xiJ - Technical Manual Version 0.06
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For description please see previous page.
Trigger to exposure delay
Mode
TRG voltage [V]
Trigger to exposure delay [us]
XI_US_12_STD_H
5
27.21
XI_US_12_STD_L
5
28.04
XI_US_2_12_CMS_S_H 5
32.05
XI_US_2_12_CMS_S_L 5
32.38
XI_US_2_12_HDR_HL
5
32.38
table 4-6, delay in rolling shutter mode
4.1.6.
Exposure Time
Also known as shutter speed. This parameter defines the length of the integration period for each frame.
Most CMOS sensors generate the exposure interval internally. For some it is possible to control it by external signaling. The
sensor internal timing depends on the provided system clock. Most sensors use dividers to generate slower clocks for internal
usage.
The minimum exposure time is defined mostly by row times, where the row time (T
R
) is dependent on various internal settings.
Very few sensors support exposure times equal to zero. There is a defined minimum exposure time as well as minimum steps
between possible exposure times. There is also a maximum exposure time, defined by sensor architecture.
4.1.7.
Gain
The gain value influences the analog-to-digital conversion process of the image sensor pipeline and acts as a multiplier of the
output signal. Using gain values greater than 0 will increase the pixel intensities but may also increase the overall noise level.
For some camera models the gain can be set in discrete steps only.
4.1.8.
Control Cooling
The scientific grade sCMOS cameras from XIMEA are equipped with Thermoelectric Peltier cooler module, which allows to cool
the sensor to low temperatures minimizing dark current and the related dark current shot noise. Below measurement was
performed on the conditions.
Accuracy was defined as a difference between the maximum and the minimum recorded temperature for 10 minutes after the
sensor temperature reached the target cooling temperature. As it was not measured with an independent thermometer, these
values show only control loop deviations. Power consumption is the maximum power value recorded during the measurement
procedure for a selected mode. All values have been measured on Technical Sample. They are typical and not guaranteed.
Cooling performance measurements
Mode
Ambient
Temp.
[°C]
Exposure [s]
Minimum
Temp. [°C]
Accuracy
[°C]
Max. Power consumption
[W]
XI_US_2_12_CMS_S_H
22
5
-20
0.05
18
table 4-7, cooling performance
