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The BIPM key comparison database
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METROLOGY AREA
Ionizing Radiation (135)
Amount of Substance (105)
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Mass (70)
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Acoustics, Ultrasound, and Vibration (14)
TYPE
Key comparisons (415)
Supplementary comparisons (86)
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Approved for equivalence (255)
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ORGANISATIONS
EURAMET (formerly EUROMET) (131)
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Result of the search
Your query 'United Kingdom' produced 501 results New search
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  CCPR- K5.2019 Spectral diffuse reflectance
2019 - 2020
Comparison type, Field   Key comparison in Photometry and Radiometry, Properties of materials
Parameter(s)   A parallel beam with a spectral bandwidth of 5 nm centred on the wavelengths of 360 nm, 380 nm, 400 nm, 420 nm, 440 nm, 480 nm, 530 nm, 580 nm, 630 nm, 680 nm, 730 nm, 780 nm, and 830 nm is used.
Status   Protocol complete
  CCRI(II)- K2.Pa- 231 Activity measurement of Pa-231 in aqueous solution
2017
Comparison type, Field   Key comparison in Ionizing Radiation, Section II (Measurement of Radionuclides)
Parameter(s)   Separation date defined as 2017-05-22 at 09:55 UTC; DDEP decay data.
Status   Report in progress, Draft B
  EURAMET.T- K8 Comparison in high dew-point temperatures
2008 - 2012
Comparison type, Field   Key comparison in Thermometry, Humidity
Status   Report in progress, Draft A
  CCPR- K1.a.2017 Spectral irradiance
2017 - 2018
Comparison type, Field   Key comparison in Photometry and Radiometry, Radiometry
Parameter(s)   Wavelength range: 250 nm to 2500 nm
Status   Protocol complete
  CCQM- K1.b Carbon dioxide (CO2) in Nitrogen (N2)
1993 - 1994
Comparison type, Field   Key comparison in Amount of Substance, Gases
Status   Approved for equivalence, Results available
  CCEM- K4 Comparison of capacitors
1996 - 1998
Comparison type, Field   Key comparison in Electricity and Magnetism, Capacitance
Capacitance, 10 pF
Parameter(s)   Frequency: 1592 Hz
Status   Approved for equivalence, Results available
  CCQM- K3 Automotive emission gases
1998 - 1999
Comparison type, Field   Key comparison in Amount of Substance, Gases
Status   Approved for equivalence, Results available
  BIPM.EM- K10.a DC voltage, Josephson standards
1991-
Comparison type, Field   Key comparison in Electricity and Magnetism, DC Voltage and Current
DC voltage: 1.018 V
Status   Ongoing, approved for equivalence, Results available
  BIPM.EM- K10.b DC voltage, Josephson standards
1994 -
Comparison type, Field   Key comparison in Electricity and Magnetism, DC Voltage and Current
DC voltage: 10 V
Status   Ongoing, approved for equivalence, Results available
  CCEM- K6.a Comparison of AC/DC voltage transfer standards
1993 - 1999
Comparison type, Field   Key comparison in Electricity and Magnetism, AC Voltage, Current, Power, and AC/DC Transfer
Parameter(s)   Voltage: 3 V
Frequency: 1 kHz, 20 kHz, 100 kHz and 1 MHz
Status   Approved for equivalence, Results available
  CCEM- K2 Comparison of resistance standards
1996 - 2000
Comparison type, Field   Key comparison in Electricity and Magnetism, Resistance
Resistance: 10 megaohms and 1 gigaohm
Parameter(s)   Voltage: 10 V, 50 V, 91 V or 100 V
Status   Approved for equivalence, Results available
  CCEM- K5 AC power at 50/60 Hz
1996 - 2000
Comparison type, Field   Key comparison in Electricity and Magnetism, AC Voltage, Current, Power, and AC/DC Transfer
Parameter(s)   Power factor: 1.0, 0.5 Lead, 0.5 Lag, 0.0 Lead, 0.0 Lag
Status   Approved for equivalence, Results available
  EUROMET.RI(II)- K2.Sc- 47 Activity of radionuclide Sc-47
1983
Comparison type, Field   Key comparison in Ionizing Radiation, Section II (Measurement of Radionuclides)
Status   Approved for equivalence, Results available
  EUROMET.RI(II)- K2.I- 123 Activity of radionuclide I-123
1983
Comparison type, Field   Key comparison in Ionizing Radiation, Section II (Measurement of Radionuclides)
Status   Approved for equivalence, Results available
  BIPM.L- K10 Comparison of the frequencies of Helium-Neon lasers at wavelength 633 nm
1988 - 2000
Comparison type, Field   Key comparison in Length, Laser Frequencies
Status   Approved for equivalence, Results available
  CCEM.M- K1 Comparison of low frequency magnetic flux density
2001 -2003
Comparison type, Field   Key comparison in Electricity and Magnetism, Magnetism
Parameter(s)   Frequency: DC to 20 kHz
Status   Approved for equivalence, Results available
  CCQM- K1.c Nitrogen monoxide (NO) in Nitrogen (N2)
1995 - 1996
Comparison type, Field   Key comparison in Amount of Substance, Gases
Status   Approved for equivalence, Results available
  EUROMET.EM.BIPM- K11 DC voltage, Zener diode
1998 - 2000
Comparison type, Field   Key comparison in Electricity and Magnetism, DC Voltage and Current
DC voltage: 10 V
Status   Approved for equivalence, Results available
  EUROMET.EM- S4 Comparison of capacitors
1995 - 1998
Comparison type, Field   Supplementary comparison in Electricity and Magnetism, Capacitance
Capacitance: 100 pF
Parameter(s)   Frequency: 1 kHz or 1.592 kHz
Status   Published
  EUROMET.EM- S6 Comparison of electric field strength
1997 - 2002
Comparison type, Field   Supplementary comparison in Electricity and Magnetism, AC Voltage, Current, Power, and AC/DC Transfer
Parameter(s)   Frequency: 50 Hz
Status   Published