176 U1253B User’s and Service Guide
7 Specifications
Measurement Category
The Agilent U1253B True RMS OLED Multimeter has a safety
rating of CAT III 1000 V/ CAT IV, 600 V.
Measurement category definition
Measurement CAT I are measurements performed on circuits
which are not directly connected to the AC mains. For
example, measurements on circuits not derived from the AC
mains or specially protected (internal) mains- derived
circuits.
Measurement CAT II are measurements performed on circuits
that are directly connected to a low voltage installation. For
example, measurements on household appliances, portable
tools and other similar equipment.
Measurement CAT III are measurements performed on
building installations. For example, measurements on
distribution boards, circuit- breakers, wiring (including
cables), bus- bars, junction boxes, switches, socket outlets
within the fixed installation, equipment for industrial use
and equipment that is permanently connected to the fixed
installation such as stationary motors.
Measurement CAT IV are measurements performed at the
source of the low- voltage installation. For example,
measurements on electricity meters, primary over- current
protection devices and ripple control units.
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