RIGOL
X MSO4000/DS4000 User’s Guide
Measurement Category
MSO4000/DS4000 series digital oscilloscopes can make measurements in
measurement category I.
WARNING
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 limit capability of the
equipment is made known to the user.
Measurement category II is for measurements performed on circuits directly
connected to a low voltage installation. Examples are measurements on household
appliances, portable tools and similar equipment.
Measurement category III is for 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, 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 a
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
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