NBS Special Publication, Issue 250U.S. Government Printing Office, 1965 |
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Results 1-5 of 26
Page 16
... higher - valued resistors the accuracy is 0.5 percent . In order that the reported results be of significance it is necessary that standards submitted for tests be made of suitable materials processed in such a manner that resistance ...
... higher - valued resistors the accuracy is 0.5 percent . In order that the reported results be of significance it is necessary that standards submitted for tests be made of suitable materials processed in such a manner that resistance ...
Page 17
... higher fee is used for the firs point ( zero calibration ) at the new frequency , and the lower fee applies to additional point at that frequency . 201.105a 201.105b 201.105z Determination of either direct or grounded capacitance 17 ...
... higher fee is used for the firs point ( zero calibration ) at the new frequency , and the lower fee applies to additional point at that frequency . 201.105a 201.105b 201.105z Determination of either direct or grounded capacitance 17 ...
Page 21
... higher current at rated voltage , ( 3 ) increase approximately with the square of the applied voltage , and ( 4 ) be entirely negligible at 20 percent of rated voltage on all ranges . ( d ) Suggested test schedule : ( 1 ) Volt boxes ...
... higher current at rated voltage , ( 3 ) increase approximately with the square of the applied voltage , and ( 4 ) be entirely negligible at 20 percent of rated voltage on all ranges . ( d ) Suggested test schedule : ( 1 ) Volt boxes ...
Page 22
... higher voltages see 201.604-- * For current fees , see Appendix C. † These include the calibration of peak ac - dc voltage comparators . See NBS Technical News Bulletin 49 , No. 3 , 50 ( Mar. 1965 ) . 201.304 Ac - dc wattmeters , single ...
... higher voltages see 201.604-- * For current fees , see Appendix C. † These include the calibration of peak ac - dc voltage comparators . See NBS Technical News Bulletin 49 , No. 3 , 50 ( Mar. 1965 ) . 201.304 Ac - dc wattmeters , single ...
Page 24
... higher fees must be charged . In planning for the tests of a transformer it is therefore desirable to select a low burden , but one larger than this minimum , preferably not less than 0.2 ohm . The required total may be made up by ...
... higher fees must be charged . In planning for the tests of a transformer it is therefore desirable to select a low burden , but one larger than this minimum , preferably not less than 0.2 ohm . The required total may be made up by ...
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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).