Chapter 1 Introduction
NI 781xR User Manual 1-8 ni.com
Safety Information
The following section contains important safety information that you must
follow when installing and using the NI 781xR.
Do not operate the NI 781xR in a manner not specified in this document.
Misuse of the NI 781xR can result in a hazard. You can compromise the
safety protection built into the NI 781xR if the NI 781xR is damaged in any
way. If the NI 781xR is damaged, return it to NI for repair.
Do not substitute parts or modify the NI 781xR except as described in this
document. Use the NI781xR 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 NI781xR.
Do not operate the NI 781xR in an explosive atmosphere or where there
might be flammable gases or fumes. If you must operate the NI 781xR in
such an environment, it must be in a suitably rated enclosure.
If you need to clean the NI781xR, use a soft, nonmetallic brush. Make sure
that the NI 781xR is completely dry and free from contaminants before
returning it to service.
Operate the NI781xR on ly 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 list describes 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 must 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 NI7 81xR is rated. Do not exceed the maximum ratings for the
NI7 81xR. Do not install wiring while the NI 781xR 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 781xR.