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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)
Kenya, KEBS (Kenya Bureau of Standards)
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Mass fraction in mg/kg |
Absolute expanded uncertainty in mg/kg |
Mass fraction in |
Absolute expanded uncertainty in |
| brown rice |
cadmium |
0.2 to 0.5 |
7.0E-2 to 0.12 |
|
|
-
Mechanism for measurement service delivery :
Provision of reference value for client samples
-
Microwave Plasma Atomic Emission Spectrometry used to determine cadmium mass fraction in rice after microwave digestion of the sample
-
Approved on
28 June 2016
-
Institute service identifier : 52-CCQM
-
CMC ID :
AFRIMETS-QM-KE-000000UX-1
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Mass fraction in mg/g |
Absolute expanded uncertainty in % |
Mass fraction in |
Absolute expanded uncertainty in |
| aqueous media |
ethanol |
0.2 to 25 |
1.9 to 7.2 |
|
|
-
Mechanism for measurement service delivery :
Reference measurement
-
Approved on
13 June 2013
-
Institute service identifier : IPS-Q11-04-2
-
CMC ID :
AFRIMETS-QM-KE-000000UW-1
Force ,
Force: tension and compression
:
100 kN to 1000 kN
Force measuring device
Relative expanded uncertainty
:
5.0E-2 %
Lever Amplification Force Standard Machine
ISO 376
Measurement according to ISO 376
Approved on 02 February 2022
CMC ID :
AFRIMETS-M-KE-00000MQP-1
Force ,
Force: tension and compression
:
1 kN to 10 kN
Force measuring device
Relative expanded uncertainty
:
5.0E-2 %
Lever Amplification Force Standard Machine
ISO 376
Measurement according to ISO 376
Approved on 02 February 2022
Institute service identifier : KEBS/CMC/18
CMC ID :
AFRIMETS-M-KE-00000MQJ-1
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
-10 °C to 0 °C
Platinum resistance thermometers (PRT)
Absolute expanded uncertainty
:
5.3E-2 °C to 8.2E-2 °C
Uncertainty table
{"row_1":{"col_1":"<strong>Source of uncertainty </strong>","col_2":"<strong>Value </strong>","col_3":"<strong>Unit </strong>","col_4":"<strong contenteditable=\"true\">Probability distribution </strong>","col_5":"<strong>Divisor </strong>","col_6":"<strong contenteditable=\"true\">Sensitivity (°C / unit) </strong>","col_7":"<strong contenteditable=\"true\">Uncertainty contribution (k=1) (°C) </strong>","col_8":"<strong contenteditable=\"true\">Degrees of freedom</strong>"},"row_2":{"col_1":"<strong>Calibration of reference thermometer </strong>","col_2":"1.50E-02","col_3":"ºC","col_4":"Normal ","col_5":"2","col_6":"1","col_7":"0.0075","col_8":"20"},"row_3":{"col_1":"<strong>Drift of reference thermometer since last cal </strong>","col_2":"6.96E-04","col_3":"Ω ","col_4":"Rectangular ","col_5":"1.73205081","col_6":"9.8","col_7":"0.0039","col_8":"∞"},"row_4":{"col_1":"<strong contenteditable=\"true\">Stability of R(0.01°C) or R(0°C): ref thermometer (if it is a PRT) </strong>","col_2":"0.00173","col_3":"Ω ","col_4":"Rectangular","col_5":"1.73205081","col_6":"9.8","col_7":"0.0098","col_8":"50"},"row_5":{"col_1":"<strong contenteditable=\"true\">Uncert of ref temperature (WTP or ice point): ref thermometer </strong>","col_2":"0.02","col_3":"ºC ","col_4":"Rectangular ","col_5":"1.73205081","col_6":"1","col_7":"0.0115","col_8":"100"},"row_6":{"col_1":"<strong>Uncert of electrical measuring instrument: ref thermometer </strong>","col_2":"0.00148157","col_3":"Ω ","col_4":"Normal","col_5":"2","col_6":"9.8","col_7":"0.0073","col_8":"20"},"row_7":{"col_1":"<strong>Temp gradient in bath/furnace (incl stem conduction error) </strong>","col_2":"0.00055","col_3":"ºC ","col_4":"Rectangular","col_5":"1.73205081","col_6":"1","col_7":"0.0003","col_8":"20"},"row_8":{"col_1":"<strong>Stability of R(0.01°C) or R(0°C): UUT </strong>","col_2":"0.00148","col_3":"Ω ","col_4":"Rectangular","col_5":"1.73205081","col_6":"2.5","col_7":"0.0021","col_8":"50"},"row_9":{"col_1":"<strong>Uncert of ref temperature (WTP or ice point): UUT </strong>","col_2":"0.02","col_3":"ºC ","col_4":"Rectangular","col_5":"1.73205081","col_6":"1","col_7":"0.0115","col_8":"50"},"row_10":{"col_1":"<strong contenteditable=\"true\">Uncert of electrical measuring instrument: UUT </strong>","col_2":"0.025","col_3":"ºC ","col_4":"Rectangular","col_5":"1.73205081","col_6":"1","col_7":"0.0144","col_8":"∞"},"row_11":{"col_1":"<strong contenteditable=\"true\">Repeatability </strong>","col_2":"0.00E+00","col_3":"Ω ","col_4":"Normal","col_5":"1","col_6":"2.5","col_7":"0","col_8":"20"},"row_12":{"col_1":"<strong>Self-heating: UUT </strong>","col_2":"0.00032","col_3":"Ω ","col_4":"Normal","col_5":"1.73205081","col_6":"2.5","col_7":"0.0005","col_8":"50"},"row_13":{"col_1":"<strong>Combined uncertainty (k=1): </strong>","col_2":"","col_3":"","col_4":"<br>","col_5":"","col_6":"","col_7":"<strong>0.0265</strong>","col_8":""},"row_14":{"col_1":"<strong contenteditable=\"true\">Expanded uncertainty (k=2) (°C): </strong>","col_2":"<br>","col_3":"<br>","col_4":"<br>","col_5":"","col_6":"","col_7":"<strong>0.0529</strong>","col_8":""}}
-80 °C to 5 °C: alcohol bath, 5 °C to 70 °C: water bath, 70 °C to 230 °C: oil bath
Approved on 10 December 2024
CMC ID :
AFRIMETS-T-KE-00000N90-1
Force ,
Force: tension and compression
:
5 kN to 50 kN
Force measuring device
Relative expanded uncertainty
:
0.1 %
Lever Amplification Force Standard Machine
Measurement according to ISO 376
Approved on 23 July 2021
CMC ID :
AFRIMETS-M-KE-00000MQL-2
DC resistance ,
DC resistance: DC resistance standards and sources: intermediate values
:
1 Ω to 1.00E4 Ω
742A Standard resistors, 4 terminal, air immersion
Relative expanded uncertainty
:
1.5 µΩ/Ω to 2 µΩ/Ω
Uncertainty table
{"row_1":{"col_1":"KEBS -2.1.2","col_2":"<br>"},"row_2":{"col_1":"","col_2":"Relative Uncertainty (µΩ/Ω)"},"row_3":{"col_1":"1 Ω to 10 Ω","col_2":"2"},"row_4":{"col_1":"10 Ω to 100 Ω","col_2":"2"},"row_5":{"col_1":"100 Ω to 1 kΩ","col_2":"1.5"},"row_6":{"col_1":"1 kΩ to 10 kΩ","col_2":"1.5"}}
Guideline 6625A Resistance Bridge(current comparator) and 742A standard resistor
Temperature : 23 ± 2 °C
Relative Humidity : 50 ± 15 %R/H
Atmospheric Pressure : 840 ± 10 hPa
Approved on 04 December 2023
Institute service identifier : KEBS
CMC ID :
AFRIMETS-EM-KE-00000P5R-1
Mass ,
Mass
:
5 g
Mass standard
Absolute expanded uncertainty
:
6 µg
Comparison in air
Approved on 16 May 2024
CMC ID :
AFRIMETS-M-KE-00000PBR-1
Various dimensional ,
Hand instruments
:
0 mm to 300 mm
Calliper: error of indicated size L
Absolute expanded uncertainty
:
1.2E1 µm
Comparison with gauge blocks
ISO 13385-1 (2019)
Resolution : 0.02 mm
Approved on 19 May 2025
CMC ID :
AFRIMETS-L-KE-00000PTR-1
Acceleration measuring instrument ,
Frequency response (modulus)
:
0.1 m/s2 to 200 m/s2
Acceleration measuring instrument
Relative expanded uncertainty
:
2 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : > 5 kHz to 7.5 kHz
Approved on 25 September 2018
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4G-2
Acceleration measuring instrument ,
Frequency response (modulus)
:
0.1 m/s2 to 200 m/s2
Acceleration measuring instrument
Relative expanded uncertainty
:
2.2 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : > 7.5 kHz to 10 kHz
Approved on 25 September 2018
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4H-2
Acceleration measuring chain / accelerometer ,
Voltage sensitivity (modulus)
Acceleration measuring chain/accelerometer
Relative expanded uncertainty
:
2 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : > 5 kHz to 7.5 kHz
Approved on 25 September 2018
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4O-2
Acceleration measuring chain / accelerometer ,
Charge sensitivity (modulus)
Acceleration measuring chain /accelerometer
Relative expanded uncertainty
:
1 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : 10 Hz to 1 kHz
Approved on 30 June 2016
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4I-2
DC voltage (up to 1100 V) ,
DC voltage sources, single values
:
1.018 V to 10 V
DC Voltage Standard
Relative expanded uncertainty
:
0.4 µV/V to 0.8 µV/V
Uncertainty table
{"row_1":{"col_1":"Voltage Value (V)","col_2":"Expanded Uncertainty (µV/V)"},"row_2":{"col_1":"1.018","col_2":"0.8"},"row_3":{"col_1":"10","col_2":"0.4"}}
Direct Comparison with a group of solid state voltage standards
New entry
Approved on 12 April 2021
CMC ID :
AFRIMETS-EM-KE-00000MUX-1
Sound calibrators ,
Sound pressure level
:
90 dB (reference: 20 µPa) to 140 dB (reference: 20 µPa)
Sound calibrator (single frequency 1 kHz)
Absolute expanded uncertainty
:
7.0E-2 dB
Microphone method / Insert voltage technique
IEC 60942:2017
CMC applies to single frequency electro-acoustic sound calibrators and does not extend to pistonphones.
Approved on 29 September 2023
Institute service identifier : A2.3.1
CMC ID :
AFRIMETS-AUV-KE-00000P1E-1
Force ,
Force: tension and compression
:
50 kN to 500 kN
Force measuring device
Relative expanded uncertainty
:
5.0E-2 %
Lever Amplification Force Standard Machine
ISO 376
Approved on 23 July 2021
CMC ID :
AFRIMETS-M-KE-00000MQO-2
DC resistance ,
DC resistance standards and sources: standards for high current
:
0.1 mΩ to 1000 mΩ
Current shunts, low resistance standards
Relative expanded uncertainty
:
4 µΩ/Ω to 5 µΩ/Ω
Uncertainty table
{"row_1":{"col_1":"KEBS -2.1.4","col_2":"<br>","col_3":""},"row_2":{"col_1":"Nonimal Value","col_2":"Test Current","col_3":"Relative Uncertainty (µΩ/Ω)"},"row_3":{"col_1":"100 µΩ","col_2":"300 A","col_3":"5"},"row_4":{"col_1":"1 mΩ","col_2":"100 A","col_3":"4"},"row_5":{"col_1":"10 mΩ","col_2":"15 A","col_3":"4"},"row_6":{"col_1":"100 mΩ","col_2":"1 A","col_3":"4"},"row_7":{"col_1":"1 000 mΩ","col_2":"0.1 A","col_3":"4"}}
Voltage drop across shunt and low resistance standard
Temperature : (23 ± 2) °C
Relative Humidity : (50 ± 15) %
Atmospheric Pressure : (840 ± 10) hPa
Approved on 17 August 2025
Institute service identifier : KEBS DC Resistance
CMC ID :
AFRIMETS-EM-KE-00000P5X-1
Mass ,
Mass
:
500 mg
Mass standard
Absolute expanded uncertainty
:
2 µg
Comparison in air
Approved on 16 May 2024
CMC ID :
AFRIMETS-M-KE-00000PBQ-1
Acceleration measuring instrument ,
Frequency response (modulus)
:
0.1 m/s2 to 200 m/s2
Acceleration measuring instrument
Relative expanded uncertainty
:
1.5 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : >1 kHz to 5 kHz
Approved on 30 June 2016
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4F-2
Acceleration measuring chain / accelerometer ,
Charge sensitivity (modulus)
Acceleration measuring chain/accelerometer
Relative expanded uncertainty
:
2.2 %
Comparison to a reference accelerometer
ISO 16063-21
Frequency : > 7.5 kHz to 10 kHz
Approved on 25 September 2018
Institute service identifier : KEBS/A2.6
CMC ID :
AFRIMETS-AUV-KE-00000C4L-2
