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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.
 
Responsivity. Fibre optic power meter. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Comparison with reference detector
Wavelength: 850 nm
Bandwidth: < 1 nm
 
Responsivity. Fibre optic power meter. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Comparison with reference detector
Wavelength: 1300 nm
Bandwidth: < 1 nm
 
Responsivity. Fibre optic power meter. Measurand unit, A/W, V/W, reading/W, W, dB, dBm
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Comparison with reference detector
Wavelengths: 1480 nm to 1570 nm
Bandwidth: < 1 nm
 
Time scale difference. Local clock vs UTC, -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, -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