Special PublicationNational Bureau of Standards, 1968 |
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Results 1-5 of 26
Page 1-4
... differences among instruments , environments , and operators are bound to introduce small discrepancies . Periodic ... difference between atomic and universal time , as well as for epoch adjustments . 200.103 Types of calibration and ...
... differences among instruments , environments , and operators are bound to introduce small discrepancies . Periodic ... difference between atomic and universal time , as well as for epoch adjustments . 200.103 Types of calibration and ...
Page 2-10
... difference between the potential terminals to current through the current terminals . The resistance value will be inite and reproducible only if the current flow pattern at the potential minals is completely reproduced . This flow ...
... difference between the potential terminals to current through the current terminals . The resistance value will be inite and reproducible only if the current flow pattern at the potential minals is completely reproduced . This flow ...
Page 2-12
... difference between the maximum value and the equilibrium value can be as large as 200 ppm . The Silsbee - type and special dividers that are constructed of resistance elements having small and equal temperature coefficients and designed ...
... difference between the maximum value and the equilibrium value can be as large as 200 ppm . The Silsbee - type and special dividers that are constructed of resistance elements having small and equal temperature coefficients and designed ...
Page 2-13
... difference . therma ( c ) The ac - dc differences of commercial audio - frequency transfer standards usually are negligible ( < 0.005 % ) at intermediat frequencies . They become significant at the higher higher audio frequencie ( often ...
... difference . therma ( c ) The ac - dc differences of commercial audio - frequency transfer standards usually are negligible ( < 0.005 % ) at intermediat frequencies . They become significant at the higher higher audio frequencie ( often ...
Page 2-14
... difference test ( ordinarily at 20 Hz ) is recommended for one range , to verify the low- frequency accuracy . Thermoelements have a low frequency limit , below which they fail to integrate properly . The ac - dc difference may approach ...
... difference test ( ordinarily at 20 Hz ) is recommended for one range , to verify the low- frequency accuracy . Thermoelements have a low frequency limit , below which they fail to integrate properly . The ac - dc difference may approach ...
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Common terms and phrases
accuracy actual costs additional attenuation Attenuation Range Autocollimating available:(a bolometer unit Bureau of Standards calibration or test calibrations not covered capacitance capacitors cavity wavemeter Coaxial coaxial connectors Determination dial Direct inquiries directional couplers Estimated Limits Exposure rate Frequency MHz Frequency Range gage blocks hydrometers inch insertion loss Instr Item Description laboratory length Limits of Uncertainty mark shipments measurements not covered meter method microwave National Bureau NBS Fee Schedule neutron noise temperature nonreflecting ohms percent phase angle Phase Shifters platinum plug and ring Powermeters pyrometers R. W. Beatty R/min ratio reflection coefficient reflection coefficient magnitude resistors ring gages sample scale Section setting signal sources Special calibrations Special measurements specified specimen standard attenuation submitted surface technique Telephone Thermal thermocouple thread Type N connectors uncertainty limits values of emf voltage dividers VSWR waveguide WWVB WWVH zero ει
Popular passages
Page 1-1 - THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consistent system of physical measurement; coordinates that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce.
Page 1-1 - That the functions of the bureau shall consist in the custody of the standards; the comparison of the standards used in scientific investigations, engineering, manufacturing, commerce, and educational institutions with the standards adopted or recognized by the Government; the construction, when necessary, of standards, their multiples and subdivisions; the testing and calibration of standard measuring apparatus; the solution of problems which arise in connection with standards; the determination...
Page ii - This publication contains a descriptive listing, item by item, of most of the test and calibration work done at the National Bureau of Standards with the respective fees.
Page 1-1 - Cooperation with other governmental agencies and with private organizations in the establishment of standard practices, incorporated in codes and specifications. (5) Advisory service to Government agencies on scientific and technical problems. (6) Invention and development of devices to serve special needs of the Government.
Page 1-1 - The development of methods for testing materials, mechanisms, and structures, and the testing of materials, supplies, and equipment, including items purchased for use of Government departments and independent establishments. (d) Cooperation with other governmental agencies and with private organizations in the establishment of standard practices, incorporated in codes and specifications.
Page 1-1 - States for a complete and consistent system of physical measurements, coordinates that system with the measurement systems of other nations, and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce.
Page 2-22 - Page 43 shunts, current transformers, and voltage (potential) transformers, should be packed in separate boxes to avoid possible damage to the instruments. Heavy pieces should always be shipped in wooden boxes and held in place, if necessary, by checks or cleats. Large transformers, especially those having oilfilled iron cases, should be crated separately and arranged whenever possible so that the terminals can be made accessible for tests without removing the entire crate. (7) The tops of boxes...
Page 1-1 - ... (c) The development of methods for testing materials, mechanisms, and structures, and the testing of materials, supplies, and equipment, including items purchased for use of Government departments and independent establishments. (d) Cooperation with other governmental agencies and with private organizations in the establishment of standard practices, incorporated in codes and specifications.
Page 5-7 - Kc, for bolometer-coupler units is defined as the ratio of the substituted dc power in the bolometer unit on the side arm of the directional coupler to the microwave power incident upon a non-reflecting load connected to the output port of the main arm.