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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
 
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.
 
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
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
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
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