BM-500CL / BB-500CL
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6.1.8.
Partial Scanning
The partial scanning function uses the middle of the image vertically to achieve faster frame rate.
This is effective for capturing and inspecting the image which does not require the height. BM-
500CL/BB-500CL has 4 types of partial scan modes such as 2/3, 1/2, 1/4 an 1/8.
Variable Partial Scan
Additionally, BM-500CL/BB-500CL has variable partial scan. The start line and end line of the
image can be set by the command STL and ETL.
The command PRGP = 1 is used to activate this function.
Line setting
Command
Parameter
Start line
STL =
2 to 2058
End line
ETL =
2 to 2058
The effective read out lines can be calculated from the following formula.
The End line – the Start line + 1
Frame rate calculation
Frame rate ( fps ) = 1/ ( Total LVAL number of 1 frame x 32 µs )
Total LVAL number of 1 frame
= FVAL LOW Upper Fast dump Normal read out Lower Fast dump period
FVAL LOW = 4 ( lines)
Upper Fast Dump period =
+ 2 ( lines )
Note) The first decimal place is rounded up.
Normal read out = The End line – the Start line + 1 ( lines )
Lower Fast Dump period =
+ 7 ( lines )
Note) The first decimal place is rounded up.
Mode
Start line
End line
Frame Rate
Fast Dump
Fast Dump
Normal Scan
2/3
1/2
1/4
1/8
343
515
773
901
1716
1544
1286
1158
19.97 fps
23.93 fps
34.04 fps
43.07 fps