2019 Apr 09 -  TCS3 Engineering (T.Denault, G.Engh  )

Goals
TCS3 pointing run. (1st half of night, Tue 04/09/2019, 6:50pm-12:30am)
Last one was done on 2017-12-06.

1. Encoder Measurement

Asked DayCrew to clean/inspect gears/encoders/tachometer. Done per Daycrew.
East current were high - some confusion the which balance is the 'best', Daycrew indicates "test04-02-19".
Did encoder measurement. will used the new ratios: 19.9469514337 19.9272320392
encoder measure data stored here:  data/encoders/

2. How is the tcs servo performance?

Tracking is OK. Following error range is HA 0.186, Dec 0.021. HA has funny oscillation.
190409-tcs-tracking.png
(But later on tracking got better, following error between 0.109 to 0.128.

3. Benchmark current TCS

Started at 7:05pm
Using current TCS version  v190220.
Pattern: benchmark13

NOTED - motors fighting durig slew:
   190409-tcs-slewing-bad1.png  - bad slew, motor push, and braking.
   190410-tcs-slewing-normal.png - this is a good slew.
   190409-tcs-slewing-bad2.png - another bad slew.

tpoint file:  b1.dat
.ape   file:  b1.ape

Done at 7:30pm

4. Pointing Run

Change TCS to new version v190409 (with new encoder ratios).

Starting at 8:00 - using GRID w/ 70 stars
Done taking data at 9:05 .. 1hr 05min

In general, tracking (following error) looks good.

tpoint file:  point.dat
.ape   file:  point.ape

used all data, RMS =  178.33
Removed #1,    RMS =  18.99
Removed #69,   RMS =  18.36
Removed #6,    RMS =  17.28
Removed #12,   RMS =  16.74

Adjusted data file is:  point-adj.dat


tpoint.log - log of fit using point-adj.dat
point.ps
point.pdf - tpoint graphs (postscript and PDF)
point_coeff.txt - resulting coefficients.

Updated .tcs-init with new coefficients
# coefficients from 2019/04/09 pointing run:
 IH        +67.4612 
 ID       -164.5890 
 NP         +7.1159 
 CH        -77.7909 
 ME        +25.4250 
 MA        +33.3327 
 HCES     +143.8543 
 HCEC      -29.0235 
 DCES     -414.3360 
 DCEC     +123.5879 
 FO         +5.2252 
 TF       -154.8597 
 TX        +36.8867

5. B2 benchmark 

Doing benchmark "b2" with new coefficients
Started at 10:00... finished at 9:22

Now, let's compare 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'
   
6. Conclusion 

Point run when well. Many, if not all, were in the FOV from slew to slew.

New coefficients are almost equal, or just slighty better that the old one. 
   HA  has a slight improvement in the graph.
   DEC was about the same. 
Will keep the new TCS v190409 pointing coefficients.

Finished at 22:30