Maximum Allowed Frame Rate - Basler acA2040-55 User Manual

Image Acquisition Control

6.10 Maximum Allowed Frame Rate

In general, the maximum allowed acquisition frame rate on any ace USB 3.0 camera can be limited
by several factors:
The exposure time for the acquisition of frames. If you use very long exposure times, you can

acquire fewer frames per second.
The amount of time it takes to read an acquired frame out of the imaging sensor and to prepare

it for transmission out of the camera. The amount of time varies with the height of the frame.
Frames with a smaller height take less time. The frame height is determined by the camera's
ROI Height setting.
For some cameras, you can select a fast sensor readout mode, that allows you to increase the
frame rate. This can, however, have adverse effects on image quality. For more information, see
Section 6.6.1.1 on
The amount of time it takes to transmit an acquired frame from the camera to your host

computer. The more bandwidth is assigned to the camera the smaller is the amount of time
needed to transmit a frame.
For some cameras, you can increase the bandwidth beyond the default limit. For more information,
see Section 1.2 on page 2
If the global reset release shutter mode on acA1920-25um/uc, acA2500-14um/uc,

acA3800-14um/uc, and acA4600-10uc cameras is selected, overlapped image acquisition is
not possible. This decreases the camera's maximum allowed frame rate.
For more information about the global reset release shutter mode, see the "Global Reset
Release Mode" Section 6.6.2.2 on
When more than one camera is connected to a computer, bandwidth limitations can decrease

the maximum possible frame rates. The extent of the decrease depends on the camera
model(s), the number of cameras connected to the computer, and the computer's (mainboard)
chipset.
Frame rate decrease is particularly likely for cameras delivering high data rates such as the
acA2040-90um/uc and acA2000-165um/uc.
For more information and recommended powerful chipsets see the Application Note USB 3.0
Host Controllers' Maximum Bandwidth Measurements (AW001260). You can download the
document free of charge from the Basler website:
There are two ways for determining the maximum allowed acquisition frame rate with your current
camera settings:
You can use the online frame rate calculator found in the Support section of the Basler website

(Support > Tools > Frame Rate Calculator):
www.baslerweb.com
You can use the Basler pylon API to read the value of the camera's Resulting Frame Rate

parameter (see the next page).
For more information about Image ROI Height settings, see Section 7.6 on
178
page 144.
page 148.
www.baslerweb.com
page
AW00123409000
208.
Basler ace USB 3.0