Basler L800k, User Manual, Page: 48 / 168

Operation and Features
3-8 BASLER L800
k
Draft
3.4.2 Free Run
3.4.2.1 Basics of Free-run Controlled Operation
In free-run , an ExSync signal is not required. The camera generates its own internal control signal
based on two programmable parameters, “Line Period” and “Exposure Time.” The camera’s
internally generated control signal rises and falls in a fashion similar to an ExSync signal.
In free-run, the camera exposes and outputs lines continuously and the line period parameter
setting determines the camera’s line rate:
In free-run, two modes of operation are available: edge-controlled and programmable.
• In free-run , edge-controlled mode , the pixels are exposed and charge is accumulated over
the full line period (from rising edge to rising edge of the internal control signal). The falling
edge of the control signal is irrelevant. The line is read out and transferred on the rising edge
of the internal control signal (see Figure 3-5). The line period is determined by the setting for
the line period parameter.
The edge-controlled mode will give you the best performance in terms of signal-to-noise ratio.
Figure 3-5: Free-run, Edge-controlled Mode
• In free-run , programmable mode , the pixels are exposed and charge is accumulated when
the internal control signal is low. The line is read out and transferred on the rising edge of the
internal control signal (see Figure 3-6).
In this mode, the line period is determined by the setting for the line period parameter. The
exposure time parameter setting determines how long the control signal will be low and thus
determines the exposure time.
Figure 3-6: Free-run, Programmable Mode
Line Rate
1
Line period
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