2011 Aug 09 TCS3 Engineering (Denault, Volquardsen )

Goals

TCS3 pointing run. (1nd half of night, 7pm-12:00pm)

1. Encoder Measurement done during the day.

Asked DayCrew Clean/inspect gears/encoder/tachometer in the morning.
 + HA Tac was worn out, Day Crew replaced it.
 + Unable to inspect Dec bull gear, cover plate to heavy for today's manpower limited daycrew.
 + See Koenig email: : gk-email.txt

Recording DEC Ape-vs-encoder error:

  HA_hrs  Err_HA_DEC(as)
    0       0      0
   -1      -8.5    0.6
   -2      -6.8   -2.3
   -4      12.8  -16.4
    0     -10.9    0.3
    1       1.4   -2.3
    2      16.4   -7.7
    4      43.2  -24.4
    0     -10.2   -0.7

  DEC_deg Err_HA_DEC(as)
    20     -10.3  -0.6
     5     -10.5  -4.5
   -10     -10.5   2.8
   -40     -10.3  21.5
    20     -10.3   2.7
    35     -10.4  16.0
    50     -10.5  19.2
    60     -10.5  20.0
    20     -10.6   7.2
 

Save data as: r-110809.dat
Data and Log can be view at: http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/data/encoders/

(Opps, don't need to take APE Error Manually - it is done by the encoder utility).

Using OLD ratios for TCS.

2. benchmark1 

Ask operator input the onaxis guider video into the polycom.

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        0.300        0.056
  2        0.395        0.064
  3        0.350        0.066
  4        0.311        0.061
  5        0.391        0.070  
  6        0.411        0.070
  7        0.468        0.078
  8        0.318        0.049 
  9        0.280        0.065
 10        0.339        0.084
 11        0.426        0.080
 12        0.370        0.067
 13        0.370        0.069

Here is a screen shot of Details-Graph1:110809.png 

Will add this screen shot this pages showing various tracking screen from 2009/05
0905/noisy_tachometer/ 

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

3. Take Pointing Data

Starting at: 8:00am

Goto Zenith, stop and Ape.Set.PMAC, Peak up pointing.
filename: pointing.dat
Pattern: Grid
Sep: 13 (gives 70 starts).

EricV finished taking data at 9:00 (about 1 hours)
At zenith ape - encoder is: -25. 5.8  

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 = 15.84

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

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'

New coefficients look 'just as good' as the old one.
Will keep the new pointing coefficients.


6. Follow up

Servo performance in terms of following error is getting worse.

Only need 5 hours for tcs3 pointing runs.