Switching from football to sailing and wrestling, EPCOS, a well-known name in EMI/EMC, has announced that it supplied the harmonic filters for improving power quality for both the Qingdao Olympic Sailing Center and the Wrestling Center in Beijing. In Qingdao five tuned harmonic filter systems totaling 1400 kvar have been installed. In Beijing four systems for a total of 1200 … [Read more...]
Three-Layer Filters Provides Dust Filtering and EMI Shielding
The ATI 3-layer filters from Alco Technologies is a superior dust filtration, EMI shielding filter for minimum air flow requirements. Aluminum extruded profiles surround three layers of aluminum screen and are welded in place. Three layers of wave-formed aluminum wire screen, each with a decreased depth are layered together in an arrangement resembling the look of a continuous … [Read more...]
Crucial RF Shielding Selection Considerations
Gary Fenical Laird Technologies INTRODUCTION Designers must attenuate RF signals for various reasons. Since a product cannot be legally marketed unless it meets EMC requirements, designers must curtail RF signals above a certain limit. It is important to consider RF shielding materials at the beginning of a design project because choosing the correct kind of shielding upfront … [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...]
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