Rad-icon 1520 GigE User Manual
31
Teledyne DALSA
Trigger Mode
FreeRunning Mode
In this mode the detector will run continuously on internal timing. No trigger input is
required to initiate a frame read-out. The frame rate is determined by the time between
successive frame read-outs which can be set by the Extended Exposure feature.
The Extended Exposure value must be chosen high enough that the bandwidth of the
GigE is below 100MByte/second.
In FreeRunning mode the sensor will integrate and read-out continuously even when the
host does not acquire any images. However the trigger output is suppressed when no
images are acquired, this is useful to see at what moment an integration period will be
acquired and streamed to the host system.
When a grab is started the next integration period will be acquired and sent to the host
system. If a grab is started but the sensor is still in the integration period this frame will
be dropped and the following frame will be send to the host system; this to avoid changes
to the sensor during the integration period (which can happen before acquiring images).
Row
#
Time
ReadOut
Integration
Time
Frame
(
N
)
Frame
(
N
+
1
)
Trigger Input
Trigger Output
Sensor Data Output
B
C
A
Pixel Array
1
2
Full Resolution
Binning 2x2
ROI
A: Integration Time
B + C
B + C
B + C
B: Read-out Time
40 ms
17.5 ms
varies
C: Extended Exposure
21 ms
–
65 sec
12.5ms
–
65sec
0 ms
–
65 sec
