B&K Precision 2552-2559 - Manual - Manual (Page 27)

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Universal Knob
You can use the Universal knob with many functions, such as adjusting
the hold off time, moving cursors, setting the pulse width, setting the
video line, adjusting the upper and lower frequency limit and adjusting X
and Y masks when using the pass/fail function. You can also turn the
Universal knob to adjust the storage position of setups, waveforms,
pictures when saving/recalling, and to select menu options. With some
functions, the light indicator above the knob will turn on to indicate that
the knob can be used to make changes or adjustments for that function.
The knob can also be pushed to make a selection after
changes/adjustments have been made.
Figure 14 - Universal Knob