Allied International V2.4.0 Manual Do Utilizador

 OSCAR Technical Manual V2.4.0

110

Use Format_7 Mode_0 when a strobe light flashes moving objects. The 
exposure for the two (three: F-810C) fields starts concurrently so that the 
strobe freezes odd and even lines at the same time. Field one is read out first, 
field two (and three) are read out after field one. Make sure that the ambient 
light can be neglected, otherwise it will contribute to the illumination of the 
scene and introduce image oddities.

The following diagram illustrates this mode.

 Figure 50: Joint shutter mode

L

•

Changing the shutter time only affects the first field. 
The second (and third) field has a constant shutter time 
of one (two) field length(s).

•

Combining joint shutter with one-shot operation, it can 
also be seen from the above figure that the frame rate 
in one shot mode is lower than in continuous mode. 
This is a result of the additional delay of one or two 
(Oscar F-810C) fields before the progressive output of 
the camera can start. 

External trigger input (after inverting optocoupler)

Shutter first 

field

Output first field to camera 

buffer

Single shot: time between trigger and availablity of image

Output second field to 

camera buffer

Shutter first 

field second

frame

External trigger input

Shutter second field

Cont. mode: time between trigger and availablity of image

Progressive output of camera