The Model 184A/B is a solid-state, lightweight laboratory and general-purpose variable persistence storage oscilloscope with plug-in capabilities. The instrument is designed to display complex high frequency waveforms and to measure alternating and direct-current voltages. The oscilloscope has a high writing speed combined with a bright, easily viewed, CRT display. It provides a bright visual display to simplify the measurement of low duty cycle signals. The variable persistence capability is especially useful for viewing slow-speed signals. The storage feature of Model 184A/B can be used to store single-shot occurrences for later viewing or photographing.