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The Double Beam Spectrograph at the 2.3m telescope

README: Known problems and things of which you should be aware

Introduction / Instrument Overview

Instrument capabilities and hardware details

Observing

Setup & configuring the DBS ready for observing

Observing Reports

Trouble shooting

Fault Reports

Copying your data to tape

Data reduction

Online resources. Local and Links

• Grating angle calculator
• DBS Exposure calculator
• DBS Arc atlas
• The CICADA CCD user interface
• Useful data for Spectrophotometry (Bessell)
• Spectrophotometric standard stars (ESO)

Acknowledgements

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Detailed Table of Contents

Introduction

Instrument capabilities and hardware details

Detectors

Gratings
Dichroics
Long slit (spectral resolution)
Spatial resolution
Filters

Neutral Density

System throughput (not yet available)
Slit masks (Multi-object observing)
F/1·5 focal Reducer

Observing

Getting going quickly

A brief overview of the required observing procedures.
Instrument changes
Starting up the telescope.
Pointing your target
Observing procedures

Taking exposures / The CCD controllers
DBS Hardware control

Starting the DBS control computer
The decker
Setting the slit width
Changing filters
Selecting arc lamps

Autoguider
Taking calibration data

Bias frames
Arc lamps for wavelength calibration
Taking flat fields
Telescope control for DBS observers

Dome lights
Telescope pointing calibration
Rotator selection and control
Rotator handset control
The telescope CONFIGURE command
The telescope SWITCH command

End of night procedures

Setup. Configuring the DBS ready for observing

Changing Gratings
Changing Dichroics
Setting the Central Wavelength
Collimator Focus
filter
Filling the dewars

Observing reports

Trouble shooting

Fault reports

Copying your data to tape

Data reduction

Online resources. Local and links

Site information
SSO weather
Spectrophotometric standard stars
Stars for correcting atmospheric absorption
extinction data (Not yet implemented)
slit transmission - Diego (Not yet implemented)
differential refraction curves (Not yet implemented)
Almanac data - sunrise, sunset, hourly airmass tables, seasonal observability, etc.

Acknowledgements

Many thanks to those who contributed to this documentation:
The Teldocs Consortium, Tim Axelrod, Saskia Besier, Mike Bessell, Michelle Buxton, Paul Francis, Ken Freeman, Lisa Germany, David Hoadley, Helen Johnston, Stefan Keller, Lisa Kewley, Joe Liske, Sean Ryan, Elaine Sadler, Raylee Stathakis, Wilfred Walsh.