This instrument enables high speed measurement of the optical properties of LD and LED light sources, optical amps, and other devices. Thank you for purchasing the AQ6370D Optical Spectrum Analyzer. This. Test Equipment Solutions Ltd specialise in the second user sale, rental and distribution of quality test & measurement (T&M) equipment. We stock all major equipment types such as Spectrum Analyzers, Signal Generators, Oscilloscopes, Power Meters, Network Analyzers etc from all the major suppliers. The YOKOGAWA AQ6370D High-Performance Optical Spectrum Analyzer is an engineered solution for precision spectral characterization of optical components and communication systems operating across the visible to near-infrared spectrum (600–1700 nm). YOKOGAWA provides registered users with a variety of information and services.