Photometrics Cascade 128, Руководство пользователя, Страница: 27 / 54

16 Cascade User Manual
Readout
Trigger
Exposure
#1 #2 #4 #3
#1 #2 #4 #3
Ignored
Figure 10. Strobe Mode Timing Diagram
Bulb Mode Bulb mode only operates in Non-Overlap mode. In Bulb mode, exposure time
for each frame is determined by the trigger pulse width. Exposure time entered
into the software is ignored in this mode (see
Figure 11 ). If a trigger arrives
during the readout of the previous frame, it is ignored. The shaded areas
denote the idle time between exposures.
Trigger
Exposure
Readout
#1
#1
#2
#2
#3
#3
Ignored
Figure 11. Bulb Mode Timing Diagram
Notes:
1.
When the clocking mode is "Alternate Frame Transfer", the camera can be operated
in "Overlap" or "Non-Overlap" mode as explained previously.
2. When using the trigger-first, strobe, or bulb triggering mode, the camera cannot be
operated in "Overlap" mode.
AIMO / Non-AIMO Camera users can choose to run the Cascade:128+ in either AIMO or non-AIMO
mode. Each of these software-selectable modes of operation provides distinct
performance characteristics:
• AIMO mode suppresses dark current, thereby optimizing camera
sensitivity. Note, however, that this mode of operation will limit full-well
capacity (typical single-pixel full well as high as 250 ke
-
, assuming neither
vertical binning nor on-chip multiplication gain is utilized).
Used as the default setting for Normal and Frame Transfer.
•
Non-AIMO mode optimizes full-well capacity, thus making it possible to
collect maximum signal. Although the typical single-pixel full well will be
higher (up to 500 ke
-
), dark current will also be increased.
Used as the default setting for Alternate Normal and Alternate Frame Transfer.
Note: The Cascade 128 does not utilize Non-AIMO mode of Operation