Introduction Insertion loss, the term used to express a filter’s ability to reduce or attenuate unwanted signals, has traditionally been measured in a 50 ohm source and 50 ohm load impedance condition, as standardized in MIL-STD-220. In this matched 50 ohm impedance condition, various types of filter circuit configurations, single capacitor, “L’s”, “PI’s”, and “T’s”, will … [Read more...]
EMP/HEMP Filter Meets Mil-STD-188-125, E1 & E2 Pulse Test Requirements
API Technologies’ model 52-1700-XXX High-altitude Electromagnetic Pulse (HEMP) Filters are designed to protect sensitive electronics equipment during hazardous transient conditions. They are employed to absorb a potentially destructive overshoot voltage. Under normal operating conditions, the suppressor circuit exhibits high off state impedance that appears transparent to … [Read more...]
Input Filters – The Key to Successful EMC Validation
Co-authored by: Ranjith Bramanpalli & Steffen Schulze Würth Elektronik INTRODUCTION Input filters are today as ever a requisite factor for successful EMC validation of switching controllers, irrespective of the size of the AC component involved. Switching controllers create conducted EMC interferences due to AC components in their lines, independent of their individual … [Read more...]
EMI Troubleshooting – Step-By-Step
In this article, I’ll describe the steps I usually take to troubleshoot the top four EMI issues, conducted emissions, radiated emissions, radiated immunity, and electrostatic discharge. Of these, the last three are the most prevalent issues, with radiated emissions typically being the number one failure. If your product or system (EUT) has adequate power and I/O port filtering, … [Read more...]
New Series of Vector Network Analyzers Released
Legendary support and quality meet ease-of-use and affordability. The Tektronix TTR500 Series 2-port, 2-path vector network analyzer is our latest breakthrough – an unmatched combination of measurement performance and convenience at 40% lower price than leading benchtop alternatives! It’s used to measure filter and antenna response, as well as shielding effectiveness, as … [Read more...]
New Extended Temperature COTS Filters Operate at Elevated Temperature Environments
ITG Electronics, a leading manufacturer of Inductors and Transformers in business since 1963, now offers a range of EMI filters for Military, Industrial, Commercial, Telecom and Medical applications. The Single Stage F1800 and Dual stage F2800 series single phase COTS EMI filters operate over extended temperature range of -40°C to +85°C (-40°F to +185°F) for applications … [Read more...]
New EMI Filter for Commercial/Military Apps
ITG Electronics, Inc., a supplier of passive components for over 50 years, has announced the introduction of an extensive line of custom and specification specific EMI filters for both commercial as well as military applications. By combining the Filters with its already broad offering of high reliability/ high performance Inductors and Transformers that ITG currently … [Read more...]
Measuring Common Mode Versus Differential Mode Conducted Emissions
When faced with excessive conducted emissions from switching power supplies, one of the first things to investigate and to determine the adequacy of is the power line filter. Line-powered switching supplies generally have both common mode and differential mode sections of the filter as shown in the generalized schematic in Figure 1. When using a line impedance … [Read more...]
Update to EMI Filter Selection Simulator Available
Murata Manufacturing Co., Ltd. is offering an update to their EMI filter selection software. The software simulates effects of Murata EMI Filters and Chip Capacitors based on specified conditions. Function This can be done easily by using the mouse on your Windows interface. The results of simulation are shown in the charts of "Voltage-waveform" and … [Read more...]
Miniaturized LC Filters for EMI Suppression Available
TDK Corporation presents the MEM1005PP251T – a new LC filter for EMI suppression. With dimensions of just 1.0 mm x 0.5 mm x 0.35 mm the filters are ideally suited for use in smartphones and base stations. Volume production began in March 2017. The usual method for suppressing interference in the communication frequency bands of smart phones and other devices is to use … [Read more...]
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