GAMS ADC Pedestals and current status

Pedestals

Click on image to see more details

Module	01	02	03	04	05	06	07	08	09
	10	11	12	13	14	15	16	17	18
Crate 0
Crate 1
Crate 2
Crate 3
Crate 4
Crate 5

Legend

• Each picture contains histograms of pedestal data from 16 channels of one LE19 module in an ADC crate.
  
• Each crate contains 18 modules, except crate #5 wich has only 14 modules.
  
• Histogram is centered over the mean value.
  
• Fill color is used to enhance visual recognition:
  

  Color	Meaning
  Green	OK
  Black	Mean value < 100 or RMS < 0.001
  Blue	Mean value > 300 or RMS > 1.0
  Red	Mean value > 500 or RMS > 2.0
  White	Number of entries < events taken
  Yellow	Number of entries > events taken

List of current problems

• Some modules give channels in wrong order, like 1,2,3...15,0 instead of 0,1,2...15
• This behaviour was fixed in Crate #1 by increasing +5V a bit
• Crate #4 has problems with channel numbers in some modules
• Lots of wide (RMS > 2.0) channels

Common errors

• No data from channel - module gives wrong channel or module numbers, check module.
• Number of entries is more/less than in other channels - bad channel numbers, check module and crate power.
• RMS=0.0 - this means that LE19 TDC do not have signal from LE14 and give old results, check cable.
• No data from whole crate - no trigger, no clock for one or all LE19. Check SUMMA crates.

How to get pedestals

1. Switch on all 6 ADC MISS crates, 2 LV Analog Crates and 2 SUMMA crates on top.
2. Login to pcbec5 as user roger.
3. Issue command rootMISS online/src/root/ped.C to see main menu. Or use alias pedme.
   • Click on the crate number, then on module number, to see new pedestals for the given module.
   • "Next" button proceeds to the next module in a crate.
   • "Update" button updates current module.
   • All modules can be checked automatically using "All" buttons.
   • To cancel operation, click on "Cancel" button.
   • Pictures can be save automatically to GIF or PS files.
   • Use "Exit" button to exit from ROOT.

Good luck!, you will need it...