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Tau 640 User’s Manual
3—Basic Operation of the Tau 640 and GUI
TAU-0640-00-10, version 110
June 2011
3-13
The Tau 640 camera displays an on-
screen symbol called the Flat Field
Imminent Symbol prior to performing an
automatic FFC operation. As shown in
Figure 3-4, it is the square in the upper
right of the video output and is displayed
nominally 2 seconds prior to the FFC
operation. The duration of the FFC
Imminent Symbol can be set using the
FFC Warn Time
setting in the
Analog
Video
tab. Setting the
Warn Time
to less
than 15 turns off the warning (see
paragraph 3.8).
External Sync Mode:
The Tau
640 camera provides the ability to either accept or output
a frame synchronization signal on pin 21 of the 50-pin
Hirose connector or pin 26 of the Photon Replicator
board. This functionality can also be disabled. The designed
signal levels are 0V and 3.3V.
Disabled
: The camera will turn off frame synchronization.
Slave
: The camera will accept a frame synchronization signal on the interface
connector. The camera output will be frozen if the camera is in slave mode and no
external synchronization signal is received.
The focal plane array readout cycle starts when the external synchronization signal is
received and the camera will continue the output cycle until the frame is complete.
The frame sync signal embedded in the respective digital output should be used to
acquire digital data, not the external sync I/O.
Maximum external sync input rates are up to 29.980 Hz for NTSC and 27.25 Hz for
PAL. The ‘Slow Video’ versions of the Tau 640 camera will have the same external
sync frame rates, but the image data output will be at 1/4 the rate (NTSC) or 1/3
the rate (PAL).
Master
: The camera will output a frame synchronization signal on the interface
connector when configured as a master. The output pulse width will be 100 ns at the
standard frame rates (27.970 Hz for NTSC; 25.000 for PAL).
Operating Mode:
The Tau 640 camera will freeze the
analog frame imaged when
Frozen
is selected. Live video
will cease and the frozen frame will persist. To return the
camera to live video, select
Real-Time
video mode.
Save Settings:
After using the FLIR Camera Controller GUI to change
camera modes and settings to your desired values, use the
Save Settings
button to store your current selections as
new
power-up defaults. The next
time the camera is powered, the Tau 640 camera will remember these saved
settings. If you do not click
Save Settings
, the changes you make via the FLIR Camera
Controller GUI will be valid only for the current session. Cycling power to the camera will revert
to the previously saved settings.
Figure 3-4: Flat Field Imminent Symbol