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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)
Belgium, SMD (Service de la Métrologie Belge)
Items for defining ITS-90 , Temperature : -189 °C to 0 °C
Long stem SPRT
Absolute expanded uncertainty : 1.4 mK
Measurement at fixed points
Ambient temperature : (22 ± 1) °C
Three zone furnace
Approved on 17 January 2013
Institute service identifier : SMD/3.1
Items for defining ITS-90 , Temperature : 0 °C to 231 °C
Long stem SPRT
Absolute expanded uncertainty : 2.1 mK
Measurement at fixed points
Ambient temperature : (22 ± 1) °C
Three zone furnace
Approved on 17 January 2013
Institute service identifier : SMD/3.5
Items for defining ITS-90 , Temperature : -38 °C to 29 °C
Long stem SPRT
Absolute expanded uncertainty : 0.8 mK
Measurement at fixed points
Ambient temperature : (22 ± 1) °C
Three zone furnace
Approved on 17 January 2013
Institute service identifier : SMD/3.2
Items for defining ITS-90 , Temperature : -38.8344 °C
Long stem SPRT
Absolute expanded uncertainty : 0.7 mK
Measurement at mercury point
Temperature controlled bath
Approved on 20 May 2010
Institute service identifier : SMD/2.2
Items for defining ITS-90 , Temperature : -189.3442 °C
Argon cell
Absolute expanded uncertainty : 0.8 mK
Direct comparison
Adiabatic calorimeter
Approved on 20 May 2010
Institute service identifier : SMD/1.1
Mass , Mass : 0.1 kg to 1 kg
Mass standard
Absolute expanded uncertainty : 1.5E1 µg to 1.5E2 µg
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Mass , Mass : 10 g to 100 g
Mass standard
Absolute expanded uncertainty : 7 µg to 1.5E1 µg
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Mass , Mass : 0.1 g to 1 g
Mass standard
Absolute expanded uncertainty : 2 µg to 3 µg
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Mass , Mass : 1 mg to 100 mg
Mass standard
Absolute expanded uncertainty : 1 µg to 2 µg
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Mass , Mass : 1 g to 10 g
Mass standard
Absolute expanded uncertainty : 3 µg to 7 µg
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Impedance (up to the MHz range) , Capacitance for low loss capacitors : 1 pF to 1000 pF
Fixed capacitor: air, 4TP
Relative expanded uncertainty : 1.7E2 µF/F to 1.7E3 µF/F
{"row_1":{"col_1":"","col_2":"100 Hz","col_3":"1 kHz","col_4":"10 kHz","col_5":"100 kHz","col_6":"1 MHz"},"row_2":{"col_1":"1 pF","col_2":"-","col_3":"620","col_4":"180","col_5":"290","col_6":"1700"},"row_3":{"col_1":"10 pF","col_2":"-","col_3":"210","col_4":"170","col_5":"240","col_6":"990"},"row_4":{"col_1":"100 pF","col_2":"-","col_3":"170","col_4":"170","col_5":"180","col_6":"420"},"row_5":{"col_1":"1 nF","col_2":"-","col_3":"170","col_4":"170","col_5":"200","col_6":"540"},"row_6":{"col_1":"10 nF","col_2":"100","col_3":"80","col_4":"220","col_5":"240","col_6":"-"},"row_7":{"col_1":"100 nF","col_2":"100","col_3":"80","col_4":"220","col_5":"240","col_6":"-"},"row_8":{"col_1":"1 µF","col_2":"140","col_3":"120","col_4":"400","col_5":"450","col_6":"-"}}
The expanded uncertainties are expressed in µF/F
Substitution
Frequency : 1 kHz to 1 MHz
Approved on 06 August 2013
Institute service identifier : SMD/69
DC voltage (up to 1100 V) , DC voltage sources: single values : 1 V to 10 V
Solid state voltage standard
Relative expanded uncertainty : 1.0E2 nV/V to 1.5E2 nV/V
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (nV/V)","col_3":"Method of measurement","col_4":"Reference standard used in calibration"},"row_2":{"col_1":"1 V","col_2":"150","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"},"row_3":{"col_1":"1.018 V","col_2":"150","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"},"row_4":{"col_1":"10 V","col_2":"100","col_3":"Direct comparison with standard","col_4":"Josephson Voltage Standard"}}
The expanded uncertainties are expressed in nV
Direct comparison with standard
Fixed voltage : 1 V, 1.018 V, 10 V
Approved on 07 February 2019
Institute service identifier : SMD/1
Items for defining ITS-90 , Temperature : 0.01 °C
Long stem SPRT
Absolute expanded uncertainty : 0.3 mK
Measurement at water triple point
Temperature-controlled bath
Approved on 20 January 2010
Institute service identifier : SMD/2.3
Mass , Mass : 1000 kg to 5000 kg
Mass standard
Absolute expanded uncertainty : 1.0E1 g to 5.0E1 g
Comparison in air
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 21 October 2001
Linear dimensions , Diameter standards : 0.5 mm to 300 mm
External cylinder (plug): diameter D
Absolute expanded uncertainty : 0.14 µm to 0.3 µm
Q[0.14 µm, 0.86E-06 D]
1-D comparator and 2 spherical probes
Reference : plug
Approved on 10 October 2017
Institute service identifier : 2.2.4.1a
Impedance (up to the MHz range) , Capacitance: capacitance for low loss capacitors : 1 pF to 1000 pF
Fixed capacitor, decadic values, air, 4TP
Relative expanded uncertainty : 1.7E2 µF/F to 2.1E2 µF/F
{"row_1":{"col_1":"<br>","col_2":"1 kHz"},"row_2":{"col_1":"1 pF","col_2":"210"},"row_3":{"col_1":"10 pF","col_2":"210"},"row_4":{"col_1":"100 pF","col_2":"210"},"row_5":{"col_1":"1000 pF","col_2":"170"},"row_6":{"col_1":"","col_2":""},"row_7":{"col_1":"","col_2":""},"row_8":{"col_1":"","col_2":""}}
Uncertainty expressed in µF/F
Substitution
Frequency : 1 kHz
LCR meter
Approved on 10 June 2021
Institute service identifier : 5.4.2.1b
Items for defining ITS-90 , Temperature : 0 °C to 419 °C
Long stem SPRT
Absolute expanded uncertainty : 1.6 mK to 2.9 mK
Measurement at fixed points
Ambient temperature : (22 ± 1) °C
Three zone furnace
Approved on 17 January 2013
Institute service identifier : SMD/3.6
Items for defining ITS-90 , Temperature : 0 °C to 156 °C
Long stem SPRT
Absolute expanded uncertainty : 0.7 mK to 1.8 mK
Measurement at fixed points
Ambient temperature : (22 ± 1) °C
Three zone furnace
Approved on 17 January 2013
Institute service identifier : SMD/3.4
Items for defining ITS-90 , Temperature : -189.3442 °C
Long stem SPRT
Absolute expanded uncertainty : 1 mK
Measurement at Argon point
Adiabatic calorimeter
Approved on 20 May 2010
Institute service identifier : SMD/2.1
Items for defining ITS-90 , Temperature : -38.8344 °C
Mercury cell
Absolute expanded uncertainty : 0.6 mK
Direct comparison
Temperature controlled bath
Approved on 20 May 2010
Institute service identifier : SMD/1.2

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