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)

Tunisia, DEF-NAT (Laboratoire de Métrologie de la Direction Générale des Transmissions et de l'Informatique)

DC voltage (up to 1100 V) ,
DC voltage sources : intermediate values
:
**10 V to 1000 V**

voltage source, multifunction calibrator

Absolute expanded uncertainty
:
**5.1E-5 V to 6.8E-3 V**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Expanded uncertainty / V"},"row_2":{"col_1":"10 V to 100 V","col_2":"(4.8E-06 <i>U</i> + 1.7E-06)"},"row_3":{"col_1":"100 V to 1000 V","col_2":"(6.8E-06 <i>U</i> + 2.2E-06)"}}

Comparison to a voltage reference via a DC comparator with a resistive divider

Temperature : (23 ± 1)°C

Approved on 22 November 2016

Institute service identifier : DEF-NAT 1.1.3

CMC ID :
AFRIMETS-EM-TN-00000871-1

Time interval ,
Time interval
:
**1.00E-8 s to 1.00E-3 s**

Rise/fall time meter

Absolute expanded uncertainty

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in s"},"row_2":{"col_1":"1.00E-08 s","col_2":"2.7E-09"},"row_3":{"col_1":"1.00E-07 s","col_2":"9.0E-09"},"row_4":{"col_1":"1.00E-06 s","col_2":"7.2E-08"},"row_5":{"col_1":"1.00E-05 s","col_2":"7.0E-07"},"row_6":{"col_1":"1.00E-04 s","col_2":"7.0E-06"},"row_7":{"col_1":"1.00E-03 s","col_2":"7.0E-05"}}

7E-02*t* + 2E-09

*t* rise/fall time in s, values range from 2.7E-09 s to 7E-05 s

The uncertainty is expressed in s

Time interval measurement

Amplitude : >= 1 V in 50 ohms

Slew rate : > 1 V/ns Number of measurements : 10

Approved on 27 March 2017

Institute service identifier : DEF-NAT 3.4.1

CMC ID :
AFRIMETS-TF-TN-000008LU-1

Radio frequency measurements ,
Reflection coefficient (Sii) in coaxials (values in linear terms: magnitude)
:
**2.00E-3 to 0.5**

Passive devices

Absolute expanded uncertainty
:
**6.2E-4 to 3.3E-2**

Uncertainty table

{"row_1":{"col_1":"Γ<sub>x</sub><br>","col_2":"0.4 Ghz to 1 Ghz","col_3":"1 Ghz to 12.4 Ghz<br>"},"row_2":{"col_1":"0.5","col_2":"0.0330","col_3":"0.0330"},"row_3":{"col_1":"0.3","col_2":"0.02","col_3":"0.02"},"row_4":{"col_1":"0.2","col_2":"0.0130","col_3":"0.0140"},"row_5":{"col_1":"0.1","col_2":"0.0065","col_3":"0.0068"},"row_6":{"col_1":"0.05","col_2":"0.0033","col_3":"0.0039"},"row_7":{"col_1":"0.03","col_2":"0.0021","col_3":"0.0029"},"row_8":{"col_1":"0.02<br>","col_2":"0.0015<br>","col_3":"0.0025"},"row_9":{"col_1":"0.01<br>","col_2":"0.0009<br>","col_3":"0.0022"},"row_10":{"col_1":"0.005","col_2":"0.0007<br>","col_3":"0.0021"},"row_11":{"col_1":"0.03","col_2":"0.00064","col_3":"0.0021"},"row_12":{"col_1":"0.002<br>","col_2":"0.00062","col_3":"0.0021"},"row_13":{"col_1":"","col_2":"","col_3":""}}

reflectometer compensate

VM3

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.1.a

CMC ID :
AFRIMETS-EM-TN-00000LJF-1

Frequency ,
Frequency
:
**15 GHz to 20 GHz**

Frequency counter

Absolute expanded uncertainty
:
**3 Hz to 4 Hz**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in Hz"},"row_2":{"col_1":"0.01 Hz","col_2":"3.1E-07"},"row_3":{"col_1":"0.1 Hz","col_2":"3.1E-06"},"row_4":{"col_1":"1 Hz","col_2":"3.1E-06"},"row_5":{"col_1":"10 Hz","col_2":"3.1E-06"},"row_6":{"col_1":"100 Hz","col_2":"3.1E-06"},"row_7":{"col_1":"1000 Hz","col_2":"3.1E-06"},"row_8":{"col_1":"1E+04 Hz","col_2":"3.1E-06"},"row_9":{"col_1":"1E+05 Hz","col_2":"3.1E-06"},"row_10":{"col_1":"1E+06 Hz","col_2":"3.1E-06"},"row_11":{"col_1":"1E+07 Hz","col_2":"3.1E-05"},"row_12":{"col_1":"1E+08 Hz","col_2":"3.1E-04"},"row_13":{"col_1":"1E+09 Hz","col_2":"3.1E-03"},"row_14":{"col_1":"1E+10 Hz","col_2":"3.1E-02"},"row_15":{"col_1":"1.5E+10 Hz","col_2":"4.7E-02"},"row_16":{"col_1":"1.5E+10 Hz","col_2":"3"},"row_17":{"col_1":"1.6E+10 Hz","col_2":"3"},"row_18":{"col_1":"1.7E+10 Hz","col_2":"3"},"row_19":{"col_1":"1.8E+10 Hz","col_2":"4"},"row_20":{"col_1":"1.9E+10 Hz","col_2":"4"},"row_21":{"col_1":"2.0E+10 Hz","col_2":"4"}}

Direct frequency mesurement

Averaging time : 1 s

Number of measurements : 30

Amplitude : >= 0 dBm in 50 ohms

Approved on 27 March 2017

Institute service identifier : DEF-NAT 2.3.1

CMC ID :
AFRIMETS-TF-TN-000008LT-1

Radio frequency measurements ,
RF attenuation, in coaxials (values in dB)
:
**0 dB to 80 dB**

passive device (piston attenuator)

Absolute expanded uncertainty
:
**2.6E-2 dB to 0.2 dB**

Uncertainty table

{"row_1":{"col_1":"Attenuation A<sub>x <strong>(*)</strong></sub><br>","col_2":"Expanded uncertainty (dB)"},"row_2":{"col_1":"0<br>","col_2":"0.026"},"row_3":{"col_1":"1","col_2":"0.028"},"row_4":{"col_1":"2","col_2":"0.028"},"row_5":{"col_1":"3","col_2":"0.028"},"row_6":{"col_1":"4","col_2":"0.028"},"row_7":{"col_1":"5","col_2":"0.028"},"row_8":{"col_1":"6","col_2":"0.029"},"row_9":{"col_1":"7","col_2":"0.029"},"row_10":{"col_1":"8","col_2":"0.029<br>"},"row_11":{"col_1":"9","col_2":"0.029"},"row_12":{"col_1":"10","col_2":"0.029"},"row_13":{"col_1":"15","col_2":"0.030"},"row_14":{"col_1":"20","col_2":"0.032"},"row_15":{"col_1":"25","col_2":"0.035<br>"},"row_16":{"col_1":"30<br>","col_2":"0.037"},"row_17":{"col_1":"35<br>","col_2":"0.039"},"row_18":{"col_1":"40<br>","col_2":"0.042"},"row_19":{"col_1":"45","col_2":"0.045"},"row_20":{"col_1":"50","col_2":"0.18"},"row_21":{"col_1":"55","col_2":"0.18"},"row_22":{"col_1":"60<br>","col_2":"0.19"},"row_23":{"col_1":"65<br>","col_2":"0.19"},"row_24":{"col_1":"70","col_2":"0.19"},"row_25":{"col_1":"75","col_2":"0.19"},"row_26":{"col_1":"80","col_2":"0.20"}}

The expanded uncertainties given in this table are expressed in dB

-Temperature : (23±1)C°

-Relative humidity:Between 30% and 50%

**(*) Measurement frequency : fixed at 30 MHz.**

-Temperature : (23±1)C°

-Relative humidity:Between 30% and 50%

Direct method

VM3 (evanescent wave attenuator)

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.3.c

CMC ID :
AFRIMETS-EM-TN-00000LJR-1

Radio frequency measurements ,
Scalar RF attenuation: in waveguide, magnitude
:
**0 dB to 80 dB**

passive devices(rotary vane attenuator)

Absolute expanded uncertainty
:
**7.5E-2 dB to 0.28 dB**

Uncertainty table

{"row_1":{"col_1":"Frequency(GHz)<br>","col_2":"measurement range (dB)<br>","col_3":"Expanded uncertainty (dB)<br>"},"row_2":{"col_1":"8.2-12.4 GHz","col_2":"[0-10]","col_3":"0.075"},"row_3":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-15]","col_3":"0.076"},"row_4":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-20]","col_3":"0.077"},"row_5":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-35]<br>","col_3":"0.078"},"row_6":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-40]<br>","col_3":"0.08<br>"},"row_7":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-45]<br>","col_3":"0.082"},"row_8":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-50]<br>","col_3":"0.22<br>"},"row_9":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-55]","col_3":"0.22"},"row_10":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-60]","col_3":"0.22<br>"},"row_11":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-65]","col_3":"0.22"},"row_12":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-70]","col_3":"0.22"},"row_13":{"col_1":"8.2-12.4 GHz<br>","col_2":"[0-75]","col_3":"0.22"},"row_14":{"col_1":"8.2-12.4 GHz","col_2":"[0-80]","col_3":"0.28"},"row_15":{"col_1":"","col_2":"","col_3":""},"row_16":{"col_1":"","col_2":"","col_3":""}}

The expanded uncertainties given are expressed in dB

-Temperature:(23±1)C°

-Relative humidity: Between 30% and 50%

Γ_{x < 0.07}

-Temperature:(23±1)C°

-Relative humidity: Between 30% and 50%

Γ

subtitution at 30 MHz

VM3 (evanescent wave attenuator)

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.4

CMC ID :
AFRIMETS-EM-TN-00000LJS-1

Frequency ,
Frequency
:
**1.00E7 Hz to 1.50E10 Hz**

Frequency counter

Absolute expanded uncertainty
:
**3.1E-5 Hz to 4.7E-2 Hz**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in Hz"},"row_2":{"col_1":"0.01 Hz","col_2":"3.1E-07"},"row_3":{"col_1":"0.1 Hz","col_2":"3.1E-06"},"row_4":{"col_1":"1 Hz","col_2":"3.1E-06"},"row_5":{"col_1":"10 Hz","col_2":"3.1E-06"},"row_6":{"col_1":"100 Hz","col_2":"3.1E-06"},"row_7":{"col_1":"1000 Hz","col_2":"3.1E-06"},"row_8":{"col_1":"1E+04 Hz","col_2":"3.1E-06"},"row_9":{"col_1":"1E+05 Hz","col_2":"3.1E-06"},"row_10":{"col_1":"1E+06 Hz","col_2":"3.1E-06"},"row_11":{"col_1":"1E+07 Hz","col_2":"3.1E-05"},"row_12":{"col_1":"1E+08 Hz","col_2":"3.1E-04"},"row_13":{"col_1":"1E+09 Hz","col_2":"3.1E-03"},"row_14":{"col_1":"1E+10 Hz","col_2":"3.1E-02"},"row_15":{"col_1":"1.5E+10 Hz","col_2":"4.7E-02"},"row_16":{"col_1":"1.5E+10 Hz","col_2":"3"},"row_17":{"col_1":"1.6E+10 Hz","col_2":"3"},"row_18":{"col_1":"1.7E+10 Hz","col_2":"3"},"row_19":{"col_1":"1.8E+10 Hz","col_2":"4"},"row_20":{"col_1":"1.9E+10 Hz","col_2":"4"},"row_21":{"col_1":"2.0E+10 Hz","col_2":"4"}}

Direct frequency mesurement

Averaging time : 100 s

Number of measurements : 30

Amplitude : >= 0 dBm in 50 ohms

Approved on 27 March 2017

Institute service identifier : DEF-NAT 2.3.1

CMC ID :
AFRIMETS-TF-TN-000008LS-1

Time interval ,
Time interval
:
**1.00E-9 s to 1.00E5 s**

Time difference meter

Absolute expanded uncertainty

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in s"},"row_2":{"col_1":"1.00E-09 s","col_2":"2.00E-09"},"row_3":{"col_1":"1.00E-08 s","col_2":"2.00E-09"},"row_4":{"col_1":"1.00E-07 s","col_2":"2.00E-09"},"row_5":{"col_1":"1.00E-06 s","col_2":"2.00E-09"},"row_6":{"col_1":"1.00E-05 s","col_2":"2.00E-09"},"row_7":{"col_1":"1.00E-04 s","col_2":"2.00E-09"},"row_8":{"col_1":"1.00E-03 s","col_2":"2.00E-09"},"row_9":{"col_1":"1.00E-02 s","col_2":"2.00E-09"},"row_10":{"col_1":"1.00E-01 s","col_2":"2.00E-09"},"row_11":{"col_1":"1 s","col_2":"2.02E-09"},"row_12":{"col_1":"10 s","col_2":"2.20E-09"},"row_13":{"col_1":"100 s","col_2":"4.00E-09"},"row_14":{"col_1":"1000 s","col_2":"2.20E-08"},"row_15":{"col_1":"10000 s","col_2":"2.02E-07"},"row_16":{"col_1":"100000 s","col_2":"2.00E-06"}}

2E-11*t* + 2E-09

*t* time interval in s, values range from 2E-09 s to 2E-06 s

The uncertainty is expressed in s

Time interval measurement

Amplitude : >= 1 V in 50 ohms

Slew rate : > 1 V/ns Number of measurements : 10

Approved on 27 March 2017

Institute service identifier : DEF-NAT 3.4.3

CMC ID :
AFRIMETS-TF-TN-000008LW-1

Time interval ,
Time interval
:
**1.00E-8 s to 1000 s**

Pulse width meter

Absolute expanded uncertainty

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in s"},"row_2":{"col_1":"1.00E-08 s","col_2":"2.00E-09"},"row_3":{"col_1":"1.00E-07 s","col_2":"2.00E-09"},"row_4":{"col_1":"1.00E-06 s","col_2":"2.00E-09"},"row_5":{"col_1":"1.00E-05 s","col_2":"2.00E-09"},"row_6":{"col_1":"1.00E-04 s","col_2":"2.00E-09"},"row_7":{"col_1":"1.00E-03 s","col_2":"2.00E-09"},"row_8":{"col_1":"1.00E-02 s","col_2":"2.00E-09"},"row_9":{"col_1":"1.00E-01 s","col_2":"2.00E-09"},"row_10":{"col_1":"1 s","col_2":"2.02E-09"},"row_11":{"col_1":"10 s","col_2":"2.20E-09"},"row_12":{"col_1":"100 s","col_2":"4.00E-09"},"row_13":{"col_1":"1000 s","col_2":"2.20E-08"}}

2E-11*t* + 2E-09

*t* pulse width in s, values range from 2E-09 s to 2.2E-08 s

The uncertainty is expressed in s

Time interval measurement

Amplitude : >= 1 V in 50 hms

Slew rate : > 1 V/ns Number of measurements : 10

Approved on 27 March 2017

Institute service identifier : DEF-NAT 3.4.2

CMC ID :
AFRIMETS-TF-TN-000008LV-1

Radio frequency measurements ,
Scalar RF attenuation in coaxial line
:
**0 dB to 90 dB**

Passive devices(variable attenuator)

Absolute expanded uncertainty
:
**6.0E-2 dB to 0.38 dB**

Uncertainty table

{"row_1":{"col_1":"Frequency (GHz)<br>","col_2":"Measured range (dB)","col_3":"Expanded uncertainty (dB)<br>"},"row_2":{"col_1":"0.01-12.4 GHz<br>","col_2":"[0-10 dB]","col_3":"(0.06+0.58<em> Γx</em>)"},"row_3":{"col_1":"0.01-12.4 GHz","col_2":"[0-20 dB]","col_3":"(0.06+0.57 <em>Γx</em>)"},"row_4":{"col_1":"0.01-12.4 GHz","col_2":"[0-30 dB]","col_3":"(0.06+0.57 <em>Γx</em>)<br>"},"row_5":{"col_1":"0.01-12.4 GHz","col_2":"[0-40 dB]","col_3":"(0.06+0.56 <em>Γx</em>)"},"row_6":{"col_1":"0.01-12.4 GHz","col_2":"[0-50 dB]<br>","col_3":"[0.29+0.25 <em>Γx</em>]"},"row_7":{"col_1":"0.01-12.4 GHz<br>","col_2":"[0-60 dB]<br>","col_3":"[0.29+0.25 <em>Γx</em>]<br>"},"row_8":{"col_1":"0.01-12.4 GHz","col_2":"[0-70 dB]<br>","col_3":"[0.29+0.25 <em>Γx</em>]"},"row_9":{"col_1":"0.01-12.4 GHz","col_2":"[0-80 dB]","col_3":"[0.34+0.22 <em>Γx</em>]"},"row_10":{"col_1":"0.01-12.4 GHz<br>","col_2":"[0-90 dB]","col_3":"[0.34+0.22 <em>Γx</em>]"}}

The expanded uncertainties given are expressed in dB

-Temperature: (23±1)C°

-Relative humidity:Between 30% and 50%

-Γx<= 0.3

-Temperature: (23±1)C°

-Relative humidity:Between 30% and 50%

-Γx<= 0.3

subtitution at 30MHz

VM3

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.3.b

CMC ID :
AFRIMETS-EM-TN-00000LJN-1

Radio frequency measurements ,
Reflection coefficient
:
**1.00E-3 to 0.5**

Passive devices

Absolute expanded uncertainty
:
**6.1E-3 to 1.9E-2**

Uncertainty table

{"row_1":{"col_1":"Γ<sub>x</sub>","col_2":"Expanded uncertainty"},"row_2":{"col_1":"0.5","col_2":"1.9E-2"},"row_3":{"col_1":"0.3","col_2":"1.3E-2"},"row_4":{"col_1":"0.2","col_2":"1.1E-2"},"row_5":{"col_1":"0.1","col_2":"9E-3"},"row_6":{"col_1":"0.05<br>","col_2":"6.7E-3"},"row_7":{"col_1":"0.03<br>","col_2":"6.4E-3"},"row_8":{"col_1":"0.02<br>","col_2":"6.2E-3"},"row_9":{"col_1":"0.01<br>","col_2":"6.1E-3"},"row_10":{"col_1":"0.005<br>","col_2":"6.1E-3"},"row_11":{"col_1":"0.003<br>","col_2":"6.1E-3"},"row_12":{"col_1":"0.002<br>","col_2":"6.1E-1"},"row_13":{"col_1":"0.001<br>","col_2":"6.1E-3"}}

Measurement Frequency from 10 MHz to 100 MHz

ambiant condition:

- T° (23+/-1)°C,

- Humidity between 30% and 50%

ambiant condition:

- T° (23+/-1)°C,

- Humidity between 30% and 50%

Spectrum analyser

VM3

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.1.b

CMC ID :
AFRIMETS-EM-TN-00000LSX-1

DC resistance ,
DC resistance sources: low values
:
**0.1 Ω to 1 Ω**

Fixed resistor & resistance box

Relative expanded uncertainty
:
**3 µΩ/Ω to 3.3 µΩ/Ω**

Uncertainty table

{"row_1":{"col_1":"0.1Ω<br>","col_2":"3.3"},"row_2":{"col_1":"1Ω","col_2":"3.0"},"row_3":{"col_1":"0.1 Ω to 1 Ω","col_2":"3.3<br>"}}

comparison to reference resistance with DC resistance bridge

standard resistance LN4210

Approved on 02 May 2023

Institute service identifier : Def-Nat 2.1.1

CMC ID :
AFRIMETS-EM-TN-00000O01-1

DC resistance ,
DC Resistance (Intermediate values from 1 ohm up to 10 ohm)
:
**1 Ω to 10 Ω**

Fixed resistor & resistance box

Relative expanded uncertainty
:
**3 µΩ/Ω to 3.8 µΩ/Ω**

Uncertainty table

{"row_1":{"col_1":"1 Ω<br>","col_2":"3.0"},"row_2":{"col_1":"10 Ω","col_2":"3.8"},"row_3":{"col_1":"1 Ω to 10 Ω","col_2":"3.8"}}

comparison to reference resistance with DC resistance bridge

LN 4210 (1 Ohm)

Approved on 19 February 2023

Institute service identifier : Def-Nat 2.1.2

CMC ID :
AFRIMETS-EM-TN-00000O0W-1

Frequency ,
Frequency
:
**0.01 Hz to 1.00E7 Hz**

Frequency counter

Absolute expanded uncertainty
:
**3.1E-7 Hz to 3.1E-5 Hz**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Absolute expanded uncertainty expressed in Hz"},"row_2":{"col_1":"0.01 Hz","col_2":"3.1E-07"},"row_3":{"col_1":"0.1 Hz","col_2":"3.1E-06"},"row_4":{"col_1":"1 Hz","col_2":"3.1E-06"},"row_5":{"col_1":"10 Hz","col_2":"3.1E-06"},"row_6":{"col_1":"100 Hz","col_2":"3.1E-06"},"row_7":{"col_1":"1000 Hz","col_2":"3.1E-06"},"row_8":{"col_1":"1E+04 Hz","col_2":"3.1E-06"},"row_9":{"col_1":"1E+05 Hz","col_2":"3.1E-06"},"row_10":{"col_1":"1E+06 Hz","col_2":"3.1E-06"},"row_11":{"col_1":"1E+07 Hz","col_2":"3.1E-05"},"row_12":{"col_1":"1E+08 Hz","col_2":"3.1E-04"},"row_13":{"col_1":"1E+09 Hz","col_2":"3.1E-03"},"row_14":{"col_1":"1E+10 Hz","col_2":"3.1E-02"},"row_15":{"col_1":"1.5E+10 Hz","col_2":"4.7E-02"},"row_16":{"col_1":"1.5E+10 Hz","col_2":"3"},"row_17":{"col_1":"1.6E+10 Hz","col_2":"3"},"row_18":{"col_1":"1.7E+10 Hz","col_2":"3"},"row_19":{"col_1":"1.8E+10 Hz","col_2":"4"},"row_20":{"col_1":"1.9E+10 Hz","col_2":"4"},"row_21":{"col_1":"2.0E+10 Hz","col_2":"4"}}

Direct frequency mesurement

Averaging time : 100 s

Number of measurements : 30

Amplitude : >= 1 Vrms in 50 ohms

Approved on 27 March 2017

Institute service identifier : DEF-NAT 2.3.1

CMC ID :
AFRIMETS-TF-TN-000008LR-1

DC voltage (up to 1100 V) ,
DC voltage sources: low value ranges
:
**1.00E-5 V to 10 V**

voltage source, multifunction calibrator

Absolute expanded uncertainty
:
**1.7E-6 V to 3.8E-5 V**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Expanded uncertainty / V"},"row_2":{"col_1":"0.01 mV to 200 mV","col_2":"(1.2E-06 <i>U</i> +1.7E-06)"},"row_3":{"col_1":"0.2 V to 2 V","col_2":"(1.2E-06 <i>U</i> + 1.8E-06)"},"row_4":{"col_1":"2 V to 10 V","col_2":"(3.6E-06 <i>U</i> + 1.7E-06)"}}
*U* is given in V

Comparison to a voltage reference via a DC comparator with a resistive divider

Temperature : (23 ± 1)°C

Approved on 22 November 2016

Institute service identifier : DEF-NAT 1.1.2

CMC ID :
AFRIMETS-EM-TN-00000870-1

Radio frequency measurements ,
RF attenuation, in coaxials (values in dB)
:
**0 dB to 90 dB**

passive devices: fixed attenuator

Absolute expanded uncertainty
:
**7.0E-2 dB to 0.32 dB**

Uncertainty table

{"row_1":{"col_1":"frequency (GHz)<br>","col_2":"measurement range(dB)<br>\nrange:[0-90dB]","col_3":"expanded uncertainty(dB)"},"row_2":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"0","col_3":"(0.07+0.29 <em>Γx</em>)"},"row_3":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"3","col_3":"(0.07+0.30<em contenteditable=\"true\"> Γx</em>)"},"row_4":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"6","col_3":"(0.07+0.29 <em>Γx)</em>"},"row_5":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"10","col_3":"(0.07+0.29 <em>Γx</em>)"},"row_6":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"20","col_3":"(0.07+0.29 <em>Γx</em>)"},"row_7":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"30","col_3":"(0.07+0.29 <em>Γx</em>)"},"row_8":{"col_1":"[0.01-12.4 GHz]","col_2":"40","col_3":"(0.07+0.28 <em contenteditable=\"true\">Γx</em>)<br>"},"row_9":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"50","col_3":"(0.23+0.12 <em>Γx</em>)"},"row_10":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"60","col_3":"(0.23+0.12<em> Γx</em>)"},"row_11":{"col_1":"[0.01-12.4 GHz]<br>","col_2":"70","col_3":"(0.23+0.12 <em>Γx</em>)<br>"},"row_12":{"col_1":"[0.01-12.4 GHz]","col_2":"80","col_3":"(0.24+0.35 <em>Γx</em>)"},"row_13":{"col_1":"[0.01-12.4 GHz]","col_2":"90","col_3":"(0.25+0.35 <em>Γx</em>)"}}

The expanded uncertainties given in this table are expressed in dB

Γx<=0.2

connetctor type N

measured temperature:(23±1) C°

measured relative humidity: Between 30% and 50%

Γx<=0.2

connetctor type N

measured temperature:(23±1) C°

measured relative humidity: Between 30% and 50%

(0.07+0.29Γ_{X}) to (0.25+0.35Γx) the expanded uncertainties given are expressed in dB

Γx<=0.2

Γx<=0.2

subtitution at 30 MHz

VM3 (evanescent wave attenuator)

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.3.a

CMC ID :
AFRIMETS-EM-TN-00000LJM-1

Radio frequency measurements ,
Reflection coefficient: in waveguide magnitude
:
**1.00E-3 to 0.5**

Passive devices

Absolute expanded uncertainty
:
**1.1E-3 to 3.4E-2**

Uncertainty table

{"row_1":{"col_1":"Γ<sub>x</sub>","col_2":"8.2 GHz to 12.4 GHz"},"row_2":{"col_1":"0.5","col_2":"0.034"},"row_3":{"col_1":"0.3","col_2":"0.021"},"row_4":{"col_1":"0.2<br>","col_2":"0.014"},"row_5":{"col_1":"0.1","col_2":"0.007"},"row_6":{"col_1":"0.05<br>","col_2":"0.0036<br>"},"row_7":{"col_1":"0.03","col_2":"0.0023"},"row_8":{"col_1":"0.02<br>","col_2":"0.0017"},"row_9":{"col_1":"0.01<br>","col_2":"0.0013"},"row_10":{"col_1":"0.005<br>","col_2":"0.0011<br>"},"row_11":{"col_1":"0.003","col_2":"0.0011"},"row_12":{"col_1":"0.002<br>","col_2":"0.0011"},"row_13":{"col_1":"0.001<br>","col_2":"0.0011"}}

the expanded uncertainties given are dimensionless

measured temperature :(23±1) C°

measured relative humidity : Between 30% and 50%

measured temperature :(23±1) C°

measured relative humidity : Between 30% and 50%

reflectometer compensate

VM3(evanescent wave attenuator)

Approved on 15 June 2021

Institute service identifier : DEFNAT 11.2.2

CMC ID :
AFRIMETS-EM-TN-00000LJL-1

DC voltage (up to 1100 V) ,
DC voltage meters: intermediate values
:
**1.00E-3 V to 1000 V**

DC voltmeter, multimeter, multifunction transfer standard

Absolute expanded uncertainty
:
**1.7E-6 V to 6.8E-3 V**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Expanded uncertainty / V"},"row_2":{"col_1":"1 mV to 200 mV","col_2":"(1.2E-06 <i>U</i>+ 1.7E-06)"},"row_3":{"col_1":"0.2 V to 2 V","col_2":"(1.2E-06 <i>U</i> + 1.8E-06)"},"row_4":{"col_1":"2 V to 10 V","col_2":"(3.6E-06 <i>U</i> + 1.7E-06)"},"row_5":{"col_1":"10 V to 100 V","col_2":"(4.8E-06 <i>U</i> + 1.7E-06)"},"row_6":{"col_1":"100 V to 1000 V","col_2":"(6.8E-06 <i>U</i> + 2.2E-06)"}}
*U* is given in V

Direct measurement via a standard source

Temperature : (23 ± 1)°C

Approved on 22 November 2016

Institute service identifier : DEF-NAT 1.2.2

CMC ID :
AFRIMETS-EM-TN-00000872-1

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

Standard cell, solid state voltage standard

Absolute expanded uncertainty
:
**0.1 µV to 0.5 µV**

Uncertainty table

{"row_1":{"col_1":"","col_2":"Expanded uncertainty / µV"},"row_2":{"col_1":"1 V","col_2":"0.1"},"row_3":{"col_1":"1.018 V","col_2":"0.1"},"row_4":{"col_1":"10 V","col_2":"0.5"}}

Direct comparison with JAVS, Differential method

Temperature : (23 ± 1)°C

Approved on 22 November 2016

Institute service identifier : DEF-NAT 1.1.1

CMC ID :
AFRIMETS-EM-TN-0000086Z-1

Frequency ,
Frequency
:
**1.00E7 Hz to 1.50E10 Hz**

General frequency source

Absolute expanded uncertainty
:
**3.1E-5 Hz to 4.7E-2 Hz**

Uncertainty table

Direct frequency mesurement

Averaging time : 100 s

Number of measurements : 30

Amplitude : >= 0 dBm in 50 ohms

Approved on 27 March 2017

Institute service identifier : DEF-NAT 2.2.1.a

CMC ID :
AFRIMETS-TF-TN-000008LP-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.

the expanded uncertainties given are dimensionless

measured temperature :(23±1)C°

measured relative humidity :Between 30% and 50%