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6.6. Pulse Width Control Mode
In this mode the exposure starts from the leading edge of the trigger pulse, H synchronous or H
a-synchronous. It stops at the trailing edge of the trigger pulse, and the resulting video is read
out. This mode will operate with full and partial scanning and with all binning modes (M4
+
and
M4
+
CL only). Partial scanning and binning in combinations is not allowed. The pulse width control
mode can be used for long time integration.
If smearless read out (SL=1) is used, the exposure starts with a delay 133H after the trigger. The
trigger pulse width should be longer than 133 H (5.23 msec.)
An EEN pulse will indicate the active accumulation time, and a FEN pulse indicates that the
resulting video is read out.
To use this mode:
Set function: Trigger mode “Pulse Width Control” TR = 2
“H synchronous trigger” HC=0, HC=1
“Smearless readout” SL=0, SL=1
Polarity and other functions
Input: Ext. trigger to LVDS/Camera Link or pin 10 on 12-pin connector.
Important notes on using this mode.
• The duration of the trigger can be >2H to ∞. (>72.64µsec.). Thermal noise and dark
current noise will increase by accumulation time, therefore the exposure time is not
recommended to exceed 2 seconds.
• The minimum trigger interval should be >(exposure time + 1 frame). A new trigger must
not be applied during the previous frame read out. (Before FEN is high).
Fig. 22. Pulse Width