National Instruments NI 9425 Manuale utente
GETTING STARTED GUIDE
NI 9425
24 V, 32-Channel (Sinking Input), 7 µs C Series
Digital Module
This document explains how to connect to the NI 9425. In this
document, the NI 9425 with spring terminal and the NI 9425 with
DSUB are referred to inclusively as the NI 9425.
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 9425. 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 9425 only as described in this document.
Caution This icon denotes a caution, which advises
you to consult documentation where this symbol is
marked.
2| ni.com | NI 9425 Getting Started Guide
Caution Do not operate the NI 9425 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.
Hazardous Voltage This icon denotes a warning
advising you to take precautions to avoid electrical
shock.
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 All wiring must be insulated for the highest
voltage used.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
NI 9425 Getting Started Guide | © National Instruments | 3
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.
NI 9425 with Spring Terminal Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels
simultaneously
±60 V maximum
All channels
simultaneously
±30 V maximum
Isolation
Channel-to-channel None
4| ni.com | NI 9425 Getting Started Guide
Channel-to-earth ground
Continuous 250 V RMS,
Measurement Category II
Withstand up to
5,000 m
3,000 V RMS, verified by a 5 s
dielectric withstand test
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 9425 with spring
terminal to signals or use for measurements within
Measurement Categories III or IV.
NI 9425 Getting Started Guide | © National Instruments | 5
NI 9425 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels
simultaneously
±60 V maximum
All channels
simultaneously
±30 V maximum
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC,
Measurement Category I
Withstand up to
2,000 m
1,000 V RMS, verified by a 5 s
dielectric withstand test
Withstand up to
5,000 m
500 V RMS, verified by a 5 s
dielectric withstand test
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
6| ni.com | NI 9425 Getting Started Guide
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.
Caution Do not connect the NI 9425 with DSUB to
signals or use for measurements within Measurement
Categories II, III, or IV.
Note Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are for
other circuits not intended for direct connection to the
MAINS building installations of Measurement
Categories CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI 9425 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
Gc and Ex nA IIC T4 Gc hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9425 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.
NI 9425 Getting Started Guide | © National Instruments | 7
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, or Zone 2.
Caution The system must be installed in an enclosure
certified for the intended hazardous (classified)
location, having a tool secured cover/door, where a
minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9425 with spring terminal has been evaluated as Ex nA
IIC T4 Gc equipment under DEMKO 12 ATEX 1202658X and is
IECEx UL 14.0089X certified. The NI 9425 with DSUB has been
evaluated as Ex nA IIC T4 Gc equipment under DEMKO 03
ATEX 0324020X and is IECEx UL 14.0089X certified. Each
NI 9425 is marked II 3G and is suitable for use in Zone 2
8| ni.com | NI 9425 Getting Started Guide
hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤
70 °C. If you are using the NI 9425 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 Transient protection shall be provided that is
set at a level not exceeding 140% of the peak rated
voltage value of 85 V at the supply terminals to the
equipment.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC/EN 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.
NI 9425 Getting Started Guide | © National Instruments | 9
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
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.
10 | ni.com | NI 9425 Getting Started Guide
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