N9935AU/330 FieldFox’s Pulse Measurement Option 330 can be used to characterize RF pulses such as those used in radar and electronic warfare systems. Measurements are made using FieldFox and Keysight’s UBS peak power sensors (not included). Performance specifications such as frequency, dynamic range and minimum pulse width depend on the peak power sensor. When purchasing a sensor, note option 330 only supports average AND peak sensors. It does not support average only sensors.