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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
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
 
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.
 
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
 
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 %: 0.1
Double grating monochromator
Wavelength: 405 nm to 919 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: 920 nm to 1000 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: 1001 nm to 1400 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 to 0.4 (depending on wavelength)
Double grating monochromator
Wavelength: 1401 nm to 1800 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Approved on 20 April 2017
 
Responsivity, spectral, irradiance. Broad band detector. Measurand unit, A/(W m-2), V/(W m-2), reading/(W m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 3.2
Double grating monochromator
Wavelength: 200 nm to 210 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Other types of detector can also be calibrated
Approved on 20 April 2017
 
Responsivity, spectral, irradiance. Broad band detector. Measurand unit, A/(W m-2), V/(W m-2), reading/(W m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1
Double grating monochromator and reference detectors
Wavelength: 211 nm to 239 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Other types of detector can also be calibrated
Approved on 20 April 2017
 
Responsivity, spectral, irradiance. Broad band detector. Measurand unit, A/(W m-2), V/(W m-2), reading/(W m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.7 at 240 nm, 0.5 above 240 nm
Double grating monochromator and reference detectors
Wavelength: 240 nm to 315 nm
Bandwidth: < 10 nm
Power level: < 20 µW
Other types of detector can also be calibrated
Approved on 20 April 2017