The last post examined CM radiation. Wow, what a problem! Over 100,000 microvolts/meter from a 3.5 ma signal. If the DM is normally the intended signal, where does the big common mode signal come from? Let’s take a look at that. The whole world seems to be enamored with high speeds. I know I could hardly wait to get a 1 GHz notebook. Did it help me … [Read more...]
What are the Slew Rates in Digital Circuits These Days and What Kinds of Frequency Spectra are Generated?
Editor's note: This question was asked in response to Interference Technology's recent webinar by Keith Armstrong. To view the webinar, click here. Question: What are the slew rates in digital circuits these days and what kinds of frequency spectra are generated? Answer: The slew rates of the digital signals generated by integrated circuits tend to increase as the silicon … [Read more...]
And The CM Currents Go Round and Round
When we were discussing green electron current (differential mode) in the last post, I mentioned that common mode (CM) currents (red electrons) are typically caused by unbalanced differential mode (DM) currents. It’s pretty easy to visualize that in an unbalanced differential transmission system, one of the traces is longer, has an extra via, needs a branch, the spacing … [Read more...]
Pulse Generator for Automotive EMC Test Systems
Teseq Inc., a developer of instrumentation and systems for EMC emission and immunity testing, has released the FT 5531 pulse generator for automotive EMC test systems. According to the company, the FT 5531 is an upgraded version of the TF5530 that offers improved accuracy and supports classic and modern testing standards. The FT5531 pulse generator features a 150 ns pulse … [Read more...]
Integrated EW Defense System Completes EMC Testing for Pakistan FMS Program
The Advanced Integrated Defensive Electronic Warfare Suite (AIDEWS) developed by defense contractor ITT Exelis has completed electromagnetic compatibility testing at Edwards Air Force Base in California. The company is contracted to produce more than 160 AIDEWS systems for six nations as part of the F-16 Foreign Military Sales program; the EMC testing at Edwards Air Force Base … [Read more...]
Philadelphia EMC Chapter Hosts Quarterly Meeting
On Tuesday, Nov. 13, Retlif Laboratories in Harleysville, Pa., hosted the Philadelphia EMC Chapter meeting. Mike Caruso (above) of ETS-Lindgren, based in Austin, Texas, discussed "EMP/HEMP - the threat and the solutions" with attendees. The talk … [Read more...]
Basics on Designing for EMC Compliance
Paul Lee Director of Business Development Murata Power Solutions, Milton Keynes, UK Electromagnetic interference (EMI) is the bane of many an engineer and of designs that must adhere to international and national regulations regarding electromagnetic compatibility (EMC). However, there are numerous techniques that can be applied to reduce both the emissions from and … [Read more...]
Immunity Tester for Use in EMC Testing Laboratories
Impulse test equipment supplier EMC-Partner has released the IMU3000 Immunity Tester for testing applications in EMC laboratories. According to the company, the IMU3000 provides the ability to “extend test capability with on-side upgrades, reduce service costs and increase system availability.” IMU3000 covers all international standards and combines surge voltages up to 8kV … [Read more...]
Testing Requirements for EMC-Unprotected Test and Measurement Circuits
IEC 61326-2-1:2012 specifies detailed test configurations, operational conditions and performance criteria for equipment with test and measurement circuits that are not EMC-protected for operational and/or functional reasons as specified by the manufacturer. This second edition constitutes a technical revision and cancels and replaces the first edition published in 2005. Learn … [Read more...]
Former IEEE EMC Society President Passes Away
Edwin Lee Bronaugh, former president of IEEE, born in Salina, Kansas on July 22, 1932, died Oct. 18, in Austin, Texas. He was 80. Bronaugh was born July 22, 1932 in Salina, Kan. to Edwin and Violet Mary Bronaugh. He married Geraldine Kelley, Dec. 10, 1955. He received a bachelor's degree in physics and mathematics from East Texas State University (now Texas A&M … [Read more...]
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