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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Colour, surface, x, y, Y. General material, Y = 0 to Y = 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Fluorescent material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference spectrofluorimeter
Type of source used: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Fluorescent material, Y = 0 to Y = 300
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference spectrofluorimeter
Type of source used: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Diffusely reflecting material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Diffusely reflecting material, Y = 0 to Y = 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, surface, L*a*b*. General material, L* = 0 to L* = 100
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.15
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007
 
Colour, surface, L*a*b*. General material, a*, b* = -200 to a*, b* = 200
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.1
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007
 
Colour, surface, L*a*b*. Fluorescent material, L* = 0 to L* = 160
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference spectrofluorimeter
Irradiation conditions: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, L*a*b*. Fluorescent material, a*, b* = -200 to a*, b* = 200
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 1.2
Reference spectrofluorimeter
Irradiation conditions: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, L*a*b*. Diffusely reflecting material, L* = 0 to L* = 100
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.15
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, surface, L*a*b*. Diffusely reflecting material, a*, b* = -200 to a*, b* = 200
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.1
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, transmitted, x, y, Y. General material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002
Spectrophotometer
Specific measurement conditions: regular transmittance geometry
Type of material: non-fluorescent
 
Colour, transmitted, x, y, Y. General material, Y = 0 to Y = 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Spectrophotometer
Specific measurement conditions: regular transmittance geometry
Type of material: non-fluorescent
 
Colour, transmitted, L*a*b*. General material, L* = 0 to L* = 100
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.05
Spectrophotometer
Specific measurement conditions: regular transmittance geometry
Type of material: non-fluorescent
 
Colour, transmitted, L*a*b*. General material, a*, b* = -200 to a*, b* = 200
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.05
Spectrophotometer
Specific measurement conditions: regular transmittance geometry
Type of material: non-fluorescent
 
Wavelength. Fibre optic source, 800 nm to 1700 nm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 0.3
Spectrum analyser
 
Wavelength. Optical spectrum analyser, 600 nm to 1700 nm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in pm: 34
Lamp / wavemeter / transition locked laser
Measurements can be made at specified wavelengths within this range, depending on the availability of a suitable laser source. The uncertainty will depend on the properties of the OSA under calibration.
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 3E-05 to 3.5E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 250 nm to 749 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 1E-05 to 4.5E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 750 nm to 2500 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0017 at 0.73
Scanning spectrophotometer
Wavenumber: 3990 cm-1
Bandwidth: 2 cm-1 to 15 cm-1
Specific measurement conditions: measured at 5 ° and f/6. Values calculated for normal incidence and a range of f/n's.
Other types of material can also be calibrated. Uncertainties at other transmittance values available on request.
Approved on 07 May 2007