ASTM E1421-99(2009) pdf free download.Standard Practice for Describing and Measuring Performance of Fourier Transform Mid-Infrared (FT-MIR) Spectrometers: Level Zero and Level One Tests.
This practice describes two levels of tests to measure the performance of laboratory Fourier transform mid-infrared (FT-MIR) spectrometers equipped with a standard sample holder used for transmission measurements.
Referenced Documents
ASTM E131 Terminology Relating to Molecular Spectroscopy;
ASTM E1866 Guide for Establishing Spectrophotometer Performance Tests;
ASTM E1944 Practice for Describing and Measuring Performance of Laboratory Fourier Transform Near-Infrared (FT-NIR) Spectrometers: Level Zero and Level One Tests;
ASTM E932 Practice for Describing and Measuring Performance of Dispersive Infrared Spectrometers;
Reference Spectra—Two spectra acquired and stored following the last major instrument maintenance are used as eferences. Major maintenance could include changes in source, laser, detector, or optical alignment. These spectra will be identified as Reference 1 and Reference 2.
Reference Spectrum I is a single-beam energy spectrum of an empty beam. (In this and all later usage, empty means that nothing is in the sample path except air or he purge gas normally present within the spectrometer sampl ompartment).If possible, the interferogram corresponding to Reference Spectrum I should also be saved.
7. Level Zero Test Procedures
7.I Energy Spectrum Test-Overlay Spectrum I and Refer- ence I. Note any change in energy level across the spectrum Ratio Spectrum I to Reference Spectrum I to produce a transmittance spectrum, and look for significant changes from
10 %o, especially at high wavenumber. Video display resolution may limit the accuracy to which this test can be interpreted if the comparison is made on-screen.