UV-Visible spectrophotometer calibration filter sets are designed as secondary spectrophotometer calibration standards for ultraviolet and visible wavelengths.
The set consists of three metallic-coated neutral-density filters, a holmium oxide filter, a blank filter holder, and a hardwood case. The filters are mounted in a cuvette-sized holder made of a non-metallic material to protect filters from damage.
Nominal neutral density filter transmittance values are 10%, 30%, and 80%. Each filter is individually calibrated for transmittance at 250.0 nm, 280.0 nm, 340.0 nm, 360.0 nm, 400.0 nm, 465.0 nm, 500.0 nm, 546.1 nm, and 635.0 nm.
Spectrophotometer calibration filters are primarily used to calibrate various transmittance values and are derived from the National Institute of Standards and Technology (SRM 2031, 2034, etc.). Uncertainty of the transmittance values is ±1.0%. The calibration will not vary more than ±1.0% over a period of one year.
The holmium oxide filter has distinctive transmittance valleys between 279.3 nm and 637.5 nm. This filter is especially useful for wavelength calibration of spectrophotometers.
Each component of this set may be purchased individually.