Monarch Instrument Pocket LED Strobe - Manual (Page 9)

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and remains constant as the fl ash rate increases or decreases. The
strobe automatically calculates how wide the pulse width should
be at different fl ash rates to keep the blur constant – the faster the
fl ash rate, the narrower the pulse width. The pulse width equals:
(setting in degrees/360) x (1/fl ash rate in Hz).
Thus the blur remains constant no matter what the fl ash rate*.
1.2.2 Pulse Duration Adjustment
The second method is to adjust the fl ash pulse width to a fi xed
number of microseconds. Here the user sets the fl ash pulse width
in microseconds not degrees. As the fl ash rate increases, the pulse
width stays the same* and the image will get brighter and more
blurred as the fl ash width remains constant*. The degree of rotation
visible changes to keep the pulse width of the fl ash constant*.
*Note: There are two limits maintained by the strobe – the pulse
can never be greater than 2500 µs nor can it exceed 18° of rotation.
The strobe automatically adjusts these values as the fl ash rate is
increased or decreased to maintain these limits at all times. For
example - at a fl at rate of 600 fl ashes per minute, 14° of blur
represents a fl ash pulse width of 3800 µsec. The Strobe will limit
this value to 2500 µsec or 9° of rotation (blur).
2.0 PREPARATION FOR USE
The Stroboscope may be hand held or mounted on a tripod or other user
supplied bracket using the ¼-20 UNC bushing on the underside of the unit.
2.1 Power
The LED Strobe is battery powered and has internal rechargeable
batteries. The unit should be charged before use (see Section 5.0).
The actual operating time of the stroboscope depends on the fl ash pulse
width. Narrower fl ash widths increase the operating time.