Electronics Protection - March/April 2012 - (Page 16)

EMI/EMC/ESD New Circuit Board Shielding from Leader Tech Advanced military communication platforms now integrate multiple electronic components to provide improved situational awareness, communications and even weapons support. A critical element to the successful operation of these systems is a circuit board shield that can eliminate unwanted electromagnetic and radio frequency interference, as well as stand-up to the punishment of harsh and high-vibration environments. Leader Tech’s standard CBS line is a shielding solution for many of these mission critical applications. The rugged two-piece fence and cover design allows easy access to board level components during assembly and rework and provides a cover retention up to 2.5 lb./linear inch once attached. Numerous fence height options are available to accommodate electronic components ranging from 0.13 inches to 0.80 inches. Each shield can also be specified for through hole or surface mount installation. The Leader Tech CBS product line delivers a shielding effectiveness to 60 dB and is available with many customization and finish plating options. With Class H testing, this restriction is loosened slightly to allow for no more than one failure per lot. This slight variation in the process eliminates scrapping entire lots of serviceable and tested parts because of a single failure and, consequently, increases yields and decreases price while still providing highly-reliable and rugged EMI filters. Souriau PA&E Class H EMI filters are inspected in accordance with MIL-PRF 28861 and must pass nearly 20 different tests that may include temperature rise, thermal shock, vibration, current overload, corrosion (salt spray), terminal strength and destructive physical analysis. Hermetically sealed Class H filters are tested to 1x10-7 HE at one atmospheric pressure. Spec Mini Solder-In Feed-Thru Filter Joins Spectrum Control Line of EMI Filters API Technologies Corp.’s new Spec Mini solder-in feed-thru filter is now available. This low pass filter is a new addition to the Spectrum Control line of EMI filters. The Spec Mini filter (9909 series) has a miniature case measuring 0.140 inches diameter (flange) by 0.120 inches diameter (barrel) with a body length of 0.110 inches and a total overall length of 0.400 inches including leads. “This new miniature solder-in filter is hermetically sealed on one end for thru-hole sealing between compartments. This allows it to be soldered into a package, bracket or bulkhead while maintaining hermeticity,” said Larry Howanitz, vice president, Spectrum Control Business Group of API Technologies. Conventional seal, reverse seal and hi-rel versions are also available. The RoHS compliant Spec Mini solder-in feed-thru filter is well suited for a variety of products intended for use in the microwave frequency spectrum including oscillators, attenuators and synthesizers. It features a rugged monolithic discoidal capacitor construction with capacitance values of 5 pF to 0.027µF. Its high temperature construction meets military requirements for solderability and resistance to soldering heat, and its high-purity gold plating provides added compatibility with gold bonding techniques. Teseq, Inc. now offers a digital EMC/EMI receiver module that extends the frequency range of the PMM 9010 receiver system from 6 GHz to 18 GHz, thus the upgraded PMM system can now be used for a wider range of EMC testing. The battery-powered PMM 9180 is a fully-compliant EMI receiver module that connects directly to an antenna located inside the testing chamber, and has the ability to transmit data outside the testing chamber via fiber optic cable, eliminating signal losses that can exceed 20 dB. The PMM 9180 is fully compliant with CISPR 16-1-1 and MIL-STD. It features a plug-in Li-Ion rechargeable battery that lasts for a minimum of four hours. The FCC requires that EMC emissions testing be performed at 10 times the highest clock frequency in a product. By using the PMM 9180, FCC testing can be performed on products with clock speeds to 1.8 GHz as well as MIL 461 RE 102 testing, which has an upper frequency limit of 18 GHz. The PMM 9180 can also be used for CE marking. The PMM 9180 is fully compatible with the PMM Emissions Suite software. This software offers full control of all auto and manual receiver functions, real-time display, editing of standard limits, creation of correction factors tables and warning messages for incorrect settings. In addition, the software includes one-click operation for selecting measuring mode: swept, spectrum analyzer or tuned. All measurements taken by the receiver can be retrieved, saved, recalled and compared when using PMM’s PC Emissions Suite software. The PMM 9180 features a high speed optical interface, an operating temperature of -5°C to 45°C, a measurement accuracy of +2.0 dB and a maximum input level of 137 dBuV without damage. New Module Triples EMC Testing Range to 18 GHz in Digital Receiver from Teseq Souriau PA&E Announces New Testing Standards For Space Qualified EMI Filters EMI engineers designing components for satellite and other space applications now have an alternative to expensive and timeconsuming Class S level testing, following the announcement of Souriau PA&E’s new Class H EMI filter testing requirements. This hybrid approach adds most of traditional Class S tests to Souriau PA&E’s standard Class B testing process. The primary difference between Class S and the new Class H testing is the number of component failures allowed per lot. Under strict Class S, a single component failure will cause an entire lot to be scrapped. 16 AVX Corp. has developed an advanced varistor designed for general ESD protection use in automotive circuits. The AEC Q200qualified Automotive StaticGuard series varistor delivers low capacitance and the low specified leakage current. The varistor series provides bi-directional transient voltage protection in the on-state and added EMI/RFI attenuation in the off-state, while offering an ESD rating up to 15 kV. Available in miniature 0402, 0603 and 0805 case sizes, the RoHS-compliant Automotive StaticGuard series devices are well suited for general-purpose drives, general-purpose logic, transceiver chips and sensor applications. New Automotive Varistor Delivers the Low Specified Leakage Current March/April 2012 www.ElectronicsProtectionMagazine.com http://www.ElectronicsProtectionMagazine.com

Table of Contents for the Digital Edition of Electronics Protection - March/April 2012

Electronics Protection - March/April 2012
Surge Stopper Shields Electronics From Transients Beyond 100 V
The Lowdown on IP Codes – Ingress Protection of Electrical Products
A Case for Safety - AC Arc Fault Circuit Interruption for PV Systems with Microinverters or AC Modules
Enclosure Design: IVC’s new Lightweight Explosion-Proof Camera Enclosure System
Portable Shock and Vibration Protection
Polycase Offers New Options for NEMA 4X Plastic Enclosures
New Circuit Board Shielding from Leader Tech
Laird Technologies Releases new Liquid Cooling Systems Product Line
ASI Releases New UL489 Hydraulic Magnetic Circuit Breakers
PEM C.A.P.S. Captive Panel Screws Offered in Three Mounting Styles26
SolarFocus Releases new SolarKindle Case
Indsutry News
Coherent Integrates Marway’s Power Distribution Solution into Energy Efficient, Direct-Diode Laser System Design

Electronics Protection - March/April 2012