Table of Contents
Advertisement
standard impulse withstand voltage levels that commonly occur in electrical distribution systems. The
following is a description of installation categories:
•
Installation Category I is for measurements performed on circuits not directly connected to the
electrical distribution system referred to as MAINS
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.
•
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 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.
Electromagnetic Compatibility Information
This hardware has been tested and found to comply with the applicable regulatory requirements and
limits for electromagnetic compatibility (EMC) as indicated in the hardware's Declaration of
2
Conformity (DoC)
. These requirements and limits are designed to provide reasonable protection
against harmful interference when the hardware is operated in the intended electromagnetic
environment. In special cases, for example when either highly sensitive or noisy hardware is being used
in close proximity, additional mitigation measures may have to be employed to minimize the potential
for electromagnetic interference.
While this hardware is compliant with the applicable regulatory EMC requirements, there is no
guarantee that interference will not occur in a particular installation. To minimize the potential for the
hardware to cause interference to radio and television reception or to experience unacceptable
performance degradation, install and use this hardware in strict accordance with the instructions in the
hardware documentation and the DoC
If this hardware does cause interference with licensed radio communications services or other nearby
electronics, which can be determined by turning the hardware off and on, you are encouraged to try to
correct the interference by one or more of the following measures:
•
Reorient the antenna of the receiver (the device suffering interference).
•
Relocate the transmitter (the device generating interference) with respect to the receiver.
•
Plug the transmitter into a different outlet so that the transmitter and the receiver are on different
branch circuits.
1
MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may
be connected to the MAINS for measuring purposes.
2
The Declaration of Conformity (DoC) contains important EMC compliance information and instructions for the user or
installer. To obtain the DoC for this product, visit
and click the appropriate link in the Certification column.
© National Instruments Corporation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
1
voltage. This category is for measurements of
2
.
, search by model number or product line,
ni.com/certification
5
NI UMI-7774/72 User Guide and Specifications
Advertisement
Table of Contents
