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Safety Information
The following section contains important safety information that you must
follow when installing and using National Instruments DIO devices.
Do not operate the device in a manner not specified in this document.
Misuse of the DIO device can result in a hazard. You can compromise the
safety protection built into the DIO device if it is damaged in any way. If
the DIO device is damaged, return it to National Instruments for repair.
Do not substitute parts or modify the DIO device except as described in this
document. Use the DIO device 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 DIO device.
Do not operate the DIO device in an explosive atmosphere or where there
may be flammable gases or fumes. If you must operate the DIO device in
such an environment, it must be in a suitably rated enclosure.
If you need to clean the DIO device, use a soft, nonmetallic brush. Make
sure that the DIO device is completely dry and free from contaminants
before returning it to service.
Operate the DIO device 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:
•
•
•
You must insulate signal connections for the maximum voltage for which
the DIO device is rated. Do not exceed the maximum ratings for the DIO
device. Do not install wiring while the DIO device is live with electrical
signals. Do not remove or add connector blocks when power is connected
to the system. Avoid contact between your body and the connector block
signal when hot swapping modules. Remove power from signal lines
before connecting them to or disconnecting them from the DIO device.
NI 6520/6521 User Guide
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Pollution Degree 1 means no pollution or only dry, nonconductive
pollution occurs. The pollution has no influence.
Pollution Degree 2 means that only nonconductive pollution occurs in
most cases. Occasionally, however, a temporary conductivity caused
by condensation must be expected.
Pollution Degree 3 means that conductive pollution occurs, or dry,
nonconductive pollution occurs that becomes conductive due to
condensation.
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