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Chapter 15 Menus and Dialog Boxes 369
ESABI (Electronic Shutter Active Between Images):
Applies only to the special
Double Image MicroMAX, which can capture two fast full-frame images before
reading out. In this timing mode, the Experiment Setup
Main
tab page sets the
exposure time of the both images. Two triggers are required, one that initiates
the first image capture and a second one to initiates the second image capture,
thus allowing the second capture to be delayed after completion of the first one.
Continuous Cleans:
In addition to the standard “cleaning” of the array that occurs
after the controller is enabled, Continuous Cleans will remove any charge from
the array until External Trigger pulse is detected. Continuous cleaning stops as
soon as the current row is shifted and frame collection begins. See the hardware
manual for additional information.
Triggered Mode (ST-130, ST-138):
Triggered Mode operates in conjunction with
External Trigger operation. It facilitates experiments where a single event is to
be captured. The system continuously acquires and discards data until a TTL
trigger is applied to the Controller’s Trigger In connector. The data from the
acquisition following trigger detection is stored. Note that this mode and
Continuous Cleans provide two different ways of conditioning the array before
externally triggered acquisition in single-event experiments.
Note:
This mode formerly was referred to as the Store Strobe mode and may be
identified by that name in your hardware manuals.
Shutter Mode:
There are three shutter-control modes, as follows.
Open:
Shutter is held continuously open.
Closed:
Shutter is held continuously closed.
Normal:
Shutter opens and closes synchronously with the system timing.
Int Sync (PI-MAX with PTG only):
When selected On, puts the PTG in the internal
sync mode, in which readout cycles are initiated by passing a signal from the
PTG back through the backplane to the Controller acquisition/readout circuits.
This differs from operation with other pulsers/timing generators in which a
readout cycle is initiated by connecting the appropriate signal to the Controller’s
Ext. Sync
connector.
Pre Open:
For most experiments, the shutter should remain open until the trigger or
sync signal is received telling the system to collect an exposure. In experiments
where the event occurs before the shutter would have time to open, Pre Open
operation can be selected to open the shutter before a signal is received. The
shutter will be opened as soon as the system is ready to collect data without
waiting for a synchronizing signal. This mode is best suited to capturing single
“flash” events with a dark field. PreOpen is not available in free-run operation.
Full Speed (sync):
When Full Speed is selected, the system collects data according to
hardware timing. Once collection begins, the system is not controlled by the
computer. The computer will store data and display it as quickly as possible but
may lag behind.