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Small-capacity deadweight force standard machine compensating loading frame
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DOI：10.1016/j.measurement.2011.09.023.png)
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Abstract
En 中文
The Korea Research Institute of Standards and Science (KRISS) has developed a 20 N deadweight force standard machine. The machine consists of a weight stack, a loading frame, a taring system, a main body and a control system. The taring system has the role of compensating the initial force generated by the loading frame. With two motors, a displacement sensor, several limit switches, and a synthetic control system consisting of a programmable logic controller and an operating PC, the machine can be operated almost fully automatically. The machine can generate a compressive force in the range of 0.5-22 N with a relative expanded uncertainty of 1.0 x 10(-4). The machine was compared with a 200 N deadweight force standard machine. In the comparison, the relative deviation was 5.8 x 10(-5), less than the declared expanded uncertainty of the force standard machines, therefore confirming the machine's accuracy. (C) 2011 Elsevier Ltd. All rights reserved.
Keywords:
Deadweight force machine
Loading frame compensation
Uncertainty
Evaluation
Comparison
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