Agilent Technologies 1660A Series User Reference page 133

The System Utilities
The System Utilities menu is used for setting system level parameters
such as the system clock, display intensity for each grey shade and
turning the sound on and off. In this menu you can also reflash the
"read only memory" chips (1660A through 1663A) with any new
revisions of the operating system.
The Utilities menu is one of the System subset menus and is accessed
through the System field in the upper left corner of the display.
System Utilities Menu (1660A through 1663A)
System Utilities Menu (1664A)
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