Electromagnetic attenuation features can be incorporated as an integral part of touch screens rather than as a separate component in those display applications requiring shielding for EMI/EMC compliance. Various enhancement techniques and design considerations will be reviewed. Features and methods employed will vary with particular touch screen enhancements and will include … [Read more...]
PCB Board Level Enclosures: A Vital Design Element
PCB design is vital to the efficacy of innumerable electronic products. A reliable product and marketplace success are the ultimate rewards for careful consideration of all design issues. Choosing an appropriate board level enclosure is just one element of successful design efforts, and the choice must be carefully considered along with other crucial issues including the … [Read more...]
Understanding Shielding Effectiveness of Materials and Measurements in the Near-Field and Far-Field
When we treat the shielding effectiveness measurement with a uniform field, the results are similar for both near and far fields. Kermit O. Phipps and Philip F. Keebler EPRI EMC Laboratory, Knoxville, TN, USA INTRODUCTION Traditionally Schelkunoff’s shielding effectiveness equation is used universally in teaching and practice throughout the EMC community as a whole. In this … [Read more...]
Snap-In Flange Mount Filters Target High Current Applications
The PBH filter series from Power Dynamics, Inc. (PDI) targets applications with high current (16/20 A) requirements. These filters are available with varying configurations of components and termination styles. They are available in flange mount or snap-in types. The medical filters offer a maximum leakage current of 2 µA at 120 VAC at 120 VAC, 60 Hz. A ground choke can be … [Read more...]
New EMI Filters Comply with DOD’s COTS Directive
The new VPT10-28 (10 A) and the VPT2028 (20 A) have been added to its COTS product line by VPT, Inc. These filter modules provide compliance to MIL-STD-461 C/D/E for conducted emissions in military and avionics DC power systems. Both devices fulfill the DOD’s COTS (commercial-off-the-shelf) directive in terms of cost and stringent military and avionics performance standards. … [Read more...]
Press-In EMI Filters Minimize Installation Time
The GS136 line from Cory Micronics has been crafted to minimize installation time while delivering the same filtering as the firm’s line of bolt-in filters. These new filters are well suited to use in products where soldering is not required or in applications where traditional installation is too time-consuming. The knurled filter housing is designed to be pressed directly … [Read more...]
DIN-Rail Mounted Filters Protect Against Surges and Voltage Transients
The new STFE Elite Series of Active Tracking® filters from SolaHD mount directly on standard DIN rails. They have been crafted to provide superior protection from the full spectrum of voltage transients and surges that may impair operation of control panels, factory automation systems, PLCs, and other industrial and machine tool equipment. These filters combine a hybrid … [Read more...]
Power Filter Line Expands with Addition of RAST 5 Option
The WG Power Filter Line family from Tyco Electronics has been expanded a new power line filter with a RAST style connector for ease of installation and the elimination of potential wiring errors. This tubular filter is now available with an un-keyed two-position RAST 5 header that mates with Tyco Electronics’ stand connectors or with the RAST 5 Positive Lock Mark III … [Read more...]
Extensive Line of Custom EMI Filters Available
WEMS EMI/RFI Filter Division designs and manufactures high reliability input, output, power line, and signal filters intended for military, aerospace, and high end industrial applications. WEMS services include filter circuit design and analysis, filter packaging and layout, prototype/first article, EMI test assistance, environmental tests, source control drawings, acceptance … [Read more...]
High Attenuation EMI/RFI Filters Meet the Requirements of MIL-F-15733
New dual and triple circuit power line electronic filters from Fil-Coil meet the requirements of MIL-F-15733. These dual and triple units run at operating temperatures or -550 degree C to +850 degrees C. Voltage ratings are 115 VAC, 400 VDC, 0 – 400 Hz. With minimum insertion loss characteristics, these MIL-F-15733/75 filters eliminate noise and interference to achieve … [Read more...]
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