Use DS345 as pulse generator
This application note discusses the procedure for using DS345 as pulse generator. Start with a square wave as the main waveform, selecting the square wave frequency (1 MHz max.) so that half of a period is the width of the pulse you want. Then choose burst modulation, with a burst count of one, and turn on the Burst/Sweep function. Use the phase control to adjust the phase of the square wave within the burst so that only a positive going (or negative going) half cycle is visible (generally a phase shift of 180 degrees for a positive pulse).
Note that by varying the phase you can also delay a pulse by up to one half a period of the frequency, with respect to an external trigger. Finally, use the offset control to adjust the baseline of the pulse to be 0 V. You will have to start with a square wave amplitude of at most one half of the maximum DS345 peak-to-peak amplitude. This gives a maximum pulse amplitude of 10 V into high impedance loads, or 5 V into 50Ω loads.
View the PDF document for more information.