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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] = [a² + b²]^1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)

China, NIM (National Institute of Metrology)

Time scale difference , Time scale difference : -0.5 s to 0.5 s

Remote clock vs UTC

Absolute expanded uncertainty : 1.6E1 ns

GPS common view

Measurement time : 1 d

Prediction time : 20 d

Excluded DUT's effect

Approved on 31 October 2017

Institute service identifier : NIM/TF-4

Frequency , Frequency : 100 MHz

Remote frequency standard

Relative expanded uncertainty : 1.1E-13 Hz/Hz

GPS common view

Measurement time : 1 d

Amplitude : > 0.5 V (50 Ω)

Excluded DUT's effect

Approved on 31 October 2017

Institute service identifier : NIM/TF-16

Frequency , Frequency : 10 MHz

Remote frequency standard

Relative expanded uncertainty : 1.1E-13 Hz/Hz

GPS common view

Measurement time : 1 d

Amplitude : > 0.5 V (50 Ω)

Excluded DUT's effect

Approved on 31 October 2017

Institute service identifier : NIM/TF-15

Frequency , Frequency : 5 MHz

Remote frequency standard

Relative expanded uncertainty : 1.1E-13 Hz/Hz

GPS common view

Measurement time : 1 d

Amplitude : > 0.5 V (50 Ω)

Excluded DUT's effect

Approved on 31 October 2017

Institute service identifier : NIM/TF-14

Time scale difference , Time scale difference : -0.5 s to 0.5 s

Remote clock vs UTC(NIM)

Absolute expanded uncertainty : 1.1E1 ns

GPS common view

Measurement time : 1 d

Excluded DUT's effect

Approved on 31 October 2017

Institute service identifier : NIM/TF-3

Viet Nam, VMI-STAMEQ (Viet Nam Metrology Institute, Directorate for Standards and Quality)

Frequency , Frequency : 1 MHz

Local frequency standard

Relative expanded uncertainty : 2.0E-13 Hz/Hz

Direct frequency measurement

Gate time : 1000 s

Number of measurements : 100

Amplitude : > 0.5 V (50 Ω)

DUT effects excluded

Approved on 19 July 2010

Institute service identifier : VN2.1.1

Mass , Mass (E2) : 1 mg to 100 mg

Mass standard

Absolute expanded uncertainty : 2.0E-3 mg to 5.3E-3 mg

Uncertainty table

{"row_1":{"col_1":"","col_2":"E2","col_3":"F1","col_4":"F2","col_5":"M1"},"row_2":{"col_1":"20 kg","col_2":"10.0","col_3":"33.3","col_4":"100","col_5":"333"},"row_3":{"col_1":"10 kg","col_2":"5.3","col_3":"16.7","col_4":"53.3","col_5":"167"},"row_4":{"col_1":"5 kg","col_2":"2.67","col_3":"8.33","col_4":"26.70","col_5":"83.3"},"row_5":{"col_1":"2 kg","col_2":"1.00","col_3":"3.33","col_4":"10.00","col_5":"33.3"},"row_6":{"col_1":"1 kg","col_2":"0.53","col_3":"1.67","col_4":"5.33","col_5":"16.7"},"row_7":{"col_1":"500 g","col_2":"0.267","col_3":"0.830","col_4":"2.670","col_5":"8.33"},"row_8":{"col_1":"200 g","col_2":"0.100","col_3":"0.330","col_4":"1.000","col_5":"3.33"},"row_9":{"col_1":"100 g","col_2":"0.053","col_3":"0.167","col_4":"0.530","col_5":"1.67"},"row_10":{"col_1":"50 g","col_2":"0.033","col_3":"0.100","col_4":"0.330","col_5":"1.000"},"row_11":{"col_1":"20 g","col_2":"0.033","col_3":"0.083","col_4":"0.267","col_5":"0.830"},"row_12":{"col_1":"10 g","col_2":"0.020","col_3":"0.067","col_4":"0.200","col_5":"0.667"},"row_13":{"col_1":"5 g","col_2":"0.0167","col_3":"0.0533","col_4":"0.167","col_5":"0.533"},"row_14":{"col_1":"2 g","col_2":"0.013","col_3":"0.0400","col_4":"0.133","col_5":"0.400"},"row_15":{"col_1":"1 g","col_2":"0.010","col_3":"0.0333","col_4":"0.100","col_5":"0.333"},"row_16":{"col_1":"500 mg","col_2":"0.0083","col_3":"0.0267","col_4":"0.083","col_5":"0.267"},"row_17":{"col_1":"200 mg","col_2":"0.0067","col_3":"0.0200","col_4":"0.067","col_5":"0.200"},"row_18":{"col_1":"100 mg","col_2":"0.0053","col_3":"0.0167","col_4":"0.053","col_5":"0.167"},"row_19":{"col_1":"50 mg","col_2":"0.0040","col_3":"0.0133","col_4":"0.040","col_5":"0.133"},"row_20":{"col_1":"20 mg","col_2":"0.0033","col_3":"0.0100","col_4":"0.033","col_5":"0.100"},"row_21":{"col_1":"10 mg","col_2":"0.0027","col_3":"0.0083","col_4":"0.027","col_5":"0.083"},"row_22":{"col_1":"5 mg","col_2":"0.0020","col_3":"0.0067","col_4":"0.020","col_5":"0.067"},"row_23":{"col_1":"2 mg","col_2":"0.0020","col_3":"0.0067","col_4":"0.020","col_5":"0.067"},"row_24":{"col_1":"1 mg","col_2":"0.0020","col_3":"0.0067","col_4":"0.020","col_5":"0.067"}}

The expanded uncertainties given in this table are expressed in mg

Comparison in air

Temperature : 20 °C

Humidity : (40 to 50) % RH

Approved on 09 September 2010

Institute service identifier : VMI-STAMEQ/1

Mass , Mass (E2) : 0.1 kg to 1 kg

Mass standard

Absolute expanded uncertainty : 5.3E-2 mg to 0.53 mg

Uncertainty table

The expanded uncertainties given in this table are expressed in mg

Comparison in air

Temperature : 20 °C

Humidity : (40 to 50) % RH

Approved on 09 September 2010

Institute service identifier : VMI-STAMEQ/5

Fluid flow , Static volume of liquid : 5 L to 500 L

Volumetric test measure (vessel overflow type 5 L to 50 L and graduated neck type 50 L to 500 L)

Relative expanded uncertainty : 2.0E-2 % to 1.2E-2 %

Gravimetric determination

Liquid : distilled water

Temperature of liquid : 20 °C ± 1 °C

Temperature variation : less than 1 °C in hour

Approved on 18 April 2012

Items for defining ITS-90 , Temperature : 419.527 °C

SPRT

Absolute expanded uncertainty : 2 mK

Zinc freezing point cell

3-zone furnace, seal cellModified on 09 February 2015

Approved on 22 January 2013

Institute service identifier : VMI-STAMEQ/T-5-132

Linear dimensions , Line standards : 0.01 mm to 1000 mm

Precision line scale: line spacing L, glass

Absolute expanded uncertainty : 0.6 µm to 1.7 µm

Q[0.6 µm, 1.5E-6L] L representing length

Line scale interferometer

Temperature : (20 ± 0.5) °C

Approved on 28 February 2011

Institute service identifier : VMI-STAMEQ/V01-32

Items for defining ITS-90 , Temperature : 29.7646 °C

SPRT

Absolute expanded uncertainty : 0.6 mK

Gallium melting point cell

Cryostat, seal cellModified on 09 February 2015

Approved on 22 January 2013

Institute service identifier : VMI-STAMEQ/T-3-132

Mass , Mass (E2) : 10 g to 100 g

Mass standard

Absolute expanded uncertainty : 2.0E-2 mg to 5.3E-2 mg

Uncertainty table

The expanded uncertainties given in this table are expressed in mg

Comparison in air

Temperature : 20 °C

Humidity : (40 to 50) % RH

Approved on 09 September 2010

Institute service identifier : VMI-STAMEQ/4

Mass , Mass (E2) : 1 g to 10 g

Mass standard

Absolute expanded uncertainty : 1.0E-2 mg to 2.0E-2 mg

Uncertainty table

The expanded uncertainties given in this table are expressed in mg

Comparison in air

Temperature : 20 °C

Humidity : (40 to 50) % RH

Approved on 09 September 2010

Institute service identifier : VMI-STAMEQ/3

Radiations of the mise en pratique , Laser radiations : 474 THz

Frequency stabilized laser

Absolute expanded uncertainty : 2.4E1 kHz

Optical beat frequency

Temperature : (20 ± 3) °C

Approved on 28 February 2011

Institute service identifier : VMI-STAMEQ/V01-50

Linear dimensions , End standards : 0.5 mm to 100 mm

Gauge blocks: central length L, tungsten carbide

Absolute expanded uncertainty : 6.2E1 nm to 1.4E2 nm

Q[62 nm, 1.2E-6L] L in mm, value varies from 62 nm to 135 nm
The uncertainty is expressed in nm

Mechanical comparison

Temperature : (20 ± 0.5) °C

Approved on 28 February 2011

Institute service identifier : VMI-STAMEQ/V01-06

Linear dimensions , Line standards : 0.01 mm to 1000 mm

Precision line scale: line spacing L, steel

Absolute expanded uncertainty : 0.6 µm to 1.9 µm

Q[0.6 µm, 1.8E-6L] L representing length

Line scale interferometer

Temperature : (20 ± 0.5) °C

Approved on 28 February 2011

Institute service identifier : VMI-STAMEQ/V01-32

Mass , Mass (E2) : 1 kg to 20 kg

Mass standard

Absolute expanded uncertainty : 0.53 mg to 1.0E1 mg

Uncertainty table

The expanded uncertainties given in this table are expressed in mg

Comparison in air

Temperature : 20 °C

Humidity : (40 to 50) % RH

Approved on 09 September 2010

Institute service identifier : VMI-STAMEQ/6

Fluid flow , Gas flowrate volume : 0.05 m³/h to 5 m³/h

Gas-flow meter

Relative expanded uncertainty : 0.15 % to 0.3 %

Turbine, rotameter, gasmeter

Fluid : dry air

Temperature : ambient, 15 °C to 30 °C

Pressure : 100 kPa to 800 kPa

Pressure at inlet DUT

Approved on 18 April 2012

Pressure , Gauge pressure: oil medium : 0.5 MPa to 100 MPa

Pressure gauge

Absolute expanded uncertainty

6.0E-05p

p pressure in Mpa

The uncertainty is expressed in MPa

Direct comparison with pressure standard

Temperature : (20 ± 2) °C

Approved on 18 October 2011

Institute service identifier : VMI-P-2-3.2.2

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