This article analyzes the V-I characteristic of a varistor and shows it is more appropriate to treat the varistor as a current dependent resistance rather than the conventionally taught voltage dependent resistance. Spice circuit examples are given, based on a current dependent resistance varistor model.
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For engineers new to the field of EMC, the road can look very steep indeed. But, with a plan (and some work!), you can grow from EMC-novice to EMC-expert.
In this article the performance of the π and T filters is evaluated and compared to that of the CL and LC filters.
Controlled environment testing of static control flooring in combination with multiple forms of ESD footwear during the qualification phase can reveal problems and is a mandatory step to avoid installing non-compliant flooring/footwear systems.
Ever contemplated becoming a consultant? Living free of the corporate bureaucracy? Collecting those big fees? Traveling the world? But how does one get started anyway?
After the tragic 2003 Columbia re-entry accident, computational and experimental electromagnetics were ultimately applied to foster the development of a new NASA Ascent Debris Radar (NDR) for the remaining 22 Shuttle missions.
Direct Current (DC) applications have become more prevalent in recent years, primarily due to the increased usage of renewable energy and energy storage systems. A review of the existing safety standards and other literature shows that there is limited experimental data on DC human body resistance. In particular, no information was found by the authors describing the repeatability of DC body impedance and the effect of contact material and other variables.
Many electrical testing applications require a stable power source. Instead of having a custom design for each application, the programmable power sup... Read More...