Princeton Instruments NIRvana-LN, Руководство пользователя, Страница: 74 / 122

74 NIRvana
™
-LN System Manual Issue 4
Figure 8-3: Timing Diagram: External Sync {Readout Per Trigger}
8.2.3 Bulb Trigger {Expose During Trigger Pulse}
When
Bulb Trigger
{
Expose During Trigger Pulse
} timing is selected, the camera
exposure is determined by an external trigger received on the
TRIGGER IN
signal through
the
AUX I/O
port (see Figure 8-1 ) which allows an external timing generator to control the
exposure time of the camera.
In Full Frame mode, the transition from the inactive state to the active state of the external
trigger starts the exposure, while the transition from the active state to the inactive state ends
the exposure.
When the camera is ready to accept the external sync through the
TRIGGER IN
signal, the
Wait for Trigger
{
Waiting For Trigger
} (WFT) signal at the
AUX I/O
port’s
TTL OUT
signal is high (if
WFT
is the selected output signal):
• WFT
goes HIGH immediately after readout (or after
Pre Open
when active.)
• WFT goes LOW when an active edge (+ or – edge depending on the setting) occurs
and the exposure begins.
Figure 8-4 illustrates the timing diagram for
Bulb Trigger
{
Expose During Trigger Pulse
}
mode with the following configuration settings:
•
Non-Overlap Mode;
•
Three Exposure Sequence;
•
No
Pre Open
{
Open Before Trigger
}.
44
11-0
145_0
034
T
RIGGER
I
N
R
ESET
E
XPOSURE
R
EAD
O
UT
I
GNORED
#1 #2
#2
#1
t
TRIG
t
R
I
GNORED
W
AIT
F
OR
T
RIGGER