Introduction Navigating the CE Mark process can be a challenge for both startups and experienced manufacturers alike. This article is a guide for hardware manufacturers who want to do all the right things to legally get their product into Europe. Here’s what we’re going to cover: The typical CE Marking process for electronic equipment Outline of the most common … [Read more...]
HDMI Cables and EMI
As more consumer and commercial products are introduced with High-Definition Multimedia Interface (HDMI) cable connections, the resulting EMI issues related to HDMI cable emissions have continued to be problematic for product designers and EMC engineers. It is very common to have one, or more, added HDMI cables cause a product to fail the radiated emissions (RE) test. The … [Read more...]
Troubleshooting ESD in Floating Medical Grade Circuits
Introduction Medical devices must be designed with proper isolation of patients from earth. For that reason all medical products have floating circuits. This means that the circuit ground is isolated from the earth ground. ESD protection in floating circuits with isolated grounds can be very challenging. Sometimes conventional ESD protection methods may not work. It is … [Read more...]
Summary of Commercial EMC Tests
Commercial EMC tests cover a wide range of products. These include the obvious ones like computers and their peripherals, but also cover household appliances, electric tools and a wide variety of other products. While the standards, including limits and test methods may differ, all EMC test standards have a few things in common. The most basic are the limits for emissions … [Read more...]
Summary of Military and Aerospace EMC Tests
Military and aerospace EMC tests cover a wide range of products. While the standards, including limits and test methods may differ, all EMC test standards have a few things in common. The most basic are the limits for emissions and the types and levels of susceptibility testing. Emissions tests (and their associated limits) are put in place for military and aerospace … [Read more...]
Get the Job Done – Pocket-Sized 20 MHz Wireless Oscilloscope
In photography, they say the best camera is the one you have with you. The same may be said for simple electronic test equipment. For example, I was recently working with a client and we needed to verify Vcc voltage on one of their boards. Not having a DMM quickly available in their lab, I pulled out a tiny DMM from my troubleshooting kit, no larger than a pack of cigarettes. … [Read more...]
Developing an In-House EMC Troubleshooting & Pre-Compliance Test Lab
While investing in your own full in-house EMC test laboratory may seem difficult to justify, most companies should be able to afford to implement some level of pre-compliance testing capability. Outside compliance test labs can cost upwards of $2,000 per day. The advantage of being able to perform some of the key tests in-house is that you can quickly determine whether your … [Read more...]
Review: EMC – Methods, Analysis, Circuits, and Measurement
Electromagnetic Compatibility - Methods, Analysis, Circuits, and Measurement, David Weston, CRC Press, 2017 (3rd edition) While I've reviewed many books on EMC, this one by David A. Weston, is the most complete in coverage yet. The 1157-page book covers not only basic and advanced theory of EMC, but includes product design, commercial and military measurement techniques, and … [Read more...]
2017 DoD E3 Program Review – After Action Report
By Brian Farmer on behalf of the DSO E3 Program Review Team After a five-year hiatus, the 2017 Department of Defense (DoD) Electromagnetic Environmental Effects (E3) Program Review was held April 3 - 7 at Lackland Air Force Base, San Antonio, TX. Over 60 technical presentations were delivered throughout the week, three working groups were convened, 12 exhibitors displayed … [Read more...]
The Importance of Layout in ESD Suppressing Diodes
ESD protection of sensitive electronics via transient voltage suppression (TVS) diodes is becoming a common circuit technique across industries. Signal lines in a circuit that are accessible to humans by touch (such as USB, HDMI, etc.) require ESD protection on all sensitive signal lines that are input to some IC’s. Placement of the ESD protection diodes on the circuit board … [Read more...]
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