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Content archived on 2024-04-16

Intercomparison measurements with electromagnetic field strength meters


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.

In progress.


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Aeritalia Società Aerospaziale Italiana SpA
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Corso Marche 41
10146 Torino

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Participants (10)