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

Tektronik 2Kx 2K, frontside 21 µm pixels, science grade

2 x 2K x 4K Marconi (E2V) CCDs, backside15 µm pixels, science grade

Outputs

2 amplifiers (left and right)

4 amplifiers (A,B, C, D)

Read noise
[e-/rms]

Left	Right
6.1	6.3

A	B	C	D
3.9	4.2	3.6	3.6

Conversion Factor
[e-/ADU]

Left	Right
1.98	2.17

A	B	C	D
1.55	1.56	1.63	1.70

Plate scale

0.211"/pix

0.135"/pix

Bias level

~ 750-800 ADU

~1000 ADU

Saturation

65535 ADU

Linearity

Left amp: 1% linear till 60,000 ADUs
Right amp: 1% linear till 60,000 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

4x51=204 real pre image area pixels,
4x80=320 electronically added post image area pixels

Erase time [sec]

Readout time [sec]

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 North BLUE North GUIDER

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.