User's Manual

Screen Service SDT 200UB – SDT 500UB ARK-1 ATSC Operations
July, 2009 v 1.0 Page 3 - 70
The tool is prevented to send an “overflowing” amount of data to the device: curve changes
will be applied only when the mouse button is released.
In the module grid, the red curve is used to monitor the current module curve calculating and
saving. The last saved coefficients are locally downloaded from the FPGA runtime memory
registers in order to redraw the curve.
During saving actions are created two nonlinear pre-correction files:
• *.dpre files: files containing digital coefficients values.
• *.apre files: files containing analog coefficients values.
The following buttons allow the management of linear pre-correction files and the
management of the connection to port 5000:
• Save: used to save in the device memory the current curves setting. The previously
saved file will be overwritten except in the event that no files have been saved
before; in this case a dedicated window appears in order to let the user name the
new file.
• Save as: used to save in the device memory the current curves setting. The
previously saved file will be overwritten with a new name. In the event that no files
have been saved before, a new file will be created.
• Read file: used to reload the last saved file.
• Export: used to download pre-correction files on the user PC. A browser window
allows the selection of the saving path.
• Release: releases the connection in order to allow others remote machines to
connect to port 5000 (refer to Connection to port 5000
paragraph).
Note: only the drawn curves have the coefficients written in the FPGA registers and so
savable. A curve not yet drawn takes as default the same shape of the last curve drawn and
visualized, to make it drawn click on the graph.
Files are separately managed in analog and in digital AGC mode.