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Article: A double-primary dead-weight tester for pressures (35-175) kPa in gage mode.
- Article from:
- Journal of Research of the National Institute of Standards and Technology
- Article date:
- January 1, 2003
- Author:
CopyrightCOPYRIGHT 2003 National Institute of Standards and Technology. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Primary pressure standards in the atmospheric pressure range are often established using mercury manometers. Less frequently, controlled-clearance deadweight testers in which one component (normally the piston) has been dimensionally measured have also been used. Recent advances in technology on two fronts i) the fabrication of large-diameter pistons and cylinders with good geometry; and ii) the ability to measure the dimensions of these components, have allowed some dead-weight testers at NIST to approach total relative uncertainties (k = 2) in dimensionally-derived effective areas near 5 x [10.sup.-6]. This paper describes a single piston/cylinder assembly ...
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