Instruction manual

Controlling image capture
9.2 Exposure time
The exposure (shutter) time for continuous mode and Trigger_Mode_0 is based on the following
is multiplied by the time base register value (see TIMEBASE). The
formula:
Shutter register value x timebase + offset
The register value is the value set in the corresponding IIDC register (SHUTTER [81Ch]). This
number is in the range between 1 and 4095.
The shutter register value
default value here is set to 20 µs.
A camera-specific offset of 24 to 43 µs is also added to this value.
Example
Camera: MF-033
mebase: 20 µs
en 10 µs + 24 µs = 34 µs.
e exposure time for long-term integration of up to 67 sec can be extended via the
Register value: 100
Ti
100 x 20 µs + 24 µs = 2024 µs exposure time.
The minimum adjustable exposure time set by register is 10 µs. => the real minimum exposure
time of an MF-033 is th
9.2.1 Extended shutter
Th
EXTENDED_SHUTTER register.
Register Name Field Bit Description
0xF100020C EXTD_SHUTTER q Indicates presence of
this feature (read
only)
Presence_In [0]
] --- [1.. 5
me Exposure time in µs ExpTi [6..31]
Table 48: Extended shutter configuration
The longest exposure time, 3FFFFFFh, corresponds to 67.11 sec.
l-to-pixel non uniformity. Depending on the
application, these effects may limit the longest useable integration time.
 Changes in this register have immediate effect, even when the camera is transmitting.
 Extended shutter becomes inactive after writing to a format/mode/frame rate register.
 Exposure times entered via the 81Ch register are mirrored in the extended register, but
not vice versa.
 Longer integration times not only increase sensitivity, but also may increase some
unwanted effects such as noise and pixe
MARLIN Technical Manual
Page 96