The LRIS red and blue detectors characteristics are shown in the table below. The detectors used in the two guiders are described in the Guiders CCDs page

  Red Side Blue side
Type  LBNL 2k x 4k CCDs frontside 15 µm pixels, science grade 2 x 2K x 4K Marconi (E2V) CCDs, backside 15 µm pixels, science grade
Outputs 4 amplifiers (1,2,3,4) 4 amplifiers (A,B,C,D)
Read noise
[e-/rms]
1 (1-12L) 2 (1-12R) 3 (1-13L) 4 (1-13R
4.67 3.79 2.97 3.10
A B C D
3.9 4.2 3.6 3.6
Conversion Factor
[e-/ADU]
1 (1-12L) 2 (1-12R) 3 (1-13L) 4 (1-13R
1.022±0.005 0.955±0.005 0.877±0.006 0.916±0.005
A B C D
1.55 1.56 1.63 1.70
Plate scale 0.135"/pix 0.135"/pix
Bias level ~ 1000 ADU ~1000 ADU
Saturation 65535 ADU 65535 ADU
Linearity 50,000 ADUs The average blue side is 1% linear till 53,000 ADUs and 1.5% linear till saturation.

CTE @ 40,000 e-
CTE @ 200 e-		  
A B C D
0.9999997 0.9999997 0.9999997 0.9999997
0.9999992 0.9999997 >0.999999 >0.999999
Prepix/Postpix 4x12=48 real pre image area pixels
4x80=320 electronically added post image area pixels		 4x51=204 real pre image area pixels,
4x80=320 electronically added post image area pixels
Erase time [sec] 10 8
Readout time [sec]
Binning Time (s)
1x1 94
1x2 55
2x1 60
2x2 39
42
Orientation in space

Click on the image to enlarge
Orientation vs keywords

When the rotator mode is set to "Position Angle" mode the ROTPOSN keyword may be used to determine the image rotation. ROTPOSN is defined as the rotator user position.

ROTPOSN RED NorthBLUE NorthGUIDER
0 90 right 180 down 0 up
90 180 down 270 left 90 right
180 270 left 0 up 180 down
270 0 up 90 right 270 left
Orientation on images with ROTPOSN set to 270

Click on the image to enlarge
Windowing/Binning Binning and windowing available Binning along dispersion possible (Y direction). Binning in X not possible. No windowing.