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8
To select a flash rate from a Preset (memory) location:
1. Press the ALT FUNCTION button and then the MEMORY button.
2. READ will be displayed.
3. Turn the tuning knob to cycle through the preset flash rates.
4. Once the desired flash rate is displayed, press the MEMORY
button to select it. Press any other button to cancel.
5. DONE will be displayed.
To store the current flash rate in a Preset (memory) location:
1. Press the ALT FUNCTION button and then the MEMORY button.
2. READ will be displayed.
3. Do NOT turn the knob and press the MEMORY button again.
4. STORE will be displayed.
5. Turn the tuning knob to cycle through the memory locations.
6. Once the desired memory location is displayed, press the
MEMORY button to store the current flash rate in that location.
Press any other button to cancel.
7. DONE will be displayed.
Internal “Phase” Delay
Once the flash rate has been adjusted to give a stopped motion image,
the PHASE DELAY button may be used with the knob to increase or
decrease the phase of the reference mark location. Use the PHASE
DELAY button and knob to bring a reference mark, such as a key way,
into your line of sight.
To adjust the “Phase” Delay:
1. Press the PHASE DELAY button.
2. PHASE will be displayed on the bottom line and the current flash
rate will be displayed on the top line.
11
5.0 USING THE STROBOSCOPE TO MEASURE
RPM
The primary use for a stroboscope is to stop motion for diagnostic inspection
purposes. However the stroboscope can be used to measure speed (in
RPM / RPS). In order to do this several factors need to be considered. First,
the object being measured should be visible for all 360° of rotation (e.g. The
end of a shaft). Second, the object should have some unique part on it, like
a bolt, key way or imperfection to use as a reference point. If the object
being viewed is perfectly symmetrical, then the user needs to mark the
object with a piece of tape or paint in a single location to be used as a
reference point. Look only at the reference point.
If the speed of rotation is within the range of the stroboscope, start at the
highest flash rate and adjust the flash rate down. At some point you will
stop the motion with only a single reference point of the object in view.
Note that at a flash rate twice the actual speed of the image you will see two
images (reference points). As you approach the correct speed you may see
three, four or more images at harmonics of the actual speed. The first
SINGLE image you see is the true speed. To confirm the true speed, note
the reading and adjust the stroboscope to exactly half this reading, or just
press the ÷2 button. You should again see a single image (which may be
phase shifted with respect to the first image seen).
For example, when viewing a shaft with a single key way you will see one
stationary image of the key way at the actual speed and at 1/2,1/3,1/4, etc,
of the actual speed. You will see 2 images of the key way at 2 times the
actual speed, 3 key way at 3 times, etc. The FPM equals the shafts
Revolutions Per Minute (RPM) at the highest flash rate that gives
only one stationary image of the key way.
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