– 6 –
5.0 O
PERATION
1. Make sure that the strobe has 3 charged batteries in the battery
compartment; and they they are aligned in the corrected polarity.
2. Aim the strobe at a moving object, then press and hold the ON/OFF
Button for approximately 3 seconds.There will be a slight delay
before the strobe begins flashing. The strobe will flash at the most
recently set frequency in flashes per minute, which appears on the
display.
NOTE
: If the Low Battery icon begins to flash (item
15
, page 4),
replace the batteries (see section 4).
3. Press the Mode Button to cycle through the different settings.
Stop when the desired setting is highlighted on the display..
Display fields Influencing the set signal.
Refer to figure on page 3.
0
1
PULS µs
Flash duration (in microseconds).
0
2
PULS deg
Flash duration (in degrees).
0
3
DELAY ms Delay time (in milliseconds) between the internal
trigger signal and the fl ash.
0
4
PHASE deg Delay time between the internal trigger signal
and the flash (in degrees,relative to the
frequency).
Units deisplayed.
Refer to figure on page 3.
0
8
FPM
Flashes per minute.
10
Hz
Frequency of motion per second.
Operating information
13
INT
Device is generating flash frequency.
14
LOBAT
Battery is running low.
NOTE:
A parameter which has been set to differ from the default setting
flashes during operation.
NOTE
: Pressing the and
buttons simultaneously resets the
strobe to its default settings.
NOTE:
Some modes only effect device functioning when external
triggering is employed.
NOTE:
Static images are not only created at a precisely corresponding
flash frequency, but also at multiples and fractions of this
frequency.
– 15 –
The harmonic images at 6,000 and 4,000 RPM are not singular, but dou-
ble and quadruple. A singular image does appear at 3,000 and again at
1,500 RPM. 1,500 is one half of 3,000. Therefore, the rate is 3,000 RPM.
Example 3: (Out of Range)
This final example shows how speeds faster than 12,000 RPM (the upper
limit of the Pocket-Strobe) can be calculated.
This is the object which is rotating. Its speed is known
only to be greater than 12,000 RPM. Because it has a
uniform shape, an orientation mark is added.
To determine its speed, three steps are required:
1. Starting from the maximum speed of the strobe, slowly reduce the
flash rate. Look for singular frozen harmonic images.
2. Find at least two images. (For greater accuracy, find three). Label
these rates as“X,” “Y’ (and possibly “Z”).
3. Plug these values into a suitable equation (see page 19) and calculate
the object’s RPM.
Step 1:
As the speed is reduced, the following images appear:
Image No.:
1
2
3
4
Flash Rate:
6,000
4,000
3,000
1,500
Image No:
1
2
3
4
Flash Rate:
9,600
7,200
4,800
3,600
Point “X”
Point “Y”
Point “Z”
M
M
