Reference Mark: When measuring the RPM of a rotating device, place or select a unique mark
on the device to use as a visual reference.
Correcting for Reference Mark Illusions: A flash rate of ½ or ¼ of the true RPM will yield one reference mark image. To eliminate this type of error, adjust the fine or course flash rate keys to
get two clear reference mark images 180° apart. Then press the "/2" key once and use fine
adjustments to hold the single reference mark still.
Flash Phase Adjustments: When measuring the speed of a rotating device that is partially
blocked from view so that only an arc is visible, one can shift a reference mark into view by using
the Phase Adjustment keys.
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