JAI RM-2030GE User Manual

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JAI RM-2030GE User Manual Manual pdf 72 page image

OperationTM/TMC/RM/RMC-2030GE- 58 -10.5.3 Asynchronous Programmable Exposure ModeIn Asynchronous Programmable Exposure Mode, when an external trigger is applied, the exposurestarts after one discharge signal (Vsub), which happens after the trigger’s active edge is off. Becausethe discharge signal (Vsub) synchronizes with LDV in this mode, there is a maximum one video line ofjitter between the trigger active edges to discharge signals (Vsub) off. In this mode, the exposuretime from 1 video line to 2080 video lines can be controlled through serial communication commandsin one video line steps. In this mode, the minimum exposure time is equal to 1 video line plus over-head: the maximum exposure time is equal to 2080 video lines plus overhead. Where the specifiedexposure time is n video lines, the real exposure time is equal to:When n=0, the exposure time is minimum exposure time. It is equal to:• If the exposure time is less than one frame time, the maximum trigger frequency is equal to 1/1frame time.• If the exposure time is longer than one frame time, the maximum trigger frequency is equal to 1/exposure time.• The minimum active period of the external trigger is 5μs.Figure 57. Asynchronous Programmable External TriggerExposure Time={ (n+1) *27.5 μs+15.6μs(n+1) *55.0 μs+15.6μsDual TapSingle Tapn = 0,1......1124Minimum Exposure Time={ 43.1 μs (1/26000s)70.6 μs (1/15000s)Dual TapSingle TapWhen n=1124 the exposure time is maximum exposure time. It is equal to:Maximum Exposure Time={ 31.25 μs (1/32s)62.5 μs (1/16s)Dual TapSingle Tap