TGBT14A_912_12 - Bank H Balance Tests / Sawtooth problem tests

Goals

  • Remove attenuator from output of VEGAS IF module in Bank H
  • Check for the "sawtooth" problem

Details

  • Run an SB which failed balanced before - RRLMode11TP_nodata - configures all Banks, but doesn't take data
  • All balance ok, apart from Bank H adcpwr2 (J16) - sits at -38dB
  • Jason takes a 15dB pad out from the ADC end of Bank H, J16. Now at -24dB. Try balancing again.
  • No change. Jason takes out 10dB pad from the other end of the cable.
  • Can now balance ok.

  • Run RRLMode3TP, Mode4TP, Mode10TP in succession, looking for "sawtooth" data.
  • Starts at scan 1... already have the problem.
  • Abort Scan 2, conform parameters
  • Scan 3 Mode3TP - still there (from data display)
  • Turn Manager Off and On...
  • Scan 4 Mode3TP - still there
  • Go home for lunch and come back again. Check it is still there...
  • Scan 5 Mode3TP - still there
  • Try switching to Mode 4 TP
  • Scan 6/7 Mode 4 - looks fine
  • Back to Mode 3
  • Scan 8 - problem is there still
  • Restart Bank A only - see if the problem is still there.
  • Scan 9 Mode 3 still there
  • Ray restarts the bank A Roach
  • Scan 10 Mode 3 still there.
  • Try Mode3_different
  • Scan 11 - still there (NB this is cross, so need to look at plnum 2 and 3).
  • Ray puts in a different HPC program
  • Scan 12 Mode3_different - still screwed up.
  • Ray tries a different BOF File (from April)
  • Scan 13 Mode3_different with Bank A only
  • Ray switches back to original BOF file
  • Scan 14 - problem is still there.
  • Ray power-cycles the Roach
  • Scan 15 - bad again
  • Ray tries the old BOF again
  • Scan 16 - looks good!!!!
  • Revert to config files from 18th July
  • Scan 17 - looks good! - using the new BOF (July 15 version)
  • Ray keeps trying things most (all?) of scans 18-26, with different combinations, look bad.
  • Ray puts everything back to normal (latest version)
  • Scan 27 - still bad.
  • Pack in for the day....
Topic revision: r4 - 2015-01-27, RichardPrestage
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