scholarly journals A METHOD FOR CALIBRATING 10-TURN AND 50-TURN CURRENT COIL USING MULTIPRODUCT CALIBRATOR

2019 ◽  
Vol 21 (3) ◽  
pp. 171
Author(s):  
Hayati Amalia ◽  
Agah Faisal
Keyword(s):  
Measurement Method ◽  
Evaluation Methods ◽  
Uncertainty Estimation ◽  
Uncertainty Component ◽  
Evaluation Result ◽  
Current Coil ◽  
National Measurement ◽  
Ac Current ◽  
Result Analysis ◽  
Dc Current

<p>This paper presents a traceable measurement method developed in the Laboratory of National Measurement Standards for Electricity and Time (NMS Lab for Electricity and Time) - National Standardization Agency of Indonesia for calibrating current coil in order to obtain correction and uncertainty estimation of the current coil windings number (N). Current coils as objects of this research were 10-turn and 50-turn current coil. Calibration was performed using standard multiproduct calibrator (MPC) and two auxiliary devices, current coil F-5500 and clamp meter F-337. Correction and uncertainty values of N current coil were evaluated for DC and AC supplied current using formulation developed based on principle of current division between current coil output and supplied current from MPC. Based on evaluation result analysis, the expanded uncertainties of this method span from 0.47% to 1.0% (when supplied by DC current) and from 0.57% to 1.1% (when supplied by AC current) for 10-turn current coil, and span from 0.44% to 0.65% (when supplied by DC current) and from 0.54% to 0.96% (when supplied by AC current) for 50-turn current coil. Moreover, it also showed that the largest uncertainty component came from current coil F-5500. Meanwhile, the largest correction for 10-turn current coil was obtained 1.2% at 10 A DC, and for 50-turn current coil was obtained -0.47% at 700 A AC. Verification of the calibration and evaluation methods had also been carried out and it indicated that the calibration and analysis methods developed can be used to examine the performance of the current coil.</p>

scholarly journals PENGEMBANGAN ALAT UKUR BATAS KAPASITAS TAS SEKOLAH ANAK BERBASIS MIKROKONTROLER

2020 ◽  
Vol 1 (1) ◽  
pp. 14-22
Author(s):  
Novia Utamu Putri ◽  
Putri Oktarin ◽  
Risky Setiawan
Keyword(s):  
Elementary School ◽  
Elementary School Students ◽  
School Children ◽  
Input Voltage ◽  
Wearable Device ◽  
School Students ◽  
Ac Current ◽  
Safe Limit ◽  
Dc Current ◽  
Made In

Backpacks are often used by school children as a container or a place to carry their school materials and equipment, so these types of backpacks are very popular with school children. The large number of students wearing backpacks to school can be proven from the results of a survey conducted at SD N Bumisari, Natar District, South Lampung. Of the total number of subjects, 456 elementary school students carried 404 students (88.6%), and 52 students (11.4%) carried sling bags. But they rarely pay attention to the weight of the burden on the bag he carries everyday which turns out to cause injury to back pain.The tool is made in the form of a wearable device where the tool is in the form of a backpack that can be carried anywhere without having to require AC current as input voltage to the tool, because the power uses DC current with a voltage of 5V, the device is made using a microcontroller supported by a 10 kg loadcell sensor, modules HX711, keypad, plus an indicator component in the form of a buzzer. If the bag load exceeds the safe limit, the buzzer indicator will sound.

Study on Defogging Effect Evaluation Method in Atomization Image

2014 ◽  
Vol 672-674 ◽  
pp. 1972-1976
Author(s):  
Zhen Chen ◽  
Fan Wu
Keyword(s):  
Evaluation Method ◽  
Evaluation Methods ◽  
Image Contrast ◽  
Effect Evaluation ◽  
Edge Structure ◽  
Evaluation Result ◽  
Relative Contrast ◽  
Overall Evaluation ◽  
Edge Similarity ◽  
Human Eyes

For the problems of few current defogging effect evaluation methods and limited evaluation methods, it proposes an image clarity effect evaluation method: the method combined with relative contrast and edge similarity. This is because: the contrast degree of fog image and non-fog image is obviously different. While improving image contrast degree, it should also try to make the edge structure of recovery image and reduced image consistent to prevent the recovery image from distorting. The experiment proves that this method can effectively evaluate the clarity effect of each algorithm, and the evaluation result and the subjective feelings of the human eyes are consistent. Compared with the existing evaluation methods, it obtains overall evaluation conclusion and also has a good practicability and reliability.

ILLUMINANCE DISTRIBUTION MEASUREMENT OF MUSEUM EXHIBITS USING DIGITAL IMAGING LUMINANCE METER

2021 ◽  
Author(s):  
A.A. Bartsev ◽  
A.A. Bartseva
Keyword(s):  
Digital Imaging ◽  
Measurement Method ◽  
Vertical Plane ◽  
Uncertainty Estimation ◽  
Experimental Uncertainty ◽  
Distribution Measurement ◽  
Museum Exhibits ◽  
Luminance Distribution ◽  
Museum Objects

The method for estimating the illuminance distribution in the vertical plane of museum objects (paintings) using a digital imaging luminance meters (ILMD) is considered. In order to pass from the luminance distribution to the illuminance distribution, a screen with reflective properties close to diffuse (Lambert) reflection is used. The theoretical and experimental uncertainty estimation of the measurement method done.

New Cathodic Protection Criteria Based on Direct and Alternating Current Densities Measured Using Coupons and Their Application to Modern Steel Pipelines

CORROSION ◽  
2004 ◽  
Vol 60 (3) ◽  
pp. 304-312 ◽  
Author(s):  
Y. Hosokawa ◽  
F. Kajiyama ◽  
Y. Nakamura
Keyword(s):  
Cathodic Protection ◽  
Field Tests ◽  
Alternating Current ◽  
Pipe Material ◽  
Review Of The Literature ◽  
Density Measurements ◽  
Corrosion Risk ◽  
Ac Current ◽  
Current Densities ◽  
Dc Current

Abstract The risks of alternating current (AC) corrosion, overprotection, and stray direct current (DC) corrosion are increasing on cathodically protected buried steel pipelines due to the recent changes in factors such as burial conditions, the characteristics of coatings, and pipe material. In the present study, field tests as well as a review of the literature on these risks were conducted. As a result, it has been revealed that there is a certain limitation to assess these risks with respect to conventional cathodic protection (CP) criteria based on pipe-to-soil potential. Therefore, new CP criteria for the elimination of these risks have been developed based on DC and AC current density measurements on coupons. The effectiveness of the new CP criteria was evaluated through the design of CP systems on newly constructed pipelines subject to the risks of AC corrosion, overprotection, and stray DC corrosion. Using these new CP criteria, the design and installation of CP systems as well as the elimination of these risks were completed successfully. The risks of overprotection as well as stray DC corrosion were eliminated by providing an appropriate level of DC current from CP rectifiers. The elimination of the AC corrosion risk was accomplished using distributed magnesium anodes and solid-state DC decoupling devices. Finally, the new CP criteria were proven to be effective in eliminating the risks of AC corrosion, overprotection, and stray DC corrosion on buried steel pipelines.

scholarly journals New Measurement Method and Uncertainty Estimation for Plate Dimensions and Surface Quality

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Salah H. R. Ali ◽  
Jariya Buajarern
Keyword(s):  
Surface Quality ◽  
Mass Production ◽  
Traditional Method ◽  
Edge Crack ◽  
Measurement Method ◽  
Large Scale ◽  
Production Control ◽  
Uncertainty Estimation ◽  
New Method

Dimensional and surface quality for plate production control is facing difficult engineering challenges. One of these challenges is that plates in large-scale mass production contain geometric uneven surfaces. There is a traditional measurement method used to assess the tile plate dimensions and surface quality based on standard specifications: ISO-10545-2: 1995, EOS-3168-2: 2007, and TIS 2398-2: 2008. A proposed measurement method of the dimensions and surface quality for ceramic oblong large-scale tile plate has been developed compared to the traditional method. The strategy of new method is based on CMM straightness measurement strategy instead of the centre point in the traditional method. Expanded uncertainties budgets in the measurements of each method have been estimated in detail. The capability of accurate estimations of real actual results for centre of curvature (CC), centre of edge (CE), warpage (W), and edge crack defects parameters has been achieved according to standards. Moreover, the obtained results not only showed better accurate new method but also improved the quality of plate products significantly.

Inductance Measurement for PMSM Using Instantaneous Flux Linkage Method

2014 ◽  
Vol 685 ◽  
pp. 393-396
Author(s):  
Yan Ling Cao ◽  
Ping Cao ◽  
Yan Dong Wen
Keyword(s):  
Steady State ◽  
Performance Analysis ◽  
Measurement Method ◽  
Decoupling Control ◽  
Flux Linkage ◽  
Control Torque ◽  
Torque Estimation ◽  
Linkage Method ◽  
Ac Current ◽  
Steady State Performance

The dq-axis inductances are important for the voltage decoupling control, torque estimation and steady-state performance analysis of a PMSM machine. In this paper, a measurement method is proposed based on the dq-axis instantaneous flux linkages calculation. The rotor is locked by a positive d-axis current, and then a proper AC current is assigned respectively to the d and q-axis reference current in order to cover the various current ranges. The instantaneous flux linkages are calculated by the integration of dq-axis current and voltage offline. Finally, dq-axis inductances are computed by the integrated flux linkages divided by the dq-axis current.

Current Induced Spin Injection in Si-MOSFET

2012 ◽  
Vol 190 ◽  
pp. 129-132
Author(s):  
I. Shlimak ◽  
A. Butenko ◽  
D.I. Golosov ◽  
K.J. Friedland ◽  
S.V. Kravchenko
Keyword(s):  
Magnetic Fields ◽  
Spin Injection ◽  
Dynamic Resistance ◽  
Experimental Scheme ◽  
Ac Current ◽  
Sample Resistance ◽  
Pass Through ◽  
Lock In ◽  
Dc Current ◽  
Parallel Magnetic Fields

Longitudinal resistivity in strong parallel magnetic fields up to B = 14 Tesla was measured in Si-MOSFET with a narrow slot (90nm) in the upper metallic gate that allows to apply different gate voltage across the slot and, therefore, to control the electron density n1 and n2 in two parts of the sample independently. The experimental scheme allows us to pass through the source-drain channel relatively large DC current (IDC), while the dynamic resistance was measured using a standard lock-in technique with small AC current. It was shown that the sample resistance is asymmetric with respect to the direction of DC current. The asymmetry increases with increase of magnetic field, DC current, and difference between n1 and n2. Results are interpreted in terms of a current-induced spin accumulation or depletion near the slot, as described by a spin drift-diffusion equation. The effect on the sample resistance is due to the positive magnetoresistance of Si-MOSFETs in parallel magnetic fields.

Intrinsic Phase Shift and Novel Dynamic Magnetization States of a Spin Torque Oscillator under ac Current Injection

2007 ◽  
Vol 998 ◽  
Author(s):  
Yan Zhou ◽  
Johan Persson ◽  
Johan Akerman
Keyword(s):  
Phase Shift ◽  
Phase Locking ◽  
Wave Length ◽  
Anisotropy Field ◽  
Spin Torque ◽  
Demagnetizing Field ◽  
Oscillation Modes ◽  
Out Of Plane ◽  
Ac Current ◽  
Dc Current

ABSTRACTWe report on a preferred phase shift ΔΦ0 between a spin torque oscillator (STO) and an ac current (Iac) injected at the intrinsic frequency (fSTO) of the STO. In the in-plane precession mode (IP) the STO adjusts to a state where its resistance (or voltage) lags Iac about a quarter of a wave length (ΔΦ0 = 87°−94°). In the IP mode ΔΦ0 increases somewhat with the dc current. As the precession changes into the Out-Of-Plane (OOP) mode, ΔΦ0 jumps by about 180°, i.e. the STO resistance now precedes Iac by about a quarter of a wave length (|ΔΦ0| = 86°). At the IP/OOP boundary, the ac current mixes the two oscillation modes and both periodic and chaotic oscillations are observed. As a consequence of mixing, subharmonic terms appear in the STO signal. ΔΦ0 can furthermore be tuned by changing one or more of the anisotropy field, the demagnetizing field or the applied field. At the IP/OOP boundary, Iac mixes the two oscillation modes. The intrinsic ΔΦ0 will impact any circuit design based on STO technology and will e.g. have direct consequences for phase locking in networks of serially connected STOs.

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