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S2KB CCD Information
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Technical Specifications
Date: 4/10/97
CCD NAME : S2KB
CCD SN : 1383BR03-01
PIXEL SIZE : 21x21 microns
PIXEL SCALE : 0.60 arcsec/pixel
CHIP SIZE : 2048 x 2048
DIGITAL LIMITATION : 65,534
BIAS LEVEL : ~750 (gain=#3)
MICROCODE : "Harcon1009"
PREFLASH, e- : none
NOISE, e-/RMS : 14 9 8 7
GAIN, e-/ADU : 7.5 5.0 3.0 2.0 1.0
GAIN, DETPARS#: 1 2 3 4 5
LINEARITY,0.1%,e-: ~210,000
LINEARITY,1.0%,e-: ~230,000
COLUMN SPILLOVER, e- : ~240,000
INTERNAL RADIATION EVENT RATE, EVENTS/HR : ~2700
CONTROL TEMP. deg C (thermocouple) : ~-107
COMPUTER TEMP. deg C (ccdinfo) : ~-109
DARK CURRENT, e-/hr/pix : ~5-10
DEAD COLUMNS :
HOT COLUMNS : [1571:1571,1134:2048] bias
: [2066:2066,1:2048] in overscan region, see comment below
LOW COLUMNS : [1103:1103,744:2048] flat field
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The quantum efficiency
of S2KB is given in this figure. The abscissa is wavelength in nanometers and
the ordinate is dQE (%).
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Here are examples
of the original calibration frames for S2KB. Click on the link to display the
(BIG) image.
There is a hot column in the overscan region, [2066:2066,1:2048].
Check for the presence and position of this column in your data. You
will probably NOT want to use the default BIASSEC in CCDPROC, but rather
set BIASSEC to [2053:2064,1:2048] or a similar region of your choosing.
More recently,
S2KB has developed an enhanced bias level in one corner amounting to a peak
of ~1500 ADU above an overall level of ~965 ADU. Here
is a bias exposure which shows this effect. The enhancement is limited to the region X < ~240 pix and Y> ~1800 pix.
You can estimate
exposure times for S2KB using the CCDTIME package in IRAF v2.11.3 which should
still have the necessary information in its ccdtime$kpno.dat database file.
If it does not, here is the kpno.dat file.
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