2011 Apr 28 TCS3 Engineering (Denault, Golisch )

Goals

TCS3 pointing run. (1nd half of night, 7pm-11:30pm)

1. Encoder Measurement done during the day.

DayCrew Clean/inspect gears/encoder on Apr27 (yesterday).

goto zenith
ape.set.pmac
MP with 1600, after 2 point changed to 1200 as/s.

Forgot to record HA/DEC Ape-vs-encoder error (do it next time).
  HA_hrs  Err_HA_DEC(as)

  DEC_deg Err_HA_DEC(as)
 
Save data as: r-110428.dat
Data and Log can be view at: http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/data/encoders/

Modify TCS3 with new encoder rations.


2. benchmark1 
use current tcs version v100712 (old ratios, old map).

Check telescope setup:
   spex in the middle.
   chopper is on and centered.
   apes.set.pmac to zero encoders.

filename is b1.dat
pattern benchmark 13
start tracking & initialize pointing

Tony recording pmac following error range to check servo tracking performance:
b1_star    ferr_range   StdDev
  1        0.269        0.050
  2        0.340        0.077
  3        0.355        0.060
  4        0.285        0.048
  5        0.372        0.066  needed to reslew
  6        0.363        0.066
  7        0.362        0.071
  8        0.344        0.062  Dome is in the way at 19:11 ..20:10 (1hour lost).
  9        0.275        0.048
 10        0.299        0.050
 11        0.441        0.071
 12        0.456        0.079
 13        0.268        0.053

Resulting benchmark data files:
   tpoint file:  b1.dat
   .ape   file:  b1.ape

3. Take Pointing Data

Switch to new TCS v110428. to used new encoder ratios.

Starting at: 8:31am

Goto Zenith, stop and Ape.Set.PMAC
filename: pointing.dat
Pattern: Grid
Sep: 14 (give 60 starts).

Bill finished taking data at 9:30 (about 1 hours)
At zenith ape - encoder is: -42.1 17.2

tpoint file:  pointing.dat
.ape   file:  pointing.ape

Used tpoint to get new coefficients:

tpoint_log.dat  - log of tpoint session.
pointing.ps  
pointing.pdf - tpoint graphs (postscript and PDF)
pointing_coeff.txt - resulting coefficients.

Sky RMS = 17.18

Updated .tcs-init with new coefficients
die, and restarted TCS to read new .tcs-init file.

4. benchmark2

Check telescope setup:
   apes.set.pmac to zero encoders.

filename is b2.dat
pattern benchmark 13
start tracking & initialize pointing

   tpoint file:  b2.dat
   .ape   file:  b2.ape

Finished b2 at 10:14pm.

5. b1 vs b2

Look at the 2 benchmarks

   Here is a graph of HA error of b1.dat vs b2.dat
   
   gnuplot to make the graphs:
       plot   'b1.ape' using 10 with linespoints  title 'b1 HA pt.madj'
       replot 'b2.ape' using 10 with linespoints  title 'b2 HA pt.madj'

   Here is a graph of DEC error of b1.dat vs b2.dat
   
   gnuplot to make the graphs:
      plot   'b1.ape' using 11 with linespoints  title 'b1 Dec pt.madj'
      replot 'b2.ape' using 11 with linespoints  title 'b2 Dec pt.madj'

   HA  is  worse  (b1 std=16.1,  b2 std=21.1)
   Dec is  better (b1 std=21.9,  b2 std=18.5).
   Pointmap performance should be about the same.

Will keep the new pointing coefficients.


6. Follow up

TCS Servo Tracking getting worse: no sample under 250. (some should be below 0.150)
Follow up with EW; need to see if we can improve performace of TCS.

Bill reporting the pointing button are slower at extreme north. Cos(dec) issue?

About 5 hrs would be good for a pointing run. The number of star could be 
expanded from 60 to 70.