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Calibration and Measurement Capabilities
Length

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

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Your selection : Length

China, NIM (National Institute of Metrology)

Angle artifacts. Angle block, 0 degree to 180 degree

Absolute expanded uncertainty (k = 1.98, level of confidence 95%) in arc second: 0.2

Full circle close method or comparison at multi-position method

Temperature: 20 °C ± 1 °C

Approved on 08 Octobre 2012

Internal NMI service identifier: NIM/CNAS L0502-37


Angle by circle dividers. 12 side polygon, 0 degree to 360 degree
	Absolute expanded uncertainty (k = 2.01, level of confidence 95%) in arc second: 0.09
	Combine full circle close method
	Temperature: 20 °C ± 1 °C
	Approved on 08 Octobre 2012
	Internal NMI service identifier: NIM/CNAS L0502-36


Angle by circle dividers. Index table, 0 degree to 360 degree
	Absolute expanded uncertainty (k = 2, level of confidence 95%) in arc second: 0.1
	Combine full circle close method
	Temperature: 20 °C ± 1 °C
	Approved on 08 Octobre 2012
	Internal NMI service identifier: NIM/CNAS L0502-42


Angle instrument. Autocollimator, 0 arcsecond to 150 arcsecond
	Absolute expanded uncertainty (k = 2, level of confidence 95%) in arc second: 0.07
	Direct measurement
	Temperature: 20 °C ± 1 °C
	Approved on 08 Octobre 2012
	Internal NMI service identifier: NIM/CNAS L0502-39


CMM artefacts. Ball bar: central length spacing L, 0 mm to 1000 mm
	Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.2 + L), L in m
	CMM with laser interferometer
	Temperature: 20 °C ± 0.2 °C
	Approved on 28 January 2010
	Internal NMI service identifier: NIM/C-NIM-CD19A


CMM artefacts. Ball plate: 2D centre coordinates, 0 mm to 1000 mm
	Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.2 + L), L in m
	CMM with laser interferometer
	Temperature: 20 °C ± 0.2 °C
	Approved on 28 January 2010
	Internal NMI service identifier: NIM/C-NIM-CD19B


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