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Model 461893 Ver. 1.3 Oct. 2002
3
Meter Description
1. Photo source
2. LCD Display
3. Memory record button
4. Battery compartment on rear
5. Measure button
Meter Operation
RPM Measurements
1. Apply a small piece of reflective tape to the object under test as shown below.
2. Point the meter's photo source at the tape on the object and press the Measure button.
Hold the meter from 2 to 6" (50 to 150mm) from the reflective tape depending on
ambient light.
3. Check that the Monitor icon flashes on the LCD indicating that the meter is sensing a
reflection from the tape. If the monitor does not appear check that the light source is
hitting the reflective tape at a 90
o
angle.
4. Release the Measure button when the display stabilizes (2 seconds approx.). Note the
LCD RPM reading.
5. If the RPM value is < 50, apply additional pieces of reflective tape (four pieces are
shown below). Divide the LCD reading by the number of reflective tapes to compute
the actual RPM (Actual RPM = Reading / 4).
Photo Tachometer
Rotating object
Reflective tape
Light source
and reflection