This paper describes a unique, state-of-the-art spectral calibration system. SAM2 (Spectral Analysis Microcomputer) automatically calibrates the optical responsivity of detectors and light measuring instruments from 220 nm to 1800 nm. Three pages of data and plot are automatically printed out at the end of each measurement cycle. SAM2 does both radiometric and photometric calibrations and analysis. Self prompting measurement programs, stored in PROM memory, are initiated via simple commands entered on the associated teleprinter.