Table of contents
Everytime a new DBC firmware version is installed (PFB or tunable) the calibration parameters must be determined.
1) Inject a noise signal into all of the DBBC boards (e.g. use a splitter)
2) Start the DBBC firmware (PFB or DDC) and wait until programming is finished
3) Adjust the power levels to around 10000
- PFB mode
In the DBBC2 client manually set the attenuation (e.g. 20) until you reach a target of 10000 counts.
dbbcifa=1,20,1
Check the counts with:
dbbcifa
Change attenuation and repeat until the target has been reached. Repeat for all boards.
- DDC mode
In the DBBC2 client manually adjust the attenuation (e.g. 20) for all BBCs until you reach a target of 10000 counts.
dbbcgain=all,20,20
check the counts with:
dbbcgain
Change attenuation and repeat until the target has been reached
4) start the calibration
- PFB mode:
calibration
- DDC mode:
calibration=all
5) Update the configuration file
A file containing the results is produced in c:\ (e.g. DATE-calib.txt) by the calibration command. Inspect or plot the DATE-calib.txt file and search for the minimum between the two peaks.Insert the minimum values into the configuration file e.g. c:\DBBC_CONF\dbbc_config_file_104.txt (file name varies depending on the version). Edit the line just above CAT2 entry.
