Detector Characteristics
Currently a Reticon CCD (referred to as CCD-9 or Dewar#9) is the only detector available for the Nickel Spectrograph. Dewar#9 is a 400 x 1200 thinned array with 27 micron pixels. The detector is UV flooded to increase sensitivity and make the response more uniform. Pixel scale is about 2 arcsec/pixel when using the 110mm lens (4 arcsec/pixel for 58mm lens). The field of view is approximately 3.6 x 3.6 arcminutes in direct imaging mode. The orientation in the image display window is North up and East to the right.We recommend using the 110mm lens, no binning, and slow readout speed for all data acquisition.
Readnoise and gain for each binning and readout mode is listed below.| Binning | Readout Speed | Gain (e-/DN) |
Readnoise (e-) | Readout Time (sec) |
Linear to (DN) |
|---|---|---|---|---|---|
| x1 | slow | 0.6 | 8.0 | 11 | 45,000 |
| x1 | fast | 0.6 | 69 | 3 | 45,000 |
| x2 | slow | 0.6 | 5.6 | 3 | 50,000 |
| x2 | fast | Mode not usable, bias level > 25,000 DN. | |||
| x4 | slow | 0.7 | 7.6 | 1 | 50,000 |
| x4 | fast | Mode not usable, bias level > 25,000 DN | |||
| Fast readout mode is not recommended for use. Baseline bias should be about 1000 DN (unless otherwise noted). Measured on telescope by E.Gates Sept 2010. | |||||
Support Astronomers (sa@ucolick.org) Last modified: Tue Jul 17 18:48:51 PDT 2012