Dentro del marco establecido por el Programa de Metrología Legal del INTI, el Centro de Electrónica e Informática cumple el rol de laboratorio de verificación y validación de equipos electrónicos como parte del proceso de ...
Vasconcellos, Renata Teixeira de Barros e; Ihlenfeld, Waldemar Guilherme Kurten(2015)
Here we will present measurement results for ac resistors calibrations, made with a four terminal-pair digital impedance bridge, developed at Inmetro. This bridge operates in a wide frequency and value ranges, for both ...
This paper presents the calibration procedure for “on-site” high voltage instrument transformers and high current instrument transformers. In many countries, high voltage energy networks flows are monitoring by using Phasor ...
Yasuda, Eliana; Di Lillo, Lucas; Kyriazis, Gregory Amaral(2015)
En el presente trabajo se presentan los avances en el desarrollo, diseño y construcción de shunts de corriente desde 20 mA a 100 A. Los mismos serán utilizados como acondicionadores de señal de un nuevo sistema de medición ...
This work shows the state of development of resistive voltage dividers for use in a standard wattmeter that covers a frequency range from 50 Hz to 100 kHz. The voltage ranges go from 4 V to 1024 V, with required accuracy ...
Se describe el desarrollo de un método para la calibración de transformadores de medida de corriente mediante la comparación directa con transformadores de referencia patrones utilizando un comparador de corriente de alta ...
This paper shows a comparison between two different approaches to build micropotentiometers (µpots) for AC-DC transfer measurements at low voltages. An overview of µpots is presented, and two different approaches to build ...
En este trabajo se describe un sistema detector de frecuencia para medir directamente la base de tiempo del cronómetro por el método de inducción y de esta forma realizar la calibración de cronómetros digitales con una ...
This work present the development of a new system, based on open source technology, for the automation of DC resistor calibration. The new system is webbased, stores the measurement registers on a structured database and ...
Fortaleza, Leonardo Gouvêa e Silva; Barbosa, Carlos Roberto Hall; Monteiro, Elisabeth Costa; Silva, Eduardo Costa da; Gusmão, Luis Antonio Pereira de(2015)
The location of non-magnetic foreign bodies in patients, such as firearm projectiles, for surgical removal purposes is a major challenge that leads to often unsuccessful hours-long extraction procedures. This paper presents ...
Amaral, Kyriazis, Gregory; Di Lillo, Lucas; Slomovitz, Daniel; Iuzzolino, Ricardo; Yasuda, Eliana; Trigo, Leonardo; Laiz, Héctor; Debatin, Rosane Moreira; Franco, Ana Maria Ribeiro(2015)
Three countries in South America are jointly developing a reference system for measuring electric power up to 100 kHz. The objective is the construction of three similar measuring systems, one for each institute. The ...
Tenório, Hugo César Rocha Libório; Vieira, Débora Albuquerque; Souza, Cleonilson Protásio de; Freire, Raimundo Carlos Silvério(2015)
Thermoelectric Modules (TEM) are solid-state devices designed for energy conversion that can operate either as an electrical generator or as a cooling/heating device. This paper presents a measurement system for evaluating ...
Ihlenfeld, Waldemar Guilherme Kurten; Vasconcellos, Renata Teixeira de Barros e(2015)
The paper describes the design of a four-terminal-pair impedance bridge developed at INMETRO. Originally devised to work as a quadrature bridge for deriving the unit of capacitance (Farad) from a resistance (Ohm) or ...
The increase of distorted loads and non-conventional generation has led to limit the harmonic distortion in power networks. However, current instrument transformers (CT) are usually designed and tested only at power ...
Silva, Márcio Cândido da; Carvalho, Hélio Ricardo; Vasconcellos, Renata Teixeira de Barros e(2015)
This paper presents a comparison results between the Quantum Hall System (QHS) under development at the Quantum Electrical Metrology Laboratory (Lameq) and the current comparator calibration system, traceable to the Bureau ...
Kramar, Murilo Gabardo; Souza, Rafael Ukoski de; Machado Neto, Vicente(2015)
This paper describes the development of an electronic circuit capable of measuring capacitance within the range of 100 nF up to 1 mF, providing a reliable and affordable system. Measures had been taken and metrological ...
Several documents deal with software validation. Nevertheless, more are too complex to be applied to validate spreadsheets; surely the most used software in laboratories working under ISO/IEC 17025. The method proposed in ...
Vitorio, Patrícia C. de Oliveira; Lima, Vladimir Rodrigues de; Oliveira Filho, Orsino Borges de; Souza, Leonardo A. Abreu de; Asencios, Otto W. Ganvini(2015)
This paper refers to a project carried out in Inmetro aiming to provide internal metrological traceability for 60 Hz AC High-Voltage up to 40 kV. It presents details about the method used, its equations and obtained results. ...
Silva, Edgard de Macedo; Fialho, Walter Macedo Lins; Silva, Hícaro Felipe Brasileiro de Macedo; Leite, Josinaldo Pereira; Leite, João Pereira; Ventura, Antônio; Oliveira, Gonçalves de(2015)
Aços inoxidáveis duplex quando submetidos a temperaturas superiores a 600 ° C têm a sua tenacidade diminuída pela formação da fase sigma. Esta fase tem alta dureza e é rica em cromo e reduz a matriz desse elemento. Neste ...
Padilla, Rene David Carranza Lopez; Rodriguez-Guerrero, Marco Antonio; Montiel, Sergio Antonio Campos; Romero, Adrian de Jesus Castruita(2015)
Traceability of synchrophasors may be constrained to the measurement of reduced variations of frequency and amplitude; if the combined effects of amplitude or frequency modulation on the measurement results are not correctly ...