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Chapter 8 Virtual Chip Mode 107
11. Click on the Load Default Values button. This enters the default ROI values.
These values are: Start pixels of 1,1; End pixels based on the Chip Y and Chip X
dimensions; and Groups of 1.
• Region of Interest: The settings below assume a 47x47 pixel ROI (i.e., the
entire virtual chip). An ROI that is a subset of the virtual chip can be defined.
X Start: 1
Y Start: 1
X End: 47
Y End: 47
X Group: 1
Y Group: 1
• Click on the Download Virtual Chip Definition button. This will
download the definition, set up the ROI, and calculate the readout time.
• Observe the calculated readout time. If you need a shorter period, change the
settings (for example, enter a smaller Y-dimension or use binning in the
Y-direction) and click on the Download Virtual Chip Definition button
again.
• Click on Close.
12. From
the Setup menu, select Environment.
Note: When setting up for focusing, the number of Frames/Interrupt should be
left at 1.
• DMA Buffer (Mb): By default, the buffer size is 8 Mb. Using the following
formula, calculate the amount of DMA memory required:
X × Y × #Frames × (2 bytes/pixel).
For example, the buffer size required for a 47x47 virtual array acquiring
1000 frames would be 47 × 47 × 1000 frames × (2 bytes/pixel) = 4.4 Mb.
If the calculated value is greater than 8 Mb, enter the appropriate size.
Note: This value is not enabled until you restart your computer.
• Frames/Interrupt: If the number of frames is greater than 256 (the pre-
programmed slot limit for a PCI card), increase the number of
Frames/Interrupt value. Use the formula #Frames/256 and round the result
to the next highest integer to calculate that value. For example, 1000
frames/256 will result in 3.9, so enter 4.
Note: This value should be 1 for Focus mode.
13. Click on OK after y
ou have finished entering the Environment settings.
14. Place a suitable target in front of the cam
era and click on Focus to verify that
the camera is seeing the target.
15. Make any
focusing, gain, or other adjustments necessary to fine-tune the image.
16. Stop running in Focus
mode.
17. Now click on Acquire.
Experimental Timing
Triggering can be achieved through the software via the Software Trigger timing mode
(selectable on the
Experiment Setup dialog box, Timing Mode tab page) or it can be