30 Chapter 2
E4438C Vector Signal Generator Overview
Front Panel Overview
18. Incr Set Key
This hardkey enables you to set the increment value of the current active function. When this hardkey is
pressed, the increment value of the current active function appears as the active entry for the display. Use the
numeric keypad, arrow hardkeys, or the knob to adjust the increment value. Changing the Incr Set hardkey’s
value also affects how much each turn of the knob changes an active function’s value according to the
knob’s current ratio setting. For more information on softkeys, refer to the E4428C/38C ESG Signal
Generators Key and Data Field Reference.
19. Arrow Keys
The up and down arrow hardkeys are used to increase or decrease a numeric value, step through displayed
lists, or select items in a row of a displayed list. Individual digits or characters may be highlighted using the
left and right arrow hardkeys. Once an individual digit or character is highlighted, its value can be changed
using the up and down arrow hardkeys.
20. Hold Key
This hardkey blanks the softkey label area, the active function area, and the text areas of the display.
Softkeys, arrow hardkeys, the knob, the numeric keypad, and the
Incr Set hardkey have no effect once this
hardkey is pressed. Press any other hardkey to end the hold mode.
21. Return Key
This hardkey enables you to retrace your key presses. When in a menu with more than one level (More 1 of
3, More 2 of 3, etc.), the
Return key will always return you to the first level of the menu.
22. Display Contrast Increase Key
This hardkey, when pressed or held, causes the display background to darken.
23. Display Contrast Decrease Key
This hardkey, when pressed or held, causes the display background to lighten.
24. Local Key
This hardkey is used to deactivate remote operation and return the signal generator to front panel control.
25. Preset Key
This hardkey is used to set the signal generator to a known state (factory or user-defined).
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