This oscilloscope can only be used for measurements within its specified
measurement categories.
Measurement Category Definitions
Measurement category I 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.
Ventilation Requirement
This oscilloscope uses fan to force cooling. Please make sure that the air intake and exhaust areas
are free from obstructions and have free air. When using the oscilloscope in a bench-top or rack
setting, provide at least 10 cm clearance beside, above and behind the instrument for adequate
ventilation.
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