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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 2.7E-05 to 1.6E-03, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 200 nm to 209 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 4E-05 to 6E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 210 nm to 219 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 3E-05 to 4E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 220 nm to 249 nm
Bandwidth: < 3 nm
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003 to 0.001, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: regular reflectometer
Regular reflectance measurements
Approved on 07 May 2007
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.04 to 0.004, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: hemispherical reflectometer
 
BRDF. General material, 0.0008 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
BRDF. General material, 0.0003 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Reflectance factor. General material, 0.25 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Reflectance factor. General material, 0.1 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Radiance factor. General material, 0.25 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Radiance factor. General material, 0.1 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Wavelength. Spectrally-selective transmitting material, 200 nm to 2500 nm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 0.1
Scanning spectrophotometer
Wavelength range: 200 nm to 2500 nm
Bandwidth: 0.1 nm to 5 nm
Approved on 07 May 2007
 
Wavenumber. Spectrally-selective transmitting material, 1028 cm-1 to 3060 cm-1
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm-1: 0.2 to 0.3 (depending on wavenumber)
Scanning spectrophotometer
Wavenumber values: 3060 cm-1, 2850 cm-1, 1943 cm-1, 1601 cm-1, 1583 cm-1, 1154 cm-1, 1028 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Approved on 07 May 2007
 
Correlated colour temperature. Tungsten lamp, 2000 K to 3200 K
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in K: 10
Reference lamps and spectroradiometer
Other types of source can also be calibrated at higher uncertainty levels (uncertainty depends on the spectral characteristics of the source) Approved on 20 April 2017
 
Correlated colour temperature response. Colour temperature meter. Measurand unit, reading/K
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in K: 10
Tungsten reference lamps
Correlated colour temperature: 2000 K to 3200 K
Calibrations can also be carried out at correlated colour temperatures used for visual displays e.g. 6500 K (uncertainty associated such calibrations is higher and depends on the source used) Approved on 20 April 2017
 
Colour, emitted, x, y. General source, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0008 to 0.0001, varies with measurand
Spectroradiometer and reference lamps
Bandwidth: < 20 nm
Type of source: any source, including displays
The uncertainty varies according to the source properties; the quoted uncertainty applies for tungsten sources. Results can also be expressed in other units e.g. u, v or Lab
 
Colour, emitted, u, v. General source. u, v, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004
Spectroradiometer and reference lamps
Bandwidth: < 20 nm
Type of source: any source, including displays
Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab.
Approved on 07 May 2007
 
Colour, emitted, u, v. General source. u, v, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0001
Spectroradiometer and reference lamps
Bandwidth: selected to suit source type
Type of source: any source, including displays
Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab.
Approved on 07 May 2007
 
Colour, emitted, u-prime, v-prime. General source, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004
Spectroradiometer and reference lamps
Bandwidth: < 20 nm
Type of source: any source, including displays
Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab.
Approved on 07 May 2007
 
Colour, emitted, u-prime, v-prime. General source, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0001
Spectroradiometer and reference lamps
Bandwidth: selected to suit source type
Type of source: any source, including displays
Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab.
Approved on 07 May 2007