TGBT14A_912_11 - VEGASDM jump tests

Goals

• Try and isolate cause of VEGAS DM jumps, and Bank H balancing problems

Details

• Try mode 11, this failed to balance VEGAS before. Take out data acquisition step.
• Fails to balance. Steve investigates CM16 is dead - this explains the problem.

• NB - don't seem to get drop-outs when scan is not running...
• Run RRLMode10SP - this should show drop-outs. Run an archivist sampler on Bank A - can't find any!
• Scan 1 RRLMode10SP - spike is present in both sampler and VEVGASDM. So, it is not a VEGASDM problem.
• Try running with Bank A looking at the noise source
• Scan 2 RRLMode10SP - Bank A noise source - still see -ve going spikes
• Try and get an archivist running - edit RRLMode10SP _Archivist
• Scan 3 - Bank A now looking at astronomical signal again. Still get a spike. Is it present in the data?
• Try and run mode 1 with highest possible data rate, and see whether we still get spikes.
• With Doppler Tracking turned on; can only go as fast at 0.2 secs; try this.
• Scan 4 RRLMode1SP _archivist - still shows drop-outs.
• Turn off Doppler tracking, and put integration time to 0.1 secs. Add archivists on all Banks
• Scan 5 RRLMode1SP _archivist (all 8 banks). No drop-outs. Must be related to Doppler tracking?
• Turn Doppler tracking back on again; 0.2 sec integration times
• Scan 6 RRLMode1SP _archivist - dropouts (Bank B, Bank A, Bank D, Bank B, Bank C).
• Go back to the noise source in all banks
• Scan 7 RRLMode1SP _archivist - dropouts (Bank G - one pol, again, Bank F +ve, Bank D, Bank F)
• Scan 8 RRLMode1SP _archivist - dropouts (Bank E, Bank D)
• Switch back to Mode 10 where we seemed to get more dropouts.
• tp_nocal, 0.1s integrations
• Scan 9 - RRLMode1SP _archivist by mistake
• Scan 10 - RRLMode10SP _archivist - aborts
• Scan 10 - aborts again - why? - continue the scan - seems ok? - LO1? No data is taken, but no dropouts.
• Scan 10 RRLMode10SP archivist in _TP mode_ aborts again - what is going on here? LO1 is screwed up
• Scan 10 RRLMode10SP archivist in _TP mode_ (with cal)
• Turn Doppler tracking back on again; 0.2 sec integration times - Mode 1
• Scan 11-13 RRLMode1SP _archivist External Noise source in both Pols of Bank A (five iterations)
• Drop-outs Bank F, C, B, G, E, D, H - seems quite convincing. Switch to Mode 10, which has more dropouts
• Scan 14-15 RRLMode10Sp_archivist - Dropouts B,C,D,E,F,G,H - no A
• I'm convinced. Stop here