ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:	Fri Apr 4 17:16:10 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>We opened one up and soldered a co-ax cable to one of the +6v power contacts at the output of the filter board.</p> <p>Connecting this to a 'scope we observed a level of +/- 5mv noise with no FEE connected.</p> <p>Connecting one FEE made little difference.</p> <p>Re-connected the FEE to the power supply in the cabinet and wired a co-ax to a spare FEE power plug. </p> <p> </p> <p>Ran the system with two FEEs on the bench top and two in the cabinet. The benchtop FEEs were connected to the NIM bin in the cabinet with copper braid.</p> <p>Using a PB4 in the NIM bin and my test input cards on the FEE mezzanine connector, the following readings were taken using the 'integrate' function in the spectrum browser.</p> <p>Shaping 8us, negative pulse.</p> <p>aida02, ASIC1,&ensp;ch0 Peak width => 16.58 channels ( full 16 bit spectra )</p> <p>aida03, ASIC1,&ensp;ch0 Peak width => 18.48 channels ( full 16 bit spectra )</p> <p>aida04, ASIC1,&ensp;ch0 Peak width => 18.05 channels ( full 16 bit spectra )</p> <p>These could be better but the output of the PB4 was not perfect. I think ASIC 1 Ch0 is normally the worst on the mezzanine.</p> <p>Attachments 1 to 6 are the waveforms and some zoomed in.</p> <p>The co-ax from the power supply was connected to a 'scope and showed a noise level of +/-50mv. </p> <p>Fourier analysis of this noise showed two peaks 109kHz and 218kHz. ( Attachments 7 & 8 )</p></td> </tr> </tbody> </table> </p><p> </p> Encoding: HTML ELCode plain Suppress Email notification

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