HOWTO Change ASM skip-frame position safety thresholds

;  [0] no focal station selected
;[1,2...7] thresholds for the corresponding focal station
;[3] LBTI

lowth_cmd            array    
    float 8
    0  36e-6 36e-6 36e-6 36e-6 36e-6 36e-6 36e-6
end

deltath_cmd          array
    float 8
    10e-6 10e-6 10e-6 10e-6 10e-6 10e-6 10e-6 10e-6
end

upth_cmd             array
    float 8
    120e-6 120e-6 120e-6 73e-6 120e-6 120e-6 120e-6 120e-6
end

lowth_force          array
    float 8
    -0.77 -0.77 -0.77 -0.77 -0.77 -0.77 -0.77 0.77
end

upth_force           array
    float 8
    0.77 0.77 0.77 0.77 0.77 0.77 0.77 0.77
end

deltath_mode          array
    float 8
    260e-6 260e-6 260e-6 260e-6 260e-6 260e-6 260e-6 260e-6
end

upth_mode           array
    float 8
    130e-6 130e-6 130e-6 130e-6 130e-6 130e-6 130e-6 130e-6
end

• lowth_cmd: minimum position command
• deltath_cmd: maximum delta position command
• upth_cmd: maximum position command
• lowth_force: negative force command threshold
• upth_force: positive force command threshold
• deltath_mode: maximum delta reconstruction mode allowed
• upth_mode: maximum integrated mode allowed

• set the shell as usual and load the selected shape, if needed
• in the adsecsx or adsecdx workstation, call "adsceng" script and open and IDL Terminal
• write the command print, set_safe_skip(ACTLIST=adsec.act_w_cl, MINCMD=mincmd_in_meters, MAXCMD=maxcmd_in_meters ). The standard parameters are restored with the command: print, set_safe_skip(ACTLIST=adsec.act_w_cl, MODLIST=indgen(n_elements(adsec.act_w_cl)))

• before set max and min skip-frame position command thresholds, check the max and min distance read by the system in the AdSecMirror GUI
• to notice some change, you should set the MINCMD at least around 40e-6 (40e-6 or 45e-6 can be a good value, depending on mirror shape and on the amount of tilt you want to allow before skipping frames). The blind zone value change for each actuator but is usually less than 40e-6 [m].

Comments