Basler A202k User's Manual Supplement - Draft
Supplement
Basler A202k High Gain
17
DRAFT
7
Exposure Control Recommendation
Changes
The User’s Manual for standard A202k cameras contains a set of “Recommendations for
Controlling Exposure in ExSync Programmable Mode” and a set of “Recommendations for
Controlling Exposure in Free-run Programmable Mode”. The recommendations for A202k High
Gain cameras are different from standard cameras. The recommendations for high gain cameras
are listed below.
For ExSync Programmable Mode
If you are using an A202k High Gain camera that is set for ExSync programmable exposure
control, follow these guidelines.
• The ExSync signal must toggle.
• The ExSync signal must remain high for at least 4 µs.
• The minimum setting for Timer 1 is 13. (This represents 13 x 0.8889 µs or 11.56 µs.)
• The programmed exposure time must be less than the ExSync signal period.
• If the AOI and Binning features are not being used, the minimum ExSync signal period is
23.0 ms.
• If the AOI is being used, the minimum ExSync period is equal to 1/Maximum Frame Rate
where the maximum frame rate is determined by the formula that appears on page
of this
supplement.
• If the binning feature is being used, the minimum ExSync period is equal to 1/Maximum
Frame Rate where the maximum frame rate is determined by the formula that appears on
page
of this supplement.
For Free-run Mode
If you are using an A202k High Gain camera that is set for Free-run exposure control, follow these
guidelines.
• The minimum setting for Timer 1 is 13. (This represents 13 x 0.88889 µs or 11.556 µs.)
• The minimum setting for Timer 2 is 42. (This represents 42 x 0.88889 µs or 37.333 µs.)
• The actual length of the exposure time will be equal to the programmed time plus 89.9 µs.
• In free-run mode, the period of the internal control signal is equal to:
[ (Timer 1 setting + Timer 2 setting) x 0.88889 µs ] + 89.9 µs
If the AOI and Binning features are not being used, Timer 1 and Timer 2 must be set so that
the result of this formula is greater than 23.0 ms.
• If the AOI is being used, the period of the internal control signal (as determined by the above
formula) must be greater than 1/Maximum Frame Rate where the maximum frame rate is
determined by the formula that appears on page
of this supplement.
• If the binning feature is being used, the period of the internal control signal (as determined by
the above formula) must be greater than 1/Maximum Frame Rate where the maximum frame
rate is determined by the formula that appears on page
of this supplement.