Ruggedized Flat Panel Computer Is MIL-STD-461D CompliantThe NAG 20-inch MIL-SPEC flat panel computer from NAG Marine is a fully sealed NEMA 4X unit crafted specifically for harsh marine and/or engine room environments. The unit is built with low power consumption electronics for maximum heat efficiency and shock isolated components for elimination of the effects of shipboard … [Read more...]
QPL Inductor Series Meets Requirements per MIL-PRF-83446
The MLRF3031 series from Gowanda Electronics is a military-approved RF inductor that is on the military’s Qualified Product List per MIL-PRF-83446. These devices have been designed for RF electronic applications in the military, aerospace, and defense sectors. Possible communications applications include space, satellite, radio, sonar, guidance, and GPS systems. Technical … [Read more...]
Resistor-Capacitor Device Provides ESD Protection for 3G LCD Screens
The EClamp237xK family of resistor-capacitor (R-C) protection devices from Semtech Corporation safeguards lines for cellular frequencies between 1.8 GHz and 2.5 GHz, the data rates required by the latest generation of high-resolution LCD screens used for visually oriented 3G handsets. This series includes the four-line EClamp2374K, the six-line EClamp2376K and the eight-line … [Read more...]
Military COTS Filter Provides EMI Filtering & Transient Protection
The M-FIAM7 from Vicor is a DC front-end module that provides EMI filtering and transient protection. The M-FIAM7 allows designers using Vicor’s 28-V DC/DC V•I Chip modules to meet conducted emission/conducted susceptibility per MIL-STD-461E; and input transients per MIL-STD-1275A/B/D, MIL-STD-704A-F, and DO-160E. The M-FIAM7 accepts an input voltage of 14 to 50 VDC and … [Read more...]
Different Methods of Connecting an SPD to an Electrical Distribution Network
The way in which SPDs are connected can have a large impact on the overall protection provided Bryan Cole Introduction Surge protective devices (spds) or transient voltage surge suppressors (TVSS) are used to reduce the impact of overvoltage transients on the electrical distribution networks found in various industries. Of course, the efficacy of these devices will affect the … [Read more...]
Reducing Ground Noise Emissions in Critical Electronic Equipment and Facility Ground Systems to Help Prevent Conducted EMI Problems
Many EMI problems involve emissions that circulate through electrical conductors within a facility and within equipment Philip F. Keebler and Kermit O. Phipps EPRI Knoxville, Tennessee Background The electromagnetic environment includes the areas inside and outside electrical and electronic equipment. The areas inside equipment include unused air spaces, circuit boards, cables … [Read more...]
Rise Time vs. Bandwidth and Applications
A simple, practical mathematical model allows one to relate signal rise-time to the available bandwidth of a measurement instrument. Mekonen Buzuayene, Anritsu Corporation, Morgan Hills, Calif., USA In measurement instruments such as oscilloscopes and spectrum analyzers, the maximum rise time (tr) that can be measured with reasonable amplitude accuracy is directly related … [Read more...]
Silicone Filter Seals Adapt to a Wide Variety of Applications
EESeals™ from Quell, Inc. provide EMI and transient protection in a wide variety of applications. Formed from a unique silicone rubber and slightly oversized, they adapt themselves to the space where they are installed. This conformal quality maintains electrical contact for any devices within the shield. Specifically, MOVs, resistors, and other components can be added to the … [Read more...]
Capacitor Termination Can Enhance Reliability
Using a polymer termination for multilayer capacitors forestalls damage during PCB assembly Matthew Ellis For safety critical applications such as aerospace and military, failure caused by a short circuited capacitor could be disastrous. One of the most reliable components for surface mount communications is the multilayer ceramic capacitor, in which a block of ceramic … [Read more...]
Software Simulation Boosts the Efficacy of PCB Design
Adding an effective package to the design cycle can pinpoint areas critical to EMC compliance Dirk Müller, FlowCAD, Munich, GERMANY Ultimately, electromagnetic compatibility can be validated only in the measurement chamber with existing prototypes. Those tests are time consuming and expensive. There are various ideas for cutting the costs of testing with early software … [Read more...]
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