Re: Calibrating Engine RPM

[Gramin@aol.com]

In a message dated 26/09/97  06:56:59, Mark B writes:

<< this all assumes that the mains are stablised at 50Hz!
 testing here in south africa reveals that the supply can vary up to 5%>>

It does in UK too - but wave you fingers in front of the screen you are now
looking at and you will see a crystal controlled strobo  50 hz source
immediately.   Bit more expensive if you chop it up in the blades though.

Graham C. G-EMIN