Справочник Пользователя для Sigma LBA-300

Since the perfect camera has not yet been found, we advise most LBA-PC users to operate pulsed 

lasers in Trigger Out mode whenever possible.  Next best choice is the Video Trigger mode.  These 

two modes will produce the most repeatable quantitative results.   

 

The setup for CW timing is the least complex of the setups. Therefore, we  recommend that you use 

CW mode to verify that your camera is correctly installed and is operational.  The basic CW 

installation requires that you set Capture Method to Continuous, and the Capture Interval to 1.   

 

5.1.2.1  Interlaced Cameras  

In CW mode, interlaced cameras will support all available resolution settings and zooming 

capabilities.  The highest of these resolutions will be made up of digitized data from both the odd 

and even fields.  The odd and even data is assembled to form a single image.  If you are 
observing a rapidly changing image at high resolution, you may observe line-to-line image 

breakup.  Reduce your resolution to help stabilize the image.  Some cameras may also exhibit an 

intensity variation from one field to the next.  Most interlaced cameras will yield good high-

resolution images in CW mode. 

 

5.1.2.2  Non-interlaced Cameras  

In CW mode, non-interlaced cameras will support all available resolution settings and zooming 

capabilities.  Most cameras will yield good high-resolution images in CW mode. 

 

Two types of Trigger Out operations are provided.   They are the runs Always and the only While 

Running choices.  With the While Running selection, the triggering of the laser is switched on and 

off by clicking Start!/Stop!.  If you choose the runs Always option, then the trigger output pulses 

will run continuously and independent of data collection. 

 

5.1.3.1  Trigger Interval  

The rate at which trigger output pulses occur is dependent upon the frame rate of the camera 

and the specified Trigger Interval value.  Specifying an interval of 1 will cause the output 
trigger to run at the camera's frame rate (this corresponds to the fastest possible rate).  A value 

of 2 will produce an output pulse on every second video frame. A 3 will pulse on every third 

frame, and so on. 

 
Example:  If you are using a 60 Hz frame rate camera and desire to produce an output pulse once each second, 
program a 60 into the Trigger Interval. 
 

Should you need a high rep rate trigger, select a camera with as fast a frame rate as possible.  

(The frame rate of interlaced cameras is one half the field rate.)  A Trigger Interval value of 1 will 
cause an output pulse to occur once per camera frame.  Thus, an interlaced camera running at a 

Operator’s Manual 

 

LBA-PC 

 

Doc. No. 10654-001, Rev 4.10 

119