National Instruments NI-9238 Manual de usuario
GETTING STARTED GUIDE
NI 9238
4 AI, ±500 mV, 24 Bit, 50 kS/s/ch Simultaneous
This document explains how to connect to the NI 9238.
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 9238. 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 9238 only as described in this document.
Caution Do not operate the NI 9238 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 damaged in any
way. If the product is damaged, return it to NI for
repair.
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Hazardous Voltage This icon denotes a warning
advising you to take precautions to avoid electrical
shock with the NI 9238.
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel isolation
Up to 2,000 m altitude
Continuous 250 Vrms, Measurement
Category II
Withstand 1,500 Vrms, verified by a 5 s
dielectric test
2,001 m to 5,000 m altitude
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 VDC
NI 9238 Getting Started Guide | © National Instruments | 3
Channel-to-earth ground isolation
Up to 2,000 m altitude
Continuous 250 Vrms, Measurement
Category II
Withstand 3,000 Vrms, verified by a 5 s
dielectric test
2,001 m to 5,000 m altitude
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 VDC
Division 2 and Zone 2
hazardous locations
applications (Channel-to-
channel and channel-to-
earth ground)
60 VDC, Measurement
Category I
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
4| ni.com | NI 9238 Getting Started Guide
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution If using in Division 2 or Zone 2 hazardous
locations applications, do not connect the NI 9238 to
signals or use for measurements within Measurement
Categories II, III, or IV.
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for
U.S. or 230 V for Europe.
Caution Do not connect the NI 9238 to signals or use
for measurements within Measurement Categories III
or IV.
Note Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are not
intended for direct connection to the MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT IV.
NI 9238 Getting Started Guide | © National Instruments | 5
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the device, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk voltage or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Ensure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous
voltage LIVE (>42.4 Vpk/60 VDC), you must ensure
that devices and circuits connected to the module are
properly insulated from human contact. You must use
the NI 9971 connector backshell kit to ensure that the
terminals are not accessible.
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Safety Guidelines for Hazardous Locations
The NI 9238 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 9238 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.
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.
NI 9238 Getting Started Guide | © National Instruments | 7
Caution For Division 2 and Zone 2 applications,
connected voltage sources must be within 60 VDC to
earth ground.
Caution For Division 2 and Zone 2 applications,
install a protection device between the input signal and
the NI 9238 input terminal. The device must clamp all
voltage sources to no more than 40% above their rated
value or within 84 VDC to earth ground if there is a
transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9238 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 9238 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 9238
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.
8| ni.com | NI 9238 Getting Started Guide
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
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
NI 9238 Getting Started Guide | © National Instruments | 9
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
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.
10 | ni.com | NI 9238 Getting Started Guide
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