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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Acoustics, Ultrasound, Vibration for United Kingdom (.PDF file)
Free-field sensitivity level. Reference measuring hydrophones/ projectors. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.7
Three-transducer spherical wave reciprocity in a laboratory tank, IEC 565:1977
Frequency: 1 kHz to 2 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/01
 
Free-field sensitivity level. Reference measuring hydrophones/ projectors. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.5
Three-transducer spherical wave reciprocity in a laboratory tank; IEC 565:1977
Frequency: 2 kHz to 500 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/01
 
Free-field sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.9
Comparison with reference hydrophone, IEC 565:1977
Frequency: 1 kHz to 2 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/02
 
Free-field sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.7
Comparison with reference hydrophone, IEC 565:1977
Frequency: 2 kHz to 1 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/02
 
Pressure sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.5
Comparison with a calibrated reference microphone
Frequency: 25 Hz to 400 Hz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/03
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 6
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 1 MHz to 8 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 7
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 9 MHz to 12 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 8
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 13 MHz to 16 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 11
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 17 MHz to 20 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Ultrasonic power. Plane piston ultrasound transducer and generator, 0.0005 W to 1 W
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2.5 to 6
Primary standard radiation force balance
Frequency: 0.8 MHz to 20 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/08/05
 
Ultrasonic power. Plane piston ultrasound transducer and generator, 0.50 W to 20 W
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 3.5 to 5
Calibrated radiation force balance
Frequency: 0.8 MHz to 3 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/08/05
 
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, 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