Basler raL2048-48gm User Manual download pdf (Page 145)

AW00118302000 Acquisition Control

Basler racer GigE 135

8.5 Maximum Allowed

Line Acquisition Rate

In general, the maximum allowed line acquisition rate can be limited by three factors:

 The amount of time it takes to read an acquired line out of the imaging sensor and into the

camera’s frame buffer. Since readout time is fixed, it establishes an absolute maximum for the

line rate. Note that the readout time stays the same regardless of the Width parameter setting

for the frame.

 The exposure time for acquired lines. If you use longer exposure times, you can acquire fewer

lines per second.

 The amount of time that it takes to transmit a completed frame from the camera to your host

PC. The amount of time needed to transmit a frame depends on the bandwidth assigned to the

camera.

To determine the maximum allowed line acquisition rate with your current camera settings, you can

use a parameter called the Resulting Line Rate. The Resulting Line Rate parameter indicates the

camera’s current maximum allowed line acquisition rate taking the readout time, exposure time, and

bandwidth settings into account.

For more information about the Resulting Frame Rate parameter, see Section 5.1 on page 37.

Increasing the Maximum Allowed Line Rate

You may find that you would like to acquire lines at a rate higher than the maximum allowed with

the camera’s current settings. In this case, you must first determine what factor is most restricting

the maximum line rate. The descriptions of the three factors that appear below will let you determine

which factor is restricting the rate.

Factor 1:

Factor 1 is the sensor readout time. The readout time for a particular sensor is a fixed value and

thus the maximum line acquisition rate as determined by the readout time is also fixed. The table

below shows the maximum line rate (in lines per second) based on sensor readout time for each

camera model.

When the camera’s acquisition mode is set to single frame, the maximum possible

acquisition frame rate can not be achieved. This is true because the camera

performs a complete internal setup cycle for each single frame.

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Basler raL2048-48gm User Manual Page 145