2 User Interface
2.12 Undo/Redo
2.12 Undo/Redo
The Undo button in the "Control Bar" on page 135,
and the Undo front panel key,
are used to undo the most recently executed function.
If you Undo a function, and then decide you should not have done so, you can use
the Redo button in the "Control Bar" on page 135 to put it back the way it was. The
Redo function may also be executed by pressing Ctrl+Undo (holding the Ctrl key
down while pressing the Undo font panel key).
Undo allows you to restore a setting, which you had previously set, back to its value
before you changed it. When you press the Undo button or front panel key, the last
setting you changed is “undone”, that is, its previous setting is restored. You are
notified of this fact with an advisory pop up message; for example, if the Center
Frequency had been 300 MHz, and you changed it to 1 GHz and then pressed Undo,
the message would show:
UNDO: Center Freq 1 GHz -> 300 MHz
The instrument can store 5 levels of action for Undo.
To truly understand Undo and Redo, it helps to think of two “stacks”, an Undo stack
and a Redo stack,
UNDO stack REDO stack
Whenever you perform an action, it is placed on the Undo stack. So for example, if
you set the Center Frequency to 1 GHz, then set the RBW to 1 MHz, then set the
Detector to Peak, each of these actions gets “pushed” onto the Undo stack:
Short Range Comms & IoT Mode User's &Programmer's Reference 137
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