A waveform recorder employing sampling techniques

The instrument provides a permanent record on a pen recorder of oscilloscope traces of recurrent waveforms. The X sweep voltage from the oscilloscope is used in the recorder to determine once per sweep the time at which a 0.5 ¿sec pulse is to be generated. The recorder is ¿gated¿ by the pulse to produce a sample of the amplitude of the waveform, which is peak rectified, and applied to the recorder.