6
Safety Information
Symbols on the instrument
Indicates cautions and hazards.
When the symbol is printed on the
instrument, refer to a corresponding
topic in the Instruction Manual.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates the ON side of the power
switch.
Indicates the OFF side of the power
switch.
Symbols for standards
Indicates the Waste Electrical and
Electronic Equipment Directive
(WEEE Directive) in EU member
states.
Indicates that the product conforms
to regulations set out by the EC
Directive.
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards
for various electrical environments, categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
•
Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
•
Using a measuring instrument without categories in an environment designated
with the CAT II to CAT IV category could result in a severe accident, and must
be carefully avoided.
This instrument conforms to the safety requirements for CAT II 300 V measuring instruments.
CAT II:
When directly measuring the electrical outlet receptacles of the primary electrical
circuits in equipment connected to an AC electrical outlet by a power cord (portable
tools, household appliances, etc.).
CAT III:
When measuring the primary electrical circuits of heavy equipment (fixed installations)
connected directly to the distribution panel, and feeders from the distribution panel to
outlets.
CAT IV:
When measuring the circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution panel).
T
Outlet
CAT II
Internal wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed installation
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