While nonlinear tests require users to set output level to fairly high levels, it is also imperative that the levels still stay within the max operating level limits of devices to avoid permanent damage. Rubidium offers a very useful feature called “RF Level Limit” which limits the output power to a level settable by the user. Once this level is set, the output of Rubidium will not exceed this level even if the user inadvertently tries to increase it from Level menu. With RF Level limit set, the user can be assured that Rubidium’s output level will not result in inadvertent damage to the devices.