In most cases, information and parameters can be entered through the keypad, the directional arrows, or the rotary knob. The numerical keypad enters the information directly. The Up and Down arrow keys change a frequency parameter by the value entered through the Freq Step submenu key (default value is 1 MHz). The Left and Right arrow keys change the frequency parameter by one grid increment, that is, one‑tenth of the total span. The rotary knob changes the frequency parameter by one pixel per step. The screen has 551 pixels across its width. Choose whichever method is most convenient to enter the required information.