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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
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
 
Illuminance responsivity, tungsten source. Illuminance meter. Measurand unit, A/lx, V/lx, reading/lx
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5 to 0.4, varies with illuminance
Photometric bench and reference lamps / photometer
Illuminance: 0.1 lx to 8 lx
Colour temperature: 2856 K
Approved on 20 April 2017
 
Illuminance responsivity, tungsten source. Illuminance meter. Measurand unit, A/lx, V/lx, reading/lx
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.4
Photometric bench and reference lamps / photometer
Illuminance: 8 lx to 500 lx
Colour temperature: 2856 K
Approved on 20 April 2017
 
Illuminance responsivity, tungsten source. Illuminance meter. Measurand unit, A/lx, V/lx, reading/lx
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.4 to 1.0, varies with illuminance
Photometric bench and reference lamps / photometer
Illuminance: 500 lx to 50000 lx
Colour temperature: 2856 K
Approved on 20 April 2017
 
Luminous flux. Tungsten lamp, 1 lm to 100 lm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.7 to 0.6, varies with measurand
Integrating sphere or goniophotometer
Colour temperature: 2000 K to 3200 K
 
Luminous flux. Tungsten lamp, 100 lm to 20000 lm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.6
Integrating sphere or goniophotometer
Colour temperature: 2000 K to 3200 K
 
Illuminance. Tungsten lamp, 0.1 lx to 50000 lx
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5
Photometric bench and reference lamps / photometer
Correlated colour temperature: 2000 K to 3200 K
 
Luminance. Tungsten-based source, 1 cd/m2 to 20000 cd/m2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Telephotometer and reference lamp / calibrated diffuser combination
Correlated colour temperature: 2700 K to 3200 K
 
Luminance responsivity. Luminance meter. Measurand unit, A/(cd m-2), V/(cd m-2), reading/(cd m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.5
Reference lamp / diffuser combination
Luminance: 1E-04 cd/m2 to 1 cd/m2
Type of source used: tungsten reference lamp / diffuser combination
 
Luminance responsivity. Luminance meter. Measurand unit, A/(cd m-2), V/(cd m-2), reading/(cd m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Reference lamp / diffuser combination
Luminance: 1 cd/m2 to 20000 cd/m2
Type of source used: tungsten reference lamp / diffuser combination
Other types of source can also be used
 
Responsivity, spectral, power. Broadband detector. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 3.6 to 3.2, depending on wavelength
Double grating monochromator
Wavelength: 200 nm to 210 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Approved on 20 April 2017
 
Responsivity, spectral, power. Broadband detector. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Double grating monochromator
Wavelength: 211 nm to 239 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Approved on 20 April 2017
 
Responsivity, spectral, power. Broadband detector. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.7 at 240 nm, 0.5 above 240 nm
Double grating monochromator
Wavelength: 240 nm to 315 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Approved on 20 April 2017
 
Responsivity, spectral, power. Broadband detector. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.3
Double grating monochromator
Wavelength: 316 nm to 404 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Approved on 20 April 2017