Basic steps
- Connect to CLAS on-line monitoring
and go to LAC histos (option 6)
Scan ADC (options 1-3) and TDC channels (options 2-4)
- From histograms you can argue the status of LAC according to:
| 1 | holes in the same channel for both ADC and TDC plots: Dead PMT or HV off | check HV status |
| 2 | single hole in TDC plot only: TDC or discriminator channel dead, or disconnected cable | record on log-book |
| 3 | group of 16 holes in TDC plot only: Dead discriminator | record on log-book and call LAC expert |
| 4 | group of 64 holes in TDC plot only: Dead TDC board | record on log-book and call LAC expert |
| 5 | single hole in ADC plot only: ADC channel dead | record on log-book |
| 6 | group of 16 holes in ADC plot only: disconnected cable | record on log-book and call LAC expert |
| 7 | group of 64 holes in ADC plot only: Dead ADC board | record on log-book and call LAC expert |
| 8 | hot ADC channels: pedestal uncorrect | re-load ADC pedestals (ask DAQ) |
| 9 | hot TDC channlels: discriminator's threshold uncorrect | re-load discriminator thresholds |
- connect to HV as described here (serial connection)
- scan all the 4 HV Caen crates and locate the corresponding channel:
- try to switch on and off the channel: when the PMT is working current should be about
500 uA
TDCs discriminators threshold download
- run diman
- choose set channels from file option
- click the exit button.