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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
 
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