ASTM E1421-99(2009),Standard Practice for Describing and Measuring Performance of Fourier Transform Mid-Infrared (FT-MIR) Spectrometers: Level Zero and Level One Tests.
ASTM E1421-99(2009) 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.
ASTM E1421-99(2009) is not directly applicable to Fourier transform infrared (FT-IR) spectrometers equipped with various specialized sampling accessories such as flow cells or reflectance optics, nor to Fourier transform near-infrared (FT-NIR) spectrometers, nor to FT-IR spectrometers run in step scan mode.
8. Level One Tests
8.1 Nature of Test-A series of tests, which uses only the standard matte-finish polystyrene, designed to more com- pletely test the instrument performance. The main purpose of level one tests is to compare performance with previous result obtained on the same instrument. The tests can also be used to compare two instruments of the same model type and, with considerable caution, to roughly compare different models.
8.4 Measutrements—In level one, each test requires its own measurements.For comparisons involving a single instrument or model of instrument, choose any convenient measurement parameters, preferably those which reflect the operating param eters used for measurements of analytical samples. The param eters must always be the same for comparisons. On most instruments, use the stored parameter file for the original measurements as a way to get parameter consistency.
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