4. COMMON PROCEDURES


4.1 ISS LOOP PROCEDURES

    4.1.1 Explanation of ISS Loop
          ISS reads in limb of sun and automatically centers the instrument 
	    (active optics)
          it is a feedback loop and it works when the loop is closed and 
	    doesn't work when open

    4.1.2 Procedure
          Open the ISS (Image Stabilization System) loop before doing 
            anything that could go out of the normal range of the instrument 
            because if the loop is closed and the ranges are exceeded damage 
            could be done
          To open the loop, 
	  To close the loop,


4.2 LIMB FIGURES

    4.2.1 Explanation
          Take limb annulus and read pixels that are only inclusive of the 
            limb. The set of pixels changes from position changes in the
            spacecraft.
          Take limb figures (pixel readings) often to help with data 
            comparisons.

    4.2.2 Procedure  
          on the EGSE Command Console, type set_limb_04		
          type in the value


4.3 NULLING ISS ERROR SIGNALS
    
    To null the ISS error signals: perf alignit_v15


4.4 JITTER TEST

    4.4.1 Explanation

    4.4.2 Procedure
	  stop structure via q_stop_seq_v03
	  open ISS loop	- openloop_v01
	  open d on SAS
	  q_start_iss_v01
	  DO MOMENTUM MANAGEMENT
	  q_stop_iss_v01
	  open d on SAS
	  run q_runstr_v14	(allow > 10 mins)
	  leave ISS loop open until AFTER trim burn (~00:00-00:15)
	  close ISS loop during NRT at ~02:05
	  maybe need to null error signals via alignit_v15 ??


4.5 LEG ALIGNMENTS

    4.5.1 Explanation

    4.5.2 Recommended Operation of the Alignment Mechanism (Larry Springer)

	  MDI Team
	  Jake has asked me to send a note out on the operation of the 
	  Alignment mechanism. Therefore, this is how I beleive the Alignment
	  Mechanism should be operated.

	  BASELINE POWER SWITCHING
	  The Alignment Mechanism should be turned on at the start of a days 
	  amignment activities. At the end of the days activity it should be 
	  returned to sun center and turned off. Normally the old legcenter 
	  (run to limit and step back N steps) should never be done. If center
	  of range if needed use Pots to center. (AM1 ~-53; AM2~-42)

	  TURN ON
	  Reset both of the controllers (MBAM1RS, MBAM2RS) prior to turning on
	  the Alignment Mechanism Drive Power. Remember the controllers are 
	  powered with the applications electronics power the Alignechanism 
	  Power On powers only the motor driver.  After turning on the 
	  Alignment Mechanism watch both pots and the mechanism current for 
	  signs of movement. If  movement is seen turn off the Alignment 
	  Mechanism because there is a problem. (Caution the pot readouts are 
	  noisy)

	  TURN OFF
	  After the days alignment mechanism activities are completed, return 
	  to the sun center position (When a sun center position is picked the
  	  corresponding pot readings should be noted and considered the new 
	  AM center position.) prior to turning the Alignment Mechanism Drive 
	  Power (MBPWAMOFF).

 
    4.5.3 Procedure (Instance Form)
	  ^000181:
          Action:         image_recenter
          Status:         Open
          Date_submitted: 23-May-96
          SOI_Proposal:   
          Objective:      To recenter the MDI image for the Dynamics Period
          IAP_sci_obj:    
          Requestor:      Rock Bush <rock@quake.stanford.edu> 
          Duration:       1 hour
          Requirements:   NRT-s; MDI-H VC2; Loop Open; 
          Campaign:       cam_fd_cont
          ALT_Cadence:    
          Preferred_Time: 
          Started: 
          Completed: 
 
          Script: 
                perf q_seq_options_v03
                set chain address to cam_fd_cont (addr=304)
                
                perf openloop_v01
                
                perf alignit_v15
                  do full alignment including leg motion
                  after completing PZT offset adjustment
                  renull ISS error signals and lock loop
          Notes: 
                current image center is determined by the IDL program 
	        CURVEFIT.  Example numbers are,
                      511.313      512.104      483.903
                
                Need to recenter image for the Dynamics run
                over the next two months

 	        Rock Bush uses the IDL routine monitor_center to determine
		what the image center numbers should be


4.6 STARTING & STOPPING STRUCTURE
    
    To stop the sequence: perform q_stop_seq_v03

    To start the sequence: perform q_runstr_v17 (most recent version as of 
      May 30,1996)


4.7 RUNNING CAMPAIGNS

    1. Hit "START" on EGSE Command Selection display page to be enabled for 
        commanding

    2. Highlight "PROCS" and select q_seq_options_v03, which brings up the 
        campaign sequence options menu

    3. From the instance, get the campaign name (under campaign:)

    4. On a shell window, type whatscam <campaign name> and use the number it 
        shows as the address of the campaign in #6 

    5. Select "Set Cam Addr"

    6. Type in the address of the campaign (the number from #4)

    7. Turn on the Campaign Flag to start the campaign by selecting the 
        "Set Cam Flag" button

    8. Look at the duration on the instance

    9. After the duration is over, stop the campaign by selecting the 
        "Clear Cam Flag" button

    10.If you are done commanding, hit the "STOP" button on the EGSE Command 
        Selection display page


4.8 TROUBLE SHOOTING