if protective impedance is used, the current between the part and the supply source shall not exceeed 2mA for d.c.,its peak value shall not exceed 0.7mA for a.c. and
-for voltages having a peak value over 42.4 V up to and including 450V,the capacitance shall not exceed 0.1uF,
- for voltages having a peak value over 450V up to and including 15KV, the discharge shall not exceed 45uC.作者: ll123456 时间: 2012-1-4 18:49
一般都是计算而得。
根据 22章的要求，阻抗保护需要有两个，在一个实效的情况下同时需要满足8。1。4的要求
注意交流电的峰值是 根号2的倍数关系，正玄波的关系作者: ehfhhe 时间: 2012-1-4 18:50
但具体用什么仪器测量。因为是电流。用示波器只能测出电压。作者: ll123456 时间: 2012-1-4 18:50
计算而得，所有测试设备都有内阻，一旦你联上电流表数值就不等同了作者: ehfhhe 时间: 2012-1-4 18:50
if protective impedance is used, the current between the part and the supply source shall not exceeed 2mA for d.c.,its peak value shall not exceed 0.7mA for a.c