滤光计 meaning in Chinese

filter device

Optical fibre amplifiers - basic specification - test methods for out - of - band insertion losses - filtered optical power meter
光纤放大器.基本规范.谱带外插入损失测试方法.滤光计
Optical fibre amplifiers - basic specification - part 7 - 1 : test methods for out - of - band insertion losses - filtered optical power meter
光纤放大器.基本规范.第7 - 1部分:谱带外插入损失的试验方法.滤光计