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88 PI-MAX
®
4 System Manual Issue 4
With the exception of Fast Mode/Safe Mode, which is described in full, the following
paragraphs briefly describe these timing parameters. The settings appropriate to the intensifier
mode and selected pulser are discussed in Chapter 6, LightField and Gated Operation.
• Timing Mode
The timing mode parameter refers to the PI-MAX4's synchronization of data
acquisition with an external TTL signal applied to the
Trigger In connector on the
back of the camera or an internal trigger generated by the internal timing generator.
The modes available depend on the selected intensifier mode (
Safe or Gate) and the
selected pulser (
SuperSYNCHRO.)
• Fast Mode/Safe Mode
In WinX, the Fast Mode or Safe Mode selection determines whether the PI-MAX4
will run the experiment according to the experiment timing, with no interruptions
from the computer, or the computer will interrupt the acquisition flow to process
each frame as it is received. Figure 5-22 compares the two modes.
NOTE:
The Safe Mode parameter found on the Timing tab is not the
same as the Intensifier Safe Mode found on the Main tab.
Figure 5-22: Fast Mode/Slow Mode Flow Charts
Stop acquisition
command sent from
computer to camera
Background or
flatfield on?
Background and/or
flatfield correction
performed
Background or
flatfield on?
Background and/or
flatfield correction
performed
Frames
complete?
Frame displayed
During next acquisition
frames are displayed as
time permits
Frames
complete?
Stop acquisition
command sent from
computer to camera
Stop Stop
No
Yes
No
Yes
No
No
Yes
Yes
Cleans performed Cleans performed
Computer programs
camera with exposure
and binning parameters
Computer programs
camera with exposure
and binning parameters
Start Start
Safe Mode Fast Mode
Start acquisition
command sent from
computer to camera
Start acquisition
command sent from
computer to camera
1 frame collected
as per timing mode
1 frame collected
as per timing mode
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