The SR5000 spectroradiometer addresses a wide variety of military, industrial and scientific applications that demand real-time, noncontact, highly accurate and highly sensitive measurements of object’s radiometric properties. It covers the waveband from 0.207~14.5m, has spectral resolution as fine as 2% and records over 30 spectra per second. In this paper, we describe the testing process and present results of the SR5000 spectroradiometer performance, for InSb/MCT/CVF8 infrared waveband (1.3~14.5m). We present testing data of the FOV flatness and symmetry, the spectral resolution and accuracy, the effective temperature and the noise equivalent temperature difference.