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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