TWT Amplifiers Meets Demands HIRF EMC Testing in Commercial AircraftA series of new high-power, pulsed TWT (traveling wave tube) instrumentation microwave amplifiers has been introduced by UK-based TMD Technologies, Ltd. These amplifiers have been optimized to meet the latest stringent demands of high intensity RF (HIRF) EMC testing. The PTC6000 and the PTC7000 TWTAs between … [Read more...]
New CISPR EMC Standard for Household Appliances and Electric Tools
CISPR 14-1 Consol. Ed. 5.1 applies to the conduction and radiation of radio-frequency disturbances from appliances whose main functions are performed by motors and switching regulating devices, unless the radio-frequency energy is intentionally generated or intended for illumination. It includes such equipment as household electrical appliances, electric tools, regulating … [Read more...]
US and UK Shielding Firms Embark on Joint Venture
Braden Shielding Systems USA and Rainford EMC Systems UK have announced that they have entered into a joint venture for technology transfer and cooperative sales and marketing strategies of their respective medical MRI and EMC anechoic chamber product lines. Now Rainford, with an extensive shielding capability and support structure in Europe and Asia, will provide Braden’s … [Read more...]
Certification Programs: What’s Behind the Terminology?
A well-defined and structured certification program is vital to assuring product quality and safety Randy Ivans, Underwriters Laboratories Inc. Melville, NY The Merriam-Webster® Dictionary defines “certify” as “to attest authoritatively, to confirm, to present in a formal communication, or to attest as being true.” Consider the implications of these words and phrases—confirm, … [Read more...]
Achieving More Accurate Measurement of Conducted RF Emissions Using Modified AMNs
Measurement uncertainty for common-mode disturbances can be reduced from about 22 dB to a maximum of a few dB Mart Coenen, Philips Applied Technologies Eindhoven, the Netherlands Introduction In early 1980, extensive discussions were held within the IEC CISPR/A working group regarding the definition of the impedance characteristics and the RF emission limits attained via the … [Read more...]
Lithium-zinc Ferrite for the Suppression of Electromagnetic Noise
Studies show that Li-Zn ferrites can successfully suppress EMI N.C. Joshi, S.S. Islam, Ph.D., Jamia Islamia University Jamia Nagar Anjali Verma, Ph.D., Indian Institute of Technology New Delhi, India Recent technological development has been characterized by an unprecedented proliferation of digital technology in information and communications equipment. The worldwide … [Read more...]
Building a State-of-the-Art 5-Meter Chamber
An efficient shield room for automotive testing progresses from design to finished structure Michael Koffink, Bob Mitchell Intertek ETL Semko Littleton, MA Four years ago, we noticed a growing demand for EMC testing from the automotive industry. As cars and trucks now feature myriad on-board electronic devices, they are increasingly susceptible to stray emissions while … [Read more...]
Reverberation Chamber for EMC Testing
The reverberation chamber provides the most realistic simulation/equivalency for electronics functioning within a cavity Er-Ping Li, Ph.D.; Xing-Chang Wei, Ph.D., Electromagnetic Labs, Singapore National Institute of High Performance Computing Singapore Introduction The problem is familiar, but growing. The widespread and ever-growing use of electronic devices with high-speed … [Read more...]
Expanded Amplifier Line Delivers Reliable Performance in Demanding Environments
Five new broadband power amplifiers from Teseq operate from 0.8 GHz to 3.1 GHz and from 2 GHz to 6 GHz with power levels ranging from 30 W to 450 W. Three Class A models are based on gallium arsenide (GaAs) integrated circuit (IC) technology and offer significantly better compression characteristics and increased efficiencies than earlier silicon-based low power amplifiers. The … [Read more...]
Enclosure Suppresses EMI in Military Airborne Configurations
A highly ruggedized system enclosure from One Stop Systems (OSS) targets military and airborne applications. Constructed of solid seam-welded aluminum, the 11U high enclosure measures 19″ (H) x 25″ x 17″ (W) and weighs 56 pounds. It contains a 3U 15-slot CPCI backplane and features a “floating card that sits within the enclosure and is surrounded by four banks looped cable … [Read more...]
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