Basler Vision Technologies A202k - Recommendations for Controlling Exposure in Free-Run Programmable Mode

Operation and Features
BASLER A202
k 3-11
DRAFT
3.2.2.1 Recommendations for Controlling Exposure
in Free-run Programmable Mode
When using the free-run programmable mode to control exposure, several general guidelines
must be followed:
• The minimum setting for Timer 1 is 13 µs.
• The minimum setting for Timer 2 is 35 µs.
• The actual length of the exposure time will be equal to the programmed time plus 77.7 µs.
• In free-run mode, the period of the internal control signal is equal to the sum of the Timer 1
setting plus the Timer 2 setting plus 77.7 µs. If the AOI and Binning features are not being
used, the sum of the Timer 1 setting plus the Timer 2 must be greater then 20.83 ms.
• If the AOI feature is being used, the sum of the Timer 1 setting plus the Timer 2 setting must
be greater than 1/Maximum Frame Rate where the maximum frame rate is determined by the
formula on page 3-27.
• If the binning feature is being used, the sum of the Timer 1 setting plus the Timer 2 setting
must be greater than 1/Maximum Frame Rate where the maximum frame rate is determined
by the formula on page 3-31.
L
If you are using the Camera Configuration Tool Plus to set up the free-run program-
mable mode, the tool will ask you to enter a frame rate and an exposure time. Once
you have entered these numbers, the value for Timer 1 and Timer 2 will be automat-
ically calculated and sent to the camera. If one of the guidelines listed above is vio-
lated, an error message will appear.
L
When the camera is operating in free-run, external control of exposure start is not
possible. In free-run, the camera generates all control signals internally. The camera
determines when each exposure will start and controls the length of the exposure
time.