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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
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
 
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