Tektronix TDS620A Oscilloscope- 500 MHz bandwidth (TDS 620A/644A); 1 GHz (TDS 684A) Sample rates to 2 GS/s on four channels (TDS 620A/644A); 5 GS/s (TDS 684A) 2 and 4 input channels (TDS 620A/644A); 4 input channels (TDS 684A) Pulse width, 2 ns (TDS 684A) glitch; 1 ns (TDS 620A/644A), runt, pattern and state triggering 1 mV/div -10 V/div sensitivity Infinite and variable persistence Color Grading Record lengths to 15,000 points 8-bit vertical resolution High resolution color monitor 3.5 inch DOS floppy disk drive Vertical accuracy to 1.5% Tek TriStarTM (DSP) processor Slew Rate and Setup & Hold Violation triggers Waveform pass/fail testing Advanced signal processing functions (TDS 684A) 25 automatic measurements Full GPIB programmability Desktop publishing outputs 1.5 GHz, 1 pF, 1 Megohm probe option Segmentable acquisition memory (TDS 620A/644A) VGA output