Characteristics and Specifications 5
Measurement Category
U1231A/U1232A/U1233A User’s Guide 105
Measurement Category
The Keysight U1231A/U1232A/U1233A Handheld Digital
Multimeters have a safety rating of CAT III, 600 V.
Measurement category definition
Measurement CAT I are for measurements performed on
circuits not directly connected to the AC mains. Examples
are measurements on circuits not derived from the AC mains
and specially protected (internal) mains- derived circuits.
Measurement CAT II are measurements performed on
circuits directly connected to a low- voltage installation.
Examples are measurements on household appliances,
portable tools, and similar equipment.
Measurement CAT III are measurements performed in
building installations. Examples are measurements on
distribution boards, circuit- breakers, wiring, including cables,
bus- bars, junction boxes, switches, socket outlets in the fixed
installation, and equipment for industrial use, and some
other equipment including stationary motors with permanent
connection to the fixed installation.
Measurement CAT IV are measurements performed at the
source of low- voltage installations. Examples are electricity
meters and measurements on primary over current
protection devices and ripple control units.
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