The 4310A/K Multiband Sweeper is for measurement and testing applications requiring an electronically multiplexed RF output with continuous sweeping over the 0.01 to 18 GHz frequency range. This system is also available with narrower frequency ranges. The 4310A/K offers many features such as: leveling and multiplexing in a single PIN device to achieve greater RF output power, automatic compensation of the sweep delay of YIG tuned RF sources, automatic control of tuning supply bandwidth for minimum incidental FM, and single know control of the RF power with automatic adjustment of the leveling loop gain. System consisting of control unit, plug-in holder and plug-ins 10 MHz - 2 GHz, 2 - 4 GHz, 4 - 8 GHz and 8 - 12,4 GHz.