>> Less than 1 percent would be worst case. If 1ppm could be
>> achieved that would be great but I don't know if that is possible.
>> I'm not going to use it for calibration work.
>=20
> But what is your crystal accuracy?

The meaningfulness of the result rather depends on what signal
frequency is being measured. For example, if it's only a few kHz
then the portion of a wave left off the count when the 1s is up
could be more significant than the ppm error of the PIC crystal

Joe

Nice to see some PIC on the list
--=20
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