The Agilent 81101A 50 MHz single-channel pulse generator is the low-end of the 81100 family. All timing parameters (repetition rate,delay, width and transitions) are variable. The instrument includes an additional PLL oscillator which allows the repetition rate to be set with 0.01% accuracy. Double-pulses and pulse bursts are available. These and single pulses can be triggered externally when the PLL is off. Bursts can also be triggered by the internal PLL when not in use as the repetition-rate generator. There is also an external width (pulse recovery) mode. The selectable 50 / 1000 ohm source resistance allows output amplitudes up to 10 or 20 Vpp respectively into a 50-ohm load.