NBS Special Publication, Issue 250U.S. Government Printing Office, 1965 |
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Page
... intervals , time signals , UT2 corrections , radio propagation forecasts , and alerts concerning outstanding geophysical events , as indicated in the following table . details , see NBS Miscellaneous Publication 236.9 ) ( For further ...
... intervals , time signals , UT2 corrections , radio propagation forecasts , and alerts concerning outstanding geophysical events , as indicated in the following table . details , see NBS Miscellaneous Publication 236.9 ) ( For further ...
Page 19
... intervals of less than five years , and then only if the instrument is to be used over the upper part of its frequency range . 201.301 Standard resistors for current measurements . ( a ) Calibration : The Bureau normally calibrates only ...
... intervals of less than five years , and then only if the instrument is to be used over the upper part of its frequency range . 201.301 Standard resistors for current measurements . ( a ) Calibration : The Bureau normally calibrates only ...
Page 20
... intervals of less than two years . Item Description Fee 201.301a - 1 Initial determination of resistance of a single - range resistor or one range of a multirange resistor , at 30 percent rated current or less ( current rating not to ...
... intervals of less than two years . Item Description Fee 201.301a - 1 Initial determination of resistance of a single - range resistor or one range of a multirange resistor , at 30 percent rated current or less ( current rating not to ...
Page 21
... with time . ( 2 ) Once stability has been established , a volt box should not require recalibrations at intervals less than two years . 201.302a Determination of ratio on one range at rated voltage 21 Item Fee Description.
... with time . ( 2 ) Once stability has been established , a volt box should not require recalibrations at intervals less than two years . 201.302a Determination of ratio on one range at rated voltage 21 Item Fee Description.
Page 25
... intervals less than 5 years . Item Description Fee 201.306a - 1 Determinations of the ratio and phase angle of a current transformer on one range at one frequency and one burden ( not less than 0.2 ohm resistance ) at not more than six ...
... intervals less than 5 years . Item Description Fee 201.306a - 1 Determinations of the ratio and phase angle of a current transformer on one range at one frequency and one burden ( not less than 0.2 ohm resistance ) at not more than six ...
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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).