Both 20 MHz function generators are precision sources of sine, square and triangle waveforms, and positive and negative pulses. The frequency range is variable from 0.0001 Hz (2.78 hour period) to 20 MHz, and the frequency can be modulated, swept or decontrolled over a 1000:1 range by an external voltage. Output can be continuous or the generator can be triggered or gated by an external control signal or front panel switch.