Greenlee DM-25 Instruction Manual download pdf (Page 14)

Measurement Categories

These deﬁnitions were derived from the international safety standard for

insulation coordination as it applies to measurement, control, and labora-

tory equipment. These measurement categories are explained in more detail

by the International Electrotechnical Commission; refer to either of their

publications: IEC 61010-1 or IEC 60664.

Measurement Category I

Signal level. Electronic and telecommunication equipment, or parts thereof.

Some examples include transient-protected electronic circuits inside photo-

copiers and modems.

Measurement Category II

Local level. Appliances, portable equipment, and the circuits they are plugged

into. Some examples include light ﬁxtures, televisions, and long branch circuits.

Measurement Category III

Distribution level. Permanently installed machines and the circuits they are

hard-wired to. Some examples include conveyor systems and the main circuit

breaker panels of a building’s electrical system.

Measurement Category IV

Primary supply level. Overhead lines and other cable systems. Some examples

include cables, meters, transformers, and other exterior equipment owned by

the power utility.

Statement of Conformity

Greenlee Textron Inc. is certiﬁed in accordance with ISO 9001 (2000) for our

Quality Management Systems.

The instrument enclosed has been checked and/or calibrated using equipment

that is traceable to the National Institute for Standards and Technology (NIST).

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Greenlee DM-25 Instruction Manual Page 14