨至 挡，量程开关拨到ADJ位置，把红、黑表笔短接，调整调零旋钮，使指针指示为零，然后将量程开关拨到hFE位置，并使两短接the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy 的表笔分开，把被测三极管插入测试插座，即可从hFE刻度线上读出 管子的放大倍数。 另外:有此型号的中、小功率三极管，生产厂家直接在其管壳顶部标示出不同色点来表明管子的放大倍数β值，其颜色和β值的对应关 系如表所示，但要注意，各厂家所用色标并不一定完全相同。 B 检测判别电极 (a) 判定基极。用R×100或R×1k挡测量三极管三个电极中每两个极之间的正、反向电阻值。当用第一根表笔接某一电极，而第二表笔先后接触另外两个电极均测得低阻值时，则第一根表笔所接的那个电极即为基极b。这时，要注意表笔的极性，如果红表笔接的是基极b。黑表笔分别接在其他两极时，测得的阻值都较小，则可判定被测三极管为PNP型管;如果黑表笔接的是基极b，红表笔分别接触其他两极 时，测得的阻值较小，则被测三极管为NPN型管。 (b) 判定集电极c和发射极e。(以PNP为例)将置于R×100或R×1K挡，红表笔基极b，用黑表笔分别接触另外两个管脚时，所测得的两个电阻值会是一个大一些，一个小一些。在阻值小的一次测量中，黑表笔所接管脚为集电极;在阻值较大的一次测量中，黑表笔所接管脚 为发射极。 C 判别高频管与低频管 高频管的截止频率大于3MHz，而低频管的截止频率则小于3MHz，一 般情况下，二者是不能互换的。 D 在路电压检测判断法 the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy 在实际应用中、小功率三极管多直接焊接在印刷电路板上，由于元件的安装密度大，拆卸比较麻烦，所以在检测时常常通过用直流电压挡，去测量被测三极管各引脚的电压值，来推断其工作是否正常，进而判 断其好坏。 (普通发光二极管的检测 (1)用检测。利用具有×10kΩ挡的指针式可以大致判断发光二极管的好坏。正常时，二极管正向电阻阻值为几十至200kΩ,反向电阻的值为?。如果正向电阻值为0或为?，反向电阻值很小或为0，则易损坏。种检测方法，不能实地看到发光管的发光情况，因为 ×10kΩ挡不能向LED提供较大正向电流。 如果有两块指针(最好同型号)可以较好地检查发光二极管的发光情况。用一根导线将其中一块的“+”接线柱与另一块表的“-”接线柱连接。余下的“-”笔接被测发光管的正极(P区)，余下的“+”笔接被测发光管的负极(N区)。两块均置×10Ω挡。正常情况下，接通后就能正常发光。若亮度很低，甚至不发光，可将两块均拨至×1Ω若，若仍很暗，甚至不发光，则说明该发光二极管性能不良或损坏。应注意，不能一开始测量就将两块置于×1Ω，以免电流过大， 损坏发光二极管。 the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy (2)外接电源测量。用3V稳压源或两节串联的干电池及(指针式或数字式皆可)可以较准确测量发光二极管的光、电特性。为此可按图10所示连接电路即可。如果测得VF在1.4,3V之间，且发光亮度正常，可以说明发光正常。如果测得VF=0或VF?3V，且不发光，说 明发光管已坏。 1(普通发光二极管的检测 (1)用检测。利用具有×10kΩ挡的指针式可以大致判断发光二极管的好坏。正常时，二极管正向电阻阻值为几十至200kΩ,反向电阻的值为?。如果正向电阻值为0或为?，反向电阻值很小或为0，则易损坏。种检测方法，不能实地看到发光管的发光情况，因为 ×10kΩ挡不能向LED提供较大正向电流。 如果有两块指针(最好同型号)可以较好地检查发光二极管的发光情况。用一根导线将其中一块的“+”接线柱与另一块表的“-”接线柱连接。余下的“-”笔接被测发光管的正极(P区)，余下的“+”笔接被测发光管的负极(N区)。两块均置×10Ω挡。正常情况下，接通后就能正常发光。若亮度很低，甚至不发光，可将两块均拨至×1Ω若，若仍很暗，甚至不发光，则说明该发光二极管性能不良或the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy 损坏。应注意，不能一开始测量就将两块置于×1Ω，以免电流过大， 损坏发光二极管。 (2)外接电源测量。用3V稳压源或两节串联的干电池及(指针式或数字式皆可)可以较准确测量发光二极管的光、电特性。为此可按图10所示连接电路即可。如果测得VF在1.4,3V之间，且发光亮度正常，可以说明发光正常。如果测得VF=0或VF?3V，且不发光，说 明发光管已坏 现在公司面试总爱考这些,还有瓷介电容识读最好也得会哦!! 测二极管,电阻档正向通,反向截止 测发光二极管,10K档,正向微亮,反向截止 测三极管,电阻档,NPN管,黑(红)表笔接基极,红(黑)表笔接另外两极 通(PNP),其他接法均不通 磁力搅拌器 快速水分测定仪 防紫外线整理剂 快速水分测定仪 旋转粘度计 防紫外线整理剂 防静电衣服 Self-regulating valve 陶粒滤料 硫化氢检测仪 防静电衣服 防静电衣服 防紫外线整理剂 paxar碳带 松弛试验机蠕变试验机 PCB热风烤箱 操作棚 插拔力试验机 抗疲劳地垫 振荡器 the neighbouring frequency transmission planning, the system can accommodate more than more than 80 TV channels, 2 reverse channels. Taking into account the needs of e-commerce in the future, this system increase in backhaul bandwidth, take up to 4 channels. Wired TV distribution statistics following table: Wired TV information points distribution schedule-medical floor, rehabilitation floor, 1th, floor, 2nd, floor serial number a layer two layer three layer four layer five layer underground a layer underground two layer total medical floor 53 54 52 71 54 7 5 296 rehabilitation floor 7 5 5 4 4 2 27 2nd, floor 18 18 10 46 1th, floor-East floor 16 16 16 3 51 1th, floor-in the floor 21 15 12 5 53 1th, Floor-West floor 20 15 18 3 56 total 529 (3) information guide and the released system system used concentrated control, and unified management of way will sound video signal, and pictures and scroll subtitles, multimedia information through network transmission to the displayed Terminal, real-time to released visits information, and rehabilitation center image advertising, and medical common sense, and experts introduced, health life, information. and can at any time spots pictures, news, emergency notification, content, main distribution in Center of Hall, hospital handle district, Elevator Hall, public. Systems Management Server security management on the medical floor room, connect to the streaming media over a network control terminals, control terminals and display devices such as LCD TVs, LED screens and other equipment connected, the output information, system support MPEG1/2/4,WMV,AVI and other video format, supports image formats such as JPG,PNG,GIF, support DTS/AC3, MP3 MPEG1/MPEG2 MP3,WMA audio format support slide presentations ( PPT). Hours second time Kok's public security system ... Information for safe, reliable, and mature application of equipment and advanced technology to the enemy