Making Precompliance Conducted and Radiated Emissions Measurements with PSA Series Spectrum Analyzers

Focus:

Many equipment manufacturers perform EMI tests during their product development cycles to increase the likelihood that their finished products will meet the necessary EMC requirements and pass any required tests. This approach avoids the need for costly redesigns and delays associated with failure to pass final EMC testing. These “precompliance measurements” performed during product development do not require the same level of accuracy as full compliance measurements. Consequently, equipment and test requirements are easier and less costly than those required for full compliance measurements. This application note describes in detail how to perform precompliance measurements of both conducted and radiated EMI using test setups based on Agilent’s PSA series spectrum analyzers. All of the required equipment is either specified by model number or clearly described. (Part numbers for antennas, probes, and cables can be found on the vendor’s website under EMC Test Accessories.) A section on “Precompliance Measurements Process” explains how to determine which emissions regulations apply to the product under test and provides some basic information on the common FCC, EN, and CISPR standards. The app note also provides tips on EMI problem solving, background information on EMC test components, a glossary of EMI test terminology, and a list of worldwide EMC regulatory agencies.

What you’ll learn:

• How to measure conducted and radiated EMI
• How to perform precompliance measurements of a product's conducted and radiated EMI
• How to determine what EMC regulations apply to a product under development

Notes:

Application Note Agilent AN 1328. Many power supply design articles discuss techniques for minimizing conducted and radiated emissions in a new design. However, few of those articles explain how to measure those emissions as this application note does.

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Author & Publication:

no author specified, Agilent Technologies, Vendor website, Aug 10 2004

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