Numerical models can provide data from an enormous number of points and for a number of human simulants. Alastair R. Ruddle, Ph.D. MIRA Limited, Nuneaton, UK On-board transmitters are already commonly encountered in the vehicle environment: typical examples include mobile telephones, Bluetooth systems, and communications equipment used by the emergency services and armed … [Read more...]
Ensuring Electromagnetic Compatibility (EMC)
The IEC coordinates a worldwide system for testing electrical equipment. International Electrotechnical Commission Geneva, Switzerland How does a hospital manager know that equipment such as a CAT scanner, when operating, will not affect nearby electromagnetic systems in the building, such as an X-ray machine, thereby potentially putting patients at risk? Since the early … [Read more...]
Test Beyond the Specs: Why Test Higher in Frequency and Field Strength?
IEC 61000-4-3: 2006's frequency escalation Jason Smith and Pat Malloy AR RF/Microwave Instrumentation, Souderton, PA, USA An increasing number of new and proposed EMC standards are pushing the upper frequency test limits higher into the microwave spectrum. The latest EMC standard released, IEC 61000-4-3: 2006, is no exception. The upper frequency test limit has been increased … [Read more...]
New EMC Directive: 2004/1081 EC
Manufacturers should familiarize themselves with the additional requirements and the alterations found in the new EMC directive Manjula Bhati Electronics Regional Test Laboratory (West), Indian Ministry of Information Technology, Mumbai, India The current EMC directive 89/336/EEC, which was first published in 1989 and then succeeded by four amendments has been rewritten as … [Read more...]
Voltage Sag Testing for Commercial and Industrial Equipment
The ultimate goal for any product manufacturer is to make its product immune to voltage sags. Andreas Eberhard, Power Standards Lab Alameda, CA Modern equipment can be sensitive to brief disturbances on the AC power mains. Unfortunately, electrical systems are subject to a wide variety of power quality problems that can result in interruption of the production process, damage … [Read more...]
An Emission Measurement System for the Twenty-First Century Based on Time-Domain Measuring Methods
More information and reduced measurement time can significantly improve the quality of emissions testing. Stephan Braun and Peter Russer Institute for High Frequency Engineering, Munich University of Technology, Munich, Germany For some time, measurements of electromagnetic interference have been carried out by super-heterodyne receivers operating in the frequency domain. … [Read more...]
CISPR Basic Standard on Measuring Radio Disturbance and Immunity (11/15/2007)
CISPR 16-1-1 Ed. 2.2 is a part of CISPR designated as a basic standard. It specifies the characteristics and performances equipment for the measurement of radio disturbance voltages, currents, and fields in the frequency range of 9 kHz to 18 GHz. Also, requirements are specified for specialized equipment for discontinuous disturbance measurements. The requirements include the … [Read more...]
CISPR Amendment Deals with Radio Disturbance and Immunity Measuring Apparatus
CISPR 16-1-4-am1 is an amended specification for radio disturbance and immunity measuring apparatus and methods. This amendment includes ancillary apparatus and radiated disturbances. For more information, or to purchase this amendment, go to the International Electrotechnical Commission's website.Wondering what the correct application of a standard involves? Let your peers … [Read more...]
Global Map of Magnetic Anomalies Compiled
An international team of researchers has assembled the first global map of magnetic peculiarities, or anomalies, dispersed around the globe. These magnetic anomalies are caused by differences in the magnetism of rocks within the crust of the Earth. This map is the result of many years of negotiations to gather confidential data from many governments and organizations. The … [Read more...]
Shielding Effectiveness of Gaskets, Composites and Shields
There is an ever-increasing demand for lighter, stronger, easy-to-manufacture and cost-effective shielding solutions. Jack Prawica and Jereme Irwin DLS Electronic Systems, Inc., Wheeling, IL, USA As we move into the 21st century, there is a demand for stronger, lighter, less expensive, and environmentally friendly, RoHS-compliant* conductive materials. Many industry insiders … [Read more...]
- « Previous Page
- 1
- …
- 138
- 139
- 140
- 141
- 142
- …
- 145
- Next Page »
