Measurement Category - Keysight U1242C Service Manual

Measurement Category

The U1241C/U1242C has safety ratings of CAT III 1000 V and CAT IV 600 V.
Measurement CAT I
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 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
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
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
Use only the product rated Measurement Category on the location of measuring
circuits as identified below.
6
Measurements performed on circuits not directly
Measurements performed in the building installation.
Measurements performed at the source of the
Keysight U1241C/U1242C Service Guide