The disturbance antenna DA1 can be used to pick up noise signals caused by local corona discharge, or AM radio waves for instance. Its magnetic holder allows a flexible placement on a transformer tank or to other metallic parts close to the object under test. The output signal can be used to trigger the gate input circuit of all PD acquisition or monitoring devices.
The wideband antenna DA2 consists of a UHF antenna and a frequency converter unit. It is designed to filter high frequency signals e. g. emitted by cellular and GSM transmitting antennas. Therefore, it is especially used for GIS monitoring.