CV-M9 GE
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8.3.6. Electronic Shutter
The CV-M9GE has two conventional shutter functions, Preset Shutter and Programmable
Exposure, as well as the GenICam standard “Exposure Time Abs” function:
Preset shutter (Register 0xA004)
12 pre-set (fixed) shutter speeds, OFF (1/30); 1/60; 1/100; 1/120; 1/250; 1/500; 1/1,000;
1/2,000; 1/4,000; 1/10,000; 1/16,000 and 1/50,000, can be selected by this function.
Programmable Exposure (Register 0xA008 - common setting)
The shutter speed can be set by 1L increments in the range of 0.5L to 791L. 791L corresponds to
shutter OFF (1/30). L=42.07µs (line period) for full frame and partial scan.
Programmable Exposure (Registers 0xA00C [Red], 0xA010 [Green] and 0xA010 [Blue])
Individual shutter settings for R, G or B channels are available for Continuous and Edge Pre-
Select (EPS) trigger modes only.
The actual exposure time should add 0.5L in addition to setting lines number due to 0.5L
overhead in the range of 0L to 790 L.
Shutter speed (Time) for Trigger Mode
Minimum exposure time
Max. exposure time
Normal
Partial
20
μ
s
Continuous
and EPS
V-Binning
30
μ
s
1 Frame(note 1)
Normal
Partial
42.07
μ
s×2L
＋
20
μ
s(0.5L) = 66.7
μ
s
(
≈
1/10,000s)
PWC
V-Binning
50.96
μ
s×2L
＋
30.
μ
s(0.5L) = 131.7
μ
s
(
≈
1/8,000s)
60 Frame
(Note 1 )
Note1): The maximum shutter time depends on total lines of each read out system.
Exposure time for Normal Readout
= PE(Line) x 1H(42.07us) + 20us (PE=0
～
791)
Exposure time for 1/2 Partial Readout
= PE(Line) x 1H(42.07us) + 20us (PE=0
～
491)
Exposure time for 1/4 Partial Readout
= PE(Line) x 1H(42.07us) + 20us (PE=0
～
347)
Exposure time for 1/8 Partial Readout
= PE(Line) x 1H(42.07us) + 20us (PE=0
～
275)
Exposure time for V-Binning Readout
= PE(Line) x 1H(50.96us) + 30us (PE=0
～
395)
Exposure Time Abs (Register 0xA054)
This is a function specified in the GenICam standard.
The shutter speed can be entered as an absolute exposure time in microseconds (
μ
s) in register
address 0xA054. The entered absolute time (Time Abs) is then converted to programmable
exposure (PE) value inside the camera.
In this mode, the minimum exposure time is 20 µs and then after, the shutter value is changed
by 42 µs increment.
The relation with PE value is:
PE =
INT (Exposure time / 42) for Normal Readout, 1/2 Partial to 1/8 Partial mode
PE =
INT (Exposure time / 51) for V-Binning Readout mode
Note: “INT” means integer (truncated).
