CIRSI TCS parameter change to define ROT SKY 0

On the 1/6/98 we found with ROT SKY 167 the orientation of the reference
chip was as it should be with ROT SKY 0. Here the instruction how to tweak
the TCS parameters to establish this orientation as ROT SKY 0:

- login on LPVB as TCS_LOGIN
- select GSEXAM
- exa mec_ar_dat(4).limit
  exa enc_ad_zeropt(4)		/* to display the actual values */

  with this default values the PF rotator limits are -85.51 and 271.48
  (type USER> SHOW LIMITS) and
  mec_ar_dat(4).limit.pos_plus = 4.7383
  mec_ar_dat(4).limit.pos_minus = -1.4925
  enc_ad_zeropt(4) = 4.7656

- now change the values by -2.914699 (-167 degree), type
  dep mec_ar_dat(4).limit.pos_plus = 4.7383 - 2.914699
  dep mec_ar_dat(4).limit.pos_minus = -1.4925 - 2.914699
  dep enc_ad_zeropt(4) = 4.7656 - 2.914699

- it is important now to zeroset the PF rotator incremental encoder, type
  USER> ZERO ROT ABS

  with this new values the PF rotator limits are -252.51 and 104.48
  (type USER> SHOW LIMITS)

you may now iconize the GSEXAM session


5/6/98	Juerg Rey

CIRSI INSTRUCTIONS   06/07/99
=============================
TCS:
 STATION PRIME
 INSTRUMENT OWN
 ROT SKY 0
 TELESCOPE FOCUS 87.40mm

ENTER AP OFFSET FOR CIRSI
  ENTER AP 1  320  320 
  ENTER AP 2  320 -320
  ENTER AP 3 -320  320
  ENTER AP 4 -320 -320 
  ENTER AP 5  400  400
  ENTER AP 6  400 -400
  ENTER AP 7 -400  400
  ENTER AP 8 -400 -400

CIRSI TEAM DO DITHERING MODE FROM SCRIPS IN ICL.