FLIR Alpha Nir User Manual page 14

Alpha NIR User's Guide 412-0007-10 Ver 150
The ext_sync period (time between rising edges) must be greater than 33.47ms (29.87 Hz
frame rate max), in both Normal and Short modes. There is no maximum period. Periods
less than the specified limit will result in the camera ignoring ext_sync inputs.
When the camera is not in External Sync mode, the ext_sync input is unused.
Ext Sync
Integration
T Minimum width of pulse = 100ns
WID
T Minimum period of ext_sync = 33460µs
PER
Normal Mode Timing
T Delay from Rising edge of Ext Sync to Start of Integration
START
36 + (count*16) ± 8.5 clocks (where count is from Normal Integration Counter)
T Delay from Rising edge of Ext Sync to End of Integration
END
822076 ± 8.5 clocks (33492 ± 3.7us)
Special Short Mode Timing
T Delay from Rising edge of Ext Sync to Start of Integration
START
11.5 + (count*16) ± 8.5 clocks (where count is from Short integration counter)
T Delay from Rising edge of Ext Sync to End of Integration
END
419.5 ± 8.5 clocks (17.09 ± 0.35us)
Clock = 1/24545450Hz = 40.74075ns
T
WID
T
END
T
START
T
WID
T
PER
13
INDIGO OPERATIONS