Fundamentals

Resource articles covering basic electrical and compliance engineering concepts, theory and application, historical references, and general information.

There’s an “R” in “Varistor”

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.

Qualifying ESD Flooring

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.

So You Want To Be a Consultant?

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?

Experiments of DC Human Body Resistance I

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.
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