Some weeks ago I received one unit of the EMC-Filter kit from Würth Elektronik (Order Code: 744998), a very nice and useful kit for industry and academia (Fig. 1). Fig. 1. The EMC-Filter kit from Würth Elektronik (Order Code: 744998) If you are interested in filtering conducted emissions, this is a great kit for evaluation of components and topologies in both differential … [Read more...]
Substitution Source Measurements
In today’s EMC testing world testing is very often automated, using well calibrated test equipment. The operator sets up the EUT and support equipment, sets up the test equipment, fires up the software on the computer designed to automate the test, clicks on “Go” and sits back to watch the blinking lights. After a while the test is complete and a file is generated containing … [Read more...]
CALL FOR PAPERS: The 21st Annual DoD Electromagnetic Environmental Effects (E3) Program Review
CALL FOR PAPERS: The 21st Annual DoD Electromagnetic Environmental Effects (E3) Program Review will be held 07-11 May 2018 in Huntsville, Alabama, at the Westin Huntsville. Abstracts for the "General Sessions" are now being accepted. Abstracts should be no longer than one page. Abstracts should be submitted to disa.usna.os.mbx.e3coordinator@mail.mil. Twenty-minute timeslots … [Read more...]
Do your people really know how to perform a conducted emissions test to ANSI C63.4 or CISPR 32?
Oftentimes when a new person is hired to perform conducted emissions testing in a laboratory they know little about EMC and even less about how to perform a test. There is a training period where the new person learns how to perform a test using whatever software the lab has been using. The new person is well trained in how to perform the test with the automation working, … [Read more...]
EMI / EMC Issues in an Industrial Automation System
A discussion between Peter Thomas (PROFIBUS/PROFINET expert) and Keith Armstrong (EMC expert), in December 2017 Peter: Hello Keith. I have spent today visiting an industrial plant in the UK. Whilst there I took the opportunity to look at several areas from an EMI point of view. I wondered what you thought of the following: I list below a few observations following … [Read more...]
Do Not Miss the EMC+SIPI 2018 Symposium!
I am really happy because this is my first EMI/EMC blog for Interference Technology. I was invited by Ken Wyatt to contribute periodically and it was really difficult to reject that invitation. Definitely, I am happy. I hope to be able to include in this blog interesting information for all of you because I am sure the new year will come with many EMI/EMC activities, events, … [Read more...]
Call For Authors/Bloggers – Editorial Submissions to Interference Technology Magazine
In over 45 years of publication, Interference Technology has earned a reputation for publishing only the highest quality technical articles that focus on practical and innovative technological developments in the EMC, EMI, and RFI fields. Product designers and EMC/compliance engineers have come to rely on Interference Technology as a source of quality, unbiased, non-commercial … [Read more...]
Case Study: Poor PC Board Layout Causes Radiated Emissions
In this case study we're going look at some recent radiated emissions fault finding we performed for a customer. This highlights how one might go about the fault finding process, some of the considerations you might have when coming up with a solution, and how poor PCB layout can give you an emissions headache. Background A new customer discovered a radiated emissions problem … [Read more...]
Simulation in EMC
INTRODUCTION Digitization and the spread of pervasive computing is at the forefront of the technology innovation that will shape our modern universe and it is already manifesting itself in IoT, 5G and autonomous vehicle spaces, to name just a few areas. As this spread of technology increases, so does the need to regulate it – in terms of how these devices and systems … [Read more...]
Determining Semi-Anechoic Chamber Resonance as a Source of Radiated Emission Measurement Variation Between Chambers and Comparing to OATS Measurements
INTRODUCTION This article describes the lack of an acceptable correlation between anechoic chamber and open field test site radiated emission measurements, which were described in reference 1 in 2000, as well as a lack of correlation between chambers. It was found that emission measurements, which were over the limits in one facility, would pass in another. The lack of a … [Read more...]
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