Agilent Technologies 89410A Service Manual page 7

Numeric Entries
Numeric values may be entered by using the numeric keys in the
lower right hand ENTRY area of the analyzer front panel. In this
book, values which are to be entered from these keys are indicted
only as numerals in the text, like this:
Press 50, [ ]
enter
Ghosted Softkeys
A softkey label may be shown in the menu when it is inactive. This
occurs when a softkey function is not appropriate for a particular
measurement or not available with the current analyzer
configuration. To show that a softkey function is not available, the
analyzer ''ghosts'' the inactive softkey label. A ghosted softkey
appears less bright than a normal softkey. Settings/values may be
changed while they are inactive. If this occurs, the new settings are
effective when the configuration changes such that the softkey
function becomes active.
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