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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)
Finland, FGI (Finnish Geospatial Research Institute)
Gravity ,
Gravitational acceleration
:
9.75 m/s2 to 9.85 m/s2
On (stable) site
Absolute expanded uncertainty
:
8.0E-8 m/s2
Free fall experiment
Ambient temperature : 21 °C ± 8 °C
Approved on 03 January 2007
Finland, MIKES (VTT Technical Research Centre of Finland Ltd, Centre for Metrology/Mittatekniikan keskus)
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
10 °C to 85 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty
:
7.0E-3 °C
Comparison
Bath : graduation 0.01 °C, reading 10 mm to 25 mm above liquid surface
Approved on 03 November 2009
Items for defining ITS-90 ,
Temperature
:
419.527 °C
Long-stem SPRT
Absolute expanded uncertainty
:
2.0E-3 °C
Fixed point
Temperature-controlled furnace : 419 °C
Standard: Zinc cell
Approved on 18 May 2004
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
1084.62 °C
Noble-metal thermocouple (type S or R)
Absolute expanded uncertainty
:
0.4 °C
Fixed point calibration
Furnace
Approved on 03 November 2009
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
-80 °C to 10 °C
Industrial Platinum Resistance Thermometer
Absolute expanded uncertainty
:
7.0E-3 °C
Comparison
Bath
Approved on 03 November 2009
Pressure ,
Absolute pressure
:
1.50E4 Pa to 3.50E5 Pa
Absolute pressure gauge
Absolute expanded uncertainty
1 + 2.5E-05p p pressure in Pa
The uncertainty is expressed in Pa
Gas medium
Uncertainty values range from 1.4 Pa to 9.8 Pa
Approved on 11 October 2005
Pressure ,
Gauge pressure
:
5.00E5 Pa to 5.00E7 Pa
Pressure balance
Absolute expanded uncertainty
12 + 2.5E-05p p pressure in Pa
The uncertainty is expressed in Pa
Oil medium
Uncertainty values range from 2.4E+01 Pa to 1.3E+03 Pa
Approved on 11 October 2005
Mass ,
Mass
:
50 kg to 2000 kg
Mass standard
Absolute expanded uncertainty
:
1.0E2 mg to 3.0E3 mg
Comparison in air
Uncertainty scales with measurand level
Approved on 11 June 2017
Torque ,
Torque
:
4 N m to 20 N m
Torque measuring device
Relative expanded uncertainty
:
8.0E-4
Mode : clockwise, anticlockwise
Approved on 11 October 2005
Pressure ,
Gauge pressure
:
2.00E8 Pa to 5.00E8 Pa
Pressure balance
Absolute expanded uncertainty
1.2E-04p p pressure in Pa
The uncertainty is expressed in Pa
Oil medium
Uncertainty values range from 2.4E+04 Pa to 6.0E+04 Pa
Approved on 11 October 2005
Complex geometry ,
Screw standards
:
3 mm to 150 mm
Thread plug, plain, pitch diameter
Absolute expanded uncertainty
:
2 µm
3-wire method, length measuring machine
Approved on 21 October 2001
Institute service identifier : MIKES/43
Impedance (up to the MHz range) ,
Inductance: self inductance, intermediate values
:
0.1 mH to 100 mH
Fixed inductor
Relative expanded uncertainty
:
2.0E1 µH/H to 1.0E2 µH/H
Uncertainty table
{"row_1":{"col_1":"","col_2":"Method of measurement","col_3":"Reference standard used in calibration","col_4":"Frequency","col_5":"Relative expanded uncertainty"},"row_2":{"col_1":"100 mH","col_2":"Series resonance","col_3":"Capacitance standard","col_4":"1 kHz, 1.592 kHz","col_5":"20"},"row_3":{"col_1":"10 mH to 100 mH","col_2":"2 DVM","col_3":"Resistance standard","col_4":"50 Hz to 1000 Hz","col_5":"50"},"row_4":{"col_1":"100 µH to 10 mH","col_2":"2 DVM","col_3":"Resistance standard","col_4":"50 Hz to 2000 Hz","col_5":"20"}}
2 DVM, series resonance
Frequency : 50 Hz to 2000 Hz, 1592 Hz
Approved on 11 May 2017
Institute service identifier : MIKES/93n
High voltage and current ,
High AC voltage: peak values
:
0 % to 10 %
linearity of peak voltage responding measuring system, AC voltmeter, AC voltaqe source
Relative expanded uncertainty
:
0.1 %
Linearity extension according to IEC 60060-2
Voltage range : 100 kV to 1000 kV
Frequency : 46 Hz to 60 Hz
Approved on 11 May 2017
Institute service identifier : MIKES/HV16a
High voltage and current ,
High AC voltage: peak values
:
1 kV to 200 kV
Peak voltage responding measuring system, AC voltmeter, AC voltaqe source
Relative expanded uncertainty
:
5.0E1 µV/V
Comparison with dedicated set-up for high voltage
Frequency : 45 Hz to 60 Hz
Approved on 11 May 2017
Institute service identifier : MIKES/HV16
AC current ,
AC current up to 100 A: sources
:
0.025 A to 10 A
Multifunction calibrator, AC current source
Relative expanded uncertainty
:
2.5E1 µA/A
Direct comparison
Frequency : 45 Hz to 65 Hz
Approved on 06 August 2013
Institute service identifier : MIKES/179a
DC resistance ,
DC resistance standards and sources: high values
:
1.00E-3 GΩ to 1.00E5 GΩ
Standard resistor
Relative expanded uncertainty
:
3 µΩ/Ω to 1.5E3 µΩ/Ω
Uncertainty table
{"row_1":{"col_1":"","col_2":"Relative expanded uncertainty","col_3":"Method of measurement"},"row_2":{"col_1":"1 MΩ to 10 MΩ","col_2":"3","col_3":"DCC bridge or Modified Wheatstone bridge"},"row_3":{"col_1":"10 MΩ to 100 MΩ","col_2":"5","col_3":"Modified Wheatstone bridge"},"row_4":{"col_1":"0.1 GΩ to 1 GΩ","col_2":"10","col_3":"Modified Wheatstone bridge"},"row_5":{"col_1":"1 GΩ to 10 GΩ","col_2":"20","col_3":"Modified Wheatstone bridge"},"row_6":{"col_1":"10 GΩ to 100 GΩ","col_2":"25","col_3":"Modified Wheatstone bridge"},"row_7":{"col_1":"0.1 TΩ to 1 TΩ","col_2":"70","col_3":"Modified Wheatstone bridge"},"row_8":{"col_1":"1 TΩ to 10 TΩ","col_2":"500","col_3":"Modified Wheatstone bridge"},"row_9":{"col_1":"10 TΩ to 100 TΩ","col_2":"1500","col_3":"Modified Wheatstone bridge"}}
DCC bridge, modified Wheatstone bridge
Approved on 06 January 2015
Institute service identifier : MIKES/37n
DC current (up to 100 A) ,
DC current meters: high values
:
10 A to 100 A
Current clamp
Relative expanded uncertainty
:
0.5 %
Multiturn coil
Approved on 06 August 2013
Institute service identifier : MIKES/77
Frequency ,
Frequency
:
1 MHz
Local frequency standard
Relative expanded uncertainty
:
3.0E-12 Hz/Hz
Phase time measurement
Averaging time : 1000 s
Approved on 08 June 2007
Institute service identifier : MIKES/2
Frequency ,
Frequency
:
5 MHz
Local frequency standard
Relative expanded uncertainty
:
3.0E-12 Hz/Hz
Phase comparator
Averaging time : 1 s
Approved on 08 June 2007
Institute service identifier : MIKES/3
Frequency ,
Frequency
:
10 Hz to 5.00E9 Hz
General frequency source
Absolute expanded uncertainty
(1E-11)f + 1E-05 f frequency in Hz
The uncertainty is expressed in Hz
Counter
Averaging time : 100 s
Approved on 08 June 2007
Institute service identifier : MIKES/6
