Safety Notes
5
This instrument complies with CAT IV (600 V) safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes safety standards for vari-
ous electrical environments, categorized as CAT II to CAT IV, and called measurement categories.
Using a measurement 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.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV measurement applications
could result in a severe accident, and must be carefully avoided.
Measurement categories
CAT II: Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord
(portable tools, household appliances, etc.)
CAT II covers directly measuring electrical outlet receptacles.
CAT III: Primary electrical circuits of heavy equipment (fixed installations) connected directly to the
distribution panel, and feeders from the distribution panel to outlets.
CAT IV: The circuit from the service drop to the service entrance, and to the power meter and pri-
mary overcurrent protection device (distribution panel).
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