VEGAS Testing afternoon of 27 Febuary 2014
Cap off VEGAS system at different places to try and see what the source of the ripple in modes 1, 2, and 3 is
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.
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.
This topic: CICADA
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