Alpha NIR User’s Guide 412-0007-10 Ver 150
INDIGO OPERATIONS
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.
Integration
Ext Sync
T
END
T
START
T
PER
T
WID
T
WID
Minimum width of pulse = 100ns
T
PER
Minimum period of ext_sync = 33460µs
T
WID
Normal Mode Timing
T
END
Delay from Rising edge of Ext Sync to End of Integration
822076 ± 8.5 clocks (33492 ± 3.7us)
T
START
Delay from Rising edge of Ext Sync to Start of Integration
36 + (count*16) ± 8.5 clocks (where count is from Normal Integration Counter)
T
END
Delay from Rising edge of Ext Sync to End of Integration
419.5 ± 8.5 clocks (17.09 ± 0.35us)
T
START
Delay from Rising edge of Ext Sync to Start of Integration
11.5 + (count*16) ± 8.5 clocks (where count is from Short integration counter)
Special Short Mode Timing
Clock = 1/24545450Hz = 40.74075ns
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