International Electrical Symbols; Definition Of Measurement Categories - AEMC DTR 8510 User Manual

1.1

International Electrical Symbols

Signifies that the instrument is protected by double or reinforced insulation.
CAUTION - Risk of Danger! Indicates a WARNING and that the operator must
refer to the user manual for instructions before operating the instrument in all
cases where this symbol is marked.
Risk of electric shock. The voltage at the parts marked with this symbol may
be dangerous.
Ground/Earth
Important instructions to read and understand completely.
Important information to acknowledge.
Battery
Fuse
USB socket
Compliance with the Low Voltage & Electromagnetic Compatibility European
directives (73/23/CEE & 89/336/CEE)
In the European Union, this product is subject to a separate collection system
for recycling electrical and electronic components In accordance with directive
WEEE 2002/96/EC
1.2

Definition of Measurement Categories

CAT II: For measurements performed on circuits directly connected to
the electrical distribution system. Examples are measurements on
household appliances or portable tools.
CAT III: For measurements performed in the building installation at the distri-
bution level such as on hardwired equipment in fixed installation and
circuit breakers.
CAT IV: For measurements performed at the primary electrical supply
(<1000V) such as on primary overcurrent protection devices, ripple
control units, or meters.
4
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