Integrated stranded railway signal cable implementation standard GB/ t2476-1993. Railway signal cables are suitable for transmission of railway control signals, audio signals or fixed cables for fixed installation in rated voltage ac 500V or dc 1000V or below. Product name, model, specification and scope: plastic insulation and PVC sheathed railway signal cable PTYAH; PTYA; PZYA; PTYV; PTYY,; PTY22; PTY23; (PZY02; PZY03; PZY23 PZY22) 1/0.8mm (1/1.0mm) 2-48 core is suitable for railway signal communication, fire alarm signal, telegraph and other automatic device systems with rated voltage ac 500V or dc 1000V or below. Polyethylene polythene insulation composite sheath steel tape armoured PVC sheathed railway signal cable PTYA23 PTYA22 PTY23 PTY22 PTYAH23 PZYA23 PZYA22 PZY23 PZY22 0.8 mm (1/1.0 mm) 4-61 core is fit for ac rated voltage 500 v or dc voltage 1000 v and below audio signal transmission and fixed installation of railway signal and group control automation assembly line, is of general automatic transmission railway signal, can also transmit frequency shift automatic block and business phone and other audio signal. 4, using features: cable in - 40 ℃ to + 50 ℃ environment use. Cable conductor long-term working temperature shall not exceed 70 ℃. Ordinary sheath of the cable laying under the environment temperature is not lower than 5 ℃, resistance to sheath for - 10 ℃. The bending radius shall not be less than 15 times of the outer diameter of the cable (when laying) and shall be applicable to any horizontal disturbance
计算机电缆本产品适用于电压300/500v电力、冶金、石化等行业以电子计算机为主的自动化控制系统、计算机集散控制系统、自动化控制系统作控制线以及检测用仪器仪表用计算机电缆。
使用特性：电压300/500v，最高工作温度聚氯乙烯绝缘不超过70℃交联聚乙烯绝缘90℃低烟无卤阻燃70°。
该电缆主要用于交流或直流300V以下的工作系统，在500V及以下时仍能正常工作。
MHYV煤矿用聚乙烯绝缘聚氯乙烯护套通信电缆用于矿场作普通信号传输，适用于固定敷设。
MHYAV煤矿用聚乙烯绝缘铝-聚乙烯粘结护层聚氯乙烯护套通信电缆用于较潮湿的斜井和斜巷。
注：ZR-阻燃G-隔氧层NH-耐火三、生产范围型号芯数标称截面（mm2)型号芯数标称截面（mm2)额定电压（KV）额定电压（KV）0.6/10.6/16/6(6/10)8.7/10(8.7/15)26/35(26/45)CUALCUALCUA。
4、绝缘：聚氯乙烯（PVC）、阻燃聚氯乙烯（ZR-PVC）、聚乙烯（PE）、阻燃聚乙烯（ZR-PE）、低烟无卤阻燃（WDZ）。
可以采用任何一种方式敷设，更适用于岩石地区的直埋敷设。
计算机信号电缆-DJYVP；DJYPV；DJYPVP；DJYJVRP；DJYPVP22。
三极管是信号放大元件和电子开关元件。
它还有一些特殊的用法，能够做成一些可独立使用的两端或三端器件，代替其它类型元件使用。
扩流把一只小功率可控硅和一只大功率三极管组合，就可得到一只大功率可控硅，其最大输出电流由大功率三极管的特性决定，见。
为电容容量扩大电路。
利用三极管的电流放大作用，将电容容量扩大若干倍。
这种等效电容和一般电容器一样，可浮置工作，适用于在长延时电路中作定时电容。
稳压二极管构成的稳压电路虽具有简单、元件少、制作经济方便的优点，但由于稳压二极管稳定电流一般只有数十毫安，决定了它只能用在负载电流不太大的场合。
SYVPVP-75-5视频同轴双屏蔽电缆额定温度：-60℃～+200℃（最高使用环境温度：200℃；最低使用环境温度：～50℃）执行标准：GB/T17737.2-2000导体：单根或多股镀银铜丝或裸铜丝屏蔽：铜丝或裸铜丝颜色：红、黄、蓝、白、黑、绿、棕、橙、透明等。
电气性能:充气电缆主要电气性能：1.充气电缆直流电阻:20℃,0.4≤1480.5≤95.00.6≤65.80.8≤36.62.充气电缆绝缘电气强度：导体之间1min1kv不击穿导体与屏蔽1min3kv不击穿3.充气电缆绝缘电阻：每根芯线与其余线芯接地，HYA电缆大于10000MΩ.km4.充气电。
2）电缆的长期允许工作温度：RV-105型应不超过105℃；其他型号应不超过70℃4、电缆型号、名称和使用范围:RV铜芯聚氯乙烯绝缘连接软电缆（电线）连接用RVB铜芯聚氯乙烯绝缘平型连接软电缆（电线）连接用RVS铜芯聚氯乙烯绝缘绞型连接软电线连接用RVV铜芯聚氯乙烯绝缘聚氯乙烯护套圆型连。
The technical standard of railway signal cable product is as follows: horizontal TB/ t2476-1993 railway signal cable
IEC/BS4066-1阻燃等级（单根电线或电缆垂直燃烧测试FlameTestOnSingleVerticalInsulatedWires/Cables）这是单根电缆的阻燃标准。
阻燃电缆◎IEC/BS4066-3阻燃等级（成束电线或电缆垂直燃烧测试FlameTestOnBunchedWires/Cables）这是成束电缆的标准。
Integrated stranded railway signal cable implementation standard GB/ t2476-1993. Railway signal cables are suitable for transmission of railway control signals, audio signals or fixed cables for fixed installation in rated voltage ac 500V or dc 1000V or below. Product name, model, specification and scope: plastic insulation and PVC sheathed railway signal cable PTYAH; PTYA; PZYA; PTYV; PTYY,; PTY22; PTY23; (PZY02; PZY03; PZY23 PZY22) 1/0.8mm (1/1.0mm) 2-48 core is suitable for railway signal communication, fire alarm signal, telegraph and other automatic device systems with rated voltage ac 500V or dc 1000V or below. Polyethylene polythene insulation composite sheath steel tape armoured PVC sheathed railway signal cable PTYA23 PTYA22 PTY23 PTY22 PTYAH23 PZYA23 PZYA22 PZY23 PZY22 0.8 mm (1/1.0 mm) 4-61 core is fit for ac rated voltage 500 v or dc voltage 1000 v and below audio signal transmission and fixed installation of railway signal and group control automation assembly line, is of general automatic transmission railway signal, can also transmit frequency shift automatic block and business phone and other audio signal. 4, using features: cable in - 40 ℃ to + 50 ℃ environment use. Cable conductor long-term working temperature shall not exceed 70 ℃. Ordinary sheath of the cable laying under the environment temperature is not lower than 5 ℃, resistance to sheath for - 10 ℃. The bending radius shall not be less than 15 times of the outer diameter of the cable (when laying) and shall be applicable to any horizontal disturbance
使用电阻，必须得知道如何认识电阻的大小。
每个电阻上都有色环，即根据色环法，来读取电阻的大小。
所谓的色环法就是用不同颜色的色标来表示电阻参数。
色环电阻有4个色环的，也有5个色环的，各个色环代表的意义如下表：根据电阻上的色环位置的不同，其代表的意义也不一样。
以五色环为例介绍每条色环的意义，如下图所示：在设计电路中使用的是常见的5色环电阻，颜色分别是棕、黑、黑、棕、棕。
第3条代表数值，分别代表的数值是0、0；第4条表示倍数，棕色为1倍；第5条代表误差，棕色表示误差范围为+1%。
Inner conductor line diameter (mm) of HYA (pipeline/overhead) : 0.40, 0.50, 0.60, 0.70, 0.80, 0.90 logarithms (yes) : 5-3000
产品名称型号规格及范围：塑料绝缘和聚氯乙烯护套铁路信号电缆信号电缆PTYA23PTYAH,;PTYA;PZYA;PTYV;PTYY,;PTY22;PTY23;（PZY02;PZY03;PZY23PZY22）1/0.8mm（1/1.0mm）2-48芯适用于额定电压交流500V或直流1000V及以下的铁。