IMHO, "high voltage" really means "high voltage gradient", itself
dependent on the conductor spacing v. the size of the measling "spots".
If the spots are larger than the widths (bridging the gaps), then 0.1 V
is too high :-( If the widths are considerably wider than the spots,
then I would consider 100 V/mm as very high, 75 V/mm as high, 50 V/mm as
moderate and <10 V/mm as low. :-) Of course, this is personal opinion
and not a standard.

Brian

Wanchai Charoendee wrote:

> According to IPC-A-600A rev. F "Measling is acceptable for class 1,2,3
> except high voltage application".  May I learn the definition of 'high
> voltage  ?  Thank.Rgds,

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