Stopped Image:
Example
True
Rotational Speed
of Target Object
(rpm)
Flash Rate of
Stroboscope
(fpm)
Multiple
of True
Rotational
Speed
Number of
Stopped
Images
900 rpm
3600
2700
1800
900
450
300
4 times
3 times
2 times
1 time
1/2 times
1/3 times
4
3
2
1
1
1
Multiple/Divide by 2 Function - The flash rate can be doubled or
halved by x2 and 1/2 keys on the operation panel.
1. Doubling the flash rate(x2) Press x2 key to multiply the cur-
rent flash rate by a factor 2.
Note:
The use of the x2 key will have no effect when multipli-
cation of the current flash would result in a value that exceeds
the maximum flash rate range. After the flash rate changes, it
becomes the new value based on the set display resolution.
Therefore, the rate may likely not return to the original frequen-
cy, even if the “1/2” key is pressed.
2. Having the flash rate(1/2) Press “1/2” key to divide the cur-
rent flash rate by a factor of 2. Operation Indication
Note: The use of the 1/2 key will have no effect when the divi-
sion of the current flash rate would result in a value that goes
below the minimum flash rate.
After the flash rate changes, it becomes the value based on the
set display resolution. Therefore, the rate may likely not return
to the original, even after pressing the x2 key.
Phase Shift (Angle) - First, press ‘SET” key, then enter this
mode. When the rotation speed of the target object and the
flash rate of the ST-320BL becomes equal, the phase shift
function can be used to delay the flash so that the image will
appear to rotate incrementally. The phase shift angle can be
increased or decreased 3°, each time the “+” or “-” keys are
pressed or the adjustment dial is turned CW or CCW. The sub
display will show the cumulative angle of the phase shift.
Flash Duration (Brightness) Settings
The flash duration, RATIO key, can be set within the range of 0.1°-
2.5° over a 360° period with a resolution of 0.1°.
When the flash duration is lengthened, the brightness of the flash
will be increased, however the image of the target object may
appear slightly out of focus. When the flash duration is shortened,
the brightness will be decreased, yet the image of the target ob-
ject will become more focused.
To change the flash duration in either Internal or External modes,
first press the “RATIO” key. Once pressed, “Flash Time” will ap-
pear with the current flash pulse duration ratio in the sub display.
The flash pulse duration can now be modified.
To set the flash pulse duration while in the modifiable mode;
press “+” key, or turn the dial in the clockwise direction to in-
crease the flash pulse duration by 0.1° increments.
Press “-” key, or turn the dial in the counter clockwise direction to
decrease the flash pulse duration by 0.1° increments.
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