Abstract
Abstract. In this paper we discuss the results of an intercomparison for electric field strength measurements within the German Calibration Service (Deutscher Kalibrierdienst – DKD). The comparison has been carried out on the field strength value required to reach a display reading of 20 V m−1 of the field probes for frequencies between 100 MHz and 18 GHz. Five laboratories joined the intercomparison including the Physikalisch-Technische Bundesanstalt (PTB), the German National Metrology Institute that keeps the primary standard for electric field strength. As measurement artefacts both a small 1-axis probe usually used as transfer sensor at PTB and a larger 3-axis commercial field probe have been used. While the results agree well for the small field probe and when the larger commercial 3-axis field probe is oriented in the direction of the magnetic field, larger deviations occur, when the larger 3-axis field probe is oriented into the direction of the Poynting vector of the calibration field.
Highlights
Field probes are widely used to determine the electric field strength, e.g. for guaranteeing personal safety in electromagnetic fields or for setting the test levels during electromagnetic compatibility interference testing
While the results agree well for the small field probe and when the larger commercial 3-axis field probe is oriented in the direction of the magnetic field, larger deviations occur, when the larger 3-axis field probe is oriented into the direction of the Poynting vector of the calibration field
To assess the technical competence of the accredited laboratories, an intercomparison was organised by the Physikalisch-Technische Bundesanstalt (PTB), the German National Metrology Institute, within the framework of the German Calibration Service (Deutscher Kalibrierdienst – DKD), which is the association of the accredited laboratories in Germany (PTB-Mitteilungen, 2015)
Summary
Field probes are widely used to determine the electric field strength, e.g. for guaranteeing personal safety in electromagnetic fields or for setting the test levels during electromagnetic compatibility interference testing. Both fields of application require accurate knowledge of the calibration factor of the field probe to be able to measure field strengths traceable to the SI units with known measurement uncertainty. In addition to PTB, three accredited and one nonaccredited laboratories took part in the intercomparison As measurement artefacts both a small 1-axis probe developed by PTB and a commercially available field probe ETSLindgren HI-6053TM were used in different orientations. Pape et al.: Results of an intercomparison for electric field strength measurements
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