• Title/Summary/Keyword: Source Meter

Search Result 172, Processing Time 0.027 seconds

The Improvement of Accuracy and Measurement Speed in the Low Current Measurement System (저전류 측정 시스템에서의 정밀도 및 측정 속도 향상)

  • Baek, Wang-Ki;Choi, In-Kyu;Park, Jong-Sik;Lee, Kyung-Ho
    • Proceedings of the KIEE Conference
    • /
    • 2002.11c
    • /
    • pp.550-553
    • /
    • 2002
  • A source meter is a basic instrument to perform a measurement of DC characteristic of semiconductor devices. the source meter can be used as variable voltage source, variable current source, voltage meter, or current meter. The accuracy of the low current measurement can be improved with the compensation of leakage current and charge and discharge current. In the low current measurement, the RC time constant is extremely big, so the measurement speed is very low. In this thesis, the analysis of the behavior of the measurement current according to the RC time constant and output capacitance and the method to accelerate the measurement speed.

  • PDF

Design and Implementation of High Power Source Measurement Unit (고 전력 Source Measurement Unit의 설계 및 제작)

  • Lee, Sang-Gu;Baek, Wang-Gi;Park, Jong-Sik
    • Proceedings of the KIEE Conference
    • /
    • 2003.11c
    • /
    • pp.860-863
    • /
    • 2003
  • In this paper high power SMU(Source Measurement Unit) having 50V/1.5A source/measure range has been designed and implemented. The SMU has two operation mode, voltage mode and current mode. The SMU can be used as variable voltage source, variable current source, voltage meter, or current meter. Combining two different unit, output power can be doubled as 100V/1.5A. The developed SMU tan be used many semiconductor testing system and electronic device inspecting system.

  • PDF

Experimental Characteristic Analysis of Induction Watthour Meter by Input Source with Harmonics (고조파 함유전원에 의한 유도형 적산전력량계의 실험적 특성해석)

  • Jang, Seok-Myeong;Lee, Sung-Ho;Park, Young-Tae
    • Proceedings of the KIEE Conference
    • /
    • 1998.07a
    • /
    • pp.58-60
    • /
    • 1998
  • The precise measurement of consumed power during the given time is very important in the energy management aspect. Up to days, induction watthour meter has been designed for use in the alternating circuits in which the voltage and current are essentially sinusoidal. The use of switching elements in power system causes the current or voltage involving harmonics. Therefore the registration error is caused by harmonics in the equipment for measuring power. This paper presents the registration error of the induction watthour meter in the presence of harmonic distortion. The accuracy of a watthour meter on loads in which the input source is not sinusoidal is investigated. And the effects of individual harmonic are reported by experiment.

  • PDF

Correlation Analysis of the Thermal Conductivity Heat Flow Meter and MTPS (Modified Transient Plane Source) Method Using Wood Flooring and Wall Materials (목질마루바닥재와 벽체용 재료를 이용한 평판열류계법과 MTPS (Modified Transient Plane Source)법의 열전도율 상관관계 분석)

  • Cha, Jung-Hoon;Seo, Jung-Ki;Kim, Su-Min
    • Journal of the Korea Furniture Society
    • /
    • v.22 no.2
    • /
    • pp.118-125
    • /
    • 2011
  • These days global warming is the most important problem and the most important factor is high emission of carbon dioxide. The 23% of carbon dioxide emission for building construction must be reduced. Thermal conductivity is the most basic factor that can decrease the energy consumption especially insulation. Therefore, an accurate and continuous thermal conductivity measurement can be a way to save energy. In this paper, there are methods about how to investigate thermal conductivity measurements and comparing two methods which are the Heat Flow Meter 436 and TCi.

  • PDF

Design of a Remote Meter Reading module considering battery life time (배터리 수명을 고려한 원격검침 모듈 설계)

  • Jeong, Won-Chang;Gu, Myeong-Mo;Jang, Sung-Joo;Kim, Sang-Bok
    • Journal of the Korea Society of Computer and Information
    • /
    • v.13 no.4
    • /
    • pp.45-50
    • /
    • 2008
  • Meter reading modules, which read the meter and transmit the data to water management offices, can't use the electric wires for their power supply. Therefore, batteries have to be used for meter reading modules and that cause maintenance problems like periodic batteries replacement. To save the maintenance cost, a wireless transmitting solution with less power consumption is required. In This paper, we designed a remote meter reading module, which reads meter automatically with less power consumption of battery by effective management of power source and transmits the reading data using RF.

  • PDF

Radiation-training system with a custom survey-meter mock-up in a browser-based mixed reality environment

  • Hiroyuki Arakawa;Toshioh Fujibuchi;Kosuke Kaneko;Yoshihiro Okada;Toshiko Tomisawa
    • Nuclear Engineering and Technology
    • /
    • v.56 no.6
    • /
    • pp.2428-2435
    • /
    • 2024
  • Training for radiation protection and control requires a visual understanding of radiation, which cannot be perceived by the human senses. Trainees must also master the effective use of measuring instruments. Traditionally, such training has exposed trainees to radiation sources. Here, we present a novel e-training strategy that enables safe, exposure-free handling of a radiation measuring tool called a survey meter. Our mixed reality radiation-training system merges the physical world with a digital one. Collaborating with a mixed reality headset (HoloLens 2), this system constructs a mock-up of a survey meter in real-world space. The HoloLens 2 employs a browser-based application to visualize radiation and to simulate/share the use of the survey meter, including its physical movements. To provide a dynamic learning experience, the system adjusts the survey-meter mock-up readings according to the operator's movements, distance from the radiation source, the response time of survey meter, and shielding levels. Through this approach, we expect that trainees will acquire practical skills in interpreting survey-meter readings and gain a visual understanding of radiation in real-world situations.

Characteristics on the Harmonic Sensitivity of an Induction Watthour Meter (유도형 적산전력량계의 고조파 민감도 특성)

  • Jang, Seok-Myeong;Lee, Seong-Ho;Park, Yeong-Tae
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.48 no.11
    • /
    • pp.587-596
    • /
    • 1999
  • The use of Switching elements in power systems causes the current or voltage to involve harmonic waves. Harmonics bring about registration errors of the equipment for measuring power. In case the induction watthour meter designed on sinusoidal source is used in the measurement of power with harmonics, the precise measurement of power has many problems because harmonics cause a decrease of power factor and vibration by the unstable driving force on the aluminum disc. In this paper, analysis and test results on the harmonic sensitivity of an induction watthour meter is reported when the input voltage and current with harmonics were supplied to single-phase watthour meter.

  • PDF

Relation with Activity of Road Mobile Source and Roadside Nitrogen Oxide Concentration (도로이동오염원의 활동도와 도로변 질소산화물 농도의 관계)

  • Kim, Jin Sik;Choi, Yun Ju;Lee, Kyoung Bin;Kim, Shin Do
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.32 no.1
    • /
    • pp.9-20
    • /
    • 2016
  • Ozone has been a problem in big cities. That is secondary air pollutant produced by nitrogen oxide and VOCs in the atmosphere. In order to solve this, the first to be the analysis of the $NO_x$ and VOCs. The main source of nitrogen oxide is the road mobile. Industrial sources in Seoul are particularly low, and mobile traffics on roads are large, so 45% of total $NO_x$ are estimated that road mobile emissions in Seoul. Thus, it is necessary to clarify the relation with the activity of road mobile source and $NO_x$ concentration. In this study, we analyzed the 4 locations with roadside automatic monitoring systems in their center. The V.K.T. calculating areas are set in circles with 50 meter spacing, 50 meter to 500 meter from their center. We assumed the total V.K.T. in the set radius affect the $NO_x$ concentration in the center. We used the hourly $NO_x$ concentrations data for the 4 observation points in July for the interference of the other sources are minimized. We used the intersection traffic survey data of all direction for construction of the V.K.T. data, the mobile activities on the roads. ArcGIS application was used for calculating the length of roads in the set radius. The V.K.T. data are multiplied by segment traffic volume and length of roads. As a result, the $NO_x$ concentration can be expressed as linear function formula for V.K.T. with high predictive power. Moreover we separated background concentration and concentrations due to road mobile source. These results can be used for forecasting the effect of traffic demand management plan.

Usefulness of wearing pocket dosimeter in nuclear medicine (핵의학 영상검사에서 Pocket dosimeter 착용의 유용성 평가)

  • Kim, Young-Bin;Lee, Eun-Ji;Kim, Kun-Jae
    • The Korean Journal of Nuclear Medicine Technology
    • /
    • v.15 no.1
    • /
    • pp.25-28
    • /
    • 2011
  • Purpose: The aim of study is to find accuracy of pocket dosimeter in measuring exposed dose in compared with survey meter and to compare exposed dose according as Nuclear medicine exams. Materials and Method: First, radiation dose to point source(185 MBq,370 MBq, ${\ldots}$, 1665 MBq, 1850 MBq) were measured in using a pocket dosimeter and a survey meter. Second, radiation dose to 12 patients injected $^{18}F$-FDG 370 MBq were measured in using a pocket dosimeter and a survey meter. Third, radiation dose to 10 patients injected $^{99m}Tc$-DPD 925 MBq were measured in using a pocket dosimeter and a surveymeter. Result: The average is $70.12{\pm}39.36{\mu}Sv/h$ in measurement of point source with Surveymeter and $5{\pm}3.06{\mu}Sv$ in measurement of point source with Pocket dosimeter. The average is $25.04{\pm}6.16{\mu}Sv/h$ in measurement of PET/CT patients with Surveymeter and $2.41{\pm}0.51{\mu}Sv$ in measurement of PET/CT with Pocket dosimeter. The average is $8.58{\pm}0.96{\mu}Sv/h$ in measurement of Bone Scan patients with Surveymeter and $1{\mu}Sv$ in measurement of Bone Scan patients with Pocket dosimeter. Significant difference found between Survey meter value and Pocket dosimeter value in all experimentation (p<0.001). Conclusion: Accoring to rusult Wearing Pocket dosimeter is usefulnee in manerage of exposed dose in nucler medicine exams.

  • PDF

A Pipeline Network Analysis on the Source and the Relation with Pipe Diameter of the Flow Hunting in a Orifice Meter (오리피스 유량계의 유동헌팅 원인과 배관경과의 상관관계에 대한 배관망해석 연구)

  • Shin, Chang-Hoon
    • Journal of the Korean Institute of Gas
    • /
    • v.15 no.1
    • /
    • pp.54-59
    • /
    • 2011
  • Generally, the flow hunting is observed in almost all of the orifice meters but the intensity of the flow hunting is different at each metering system. In order to investigate the relations between pipe diameter and the flow instability or the flow hunting in a real metering system, a one-dimensional pipeline network model was built and analyzed for the examination of flow characteristics and relations to the flow hunting, changing diameters of the meter and the pipes before and after the meter. Finally, the effects of pressuredifference variation and flow hunting following to the variations of the diameters of the meter and the pipes before and after the meter were investigated and the relations were examined as well.