Reference
10
Keysight M9241/42/43A PXIe Oscilloscopes and M9240A AutoProbe Power Module Startup Guide
69
Measurement Category Definitions
The "Not rated for CAT II, III, IV" measurement category is for measurements
performed on circuits not directly connected to MAINS. Examples are
measurements on circuits not derived from MAINS, and specially protected
(internal) MAINS derived circuits. In the latter case, transient stresses are variable;
for that reason, the transient withstand capability of the equipment is made known
to the user.
Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation. Examples are measurements on
household appliances, portable tools and similar equipment.
Measurement category III is for measurements performed in the building
installation. 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, for
example, stationary motors with permanent connection to the fixed installation.
Measurement category IV is for measurements performed at the source of the
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
Product Markings
These symbols are used on the M9241/42/43A PXIe oscilloscopes.
WARNING
Use this instrument only for measurements within its specified measurement
category (not rated for CAT II, III, IV). No transient overvoltages allowed.
Symbol
Description
Caution, refer to accompanying documentation
Caution, hot surface
Avoid static discharge
This symbol indicates separate collection for electrical and electronic
equipment mandated under EU law as of August 13, 2005. All electric
and electronic equipment are required to be separated from normal waste
for disposal (Reference WEEE Directive 2002/96/EC).
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