RF POWER Rotary Step Variable attenuators can be installed in experimental circuit or inside device to adjust power level of the microwave circuit without interrupting the circuit. Rotary step attenuator is the ideal instrument for use in waveguide systems where broadband direct reading of attenuation is required, particularly as a standard for reflectometer and swept systems. Rotary stepped attenuator can also be used as an internal attenuator for instruments and equipment, featuring small size, high precision, stability and reliability.