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EMI/EMC/RFI

Phone chargers produce EMI: We compared four

April 15, 2025 By Martin Rowe Leave a Comment

Four chargers USB

The switching power supplies that regulate output voltage produce radiated emissions. Our tests compare waveforms that give clues as to how the chargers operate.

Filed Under: EMI/EMC/RFI, FAQ, Featured, oscilloscope measurements, Power supplies Tagged With: Anker, Apple, JBL, UNI-Trend

APEC 2025 test equipment: oscilloscopes and probes

March 24, 2025 By Martin Rowe Leave a Comment

oscilloscope and probes in power electronics

Oscilloscopes and probes play a vital role for engineers designing and testing power electronics. Delivering electrical power to analog and digital circuits and systems is more than just DC measurements. That’s because nearly all power-converter circuits use switching techniques to maximize efficiency. Silicon carbide (SiC and gallium nitride (GaN) transistors, with their higher voltage and […]

Filed Under: Digital Oscilloscope, EMI/EMC/RFI, Featured, Meters & Testers, Power supplies, Video Tagged With: cleverscope, keysighttechnologies, rohdeschwarz, Tektronix, teledynelecroy, Yokogawa

Why engineers need IC ESD and TLP data

March 17, 2025 By Jeffrey C. Dunnihoo, Pragma Design Leave a Comment

Design Engineers need ESD and TLP characterization data to make informed decisions to design robust circuits and systems. Engineers often review semiconductor data among several manufacturers when designing a circuit or system. While two or more ICs may perform satisfactorily under normal operating conditions, they may not perform the same under extreme conditions, such as […]

Filed Under: EMI/EMC/RFI, FAQ, Featured, Featured Contributions, semiconductor test Tagged With: FAQ

EMI from LED light fixture often exceeds regulatory limits

February 5, 2025 By Kenneth Wyatt Leave a Comment

Conducted emissions from LED light fixtures at frequencies from 1 MHz to 30 MHz can interfere with amateur radio and several broadcast bands. Radiated emissions reach into the lower cellular bands. After recently moving to northern Colorado and setting up my EMC lab and amateur radio station in the basement, I wanted to update the […]

Filed Under: EMI/EMC/RFI, FAQ, Featured, spectrum analyzer Tagged With: Fischercustomcomm, siglenttechnologies, tekbox, WurthElectronik

Review: Tekbox TBCG4 harmonic comb generator

January 2, 2025 By Kenneth Wyatt Leave a Comment

Tekbox TBCG4 harmonic comb generator

The Tekbox TBCG4 harmonic comb generator produces a wide range of known frequencies for EMC immunity testing and routine checking of EMC chambers. I’ve used harmonic comb generators for decades in various applications, including antenna measurements, cable resonance measurements, and shielding-effectiveness testing. I also find them useful for checking the daily consistency of test chambers […]

Filed Under: arbitrary waveform generators, Digital Oscilloscope, EMI/EMC/RFI, FAQ, Featured, PC-based spectrum analyzers, Tryouts and Reviews Tagged With: rohdeschwarz, Siglent, tekbox

Free and low-cost online EE tools aid in design

December 23, 2024 By Kenneth Wyatt 2 Comments

Qucs schematic circuit

Downloadable and online free and low-cost EE tools help engineers design and analyze circuits.

Filed Under: Design, EMI/EMC/RFI, FAQ, Featured, spectrum analyzer Tagged With: analogdevices, keysighttechnologies, rohdeschwarz, WurthElectronik

How can EMI be weaponized?

December 11, 2024 By Jeff Shepard Leave a Comment

Electromagnetic interference (EMI) can be an unwanted and disruptive aspect of electronic system designs. It can also be amplified and weaponized. EMI is being weaponized in purpose-built high-power microwave (HPM) tactical systems that devastate electronics without the side effects of physical destruction. The initial weapons have been deployed, and a roadmap has been outlined for […]

Filed Under: EMI/EMC/RFI, FAQ, Featured Tagged With: FAQ

Controlling EMI and improving sustainability

December 10, 2024 By Jeff Shepard Leave a Comment

Optimized designs require less electromagnetic interference (EMI) shielding and other materials, improving sustainability. Improved EMI performance extends system life and reduces e-waste, further enhancing sustainability. More sustainable shielding materials are being developed for use when shielding is required. This article reviews the basics of EMI, examines common shielding materials to provide a baseline for comparing […]

Filed Under: EMI/EMC/RFI, FAQ, Featured Tagged With: FAQ

Download our 2024 T&M Tech Toolbox

November 11, 2024 By Martin Rowe Leave a Comment

Keysight 14-bit oscilloscope

Everything needs testing and testing needs measurement. That’s why we assembled a collection of articles from Test & Measurement Tips into the 2024 T&M Tech Toolbox, a 56-page e-book in PDF format. We took some of the top articles from our recent archives to provide you with information that can help you with your job. […]

Filed Under: EMI/EMC/RFI, Featured, Meters & Testers, New Articles, Oscilloscopes

New products at the EMC & Compliance International Conference

July 8, 2024 By Kenneth Wyatt Leave a Comment

At the annual UK event, Tekbox, Y.I.C. Technologies, and Harogic Technologies were among the companies exhibiting new EMC measurement equipment. The EMC & Compliance International conference and training was held again in Newbury, UK, from May 22 to 23 this year (Reference 1). This was my first opportunity to attend this annual conference hosted by […]

Filed Under: EMI/EMC/RFI, FAQ, Featured, PC-based spectrum analyzers, spectrum analyzer, vector network analyzers

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