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4. Make the measurement. Turn on the motor or generator.
Cradling the tachometer in your right hand, move it as
close to the shaft as possible, but no closer than 2 inches
away. Position the instrument so its main axis is aligned
with the end of the shaft. Using your right thumb, press the
Measure button (callout 1-4) while shining the red laser
beam on the reflective tape. Confirm that the tachometer
is receiving a signal by checking that the (( )) Monitor Indi-
cator icon flashes on the display each time the beam hits
the moving tape. When the display reading stabilizes,
release the Measure button.
TWO MEASUREMENT TIPS
1. If your motor/generator's shaft spins slowly (i.e.,
at less than 50 rpm), getting an accurate reading
may require placing one or more additional squares
of reflective tape on the target. Begin by adding a
second square of tape on the circumference of the
target 180º from the first square (at 6 o'clock rela-
tive to 12 o'clock). Then perform Step 4 above, but
divide the display reading by two to account for the
presence of the second square. If the result is still
unsatisfactory, add another two pieces of tape at
3 o'clock and 9 o'clock and perform Step 4, but now
divide the display reading by four.
2. If bright ambient light is preventing the
LT2234C from receiving the reflected beam, try
shading the target.
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