Basler GigE VISION CAMERAS User Manual page 126

Acquisition Control
Line Acquisition While Obeying Timing Limits
When strictly obeying the following timing limits you can avoid overtriggering in "overlapped mode"
and "non-overlapped mode" without having to monitor the camera's acquisition status (see also
Fig. 42 and Fig. 43 below). You must ensure that the following four conditions are fulfilled at the
same time:
Condition one: The exposure time E is

This is the minimum allowed exposure time also given in Section 8.2.5 on
Condition two: Period F is

immediately after the exposure.
The constant C expresses the duration of exposure overhead. Exposure is not possible during
1
this period. Its default value equals 5.4 µs. However, when the parameter limit is removed from
the Exposure Overhead parameter (see Section 8.3 on
Accordingly, F must be
removed from the Exposure Overhead parameter.
Condition three: ExLSTrig Signal Period

Condition four: Make sure the ExposureOverlapTimeMax parameter value is set to the

appropriate value:
appropriate ExposureOverlapTimeMax parameter value =
= minimum allowed line period - duration of exposure overhead (i.e. C
i.e. minimum F value).
Note: The maximum allowed exposure time E that is compatible with the maximum line rate is
equal to the appropriate ExposureOverlapTimeMax parameter value.
It follows that
if you increase the ExposureOverlapTimeMax parameter value above its appropriate value

while maintaining the trigger signal period, the minimum value for the duration of the
exposure overhead would be ignored and trigger signals can be considered overtriggers
when in fact they are not.
if you decrease the ExposureOverlapTimeMax parameter value below its appropriate value

you would have to increase the duration of the exposure overhead and thereby increase the
line rate.
When you want to operate the camera at the maximum allowed line rate and
have set the ExposureOverlapTimeMax parameter value to the appropriate
value (see above) you can vary the exposure time E within a range of values
between 2 µs and the applicable maximum allowed exposure time E (see
condition four).
118

2 µs.

C (for C values, see Section 8.5 on
1 1

5.4 µs in the general case, and

Minimum allowed line period.
page
page 134); period F follows
page 110), C equals 3.4 µs.
1

3.4 µs when the parameter limit is
,
1
AW00118303000
92.
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