Safety Information
5
Measurement categories
This HiLogger complies with CAT II (300 VAC, DC) safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes safety
standards for various 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.
Difference between "Measurement" and "Recording"
The measurement and recording processes are distinguished as follows for the purposes
of these instructions.
Measured data (data acquired in internal memory) is erased whenever a new measure-
ment starts. To retain data, always record (save) it.
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 primary overcurrent protection device (distribution panel).
Measurement: The acquisition of input values into internal HiLogger memory or to a PC via
communications.
Recording : Storing measurement data on a CF card, USB flash drive or on a PC via data
communication.
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