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= Chopper Open Loop Measurements =
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 * chopper has to be disabled
 * start PacketRecorder
 * start script '''SPEC_Chopper_OpenLoop_MoveAbs_OBS.tcl''' the parameters '''chop_max_ma'''(maximum current in mA), '''chop_step_ma'''(current step width in mA) and '''chop_damptime'''(plateau duration in sec)
 * close PacketRecorder

H. Dannerbauer; 07-Dec-2006

Index TableOfContents(2)


1. Determination of Chopper Offset


  • Chopper has to be switched-off and controller disabled
  • start PacketRecorder

  • start diag. HK with SPEC_Chopper_dhk_imt_OBS using Generic_CUS_script.tcl

  • determine chopper offset (chop_offset) from DM_CHOP_CUR_POS
  • include the new chopper offset in chopper control parameter set
  • stop diag. HK with SPEC_Chopper_dhk_stop_OBS using Generic_CUS_script.tcl

  • close PacketRecorder

  • switch-on chopper
  • load up chopper control parameters including the new offset
    • -> tcl-script CONF_chopper_OBS.tcl with parameter fileU and calUcol

  • enable chopper controller in order to upload new control parameter set
    • -> EnDis_chopper_OBS.tcl and parameter onoff ON


2. Chopper Open Loop Measurements


  • chopper has to be disabled
  • start PacketRecorder

  • start script SPEC_Chopper_OpenLoop_MoveAbs_OBS.tcl the parameters chop_max_ma(maximum current in mA), chop_step_ma(current step width in mA) and chop_damptime(plateau duration in sec)

  • close PacketRecorder


3. Verify function of Ge:Ga detectors, CREs and detector heaters PTD 0.7.3 (TBD!)


  • for detailed test description see PTD_0.7.3 (->file attachment:vergega.pdf) or in CVS

  • prerequisites:
    • PACS in spectroscopic mode
    • blue detector heater should be around 2.1 K
  • short test description:
    • procedures consists of two tests, one in loss-less compression mode to get raw ramps and one in default mode
    • start with test in loss-less compression mode; detector selection table with 14 randomly selected pixel DXS7602 in both channels; execute CUS script SPEC_detector_fmilt073_detsel_llc_OBS.cus (called by tcl-script Generic_CUS_OBS.tcl); script lasts 1659 seconds

    • do then test in default mode; therefore, execute CUS script SPEC_detector_fmilt073_standard_OBS.cus (called by tcl-script Generic_CUS_OBS.tcl); script lasts 134


4. Chopper Synchronization PTD 0.7.6 (TBD!)


4.1. Spectroscopic Mode (TBD!)

  • for detailed test description see PTD_0.7.6_spec (->file attachment:chopsynspec.pdf) or in CVS

  • prerequisites:
    • PACS in spectroscopic mode
    • setup Chopper Configuration Parameter for 8 degree; use from CAL-U table CONFChopper the column FM_sa2_81deg

  • short test description:
    • we use the SPU mode loss less compression
    • detector selection table with 14 randomly selected pixel DXS7602 in both channels

    • use CUS script SPEC_Chopper_fmilt076spec_detsel_llc_OBS.cus for conducting this test (called by tcl-script Generic_CUS_OBS.tcl); script lasts 865 seconds

4.2. Photometeric Mode (TBD!)

  • for detailed test description see PTD_0.7.6_phot (->file attachment:chopsynphot.pdf) or in CVS

  • prerequisites:
    • PACS in photometric mode
    • setup Chopper Configuration Parameter for 8 degree; use from CAL-U table CONFChopper the column FM_sa2_81deg; to do this do following:

      • if chopper controller enabled, disable chopper controller with CUS script XXX (called by tcl-script XXX with parameters XXX)

      • do chopper configuration with CUS script XXX (called by tcl-script XXX with parameters XXX)

      • enable chopper controller with CUS script XXX (called by tcl-scritp XXX with parameters XXX)

  • short test description:
    • we use the SPU mode loss less compression
    • detector selection table with 14 randomly selected pixel DXS7602 in both channels

    • use CUS script PHOT_Chopper_fmilt076phot_detsel_llc_OBS.cus for conducting this test (called by tcl-script Generic_CUS_OBS.tcl); script lasts 51 seconds

Herschel: PACS/FM_ILT_Procedures/MPIAprocedures (last edited 2009-07-15 14:32:36 by localhost)