10
4.4
Tachometer Mode - External Input Required
When an external input is supplied to the unit and the strobe is put in
the Tachometer Mode, the unit will read the signal from the external
input (sensor) and display the reading on the LCD display without
flashing the lamp.
The strobe will not flash in the Tachometer
Mode.
To enter the Tachometer Mode:
1.
Press the
ALT FUNCTION
button and then the
TACH
button.
2.
The
TACH
icon will be displayed.
NOTE:
If the external input signal exceeds the maximum flash rate,
the strobe will go into the Tachometer Mode automatically.
To exit the Tachometer Mode:
1.
Press the
ALT FUNCTION
button and then the
TACH
button.
2.
The
TACH
icon will go away.
4.5
Power Up Features
When the strobe is powered up it will remember the last settings.
Press and hold the
x2/MENU
button, then turn on the strobe by
depressing the trigger switch. This will turn on all the display segments
for two seconds or until you release the button. It will then show the
software revision, “REV x.x” and then go through a display diagnostic.
Press and hold the
÷2
button, then turn on the strobe by depressing
the trigger switch. This will restore the factory programmed presets.
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.
