AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
DESPEC
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Sat Mar 29 11:24:22 2025
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> Looking at the HV bias in a scope to see if it is the source of noise especially on the p+n side > > Channel 1: HV Core channel 4 > Channel 2: HV Braid Channel 4 > Math: Ch1 - Ch2 > > 100V bias (100 uA leakage current for 1 MOhm) > > No obvious frequency components or large frequency components? > I do not know how this compares to RIKEN or STFC-DL > > Updated to put the right frequency range (misread before) > > Fig 3-4: Normalish looking data > > Fig 5-6: Examples of noise appearing randomly on math line > > Fig 7: 1ms long trace, noise stopped appearing > > Update 26.02.2020 > > Fig 8: Trace with all 4 HV channels off > > Fig 9: Trace with only oscilloscope biased > > Fig 10: Trace with braids unplugged from all 3 FEE64s (only channel 4 connected) > > Things to try: > > Joining clean earth & chassis ground? > > Checking HV jumper? > > Finding 'scope probes and testing NIM socket?
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