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)

Finland, FGI (Finnish Geospatial Research Institute)

Gravity ,
Gravitational acceleration
:
**9.75 m/s**^{2} to 9.85 m/s^{2}

On (stable) site

Absolute expanded uncertainty
:
**8.0E-8 m/s**^{2}

Free fall experiment

Ambient temperature : 21 °C ± 8 °C

Approved on 03 January 2007

Finland, MIKES (VTT Technical Research Centre of Finland Ltd, Centre for Metrology/Mittatekniikan keskus)

Linear vibration ,
Charge sensitivity (phase shift)
:
**0 ° to 360 °**

Accelerometer

Absolute expanded uncertainty
:
**1 °**

ISO 16063-21 (comparison)

Frequency : 10 Hz to 1 kHz

Approved on 18 June 2014

Institute service identifier : MIKES/V21.3.1.2.A

Sound calibrators ,
Sound pressure level
:
**94 dB (reference: 20 µPa) to 114 dB (reference: 20 µPa)**

Sound calibrator, multi-frequency

Absolute expanded uncertainty
:
**0.15 dB**

Calibrated measurement microphone

Frequency : 8 kHz to 12.5 kHz

Microphone type : LS2P

Approved on 09 November 2006

Linear vibration ,
Voltage sensitivity (modulus)

Acceleration measuring chain

Relative expanded uncertainty
:
**1.5 %**

ISO 16063-21 (comparison)

Frequency : 1.25 kHz to 4.5 kHz

Approved on 18 June 2014

Institute service identifier : MIKES/V21.4.1.1.B

Measurement microphones ,
Pressure sensitivity level

Measurement microphone type LS2

Absolute expanded uncertainty
:
**5.0E-2 dB**

IEC 61094-2:1992

Frequency : 125 Hz to 8 kHz

Approved on 09 November 2006

Measurement microphones ,
Pressure sensitivity level

Measurement microphone type LS2

Absolute expanded uncertainty
:
**8.0E-2 dB**

IEC 61094-2:1992

Frequency : 31.5 Hz

Approved on 09 November 2006

Measurement microphones ,
Pressure sensitivity level

Measurement microphone type LS1

Absolute expanded uncertainty
:
**5.0E-2 dB**

IEC 61094-2:1992

Frequency : 4 kHz

Approved on 09 November 2006

Items for defining ITS-90 ,
Temperature
:
**419.527 °C**

Long-stem SPRT

Absolute expanded uncertainty
:
**2.0E-3 °C**

Fixed point

Temperature-controlled furnace : 419 °C

Standard: Zinc cell

Approved on 18 May 2004

Items for defining ITS-90 ,
Temperature
:
**660.323 °C**

Aluminium cell

Absolute expanded uncertainty
:
**1.0E-2 °C**

Direct comparison

Temperature-controlled furnace : 659 °C

Approved on 18 May 2004

Items for defining ITS-90 ,
Temperature
:
**29.7646 °C**

Gallium cell

Absolute expanded uncertainty
:
**1.0E-3 °C**

Direct comparison

Temperature-controlled bath : 29.7 °C

Approved on 18 May 2004

Items for defining ITS-90 ,
Temperature
:
**231.928 °C**

Tin cell

Absolute expanded uncertainty
:
**9.0E-4 °C**

Direct comparison

Temperature-controlled furnace : 231 °C

Approved on 18 May 2004

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

Long-stem SPRT

Absolute expanded uncertainty
:
**2.0E-3 °C**

Fixed point

Standard: Argon cell Cryostat

Approved on 18 May 2004

Mass ,
Mass
:
**50 kg to 2000 kg**

Mass standard

Absolute expanded uncertainty
:
**1.0E2 mg to 3.0E3 mg**

Comparison in air

Uncertainty scales with measurand level

Approved on 11 June 2017

Torque ,
Torque
:
**4 N m to 20 N m**

Torque measuring device

Relative expanded uncertainty
:
**8.0E-4**

Mode : clockwise, anticlockwise

Approved on 11 October 2005

AC power ,
AC power and energy: three phase, active energy
:
**0 kWh to 0.35 kWh**

Active energy meter

Relative expanded uncertainty
:
**1.2E2 µWh (VAh)**^{-1}

Comparison with standard

Voltage : 50 V to 350 V

Current : 0.005 A to 12 A

Power factor : 1 to 0, inductive or capacitive

Frequency : 45 Hz to 65 Hz

Measurement time : 1 s to 100 s

Voltage and current ranges are per phase

Approved on 06 August 2013

Institute service identifier : MIKES/189c

Impedance (up to the MHz range) ,
Inductance: self inductance, intermediate values
:
**0.1 mH to 100 mH**

Fixed inductor

Relative expanded uncertainty
:
**2.0E1 µH/H to 1.0E2 µH/H**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Method of measurement","col_3":"Reference standard used in calibration","col_4":"Frequency","col_5":"Relative expanded uncertainty"},"row_2":{"col_1":"100 mH","col_2":"Series resonance","col_3":"Capacitance standard","col_4":"1 kHz, 1.592 kHz","col_5":"20"},"row_3":{"col_1":"10 mH to 100 mH","col_2":"2 DVM","col_3":"Resistance standard","col_4":"50 Hz to 1000 Hz","col_5":"50"},"row_4":{"col_1":"100 µH to 10 mH","col_2":"2 DVM","col_3":"Resistance standard","col_4":"50 Hz to 2000 Hz","col_5":"20"}}

The expanded uncertainty given in this table are expressed in µH/H

2 DVM, series resonance

Frequency : 50 Hz to 2000 Hz, 1592 Hz

Approved on 11 May 2017

Institute service identifier : MIKES/93n

AC power ,
AC power and energy: three phase, reactive power
:
**0 kvar to 12.6 kvar**

Power meter

Relative expanded uncertainty
:
**2.5E2 µvar (VA)**^{-1}

Comparison with standard

Voltage : 50 V to 350 V

Current : 0.005 A to 12 A

Power factor : 1 to 0, inductive or capacitive

Frequency : 45 Hz to 65 Hz

Voltage and current ranges are per phase

Approved on 06 August 2013

Institute service identifier : MIKES/190b

High voltage and current ,
High AC voltage: peak values
:
**0 % to 10 %**

linearity of peak voltage responding measuring system, AC voltmeter, AC voltaqe source

Relative expanded uncertainty
:
**0.1 %**

Linearity extension according to IEC 60060-2

Voltage range : 100 kV to 1000 kV

Frequency : 46 Hz to 60 Hz

Approved on 11 May 2017

Institute service identifier : MIKES/HV16a

DC current (up to 100 A) ,
DC current sources: intermediate values
:
**1.00E-4 A to 20 A**

Multifunction calibrator

Relative expanded uncertainty
:
**5 µA/A to 2.0E1 µA/A**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Relative expanded uncertainty","col_3":"Method of measurement"},"row_2":{"col_1":"0.1 mA to 100 mA","col_2":"5","col_3":"Voltage across resistance standard"},"row_3":{"col_1":"0.1 A to 2 A","col_2":"5 to 10","col_3":"Voltage across resistance standard"},"row_4":{"col_1":"2 A to 20 A","col_2":"10 to 20","col_3":"Voltage across resistance standard"},"row_5":{"col_1":"0.1 mA to 1 A","col_2":"10","col_3":"Comparison with digital multimeter"}}

The expanded uncertainty given in this table are expressed in µA/A

Voltage across resistance standard, comparison with digital multimeter

Approved on 06 August 2013

Institute service identifier : MIKES/68n

AC current ,
AC current up to 100 A: sources
:
**0.025 A to 10 A**

Multifunction calibrator, AC current source

Relative expanded uncertainty
:
**2.5E1 µA/A**

Direct comparison

Frequency : 45 Hz to 65 Hz

Approved on 06 August 2013

Institute service identifier : MIKES/179a

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.