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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Absorbance, regular, spectral. Spectrally-neutral material, 0.22 to 0.5
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0003
Reference spectrophotometer
Wavelength range: 220 nm to 249 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.22 to 0.5
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0001 to 0.0002
Reference spectrophotometer
Wavelength range: 250 nm to 749 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.22 to 0.5
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002 to 0.0004
Reference spectrophotometer
Wavelength range: 750 nm to 2500 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.5 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0010 to 0.0017
Reference spectrophotometer
Wavelength range: 200 nm to 209 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.5 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004 to 0.0009
Reference spectrophotometer
Wavelength range: 210 nm to 219 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.5 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0003 to 0.0006
Reference spectrophotometer
Wavelength range: 220 nm to 249 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.5 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002 to 0.0005
Reference spectrophotometer
Wavelength range: 250 nm to 749 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 0.5 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004 to 0.0013
Reference spectrophotometer
Wavelength range: 750 nm to 2500 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 1 to 2
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0017 to 0.0117
Reference spectrophotometer
Wavelength range: 200 nm to 209 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 1 to 2
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0009 to 0.0026
Reference spectrophotometer
Wavelength range: 210 nm to 219 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 1 to 2
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0006 to 0.0022
Reference spectrophotometer
Wavelength range: 220 nm to 249 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 1 to 2
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0005 to 0.0022
Reference spectrophotometer
Wavelength range: 250 nm to 749 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Absorbance, regular, spectral. Spectrally-neutral material, 1 to 2
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0013 to 0.0043
Reference spectrophotometer
Wavelength range: 750 nm to 2500 nm
Bandwidth: < 4 nm
Specific measurement conditions: CIE geometries
Other types of material can also be calibrated
Approved on 07 May 2007
 
Reflectance, diffuse, spectral. Spectrally-neutral material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference reflectometer
Wavelength range: 350 nm to 1000 nm
Bandwidth: < 20 nm
Specific measurement conditions: spatial integration
Other types of material can also be calibrated
Approved on 20 April 2017
 
Reflectance, regular, spectral. Spectrally-neutral material, 0.003 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.002 to 0.003, depending on wavelength and reflectance
Reference reflectometer
Wavelength range: 320 nm to 1600 nm
Bandwidth: < 20 nm
Specific measurement conditions: as required
Other types of material can also be calibrated
Approved on 20 April 2017
 
Reflectance, regular, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.001 to 0.003
Spectrophotometer with V-only reflectometer
Wavenumber range or wavelength range: 4000 cm-1 to 180 cm-1 or 2.5 µm to 56 µm
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: 10 °
Approved on 07 May 2007
 
Reflectance, regular, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0003 to 0.006 (depending on polarisation and angle)
Spectrophotometer with variable angle reflectometer
Wavenumber range or wavelength range: 4000 cm-1 to 180 cm-1 or 2.5 µm to 56 µm
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: 10 ° to 85 °
Approved on 07 May 2007
 
Reflectance, hemispherical, spectral. Spectrally-neutral material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 4E-03 to 3.8E-04, varies with wavenumber
Spectrophotometer with hemispherical reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: hemispherical reflectometer
Other types of material can also be calibrated
 
Luminous intensity. Tungsten lamp, 1 cd to 10000 cd
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5 to 0.4, varies with colour temperature
Photometric bench and reference lamps / photometer
Colour temperature: 2000 K to 2856 K
 
Luminous intensity. Tungsten lamp, 1 cd to 10000 cd
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.4 to 0.5, varies with colour temperature
Photometric bench and reference lamps / photometer
Colour temperature: 2856 K to 3200 K