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2 User Interface

2.12 Undo/Redo

For example, in the example above, if you now were to change another setting, such

as VBW = 1 kHz, the Redo stack gets cleared, and the stacks would look like this:

UNDO stack REDO stack

VBW = 1 kHz

RBW = 1MHz

CF = 1 GHz

Undo can undo changes you make with the knob or step keys, however all

contiguous events that affect the same parameter are aggregated into one event for

the sake of Undo. For example, if CF is the active function and is 1 GHz, and you turn

the knob back and forth, then enter a value, then use the step keys, when you press

Undo, the instrument returns to CF = 1 GHz.

Actions that Cannot be Undone

There are some actions that cannot be undone, because these clear the Undo/Redo

stack:

–

Restore Mode Defaults clears the stack for that Mode in that Screen

–

Sending SCPI commands clears the stack for that Mode in that Screen

–

Loading a state file (including User Preset) clears the stack for that Mode in that

Screen

–

Deleting a Screen clears all the stacks in that screen

–

Changing Views

Undo/Redo works within the context of a Mode. Each Mode in each Screen keeps its

own record. Settings in the Control Panel or System Settings menus are not

undoable.

There are several actions that may change many parameters. Among these are Auto

Tune, and Adjust Atten for Min Clipping. After executing such a function, Undo sets

all parameters back to their value before the function was selected. Auto Tune

appears to be a single action, even though the instrument executes it in several

steps.

Redo reverses the effect of the last Undo action, assuming that no other settings

have been changed since the last Undo. Changing a setting after an Undo clears

memory of all settings after that Undo, that is, it clears the Redo stack, as explained

above.

Short Range Comms & IoT Mode User's &Programmer's Reference 139

Keysight x-series Instruction Manual

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