Length, Thailand, NIMT (National Institute of Metrology (Thailand))
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1 Calibration or s Laser raiations Stabilize laser of the mise en pratique: absolute frequency Optical beat frequency khz 2 95% No Laser raiations Other stabilize laser: vacuum wavelength Optical beat frequency E % Yes Material steel Q[28, 0.47L ], L in, s range from 28 to Material ceramic Q[30, 0.39L ], L in, s range from 30 to Material tungsten carbie Q[28, 0.22L ], L in, s range from 28 to Material chromium carbie Q[28, 0.36L ], L in, s range from 28 to Material steel, tungsten carbie an chromium carbie Q[50, 0.50L ], L in, s range from 50 to 1.2E Material ceramic Q[70, 0.50L ], L in, s range from 70 to 1.4E+02 The BIPM key atabase, September /5
2 Calibration or s Material steel Q[50, 0.80L ], L in, s range from 1.3E+02 to 8.5E+02, 10502, Step gauge: face spacing up to 1020 Step gauge size < 1020 Q[0.26, 1.4E-03L ], Caliper checker: face spacing up to 1020 Caliper checker size < 1020 Q[0.30, 2.7E-03L ], Line stanar Precision line scale: line spacing Line scale up to 250 Glass scale low coefficient of thermal expansion (8E-08 K -1 ) Q[41, 100.0E- 03L ], Line stanar Precision line scale: line spacing Line scale up to 1000 Glass scale working stanar Q[0.11, 2.9E-03L ], D Q[0.23, 1.4E- s range from 0.23 to D Q[0.25, 1.4E- s range from 0.29 to The BIPM key atabase, September /5
3 Calibration or s Internal cyliner (plain ring gauge): D an focusing microscope Q[0.37, 1.3E- s range from 0.37 to 0.39 Angle by circle ivier Optical polygon: face angle Inexing table an one autocollimator, error separation 3 72 faces 0.2 " 2 95% No 10201, 10202, 10203, Angle by circle ivier Inexing table: inex angle Cross calibration versus polygon an autocollimator 360/n 360/n Measure angle: 360/n, number of ivision n 3, 4, 6, 8 an " 2 95% No Angle instrument Autocollimator: error of inicate angle Sine arm an autocollimator " 0.2 " 2 95% No Optical flat: flatness eviation over whole Fizeau, three flat test, automatic assessment Optical flat, optical parallel: flatness Fizeau, automatic assessment , Optical parallel: parallelism Gauge block comparator The BIPM key atabase, September /5
4 Calibration or s Rounness Glass hemisphere: rounness R Multi-step, styluson-spinle rounness instrument 0 20 Diameter 1 to 355 Q[7.7, 7.6R ], R in, s range from 7.7 to 1.6E+02 Rounness Internal an external cyliner, magnification stanar: rounness R Stylus-on-spinle rounness instrument 0 20 Diameter 1 to 355 Q[12, 12R ], R in, s range from 12 to 2.2E , type A), epth Stylus instrument Groove epth, ISO Q[6.6, 12 ], in, s range from 6.6 to 3.8E , type A), epth Interference microscope an stylus instrument (for premeasurement) Groove epth ISO Q[2.4, 5.4 ], in Non-contact optical , type A), epth profiler Groove epth ISO Q[75, 7.3], in Roughness stanar, ISO type C, D: Ra (ISO 4287) Stylus instrument Ra (ISO 4287) ISO 4287, ISO 4288, ISO Q[10, 12Ra ], Ra in, s range from 10 to 3.8E The BIPM key atabase, September /5
5 Calibration or s Roughness stanar, ISO type C, D: Rz (ISO 4287) Stylus instrument Rz (ISO 4287) ISO 4287, ISO 4288, ISO Q[18, 17Rz ], Rz in, s range from 18 to 5.4E CMM artefacts Ball plate: 2D center coorinates using swing roun metho up to 620 x 620 Ball plate size < 620 x 620 Q[0.27, 1.9E-03L ], 2-D, 3-D instruments CMM: error of inicate [size; location; shape] Comparison with gauge blocks up to 1200 x 1000 x 700 CMM size < 1200 x 1000 x 700 Q[0.52, 1.4E-03L ], 2-D, 3-D instruments CMM: error of inicate [size; location; shape] Comparison with step gauges up to 1200 x 1000 x 700 CMM size < 1200 x 1000 x 700 Q[0.52, 2.0E-03L ], The BIPM key atabase, September /5
Length, United States, NIST (National Institute of Standards and Technology)
Calibration or s Laser radiations Other stabilized laser: vacuum wavelength Optical beat frequency 633 633 4E-10 2 95% Yes 1 Length instruments Laser system: error of indicated L Comparison to master length
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Calibration or m 633 633 nm 0.5 MHz 2 95% No LS/L/001 633 633 nm 0.016 fm 2 95% No LS/L/003 474 474 THz 12 khz 2 95% No LS/L/003 543 633 nm 0.0016 fm 2 95% No LS/L/003 553 474 THz 1.2 khz 2 95% No LS/L/003
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