[sdiy] Moogey jitter

[Ian Fritz]

I had a look at Kevin's jitter measurement, and I can tell you it is 
completely bogus.  Nobody in their right mind would ever make the 
measurement that way -- triggering off such a slow slope.  The problem is 
that any amplitude variation of the signal will cause the scope to trigger 
either early or late, and this will translate directly into variation in 
position of the reset on the scope.  With a small slope, there is obviously 
going to be a large error.   In fact, if you make a horizontal line through 
the ramp you will see that the width of the trace in the horizontal 
direction is about the same as the measured "jitter".  This guy just plain 
does not know how to use a scope.

I was also appaled that he does not seem to understand how digitization 
works.  A fool, truly.

   Ian