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% @(#)testc_ccd.hlq 1.1 (ESO-SDAG) 8/4/95 14:11:04
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%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%.COPYRIGHT (c) 1994 European Southern Observatory
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%.KEYWORDS MIDAS, ccd package, charge transfer, ccd testing
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%.PURPOSE On-line help file for the command: TESTC/CCD
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%.VERSION 940722RHW created
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%---------------------------------------------------------------------
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TESTC/CCD 21-Jun-1994 RHW
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TESTC/CCD in_frm [rows] x_pix [colums] y_pix
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Compute the horizontal and vertical charge transfer efficiency.
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Compute the horizontal and vertical charge transfer efficiency.
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TESTC/CCD in_frm [rows] x_pix [colums] y_pix
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in_frm = input flat frame. The frame should have an illumination level
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as high as possible, however with being saturated
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rows = the range in y (rows) to be averaged into a single line and
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to be used for computing the HCTE. Default all rows.
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In case of 0.0 as input the HCTE will not be computed.
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x_pix = in the x direction: first and last pixel of the image
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section on the CCD, and the coordinate for the first bias
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overscan pixel (all in pixel coordinates). No default.
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columns = the range in x (columns) to be averaged into a single line
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and to be used for computing the VCTE. Default all columns.
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In case of 0,0 as input the VCTE will not be computed.
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y_pix = in the y direction: first and last pixel of the image
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section on the CCD, and the coordinate for the first bias
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overscan pixel (all in pixel coordinates). No default.
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For the HCTE the command first averages the rows given as the second
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parameter. From the x_range parameter the number of image pixels, the
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last image pixel and the first bias overscan pixel is obtained and
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computes the HCTE according to the formula:\\
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- bs are the counts above the bias level in the first overscan
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- ic are the count above the bias level in the last image pixel in
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- ni are the number of image pixels in a row.
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The values for the bias offset is extracted from the keyword
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{BIASMEAN}, and in computed by the command TESTB/CCD.\\
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To determine the image section of the CCD and the overscan regions
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one can use the commands READ/IMAGE, PLOT/COLUMN and PLOT/ROW.\\
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Note that the last column of a row is often slightly brighter than the
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rest of the row (because the pixel is slightly larger).\\
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The vertical charge transfer efficiency is computed in a similar way.
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TESTB/CCD, READ/IMAGE, PLOT/COLUMN, PLOT/ROW
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testc/ccd red0804 <,> 1,2067,2068 0,0
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Determine the HCTE from the frame red0804. The command will average
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all rows. The HCTE is computed using pixel 2068 as the first bias
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overscan pixel and pixel 2067 as the last image pixel. There are
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2048 valied image pixels in the x direction. The VCTE is not computed.