TGBT14A_912_48 - back to back VEGAS / Spectrometer tests

Goals

  • Run Jim Braatz KFPA observing scripts with Spectrometer and VEGAS - continued

Details

  • Start at 8:00am
  • Copy AGBT14B_342 eso558_acs and eso558_vegas to TGBT14A_912
  • Run them back to back - four iterations of the NOD cycle
  • Scan 1 - VEGAS is being written into the wrong directory - Aborts
  • eso558_vegas.
  • Scan 2 - 9
[13:12:26] Balancing VEGAS
[13:12:37] ERROR: Balance command has failed
[13:12:37] the following attenuators need further adjustment
[13:12:37] ConverterRack CMAttenuator1
[13:13:02] ERROR: Balance command has failed
[13:13:02] the following attenuators need further adjustment
[13:13:02] VEGAS,BankFMgr lbw_gain,1
[13:13:02] VEGAS,BankCMgr lbw_gain,1
[13:13:02] VEGAS,BankBMgr lbw_gain,1
[13:13:02] VEGAS,BankHMgr lbw_gain,1
[13:13:02] VEGAS,BankEMgr lbw_gain,1
[13:13:02] VEGAS,BankGMgr lbw_gain,1
[13:13:02] VEGAS,BankAMgr lbw_gain,1

  • Bank A pol 1 is at -24Dbm. Just continue for now.
  • run eso558_acs
  • Get the following error (also for VEGAS):
[13:23:39] Warning: Configuration complete but inconsistencies were found between the M&C system and the configuration tool. Verify the configuration 
[13:23:39] (manager,    parameter,   expected value,  actual value )
[13:23:39] ('LO1', 'S10', '2', '1')

  • Also, IF power level for port 1 is off optimal level by 3.16dB (presumably same channel as for VEGAS). Continue
  • Scans 10 - 17

  • Switch to one nod pair per SB, and continue to switch between _vegas and _acs.
  • When VEGAS is running, continually get the lbw_gain error message.
  • For a typical sampler (BankB, pol1, J3) from VEGASDM:
    • input Sampler = -18dBm, FWHM ~ 50
    • filtersnap - 26dBm, FWHM ~ 20
    • filtersnap_nogain - 32dBm, FWHM = 0
  • Maybe we are seeing quantization noise?? Unlikely - just a few bits toggling should be enough
  • As expected, CM1 Attenuator is pegged at 0dB

-- RichardPrestage - 2014-11-25
Topic revision: r2 - 2015-01-27, RichardPrestage
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