B&K Precision 4052-4055 - Manual - Manual (Page 46)

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10. Use the function key to toggle selection between Linear or Logarithmic sweep. You
can see which type is selected from the waveform display area.
Linear Sweep Logarithmic Sweep
11. The direction of the sweep can be changed by toggling the function key
corresponding to the Direction option.
Linear Down Direction Logarithmic Down Direction
The up arrow means the sweep will be in the normal direction (sweep
up).
The down arrow means the sweep will be in the reverse direction
(sweep down).