Hi David,
It's not an elongated dot. It's simply a small segment of the sine waveform. If you scroll through the scan positions, you will see that "dot" follows the shape of the sine wave.
Therefore maybe jitter is a nasty term (it does not degrade the REP scan). Specific causes are repetition period jitter (hum) in your signal generator, and jitter in the delay times produced by the Rate meter. Both are "corrected" to show the dot at the proper horizontal position, i.e. the dot position is determined according to the recorded time difference between strobe and (nearby) trigger event.
Albert
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.... and I've now got a fairly stable trace but the dot is elongated to about 0.4 vertical divisions at the zero crossing points when in manual scan mode, is this normal or do I still have an excessive amount of trigger jitter?
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David Partridge
