Switches, Lossy Components, and the Need for External Reflectance Standards Posted on July 2, 2019August 5, 2021 by OptoTest Share This... This article focuses on RL measurement setups that are prone to introducing testing errors. Ways to mitigate these errors are discussed. Some errors are unavoidable; therefore, steps for correcting them out or reducing them are also described here. Click here to read the full article on Lightwave’s website.