电话计费器的介入衰耗和频率响应的测试方法天津市长途电信局张明生为了计费的方便，在电话机的用户环路上引入了大量的电话计费器，但计费器的使用却增加了用户环路的电衰耗。那么怎样才能了解介入衰耗及频率响应的变化，以及对通信产生的影响呢？要直接测试是比较困难的... Test method of telephone meter’s interventional attenuation and frequency response Tianjin Long-distance Bureau of Telecommunications Zhang Mingsheng introduced a large number of telephone meters on the telephone subscriber’s loop in order to facilitate billing, but the use of meters increased The user loop of the electrical loss. So how can we understand the changes of interventional attenuation and frequency response, and the impact on communication? To test directly is more difficult ...