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Full band attenuators are waveguide based attenuators of four types: fixed, level setting, direct reading and programmable. These attenuators are offered to cover the frequency range of 18 to 140 GHz. Direct reading and programmable attenuators are constructed with a precision, resistive rotary vane in a circular waveguide. The programmable attenuator is designed for both manual and computerized operations. While the toggle switch and LED indicator on the front panel are used for manual operations, an IEEE-488 or RS-232 interface on the back panel is used for automatic controls. The programmable attenuator is ideal in ATE systems where the attenuation is controlled remotely via a computer interface.