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Automatic Weight Exchanger for Series Design Calibration
이우갑,이용재,정진완 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
An automatic weight exchanger for series design calibration of a decade weights is described. The vertical pan with 6loading positions is hanged down from a balance hook. Weights are loaded on and lifted off vertically. Every weight has its own vertical guide for lifting and loading. The vertical motion is realized by 6 synchronous stepping motors. The weight exchanger is installed with a commercial balance of 205 g capacity and 0.01 mg readability. The full operation is automated with a personal computer. The performance tests were carried out. The present status results indicate: Calibration time and labor could be reduced significantly. Uncertainty could be reduced with less random error. Calibration series of 100-50-20-20’-10-10’ g was tested successfully to give the maximum Type A uncertainty of 0.014 mg. The apparatus could be incorporated with Internet web for remote calibration and training.
In Situ Direct Determination of Air Density Using Pt-Ir and Stainless Steel Standards
이우갑,이용재,정진완 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
The density of air was directly measured using a Pt-Ir kilogram prototype and a stainless steel kilogram as buoyancy artifacts (BA) in a balance using an automatic weight exchanger capable of handling four weights. The mass values of two other stainless steel weights as test objects placed on the same weight exchanger were determined by comparing them with the prototype of kilogram and using the air density measured in situ. The in situ BA method produced less uncertainty in obtaining the mass values of test weights than that by the BIPM equation method. The accuracy of the in situ direct determination of the air density could be improved by utilizing a stainless steel BA whose true mass and volume could have been known more accurately. BA then could measure the mass of any object with less uncertainty in situ.