Model 577 Operating Manual 25
13 Safety Marking Symbols
This section provides a description of the safety marking symbols that appear on the instrument. These symbols
provide information about potentially danger-ous situations which can result in death, injury, or damage to the
instrument and other components.
Earth (ground) terminal. Primarily used for functional
earth terminals which are generally associated with test
and measurement circuits. These terminals are not for
safety earthing purposes but provide an earth reference
point.
Protective Earthing conductor terminal. This symbol
is specifically reserved for the protective conductor
terminal and no other. It is placed at the equipment
earthing point and is mandatory for all grounded (Class
I) equipment.
Frame or chassis terminal. Used for points other than
protective conductor and functional earth terminals
where there is a connection to accessible conductive
terminals to advise the user of a chassis connection.
On (AC Mains) Located on the power switch at the rear
of the unit
Off (AC Mains) Located on the power switch at the rear
of the unit
Class II Equipment protected by double insulation or
reinforced insulation. The equipment typically does not
require a Safety Ground (Protective Ground).
Caution, risk of electric shock
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