Emissions and Immunity Metrology

Project Goals

Reverberation chamber evaluation for vehicle EMC testing

Develop and evaluate reliable measurement standards, test methods, and services to support the electromagnetic compatibility (EMC) needs of U.S. industry. These needs are related to electromagnetic emissions (intentional or unintentional signals transmitted by the test device) and immunity (ability to resist external electromagnetic energy) of electronic devices, components and systems.The characterization of support hardware such as cables, connectors, enclosures, and absorbing or shielding material is an integral part of these measurements. Major challenges are to provide reliable and cost-effective test methods over a large frequency range (10 kHz to 40 GHz and, eventually, higher) and for large test volumes. The efficiencies and uncertainties of EMC measurements directly impact the competitiveness of U.S. manufacturers and the reliability of their products. NIST research quantifies and, in some cases, reduces these measurement uncertainties. NIST expertise, focused on generating and measuring electromagnetic fields, serves as a fundamental resource for industry and government.The main objectives are to ensure harmony and international recognition of US measurements for trade, to provide physically correct test methods, to provide national calibration services, and to serve as an impartial expert body for resolving measurement inconsistencies.

Background

U.S. industry must evaluate and control electromagnetic interference (EMI) that can impact economics and competitiveness (through trade restrictions and regulations), national security, health, and safety. U.S. industry pays 1 % to 10 % of total product cost and often suffers delays to market while trying to meet various EMC regulations and requirements. Industrial clients for NIST research, development, and measurement procedures are manufacturers of electronic equipment (or any system which employs electronic equipment), and EMI/EMC test and product certification laboratories. ÊSuccessful completion of this research should result in the development of measurement standards and techniques for EMI and EMC that are meaningful, technically practical, and cost-effective. A reduction in measurement uncertainties will lead to lower product development costs and facilitate acceptance of U.S. measurements by international regulating authorities. NIST, working with industry representatives, can help incorporate these techniques into the standards of both U.S. and international standards organizations. Coordinated international standards based on sound metrology are vital for U.S. industry to participate fully in the global markets for electronic instrumentation and goods.

Tasks

Develop a low–cost, ultra wideband measurement system for the performance evaluation of EMC measurement facilities
Develop a cone and ground plane sensor and antenna calibration facility that covers the 30 MHz to 18 GHz frequency range
Develop a rapid OATS evaluation measurement system that covers the frequency range from 30 MHz to 6 GHz