Reference; Oscilloscope Measurement Category; Measurement Category Definitions - Agilent Technologies 4000 X-Series User Manual

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Reference

Oscilloscope Measurement Category

The InfiniiVision oscilloscopes are intended to be used for measurements
in Measurement Category I.
Use this instrument only for measurements within its specified measurement
WA R N I N G
category.

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.
368 Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide