The chip normally assigned to the RC Spectrograph is T2KB. This is one of the best chips at the Observatory with ~4 electrons rms readout noise, over 200,000 electrons full-well and excellent quantum efficiency. The default gain setting is 3.2electrons/ADU (gain index:4). This is the gain setting for which the chip has been adjusted for minimum horizonal streaking (7/1995). The radiation event rate for this chip is very significant and results in a maximun practical exposure time of about one hour. It is recommended to take two or three short exposures to properly discriminate against these cosmic-ray events.
CCD SN : 1428BR03-01 DATE: 3/9/95
PIXEL SIZE : 24u x 24u
CHIP SIZE : 2048 x 2048
DIGITAL LIMITATION : 32,767
BIAS LEVEL : ~600
MICROCODE : T2KB (CHE-13)
PREFLASH, e- : none
AMPLIFIER : AMPLIFIER : D
NOISE, e-/RMS : NOISE, e-/RMS : 4.0
GAIN, e-/ADU : GAIN, e-/ADU : 10.7,8.2,5.4,3.2,2.0,1.1
GAIN, DETPARS# : GAIN, DETPARS# : 1 2 3 4 5 6
LINEARITY,0.1%,e-: LINEARITY,0.1%,e-: ~220,000
LINEARITY,1.0%,e-: LINEARITY,1.0%,e-: ~250,000
RADIATION EVENT RATE, EVENTS/HR : 3000 !!
CONTROL TEMP. deg C (thermocouple) : -165.7, -95.9
COMPUTER TEMP. deg C (ccdinfo) :
DARK CURRENT, e-/hr/pix : <4 (non-MPP)
NOTES : Slight background above bias ~2.2e-.
: Excellent CTE.
DQE 900nm, % 33.1
DQE 800nm, % 60.3
DQE 700nm, % 79.9
DQE 600nm, % 81.8
DQE 500nm, % 76.5
DQE 405nm, % 64.9
DQE 365nm, % 49.8
DQE 320nm, % 16.0