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Getting Started with the NI PCIe-8233
distribution systems. The following is a description of
Measurement (Installation
1
) Categories:
•
Measurement Category I is for measurements performed on
circuits
not
directly connected to the electrical distribution
system referred to as MAINS
2
voltage. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels,
special equipment, limited-energy parts of equipment, circuits
powered by regulated low-voltage sources, and electronics.
•
Measurement 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 (e.g., 115 V for U.S.
or 230 V for Europe). Examples of Measurement Category II
are measurements performed on household appliances,
portable tools, and similar products.
1
Measurement Category is also referred to as Installation Category.
2
MAINS is defined as the (hazardous live) electrical supply system to which
equipment is designed to be connected for the purpose of powering the equipment.
Suitably rated measuring circuits may be connected to the MAINS for measuring
purposes.
