The Bird 8325 500 Watt Oil-Cooled Attenuator is a valuable and reliable accessory for reducing power levels and VSWR, for isolating components under test, for harmonic signal analysis, and as comparison standards. Bird's RF attenuators are world renowned for their high-quality, robust construction and conservative power ratings.
The Bird Model 8325 includes an expansion tank and a vent plug located on the output end at the top. When power is applied to the attenuator, the coolant expands into the expansion tank, as the air in the expansion tank is compressed it is allowed to escape through the vent plug.