1. Press the Amplitude main menu key to display the Amplitude menu (Figure: Amplitude Menu).
2. Set the reference level automatically or manually.
a. Auto: Press the Auto Reference Level submenu key to allow the instrument to set an optimum reference level.
b. Manual: Press the Reference Level submenu key to open the Reference Level Editor dialog box and set the reference level. The range and increments of change are displayed in the dialog box.
3. Press the Pre Amp submenu key to toggle this function On and Off. The current state is underlined on the submenu key.
4. Press the Impedance submenu key to toggle through to the desired impedance parameter: 50 ohm, 75 ohm, or Other. If you select Other, then the Impedance Loss submenu key is displayed.
5. Press the Impedance Loss sub menu key to open the Impedance Loss Editor dialog box and select a dB loss level within the displayed range.
