Image Acquisition Control AW00011916000
142 Basler scout GigE
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 except the scA750-60.
On scA750-60 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 scA640-70 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 scA750-60, 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 scA750-60 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.
Changing the Exposure Time Base
Normally, the exposure time is adjusted by setting the value of the Exposure Time Raw parameter
as explained above. However, if you require an exposure time that is longer than what you can
achieve by changing the value of the Exposure Time Raw parameter alone, the Exposure Time
Base Abs parameter can be used to change the exposure time base.
The Exposure Time Base Abs parameter value sets the exposure time base in µs and this
parameter can be used to change the exposure time base.
On all camera models except the scA750-60, the default exposure time base is 20 µs and the time
base can be changed in increments of 1 µs.
On scA750-60 cameras, the default exposure time base is 31 µs and the time base can be changed
in increments of 31 µs.
You can set the Exposure Time Raw and Exposure Time Base Abs parameter values from within
your application software by using the pylon API. The following code snippet illustrates using the
API to set the parameter values:
Camera.ExposureMode.SetValue( ExposureMode_Timed );
Camera.ExposureTimeRaw.SetValue( 100 );
Camera.ExposureTimeBaseAbs.SetValue( 186 );
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