 | Amplitude Top Sets the top amplitude value using the keypad, the Arrow keys, or the rotary knob. Press Enter to complete the entry. Bottom Sets the bottom amplitude value using the keypad, the Arrow keys, or the rotary knob. Press Enter to complete the entry. Autoscale Automatically sets the top and bottom scales to the minimum and maximum values of the measurement with some margin on the y‑axis of the display. Fullscale: Fullscale automatically sets the scale to the maximum allowable setting for each measurement. Scale Preset: Scale Preset automatically sets the scale to the default setting: 0 dB to 60 dB for Return Loss measurements, 0 dB to 30 dB for Cable Loss, 1 to 3 for VSWR measurements, and +10 dB to –90 dB for Transmission measurements. The following submenu key appears only for Smith Chart measurements, and is then the only submenu key in the Amplitude Menu: Ref. Impedance 50 Ω 75 Ω Sets the reference impedance that is used for Smith Chart calculations to either 50 Ω or 75 Ω. The reference impedance determines the value of impedance at the center of the Smith Chart. |