National Institute of Standards & Technology
نویسنده
چکیده
This Standard Reference Material (SRM) is a primary transfer standard certified using a national reference spectrophotometer at NIST [1-3]. SRM 2930 is complementary to SRM 930e and SRM 1930, providing levels of transmittance/absorbance that extend the range covered by those SRMs. It is intended for use in the verification of the transmittance and absorbance scales of spectrophotometers in the visible spectral region. SRM 2930 is a set consisting of three individual neutral-density glass filters in separate metal holders and one empty filter holder. The exposed surface of the glass is approximately 29 mm × 8 mm, measuring from a point 1.5 mm above the base of the filter holder (see Figure 1). The filter holders are provided with shutters that protect the glass filters when not in use. Each filter-containing holder bears an identification number for the set and individual filter numbers (.1, .3, or 90), which correspond to the nominal percent transmittance (100 × transmittance) of each filter to one significant figure.
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