Jan-Erik:
> What type of environment is it used in ?
Automotive scan tool

Valise:
>  Are you so kind and tell us on how many pieces has been computed
this 3%. I'm very curious because I found a quite similar rate in
other circumstances.

A few hundred units over the last couple of years

Wouter:
>Do a check by inspecting
the shape of your XTAL-OUT pin using a scope

Well, even if I did understand what all you said, I couldn't do it because I 
don't have a scope.  I'm sure it's good information though.

>Currently I use a resonator instead of a crystal for
the prefab Wisp628's

So is a resonator more reliable than a crystal?

Can I assume in the crystal mfg's literature that "Load capacitance" 
specifies the recommended values for c1 & c2?  That would mean I'm using 
capacitors that are 83% bigger than recommended.

Thanks
-Mark

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