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Chapter 1 Introduction
© National Instruments Corporation 1-9 NI 7831R User Manual
Safety Information
The following section contains important safety information that you must
follow when installing and using the NI 7831R.
Do not operate the NI 7831R in a manner not specified in this document.
Misuse of the NI 7831R can result in a hazard. You can compromise the
safety protection built into the NI 7831R if the NI 7831R is damaged in any
way. If the NI 7831R is damaged, return it to NI for repair.
Do not substitute parts or modify the NI 7831R except as described in this
document. Use the NI 7831R only with the chassis, modules, accessories,
and cables specified in the installation instructions. You must have all
covers and filler panels installed during operation of the NI 7831R.
Do not operate the NI 7831R in an explosive atmosphere or where there
might be flammable gases or fumes. If you must operate the NI 7831R in
such an environment, it must be in a suitably rated enclosure.
If you need to clean the NI 7831R, use a soft, nonmetallic brush. Make sure
that the NI 7831R is completely dry and free from contaminants before
returning it to service.
Operate the NI 7831R only at or below Pollution Degree 2. Pollution is
foreign matter in a solid, liquid, or gaseous state that can reduce dielectric
strength or surface resistivity. The following is a description of pollution
degrees:
• Pollution Degree 1—No pollution or only dry, nonconductive
pollution occurs. The pollution has no influence.
• Pollution Degree 2—Only nonconductive pollution occurs in most
cases. Occasionally, however, a temporary conductivity caused by
condensation can be expected.
• Pollution Degree 3—Conductive pollution occurs, or dry,
nonconductive pollution occurs that becomes conductive due to
condensation.
You must insulate signal connections for the maximum voltage for which
the NI 7831R is rated. Do not exceed the maximum ratings for the
NI 7831R. Do not install wiring while the NI 7831R is live with electrical
signals. Do not remove or add connector blocks when power is connected
to the system. Remove power from signal lines before connecting them to
or disconnecting them from the NI 7831R.