HP 54645A, User'S And Service Manual

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To use the Entry and Select knobs
The Select knob (HP 54645D only) always changes the selected channel. In
most menus, its order is screen-oriented. In the simple pattern and advanced
pattern definition menus, it moves from the lowest to highest number on
clockwise rotation.
The Entry knob increments and decrements the selected field—for example,
glitch time and setup memory number. It also moves the selected cursor
when cursors are on. In menus where it doesn’t need to do these things (for
example, there is no field to increment or decrement, or cursors are turned
off), it adjusts the selected channel increment/decrement in a non-screen but
numerical order.
The Entry knob also occasionally duplicates the function of the Select knob.
Use the Entry knob to select channels, set trigger durations (ranges), and
select labels (HP 54645D only).
Front-Panel Overview
To use the Entry and Select knobs
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