(Re)Discovering the Lost Science of Near-Field Measurements, Part 4

This is the fourth and final article in our series commemorating 70 years since the advent of modern EMC testing. This last installment discusses the theoretical misunderstandings that arise from the substitution of field intensity for antenna-induced concepts and illustrates the practical outcomes from these theoretical mistakes.

(Re)Discovering the Lost Science of Near-Field Measurements, Part 2

This article is the third in a series commemorating 70 years since the advent of modern EMI testing. But this last article is itself divided into multiple parts, due to the topic’s complexity. Unlike the previous two articles, which mainly tracked evolution and explained issues, this series of installments argues that we started off correctly seventy years ago, but then took the wrong fork in the road in 1967.

(Re)Discovering the Lost Science of Near-Field Measurements – Part 1

This article is the third in a series commemorating 70 years since the advent of modern EMI testing. But this last article is itself divided into multiple parts, due to the topic’s complexity. Unlike the previous two articles, which mainly tracked evolution and explained issues, these next installments argue that we started off correctly seventy years ago, but then took the wrong fork in the road in 1967.

Kilograms, Amperes and Kelvins, Oh My

Just when you thought that some things were forever immutable, now comes word that the definitions of some critical weights and measures will soon be changed. According to a report posted to Science Daily we... Read More...

Do Measurements Validate Simulations?

It is very common for people doing simulations to make a measurement of a similar set up to validate the simulation. This is a reasonable precaution since modern simulation tools will give a very accurate answer to whatever question it is asked.

Site Attenuation Measurements Using External Source Control

A method of determining the performance of an open area test site (OATS) or an anechoic chamber is to perform a site attenuation measurement. The process used is to step a signal source at the transmitting antenna and use a receiver or spectrum analyzer at the receiving antenna. The two are stepped together to give a set of data that shows the performance of the test site or chamber. ANSI C63.4 outlines the process for performing normalized site attenuation (NSA) measurements. In these measurements, the spectrum analyzer controls the signal source.