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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)
Viet Nam, VMI-STAMEQ (Viet Nam Metrology Institute, Directorate for Standards and Quality)
Fluid flow ,
Volume water flowrate
:
1 m3/h to 200 m3/h
Water-flow meter
Relative expanded uncertainty
:
0.1 %
Positive displacement, turbine, differential pressure, ultrasonic, vortex, electromagnetic
Fluid : water
Temperature : ambient, 15 °C to 30 °C
Pressure : ambient, 86 kPa to 108 kPa
Approved on 18 April 2012
Fluid flow ,
Static volume of liquid
:
100 mL to 5000 mL
Volumetric test measure (graduated neck type and pycnometer)
Relative expanded uncertainty
:
1.0E-2 % to 2.0E-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
Pressure ,
Absolute 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-1-3.1.2
Radiations of the mise en pratique ,
Laser radiations
:
633 nm
Frequency stabilized laser
Absolute expanded uncertainty
:
4.0E-2 fm
Optical beat frequency
Temperature : (20 ± 3) °C
Approved on 28 February 2011
Institute service identifier : VMI-STAMEQ/V01-50
Time scale difference ,
Time scale difference
:
-1 s to 1 s
Local clock vs UTC(VMI-STAMEQ)
Absolute expanded uncertainty
:
2 ns
Time interval measurement
1 pps amplitude : > 0.5 V (50 Ω)
Averaging time : 1 day
DUT effects excluded
Approved on 19 July 2010
Institute service identifier : VN1.1.1
Time scale difference ,
Time scale difference
:
-1 s to 1 s
Local clock vs UTC
Absolute expanded uncertainty
:
2.0E2 ns
Time comparison against the predicted time
1 pps amplitude : > 0.5 V (50 Ω)
Averaging time : 5 days
Prediction time : 45 days
DUT effects excluded
Approved on 19 July 2010
Institute service identifier : VN1.1.2
Frequency ,
Frequency
:
10 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
Pressure ,
Gauge pressure: oil medium
:
0.5 MPa to 100 MPa
Pressure balance
Absolute expanded uncertainty
5.5E-05p p pressure in Mpa
The uncertainty is expressed in MPa
Direct comparison with pressure standard: crossfloat
Temperature : (20 ± 2) °C
Approved on 18 October 2011
Institute service identifier : VMI-P-2-3.2.2
Items for defining ITS-90 ,
Temperature
:
231.928 °C
SPRT
Absolute expanded uncertainty
:
1.2 mK
Tin freezing point cell
3-zone furnace, seal cellModified on 09 February 2015
Approved on 22 January 2013
Institute service identifier : VMI-STAMEQ/T-4-132
Linear dimensions ,
Diameter standards
:
1 mm to 200 mm
External cylinder (plug): diameter L
Absolute expanded uncertainty
:
0.38 µm to 0.53 µm
Q[0.38 µm, 1.8E-6L] L representing length
Length measuring machine with laser interferometer
Temperature : (20 ± 0.5) °C
Approved on 28 February 2011
Institute service identifier : VMI-STAMEQ/V01-41
Linear dimensions ,
End standards
:
0.5 mm to 100 mm
Gauge blocks: central length L, ceramic
Absolute expanded uncertainty
:
6.2E1 nm to 1.7E2 nm
Q[62 nm, 1.5E-6L] L representing length
Mechanical comparison
Temperature : (20 ± 0.5) °C
Approved on 28 February 2011
Institute service identifier : VMI-STAMEQ/V01-06
