Basler slA1000-30fm, User Manual, Page: 59 / 166

Image Acquisition Control
Basler scout light 51
6.4 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 on parameter settings for obtaining the maximum possible exposure time, see
Section 6.4.1 on
page 51 .
6.4.1 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 except the slA750-60fm.
On slA750-60fm cameras, the default Exposure Time Base is 31 µs.
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 slA1000-30fm 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 except the slA750-60fm, 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.
On slA750-60fm cameras, you can obtain the maximum possible exposure time (126976 µs) by,
e.g., setting the exposure time raw parameter value to 2048 and the Exposure Time Base Abs value
to 62 µs.
Camera Model Minimum Allowed Exposure Time Maximum Possible Exposure Time
slA750-60fm 124 µs 126976 µs
slA1000-30fm 32 µs 10000000 µs
slA1390-17fm 34 µs 10000000 µs
slA1600-14fm 31 µs 10000000 µs
Table 9: Minimum Allowed Exposure Time and Maximum Possible Exposure Time