ON-LINE CALORIMETER CALIBRATION

IN SITU WAVEFORME ANALYSIS: ECS

Test Setup:  

• Waveform Scanner ("Carte de Gisele"): schema, altera-code, resistors
• No Preamps in PreampBoxes
• All Pulsers with PowerSupplies
• Trigger from HP generator: signal NIM (-0.8V), width >600ms, repetition >200ms

Data:

• Measurements for pulser 4-7, DAC=30k: amplitude, rise time at 10%, peak-time, integrale, fall time at 10%
• Measurements on test-bench: linearity, stablity, preamp. slots

Results:

• Uniformity on ECS at DAC=30k: Uniformity with Backplane correction
  better than 1% on amplitude, backplane corrections important on amplitude, rise and fall time

Method Verification with Orsay Test Set-up:

• Stability: 12 measurements on the same postition:
  variations below 0.5%
• Linearity: input variation from 0V-2V in steps of 200mV, scope gain unchanged:
  saturation at 2V, linearity better than 1%
• Oscilloscope Gain: input at 600mV, scope gain variation from 0.2V/unit to 1V/unit:
  variations up to 2.5% on amplitude, integral less affected, no change in shape except for very low gain
• Origin of 8-fold pattern: input at 600mV, measurement in 4 consecutive slots:
  variations on integral w.r to switch/backplane and not to channel number

 

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