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Caution: The Phillips head screws securing both the housing
and the battery compartment cover are not equipped with
retainers, so they are easy to lose. The PCT2236B includes
three spare screws designed to serve both purposes.
To measure the rotational speed of a motor/generator shaft:
1. Identify the target. Determine whether there is a larger
surface to measure than the shaft itself. If some thing with a
larger diameter (for example, a fan or a wheel of any type)
is attached to the shaft, use any flat part of its surface as
the measurement target instead.
2. Prepare the target. Either unplug the generator/motor or
make sure that it cannot be turned on remotely or turn on
automatically. Scrape the target area clean enough so a
piece of tape will stick to it. If the target area is naturally
reflective, cover it with black tape or paint.
3. Attach reflective tape to the target. Cut a 1/2 in. square
piece of reflective tape, remove its backing, and apply it to
the target area.
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 Indicator icon flashes
on the display each time the beam hits the moving tape.
When the display reading stabilizes, release the Measure
button.
14
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