Quote:
Originally Posted by bandersen
Trigger is not used in XY mode.
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You are prob right, but if so, then again, he should get no horizontal activity when the input to CH1 is disconnected.
No input = dot roughly in the center of the oscilloscope
CH1 connected = line sourced from alignment device
And changing the trig source switch (int/line/ext) should have no effect on the dot's movement at all, only input on CH1, if it's working the way it should.
info on scope here.
https://w140.com/tekwiki/images/1/1c/070-3827-00.pdf page 22