3.3 Common Features for Both Internal and External Modes
The Alt Function button toggles the Alt Function chevron. When the
Alt Function chevron is on, the buttons will perform their secondary
function listed in the white section of each button. It also changes how
the tuning knob works.
Below are all the Alternate functions of each button:
The Battery button (Battery powered model only) will display the current
battery charge level from 0 to 100% for about 2 seconds. When the
strobe is not flashing, this number represents the percentage of usable
charge left in the batteries. When the strobe is flashing, this number will
be lower. It will decrease with increasing flash rates. This will give the
user, an indication of how much quicker the batteries will be discharged
at a given flash rate.
The FPM/FPS button toggles the display between Flashes Per
Minute(FPM) and Flashes Per Second (FPS). The FPM and FPS
chevrons on the display indicate which way the flash rate is being
Note that the unit automatically converts between FPM and FPS so
you can set the rate in FPM then view it in FPS by simply pressing the
The Tach button toggles the Tach chevron on the display. When the
chevron is on, the strobe is inhibited from flashing. In the external mode,
the strobe can be used as a tachometer without having the strobe flash.
In the internal mode, the strobe can be used as a frequency generator
(outputting TTL pulses) without having the strobe flash.
The Store button stores the current flash rate into the last preset location
the user has viewed.
The View button displays the next flash rate preset (one of six). It does not
change the flash rate. This allows the user to select which preset to write
over before storing the current flash rate by pressing the Store button.
When the Alt Function chevron is turned on, the current flash rate is
used as an adder. Now as long as the Alt Function chevron remains on,
the knob will add (counter clockwise) or subtract (clockwise) that initial
flash rate for each “click” the knob is turned. This in effect allows the
user to multiply the initial flash rate by 2, 3, 4, 5, etc up to the maximum
flash rate. This is very helpful on fan blades. Using this feature, one
can superimpose the blades on top of each other and check for blade
tracking, bent blades, lead and lag tests, etc.
For example: A 3 bladed fan is spinning at 3600 RPM. The strobe is
flashing at 3600 FPM. Press the Alt button to turn on the Alt chevron.
Now turn the knob clockwise 2 clicks. The strobe is now flashing at
10,800 FPM (effectively 3600 times 3) The fans blades are all
superimposed on each other. One can now see if the blades are out of
alignment, bent, etc by viewing the blades from the front or viewing
from the edge of the blades.
3.4 Charger Mode (Battery Powered Model Only)
When the charger plug is inserted into the charger jack, the strobe will
go into the charger mode. Make sure the trigger switch is not depressed.
The strobe will not do anything else when charging. (e.g. it will not flash
and the buttons have no function)
When the charger plug is inserted the strobe will display the current
battery charge percent and fast charge the batteries for up to 3 hours or
until the batteries are mostly charged. It will then turn on all the chevrons
to indicate it is now trickle charging the batteries. It should be allowed to
trickle charge the batteries for a total of 14 hours for peak performance.
3.5 Power Up Features
First press and hold the one of the buttons listed below, then turn on the
strobe using the trigger switch:
The Store button will restore the factory programmed presets. These
are: 100, 500, 1000, 3600, 7200 and 14000 FPM
The Alt Function button will turn on all the display segments for two
seconds. It will then show the software revision, “REV x.x”.
4.0 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
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 only, to be used as a reference
point. Look only at the reference point.