Teledyne Princeton Instruments Lansis, System Manual

Page: 58 / 101

58 Lansis
®
System Manual Issue 1
EAR99 Technology Subject to Restrictions Contained on the Cover Page.
9.2.1.2.4 Open Before Trigger
Figure 9-11 illustrates the timing diagram for Start On Single Trigger mode combined
with Open Before Trigger shutter mode.
NOTE:
In Figure 9-11 , jitter associated with the cleaning pattern is
omitted for clarity. See Figure 7-4 for jitter information.
Figure 9-11: Full Frame Timing Diagram: Start on Single Trigger, Open Before Trigger
9.2.1.3 Readout Per Trigger
With Readout Per Trigger, all exposures are synchronized with an incoming trigger
pulse. Synchronization occurs on either the Rising Edge or Falling Edge of the trigger
pulse which is configured using the Trigger Determined By parameter on the Trigger In
expander. Refer to
Section 9.2.2, Trigger Determined By , on page 65 for complete
information.
Supported Shutter modes are:
• Normal ;
• Always Closed ;
• Always Open ;
• Open Before Trigger .
The effect each of these shutter modes has on experiment synchronization is described
in the following sections.
NOTES:
1. When Clean Until Trigger is enabled, an inherent jitter is
introduced into the system Refer to Section 7.3.1, Clean
Until Trigger , on page 41 for additional information.
2. In all timing diagrams, Trigger Determined By Rising
Edge is illustrated.
** If Enabled
READOUT
t
O
t
C
t
O
TRIGGER
SHUTTER
Open Before
Trigger
Wait For
Trigger
Pgm’d
Cleans
Clean Until
Trigger **
ACQUIRE
EXPOSE
t
exp
t
R
441
1-0
174_
0
09
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