User`s manual

AW00104701000 Image Acquisition Control
Basler scout light GigE 121
9.7 Exposure Time Parameters
Many of the camera’s image acquisition modes require you to specify an exposure time. There are
two ways to set exposure time: by setting "raw" values or by setting an "absolute value". The two
methods are described below. You can use whichever method you prefer to set the exposure time.
The exposure time must not be set below a minimum specified value. The minimum exposure time
varies by camera model as shown in Table 9.
The maximum exposure time that can be set also varies by camera model as shown in Table 9.
For information about parameter settings for obtaining the maximum possible exposure time, see
Section 9.7.1 on page 121.
9.7.1 Setting the Exposure Time Using "Raw" Settings
When exposure time is set using "raw" values, the exposure time will be determined by a
combination of two elements. The first element is the value of the Exposure Time Raw parameter,
and the second element is the Exposure Time Base. The exposure time is determined by the
product of these two elements:
Exposure Time = (Exposure Time Raw Parameter Value) x (Exposure Time Base)
By default, the Exposure Time Base is fixed at 20 µs on all camera models.
Typically, the exposure time is adjusted by setting only the Exposure Time Raw parameter. The
Exposure Time Raw parameter value can range from 1 to 4095. So if the parameter value was set
to 100 on an slA640-74 camera, for example, the exposure time will be 100 x 20 µs or 2000 µs.
Settings for Obtaining the Maximum Possible Exposure Time
On all camera models, you can obtain the maximum possible exposure time (10000000 µs) by
setting the Exposure Time Raw parameter value to 1 and the Exposure Time Base Abs value to
10000000 µs.
Camera Model Minimum Allowed Exposure Time Maximum Possible Exposure Time
slA640-74gm/gc 24 µs 10000000 µs
slA780-54gm/gc 26 µs 10000000 µs
slA1390-17gm/gc 34 µs 10000000 µs
slA1400-17gm/gc 38 µs 10000000 µs
Table 9: Minimum Allowed Exposure Time and Maximum Possible Exposure Time