Some applications may require limiting the inrush spike into the input capacitors. Steve Butler and Jeremy Ferrell, VPT, Inc., Blacksburg, Virginia, USA BACKGROUND Inrush current is the spike of current drawn by a power supply when it is turned on. A typical power system is shown in Figure 1. The input EMI filter will include some capacitance connected across the input … [Read more...]
Enhanced Test System Targets Emissions Testing from 9 kHz to 30 MHz
A newly released version of GAUSS Instruments’ “TDEMI” test systems carries out emissions testing from 9 kHz to 30 MHz. The original version, released earlier this year, handled the frequency range of 150 kHz to 1 GHz. With the new “TDEMI30M” a quasi-peak measurement in Band A or Band B can take as little as 12 seconds. The “TDEMI” measurement system from GAUSS Instruments … [Read more...]
Emission Measurement System Features Real-Time Analysis
The “TDEMI” measurement system from GAUSS Instruments carries out emission measurements in the time domain, and features EMI receiver emulation using an FFT-based bank of filters. With real-time analysis, the signal is parallel-processed continuously over a wide frequency band and is then analyzed using the quasi-peak detector. A special mode enables real-time analysis in peak, … [Read more...]
Initial Safety and Efficacy Data on Allowing MRIs for Pacemaker Patients
Initial safety and efficacy data on Medtronics’ investigational implantable device—the ENRhythm MRI™—were presented August 31 at the European Society of Cardiology Conference. An ongoing study hopes to find a solution for patients with pacemakers who also require the diagnostic benefits of an MRI (magnetic resonance imaging) scan. Results presented showed no MRI-related … [Read more...]
Radio Operators Oppose Proposed Change to Disturbance Limits of CISPR 22
Recently there has been a flurry of activity opposing the proposed change to the disturbance limits of CISPR 22. Objections focus on proposed Power Line Telecommunications (PLT) disturbance limits, which would be relaxed by 18 dB. These disturbance limits for Power Line Telecommunications (PLT) systems are defined by the standard CISPR 22 and its European equivalent EN 55022 … [Read more...]
EM Simulation Software Firm Included on Inc.’s Prestigious 5000 List
State College, PA-based Remcom has announced that it has been included on the 5000 List of Inc., a well known business periodical. Specifically, Remcom was included as being one of the fastest growing private copanies in the U.S. Remcom has provided electromagnetic simulation software to design engineers and EM professionals for nearly fifteen years. According to Inc., the … [Read more...]
Op Amps Feature Integrated EMI Filters
The LMV83x Series of operational amplifiers from National Semiconductor has integrated EMI filters that maintain the accuracy of analog systems by reducing the effects of RF (radio frequency) interference. They are reported to have an EMI rejection ratio (EMIRR) of 120 dB. The LMV831 single, the LMV832 dual, and the LMV834 quad op amps feature CMOS inputs, a maximum inset … [Read more...]
New EMC Testing Facility Seeks to Boost Retailers’ Product Confidence
A new EMC testing facility has been launched by UK-based TÜV Product Service. This is a unique “spot check” testing facility for retailers, who can now determine if the electronic products they offer comply with existing standards and laws. Specifically, the testing will confirm whether household electrical items such as TVs, camcorders, and game consoles will interfere with … [Read more...]
TÜV Rheinland and TÜV SÜD Withdraw Current Merger Application
The management boards of TÜV Rheinland and TÜV SÜD have withdrawn their merger application from Germany’s Federal Cartel Office. Company officials have determined that the initial proposal would not have met current anti-trust requirements in Germany. Both companies plan to reapply for a merger with a new business solution that meets Germany’s strict anti-trust requirements. … [Read more...]
Detroit EMC2008 – Extensive interest shown in MILMEGA’s 1-6GHz amplifier solution
Visitors to the MILMEGA booth at the Detroit EMC 2008 exhibition hall showed extensive interest in the new hybrid 0.8-6.0GHz power amplifier on display there.Of particular interest was the modular, scalable architecture permitting a selection of power levels in the two bands (0.8-2.0GHz and 2.0-6.0GHz internally switched) and an easy, proven route for upgrades in power. The … [Read more...]
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