Testing

Learn from best practices within the industry, pre-testing considerations, troubleshooting tips, lessons-learned, and problem solving recommendations.

Health Monitoring and Prediction of Cells in a Battery Module or Pack Under Operating Condition

The state of health of cells in a battery pack under operating condition is difficult to obtain through existing IEC and ISO standard methods under laboratory conditions. However, a cell state of health (SOH) profile shall be able to establish by the comparison of electro-impedance spectroscopy (EIS) generated statically versus dynamic operating data retrieved by battery management system (BMS) communication interface as fragments of EIS.

Reducing Battery Life Risk in Mission Critical IoT Devices

The Internet of Things (IoT) is moving into more mission critical applications, especially with connected medical devices. Engineers can reduce the risk of premature battery failure by following the practical methods described in this article.

A Bias Tee for Broadband Measurement of Power Electronic Components

Bias tees are an important tool for many applications including vector network analysis. As accurate understanding and modeling of power electronic components becomes increasingly important for the study of their electromagnetic emissions, so do broadband measurements with bias tees. This paper describes the composition of such a special bias tee in terms of the necessary geometries and circuitry.

Users Guide to Hipot Testing

Hipot (“high potential”) electrical safety testers produce high voltage to perform dielectric withstand and insulation resistance tests. This article discusses the safety considerations and capabilities of modern hipot testers that utilize electronic source technology to assess compliance with IEC-61010.

Evolution and Analysis of EMC Specifications at a Major Automotive OEM

The history and insight into how the EMC specifications and procedures evolved at one automotive original equipment manufacturer (OEM). Other present-day OEM specifications are more similar than different mostly due to the extensive reference to international standards which these OEMs have taken part in developing (e.g., EMC committees). Knowing this history should help today’s EMC practitioners, especially those new to the discipline, gain some insight into the implementation and limitations of test procedures and when to be flexible in analyzing test results.

Conducted Emissions Feedback from VSD-Operated Products

The ubiquitous increase in the use of mains power switching devices has been paralleled by the increase in nuisance tripping of GFCIs and other protection devices. Nuisance tripping can be identified to contain such high frequency signals and these must be properly taken into account when designing proper GFCI operation in this environment.
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