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OPERATION
Non-Contact Measurements
Measuring revolutions per minute or total revolutions.
1. Attach a piece of reflective tape on the object to be
measured.
NOTE: Accurate measurement may not be acheived if
the rotating object to be measured is shiny. Cover with
black tape or paint then attach the reflective tape.
2. Press the POWER button to turn the tachometer on.
3. Select RPM (revolutions per minute) or REV (total
number of revolutions) by pressing the UNIT button.
4. Aim the laser beam at the reflective tape.
5. Press and hold down the POWER button to start mea-
suring.
6. Press and hold the POWER button to take another
measurement.
Laser - Do not look into the beam. Use protective
eyeglasses that are rated for 670usec for adequate
eye protection.
Contact Measurements
Measuring rotation speed using the cone or funnel-shaped
contact probe.
1. Attach the contact adapter to the tachometer. Do not
over tighten.
2. Attach the cone or funnel adapter to the tachometer
by placing on the adapter shaft. Align the shaft pin
with the notch of the adapter stem.
3. Press the POWER button to turn the tachometer on.
4. Select RPM (revolutions per minute) or REV (total
number of revolutions) by pressing the UNIT button.
5. Press and hold the POWER button to start measur-
ing.
6. Bring the contact probe into contact with the object
to be measured by touching the contact probe slowly
to the center of the rotating object. If the measuring
range of the tachometer is exceeded, “OVR” will ap-
pear on the tachometer’s display.
7. Press and hold the POWER button to take another
measurement.
8. Press the UNIT button to convert between ranges.
When a high-speed rotating object is measured
for hours using a cone or funnel adapter the
surface of the adapter may become very hot.
Measuring surface speed and distance using the 6"
circumference wheel.
1. Attach the contact adapter to the tachometer. Do not
over tighten.
2. Attach the 6" circumference wheel to the tachometer
by placing the wheel on the adapter shaft. Align the
shaft pin with the notch of the wheel stem.
3. Press the POWER button to turn the tachometer on.
4. Select meters/minute (m/M), yards/minute (Y/M),
inches/minute (I/M), feet/minute (F/M), meters (m),
yards (YRd), feet (FT), or inch (IN) depending on which
units you wish to measure.
5. Bring the 6" circumference wheel into contact with the
object to be measured by slowly touching the wheel
to the moving object.
6. Press and hold the POWER button to start measur-
ing.
7. Press the UNIT button to convert between ranges.
When making surface speed or distance
measurements, ensure that the 6" circumference
wheel’s perimeter is parallel to the object to be
measured.
Note: When using the master wheel, accuracy can be af-
fected as much as 0.3% of reading.
Memory Function
The tachometer’s memory capabilities are as follows:
1. Minimum, maximum and last measurements are re-
corded automatically by the tachometer.
2. Ten selectable measurements can be programmed into
memory by pressing the MEM button while the POWER
button is fully depressed (M1, M2, M3, … M10).
3. The average value of sequentially stored memory, up
to ten, can be viewed by pressing the MEM button.
Note: if the memory button (MEM) is not selected while
the POWER button is pressed the measurement will not
be recorded into its memory location, The memory will be
recorded automatically into memory if the measurement
made is the maximum, minimum or last measurement.
To delete stored memories do one of the following:
1. Press the MEM button for five seconds or more. All
memory will be erased after [CCCCC] is displayed.
2. Changing the units of measurements and then making
additional measurements.
3. Memory will be automatically erased if the tachometer
turns off automatically after five minutes.
Battery Replacement
When “LO BAT” flashes on the display, install new
batteries.
To replace the batteries:
1. Slide open the battery cover (located on the rear of
the tachometer).
2. Remove old batteries and insert three fresh AA size
batteries, observing proper polarity. Do not mix old
and new batteries.
3. Slide the battery cover back into place.