This standard specifies the basic terms commonly used in analytical instruments, as well as electrochemical analytical instruments, optical analytical instruments, thermal analytical instruments, mass spectrometers, spectral instruments, chromatographic instruments, energy spectrum and ray analytical instruments, physical property analytical instruments, other analytical instruments and Terms and definitions for its auxiliary devices. This standard applies to analytical instruments. The words in square brackets [] in this standard are words that can be omitted without causing confusion; the words in parentheses () are synonyms for the former unless otherwise specified.