• Title/Summary/Keyword: GPIB

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Realization of CAT Interface supporting Multitask (다중처리를 지원하는 CAT 인터페이스에 관한 연구)

  • 전동근;노승환;차균현
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.12
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    • pp.1423-1436
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    • 1992
  • In the paper, a CAT interface supporting multitask is realized. To interface a computer with measuring instruments, a GPIB card is designed and implemented. Controlling and displaying software using OOP and GUI are programmed with C++. A spectrum analyzer and a power meter are chosen as object instrument to be controlled. Total 9 modules are configured to manage the various resources and each module in integrated system. Also in case that several instruments are used, the system is realized to be capable of multitasking to exchange the data mutually. The multitasking is implemented under the time-sharing DOS environment. Thread-based method is used for processing, and Round Robin method for scheduling. Provided proper software modules for other object instruments are integrated, the system can control more measuring instruments simultaneously by the computer. Users can save the time and errors even without expert knowledge.

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The measurement of three-dimensional temporal behavior according to the pressure in the plasma display panel (플라즈마 디스플레이 패널의 압력별 3차원 시간 분해 측정)

  • Kim, Son-Ic;Choi, Hoon-Young;Lee, Seok-Hyun;Lee, Seung-Gol
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1628-1630
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    • 2002
  • In this paper, we measured 3-dimensional temporal behavior of the light emitted from discharge cell of plasma display panel(PDP) as a function of the pressure using the scanned point detecting system. The detected light signal through the PM tube is sent on the oscilloscope and oscilloscope which is connected to PC with GPIB. The whole system is controlled by a PC. From the temporal behavior results, we could analyze the discharge behavior of panel with Ne-Xe(4%) mixing gas and 300torr, 400torr, 500torr pressure. The top view of panel shows that the discharge moves from inner edge of cathode electrode to outer cathode electrode forming arc type. At the 300torr, initial emission time is very fast. The side view of panel shows that the light is detected up to $150{\mu}m$ height of barrier rib. In the panel of 300torr, emission distribution is wider than the others.

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Analysis and the measurement of the variation of electric field in air and oil using optical measuring system (광계측 시스템을 이용한 유.기중 코로나 방전의 전계변화 측정 및 비교분석)

  • Ma, Ji-Hoon;Ryu, Cheol-Hwi;Kang, Won-Jong;Chang, Yong-Moo;Koo, Ja_Yoon
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1668-1670
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    • 2002
  • Since more than two decades, the conventional PD detecting systems have been employed in order to detect the partial discharges occurring inside the HV power apparatus for their diagnosis by use of different type of detection such as acoustic and UHF detection method. Regardless of their wide on-site application, a certain number of technical inconveniences have been disclosed as follows : multistage amplification. large volume, susceptible to external noise and high price. In this respect, the optical measurement techniques are widely proposed in these days in this concerned field ascribed to the following advantages : immune to external EMI noise and broad band response of the Pockels cell covering from DC to GHz. However, the reliability of several proposed techniques enabling to measure the electric field inside the large high power apparatus has not yet been well approved In this work, an optical measuring system, based on the Pockels effect, has been developed for measuring the field variation due to the corona discharges occurring in air and in oil. This system consists of He-Ne laser, single mode optical fiber, multi mode optical fiber, polarizing film, Y-cut LiNbO3 cell, photo detector, digital oscilloscope and personal computer with GPIB. For this purpose, optical probe has been specially designed and realized and put into the needle-plane electrode. Afterward, same measurement is carried out in oil. We demonstrate the characteristic of the optical measuring system and the measurement results.

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The three-dimensional temporal behavior measurement of light emitted from plasma display panel by the Scanned Point-Detecting System (Scanned Point-Detecting System을 이용한 플라즈마 디스플레이 패널에서 방출되는 광의 3차원 시간 분해 측정)

  • 최훈영;이석현;이승걸;김준엽
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.559-563
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    • 2002
  • We measure the 3-dimensional temporal behavior of the light emitted from the discharge cell of a plasma display panel (PDP) by using a scanned point detecting system. The light signal detected by a PM tube is sent to the oscilloscope, and the oscilloscope is connected to a PC with GPIB. From the resultant temporal behaviors, we could analyze the discharge characteristics of the panel with a Ne-Xe (4%) mixing gas at a 400 torr pressure. The top view of the panel shows that discharge moves from the inner edge of the cathode electrode to the outer cathode electrode, forming an arc shape. The side view of the panel shows that the light is detected up to 150 $\mu\textrm{m}$ up the barrier rib. After a trigger pulse is applied, peak intensity is detected at 730 ns and peak intensity position is located at the center of the ITO electrodes.