Keithley 3390 arbitrary waveform function generator 50mhz keithley 3390 p the keithley 3390 is an arbitrary function generator and waveform frequency generator the 3390 is an easy to use signal generator with advanced function pulse and arbitrary waveform capabilities it has superior signal integrity faster rise and fall times lower noise and greater waveform memory to provide high quality output signals p p the high resolution waveforms are supported by four times the waveform m