A technical session at the 2017 IEEE EMC+SIPI Symposium made it clear that EMI engineers will be constantly fixing interference problems as billions of wireless devices come online.
Near-field probes can help you find the source of emissions, but remember, not all fields propagate.
From a SPICE analysis, you can design filters that reduce EMI.
Arturo Mediano reports on products demonstrated at the 2016 IEEE EMC Symposium in Ottawa.
If you see emissions that you can't explain, look beyond for EUT to other equipment in the lab.
EMI scanners can display the spectral and special view of a circuit's emissions. From those plots, you can quickly see how circuit changes affect emissions.
Engineers will gather in Ottawa, Canada for the anual IEEE EMC Symposium. Here's what to expect.
The EMC Blog is back as Dr. Atruro Mediano begins to take engineers down the path to minimizing emissions and immunity.
Every manufacturer seemingly wishes to add some form of wireless capability into new and existing mobile, household, industrial, scientific, and medical product. This trend toward the “Internet of Things” is in full swing and with it comes problems with EMI. That is, EMI from the product itself, that interferes with sensitive telephone, GPS/GNSS, and Wi-Fi/Bluetooth receivers. This is called “platform interference” and it’s a big problem for manufacturers.
Rohde & Schwarz (R&S) recently released their new affordable handheld spectrum analyzer, the model FPH “Spectrum Rider”. We'll be reviewing this here.
Tekbox Digital Solutions recently introduced LISN models for both line-operated and DC-operated equipment. I’ll be reviewing their model TBLC08 (line-powered 50uH LISN) and model TBOH01 (DC 5uH LISN).
A set of near-field probes is an essential tool for troubleshooting EMI issues. Tekbox Digital Solutions has recently introduced a kit containing a set of three H-field, one E-field probe, and either a 20 or 40 dB gain broadband preamplifier. All this is included in a laser-engraved wooden box - a very nice touch. The probes may also be ordered without the preamplifier. I had a chance to try them out and compare with some similar probes.
Voltage standing wave ratio is a measurement of the impedance match of any RF component, sub-assembly instrument in reference to a standard 50-Ohm resistive impedance. This article discusses how to use the Rigol DSA815 to make this measurement.
How many times have you gone to reach for a particular coaxial adapter and failed to find the right one? Test Probes, Inc., now Test Products International (TPI) has two coaxial connector adapter kits and one of my colleagues traded an extra Model TPI 3000A kit for something I had that he needed. I’d like to describe this remarkable adapter kit.
Picotest has just introduced a very unique harmonic comb generator (Picotest calls it a harmonic injector) that’s not only designed to reveal resonances in power supply and voltage bus designs (power integrity), but also has interesting uses in EMC measurement and troubleshooting. It also has several unique features that really set it apart from all other comb generators.
The Siekoh Giken OEFS (Optical Electric Field Sensor) optically-coupled E-field probe is a very unique instrument. The company has developed a technology whereby the amplitude and frequency information from E-fields may be captured and transferred via optical fiber and reconverted to an RF signal. The optical fiber allows E-field measurements to be made non-invasively.
As mobile communications devices proliferate, the chance for interference to these systems, as well as to television, broadcast radio, and other communication systems increases. One important aspect of EMC is tracking down these interfering signals.
One of the more popular older ESD simulators was the KeyTek MiniZap. While rugged and easy to use, there are two common failures for this model - the NiCad batteries eventually won’t hold a charge and the two variable knobs at the top tend to crack. The knobs are easy to replace with standard set-screw knobs. This article describes how to replace the existing NiCad AA cells with new ones.
Suddenly, we seem to have a plethora of low-cost RF signal generators available for the RF experimenter and EMC engineer. Signal Hound has really raised the bar on these instruments with their new VSG25A vector signal generator, introduced recently at the International Microwave Symposium in Phoenix last May. I was able to get my hands on one to try out for potential EMC test applications.
While attending DesignCon 2015 last January, I had the chance to hear an interesting keynote presentation by Alex Lidow, CEO of Efficient Power Conversion, Inc., speak on the upcoming development in gallium nitride (GaN) technology for high-power switching devices. Because these devices switch at sub-picosecond speeds, there are EMI ramifications. This article evaluates a simple half-bridge DC-DC converter using GaN switching.