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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Time and Frequency for United Kingdom (.PDF file)
Time scale difference. Local clock vs UTC(NPL), -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 2
Direct comparison against UTC(NPL)
Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Time scale difference. Local clock vs UTC, -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 40
Comparison against predicted UTC
Prediction time: 20 days
Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Time scale difference. Local clock vs UTC, -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 10
Comparison against post-processed UTC
Post-processed. Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Time scale difference. Remote clock vs UTC(NPL), -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 20
GPS common view comparison against UTC(NPL)
Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT04
 
Time scale difference. Remote clock vs UTC, -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 40
GPS common view comparison against predicted UTC
Prediction time: 20 days
Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT04
 
Time scale difference. Remote clock vs UTC(NPL), -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 20
Comparison against UTC(NPL) using transfer standard
Specified range and uncertainty apply to sub 1 s difference measurements. Time scale differences greater than 1 s can also be measured.
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Frequency. Local frequency standard, 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 5E-14
Phase time measurement against UTC(NPL)
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Frequency. Local frequency standard, 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 5E-14
Phase time measurement against UTC(NPL)
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Frequency. Remote frequency standard , 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E-13
Common view of GPS signals
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT04
 
Frequency. Remote frequency standard , 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E-13
Common view of GPS signals
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT04
 
Frequency. Remote frequency standard , 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E-13
Phase time measurement against transfer standard
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Frequency. Remote frequency standard , 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E-13
Phase time measurement against transfer standard
Averaging time: 1 day
Approved on 21 April 2005
Internal NMI service identifier: NPL/TT02
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 2.7E-05 to 1.6E-03, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 200 nm to 209 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 4E-05 to 6E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 210 nm to 219 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 3E-05 to 4E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 220 nm to 249 nm
Bandwidth: < 3 nm
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003 to 0.001, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: regular reflectometer
Regular reflectance measurements
Approved on 07 May 2007
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.04 to 0.004, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: hemispherical reflectometer
 
BRDF. General material, 0.0008 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
BRDF. General material, 0.0003 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Reflectance factor. General material, 0.25 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007