Instruction manual
Guppy Technical ManualV7.4.0
238
Configuration of the camera
Extended shutter
•For CCD models and Guppy F-503 with electronic rolling shutter:
The exposure time for long-term integration can be entered with
μs precision via the EXTENDED_SHUTTER register.
– CCD models: max. exposure time up to 67 seconds (3FFFFFFh)
– CMOS Guppy F-503 with electronic rolling shutter: max. exposure
time up to ~2.3 s
•For CMOS models: The maximum exposure time is
(Guppy F-036) 32767 x 29.89 μs = 979.4 ms
(Guppy F-503 with global reset release shutter) ~2.3 s
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.
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 111: Advanced register: Extended shutter
Note
• Exposure times entered via the 81Ch register are mirrored
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 for-
mat / 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.