288. Secondary Force Standards for the Calibrating Weighing Equipment

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Paper

H N Jelinek: 288. Secondary Force Standards for the Calibrating Weighing Equipment. 1961.

 

Abstract

This paper was presented at the Twentieth National Conference of the Society of Aeronautical Weight Engineers at Akron, Ohio, May 15 – 18, 1961. The problems of inherent in obtaining secondary force standards are discussed in this paper. The types of secondary standards discussed are: (1) proving rings (2) hydraulic load cells (3) mechanical load scales (4) electric strain gage cells. Where large capacities, up to 1,000,000 lbs. of force are required; dead weights, proving rings, or electric load cells are true secondary standards. A secondary standard is defined as force calibrating equipment one step removed from NBS dead weight primary standards. Dead weights are relatively expensive.
A comparison regarding the use of proving rings or electric stress systems is made and the merits of all types of systems are summarized in a table.

 

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