Has anyone used a stroboscope to measure the speed of rotation of a shaft?
It seems to me that it will strobe at various frequencies.
For example, say a shaft is rotating at 1000 RPM.
As far as I can see it will strobe at light flashing rates equivalent to 250 RPM, 500 RPM, 1000 RPM, 2000 RPM, etc.
So, if you don't know the shaft speed (as you normally won't), how would you know which one is the correct speed?
It seems to me that it will strobe at various frequencies.
For example, say a shaft is rotating at 1000 RPM.
As far as I can see it will strobe at light flashing rates equivalent to 250 RPM, 500 RPM, 1000 RPM, 2000 RPM, etc.
So, if you don't know the shaft speed (as you normally won't), how would you know which one is the correct speed?