The KCDB - the BIPM key comparison database – supports the CIPM MRA. The KCDB contains information on the internationally recognized Calibration and Measurement Capabilities (CMCs) for services available from the participating institutes, and the key and supplementary comparisons supporting these CMCs.

All data listed in the KCDB have been reviewed and approved within the CIPM Mutual Recognition Arrangement
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In the CMCs uncertainty statements, the notation Q[*a*, *b*] stands for the root-sum-square of the terms between brackets: Q[*a*, *b*] = [*a*^{ 2} + *b*^{ 2}]^{1/2}

*Unless otherwise stated the expanded uncertainties given below correspond to **k* = 2 (at a 95 % level of confidence)

Belgium, SMD (Service de la Métrologie Belge)

Items for defining ITS-90 ,
Temperature
:
**-189 °C to 0 °C**

Long stem SPRT

Absolute expanded uncertainty
:
**1.4 mK**

Measurement at fixed points

Ambient temperature : (22 ± 1) °C

Three zone furnace

Approved on 17 January 2013

Institute service identifier : SMD/3.1

Items for defining ITS-90 ,
Temperature
:
**0.01 °C**

Long stem SPRT

Absolute expanded uncertainty
:
**0.3 mK**

Measurement at water triple point

Temperature-controlled bath

Approved on 20 January 2010

Institute service identifier : SMD/2.3

Items for defining ITS-90 ,
Temperature
:
**-38.8344 °C**

Long stem SPRT

Absolute expanded uncertainty
:
**0.7 mK**

Measurement at mercury point

Temperature controlled bath

Approved on 20 May 2010

Institute service identifier : SMD/2.2

Items for defining ITS-90 ,
Temperature
:
**-189.3442 °C**

Argon cell

Absolute expanded uncertainty
:
**0.8 mK**

Direct comparison

Adiabatic calorimeter

Approved on 20 May 2010

Institute service identifier : SMD/1.1

Impedance (up to the MHz range) ,
Capacitance for low loss capacitors
:
**1 pF to 1000 pF**

Fixed capacitor:
air, 4TP

Relative expanded uncertainty
:
**1.7E2 µF/F to 1.7E3 µF/F**

Uncertainty table

{"row_1":{"col_1":"","col_2":"100 Hz","col_3":"1 kHz","col_4":"10 kHz","col_5":"100 kHz","col_6":"1 MHz"},"row_2":{"col_1":"1 pF","col_2":"-","col_3":"620","col_4":"180","col_5":"290","col_6":"1700"},"row_3":{"col_1":"10 pF","col_2":"-","col_3":"210","col_4":"170","col_5":"240","col_6":"990"},"row_4":{"col_1":"100 pF","col_2":"-","col_3":"170","col_4":"170","col_5":"180","col_6":"420"},"row_5":{"col_1":"1 nF","col_2":"-","col_3":"170","col_4":"170","col_5":"200","col_6":"540"},"row_6":{"col_1":"10 nF","col_2":"100","col_3":"80","col_4":"220","col_5":"240","col_6":"-"},"row_7":{"col_1":"100 nF","col_2":"100","col_3":"80","col_4":"220","col_5":"240","col_6":"-"},"row_8":{"col_1":"1 µF","col_2":"140","col_3":"120","col_4":"400","col_5":"450","col_6":"-"}}

The expanded uncertainties are expressed in µF/F

Substitution

Frequency : 1 kHz to 1 MHz

Approved on 06 August 2013

Institute service identifier : SMD/69

DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
**1 V to 10 V**

Solid state voltage standard

Relative expanded uncertainty
:
**1.0E2 nV/V to 1.5E2 nV/V**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (nV/V)","col_3":"Method of measurement","col_4":"Reference standard used in calibration"},"row_2":{"col_1":"1 V","col_2":"150","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"},"row_3":{"col_1":"1.018 V","col_2":"150","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"},"row_4":{"col_1":"10 V","col_2":"100","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"}}

The expanded uncertainties are expressed in nV

Direct comparison with standard

Fixed voltage : 1 V, 1.018 V, 10 V

Approved on 07 February 2019

Institute service identifier : SMD/1

Items for defining ITS-90 ,
Temperature
:
**0 °C to 231 °C**

Long stem SPRT

Absolute expanded uncertainty
:
**2.1 mK**

Measurement at fixed points

Ambient temperature : (22 ± 1) °C

Three zone furnace

Approved on 17 January 2013

Institute service identifier : SMD/3.5

Items for defining ITS-90 ,
Temperature
:
**-38 °C to 29 °C**

Long stem SPRT

Absolute expanded uncertainty
:
**0.8 mK**

Measurement at fixed points

Ambient temperature : (22 ± 1) °C

Three zone furnace

Approved on 17 January 2013

Institute service identifier : SMD/3.2

Mass ,
Mass
:
**1 mg to 100 mg**

Mass standard

Absolute expanded uncertainty
:
**1 µg to 2 µg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**1000 kg to 5000 kg**

Mass standard

Absolute expanded uncertainty
:
**1.0E1 g to 5.0E1 g**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**0.1 kg to 1 kg**

Mass standard

Absolute expanded uncertainty
:
**1.5E1 µg to 1.5E2 µg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**10 g to 100 g**

Mass standard

Absolute expanded uncertainty
:
**7 µg to 1.5E1 µg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**0.1 g to 1 g**

Mass standard

Absolute expanded uncertainty
:
**2 µg to 3 µg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**1 g to 10 g**

Mass standard

Absolute expanded uncertainty
:
**3 µg to 7 µg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Linear dimensions ,
Diameter standards
:
**0.5 mm to 300 mm**

External cylinder (plug): diameter *D*

Absolute expanded uncertainty
:
**0.14 µm to 0.3 µm**

Q[0.14 µm, 0.86E-06 *D*]

1-D comparator and 2 spherical probes

Reference : plug

Approved on 10 October 2017

Institute service identifier : 2.2.4.1a

Impedance (up to the MHz range) ,
Capacitance: capacitance for low loss capacitors
:
**1 pF to 1000 pF**

Fixed capacitor, decadic values, air, 4TP

Relative expanded uncertainty
:
**1.7E2 µF/F to 2.1E2 µF/F**

Uncertainty table

{"row_1":{"col_1":"<br>","col_2":"1 kHz"},"row_2":{"col_1":"1 pF","col_2":"210"},"row_3":{"col_1":"10 pF","col_2":"210"},"row_4":{"col_1":"100 pF","col_2":"210"},"row_5":{"col_1":"1000 pF","col_2":"170"},"row_6":{"col_1":"","col_2":""},"row_7":{"col_1":"","col_2":""},"row_8":{"col_1":"","col_2":""}}

Uncertainty expressed in µF/F

Substitution

Frequency : 1 kHz

LCR meter

Approved on 10 June 2021

Institute service identifier : 5.4.2.1b

Mass ,
Mass
:
**100 kg to 1000 kg**

Mass standard

Absolute expanded uncertainty
:
**2 g to 1.0E1 g**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Mass ,
Mass
:
**1 kg to 10 kg**

Mass standard

Absolute expanded uncertainty
:
**0.15 mg to 5 mg**

Comparison in air

Uncertainty scales with measurand level The volume of the mass standards is known

Approved on 21 October 2001

Impedance (up to the MHz range) ,
Capacitance: dissipation factor for dielectric capacitors
:
**-1.50E-3 to 0.025**

Fixed capacitor:
silvered mica, 4TP

Absolute expanded uncertainty

Uncertainty table

{"row_1":{"col_1":"","col_2":"100 Hz","col_3":"1 kHz","col_4":"10 kHz","col_5":"100 kHz","col_6":"1 MHz"},"row_2":{"col_1":"1 pF","col_2":"-","col_3":"6.00E-04","col_4":"9.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_3":{"col_1":"10 pF","col_2":"-","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_4":{"col_1":"100 pF","col_2":"-","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_5":{"col_1":"1 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_6":{"col_1":"10 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"2.80E-04","col_5":"3.00E-04","col_6":"-"},"row_7":{"col_1":"100 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"2.80E-04","col_5":"3.00E-04","col_6":"-"},"row_8":{"col_1":"1 µF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"3.00E-04","col_5":"3.20E-04","col_6":"-"}}

The expanded uncertainties are dimensionless

7E-05 to 3.2E-04

Substitution

Frequency : 100 Hz to 100 kHz

Capacitance : 10 nF to 1 µF

Approved on 06 August 2013

Institute service identifier : SMD/74

Impedance (up to the MHz range) ,
Capacitance: dissipation factor for low loss capacitors
:
**1.00E-6 to 5.00E-4**

Fixed capacitor:
air, 4TP

Absolute expanded uncertainty

Uncertainty table

{"row_1":{"col_1":"","col_2":"100 Hz","col_3":"1 kHz","col_4":"10 kHz","col_5":"100 kHz","col_6":"1 MHz"},"row_2":{"col_1":"1 pF","col_2":"-","col_3":"6.00E-04","col_4":"9.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_3":{"col_1":"10 pF","col_2":"-","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_4":{"col_1":"100 pF","col_2":"-","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_5":{"col_1":"1 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"7.00E-05","col_5":"1.00E-04","col_6":"6.00E-04"},"row_6":{"col_1":"10 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"2.80E-04","col_5":"3.00E-04","col_6":"-"},"row_7":{"col_1":"100 nF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"2.80E-04","col_5":"3.00E-04","col_6":"-"},"row_8":{"col_1":"1 µF","col_2":"1.00E-04","col_3":"7.00E-05","col_4":"3.00E-04","col_5":"3.20E-04","col_6":"-"}}

The expanded uncertainties are dimensionless

7E-05 to 6E-04

Substitution

Frequency : 1 kHz to 1 MHz

Capacitance : 1 pF to 1000 pF

Approved on 06 August 2013

Institute service identifier : SMD/73a

Acoustics, Ultrasound, Vibration

This metrology area covers the fields of acoustics, ultrasound and vibration.

Electricity and Magnetism

This metrology area covers the fields of DC and AC measurements, impedance, electric and magnetic fields, radiofrequencies and measurements on materials.

Length

This metrology area covers the fields of laser frequencies and dimensional metrology.

Mass and related quantities

This metrology area covers the fields of mass standards, force, pressure, density, hardness, torque, gravity and viscosity.

Chemistry and Biology

This metrology area covers all fields relevant to chemistry and biology.

Ionizing Radiation

This metrology area covers the fields of dosimetry, radioactivity and neutron measurements.