This application note introduces the Jitter analysis capabilities of the R&S RTO Digital Oscilloscope and the Jitter option R&S RTO-K12 for digital signals. It provides background information on jitter sources and standard jitter measurement tools. Furthermore it demonstrates Period jitter, Cycle jitter and Time Interval Error jitter measurements based on an application example. The benefits of different representations of the measurement results with histogram, track and spectrum display are discussed.