What is electricity, really?
12 Apr 2024
Author: Keith Armstrong
Keith’s 79th Blog This is original material was created entirely by a human, on 2nd April 2024 Question: Hi Keith, I have a question and maybe it’s not an easy one... After r...
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In our day to day business we come across many situations where we can provide solutions to EMC Problems, often just by giving some advice or guidance.
In our blog, we will pass on some of this hard won experience, with the hope that you may find the answer to an issue that you have been experiencing.
All the very best!
Keith Armstrong
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Place TVSs before, or after, EMI filters?
03 Apr 2024
Author: Keith Armstrong
Keith's 78th Blog This is original material was created entirely by a human, on 2nd April 2024 Question: Hi Keith, I have attended several of your webinars and courses, and re...
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No tests are required for CE-marking to the EMCD
02 Jan 2024
Author: Keith Armstrong
Keith’s 77th Blog This is original material created entirely by a human on 29th December 2023 I couldn’t believe my eyes when I saw a recent article falsely claiming that EMC ...
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Risk Assessment for EU and UK Compliance
13 Nov 2023
Author: Keith Armstrong
Manufacturers Authorised Representatives Importers Distributors Since 2016, manufacturers of products [1] declared compliant with ‘CE-marking’ EU Direct...
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Measuring the Fmax of Integrated Circuits
02 Nov 2023
Author: Keith Armstrong
A great deal of good, quick, cost-effective EMC design depends upon the highest frequency at which ICs can cause EMC problems, which is constantly increasing due to developments in...
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Where best to place CM chokes on VSD motor cables?
11 Sep 2023
Author: Keith Armstrong
Where best to place CM chokes on VSD motor cables? Most EMC guidance says Common Mode (CM) Radio Frequency (RF) noise suppression chokes should be placed around the outside of shi...
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We are all human!
11 Sep 2023
Author: Keith Armstrong
Correcting an error in my 2009 article on Shielding (screening) Naseer Ahmad just alerted me via Linked In (https://www.linkedin.com/in/keith-armstrong-449801172/) to an error in ...
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Why Chat GPT, AI, and ML are so dangerous, has been known for decades
03 May 2023
Author: Keith Armstrong
Chat GPT, AI, ML, etc., are now using digital systems in almost every possible application. Not just cars, trucks, trains, planes, surgery – where safety implications are obvious...
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CISPR Emissions Limits are no use to System Integrators or Installers
29 Mar 2023
Author: Keith Armstrong
[1] below reminded me that the emissions limits in the CISPR standards, and the IEC/EN standards that use them, assume: A single interferer being present, for no longer than 8 h...
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A question on shielding with plain aluminium
02 Feb 2023
Author: Keith Armstrong
Question: Do you think it would be reasonable to create an RF/EMI shield out of plain aluminium, where the flanged box lid (yellow in the image below) and its baseplate (blue) are...
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Exporting to the EU, and/or to the UK
05 Jan 2023
Author: Keith Armstrong
Manufacturers and other product suppliers based outside the EU must create specified ‘Technical Documentation’ for the CE-marked products they export into the EU, to demonstrat...
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Saving time and money with good EMC Design
26 Sep 2022
Author: Keith Armstrong
Saving time and money with good EMC Design — or — The financial benefits of using good EM Engineering All products and services now depend upon the correct operation of elec...
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Legal requirement for EM resilience for electronic products?
06 May 2022
Author: Keith Armstrong
Is there any legal European Directives/Standards that require EM safety risk management for general electric/electronic products such as audio/video, multimedia, household, lightin...
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How to overcome challenges with EMC compliance
25 Apr 2022
Author: Keith Armstrong
Since the new EMC Directive came into force in 2016, EMC experts have often found themselves needing to apply test standards they are unfamiliar with, and which are not harmonised ...
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Interesting Question about plastic enclosures and EMC
28 Mar 2022
Author: Keith Armstrong
My recent discussion with Robert Ferenec about designing PCBs, especially with regard to EMC, see it here, resulted in lots of questions! One of the more interesting was: 'What ...
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What Spacing Between LVDS Harnesses Running at Different Voltages?
10 Mar 2022
Author: Keith Armstrong
What Spacing Between LVDS Harnesses Running at Different Voltages? Question: I read your 30/fmax and 3/fmax theory for cable EM ZONE/ RF reference plane theory (e.g. 30mm for a...
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What's in a Name?
01 Mar 2022
Author: Keith Armstrong
What's in a Name? I'm always battling against engineers and their managers who think that calling a conductor a different name makes it behave differently. So, they assume that a...
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We Can't Fully Test Digital Systems
03 Feb 2022
Author: Keith Armstrong
Why can’t we manage Functional Safety risks that can be caused by EMI, by immunity testing? There are at least three reasons, but in this blog I want to deal with just one of th...
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The Whole Product Must be Tested
23 Dec 2021
Author: Keith Armstrong
The Whole Product Must be Tested Question: I would like to ask for your expert advice regarding testing an Emergency Batten for 61000-3-2. The Emergency Batten contains, EM Contr...
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SPCs and Safety
16 Dec 2021
Author: Keith Armstrong
SPCs and Safety Metal Oxide Varistors, or MOVs (sometimes called VDRs, for Voltage Dependent Resistors, or just plain Varistors) are a low-cost component used for surge and transi...
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