Operation and Features
3-6 BASLER L304kc
Draft
3.3.1.3 Guidelines When Using an ExSync Signal
When using an ExSync signal to control exposure, several general guidelines must be followed:
• The ExSync signal must toggle.
• The ExSync signal period must not be lower than 138.6 µs.
• The ExSync signal must remain high for at least 0.1 µs.
• The minimum exposure time is 10.0 µs. This means that:
In ExSync level-controlled mode, the ExSync signal must remain low for at least 10.0 µs.
In ExSync programmable mode, the programmed exposure time must be at least 10.0 µs.
• In the ExSync Programmable mode:
The maximum allowed programmed exposure time = ExSync signal period - 0.6 µs.
(If you set the exposure time to be longer than this allowed maximum, the camera will behave
as if it is in ExSync edge-controlled mode.)
• When you are controlling exposure with an ExSync signal, using the edge-controlled mode
will give you the best performance in terms of signal-to-noise ratio.
Exposure Start Delay
When an exposure is triggered by the ExSync signal, the actual start of exposure will be delayed.
(This is commonly referred to as an exposure start delay.) The exposure start delay includes two
components: the transfer gate time and the setup time. These times vary depending on the
exposure mode you are using. Table 3-1 shows the transfer gate time and the setup time for each
exposure mode.
For a given exposure mode:
Start Delay = Transfer Gate Time + Setup Time
L
We strongly recommend using an exposure time that is at least 10% of the
ExSync period. Exposure times shorter than 10% of the ExSync period will
increase the non-linearity of the camera’s response.
Exposure Mode Transfer Gate Time Setup Time
Level-controlled 0.0 µs
≤ 0.4 µs
Programmable
0.0 µs
≤ 0.4 µs
Edge-controlled
1.40 µs
≤ 0.4 µs
Table 3-1: Exposure Start Delay Components
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