Re: Tektronix 7854 Digitization Issue

 

The "low frequency" that you see is actually the retrace (return of beam to left of screen).
At the beginning of your video, the retrace is quite visible as the low-frequency waveform. Subsequent acquisitions show artefacts caused by the fact that the digitisation system wasn't designed to show the retrace as a separate trace so it's just interfering.

Raymond

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