Greenlee DM-40 Manuel D'instructions page 14

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Measurement Categories
These definitions were derived from the international safety standard
for insulation coordination as it applies to measurement, control, and
laboratory 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 photocopiers 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 9000 (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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