I recently published this blog, detailing a simple proven method for estimating the radiated E field with specified test setup. As a result, I received the following feedback... 'This model is wrong for equipment tested over a ground plane as described. The complex correct transmission line model (less the ground plane) is given by Balanis, and a simpler but accurate … [Read more...]
A Simple Method for Estimating Radiated Emissions
A simple method for estimating radiated emissions I recently received the following question: How to calculate the radiated E field with following test conditions with an antenna placed 1 meter away from the test setup?: A commercial equipment under test with metal housing Equipment placed on the grounded metallic table/plane LISN installed (and also placed … [Read more...]
Comparison of PWM VFDs versus Resonant Link Converters – Part 2
In Part 2 of this blog, the harmonic current distortion of a typical Variable Frequency Drive (VFD) is discussed, as well the possible solutions to the problems that this causes. Active Front End or (AFE) units are also discussed and some of the issues that they themselves … [Read more...]
Comparison of PWM VFDs versus Resonant Link Converters – Part 1
AC variable frequency drives (VFDs) have been in existence in a number of forms since the early 1970s. In the early 1980s the “pulse width modulated” (PMW) VFD versions began to appear. This form of motor control produced less motor rotor and stator harmonic heating and delivered smoother torque control at slow motor speeds. Thirty years on PWM VFDs are still the most … [Read more...]
Insertion Loss and Filter Performance
Background Filters are almost always a part of electronics design. Design engineers design a filter to achieve certain attenuation in specified frequency range. There are many types of filters, such as high pass, low pass or bandwidth. Popular filter configurations include L-C, C-L-C (π) or L-C- L (T). It is safe to say that when it comes to filter design, the discussion of … [Read more...]
ITG Electronics Introduces Multi-line Low-voltage Dataline Filters for MRI & Shielded Rooms
Enhanced single-line and new triple- and quadruple-line filters expand clean data transmission options, reduce wall penetrations, and improve mounting security and terminal block connectivity. Elmsford, NY – ITG Electronics, a leading manufacturer of inductors, transformers and EMI Filters since 1963, has enhanced and expanded its series of dataline filters for MRI rooms and … [Read more...]
Design Characteristics and Verification of Chambers for Testing to CISPR 25
This article is intended to provide an understanding of the requirements for qualification of an Absorber Lined Shielded Enclosure (ALSE) for use in the measurement of radiated disturbances in the frequency range of 150 kHz to 2,500 MHz, as described in CISPR 25. Who is CISPR In order to provide the technical parameters for verification of these compliance test sites, it … [Read more...]
Heilind Electronics Partners with Quell Corporation, Expanding EMI/RFI Filtering Portfolio
Heilind Electronics, a premier global distributor of electronic components, has expanded its connector portfolio with the addition of Quell Corporation – a subsidiary of HEICO and a leading manufacturer of EMI/RFI and transient protection solutions. The distribution agreement includes both Heilind Electronics and Interstate Connecting Components (ICC), the mil-aero division of … [Read more...]
Interstate Connecting Components (ICC) Introduces BHA PTFE-Plated M28876 Connectors from Amphenol Fiber Systems
Interstate Connecting Components, a division of Heilind Mil-Aero and leading distributor of military-aerospace connectors and accessories, is now offering M28876 circular fiber optic connectors with black hard anodized (BHA) PTFE (polytetrafluoroethylene) plating. The connectors are precision-engineered by Amphenol Fiber Systems International, a leading manufacturer of fiber … [Read more...]
TMD USA wins major defense contract for traveling wave tube amplifiers in a mission-critical surveillance role
Now part of Communications & Power Industries (CPI)) has won a large defense contract for traveling wave tube amplifiers (TWTAs) for use in a radar unmanned aerial vehicle program. Valued in excess of $2.5 million, the contract was awarded by a prime contractor under the terms of a competitive bid. Said Tom Curtin, vice president, sales and business development, TMD … [Read more...]
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