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Displaying 26 - 44 of 44

Summary Proceedings: Legal Metrology Seminar for the Americas

January 1, 2001
Author(s)
S E. Chappell, Charles D. Ehrlich, Kenneth S. Butcher
This paper provides a report on the Legal Metrology Seminar for the Americas that was held in conjunction with the 85th annual meeting of the National Conference on Weights and Measures (NCWM) in Richmond, VA, from July 16 through July 20, 2000. The

Issues in Purchasing and Maintaining Intrinsic Standards

December 1, 2000
Author(s)
R B. Pettit, K Jaeger, Charles D. Ehrlich
Intrinsic standards offer many advantages over conventional artifact standards, including, in many cases, a very low uncertainty of measurement and no need for periodic re-calibration. Because of the recent increased interest in intrinsic standards, NCSL

A primary pressure standard at 100 kPa

June 1, 1999
Author(s)
James W. Schmidt, Y Q. Cen, Robert G. Driver, Walter J. Bowers Jr., J C. Houck, S A. Tison, Charles D. Ehrlich
Primary pressure standards in the atmospheric pressure range are often established using mercury manometers. To a lesser extent controlled-clearance dead-weight testers in which one component (normally the piston) has been dimensionally measured have also

Metrological Timelines in Traceability

January 1, 1998
Author(s)
S D. Rasberry, Charles D. Ehrlich
Current developments and applications in the field of metrology have increased the need for correct and appropriate usage of the terms and concepts related to measurement traceability. Besides traceability itself, some of the interrelated terms include

Recommended practices for the calibration and use of leaks

January 1, 1992
Author(s)
Charles D. Ehrlich
This document is the consensus view of the Calibrated Leak Subcommittee of the Recommended Practices Committee of the American Vacuum Society. It is divided into four main sections: Description, Calibration, Proper Usage, and Recommended Documentation of

A note on flow rate and leak rate units

April 28, 1986
Author(s)
Charles D. Ehrlich
The confusion in the literature and in the laboratory surrounding the terminology and units of gas flow rates, particularly as applied to calibrated leak artifacts, has prompted this discussion of leak rate units. Special attention is paid to conflicting