title: An interlaboratory comparison program on ELF electric and magnetic fields measurements performed in Greece: Second round of the scheme.
abstract: The second round of an interlaboratory comparison program for extremely low frequency electric and magnetic fields measurements was performed at the High Voltage Laboratory of the National Technical University of Athens (Greece). The 16 participating laboratories measured the following: (i) electric field produced by a scale transmission line; (ii) magnetic field produced by a medium voltage cable; and (iii) magnetic field and frequency at the center of a standard square coil and their delivered results were evaluated in all measurement scenarios with use of performance statistics z-scores. Deviations between z-scores based on usual estimators (mean value, standard deviation) and robust estimators (derived with the robust algorithm described by the International Organization for Standardization [ISO, 2005]) highlight improved performance of the robust algorithm. An overall comparison to measurement procedure and performance results of the first round proves effectiveness and necessity of the scheme. Improper instrumentation or calibration, instability of the field source and measurement position uncertainty are factors that may cause unsatisfactory performance of the participants.
authors.affiliation: High Voltage Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
authors.forename: Ioannis
authors.initials: I
authors.lastname: Ztoupis
authors.affiliation: High Voltage Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
authors.forename: Eleni
authors.initials: E
authors.lastname: Nicolopoulou
authors.affiliation: High Voltage Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
authors.forename: Ioannis
authors.initials: I
authors.lastname: Gonos
authors.affiliation: High Voltage Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
authors.forename: Ioannis
authors.initials: I
authors.lastname: Stathopulos
authors.affiliation: Greek Atomic Energy Commission, Non-Ionizing Radiation Office, Athens, Greece.
authors.forename: Efthymios
authors.initials: E
authors.lastname: Karabetsos
mesh_terms: D000465:Algorithms; D002138:Calibration; D055615:Electrical Equipment and Supplies; D004574:Electromagnetic Fields; D004581:Electronics; D004867:Equipment Design; D006115:Greece; D007753:Laboratories
keywords: ELF EMF measurements; error sources; exposure; human health; z-scores