To obtain accurate results, compensate for any external attenuation by using power offset. In power offset mode, the compensation factor is in dB. (External attenuation can be created by using an external cable or an external high power attenuator.)

Press the RL Offset submenu key and use the keypad, the arrow keys, or the rotary knob to enter the desired offset value. When using the rotary knob, the value changes in increments of 0.1 dB. Using the Left/Right arrow keys changes the value in 10% increments of the value shown on the Scale submenu key. When using the Up/Down arrow keys, the value changes in the increment shown on the Scale submenu key. When using the keypad, enter the new value then press Enter or the dB submenu key to set the value. The power offset is displayed in the instrument settings summary column on the left side of the measurement display.