Bob, In the box that came with your model airplane tach there would have
been instructions pointing out that flourescent lights are used for calibration.
The 60 cps pulsing of the light is perfect to calibrate the tach. As
a model airplane buff I've used them for years. They're cheap and accurate.
Regards, Glen Byrns
>I the past, I have used my optical tach to measure RPM and check tach
>accuracy. This is a unit I bought from the Radio controlled model airplane
>shop.In R/C model flying, it is held in front of the propeller and the
>light pulses cause it to read prop RPM. On my sprite, I just paint two white
>marks on a pulley and read engine speed. This is a well and good when the
>tach is in the car, but what I need is something that will check a tach on
>the bench. Anyone out there able to design a "pulse gererator" of sorts from
>Radio Shack parts I could build as a winter project? Bob C