NBS Special Publication, Issue 250U.S. Government Printing Office, 1965 |
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Page
... Angle blocks . 202. 507 Polygons .. 202. 508 Master balls_ 202. 509 Gears .... Mass and volume__ 202. 620 General 202. 621 202. 622 202. 623 202. 624 Reference standards of mass . Large mass standards____ Pressure - gage testing ...
... Angle blocks . 202. 507 Polygons .. 202. 508 Master balls_ 202. 509 Gears .... Mass and volume__ 202. 620 General 202. 621 202. 622 202. 623 202. 624 Reference standards of mass . Large mass standards____ Pressure - gage testing ...
Page 24
... angle . However , in some instances the ratio can be reported to an accuracy of 0.02 percent and the phase angle to 0.5 min . ( b ) Test information : Tests cannot be started until information is furnished concerning the following ...
... angle . However , in some instances the ratio can be reported to an accuracy of 0.02 percent and the phase angle to 0.5 min . ( b ) Test information : Tests cannot be started until information is furnished concerning the following ...
Page 25
... angle on the various ranges , and the Bureau should be consulted before tests on a large number of ranges are requested . ( e ) Demagnetization : Unless otherwise specified , current transformers will be demagnet- ized before being ...
... angle on the various ranges , and the Bureau should be consulted before tests on a large number of ranges are requested . ( e ) Demagnetization : Unless otherwise specified , current transformers will be demagnet- ized before being ...
Page 26
... angle for settings of the dials of a current transformer comparator for 60 Hz ( not exceeding 13 points on ratio dial and 15 on phase angle dial ) __ Determination according to 201.307a having been made , for 10 deter- minations at 25 ...
... angle for settings of the dials of a current transformer comparator for 60 Hz ( not exceeding 13 points on ratio dial and 15 on phase angle dial ) __ Determination according to 201.307a having been made , for 10 deter- minations at 25 ...
Page 29
... angle . When a decade inductive voltage divider exhibits large changes in phase angle on repeated measurements after the switches have been disturbed , the divider should no longer be considered satisfactory for use as a standard of ...
... angle . When a decade inductive voltage divider exhibits large changes in phase angle on repeated measurements after the switches have been disturbed , the divider should no longer be considered satisfactory for use as a standard of ...
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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).