International Electrical Symbols; Definition Of Measurement Categories - AEMC 6503 User Manual

1.1

International Electrical Symbols

1.2 Definition of Measurement Categories
CAT I: For measurements on circuits not directly connected to
CAT II: For measurements performed on circuits directly
CAT III: For measurements performed in the building installation
CAT IV: For measurements performed at the primary electrical
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This symbol signifies that the instrument is protected by double or
reinforced insulation.
This symbol on the instrument indicates a WARNING and that the
operator must refer to the user manual for instructions before
operating the instrument. In this manual, the symbol preceding
instructions indicates that if the instructions are not followed, bodily
injury, installation/sample and product damage may result.
Risk of electric shock. The voltage at the parts marked with this
symbol may be dangerous.
In conformity with WEEE 2002/96/EC
the AC supply wall outlet such as protected secondaries,
signal level, and limited energy circuits.
connected to the electrical distribution system. Examples
are measurements on household appliances or portable
tools.
at the distribution level such as on hardwired equipment in
fixed installation and circuit breakers.
supply (<1000V) such as on primary overcurrent protec-
tion devices, ripple control units, or meters.
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