Quantum Composers LDDC 1550 - Manual (Page 31)

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Safety Symbols
This section provides a description of the safety marking symbols that appear on the instrument.
These symbols provide information about potentially dangerous situations which can result in
death, injury, or damage to the instrument and other components.
Symbols
Publications; Descriptions & Comments
IEC 417, No. 5031
Direct current - VDC may be used on rating labels.
IEC 417, No. 5032
Alternating current - For rating labels, the symbol is typically
replaced by V and Hz as in 230V, 50Hz. DO NOT USE Vac.
IEC 417, No. 5017
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.
IEC 417, No. 5019
Protective 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 equipment .
IEC 417, No. 5020
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.
IEC 417, No. 5007
On (Supply) - Note that this symbol is a bar, normally applied in the vertical
orientation. It is not the number 1.
IEC 417, No. 5008
Off (Supply) - Note that this symbol is a true circle. It is not the number 0 or the
letter O.