Varian SpectrAA 220G Graphite Furnace Atomic Absorption Spectrometer. PC-controlled double beam AA spectrometer. The SpectrAA 110/220 optics feature four lamp positions with automated wavelength and slit selection, and high intensity deuterium background correction as standard. Lamps are mounted in fixed positions, and a rotating mirror is used to select the operating lamp, eliminating the need for a conventional turret. For maximum stability in an automated sequence, a software controlled next-lamp warm up facility is provided.