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)

Costa Rica, LAMETRO-ICE (Laboratorio de Metrologia, Instituto Costarricense de Electricidad)

Frequency ,
Frequency
:
**1 MHz**

Local frequency standard

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequency measurement of oscillator

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.1.2

KCDB ID :
SIM-TF-CR-00000O0C-1

Frequency ,
Frequency
:
**1.00E6 Hz to 2.25E8 Hz**

General frequency source

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequency measurement

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.2.3

KCDB ID :
SIM-TF-CR-00000O0H-1

Time interval ,
Time interval
:
**8.64E4 s to 6.05E5 s**

Period meter

Relative expanded uncertainty
:
**2.0E-7 s/s to 7.0E-7 s/s**

Visual comparison against standard time display

Averaging time : 1 day to 5 days

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 3.3.2

KCDB ID :
SIM-TF-CR-00000O0L-1

Fibre optics ,
Responsivity

Fibre optic power meter

Relative expanded uncertainty
:
**1.1 %**

Laser source and reference fibre optic power meter

IEC 61315

Temperature : (23 ± 2) ºC

Humidity : (40 ± 10) %

Wavelength : 1310 nm and 1550 nm

Optical power level : 100 μW (-10 dBm)

Bandwidth : < 5 nm

Approved on 01 October 2022

Institute service identifier : LM-I-008

KCDB ID :
SIM-PR-CR-00000NG2-1

Time interval ,
Time interval
:
**3.28E4 Hz**

Period meter

Relative expanded uncertainty
:
**2.0E-10 s/s**

Direct frequency measurement of internal quartz oscillator

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 3.3.1

KCDB ID :
SIM-TF-CR-00000O0K-1

Frequency ,
Frequency
:
**100 kHz**

Local frequency standard

Relative expanded uncertainty
:
**5.0E-11 Hz/Hz**

Direct frequency measurement of oscillator

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.1.1

KCDB ID :
SIM-TF-CR-00000O0B-1

Frequency ,
Frequency
:
**1.00E4 Hz to 2.25E8 Hz**

Frequency meter

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequecy measurement of its time base

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.3.2

KCDB ID :
SIM-TF-CR-00000O0J-1

Fibre optics ,
Optical Length (distance scale deviation)
:
**7.5 km to 100 km**

OTDR

Relative expanded uncertainty
:
**2.4E-5 m/m to 3.4E-5 m/m**

Uncertainty table

{"row_1":{"col_1":"Nominal Walelength (nm)","col_2":"Expanded Uncertainty (m/m) (k=2)"},"row_2":{"col_1":"1310","col_2":"2.4E-5"},"row_3":{"col_1":"1550","col_2":"3.4E-5"}}

Recirculating delay line

IEC 61746-1

Temperature : (23 ± 2) °C

Humidity : (40 ± 10) %

Nominal wavelength : 1310 nm and 1550 nm

Approved on 01 October 2022

Institute service identifier : LM-I-016

KCDB ID :
SIM-PR-CR-00000NFX-1

Fibre optics ,
Vacuum wavelength
:
**1250 nm to 1650 nm**

Fibre optic source

Absolute expanded uncertainty
:
**3.9E-2 nm to 6.7E-2 nm**

U = 4.24870E-10 * W^3 - 1.47601E-6 * W^2 + 1.53173E-3 * W - 0.37101 W: Wavelength to be measured in [nm]; U: Expanded uncertainty (k=2) in [nm]

Optical spectrum analyzer

IEC 62129-1

Temperature : (23 ± 2) °C

Humidity : (40 ± 10) %

Approved on 01 October 2022

Institute service identifier : LM-I-010

KCDB ID :
SIM-PR-CR-00000NFV-1

Fibre optics ,
Vacuum wavelength
:
**1510 nm to 1540 nm**

Optical spectrum analyzer

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

Absortion cell

IEC 62129-1

Temperature : (23 ± 2) °C

Humidity : (40 ± 10) %

Approved on 01 October 2022

Institute service identifier : LM-I-011

KCDB ID :
SIM-PR-CR-00000NFW-1

Frequency ,
Frequency
:
**10 MHz**

Local frequency standard

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequency measurement of oscillator

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.1.4

KCDB ID :
SIM-TF-CR-00000O0E-1

Frequency ,
Frequency
:
**1.00E4 Hz to 2.25E8 Hz**

Frequency counter

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequecy measurement of its time base

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.3.1

KCDB ID :
SIM-TF-CR-00000O0I-1

Frequency ,
Frequency
:
**1.00E4 Hz to 1.00E5 Hz**

General frequency source

Relative expanded uncertainty
:
**3.0E-7 Hz/Hz**

Direct frequency measurement

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.2.1

KCDB ID :
SIM-TF-CR-00000O0F-1

Frequency ,
Frequency
:
**1.00E5 Hz to 1.00E6 Hz**

General frequency source

Relative expanded uncertainty
:
**3.0E-8 Hz/Hz**

Direct frequency measurement

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.2.2

KCDB ID :
SIM-TF-CR-00000O0G-1

Fibre optics ,
Optical Length (distance scale offset)
:
**7.5 km to 100 km**

OTDR

Absolute expanded uncertainty
:
**5.0E-2 m to 1.3 m**

Uncertainty table

{"row_1":{"col_1":"Nominal Walelength (nm)","col_2":"Expanded Uncertainty (m) (k=2)"},"row_2":{"col_1":"1310","col_2":"0.050"},"row_3":{"col_1":"1550","col_2":"1.3"}}

Recirculating delay line

IEC 61746-1

Temperature : (23 ± 2) °C

Humidity : (40 ± 10) %

Nominal wavelength : 1310 nm and 1550 nm

Approved on 01 October 2022

Institute service identifier : LM-I-016

KCDB ID :
SIM-PR-CR-00000NG1-1

Frequency ,
Frequency
:
**5 MHz**

Local frequency standard

Relative expanded uncertainty
:
**3.0E-11 Hz/Hz**

Direct frequency measurement of oscillator

Averaging time : 1 s to 86400 s

Gate time : 1 s

Number of measurements : 259200

Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ

Approved on 02 December 2014

Institute service identifier : LAMETRO-ICE/TF 2.1.3

KCDB ID :
SIM-TF-CR-00000O0D-1

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.