Fun with TE today:
Compare Jitter of two OCXO. Yesterday, to compare results with DMTD,
Cycle-to-Cycle phase difference between two OCXO was plotted on scope:
![](https://i.imgur.com/ad49eCi.png)
Now that does not look right, jitter should be random not periodic
![Shocked :o](https://www.eevblog.com/forum/Smileys/default/shocked.gif)
Because this is a comparison measurement, how to be sure,
what to make of it, maybe even a sampling artifact? Today it dawned on me:
Now with third OCXO, one can do another comparison and figure out the culprit!
![](https://i.imgur.com/neS4WCS.png)
Now that looks more like expected!
Culprit is found in either OCXO or it's surrounding circuit
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
Now to dig there further
![Tweak :-/O](https://www.eevblog.com/forum/Smileys/default/smiliey_cal.gif)
Edit: Also, I want to add that this specific function - to plot a
measured value as a trace -
is what makes a "professional grade" DSO for me. You sure do not need it often,
but IF it's a godsend...