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)

Mongolia, MASM (Mongolian Agency for Standardization and Metrology)

Mass ,
Mass
:
**500 g**

Mass standards

Absolute expanded uncertainty
:
**0.27 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-13

KCDB ID :
APMP-M-MN-00000LBE-1

Mass ,
Mass
:
**1 kg**

Mass standards

Absolute expanded uncertainty
:
**0.4 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-14

KCDB ID :
APMP-M-MN-00000LBF-1

Mass ,
Mass
:
**5 kg**

Mass standards

Absolute expanded uncertainty
:
**2.2 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-16

KCDB ID :
APMP-M-MN-00000LBH-1

AC voltage (up to the MHz range) ,
AC voltage (up to the MHz range): AC voltage up to 1100 V, meters
:
**0.1 V to 1000 V**

AC voltage meter, multimeter

Absolute expanded uncertainty
:
**9.0E-3 mV to 1.1E2 mV**

Uncertainty table

{"row_1":{"col_1":"<br data-cke-eol=\"1\"><strong>Voltage</strong>","col_2":"<strong contenteditable=\"true\">Expanded uncertainty</strong>","col_3":"<strong contenteditable=\"true\">Expanded uncertainty</strong><br>","col_4":"<strong contenteditable=\"true\">Expanded uncertainty</strong>","col_5":"<strong contenteditable=\"true\">Expanded uncertainty</strong>","col_6":"<strong contenteditable=\"true\">Expanded uncertainty</strong>","col_7":"<strong contenteditable=\"true\">Expanded uncertainty</strong>","col_8":"<strong contenteditable=\"true\">Expanded uncertainty</strong><br>","col_9":"<strong contenteditable=\"true\">Expanded uncertainty</strong><br>","col_10":"<strong>Expanded uncertainty</strong><br>","col_11":"<strong>Expanded uncertainty</strong><br>","col_12":"<strong contenteditable=\"true\">Expanded uncertainty</strong><br>"},"row_2":{"col_1":"<br>","col_2":"<strong>10 Hz</strong><br>","col_3":"<strong>40 Hz</strong><br>","col_4":"<strong>500 Hz</strong>","col_5":"<strong>1 kHz</strong><br>","col_6":"<strong>10 kHz</strong><br>","col_7":"<strong>20 kHz</strong><br>","col_8":"<strong>50 kHz</strong><br>","col_9":"<strong contenteditable=\"true\">100 kHz</strong><br>","col_10":"<strong contenteditable=\"true\">200 kHz</strong><br>","col_11":"<strong>500 kHz</strong><br>","col_12":"<strong>1 MHz</strong>"},"row_3":{"col_1":"<strong>100 mV</strong><br><br>","col_2":"0.017","col_3":"0.0090 ","col_4":"0.0090","col_5":"0.0090 <br>","col_6":"0.0090 ","col_7":"0.0090 ","col_8":"0.016 ","col_9":"0.016 ","col_10":"0.054 <br>","col_11":"0.069 ","col_12":"0.10"},"row_4":{"col_1":"<strong>1 V</strong>","col_2":"0.11","col_3":"0.090","col_4":"0.090","col_5":"0.090","col_6":"0.090","col_7":"0.090","col_8":"0.090","col_9":"0.11 ","col_10":"0.21 ","col_11":"0.34 ","col_12":"0.48"},"row_5":{"col_1":"<strong>10 V</strong><br><br>","col_2":"1.1","col_3":"0.92 ","col_4":"0.92 <br>","col_5":"0.92 <br>","col_6":"0.92 ","col_7":"0.92 ","col_8":"0.92 ","col_9":"1.1","col_10":"2.0<br><br>","col_11":"3.3<br>","col_12":"3.9"},"row_6":{"col_1":"<strong>100 V</strong><br>","col_2":"<br>","col_3":"9.1","col_4":"9.0 ","col_5":"9.0 ","col_6":"9.0 ","col_7":"9.0 <br><br>","col_8":"11","col_9":"16","col_10":"","col_11":"","col_12":"<br>"},"row_7":{"col_1":"<strong>1000 V</strong><br>","col_2":"<br>","col_3":"91 <br><br>","col_4":"90<br><br>","col_5":"92<br><br>","col_6":"93","col_7":"110 ","col_8":"<br>","col_9":"<br>","col_10":"<br>","col_11":"<br>","col_12":"<br>"}}

Uncertainties given in mV.

Direct measurement

Frequency : 10 Hz to 1 MHz

Temperature : 23 ^{o}C __+__ 2 ^{o}C

Approved on 13 February 2023

Institute service identifier : EM-ACV-1

KCDB ID :
APMP-EM-MN-00000NYP-1

DC voltage (up to 1100 V) ,
DC voltage meters, intermediate values
:
**2.00E-3 V to 1000 V**

DC voltmeter, multimeter

Absolute expanded uncertainty
:
**1.1E-3 mV to 6.2 mV**

Uncertainty table

{"row_1":{"col_1":"<strong>Voltage</strong>","col_2":"<strong>Expanded uncertainty</strong>"},"row_2":{"col_1":"2 mV ≤ <em>V</em> ≤ 100 mV","col_2":"0.0011"},"row_3":{"col_1":"100 mV < <em>V</em> ≤ 1 V","col_2":"0.005 <br><br>"},"row_4":{"col_1":"1 V < <em>V</em> ≤ 10 V","col_2":"0.045<br><br>"},"row_5":{"col_1":"10 < <em>V</em> ≤ 100 V","col_2":"0.49<br><br>"},"row_6":{"col_1":"100 V < <em>V</em> ≤ 1000 V","col_2":"6.2"}}

Uncertainties given in mV

Direct measurement

Temperature : 23 °C __+__ 2 °C

Approved on 19 February 2023

Institute service identifier : EM-DCV-1

KCDB ID :
APMP-EM-MN-00000NYN-1

Mass ,
Mass
:
**100 mg**

Mass standards

Absolute expanded uncertainty
:
**3.0E-3 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-02

KCDB ID :
APMP-M-MN-00000LB3-1

Mass ,
Mass
:
**200 mg**

Mass standards

Absolute expanded uncertainty
:
**4.0E-3 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-03

KCDB ID :
APMP-M-MN-00000LB4-1

Mass ,
Mass
:
**2 kg**

Mass standards

Absolute expanded uncertainty
:
**1 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-15

KCDB ID :
APMP-M-MN-00000LBG-1

AC power ,
AC power: single phase (frequency <= 400 Hz)
:
**1 W to 4.80E4 W**

Power meter, power converter, power comparator, wattmeter

Relative expanded uncertainty
:
**1.2E2 µW/VA to 1.7E2 µW/VA**

Uncertainty table

{"row_1":{"col_1":"Method","col_2":"Current","col_3":"Relative expanded uncertainty"},"row_2":{"col_1":"Direct comparison","col_2":"<em>I</em> ≤ 100 A","col_3":"170"},"row_3":{"col_1":"Direct comparison<br>","col_2":"0.5 A ≤ <em>I</em> ≤ 50 A","col_3":"120"},"row_4":{"col_1":"Direct comparison<br>","col_2":"0.01 A ≤ <em>I</em> < 0.5 A","col_3":"170"}}

The expanded uncertainty given in this table are expressed in µW/VA.

Direct comparision

Voltage : 100 V to 480 V

Frequency : 50 Hz

Current : 0.01 A to 100 A

Power factor : 1, 0.5L, 0.5C

Approved on 15 February 2023

Institute service identifier : EM-P-1

KCDB ID :
APMP-EM-MN-00000NYL-1

Mass ,
Mass
:
**500 mg**

Mass standards

Absolute expanded uncertainty
:
**6.0E-3 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-04

KCDB ID :
APMP-M-MN-00000LB5-1

Mass ,
Mass
:
**200 g**

Mass standards

Absolute expanded uncertainty
:
**0.1 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-12

KCDB ID :
APMP-M-MN-00000LBD-1

AC power ,
AC power and energy: three phase
:
**1 W to 1.44E5 W**

Power meter, wattmeter, power comparator

Relative expanded uncertainty
:
**1.2E2 µW/VA to 1.7E2 µW/VA**

Uncertainty table

{"row_1":{"col_1":"Method","col_2":"Current","col_3":"Relative expanded uncertainty"},"row_2":{"col_1":"Direct comparison","col_2":"<em>I</em> ≤ 100 A","col_3":"170<br><br>"},"row_3":{"col_1":"Direct comparison<br>","col_2":"0.5 A ≤ <em>I</em> ≤ 50 A","col_3":"120<br><br>"},"row_4":{"col_1":"Direct comparison<br>","col_2":"0.01 A ≤ <em>I</em> < 0.5 A","col_3":"170"}}

The expanded uncertainty given in this table are expressed in µW/VA.

Direct comparison

Voltage : 100 V to 480 V

Frequency : 50 Hz

Current : 0.01 A to 100 A

Power factor : 1, 0.5L, 0.5C

Approved on 15 February 2023

Institute service identifier : EM-P-2

KCDB ID :
APMP-EM-MN-00000NYM-1

Mass ,
Mass
:
**10 g**

Mass standards

Absolute expanded uncertainty
:
**1.9E-2 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-08

KCDB ID :
APMP-M-MN-00000LB9-1

Mass ,
Mass
:
**50 g**

Mass standards

Absolute expanded uncertainty
:
**3.3E-2 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-10

KCDB ID :
APMP-M-MN-00000LBB-1

DC current (up to 100 A) ,
DC current meters intermediate values
:
**0.01 A to 1 A**

DC current meter, multimeter

Absolute expanded uncertainty
:
**4.0E-4 mA to 9.3E-2 mA**

Uncertainty table

{"row_1":{"col_1":"<strong>Current </strong><br>","col_2":"<strong>Expanded uncertainty</strong><br>"},"row_2":{"col_1":"<em> I</em> = 10 mA","col_2":"0.0004<br><br>"},"row_3":{"col_1":"10 mA < <em>I</em> ≤ 100 mA","col_2":"0.004<br><br>"},"row_4":{"col_1":"100 mA < <em>I </em>≤ 1 A <br>","col_2":"0.093"}}

Uncertainties given in mA

Direct measurement

Temperature : 23 °C __+__ 2 °C

Approved on 19 February 2023

Institute service identifier : EM-DCI-1

KCDB ID :
APMP-EM-MN-00000NYO-1

Linear dimensions ,
central length L
:
**0.5 mm to 100 mm**

Gauge block

Absolute expanded uncertainty
:
**7.0E1 nm to 1.5E2 nm**

Q[70 nm,1.3E-06L]

Gauge blocks comparison by mechanical comparison method

ISO 3650:1998(E)

Approved on 31 October 2022

Institute service identifier : 01.003.01

KCDB ID :
APMP-L-MN-00000NZR-1

Mass ,
Mass
:
**1 mg to 50 mg**

Mass standards

Absolute expanded uncertainty
:
**2.0E-3 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-01

KCDB ID :
APMP-M-MN-00000LB2-1

Mass ,
Mass
:
**1 g**

Mass standards

Absolute expanded uncertainty
:
**9.0E-3 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-05

KCDB ID :
APMP-M-MN-00000LB6-1

Mass ,
Mass
:
**2 g**

Mass standards

Absolute expanded uncertainty
:
**1.0E-2 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-06

KCDB ID :
APMP-M-MN-00000LB7-1

Mass ,
Mass
:
**100 g**

Mass standards

Absolute expanded uncertainty
:
**5.3E-2 mg**

Comparison in air

Air density : OIML R 111

Approved on 29 May 2020

Institute service identifier : M-11

KCDB ID :
APMP-M-MN-00000LBC-1

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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.