INTRODUCTION! The TEKTRONIX 2230 Oscilloscope! is a combination nonstorage and digital storage dual-channel 100 MHz bandwidth instrument. It is a rugged, lightweight oscilloscope featuring microprocessor operation and alphanumeric crt readout of many of the front-panel controls. In the digital storage mode, up to three waveform sets (CH 1 and/or CH 2) may be stored in a SAVE REF memory and recalled for display at a later time. The vertical system provides calibrated deflection factors from 2 mV per division to 5 V per division. The horizontal system provides calibrated sweep speeds from 50 ns per division to 0.5 s per division for nonstorage mode with three slower sweep speeds (1 s, 2 s, and 5 s per division) added for store mode operation. A X10 magnifier extends the maximum sweep speed to 5 ns per division. The digital storage sampling rate is 20 megasamples per second maximum, and the acquired record length is 4K samples (1K may also be selected) for a single channel or 2K samples for dual-channel (CHOP or ALT) displays. Any contiguous 1K sample of an acquired record is displayable. The fast sampling rate can capture a glitch with a pulse width of at least 100 ns. A 4K compress feature enables a 4K record length acquisition to be compressed to 1K in length for ease in viewing or storing in the SAVE REF memory. If compression is not desired, all 4K or any 1K portion of a 4K record may be stored in the SAVE REF memory. The SAVE store mode stops the waveform acquisition in progress, allowing a particular display to be stored or examined before further acquisitions cause a waveform update. Cursors may be used to obtain voltage measurements, time difference measurements, and delay-time measurements on any of the store mode waveform displays. Delta volts, delay time, delta time, and 1/delta time (either delta time or 1/delta time is selectable via the MENU) are displayed in the crt readout for ease in obtaining precise measurement results. The cursors are positioned to any displayed store mode waveform to make measurements. An alternate use of the cursor-positioning control is to horizontally position the 1K display window to any location within a 4K record length waveform acquisition. The displayed portion of a 4K acquisition is stored when the SAVE REF feature is used.