AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
AIDA
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Entry time:
Thu Mar 10 16:35:39 2016
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> Version 8 firmware > > Analysing R37_* data files (see https://elog.ph.ed.ac.uk/AIDA/160) > > Usinmg MIDASsort, I generate a spectrum showing the time difference (10ns clock cycles) > between sequential ADC data items. There is an offset of 1000. > > I observe peaks at 1000, 1200, 1400 etc - as expected > > I also observe peaks at +/-10 clock cycles relative to these main peaks - not expected > > I also observe some discrete intermediate peaks - not expected I have investigated this timing using a sort program and R37_0. If I only work with data from one module there is no problem. Peaks in the time difference spectrum are the expected 200 apart. If I then include a second module's ADC data the time difference spectrum starts to look as the one Tom attached but with a fixed 45 ticks offset from the '200' peaks. I conclude the spectra appearance is due to the 500KHz ASIC readout clocks not being synchronized between the different FEE64 modules.
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