mõõtevahend, mille mõõteprintsiip põhineb liikuva pooli ja ühe või mitme ferromagnetilisest materjalist südamikuga pooli voolude vastastikusel mõjul, measuring instrument which operates by the interaction of a current in one or more movable coils with a current in one or more fixed coils and which incorporates magnetically soft material in the magnetic circuit, electrodynamic instrument in which the electrodynamic effect is modified by the presence of soft magnetic material in the magnetic circuit