This unique instrument consists of a digital storage oscilloscope with a real-time analog oscilloscope built-in. The 3394B Digital Storage Oscilloscope has 4 channels with bandwidths of 200 MHz. Sample rate for repetitive signals is 25 GS/s. Has built-in acquisition record storage of 32K. RS-232 Interface is standard in this unit. Standard features include screen read-out, cursors, and a fully triggered delayed timebase. The scope can be switched to the familiar analog mode giving all the advantages of a real time signal display, from the digital mode and back, at the push of a button. The digital mode offers AUTORANGING capabilities for all channels as well as for the timebase. The 3394B has all standard DSO benefits.