Video-Synchronisations-Generator (Hor Vert Pulse)

When troubleshooting complex digital equipment such as a micro-processor, satisfactory triggering of an oscilloscope can be difficult to achieve. The trigger circuit of an oscilloscope is designed to give a stable trace on the screen by initiating the timebase sweep at the same point on successive cycles of a periodic waveform, which it achieves by monitoring the amplitude and polarity of the signal.