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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
 
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
 
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.