噪音指数 meaning in English

isopsophic index
noise figure

Optical amplifiers - part 3 - 2 : test methods for noise figure parameters - electrical spectrum analyser method
光学放大器.第3 - 2部分:噪音指数参数的试验方法.电频谱分析仪法
Optical fibre amplifiers - basic specification - test methods for noise figure parameters - electrical spectrum analyzer method
光纤放大器.基础规范.噪音指数参数的试验方法.电频谱分析仪法
Optical amplifiers - test methods - part 3 - 1 : noise figure parameters - optical spectrum analyzer method iec 61290 - 3 - 1 : 2003 ; german version en 61290 - 3 - 1 : 2003
光学放大器.试验方法.第3 - 1部分:噪音指数参数.光谱分