National Instruments NI 9251 Manual de usuario
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Find the National Instruments NI 9251 at our website: Click HERE
GETTING STARTED GUIDE
NI 9251 with mini XLR
2 AI, 3 Vrms, 24 Bit, 102.4 kS/s/ch
Simultaneous, AC/DC Coupling
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This document explains how to connect to the NI 9251 with mini
XLR.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9251 with mini XLR. The other components in
the system might not meet the same safety ratings.
Refer to the documentation for each component in the
system to determine the safety and EMC ratings for the
entire system.
Safety Guidelines
Operate the NI 9251 with mini XLR only as described in this
document.
Caution Do not operate the NI 9251 with mini XLR
in a manner not specified in this document. Product
misuse can result in a hazard. You can compromise the
safety protection built into the product if the product is
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damaged in any way. If the product is damaged, return
it to NI for repair.
Safety Voltages
Connect only voltages that are within the following limits:
Channel-to-earth ground ±30 V maximum,
Measurement Category I
Isolation
Channel-to-channel None
Channel-to-earth ground None
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live
electrical supply system that powers equipment. This category is
for measurements of 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.
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Caution Do not connect the NI 9251 with mini XLR
to signals or use for measurements within Measurement
Categories II, III, or IV.
Safety Guidelines for Hazardous Locations
The NI 9251 with mini XLR is suitable for use in Class I,
Division 2, Groups A, B, C, D, T4 hazardous locations; Class I,
Zone 2, AEx nA IIC T4 and Ex nA IIC T4 hazardous locations;
and nonhazardous locations only. Follow these guidelines if you
are installing the NI 9251 with mini XLR in a potentially
explosive environment. Not following these guidelines may result
in serious injury or death.
Caution Do not disconnect I/O-side wires or
connectors unless power has been switched off or the
area is known to be nonhazardous.
Caution Do not remove modules unless power has
been switched off or the area is known to be
nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
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Caution For Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9251 with mini XLR has been evaluated as Ex nA IIC T4
Gc equipment under DEMKO Certificate No. 12 ATEX
1202658X and is IECEx UL 14.0089X certified. Each NI 9251
with mini XLR is marked II 3G and is suitable for use in Zone
2 hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤
70 °C. If you are using the NI 9251 with mini XLR in Gas Group
IIC hazardous locations, you must use the device in an NI chassis
that has been evaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC
T4, or Ex nL IIC T4 equipment.
Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
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Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
stated in the product specifications. These requirements and
limits provide reasonable protection against harmful interference
when the product is operated in the intended operational
electromagnetic environment.
This product is intended for use in industrial locations. However,
harmful interference may occur in some installations, when the
product is connected to a peripheral device or test object, or if the
product is used in residential or commercial areas. To minimize
interference with radio and television reception and prevent
unacceptable performance degradation, install and use this
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product in strict accordance with the instructions in the product
documentation.
Furthermore, any changes or modifications to the product not
expressly approved by National Instruments could void your
authority to operate it under your local regulatory rules.
Caution To ensure the specified EMC performance,
operate this product only with shielded cables and
accessories.
Caution To ensure the specified EMC performance,
the length of all I/O cables must be no longer than 30 m
(100 ft).
Special Conditions for Marine Applications
Some products are Lloyd’s Register (LR) Type Approved for
marine (shipboard) applications. To verify Lloyd’s Register
certification for a product, visit ni.com/certification and search
for the LR certificate, or look for the Lloyd’s Register mark on
the product.
Caution In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
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input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
and cables to ensure that the desired EMC performance
is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI 9251
with mini XLR meets the following specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Operating humidity
(IEC 60068-2-78)
10% RH to 90% RH,
noncondensing
Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
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Connecting the NI 9251 with mini XLR
The NI 9251 with mini XLR provides connections for two analog
input channels.
Figure 1. NI 9251 with mini XLR Pinout
Chassis GND
AI0–
AI0+
AI1–
AI1+
Chassis GND
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