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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
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
 
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
 
Temperature. Cell for contact thermometry, 83.8058 K
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in K: 0.00025
Triple point of Argon for capsule SPRT
Approved on 18 May 2004
Internal NMI service identifier: NPL/PK01
 
Temperature. Cell for contact thermometry, 156.5985 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0007
Freezing point of Indium
Approved on 18 May 2004
Internal NMI service identifier: NPL/PK01
 
Temperature. Cell for contact thermometry, 231.928 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0006
Freezing point of Tin
Approved on 18 May 2004
Internal NMI service identifier: NPL/PK01
 
Temperature. Cell for contact thermometry, 419.527 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0009
Freezing point of Zinc
Approved on 18 May 2004
Internal NMI service identifier: NPL/PK01
 
Temperature. Long-stem SPRT, 156.5985 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0007
Calibration at Indium freezing point
Approved on 18 May 2004
Internal NMI service identifier: NPL/PM02
 
Temperature. Long-stem SPRT, 231.928 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0007
Calibration at Tin freezing point
Approved on 18 May 2004
Internal NMI service identifier: NPL/PM02
 
Temperature. Long-stem SPRT, 419.527 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0009
Calibration at Zinc freezing point
Approved on 18 May 2004
Internal NMI service identifier: NPL/PM02
 
Temperature. Long-stem SPRT, 660.323 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.0025
Calibration at Aluminium freezing point
Approved on 18 May 2004
Internal NMI service identifier: NPL/PM02
 
Temperature. Long-stem SPRT, 961.78 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.004
Calibration at Silver freezing point
Approved on 18 May 2004
Internal NMI service identifier: NPL/PM02
 
Humidity. Dew-point hygrometer, -45 °C to 75 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.033 to 0.05
Calibration using a humidity generator
Approved on 03 November 2009
Internal NMI service identifier: NPL/MH01
 
Temperature. Platinum Resistance Thermometer, -100 °C to -80 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.01
Calibration by comparison
Bath: acetone
Approved on 03 November 2009
Internal NMI service identifier: NPL/PM04
 
Temperature. Noble-metal thermocouple (type R, S), 419.527 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.13
Calibration at fixed point
Approved on 03 November 2009
Internal NMI service identifier: NPL/PM03
 
Temperature. Noble-metal thermocouple (type R, S), 961.78 °C
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in °C: 0.21
Calibration at fixed point
Approved on 03 November 2009
Internal NMI service identifier: NPL/PM03