ELOG AIDA

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 Sep 18 11:18:46 2014
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<p>The SY1527 supply was delivered with three modules.</p> <p>A cable has been made with LEMO00 connectors to connect to the detector adaptor HV inputs.</p> <p>The SY1527 needed an external VGA display and ps2 keyboard. The software appears to be windows 98 based and won't boot until the bios is told to ignore drive D.</p> <p>On boot the Drive A must be skipped. I will provide training when others wish to use the system <img src="https://elog.ph.ed.ac.uk/fckeditor/editor/images/smiley/msn/teeth_smile.gif" alt="" /></p> <p>Channel 0 is being used and has been tested with a voltmeter to provide the correct voltage at the LEMO00 connections. The control seems to be reliable and trips with over current.</p> <p>200 volts has been applied to the detector with a final current of 3.9uA. The ramp up/down rate is 1V/second.</p> <p>The acquisition system was run with  pulser OFF and reference setting of 0x30 on the two negative modules nnaida11 and 12.</p> <p>The rates were 130K/sec + on both the 11 and 12.</p> <p>Run down the HV and add a 'scope probe ( 10MR and 11pF ) .</p> <p>Run up and the 'scope shows 20mv pk-pk mushy noise with occasional 200mV+ bursts.</p> <p>The acquisition performance did not improve.</p> <p>Changed the reference on 11 and 12 to 0x90 and switch on the pulser then the rate became 20K to 25K. Stat spectra show that ASIC3 and 4 on these boards are still more active than 1 & 2.</p> <p>Changed the reference on 11 down to 0x40 and Stat spectrum shows ASIC 3 and 4 become more active.</p> <p>Added an R/C filter at the HV iput to the adaptor board. Removed the 'scope probe. The filter is the same as used with the HV supply in a box block from PorgamRays.</p> <p>No real improvement.</p> <p>Changed 11  & 12 reference back to 0x90.</p> <p>Waveforms in 12 seem normal.</p> <p>Back to working on the VHDL changes now.</p> <p> </p> <p> </p> <p> </p> Encoding: HTML ELCode plain Suppress Email notification Resubmit as new entry

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