Abstract
The Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT) includes a Fabry-Perot system that provides spectroscopic imaging over the 8 arcmin diameter science field of view, covering the wavelength range 430-860 nm with spectral resolutions ranging from 300 to10000 in four resolution modes. The higher resolution modes require the simultaneous use of two etalons. We discuss the complications encountered in implementing the dual etalon modes, the mechanical and operational solutions that have been devised, and the first science verification results. We also describe an efficient method for adjusting the parallelism of etalons in situ, and the use of the dual etalon system to determine the transmission of the individual etalons. The new dual etalon system was commissioned in late 2015 and is now producing useful scientific observations.
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