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Safety Information
Caution
The following paragraphs contain important safety information you must follow when
installing and operating the UMI-7774/72 and all devices connecting to the UMI-7774/72.
Do not operate the device in a manner not specified in the documentation. Misuse of the device can result
in a hazard. You can compromise the safety protection built into the device. If the device is damaged in
any way, return the device to National Instruments for repair.
Keep away from live circuits. Do not remove equipment covers or shields unless you are trained to do
so. If signal wires are connected to the device, hazardous voltages can exist even when the equipment is
turned off. To avoid a shock hazard, do not perform procedures involving cover or shield removal unless
you are qualified to do so. Disconnect all field power prior to removing covers or shields.
If the device is rated for use with hazardous voltages (>30 V
safety earth-ground connection wire. See the device specifications for maximum voltage ratings.
Note
Although some signal lines on the UMI-7774/72 have optical isolation to reduce noise effects
and ground loops, the UMI-7774/72 does not include safety isolation features. Also, there is no
isolation between signals, connectors, or axes on the UMI-7774/72 unless otherwise noted.
Because of the danger of introducing additional hazards, do not substitute parts or modify the device.
Use the device only with the chassis, modules, accessories, and cables specified in the installation
instructions. All covers and filler panels must be installed while operating the device.
Do not operate the device in an explosive atmosphere or where flammable gases or fumes may be
present. If you must operate the device in such an environment, the device must be in a suitably rated
enclosure.
Operate the device only at or below Pollution Degree 2. Pollution consists of any foreign matter—solid,
liquid, or gas—that may 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 effect.
•
Pollution Degree 2—Normally only nonconductive pollution occurs. Occasionally, nonconductive
pollution becomes conductive because of condensation.
•
Pollution Degree 3—Conductive pollution or dry, nonconductive pollution occurs. Nonconductive
pollution becomes conductive because of condensation.
Clean the device and accessories by brushing off light dust with a soft, nonmetallic brush. Remove other
contaminants with a stiff, nonmetallic brush. The unit must be completely dry and free from
contaminants before returning it to service.
You must insulate signal connections for the maximum voltage for which the device is rated. Do not
exceed the maximum ratings for the device. Remove power from signal lines before connection to or
disconnection from the device.
Operate this device only at or below the installation category
Measurement circuits are subjected to working voltages
from the circuit they are connected to during the measurement or test. Installation categories establish
1
Installation categories, also referred to as measurement categories, are defined in electrical safety standard IEC 61010-1.
2
Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.
NI UMI-7774/72 User Guide and Specifications
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
, 42.4 V
, or 60 V
rms
pk
1
marked on the hardware label.
2
and transient stresses, such as overvoltage,
4
), it may require a
dc
ni.com
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