All ISO-MAX^® isolators with an “I” in the model number (CI-2RR and PI-2XX, for example) use transformers with internal Faraday shields.  Faraday shields, sometimes called “electrostatic” shields, improve rejection of high frequency buzz by a factor of 100 to 1,000 (40 dB to 60 dB) over transformers without them.

Posted in: Iso-Max