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Intercomparison measurements with electromagnetic field strength meters

Objective


Measurements for the BCR Intercomparison of Electric field meters were performed during 1991-1993 over the frequency range 100 kHz to 1000 MHz and field strength range 1 V/m to 10 V/m. Seven institutes participated in this intercomparison using at least three different calibration methods. Four field sensors, both electric and magnetic, have been used.

The comparison shows that for these sensors, a calibration with an uncertainty of less than 1 dB can be obtained, if certain procedures are followed. The results are applicable in the fields of EMC testing and health care (non-ionising radiation).
Many existing international electromagnetic (EM) compatibility regulations that refer to a variety of different fields, ranging from legal metrology to environment and safety, impose requirements on susceptibility and electromagnetic field strength in the rf range. The reliability of the associated measurements is at present not satisfactory since the EM field sensors are not all based on the same physical principle. As a consequence, in response to the same field, the reading of two meters may differ, even when they are correctly used. Calibration laboratories have set-ups where the EM field can be calculated and when confirmed by measurement.
However, at different test stations, instrument calibration is performed using non homogeneous techniques, in a variety of conditions and procedures. The present intercomparison is a first step towards the harmonisation of testing procedures. Three probes will be circulated:
- a magnetic probe (RMCO 6507)
- an electric isotropic probe (EMCO 7130)
- an isotropic probe manufactured by Aeritalia.
The measurement will be performed at linear polarization field levels of 1, 3, and 10 V/m, and .5, 1, 3, 10, 27, 100, 300, 500, 1000 MHz.

Status:
In progress.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Aeritalia Società Aerospaziale Italiana SpA
Address
Corso Marche 41
10146 Torino
Italy

Participants (10)

Area Brown Boves
Switzerland
British Aerospace plc
United Kingdom
Elektronikcentralen
Denmark
Laboratoire Central des Industries Electriques
France
Address
33 Avenue Du Général Leclerc
92260 Fontenay-aux-roses
National Physical Laboratory (NPL)
United Kingdom
Address
Queen's Road
TW11 0LW Teddington
PHYSIKALISCH-TECHNISCHE BUNDESANSTALT
Germany
Address
Bundesallee 100
Braunschweig
Philips
Netherlands
Radio Frequency Technologies Ltd
Ireland
Technical Research Centre
Finland
Van Swinden Laboratorium
Netherlands