Press the MENU
bu on to enter the DELAY menu. The
current se ng will be shown and the On-Target indicator
will
be on for the currently selected value.
Use the arrows on the joys ck to select the desired Jog
method. The op ons are: NONE, PHASE, and TIME.
Press the MENU bu on
to select a Delay method. This
will enter the sub-menu for PHASE, TIME or VRPM.
5.7.1 NONE
To cancel the DELAY mode, press the MENU bu on when
NONE is displayed.
5.7.2 PHASE
To Delay by PHASE, press the MENU bu on when PHASE is
displayed.
This method of delay is set the same as PHASE in JOG. NOTE:
The adjustments happen in
real me
, so if the strobe is
fl
ashing
the user can view the e
ff
ect of changing the delay.
5.7.3 TIME
To Delay by TIME, press the MENU bu on when
TIME
is
displayed.
This method of delay is set the same as TIME in JOG. NOTE:
The adjustments happen in
real me
, so if the strobe is
fl
ashing
the user can view the e
ff
ect of changing the delay.
5.7.4 VRPM
Virtual RPM (VPRM) is an AUTO delay mode. To set VRPM,
press the MENU bu on
when VRPM is displayed.
The virtual RPM value will be shown. Use the joys ck to set the
23
desired value (refer to sec on 5.1.1). VRPM can be set from
–60.0 RPM to +60.0 RPM.
Press the MENU bu on
accept and exit. NOTE: The
adjustments happen in
real me
, so if the strobe is
fl
ashing the
user can view the e
ff
ect of changing the RPM.
To exit the DELAY Menu, press the Power bu on .
Press the Power bu on to escape back out of the setup menu.
6. STROBE
BRIGHTNESS
The strobe’s brightness depends on how wide the strobe’s flash pulse is; the
wider the pulse, the brighter the flash from the LEDs appears to be. There is
however, a downside to the wider pulses. All strobes work by giving short
bursts of light (the pulse width) at a rapid repetition rate (the flash rate).
Strobes rely on the persistence of the human eye (the ability to remember
and image) and its response to bright light to give an apparent stop motion
image. Imagine a shaft rotating at 6000 RPM or one rotation every 1/100 of
a second (10 msec). If the strobe flashes once every 10 msec for a brief
moment, the user sees the flash at the same spot in the rotation of the shaft
and the persistence of the eye remembers this until the next flash making
the shaft appeared to be stopped. As the target is rotating there is some
movement evident during the strobe flash. The longer the flash duration,
the more obvious the rotation is and this increases the blur. The Lamp ON
Mode does not have a brightness setting.
6.1 Calcula ng Blur
Blur can be calculated– if the sha is turning at 6000 RPM, it takes
10 msec to complete one revolu on. If the strobe
fl
ash dura on is
100
μ
sec (1/100 of a millisecond), the sha will turn:
24
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