Physics

Chemistry

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General Information:

Address: No.18,Bei San Huan
Dong Lu,Chaoyang
Dist,Beijing,P.R.China, 100013

ws@nim.ac.cn
Tel:+86-10-64525678

Search CMCs:

Length

No.

Calibration or Measurement Service

Measurand Level or Range

Measurement Conditions/Independent Variable

Expanded Uncertainty

Class or Quantity

Measurand(Quantity Instrument or Artifact)

Instrument Type or Method

Minimum value

Maximum value

Units

Parameter

Specifications

Value

Units

Coverage Factor

Level of confidence

Is the expanded uncertainty a relative one?

Matrix uncertainty

Length

1

Laser radiations

Stabilized laser of the mise en pratique: vacuum wavelength (absolute frequency)

Optical beat frequency

633

633

nm

 

 

24

kHz

2

95%

No

 

2

Laser radiations

Stabilized laser
of the mise en pratique: absolute frequency

He-Ne/I2 laser, optical beat frequency

543

543

nm

 

 

0.00000

 

2

95%

Yes

 

3

End Standards

Gauge blocks:
central length L

Interferometry by exact fractions

0.5

100

 mm

 

 

Q[ 22, 0.2L ], L in mm, values range from 22 nm to 30nm

nm

2

95%

No

 

4

End Standards

Gauge blocks:
central length L

Interferometry by exact fractions

125

1000

 mm

 

 

Q[ 70, 0.28L ], L in mm, values range from 78 nm to 289nm

nm

2

95%

No

 

5

End Standards

Gauge blocks:
central length L

Mechanical comparison to gauge block

0.5

100

 mm

 

 

Q[ 100, 1.0L ], L in mm, values range from 70 nm to 141nm

nm

2

95%

No

 

6

End Standards

Gauge blocks:
central length L

Mechanical comparison to gauge block

125

1000

 mm

 

 

Q[ 100, 1.0L ], L in mm, values range from 160 nm to 1005nm

nm

2

95%

No

 

7

Line Standards

Line scale:line spacingL

Interferometry and photoelectric microscope

1

1000

 mm

 

 

(0.1+0.0001L),L in mm,values range from 0.1 µm to 0.2 µm

μm

2

95%

No

 

8

Diameter Standards

Plug,ball or sphere:diamter

1-D contact comparator, gauge substitution

1

200

 mm

 

 

0.3

μm

2

95%

No

 

9

Surface Texture

Groove depth or step height standard. R

Interferometric microscope

0.1

40

μm

 

 

(6+30R), R in μm, values range from 9 nm to 1200 nm

nm

2

95%

No

 

10

Surface Texture

Roughnees standard: ISO parameters, e.g.Ra

Profile stylus instrument

0.025

5

μm

 

 

(6+30Ra), Ra in μm, values range from 7 nm to 156 nm

nm

2

95%

No

 

11

CMM Artifacts

Step gauge: central length of steps L

Laser Interferometer + CMM

0

1100

mm

 

 

0.20.5in m

μm

2

95%

No

 

12

CMM Artifacts

Ball bar: central length spacing L

Laser Interferometer + CMM

10

960

mm

 

 

0.2in m

μm

2

95%

No

 

13

CMM Artifacts

Ball plate: central coordinates

Laser Interferometer + CMM

20×20

960×960

mm2

 

 

0.2in m

μm

2

95%

No

 

14

CMM Artifacts

Bore plate: central coordinates

Laser Interferometer + CMM

20×20

960×960

mm2

 

 

0.2in m

μm

2

95%

No

 

15

Line standards

invar wire

3m standard scale,Comparative measurement

3

24

m

temperature

20°C±0.5°C

13(24m)

μm

2

95%

No

 

16

Line standards

invar standard tape

Laser  interferometer

0

200

m

temperature

20°C±0.5°C

3+2×10-6L--m

μm

2

95%

No

 

17

Line standards

standard steel tape

Laser  interferometer

0

200

m

temperature

20°C±0.5°C

3+3×10-6L--m

μm

2

95%

No

 

18

Line standards

steel tape

Laser  interferometer

0

200

m

temperature

20°C±0.5°C

7+3×10-6L--m

μm

2

95%

No

 

19

Length
instruments

laser tracker:error of indicated (size; location)

Comparison to laser interferometer

0

26

m

temperature

20°C±0.5°C

0.14+3×10-7LL--m

μm

2

95%

No

 

20

Length
instruments

laser interferometer:error of indicated displacement

Comparison to
master interferometer

0

26

m

temperature

20°C±0.5°C

0.14+3×10-7LL--m

μm

2

95%

No

 

21

Length  Instruments

GPS Receiver

Ultra-short baseline

6

12

m

length

 

2.2

mm

2

95%

No

 

 

Short baseline

0.2

4

km

length

 

2.7

mm

2

95%

No

 

 

Long baseline

6

93

km

length

 

3.2

mm

2

95%

No

 

22

Length  Instruments

Total Station(Distance Meter):error of indicated distance

Standard Baseline

6

1176

m

length

 

0.6+0.7×10-6LL in km

mm

2

95%

No

 

23

Diameter

standards

Plug Gauge

1-D contact comparator, gauge substitution

0

200

mm

temperature

20°C±0.3°C

(0.1+0.001L)mm

mm

 k =2

95%

No

 

Ring Gauge

2

201

mm

temperature

20°C±0.3°C

(0.17+0.001L)mm

mm

 k =2

95%

No

 

24

Angle by Circle Dividers

12 side polygon

Combine 

Full Circle
 Close Method

0

360

degree

temperature

20°C±1°C

0.09

arc
second

2.01

95%

No

 

25

Angle Artifacts

angle block

Full circle close method or Comparison at multi-position method

0

180

degree

temperature

20°C±1°C

0.2

arc
second

1.98

95%

No

 

26

angle instrument

autocollimator

direct measurement

0

150

arcsecond

temperature

20°C±1°C

0.07

arc
second

2

95%

No

 

27

Angle by Circle Dividers

index table

Combine 

Full Circle
 Close Method

0

360

degree

temperature

20°C±1°C

0.1

arc
second

2

95%

No

 

28

Gear helix master

Helical angle β

Gear measuring center (CNC)

0

15

degree

temperature

20°C±0.5°C

1.2  

micron

2

95%

No

 

15

30

degree

temperature

20°C±0.5°C

1.7 

micron

2

95%

No

 

30

60

degree

temperature

20°C±0.5°C

1.9

micron

2

95%

No

 

29

Gear involute master

Base radius rb

Gear measuring center (CNC)

0

60

mm

temperature

20°C±0.5°C

1.0

micron

2

95%

No

 

60

150

mm

temperature

20°C±0.5°C

1.5

micron

2

95%

No

 

150

200

mm

temperature

20°C±0.5°C

1.6

micron

2

95%

No

 

30

Screw Standards:thread plug, plain.

pitch diameter

Master Scanner

1

50

mm

temperature

20°C±1°C

3

μm

2

95%

No

 

pitch

0.1

5

mm

1.5

μm

2

95%

No

 

flank angle

25

35

°

3

'

2

95%

No

 

31

Screw Standards:thread ring, plain.

pitch diameter

Master Scanner

2.5

60

mm

temperature

20°C±1°C

3

μm

2

95%

No

 

pitch

0.1

5

mm

1.5

μm

2

95%

No

 

flank angle

25

35

°

3

'

2

95%

No

 

32

Screw Standards:thread plug, tapered.

pitch diameter

Master Scanner

1

50

mm

temperature

20°C±1°C

3

μm

2

95%

No

 

pitch

0.1

5

mm

1.5

μm

2

95%

No

 

flank angle

25

35

°

3

'

2

95%

No

 

taper angle

1:4

1:4

--

0.002/L

mm/mm

2

95%

No

 

33

Screw Standards:thread ring, tapered.

pitch diameter

Master Scanner

2.5

60

mm

temperature

20°C±1°C

3

μm

2

95%

No

 

pitch

0.1

5

mm

1.5

μm

2

95%

No

 

flank angle

25

35

°

3

'

2

95%

No

 

taper angle

1:4

1:4

--

0.002/L

mm/mm

2

95%

No