Sound Transit and the University of Washington are working out a $43 million deal to move some of the university’s labs across campus, in order to avoid interference caused by an underground light rail tunnel. The lab buildings in question contain very precise and sensitive equipment, such as electron microscopes, that are extremely vulnerable to electromagnetic interference. … [Read more...]
Shielded Test Boxes for R&D, Quality Control and Wireless Coverage Testing
Select Fabricators has introduced new lightweight, collapsible RF shielding boxes designed to facilitate better testing of wireless devices for R&D, manufacturing quality control and coverage testing for cellular carriers. Ideal for use by electronics testing laboratories in the commercial and industrial wireless, automotive, aerospace and defense industries, the new … [Read more...]
Study Finds No Danger from Magnetic Fields in Electric Vehicles
An international study has concluded the electromagnetic radiation produced by the electric motors powering hybrid, plug-in hybrid, all-electric and hydrogen fuel cell cars to be harmless to passengers inside the vehicles. The EU-funded study, led by Norwegian independent research organization SINTEF, looked at the intensity of magnetic fields in seven electric cars, one … [Read more...]
EMI Shielding Compounds for Automotive Radar and Sensing System Components
Thermoplastics compounder RTP Company has developed new EMI shielding compounds ideal for replacing metal or conductive coated plastic housings in automotive sensing systems. Automotive radar and sensing systems designed to maintain vehicle safety and reliability require EMI protection to eliminate “noise” that could interfere with signal processing, the company says. As the … [Read more...]
Software for Installed Antenna Analysis Receives Update
Delcross Technologies has announced version 4.0 release of its Savant software for modeling the installed performance of antennas on electrically large vehicles. New features in this release of Savant include multi-bounce edge-diffraction rays that improve accuracy by modeling antenna interactions with shadowed portions of the platform, an integrated workflow with CST STUDIO … [Read more...]
Elephant in the Test Room #2 Continued and The Design Guide Article
Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]
A Design Review of the Automotive Radiated Emissions Test Fixture
Tom Mullineaux RF Engineer From a cold, dispassionate RF engineering perspective, the automotive radiated test set-up is a strange looking transmit/receive arrangement, with the cable harness of the equipment under test (EUT) suspended above a large copper sheet acting as the transmitter, and a huge antenna close to the chamber floor, and partly in the shadow of the copper … [Read more...]
UPDATE: Toyota Documents Show EMI as Possible Root of Sudden Acceleration Problem
UPDATE March 19, 2014 The U.S. Justice Department announced Wednesday that Toyota Motor Corporation will pay $1.2 billion to settle a criminal probe into whether the automaker handled reports of safety issues in its vehicles properly. The agreement ends a four-year investigation into sudden unintended acceleration complaints dating back to the late 2000s. The issue first … [Read more...]
Inexpensive Radiated Immunity Pre-Compliance Testing
As an EMC consultant, it seems that lately I’ve run into many client projects where radiated immunity has cropped up as the major issue. One reason for this may be the trend in using digital and analog circuits that are powered by 3.3 volts, and lower, which decreases noise margins significantly. Sensitive analog circuitry is also greatly affected. The compliance testing for … [Read more...]
Training the Intern and Elephant in the Test Room #2 Continued
Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]
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