288. Secondary Force Standards for the Calibrating Weighing Equipment


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



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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