How to adjust discriminator threshold on HCAL DAC

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How to adjust the VME DAC BBCAL discriminator thresholds

  • Log into daq@enpcamsonne with the usual DAQ password
 ssh daq@enpcamsonne
  • Go to test_fadc
  • Execute the command


  • After executing the command, the a new DAC gui should pop up which has instructions to load, initialize and save the settings and adjust the thresholds. The terminal in which the command was executed should also give a readout of all the channels.


  • Click on "Load mpv04Library tab" to load a library
  • Click on "Initialize mpv04" to initialize the library
  • Click on "Save settings" to save the settings
  • Go to the "Enter New Voltage Setting (Volts)" slot and enter the desired threshold
  • Click on "Set Voltage" after entering the desired threshold.
  • Make sure that BBCal Hi Discriminator 1 and BBCal Hi Discriminator 2 have the same value entered
  • Check the online gui on to make sure that the entered thresholds are indeed registered.