Dragana Naumovic-Vukovic, Slobodan Skundric, Dragan Kovacevic, Srdjan Milosavljevic
Main characteristic of high accuracy class current transformers is very small amplitude and phase errors (approximately 10 ppm). Such an error is a reason of complexity and sensitiveness of that metrological task. This paper presents a new method for high accuracy class current transformers calibration simultaneously with two different measuring apparatus. The method is presented as well as measuring scheme and calibration results. Estimation of uncertainty of measurement shows that this method has better results than separated calibration methods.
XIX IMEKO World Congress
· TC4
· 2009
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Andre Buß
At PTB, one designed and investigated measurement setups to determine the deformation of force transducers while applying a static or dynamic force. To measure the deformation, a differential vibrometer is used which is integrated in the measurement setups. Using the deformation results one is able to calculate the transducers stiffness. An evaluation of the measurement uncertainty is presented as well as first experimental results.
XIX IMEKO World Congress
· TC3
· 2009
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Jean-Claude Krynicki
When analyzing customer satisfaction data it is very often requested for the metrologist to provide a leverage index in order to identify which attribute of the product or service (predictor) needs to be improved to increase the satisfaction level (dependant variable). This is usually done by the means of a questionnaire with many items each covering an attribute and performing a quantitative analysis using partial least square, Theil’s index or neural networks. In practice it is observed that long questionnaires give very few responses (5-10%). Shorter questionnaires are poor in information...
XIX IMEKO World Congress
· TC7
· 2009
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Yohan Kondo, Kazuyuki Sasajima, Sonko Osawa, Osamu Sato, Tsukasa Watanabe
The pitch measuring accuracy for gear measuring instruments (GMIs) is evaluated by measuring a calibrated artifact. We proposed a novel artifact which called multiball artifact (MBA). The MBA is composed of the pitch balls assumed to gear teeth and the reference axis assumed to a center axis of gear. The MBA can be calibrated more accurate than a conventional pitch artifact. When the MBA is calibrated, it is important to eliminate an error of measuring instrument; therefore we calibrate the MBA adapting the multiple-orientation technique. In the multiple-orientation technique, the MBA is set...
XIX IMEKO World Congress
· TC14
· 2009
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Zbigniew Czaja, Wojciech Toczek
A new Built-In-Self-Test scheme for diagnosis of analog fully differential circuits in embedded mixed-signal microsystems is presented. The measurement procedure is realized by the internal resources of the microcontroller. The real and imaginary parts of the output differential voltage are measured with common-mode excitation of the circuit under test (CUT). The diagnosis procedure is based on the fault dictionary stored in the memory of the microcontroller. The dictionary is created in polar coordinates during the design of the system.
XIX IMEKO World Congress
· TC10
· 2009
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Michal Pawlowski, Bartosz Gapinski, Miroslaw Rucki
In the paper, the issue of the form deviation measurement with coordinate measuring machines is being discussed. As an example, the out-of-cylindricity was taken, and their dependence on the various factors, that affect the final results of measurement and could expand its uncertainty. The supporting expert program Valetz is presented, too. It was designed to simulate the measurement of out-of-cylindricity with various input data, and to analyze the possible final uncertainty. In the paper, the simulation results are compared with the experimental measurement with CMM, and also with...
XIX IMEKO World Congress
· TC14
· 2009
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Jiun-Kai Chen, Chao-Jung Chen, Yeu-Jong Huang, Hsin-Chia Ho
From a view of human safety and product improvement, precise and reliable calibration facilities are the index of industrial development. In NML (National Measurement Laboratory), shock accelerometer is calibrated by comparing to a reference transducer with acceleration range from 1000 m/s² to 10000 m/s². For the Taiwan's industrial demand of low shock calibration and decrease the inconvenience due to transfer the standard from foreign primary shock calibration Lab. NML prepare to develop a low shock calibration system during 2009. We set up two simulations to confirm the ISO 16063-13. First...
XIX IMEKO World Congress
· TC22
· 2009
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Sam-Yong Woo, In-Mook Choi, Han-Wook Song, Boo-Shik Kim
This paper describes a newly organized APMP absolute pressure inter-comparison and a weight handling device used for this comparison. The device is specially developed for stability monitoring of transfer gauge. The pressure range of comparison is from 10 kPa to 110 kPa in the absolute mode.
XIX IMEKO World Congress
· TC16
· 2009
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Mitsuru Takahashi, Manabu Gouko, Koji Ito
Strokes are a leading cause of adult disabilities, and training in voluntary movement has been effective in rebuilding the motor skills of stroke patients. We are developing n EEG-FES system that can assist in the reconstruction of a closed loop between motor commands ans sensory feedback in stroke patients. The system uses a event-related desynchronization (ERD) to reflect motor intentions. We did a pilot study on RD before applying for stroke patients. This study focused on how FES (sensory feedback) affects ERD. Research has showed that sensory feedback affects ERD, but it is unclear...
XIX IMEKO World Congress
· TC18
· 2009
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Sonko Osawa, Osamu Sato, Yohan Kondo, Masaharu Komori, Toshiyuki Takatsuji
Evaluation of measurement performance of a gear measuring instrument (GMI) is not easy task since a master gear with sufficient accuracy has not been available. The manufacturing the master gear with an ideal involute form is very difficult and the accuracy of the master gear is not able to be estimated. Therefore, we have proposed a new artifact named Double Ball Artifact (DBA) which consists of a base plate and two balls for evaluating the gear profile measurement performance by the GMI. It has advantages of inexpensive, accurate, and calibrated with traceability. The DBA, however, is able...
XIX IMEKO World Congress
· TC14
· 2009
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