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Chapter 16 Reference
323
16.1 Measurement Category
Oscilloscope measurement category
Smart oscilloscopes are primarily used for measurements in Measurement Category I.
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)
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