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
- CMC Quick search
- CMC Advanced search

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)

Denmark, Trescal (Trescal Ltd)

AC voltage (up to the MHz range) ,
AC voltage: AC/DC transfer difference at medium voltage
:
**0.5 V to 5 V**

Thermal converter with range extender

Relative expanded uncertainty
:
**2 µV/V to 3.0E1 µV/V**

Uncertainty table

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The expanded uncertainties in this table are expressed in µV/V

Comparison

Frequency : 10 Hz to 1 MHz

Approved on 06 August 2013

Institute service identifier : 15b

AC current ,
AC current up to 100 A: sources
:
**1.00E-5 A to 100 A**

Multifunction calibrator, AC current generator

Relative expanded uncertainty
:
**1.5E1 µA/A to 3.3E2 µA/A**

Uncertainty table

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The expanded uncertainties in this table are expressed in µA/A

AC/DC transfer difference, comparison: current transformer, current shunt

Frequency : 10 Hz to 100 kHz

Approved on 06 August 2013

Impedance (up to the MHz range) ,
Inductance: self inductance, low values
:
**0.1 mH to 1 mH**

Fixed inductor, variable inductor, inductance box

Relative expanded uncertainty
:
**0.7 mH/H to 0.8 mH/H**

Comparison: LCR meter

Frequency : 100 Hz to 10 kHz

Approved on 06 August 2013

AC voltage (up to the MHz range) ,
AC voltage up to 1000 V: meters
:
**1.00E-3 V to 1000 V**

AC voltmeter, multimeter, multifunction transfer standard

Relative expanded uncertainty
:
**5 µV/V to 7.0E2 µV/V**

Uncertainty table

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The expanded uncertainties in this table are expressed in µV/V

AC/DC transfer difference

Frequency : 10 Hz to 1 MHz

Approved on 06 August 2013

Institute service identifier : 14a

AC voltage (up to the MHz range) ,
AC voltage up to 1000 V: sources
:
**1.00E-3 V to 1000 V**

Multifunction calibrator, AC voltage generator

Relative expanded uncertainty
:
**5 µV/V to 7.0E2 µV/V**

Uncertainty table

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The expanded uncertainties in this table are expressed in µV/V

AC/DC transfer difference

Frequency : 10 Hz to 1 MHz

Approved on 06 August 2013

AC power ,
AC power: single phase (frequency <= 400 Hz)
:
**1.00E-3 kW to 20 kW**

Power meter, power converter, wattmeter

Relative expanded uncertainty
:
**2.4E1 µW (VA)**^{-1} to 1.7E2 µW (VA)^{-1}

Voltage and current (AC/DC transfer difference), phasemeter

Frequency : 10 Hz to 400 Hz

Current : 100 mA to 20 A

Voltage : 10 V to 1000 V

Power factor : 0 to 1, inductive or capacitive

Approved on 06 August 2013

Radio frequency measurements ,
RF power: absolute power in coaxials
:
**1.00E-9 W to 0.01 W**

Power source

Relative expanded uncertainty
:
**0.4 % to 6 %**

Power sensor

Frequency : 0.1 GHz to 3 GHz

Impedance : 75 Ω

Approved on 06 August 2013

Institute service identifier : 41b

AC power ,
AC power: single phase (frequency >= 400 Hz)
:
**20 kW to 100 kW**

Power meter, power converter, wattmeter

Relative expanded uncertainty
:
**7.4E1 µW (VA)**^{-1} to 1.8E3 µW (VA)^{-1}

Voltage and current (AC/DC transfer difference), phasemeter

Frequency : 400 Hz to 100 kHz

Current : 20 A to 100 A

Voltage : 10 V to 1000 V

Power factor : 0 to 1, inductive or capacitive

Approved on 06 August 2013

Institute service identifier : 31a

AC power ,
AC power: single phase (frequency >= 400 Hz)
:
**1.00E-3 kW to 20 kW**

Power meter, power converter, wattmeter

Relative expanded uncertainty
:
**2.4E1 µW (VA)**^{-1} to 1.8E3 µW (VA)^{-1}

Voltage and current (AC/DC transfer difference), phasemeter

Frequency : 400 Hz to 100 kHz

Current : 100 mA to 20 A

Voltage : 10 V to 1000 V

Power factor : 0 to 1, inductive or capacitive

Approved on 06 August 2013

High voltage and current ,
High AC voltage: RMS value
:
**1 kV to 40 kV**

RMS voltage responding measuring system, AC voltmeter, AC voltage source

Relative expanded uncertainty
:
**2.1E1 mV/V to 3.0E1 mV/V**

Comparison

Frequency : 10 Hz to 1 kHz

Approved on 06 August 2013

Institute service identifier : 39a

High voltage and current ,
High AC voltage: RMS value
:
**1 kV to 6 kV**

RMS voltage responding measuring system, AC voltmeter, AC voltage source

Relative expanded uncertainty
:
**1.2E1 mV/V to 2.4E1 mV/V**

Comparison

Frequency : 10 Hz to 1 kHz

Approved on 06 August 2013

Institute service identifier : 39e

Impedance (up to the MHz range) ,
AC resistance: AC/DC difference
:
**0.1 kΩ to 100 kΩ**

Fixed resistor

Relative expanded uncertainty
:
**1.0E3 µΩ/Ω**

Comparison with AC/DC transfer standard

Frequency : 100 Hz to 10 kHz

Approved on 06 August 2013

Institute service identifier : 8b

Impedance (up to the MHz range) ,
Capacitance for low loss capacitors
:
**0.01 pF to 1.00E7 pF**

Standard capacitor, variable capacitor

Relative expanded uncertainty
:
**5 µF/F to 3.6E2 µF/F**

Uncertainty table

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The expanded uncertainties in this table are expressed in µF/F

Comparison: capacitance bridge, LCR meter

Frequency : 50 Hz to 10 kHz

Approved on 06 August 2013

Radio frequency measurements ,
Scalar RF reflection and attenuation: directivity
:
**0 to 1**

Multiports

Absolute expanded uncertainty
:
**2.0E-3 to 0.33**

Precision load, sliding load

Frequency : 0.1 GHz to 18 GHz

Impedance : 50 Ω

Approved on 06 August 2013

Institute service identifier : 46a

Impedance (up to the MHz range) ,
AC resistance: AC/DC difference
:
**0.1 Ω to 100 Ω**

Fixed resistor

Relative expanded uncertainty
:
**7.7E2 µΩ/Ω**

Comparison with AC/DC transfer standard

Frequency : 100 Hz to 10 kHz

Approved on 06 August 2013

Institute service identifier : 8a

Impedance (up to the MHz range) ,
AC resistance: real component
:
**0.1 Ω to 100 Ω**

Fixed resistor

Relative expanded uncertainty
:
**7.7E2 µΩ/Ω**

Comparison: LCR meter

Frequency : 100 Hz to 10 kHz

Approved on 06 August 2013

Impedance (up to the MHz range) ,
Capacitance: meters
:
**0.01 pF to 1.00E7 pF**

Capacitance bridge, LCR meter

Relative expanded uncertainty
:
**5 µF/F to 3.6E2 µF/F**

Uncertainty table

{"row_1":{"col_1":"","col_2":"50 Hz","col_3":"100 Hz","col_4":"1 kHz","col_5":"10 kHz"},"row_2":{"col_1":"10 fF","col_2":"-","col_3":"360","col_4":"360","col_5":"360"},"row_3":{"col_1":"100 fF","col_2":"-","col_3":"340","col_4":"250","col_5":"320"},"row_4":{"col_1":"1 pF","col_2":"360","col_3":"320","col_4":"120","col_5":"120"},"row_5":{"col_1":"10 pF","col_2":"120","col_3":"80","col_4":"50","col_5":"50"},"row_6":{"col_1":"100 pF","col_2":"50","col_3":"15","col_4":"10","col_5":"15"},"row_7":{"col_1":"1 nF","col_2":"25","col_3":"8","col_4":"5","col_5":"8"},"row_8":{"col_1":"10 nF","col_2":"50","col_3":"15","col_4":"10","col_5":"15"},"row_9":{"col_1":"100 nF","col_2":"100","col_3":"70","col_4":"25","col_5":"50"},"row_10":{"col_1":"1 µF","col_2":"260","col_3":"150","col_4":"50","col_5":"100"},"row_11":{"col_1":"10 µF","col_2":"360","col_3":"320","col_4":"200","col_5":"350"}}

The expanded uncertainties in this table are expressed in µF/F

Standard capacitors

Frequency : 50 Hz to 10 kHz

Approved on 06 August 2013

Institute service identifier : 11b

AC power ,
AC energy: single phase (frequency >= 400 Hz)
:
**0.01 MJ to 200 MJ**

Energy meter

Relative expanded uncertainty
:
**2.5E1 µJ/(VAs) to 1.8E3 µJ/(VAs)**

Voltage and current (AC/DC transfer difference), phasemeter, time interval

Frequency : 400 Hz to 100 kHz

Current : 100 mA to 20 A

Voltage : 10 V to 1000 V

Power factor : 0 to 1, inductive or capacitive

Measurement time : 1 ks to 10 ks

Approved on 06 August 2013

AC power ,
AC energy: single phase (frequency <= 400 Hz)
:
**1.00E-3 J to 1.00E4 J**

Energy meter

Relative expanded uncertainty
:
**2.1E1 µJ/(VAs) to 2.7E2 µJ/(VAs)**

Voltage and current (AC/DC transfer difference), phasemeter, time interval

Frequency : 10 Hz to 400 Hz

Current : 10 µA to 100 mA

Voltage : 100 mV to 10 V

Power factor : 0 to 1, inductive or capacitive

Measurement time : 1 ks to 10 ks

Approved on 06 August 2013

AC power ,
AC power: single phase (frequency <= 400 Hz)
:
**100 kW to 1000 kW**

Power meter, power converter, wattmeter

Relative expanded uncertainty
:
**7.4E1 µW (VA)**^{-1} to 7.8E2 µW (VA)^{-1}

Voltage and current (AC/DC transfer difference), phasemeter

Frequency : 10 Hz to 400 Hz

Current : 100 A to 1000 A

Voltage : 1000 V

Power factor : 0 to 1, inductive or capacitive

Approved on 06 August 2013

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.