National-instruments Module NI PXI-8250 Manuel d'utilisateur télécharger pdf (Page 11)

Chapter 1 Getting Started

NI PXI-8250 User Manual 1-4 ni.com

equipment, circuits powered by regulated low-voltage sources, and

electronics.

• Installation Category II is for measurements performed on circuits

directly connected to the electrical distribution system. This category

refers to local-level electrical distribution, such as that provided by a

standard wall outlet (for example, 115 AC voltage for U.S. or 230 AC

voltage for Europe). Examples of Installation Category II are

measurements performed on household appliances, portable tools, and

similar devices/modules.

• Installation Category III is for measurements performed in the building

installation at the distribution level. This category refers to

measurements on hard-wired equipment such as equipment in fixed

installations, distribution boards, and circuit breakers. Other examples

are wiring, including cables, bus bars, junction boxes, switches, socket

outlets in the fixed installation, and stationary motors with permanent

connections to fixed installations.

• Installation Category IV is for measurements performed at the primary

electrical supply installation (<1,000 V). Examples include electricity

meters and measurements on primary overcurrent protection devices

and on ripple control units.

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National-instruments Module NI PXI-8250 Manuel d'utilisateur Page 11