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Kenneth Wyatt

Characterize EMI from dc-dc converter ringing

April 7, 2025 By Kenneth Wyatt Leave a Comment

Switching power supplies produce radiated and conducted emissions caused by ringing. Oscilloscope and spectrum-analyzer measurements let you see them. DC-DC converters are ubiquitous in most electronic products. While more efficient than linear regulators, they can also produce considerable amounts of interference that can affect nearby circuits. The measurements in this article show how ringing occurs […]

Filed Under: Analyzer, EV Engineering, FAQ, Featured, oscilloscope measurements, spectrum analyzer Tagged With: micsig, siglenttechnologies, TekboxDigitalSolutions

Review: Micsig TO3004 tablet oscilloscope

March 26, 2025 By Kenneth Wyatt Leave a Comment

If you’re looking for a portable oscilloscope for field troubleshooting or for demonstrations, look at the Micsig TO series. Here’s my take on the four-channel 300 MHz variant, TO3004. The Micsig TO3004 oscilloscope (Figure 1) is an 8-bit, four-channel, tablet-sized portable oscilloscope that’s also available with 100 MHz and 200 MHz varieties with two or […]

Filed Under: Digital Oscilloscope, Digital Storage Oscilloscope, FAQ, Featured, Oscilloscopes, scope probes and accessories Tagged With: FAQ, micsig, Saelig

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: PCBite circuit board holder and probe kit

January 24, 2025 By Kenneth Wyatt Leave a Comment

The PCBite kit holds your circuit board in place while you probe it, reducing the risk of short circuits. Recently, I’ve had to test and characterize many small PC boards, including embedded processors, DC-DC converters, and other wireless-related products, for EMC issues. I’ve never really had an easy way to keep these boards from moving […]

Filed Under: FAQ, Featured, oscilloscope measurements, Oscilloscopes, scope probes and accessories, Tryouts and Reviews Tagged With: Picotest, rohdeschwarz, Saelig, Sensepeak, Telonic

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

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

Spectrum measurements shed light on sign malfunctions

April 22, 2024 By Kenneth Wyatt Leave a Comment

Interference in the 900 MHz band appears to produce random errors in a gas station price sign. Spectrum analyzers help track it down. I received a call recently from a former client who manufactures electronic signs. A gas station was experiencing intermittent loss of wireless control of its signs, which displayed the price of various […]

Filed Under: EMI/EMC/RFI, Featured, spectrum analyzer, wireless, wireless test equipment Tagged With: FAQ

How to separate differential and common-mode harmonic noise currents

February 23, 2024 By Kenneth Wyatt Leave a Comment

Differential-mode and common-mode currents can cause your product to produce radiated and conducted emissions. These three techniques can help you measure them.

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

Review: Electronic bug and hidden camera detectors

January 30, 2024 By Kenneth Wyatt 1 Comment

Hidden spy cameras

Do you want assurance that cameras embedded in everyday devices don’t spy on you? Then you should check for cameras, SD card slots, and Wi-Fi-connections. We reviewed two devices that help you find those lurking spies. While discovering a hidden camera in an Airbnb, VRBO, or hotel is rare, there have been reports of travelers […]

Filed Under: FAQ, Featured, Machine Vision/Inspection, signal generator Tagged With: FAQ

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