。
HYA通信电缆用途：主要用于传输音频、150kHZ及以下的模拟信号和2048kbit/s及以下的数字信号。
在一定条件下，也可用于传输2048kbit/s以上的数字信号。
适用于市内、近郊及局部地区架空或管道敷设线路中，也可直埋。
RS485 bus due to its wiring is simple, stable and reliable and widely used in video surveillance, access control intercom, building alarm and other fields, however, because there are a lot of in the process of 485 bus wiring is not completely accurate concept leads to many problems. Some wrong ideas will now be clarified.
The cross section of the control cable is generally no more than 10 square meters, and the power cable is mainly used to transport power, which is generally large. Due to the above all when it comes to the reason, the specifications of the power cable can generally larger, to 500 square feet (normal manufacturer can produce range), again big cross section of the general factory is relatively less, you can do and control cable section generally small, generally not more than 10 square, tell from some cable, power cable according to the demand of power grid more generally for 5 core, and control cable transmission control, some more, according to the terms of more than 61 core, but also can produce according to user re
第五的25对是用“白灰”标识线缠着的。
第六的25对是用“红兰”标识线缠着的。
第七的25对是用“红桔”标识线缠着的。
第八的25对是用“红绿”标识线缠着的。
主要电气性能：1.直流电阻:20℃,0.5mm铜线,小于等于95Ω/km。
The cross section of the control cable is generally no more than 10 square meters, and the power cable is mainly used to transport power, which is generally large. Due to the above all when it comes to the reason, the specifications of the power cable can generally larger, to 500 square feet (normal manufacturer can produce range), again big cross section of the general factory is relatively less, you can do and control cable section generally small, generally not more than 10 largest square, tell from some cable, power cable according to the request of power grid, most commonly for five core, and control cable transmission control signal, some more, according to the standard terms of more than 61 core, but also can produce according to user re
万用表又称为复用表、多用表、繁用表等，是电力等部门不可缺少的测量仪表，一般以测量电压、电流和电阻为主要目的。
万用表按显示方式分为指针万用表和数字万用表。
是一种多功能、多量程的测量仪表，一般万用表可测量直流电流、直流电压、交流电流、交流电压、电阻和音频电平等。
使用万用表进行电阻的测量，简单而便捷。
使用前的准备1）上好电池(注意电池正负极)2）插好表笔。
“－”黑；“＋”红3）机械调零：万用表在测量前，应注意水平放置时，表头指针是否处于交直流挡标尺的零刻度线上，否则读数会有较大的误差。
450/750 v polyvinyl chloride insulated control cable, applicable to dc and ac 50 hz, rated voltage 450/750 v power plants, power plants, factories, mines, ports and petrochemical enterprises such as long-distance control loop, as a connecting line between electrical instrumentation and automation instrumentation, phoresy all kinds of electric energy role, make the whole electric, reliable operation.
煤矿用控制电缆允许的弯曲半径：对有铠装或铜带屏蔽结构的电缆应不小于电缆外径的12倍。
对有屏蔽层结构的软电缆，应不小于电缆外径的6倍。
对无铠装层的电缆应不小于电缆外径的6倍。
产品在全国几十个煤业集团及矿山上使用，获得了较高的评价和赞誉。
DJYP2VP2－22 聚乙烯绝缘对绞铜带分屏蔽及总屏蔽聚氯乙烯护套钢带铠装计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽并承受较大机械力固定场合。
DJYP3V22 聚乙烯绝缘对绞铝塑复合带分屏蔽聚氯乙烯护套钢带铠装计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽并承受较大机械外力固定场合。
每个电缆盘外侧应标明：a、制造厂名称或商标b、电缆型号及规格c、长度md、制造日期：年月e、标准编号f、毛重kg：g、表示电缆盘正确旋转方向的符号3、运输和保管a、线盘不允许平放b、运输中严禁从高处仍下装有电缆的电缆盘，严禁机械损失电缆。
Low smoke halogen free cable All the value of the halogen ≦ 50 PPM (PREN 14582) according to regulations after low produce halide body content of < 100 parts per million (according to the regulations EN5067-2-1) halide produced by the body after low PH ≧ 4.3 after soluble in water, weak acid) (EN - ) according to regulations and hid products in an airtight container through a beam of light after the light transmittance ≧ 60% (according to regulations, EN - 50268-2) low Pb < 90 PPM, +, Hg, Cd, Cr6, PBBs, PBDEs are less than 5 PPM
6、最低安装敷设温度：序号1～4-45℃序号5～140℃HYAC自承式电缆:适用于本地电信网的城市与乡镇电信线路，也适用于接入公用网的专用网线路。
。
主要用于管道敷没，在架空安装时需要用吊线支承。
以25对为基本单位,25线对的基本单位也可由12对和13对2个子单位组成，50单位的超单位由二个12对和二个13对两个子单位组成，100对的超单位由四个25基本单位组成。
响应速度快，适合频繁启停的场合。
混合式步进电机工作原理混合式步进电机的结构与反应式步进电机不同，反应式步进电机的定子与转子均为一体结构，而混合式电机的定子与转子都被分为下图所示的两段，极面上同样都分布有小齿。
定子的两段齿槽不错位，上面布置有绕组。
上所示为两相4对极电机，其中的l、7为A相绕组磁极，8为B相绕组磁极。
每相的相邻磁极绕组绕向以产生上图中x、y向视图中所示的闭合磁路。
B相与A相的情况类似。
阻燃电缆特性型号铜芯铝芯名称用途ZA-YJV/ZB-YJV/ZC-YJVZA-YJLV/ZB-YJLV/ZC-YJLV交联聚乙烯绝缘聚氯乙烯护套A(B、C)类阻燃电力电缆可敷设在对阻燃有要求的室内、隧道及管道中。
专业生产0.6/1KV火牛多股软芯电缆线专门用于电镀设备,PCB设备,自动化电镀生产线,电路板设备之上，连接火牛头及整流器上的电缆，此种电缆为双色双层绝缘，内层为白色绝缘的PVC，外被为橙色的PVC，耐高低温、耐腐蚀、耐油性，耐酸碱性极强。
Coaxial cable with hard copper wire as the core, outsourcing a layer of insulation materials. The insulating material is surrounded by tightly woven network conductors and covered with a protective material. There are two widely used coaxial cables. One is the 50 ohm cable, which is used for digital transmission. The other is the 75 ohm cable, used for analog transmission, or broadband coaxial cable. This distinction is made for historical reasons, not for technical reasons or manufacturers.
The sequence table of 200 pairs of communication cables (log-log cables) shows that there are 4 kinds of marking lines in 100 pairs of communication cables, and 25 pairs of marking lines are wrapped with the marking line of "bailan". The second 25 pairs are wrapped in "white orange" lines! The third 25 pairs are wrapped in "white and green" lines! The fourth 25 pairs are wrapped in "white brown" lines! The fifth 25 pairs are wrapped in a "white grey" logo line! The sixth 25 pairs are wrapped in a "red orchid" logo line! The seventh of the 25 pairs is wrapped in a red orange logo line! The eighth 25 pairs are wrapped in "red and green" lines! Manufacuring HYA; HYA22; HYA23; HYA53; ZRC - manufacuring HYA; ZRC - HYA53HYAT; HYAT23; HYAT53; HYAT22; HYYT; ZRC - HYAT; WDZ - HYAT; ZR - HYAT53; ;