VEGAS Testing afternoon of 27 Febuary 2014

Goals:

  • Cap off VEGAS system at different places to try and see what the source of the ripple in modes 1, 2, and 3 is

Procedure:

  • Take a fiducial track with Q band and mode 1, 2, and 3 (5 minutes each??, 10 minutes each??, just one mode?)
    • just do modes 1 and 3?? Does mode 2 do anything different??
  • Connect noise source to input of ADC
  • Take 10 min track
  • Connect noise source to input of vegas analog system (i.e., without the long cable coming from the converter module)
  • Take 10 min track
  • Connect source at input of converter module
  • Take 10 min track.

Note: This order takes us from innermost bits of VEGAS to the telescope.

Logs:

  • TGBT13B_502, Session 37
  • Scan 16 -- RippleQbandmode1 -- full system
  • VEGAS was throwing a lot of errors, so we turned the manager off then on again. fixed it.
  • Scan 17 -- RippleQbandmode2 -- full system
  • Scan 18 -- RippleQbandmode3 -- full system
  • Jason Ray is going to put the noise source on banks A-D just in front of the ADC part of VEGAS
  • Something does look right in scans 16, ifnum-0 data coming in looks like crap. Looks like it was due to a bad roach. Going to redo scan 16 at end.
  • Scan 19 -- LbadAllendVariance
  • Scan 20 -- RippleQbandmode1 -- noise source in front of ADC.
  • Scan 21 -- RippleQbandmode2 -- noise source in front of ADC.
  • Scan 22 -- RippleQbandmode3 -- noise source in front of ADC.
  • Jason disconnected the noise source in front of the ADC.
  • Scan 23 -- RippleQbandmode1 -- full system -- is this a re-do of Scan 16, which was corrupted.
  • Then time was up so we stopped.

Results:

-- AmandaKepley - 2014-02-27
Topic revision: r3 - 2015-01-27, RichardPrestage
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