Insulation Monitor ISOMETER® isoHV1685D
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The specially developed measurement method monitors the insulation resistance in installations where extremely high system leakage capacitances against earth exist due to interference suppression methods. Adaptation to system-related high leakage capacitances also occurs automatically.
More at: https://www.bender.de/en/products/insulation-monitoring/isometer-iso1685dp-isohv1685d-isolr1685dp/