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Dragana Naumovic-Vukovic, Slobodan Skundric, Dragan Kovacevic, Srdjan Milosavljevic
CALIBRATION OF HIGH ACCURACY CLASS STANDARD CURRENT TRANSFORMERS

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.

Andre Buß
STATIC AND DYNAMIC MEASUREMENT OF FORCE TRANSDUCER'S DEFORMATION UNDER LOAD

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.

Jean-Claude Krynicki
CUSTOMER SATISFACTION SURVEYS: A SIMPLIFIED METHOD TO CREATE A LEVERAGE INDEX USING QUALITATIVE DATA

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 but increase drastically the response rate (20 to 40%) and more interestingly the customer comments are quite systematic (up to 90% of opened questions are documented).
Facing such behavior leads to the question of creating a leverage index out of qualitative data.
This paper will present a method to categorize the verbatim in such a way that a numeric contribution of product or service attributes can be measured.

Yohan Kondo, Kazuyuki Sasajima, Sonko Osawa, Osamu Sato, Tsukasa Watanabe
ADVANCED CALIBRATION METHOD FOR PITCH ARTIFACT

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 up in difference orientations around the reference axis and the measurement error is eliminates by averaging the measurement value for all orientations. There are, however, Fourier components of the measurement error that can not be eliminated depending on the total number of orientations. In this paper, we propose the advanced calibration method; the error separation method for the multiple-orientation technique is improved and the total number of orientations can be reduced. The superiority of the proposed method is clarified from the calibration results using the MBA.

Zbigniew Czaja, Wojciech Toczek
FAULT DIAGNOSIS OF FULLY DIFFERENTIAL CIRCUITS IN ELECTRONIC EMBEDDED SYSTEMS

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.

Michal Pawlowski, Bartosz Gapinski, Miroslaw Rucki
EXPERIMENTAL CHECK OF THE SIMULATED CYLINDER’S GEOMETRICAL CHARACTERISTICS OBTAINED FROM THE EXPERT PROGRAM

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 reference measurement with specialized device. Comparative analysis contained the evaluation of the relative error of the method.

Jiun-Kai Chen, Chao-Jung Chen, Yeu-Jong Huang, Hsin-Chia Ho
TWO SHOCK MACHINE SIMULATIONS PRESTUDY FOR PRIMARY LOW LEVEL SHOCK CALIBRATION SYSTEM

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 simulation is to set up a simple pendulum instead of rigid body motion, and second one is to generate shock waveform using a shaker. Two realistic simulation results show the feasibility of the constructing primary shock calibration system and provide a well experiment to our future work.

Sam-Yong Woo, In-Mook Choi, Han-Wook Song, Boo-Shik Kim
DEVELOPMENT OF WEIGHT HANDLING DEVICE FOR APMP ABSOLUTE PRESSURE INTERCOMPARISON, APMP.M.P-K9

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.

Mitsuru Takahashi, Manabu Gouko, Koji Ito
MUSCULAR SENSATION INDUCE EVENT RELATED DESYNCHRONIZATION (ERD) ON FOOT MOTOR AREA

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 which sensory inputs (tactile, muscular, tendinous or articular) are the main causes. We examined how ERD is affected by functional electrical stimulation (FES) of both feet of healthy subjects. The results indicated that the ERD increases as the FES was increased. The ERD was greater under the leg-free condition than under the leg-fixed condition, which suggests that muscular and articular sensations induce ERD in the foot motor area (Cz). This results show that our EEG-FES system can be applied for rehabilitation of stroke patients.

Sonko Osawa, Osamu Sato, Yohan Kondo, Masaharu Komori, Toshiyuki Takatsuji
A NOVEL ARTIFACT FOR EVALUATING ACCURACIES OF GEAR PROFILE AND PITCH MEASUREMENTS OF GEAR MEASURING INSTRUMENTS

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 only to evaluate the profile measurement capability of the GMI. In this paper, we describe a novel artifact evaluating the profile and the pitch measurement performances of the GMI simultaneously.

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