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SP-5000M-CXP2 / SP-5000C-CXP2
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7. Operating modes
7.1. Acquisition control (change the frame rate)
7.1.1 Acquisition frame rate
With Trigger OFF (free running mode – see section 7.2.1), the default frame rate of the camera is
based on the specified ROI. The smaller the ROI, the faster the default frame rate. However, it is
possible to specify a free-running frame rate (i.e., no trigger needed) that is slower than the default
rate. This can be useful when a longer exposure time is needed for a specific ROI.
Modification of the frame rate is done by entering a value in the AcquisitionFrameRate control
corresponding to frequency to be allocated to each frame period. Allowed values range from 36290
Hz to 0.125 Hz for SP-5000M-CXP2, however if the value entered is less than the time required for
the default frame rate, the setting is ignored and the default frame rate is used. For example, the
minimum frame period for the smallest possible ROI (1 line) requires 36290 Hz, so any entry more
than 36290 will always be ignored.
The setting range in Acquisition Frame Rate is:
Shortest
to
Longest
Inverse number of time
required to drive all pixels
in the area set by ROI
command or
inverse number of time
required to transmit one
frame data
to
0.125 Hz = 8 seconds
For the above setting, Acquisition Frame Rate (unit: fps or Hz) is used.
Acquisition Frame Rate: 36290 Hz to 0.125 Hz
How to set:
ROI should be set first.
The number shown in Acquisition Frame Rate will correspond to the minimum frame
period for the specified ROI.
The value can be decreased up to 0.125 Hz.
If ROI is changed from a smaller size to a larger size, the default frame rate of the ROI
is automatically recalculated inside the camera and changed to the slower frame rate of
the larger ROI.
7.1.2 Calculation of frame rate
The frame rate for a specific ROI is calculated using the following formula.
HEIGHT and Width are the size of ROI.
C
EXP_B
、
C
EXP_F
、
C
H
and
F
SYS
are listed in the table.
T
EXP_B
(
µs)
= C
EXP_B
/ F
SYS
T
EXP_F
(
µs)
= C
EXP_F
/ F
SYS
T
ROW
(
µs)
=
C
H
/ F
SYS
T
wait
(
µ
s)
= T
ROW
x 2
K
= ceil(T
EXP_B
/ T
ROW
) + 1.0
EX
R
= 2
EX
C
= 1