Thanks Klaus.
Thats a good sample rate, 1 sample every 100usec...so you shouldnt miss transients.
I must admit, i work for a company that has shipped 1000's of outdoor mains connected items with very limited mains transient protection, and yet the failure rate is under 1% after 2 years.
We are beginning to wonder if all the alarm about mains transients is really for real.
We do have a TMOV, but that voltage goes up to 900V as it clamps, so our 450V vdd pin of our offline controller would not be protected adequately by the TMOV, but they have survived in great numbers. We dont even have a mains filter.