JAI TMC-4200GE User Manual download pdf (Page 77)

Page 65

TM-4200GE Hardware

Operation

FIGURE 64. External Trigger Timing.

9.3.4 Asynchronous Programmable Exposure Mode

In Asynchronous Programmable Exposure Mode, when an external trigger is applied, the exposure

starts after one discharge signal (Vsub), which happens after the trigger’s active edge is off. Because

the discharge signal (Vsub) synchronizes with LDV in this mode, there is a maximum one video line of

jitter between the trigger active edges to discharge signals (Vsub) off. In this mode, the exposure time

from 1 video line to 2080 video lines can be controlled through serial communication commands in one

video line steps. In this mode, the minimum exposure time is equal to 1 video line plus overhead: the

maximum exposure time is equal to 2080 video lines plus overhead. Where the specified exposure 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:

When n=2079, the exposure time is maximum exposure time. It is equal to:

• If the exposure time is less than one frame time, the maximum trigger frequency is equal to 1/1

frame 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.

)2079......,1,0(

6.251.58*)1(

6.255.32*)1(

⎩

⎨

⎧

= n

tapSinglessn

tapDualssn

TimeExposure

μμ

⎩

⎨

⎧

tapSingless

tapDualss

TimeExposureMinimum

)12000/1(7.83

)17000/1(1.58

⎩

⎨

⎧

tapSingless

tapDualss

TimeExposureMaximum

)8/1(6.120873

)15/1(6.67625

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JAI TMC-4200GE User Manual Page 77

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