>Good point. My 20MHz crystals I run my pics on are
>alledgedly +- 50ppm. That should probably do the trick.

Think in terms of "a lot more accurate than you set the scope to" :))

The reality is that the calibration on screen is not very accurate at all,
even on the best scopes, unless you have a dso where the sample rate is
controlled accurately. But even then your ability to read the display is
much lower than the calibration accuracy.

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