IL3 User’s Guide
page 46
11S-3002B
Figure 5-5: Sync Out Per Frame
5-2 Sync Out
Per Frame
External devices such as additional cameras,
strobe lights, and test instruments may be
synchronized via Sync Out pulses from the.
The “Per Frame” option output is one pulse
per frame--the sync pulse rate is equal to the
recording frame rate.
T
o set up Sync Out:
1. Open the Record Controls tab and locate
the Sync Out controls.
2. Click on the check box to enable Sync Out.
3. The signal can either be
Active High
, meaning the signal goes high when the shutter opens, or
Active Low
, meaning the signal goes low with when the shutter opens. Select Active High or Low
from the dialog box.
4. The signal can either follow the Shutter (integration time) or you can select Duty Cycle and
control the % of frame time (1/frame rate) for the active portion of the signal using the number
box provided.
Per Second
If you choose the “Per Second,” the camera will output a 1Hz signal. The only active options in this
mode are Active High and Active Low.
Each Camera derives an internal clock
from the 1Hz “Per Second” input
signal, (from either the Sync-In or IRIG
inputs), which it can use to run at any
desired rate, as in normal operation.
A small correction may be done at the
inter-frame time of the last frame in
any given second (see the “alignment
correction” on the diagram).
Camera 1 is set with a 1x shutter. The
exposure time is 1/fps - 6
m
sec.
Camera 2 is set at the same frame rate
as Camera 1, but with a shorter expo
-
sure. Note that the frame alignment is
at the end of each exposure, not the
beginning as with per-frame sync.
Camera 3 is set at a slightly faster
frame rate than cameras 1 and 2. Note
that the end of the exposure of the
last frame of the second will be aligned
with cameras (slightly skewed) 1 and 2.
Sync timing between camera 3 and the
other two cameras will phase in and
out depending on the frame rates.
Figure 5-4: Sync: Per Second Timing
