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Abstract

There has been a large increase in activity in the area of radiated emission testing for electromagnetic compatibly (EMC) of electrical equipment. Recently there has been a requirement that uncertainties of measurement are taken into account in the assessment of whether or not a piece of equipment passes the appropriate specification limit. Until recently the majority of EMC test house used antenna factors provided by the antenna manufacturers, often with uncertainties greater than +/-2 dB. This intercomparison described in this report is concerned with the accurate calibration of antenna factors. The facilities targeted were those that calibrate antennas, either for themselves or for others. The task was for each of the participating laboratories to measure the antenna factors and reflection coefficients of six antennas at a selection of frequencies in the frequency range 30 MHz to 1 GHz. Participants were to estimate the uncertainties of their measurements. Participants were encouraged to perform some optional measurements if they had the resources. These included the measurement of free-space antenna factor, the swept frequency calibration of broadband antennas and site attenuation measurements to assess the quality of the site. Discussions on how to improve the accuracy of the measurements and how the findings were to be applied to EMC emission testing were held.

Additional information

Authors: ALEXANDER M J, National Physics Laboratory, Teddington (GB)
Bibliographic Reference: EUR 16708 EN (1996) 71pp., FS, free of charge
Availability: Available from the European Commission, DG XII Measurements and Testing Programme, 200 rue de la Loi, B-1049 Bruxelles (BE)
ISBN: ISBN 92-827-6265-3
Record Number: 199610805 / Last updated on: 1996-08-30
Category: PUBLICATION
Original language: en
Available languages: en