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Originally Posted by Lorenfb
A. ...........................
What is all this nonsequitur stuff?????????
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Sorry. This is -your- "nonsequitur stuff". You are mixing original post with my answers.
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A. The purpose of using the Schmitt trigger is to make the input NOT
sensitive to the slope of the input waveform.
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I agree, but this is not the point. The point is the instability in the triggering time if some noise added when the slope is too slow
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B. The triggering level is NOT set for zero crossing or it WOULD BE sensitive to
noise. The level is set to about 100mv.
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When the pick-up coil is connected there is no more noise by fixing the triggering level at 0 V rather than at 0.1 V
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C. A sine wave is MORE than appropriate as a trigger source for testing which
ALLOWS the tester to determine the input sensitivity.
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For this simple test I would agree, but the instability in the triggering time caused by the 3kHz noise on a simple sine wave signal is very disturbing for the observation of subsequent signals with an oscilloscope.
Anymore non appropriate criticisms????????