Basler ace acA1920-155, Руководство пользователя, Страница: 174 / 326

Image Acquisition Control AW00123404000
164 Basler ace USB 3.0
Note that you may have to add additional delays to the exposure start delay:

If you use a hardware signal to trigger image acquisition, you must add a delay due to the input
line response time (for input line Line 1 or the GPIO lines Line 3, Line 4, if configured for input).
Note that such delays are associated with the frame burst start trigger signal and the frame
start trigger signal.

If you use the debouncer feature, you must add the delay due to the debouncer setting.
For more information about the debouncer feature, see Section 5.11.2 on
page 77 .

If you have set a frame start trigger delay, you must add the set delay.
For more information about the frame start trigger delay, see Section 6.4.3.3 on
page 125 .
For example, assume that you are using an acA640-120 camera and that you have set the camera
for hardware triggering. Also assume that you have selected input line Line 1 to accept the
hardware trigger signal, that the input line response time is 1.5 µs, that the delay due to the
debouncer setting for input line Line 1 is 5 µs, and that you set the frame start trigger delay to
200 µs.
In this case:
Total Start Delay =
= Exposure Start Delay (Table 31) + Input Line Response time + Debouncer S Frame Start Trigger Delay
Total Start Delay = 18 µs + 1.5 µs + 5 µs + 200 µs = 224.5 µs
You can determine the sensor readout time by reading the value of the Sensor Readout Time
parameter. The parameter indicates what the readout time will be in microseconds given the
camera’s current settings. You can read the Sensor Readout Time parameter value from within your
application software by using the Basler pylon API. The following code snippet illustrates using the
API to get the parameter value:
double d = camera.SensorReadoutTime.GetValue();
You can also use the Basler pylon Viewer application to easily get the parameter value.
For more information about the pylon API and the pylon Viewer, see Section 3.1 on page 43 .