461995-EU-EN v1.5 07/13
4
Meter Operation
Reversible LCD Display
The 461995 LCD display indicates Photo Tachometer measurements in one direction and Contact
measurements in the opposite direction. This permits the user to easily read the measurement digits
in both measurement modes with the meter held in either direction.
Photo Tachometer Measurements (refer to diagram below)
1. Apply an appropriately sized square piece of reflective tape to the surface of the object under
test.
2. Move the Function switch to the PHOTO position.
3. Point the laser pointer end of the meter toward the device under test at a distance of 2" to 79"
(50 to 2000mm).
4. Press the Measure button (located on the right side of the meter) and align the laser pointer
beam with the reflective tape.
5. Verify that the Monitor Indicator appears on the upper left hand section of the LCD when the
object under test passes through the light beam.
6. Release the Measure button when the RPM reading stabilizes on the LCD.
7. If the rpm is under 50
,
apply additional squares of reflective tape. Divide the reading shown on
the display by the number of pieces of reflective tape squares to calculate the actual rpm.
NOTE:
Bright ambient light may interfere with the reflected light beam. Shading the target area may
be necessary in some cases.
CAUTION:
Rotating objects can be dangerous. Use extreme care.
Photo Tachometer
Rotating object
Reflective tape
Light source
and reflection
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