Allied Guppy, Техническое руководство, Страница: 194 / 238

Configuration of the camera
GUPPY Technical Manual V4.0.1
194
Extended shutter
• For CCD models: The exposure time for long-term integration of up to
67 seconds can be entered with µs precision via the
EXTENDED_SHUTTER register.
• For CMOS models: The maximum exposure time is 32767 x 29.89 µs =
979.4 ms. Although you may enter values with µs precision, the camera
will round down or up to integer multiples of the row time, leaving an
uncertainty of only half of the row time.
The minimum allowed exposure time depends on the camera model. To deter-
mine this value write
1 to the ExpTime field and read back the minimum
allowed exposure time.
The longest exposure time for CCD models is 3FFFFFFh, corresponding to
67.11 sec.
Register Name Field Bit Description
0xF100020C EXTD_SHUTTER Presence_Inq [0] Indicates presence of this fea-
ture (read only)
--- [1.. 5]
ExpTime [6..31] Exposure time in µs
Table 98: Extended shutter configuration register
Note
L
• Exposure times entered via the 81Ch register are mir-
rored in the extended register, but not vice versa.
• Changes in this register have immediate effect, even
when camera is transmitting.
• Extended shutter becomes inactive after writing to a
format / mode / frame rate register.
• Extended shutter setting will thus be overwritten by
the normal time base/shutter setting after Stop/Start
of FireView or FireDemo.