version 1.5 rev 4 Dec 2019
38
Sona &
Marana
4.7.7 R
olling
s
HUtteR
e
xteRnal
e
xposURe
t
RiggeRing
(n
on
-o
veRlap
M
ode
)
On detection of the trigger event a reset read out is initiated, this effectively begins a new exposure. When the external
trigger input goes LOW, a signal frame read out phase begins. When the frame has been read out completely, the Arm
goes high and the camera waits for the next trigger event to be detected.
The
external trigger pulse width
defines the exposure time for all rows but is only coincident with the exposure time for
Row 1. The exposure for Row 2 will be delayed by one row time relative to Row 1 and so forth.
The
period of the external trigger pulse
defines the overall cycle time. If the width of the trigger event is less than 3
Rows the falling edge will be missed, and a subsequent falling edge will be required to end the exposure.
Figure 13: External Exposure “long” (non-overlap)
Parameter
Minimum
Maximum
Exposure
3 Rows
Fire = 2R + 15 μs (12-bit)
= 2R + 10 μs (16-bit)
30 s
Cycle Time (1/Frame Rate)
Ex 1 Frame + 1 Row
-
External Start Delay
0
1 Row
EXT Trig Pulse Width
2 rows
30 s
