Tektronix TVS621A Waveform Analyzer, Digital Oscilloscope, 250 MHz, 1 GSa/s, 2 channels, VXI C-Size. Features Fully Programmable with an Extensive SCPI Command Set and Message Based Interface Fast Rearm Capability with Auto-Advance Acquisition Mode Sample Intervals as Short as 200ps/Point with Real Time Sampling Acquisition Modes Such as Auto-Advance, Envelope, and Average A Full Compliment of Internal Triggering Modes, Including Main, Delayed, Edge and Pulse Triggering Trigger Sources from Input Channels, Front Panel External Trigger, and VXI Backplane Triggers Very Fast Calculation System for Measurements, Waveform Math, and Waveform Transforms