CRM 400

Neutral-Density Glass Photometric Standards

  • nine (9) NDG filters – available as single filters or sets
  • transmittance span – nominal 0.1 %T to 90 %T
  • absorbance span – nominal 0.04 to 3
  • spectral range 440 nm to 635 nm
  • certification at five (5) standard NIST test wavelengths [440.0 nm, 465.0 nm, 546.1 nm, 590.0 nm, 635.0 nm]
  • calibration expiration two (2) years

Primary Application

  • routine validation of photometric (transmittance and absorbance) scales of UV/VIS spectrophotometers
  • regulatory compliance – USP analytical spectrophotometer qualification

Certificate of Calibration

  • 30 photometric reference values and expanded uncertainties
    • [15 transmittance density format
    • [15 transmittance format]
  • calibration measurement conditions
  • instructional guidelines for use

– Product Set 4000930

  • equivalent to NIST SRM 930 series
  • three (3) NDG filters (nominal 10%T , 20%T and 30%T) (nominal 1.0 AU, 0.7 AU, 0.5 AU)
  • traceable to NIST SRM 930 series

– Product Set 4001930

  • equivalent to NIST SRM 930 series
  • three (3) NDG filters (nominal 1%T , 3%T and 50%T) (nominal 2.0 AU, 1.5 AU, 0.3 AU)
  • traceable to NIST SRM 1930 series

– Product Set 4002930

  • equivalent to NIST SRM 2930 series
  • three (3) neutral-density glass filters (nominal 0.1%T , 0.3%T and 90%T) (nominal 3.0 AU, 2.5 AU, 0.04 AU)
  • traceable to NIST SRM 2930 series