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4 Installation and User’s Guide
Safety Symbols and Instrument Markings
Symbols and markings in documentation and on instruments alert you to
potential risks, provide information about conditions, and comply with
international regulations. Table A defines the safety symbols and Table B
on page 5 defines the instrument markings you may find in the
documentation or on an instrument.
Table A Safety Symbols
Symbols Definition
Warning: risk of electric shock.
Warning: hot surface.
Caution: refer to instrument documentation.
Laser radiation symbol: marked on products that have a laser
output.
Alternating current.
Both direct and alternating current.
Three-phase alternating current.
Earth (ground) terminal.
Protective earth (ground) terminal.
Frame or chassis terminal.
Terminal is at earth potential. Used for measurement and
control circuits designed to be operated with one terminal at
earth potential.
Terminal for neutral conductor on permanently installed
equipment.
Terminal for line conductor on permanently installed
equipment.