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Chemical Analyte
Geographical location
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)
Singapore, NMC, A*STAR (National Metrology Centre, Agency for Science, Technology and Research)
Angle , Angle instruments : 0 ' to 30 '
Autocollimator: error of indicated angle
Absolute expanded uncertainty : 0.4 "
Small angle generator
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/AG/002
Linear dimensions , Diameter standards : 1 mm to 150 mm
External cylinder (plug, pin, wire)
Absolute expanded uncertainty : 0.6 µm
Single-axis measuring machine
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/D034A
Angle , Angle instruments : -150 " to 150 "
Autocollimator: error of indicated angle
Absolute expanded uncertainty : 8.0E-2 "
Reference autocollimator and small angle generator
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/AG/002A
Complex geometry , CMM artefacts : 0 mm to 1200 mm
Step gauge
Absolute expanded uncertainty : 0.51 µm to 3.4 µm
Q[0.51 µm , 2.8 x 10-6L]
High precision CMM
Approved on 07 September 2021
Institute service identifier : LS/CMM/001
Linear dimensions , Diameter standards : 5 mm to 150 mm
Internal cylinder (ring)
Absolute expanded uncertainty : 0.5 µm
Single-axis measuring machine
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/D006A
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length L
Absolute expanded uncertainty : 3.6E1 nm to 9.7E1 nm
Q[36 nm, 0.9 x 10-6 L] L is the central length
Mechanical comparison to gauge block
Material : ceramic, reference and test the same
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/LS/GB/002
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length L
Absolute expanded uncertainty : 2.9E1 nm to 5.6E1 nm
Q[29 nm, 0.47 x 10-6 L] L is the central length
Interferometry, fringe fraction
Material : tungsten carbide
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/LS/GB/001
Linear dimensions , Line standards : 0 mm to 400 mm
Grid plate: grid point coordinates L; deviation from squareness
Absolute expanded uncertainty : 0.5 µm to 1.5 µm
Q[0.09 µm, 1.5 x 10-6L, 0.50 µm + 2.0 x 10-6L] L is the grid point coordinates
Optical comparison, Ultra QV CMM
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/GP/001
Complex geometry , Surface texture : 0.01 µm to 50 µm
roughness standard: ISO roughness parameters: Ra/Rq R
Absolute expanded uncertainty : 9 nm to 9.1E2 nm
Q[9 nm, 18 x 10-3R] R is the roughness value
Stylus instrument
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/SR-SH/001
Complex geometry , Surface texture : 10 µm to 500 µm
roughness standard: ISO roughness parameters: RSm
Absolute expanded uncertainty : 9.7E1 nm to 2.3E3 nm
Q[87 nm, 4.4 x 10-3RSm] R is the roughness value
Stylus instrument
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/SR-SH/001
Linear dimensions , Line standards : 50 nm to 5.00E4 nm
1-D grating: pitch p
Absolute expanded uncertainty : 9.0E-2 nm to 6.0E1 nm
Q[0.06 nm, 1.2 x 10-3P] p is the pitch value
Large range metrological AFM
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/LS/SH-P/001
Linear dimensions , Line standards : 50 nm to 5.00E4 nm
2-D grating: pitch p
Absolute expanded uncertainty : 9.0E-2 nm to 6.0E1 nm
Q[0.06 nm, 1.2 x 10-3P] p is the pitch value
Large range metrological AFM
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/LS/SH-P/001
Form , Flatness standards : 0.02 µm to 5 µm
Optical flat: flatness F
Absolute expanded uncertainty : 3.2E-2 µm
Laser interferometer
Maximum diameter : 150 mm
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/GPI/001
Complex geometry , Surface texture : 0.03 µm to 600 µm
roughness standard: ISO roughness parameters: Rz/Rt R
Absolute expanded uncertainty : 2.7E1 nm to 1.1E4 nm
Q[27, 18R] R in µm
The uncertainty is expressed in nm
Stylus instrument
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/SR-SH/001
Complex geometry , Surface texture : 5.00E-3 µm to 500 µm
Step height standard (e.g. ISO 5436-1 Type A1): step height h
Absolute expanded uncertainty : 4 nm to 1.1E3 nm
Q[4 nm, 2 x 10-3h] h is the step height
Stylus instrument
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/SR-SH/001
Form , Roundness standards : 0 µm to 2 µm
Sphere(Hemisphere): roundness R
Absolute expanded uncertainty : 7 nm to 6.7E1 nm
Q[7 nm, 33 x 10-3R] R is the roundness value
Multi-step, work piece on spindle roundness instrument
diameter size : 5 mm to 100 mm
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/D058
Form , Flatness standards : 0.1 µm to 0.2 µm
Optical flat: flatness F
Absolute expanded uncertainty : 0.1 µm
Interferometry
Maximum diameter : 150 mm
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/D029
Form , Diameter standards : 0.1 mm to 30 mm
Sphere (ball): diameter
Absolute expanded uncertainty : 0.5 µm
Stylus profilometer
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/BD/001
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length L
Absolute expanded uncertainty : 3.6E1 nm to 1.1E2 nm
Q[36 nm, 1.0 x 10-6 L] L is the central length
Mechanical comparison to gauge block
Material : steel, reference and test the same
Approved on 04 November 2010
Institute service identifier : NMC, A*STAR/LS/GB/002
Complex geometry , Surface texture : 0.05 µm to 1000 µm
Step height standard (e.g. ISO 5436-1 Type A1): step height h
Absolute expanded uncertainty : 2.4E-2 µm to 1.1E1 µm
Q[0.024 µm, 10 x 10-3h] h is the step height
laser confocal microscope
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/SH/001

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Acoustics, Ultrasound, Vibration

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This metrology area covers the fields of laser frequencies and dimensional metrology.

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This metrology area covers all fields relevant to chemistry and biology.

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This metrology area covers the fields of dosimetry, radioactivity and neutron measurements.