8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 91
1) The polarity of lines can be set to inverted or not inverted, and the default setting is not inverted.
2) Improper signal can be filtered by setting appropriate value to trigger filter. Raising edge filter and
falling edge can be set separately. The range is from 0 to 5000
μs. The default configuration is not use
trigger filter.
3) The time interval between trigger and exposure can be through the trigger delay feature. The range of
time interval covers from 0 to 3000000μs. The default value of trigger delay time is zero.
The features, like trigger polarity, trigger delay and trigger filter, can be select in the GalaxyView.
The camera's trigger source Line0 use opto-isolated circuit to isolate signal. Its internal circuit
delay trigger signal and rising edge's delay time is less than falling edge's. There are a dozen clock
cycles delay of rising edge and dozens clock cycles delay of falling edge. If you use Line0 to trigger
the camera, the positive pulse signal's positive width will be wider (about 20-40
μs) and the
negative pulse signal's negative width will be narrower (about 20-40
μs). You can adjust filter
parameter to accurately filter trigger signal.
8.2.8. Exposure Time Mode
According to the length of the exposure time, two exposure time modes of the MER2-G camera are
available: Standard exposure time mode and UltraShort exposure time mode.
8.2.8.1. Standard Exposure Time Mode
In Standard exposure time mode, three exposure time adjustment modes are available: manual
adjustment, one-time automatic adjustment and continuous automatic adjustment. The standard exposure
time mode is the default setting. For the manual adjustment, please refer to section 8.2.9. For the automatic
adjustment and continuous automatic adjustment, please refer to section 8.3.4.3.
8.2.8.2. UltraShort Exposure Time Mode
In UltraShort exposure time mode, the MER2-G camera only supports manual adjustment of the exposure
time. Since standard exposure time mode is the default setting, if you want to set the UltraShort exposure
time mode, you first need to adjust the visibility level to guru and set the ExposureTimeMode to UltraShort
under the acquisition control features window, as shown in Figure 8-18.
Figure 8-18 UltraShort exposure time mode
Camera model that support UltraShort exposure time mode:
Model
MER2-041-302GM/C