next up previous contents index
Next: SET ANGLE Up: SET Previous: SET   Contents   Index


SET AMPLITUDE

        CLIC\SET AMPLITUDE [ABSOLUTE|RELATIVE] [SCALED|UNSCALED]
        [KELVIN|JANSKY] [ANTENNA|BASELINE]

    This command controls which scaling factor is applied to  the  data  for
    plotting  and  writing in the output table, in subsequent PLOT and TABLE
    commands:

      - ABSOLUTE means that the relative amplitude calibration  is  not  ap-
        plied.

      -  RELATIVE  means  that the relative amplitude calibration, as deter-
        mined with SOLVE AMPLITUDE, and stored with STORE AMPLITUDE, is  ap-
        plied.

      -  SCALED  means  that the absolute amplitude is divided by the source
        flux; SCALED is only used for the command SOLVE AMPLITUDE.

      - KELVIN|JANSKY indicates the unit in which  the  amplitude  are  dis-
        played: either Kelvins (in main-beam brightness temperature) or Jan-
        skys.

    SET AMPLITUDE ABSOLUTE forces SET AMPLITUDE KELVIN since the uncalibrat-
    ed data are measured in Kelvins. With SET AMPLITUDE RELATIVE, the ampli-
    tudes are in Janskys, since a calibrator of known flux has been used for
    reference.  If  the default is overridden (SET AMPLITUDE ABSOLUTE JANSKY
    or SET AMPLITUDE RELATIVE KELVIN), conversion  factors  (=antenna  effi-
    ciencies)  are  taken from the scan headers; these factors may be deter-
    mined by SOLVE FLUX and stored by STORE FLUX.

    SET AMPLITUDE ANTENNA|BASELINE switches between Antenna-based and  Base-
    line-based amplitude calibrations.  This switch will be active for SOLVE
    AMPLITUDE (calibration curve determination), STORE  AMPLITUDE  (calibra-
    tion curve storing operation), and SET AMPLITUDE RELATIVE (application).
    Both baseline-based and antenna-based calibration curves may  be  stored
    alongside in the data header, independently of each other. Using SET AM-
    PLITUDE ANTENNA is recommended.


Gildas manager 2018-02-17