Image Acquisition Control
92 Basler pilot
8.4.1 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. 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 value is set to 100,
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 parameter
value to 10000000 µs.
Changing the Exposure Time Base
By default, the Exposure Time Base is fixed at 20 µs, and the exposure time is normally adjusted
by setting the value of the Exposure Time Raw parameter. 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. The exposure
time base can be changed in 1 µs increments and the default is 20 µs.
You can set the Exposure Time Raw and Exposure Time Base 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( 200 );
For detailed information about using the pylon API, refer to the Basler pylon Programmer’s Guide
and API Reference.
You can also use the Basler pylon Viewer application to easily set the parameters.
For more information about the pylon Viewer, see Section 3.1 on page 29.
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