The Amplifier Research FP4080 is a battery-operated broadband Isotropic Electric Field Probe designed for use in Radio Frequency Interference / Electromagnetic Compatibility (RFI / EMC) test system applications. This probe uses optical isolation to minimize field perturbation during measurements. The Amplifier Research FP4080 probe assembly consists of a spherical casing, containing the sensor, which is mounted on one end of a shaft; the other end of the shaft is attached to an extrusion which houses the electronics. The sensor and electronics housing operate - and are calibrated - as a unit. The Amplifier Research FP4080 measures the field strength in each of three axes. It performs a vector addition calculation on the readings and sends the resultant to the receiver (PC) via a fiber optic cable. Frequency response of the Amplifier Research FP4080 is 80 MHz to 40 GHz, dynamic range is 1 to 300 Volts per meter (V/m).