JAI AT-140GE - Manual (Page 32)

AT-140GE
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9.3.4 Vertical Binning (VB)
Vertical Binning mode is a function where the signal charges from 2 adjacent (vertical) pixels
are added together and read out as one pixel. Binning results in half vertical resolution but
higher frame rate and sensitivity. The charge accumulated in 2 adjacent lines is added
together in the horizontal CCD register. This is done by providing two pulses to the vertical
CCD register for each line read out. Vertical binning cannot be used together with partial
scanning.
Fig.24 Vertical Binning
Setting Effective/total
Horizontal
Frequency
Frame rate
Off (No V Binning)) 1040 /1056 21.938 KHz 20.77 frames/sec.
2:1 V Binning 520 / 530 17.447 KHz 32.92 frames /sec.
9.3.5 Electronic shutter (SM)
The AT-140GE has the following shutter modes.
 Programmable Exposure (PE)
The setting command is PE and the exposure time can be controlled from 0L to 1056L in 1
LVAL units (
45.58µs). Calculating actual shutter speed requires adding 0.5L to the
setting value. This is because there is 0.5L overhead.
The resulting range is from 0.5LVAL to 1056LVAL. Setting 1056L is Shutter OFF.
Programmable exposure can be set for R, G and B together or individually in EPS and RCT
modes.
The shutter speed for each operation mode is shown below.
Mode Read Out Minimum shutter speed Maximum
shutter speed
Continuous
Edge Pre-select Full
Partial 22.8 µs at PE=0(1/43,000s) 45.58µs x
1056L=1 Frame
(48.13 ms)
V binning 28.7 μs at PE=0(1/35,000s)
Pulse Width Full
Partial 45.58 µs x 2L+22.9 µs( 0.5L)=
114 µs （≒1/10,000s）(Note)
42 Frames
( 2 seconds ) V Binning 57.32 µs x 2L + 28.7 µs(0.5L)=
143.3µs （≒1/8.000s）(Note)
Note: In Pulse Width mode, the minimum trigger pulse width requires more than 2LVAL.
Horizontal Direction
V
er
ti
ca
l
D
ir
ec
ti
o
n Full
Full
1/2
Binning
Frame rate 25.21 fps
Frame rate 40.98 fps
Normal full scanning
2 line Vertical Binning
H
H
Horizontal CCD Register
S/H Reset
Video
Out
Xsg1
V
er
tic
al CC
D
R
egi
st
er
Pixel