NBS Special Publication, Issue 250U.S. Government Printing Office, 1965 |
From inside the book
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Page 51
... reflectance on the General Electric recording spectrophotometer . This calibrated Vitrolite standard and the samples to be tested are in turn placed at the sample aperture of the inte- grating sphere , and any highly reflecting ...
... reflectance on the General Electric recording spectrophotometer . This calibrated Vitrolite standard and the samples to be tested are in turn placed at the sample aperture of the inte- grating sphere , and any highly reflecting ...
Page 52
... reflectances of the test samples relative to freshly pre- pared MgO are then obtained by multiplying ( at the respective corrected wavelength ) the values for these samples read from the curve sheet , by the ratios of ( a ) the standard ...
... reflectances of the test samples relative to freshly pre- pared MgO are then obtained by multiplying ( at the respective corrected wavelength ) the values for these samples read from the curve sheet , by the ratios of ( a ) the standard ...
Page 53
... reflectance for use on Gen- eral Electric recording spectrophotometers with 6 ° from perpen- dicular irradiation and diffuse reception ; standards consist of white structural Vitrolite glass , 4 x 4 in . , 6 in . thick ; report includes ...
... reflectance for use on Gen- eral Electric recording spectrophotometers with 6 ° from perpen- dicular irradiation and diffuse reception ; standards consist of white structural Vitrolite glass , 4 x 4 in . , 6 in . thick ; report includes ...
Page 54
... reflectance curves obtained on General Electric recording spectrophotometer , including ( 1 ) Vitrolite calibration curve for correcting values relative to fresh MgO as 100 percent , ( 2 ) zero curve , ( 3 ) didymium glass curve for ...
... reflectance curves obtained on General Electric recording spectrophotometer , including ( 1 ) Vitrolite calibration curve for correcting values relative to fresh MgO as 100 percent , ( 2 ) zero curve , ( 3 ) didymium glass curve for ...
Page 55
... reflectance or transmittance from spectrophotometric data for certain specified light sources , per source per sample__ Determination of the Munsell renotation or book notation of a speci- men from its daylight reflectance and ...
... reflectance or transmittance from spectrophotometric data for certain specified light sources , per source per sample__ Determination of the Munsell renotation or book notation of a speci- men from its daylight reflectance and ...
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Common terms and phrases
Ac-dc accepted for calibration accuracy additional American Standards Association API Standard apparatus Appendix attenuators bolometer bolometer units bulb and liquid Bureau of Standards calibration or test changes in emf charged dependent color temperature condenser microphones current fees decibels Determination diameter Electric electrode electromotive force end of table errors exceeding footnote at end frequency Gage blocks gages-determination glass Group of Standard higher or lower hygrometers ice-point reading indications inductors instruments Invar Item Description Fee laboratory length liquid column mass measurements meter National Reference Group ohms perature phase angle plug Precision pressure Radium ratio reference standards REPORT OF CALIBRATION resistance thermometer resistors ring gages sample saturated standard cells schedule special tests specifications spectrophotometer stability standard resistors submitted for calibration tabulated corrections apply temperature range test points test_ tests not covered thermal conductivity thermocouple thermometer was tested U.S. DEPARTMENT uncertainty voltage dividers waveguide weights
Popular passages
Page 11 - Standard Reference Materials issued by the National Bureau of Standards to calibrate a measurement system, or to produce scientific data that can be referred to a common base. A schedule of prices and amounts, as well as directions for ordering, is included.
Page 49 - ... index markers. Since it is necessary to determine the shift of the principal point resulting from prism effect in the lens, the equivalent focal length of the lens as mounted In the camera is incidentally determined...
Page 55 - ... wire loops, spring balances, tension handles, or other attachments liable to be detached or changed in shape. The error in the total length of the tape, when supported horizontally throughout its length at the standard temperature of 68° F. (20° C.) and at standard tension, shall not be more than 0.1 inch per 100 feet (2 mm per 25 m).