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The Hewlett-Packard Model 1744A is a dual-channel, 100-MHz, delayed-sweep variable persistence storage Oscilloscope designed for single-shot transients and low duty cycle waveform analysis in the bench or field environment. The writing speed specification of 1800 cm/μs permits full screen capture of transients at the maximum slew rate of the vertical Amplifier system. The dual-channel dc to 100 MHz vertical deflection system has 12 calibrated deflection factors from 5 mV/div to 20 V/div. A maximum sensitivity of 1 mV/div to 30 MHz is provided an both channels by means of a 5X vertical magnification feature. Selectable input impedance of 50 ohms or 1 megohm permits selection of that impedance which best meets measurement requirements. The horizontal deflection system has calibrated sweep rates from 2 s/div to 0.05 μs/div and delayed sweep rates from 20 ms/div to 0.05 gs/div. A 10X magnifier expands all sweeps by a factor of 10 and extends the fastest sweep to 5 ns/div. In alternate or chop modes, a trigger-view control will display three signals: the channel A signal, the channel B signal, and the trigger signal. This allows you to correlate time between the trigger signal and the channel A and channel B signals. In trigger-view operation, center screen represents the trigger threshold point, allowing you to see the triggering level location. With the A VS B control, an X-Y mode of operation is possible. The channel A input (Y-axis) is plotted versus the channel B input (X-axis)