2017 Mar 13 TCS3 Engineering (T.Denault, E.Volquardsen )

Goals

TCS3 pointing run. (1nd half of night, Sat 3/13/2017, 6:30pm-12:00pm)


1. Encoder Measurement done during the day on Fri 3/10

Asked DayCrew to clean/inspect gears/encoders/tachometer. I.Namahoe reported
this was done on Tues.

Did encoder measurement. per instruction in TCS Manual 1203.
Encoder measurement saved as  r-170310.dat

HA  ratio average is: 19.9545344  +0.01172070 vs the current HA  value
Dec ratio average is: 19.9259447  -0.00022099 vs the current DEC value

Data and Log can be view at: http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/data/encoders/

Note: HA varation is larger in the last 2 years, vs the past.
      HA has increased slightly, will use new encoder ratios
      Dec if very stable, 
Here is the summary graph from the spreadsheetencoder_graph.png

Will used new encoder ratios for TCS during pointing run: TCS3 v170313

2. How is the tcs servo performance?

tracking looks good, Following error range is HA 0.098, Dec 0.01. Very good.
170313-tcs-tracking.png

3. Benchmark current TCS

humidity at 88%
Starting at 7:05pm
Using current TCS version  v170131.
Pattern: benchmark13

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

EV recorded an HD check start, rather that an FK5 catalog star on one data point.
Done at 8:02pm

4. Pointing Run

Install the NEW TCS version  v170313.

Starting at 7:50 - using GRID w/ 70 stars
Done taking data at 8:45 .. only 1hr 05min

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

Removed 5 stars: line 4, 59, 66, 71, 72. using SLIST, then deleting
  outlier candidates. Got fit of: sky RMS 13.16

Adjusted data file:  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 2017/03/13 pointing run:
  IH       +111.1972  
  ID       -232.0626  
  NP         +2.8654  
  CH        -88.2011  
  ME         +1.0229  
  MA        +24.3780  
  HCES     +135.4469 
  HCEC      -79.8703 
  DCES     -463.6234  
  DCEC     +135.9058  
  FO        +37.5064  
  TF         -0.2809  
  TX        -47.6037  

5. B2 benchmark 

Doing benchmark "b2" with new coefficients
Started at 9:30 ... finished at 9:50
Eric indicated the 2nd benchmark was noticeably better. 

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 

New coefficients look better that the old one. 
   HA  error improved from +/- 60 a/s to +4/-6 as
   DEC slop was about the same, but now more centered at zero.
Will keep the new TCS v170313 with new encoder ratios, and new pointing coefficients.