FIELD: electricity.
SUBSTANCE: specificity of the claimed device consists in introduction of additional second magnet core with test coil wound on it, at that turns of positive and negative wire for connection of the first magnet core pass through the aperture of the second magnet core, at that at the first magnet core restoring coil is wound additionally and the test coil at the second magnet core is connected by its one output to non-inverting input of the amplifier and by its second output to zero lead of the power supply source, in parallel to the testing coil at the second magnet core there is the fourth resistor introduced additionally, the amplifier output is connected to input of the introduced power amplifier, which output is coupled to one of outputs of the restoring coil placed at the first magnet core and which second output is coupled via the introduced fifth resistor to zero lead of the power supply source, common connection point of the fifth resistor and restoring coil is connected to inverting input of the amplifier.
EFFECT: improved measurement of differential current.
4 cl, 2 dwg
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