BM-141GE / BB-141GE
39
9. Basic functions
The BM-141GE and BB-141GE cameras are progressive scan cameras with 12, 10 or 8-bit video
output in Gigabit Ethernet. The camera has 1/2, 1/4 or 1/8 partial scanning for faster frame
rates. Vertical binning and Draft mode are also available.
The camera can operate in continuous mode as well as in 6 triggered modes:
-
Edge Pre-select Trigger
(EPS)
-
Pulse Width Control Trigger
(PWC)
-
Reset Continuous Trigger
(RCT)
-
Sequential EPS Trigger
(EPS)
-
Delayed readout EPS Trigger
(EPS)
-
Delayed readout PWC Trigger
(PWC)
Depending on the timing of the trigger input in relationship to FVAL (camera internal Frame
valid clock), the start of exposure can be immediate (no-delay, LVAL asynchronous) or
delayed until next LVAL (LVAL synchronous).
In the following section the functions are described in detail.
9.1. Electronic Shutter
BM-141GE / BB-141GE have conventional shutter functions as well as the GenICam standard
“Exposure Time Abs” function.
Preset Shutter
9 steps preset shutter are available: OFF (1/30);
1/60,1/100,1/250,1/500,1/1,000,1/2,000, 1/4,000,1/8,000,1/10,000 sec. (See the register
map included in the SDK documentation for details how to configure this register - 0xA004)
Programmable Shutter
It is possible to set the shutter speed in the range of 2L to 1052L by 1L unit, in case of Full
Frame operation. When1052L is set, it is the equivalent of “OFF (1/30)“ or33.19ms. (See the
register map included in the SDK documentation for details how to configure this register -
0xA008)
Pulse Width Control
When this mode is selected, the exposure time is controlled by the width of the trigger pulse.
The minimum trigger pulse width is equal to 2L (63µs) and the maximum is 2 seconds.
Exposure Auto Continuous (Auto Shutter)
In this mode, the shutter continuously functions in the range of OFF to 1/500 s.
Exposure Time Abs
(GenICam Standard)
This is a function specified in the GenICam standard.
The shutter speed can be entered as an absolute exposure time in microseconds (μs) in
register address 0xA018. The entered absolute time (Time Abs) is then converted to
programmable exposure (PE) value inside the camera.
Minimum Shutter Time 2L
Maximum Shutter Time
Normal
31.551 µs(1L) * 2L = 63.102 µs
31.551 µs * 1052 L≈ 33.192 ms
msms1Frame(66.44ms)
V Binning
37.810 µs * 2L = 75.62 µs
µs
37.810 µs * 527 L ≈ 19.926 ms
Draft
36.879 µs * 2L = 73.759 µs
36.879 µs * 268 L ≈ 9.883 ms
Содержание BB-141GE
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