 | SPA mode selected Impedance 50 Ohm 75 Ohm Other Press this submenu key to toggle the impedance setting to 50 ohm, 75 ohm, or Other impedance value. Selecting 75 ohm selects the 7.5 dB loss of the Anritsu 12N50‑75B adapter. For other adapters, select Other and enter the appropriate loss value. Auto Ref Level Press this submenu key to adjust the position of a displayed signal so that it is approximately two divisions down from the top of the sweep window, if possible. When the key is pressed, the reference level is adjusted once. Auto Ref Level may turn off the low-noise front-end preamplifier, but does not turn it on. It has no effect on vertical scaling. Back Press this key to return to the System Menu. |