The MP1800A Signal Quality Analyzer Series is made up of expandable plug-in modular BERTs with built-in Pulse Pattern Generators (PPGs) supporting output of high-quality, high-amplitude signals. The analyzers also includes an Error Detector (ED) with high input sensitivity supporting signal analysis for Bathtub Jitter and Eye Diagram Measurements, and a jitter modulation source for generating various jitters, such as SJ/RJ/BUJ/SSC, and supporting Jitter Tolerance tests.