Oscilloscopes come in many different sizes, configurations and capabilities. All oscilloscopes graph signals over time. From general purpose bench oscilloscopes to high performance oscilloscopes they vary widely in terms of the speed of signals they can capture and analyze. Today, the most common types of oscilloscope used on an engineer's bench is a digital oscilloscope. The categories of a digital oscilloscope include: Digital Storage Oscilloscope (DSO), Digital Phosphor Oscilloscope (DPO), Mixed Signal Oscilloscope (MSO), and Mixed Domain Oscilloscope (MDO).