measurements of voltages from specially protected secondary circuits. Such voltage
measurements include signal levels, special hardware, limited-energy parts of hardware,
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 (MAINS
3
). 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 Measurement Category II are
measurements performed on household appliances, portable tools, and similar hardware.
•
Measurement Category III is for measurements performed in the building installation at the
distribution level. This category refers to measurements on hard-wired hardware such as
hardware 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.
•
Measurement Category IV is for measurements performed at the primary electrical supply
installation typically outside buildings. Examples include electricity meters and
measurements on primary overcurrent protection devices and on ripple control units.
To obtain the safety certification(s) for this product, visit
ni.com/certification
, search by
model number or product line, and click the appropriate link in the Certification column.
Electromagnetic Compatibility Information
This product was tested and complies with the regulatory requirements and limits for
electromagnetic compatibility (EMC) stated in the product specifications. These requirements
and limits provide reasonable protection against harmful interference when the product is
operated in the intended operational electromagnetic environment.
This product is intended for use in industrial locations. However, harmful interference may
occur in some installations, when the product is connected to a peripheral device or test object,
or if the product is used in residential or commercial areas. To minimize interference with radio
and television reception and prevent unacceptable performance degradation, install and use this
product in strict accordance with the instructions in the product documentation.
Furthermore, any modifications to the product not expressly approved by National Instruments
could void your authority to operate it under your local regulatory rules.
Caution
To ensure the specified EMC performance, operate this product only with
shielded cables and accessories.
