461880 V2.2 8/09
7
Tachometer Operation
Safety
WARNING: Do not directly view or direct the laser pointer at
an eye.
Low power visible lasers do not normally present a
hazard, but may present some potential for hazard if viewed
directly for extended periods of time.
Reversible LCD Display
The meter 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.
Selecting Function and Units
Press and hold the Tachometer Function pushbutton on the right side of the 461880.
Repeated presses of the
FUNCTION/SEND
key will scroll through the available modes:
RPM – Contact RPM measurement.
M/min – Surface speed - Meters per Minute measurement.
Ft/min – Surface Speed - Feet per Minute measurement.
RPM – Non-contact RPM measurement.
NON-CONTACT PHOTO TACHOMETER MEASUREMENTS
1. Apply an appropriately sized square piece of reflective tape to the surface of the
object under test.
2. With the meter OFF, point the laser pointer end of the meter toward the device under
test.
3. Press and hold the Tachometer Function Pushbutton (located on the right side of the
meter). Press the
FUNCTION/SEND
key to select the non contact RPM mode. Align
the laser pointer beam with the reflective tape.
4. Verify that the ((
●
)) Monitor Indicator appears on the LCD when the object under test
passes through the light beam.
5. If the measurement is under 50 RPM
,
apply additional squares of reflective tape.
Divide the reading shown on the display by the number of pieces of reflective tape
squares used to calculate the actual reading.
6. When the reading on the display stabilizes, note the reading.
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.
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