The EMF-25ESD and the EMF-35ESD are dual-function devices that provide both EMI filtering and surge protection thus conserving valuable PCB real estate. A zinc oxide varistor is used to enhance the devices’ EDS function. The EMF-25ESD has a cut-off frequency of 300 MHz, capacitance values of 25 pF, attenuation of 30 dB minimum at 0.8 ~ 1.0 GHz and 20 dB minimum at 1.0 ~ 2.5 … [Read more...]
EMI Filters Are Available with Optional Surge Suppression
EMI filters modules from Foster Transformer are available with optional surge suppression. These devices can be mounted with ¼-inch quick connect terminals, a feature that allows them to be used wherever needed for EMI suppression—even in multiple locations within one piece of equipment. The fully encapsulated construction of these device complies with EN 133200 and UL 1283, … [Read more...]
Filter Series Is Optimized for DC Applications
The FMEB and the FMEC line of filters from Schurter, Inc. have been optimized especially for use in DC applications, especially those requiring increased attenuation of asymmetric disturbances. These devices have a current rating of 30 amps at 80 VDC and are offered in single and dual polarity output circuits. The single polarity FMEB has been crafted for a maximum operating … [Read more...]
EPCOS Helps Boost Power Quality at Olympic Venues
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...]
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