Tektronix TDS 310, TDS 320, and TDS 350 two channel oscilloscopes are digital signal processors and are superb tools for displaying and measuring waveforms. Their performance addresses the needs of both benchtop lab and portable applications with the following features. Two input channels, each with a record length of 1,000 samples and 8-bit vertical resolution. Both channels acquire waveforms simultaneously. 1 Gigasample/second maximum sample rate (TDS 350); 500 Megasamples/second maximum sample rate (TDS 320); 200 Megasamples/second maximum sample rate (TDS 310). 200 MHz analog bandwidth and fastest time base setting of 2.5 ns/div (TDS 350); 100 MHz analog bandwidth and fastest time base setting of 5 ns/div (TDS 320); 50 MHz analog bandwidth and fastest time base setting of 10 ns/div (TDS 310). A full complement of advanced functions including on-screen readout, AUTOSET, cursors, and continuously-updated automatic measurements. Waveform averaging, waveform enveloping, and hardware peak detection. A unique graphical user interface (GUI) and a logical front-panel layout which combine to deliver the standard in usability pioneered by the TDS family of oscilloscopes.