Image Acquisition Control
Basler ace GigE 93
7.6 Setting the Exposure Time
All Models Except the acA2500gm/gc
If you are operating the camera in any one of the following ways, you must specify an exposure time
by setting the camera’s Exposure Time Abs parameter:
îš„ the frame start trigger mode is set to off
îš„ the frame start trigger mode is set to on and the trigger source is set to software
îš„ the frame start trigger mode is set to on, the trigger source is set to line 1, and the exposure
mode is set to timed.
The Exposure Time Abs parameter must not be set below a minimum specified value. The minimum
setting for each camera model is shown in Table 8.
The maximum possible exposure time that can be set is also shown in Table 8.
The Exposure Time Abs parameter sets the exposure time in µs. The parameter can be set in
increments of 1 µs.
You can use the Basler pylon API to set the Exposure Time Abs parameter value from within your
application software. The following code snippet illustrates using the API to set the parameter value:
// Set the exposure time to 3000 µs
Camera.ExposureTimeAbs.SetValue( 3000 );
This section (Section 7.6) describes how the exposure time can be adjusted
"manually", i.e., by setting the value of the exposure time parameter.
The camera also has an Exposure Auto function that can automatically adjust the
exposure time. Manual adjustment of the exposure time parameter will only
work correctly if the Exposure Auto function is disabled.
For more information about auto functions in general, see Section 10.9.1 on
page 211.
For more information about the Exposure Auto function in particular, see
Section 10.9.3 on page 220.
Camera Model Minimum Allowed
Exposure Time
Maximum Possible
Exposure Time
acA640-90gm/gc 17 µs 1000000 µs
acA640-100gm/gc 4 µs 1000000 µs
acA750-30gm/gc 30 µs 1000000 µs
acA1300-30gm/gc 16 µs 1000000 µs
acA1600-20gm/gc 25 µs 1000000 µs
Table 8: Minimum Allowed Exposure Time Setting and Maximum Possible Exposure Time Setting
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