Test & Measurement

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Noncontact 3D Characterization Using Confocal Laser Scanning Microscopy (CLSM)

Tomáš Zedníček Posted On 10.12.2018

Source: Alter Technology article

Modern manufacturing techniques depend on 3D measurement data combined with CAD/CAM techniques for quality control of high-precision components or mass production. Typically, contact measurement has been widely utilized by the industry. However, for complex and small 3D structures, the application of contact measurement is cumbersome or sometimes impossible. Therefore, non-contact measurement has gradually received much attention from researchers and industry.

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18 Views

All Applications / All Inductors / Basic Concepts Inductors / DC/DC Converters / e-PassiveBlog / Inductors / Test & Measurement / Transformers

Performing In-Circuit Inductor and Transformer Measurements in SMPS

Tomáš Zedníček Posted On 6.12.2018

Source: Electronic Design article

by Wilson Lee, Technical Marketing Manager at Tektronix.

Inductors and transformers serve key roles in switch-mode power supplies. Ensuring they perform as expected requires thorough in-circuit measurements performed under operating conditions. Here’s what you need to know.

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49 Views

Laser Machining of Multicapacitance filtering MLCC’s

Tomáš Zedníček Posted On 23.11.2018

source: Exxelia SAS, ESA SPCD 2018 Symposium

EPCI e-symposium library article

The aim of this work is the development of miniaturized filtering multilayers ceramic capacitors, single or multi capacitance, from various designs, circular miniaturizes shapes, or custom-design shapes. These special designs, for the most reduced dimensions, are only accessible by green machining of the MLCC’s. This step is one of the most critical in the MLCC’s manufacturing process, because every mistake can generate direct electrical defects or can lead to a reduced reliability of the parts.

published by EPCI under approval of ESA SPCD 2018 organizing committee.

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108 Views

Capacitors / editors choice / Inductors / Resistors / Test & Measurement

PCB Fixtures and Solder-wick trick to improve component measurements

Tomáš Zedníček Posted On 31.10.2018

Source: EDN article

Istvan Novak, PhD, Senior Principle Engineer at Oracle is in his three EDN articles [4], [5], [9] introducing some tips and tricks for own component measurementand PCB fixture preparation. (more…)

178 Views

Capacitors / e-PassiveBlog / Failure Analyses / Inductors / Reliability & Obsolescence / Resistors / Test & Measurement

Fluorescence Microscopy + dye penetrant test on EEE Parts

Tomáš Zedníček Posted On 1.10.2018

Source: Alter Technology article

by Francisco Javier Aparicio Rebollo
The Fluorescence Microscopy + dye penetrant test is a technique that combines two inspection methods commonly used for the detection of surface anomalies such as cracks, porosity, laps, delaminations, and other discontinuities. (more…)

154 Views

All Applications / Capacitors / e-PassiveBlog / Inductors / Resistors / Test & Measurement / Test and Measurement

Thermoreflectance Thermal Imaging as thermal characterization technique for components

Tomáš Zedníček Posted On 21.9.2018

Source: Alter Technologies article

Thermal image of components and its temperature map can be used for failure analyses, thermal process transients, or study of new materials. See more details in technical article published by Alter Technologies. (more…)

160 Views

Aerospace & Defence / Automotive / Capacitors / Industrial / Medical / Reliability & Obsolescence / Test & Measurement

Defects in High-Voltage Ceramic Capacitors Found Acoustically

Tomáš Zedníček Posted On 2.2.2018

source: Power electronics article

Acoustic imaging of high-voltage ceramic chip capacitors performs a non-destructive cross section through the capacitor—or, since the method is non-destructive, as many cross sections as desired. All of the imaging modes have the same purpose: to prevent flawed capacitors from causing field failures. (more…)

338 Views

Capacitors / e-Symposium / Reliability & Obsolescence / Test & Measurement

Temperature Dependence of Leakage Current Degradation of Tantalum Capacitors at High Electric Field

Tomáš Zedníček Posted On 20.10.2017

source: Brno University of Technology CEITEC, AVX Czech Republic s.r.o., EPCI e-Symposium

Abstract:

Tantalum capacitors have been the preferred capacitor technology in long lifetime electronic devices thanks to the stability of its electric parameters and high reliability. However, long time application of elevated temperature and high electric field can result in capacitor leakage current increase in time. In this paper the effect of ions drift and diffusion at different temperatures on DCL degradation is analysed.

DCL vs. time characteristics at temperatures from 65degC to 155degC were studied in order to determine the parameters of leakage current ageing. Results for four technologies are presented and it is shown that capacitor technology has crucial impact on DCL vs. time characteristics.

These experiments are used to determine the background temperature at which DCL degradation starts with respect to the value of electric field. There exists background temperature under which the thermal excitation is not sufficient for give rise to the ions movement. This background temperature is higher than 105degC for technology IS4 while for technology IS3 this temperature is 65degC only.
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374 Views

e-Symposium / Industrial / Materials / Sensors / Technology / Test & Measurement

Carbon Nanotubes Ammonia Sensor Printed by Aerosol Jet System

Tomáš Zedníček Posted On 20.10.2017

source: RICE, FEE, University of West Bohemia in Pilsen, EPCI e-Symposium

Abstract:

This article deals with ammonia gas sensor based on carbon nanotubes. Active layer is deposited on a flexible substrate by new deposition technique called Aerosol Jet.

The deposition technique remove deficiency of today’s common used deposition technique, where it is very difficult to deposit a thin homogeneous layer of carbon nanotubes. The final sensor was tested against to 50 ppm ammonia concentration at the room temperature. The electric parameter changes of the sensor during the testing was measured by AC LRC bridge and achieved results are discussed.

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373 Views

Capacitors / Consumer / e-Symposium / Inductors / Materials / Technology / Test & Measurement

Printed and Embroidered Electronic Passive Components

Tomáš Zedníček Posted On 20.10.2017

source: RICE, FEE, University of West Bohemia in Pilsen, EPCI e-Symposium

Abstract:

Wearable electronics and smart textiles is rapidly developing area currently. An integration of electronic components and systems directly on/into textile substrates leads to the development of promising new technologies among which it is possible to include printing of passive electronic components and/or embroidering of passive electronic components directly onto textile substrates using conductive threads.

The paper deals with comparing of the electrical parameters of printed and embroidered planar passive electronic components. Different types of planar inductors and interdigital capacitors were designed and realized. Their basic electrical parameters such as nominal values and resonance frequencies were measured and compared each other. Presented results can be used for the realisation of functional printed or embroidered components and systems designed not only for smart textiles.

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464 Views