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1.2 Definition of Measurement Categories (CAT)
CAT IV:
Corresponds to measurements performed at the primary
electrical supply (< 1000 V).
Example: primary overcurrent protection devices, ripple
control units, and meters.
CAT III:
Corresponds to measurements performed in the building
installation at the distribution level.
Example: hardwired equipment in fixed installation and
circuit breakers.
CAT II:
Corresponds to measurements performed on circuits
directly connected to the electrical distribution system.
Example: measurements on household appliances and
portable tools.
1.3 Precautions for Use
ƒ This instrument complies with safety standard IEC 61010-1.
ƒ For your own safety, and to prevent any damage to your
instrument, you must follow the instructions given in this
manual.
ƒ This instrument can be used on CAT IV electrical circuits not
exceeding 600 V with respect to earth. It must be used indoors,
in an environment not exceeding pollution level 2, at an
altitude of not more than 6562 ft (2000 m). The instrument can
therefore be used in complete safety on (40 to 850) V three-
phase networks in an industrial environment.
ƒ For safety reasons, you must use only measurement leads
having a voltage rating and category at least equal to those of
the instrument and compliant with standard IEC 61010-031.
ƒ Do not use if the housing is damaged or not correctly closed.
ƒ Do not place your fingers near unused terminals.
ƒ If the instrument is used other than as specified in this manual,
the protection provided by the instrument may be impaired.
Phase & Motor Rotation Meter Model 6611
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