National Instruments NI-9232 User manual
NI-9232 Getting
Started
2022-07-06
Contents
Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cable Requirements for EMC Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting the NI-9232. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Signal Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring for High-Vibration Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ni.com
2
NI-9232 Getting Started
Before You Begin
Read the NI-9232 Safety, Environmental, and Regulatory Information and
complete the soware and hardware installation procedures in your chassis
documentation.
Safety Guidelines
Caution Observe all instructions and cautions in the user documentation.
Using the product in a manner not specified can damage the product and
compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
Safety Voltages
Connect only voltages that are within the following limits.
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC, Measurement Category I
Withstand 1,000 V RMS, verified by a 5 s dielectric withstand test
Safety Guidelines for Hazardous Locations
The NI-9232 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;
© National Instruments 3
NI-9232 Getting Started
and nonhazardous locations only. Follow these guidelines if you are installing the
NI-9232 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 o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o 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.
Caution For Division 2 and Zone 2 applications, connected signals must
be within the following limits.
Capacitance 0.2 µF maximum
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI-9232 has been evaluated as Ex nA IIC T4 Gc equipment under
DEMKO 12ATEX 1202658X and is IECEx UL 14.0089X certified. Each NI-9232 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-9232 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.
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NI-9232 Getting Started
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.
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.
Notice To ensure the specified EMC performance, operate this product
only with shielded cables and accessories. Do not use unshielded cables or
© National Instruments 5
NI-9232 Getting Started
accessories unless they are installed in a shielded enclosure with properly
designed and shielded input/output ports and connected to the product
using a shielded cable. If unshielded cables or accessories are not properly
installed and shielded, the EMC specifications for the product are no
longer guaranteed.
Caution Electrostatic Discharge (ESD) can damage the NI-9232. To
prevent damage, use industry-standard ESD prevention measures during
installation, maintenance, and operation.
Caution To ensure the specified EMC performance for the NI-9232 with
screw terminal, you must install clamp-on ferrite beads (part number
782802-01) in accordance with the product installation instructions. Refer
to the NI-9232 product page on ni.com for purchasing information about
clamp-on ferrite beads.
Notice To ensure the specified EMC performance, the length of all I/O
cables must be no longer than 3 m (10 ).
Cable Requirements for EMC Compliance
Select and install cables for the NI-9232 in accordance with the following
requirements:
■Connect the cable shield to the chassis ground (grounding screw of the
chassis).
■For the NI-9232 with screw terminal, install a clamp-on ferrite bead (part
number 782802-01) on the input cable for each channel that you are
connecting to on the NI-9232.
■For the NI-9232 with screw terminal, clamp-on ferrite beads must be
installed on the cable as close to the module as possible. Placing the ferrite
elsewhere on the cable noticeably impairs its eectiveness.
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NI-9232 Getting Started
Figure 1. Cable Connections for EMC Compliance
NI 9232
with Screw Terminal
Shield
AI0+
AI0-
Ferrite
Shield
AI1+
AI1-
Ferrite
Shield
AI2+
AI2-
Ferrite
Signal
Source
Signal
Source
Signal
Source
Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications. To verify marine
approval certification for a product, visit ni.com/product-certifications, search by
model number, and click the appropriate link.
Notice In order to meet the EMC requirements for marine applications,
install the product in a shielded enclosure with shielded and/or filtered
power and 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-9232 meets the following
specifications.
Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C
Operating humidity (IEC 60068-2-30) 10% RH to 90% RH, noncondensing
Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
© National Instruments 7
NI-9232 Getting Started
Note Refer to the NI-9232 Specifications on ni.com/manuals for
complete specifications.
Connecting the NI-9232
The NI-9232 provides connections to three simultaneously sampled analog input
channels.
Figure 2. NI-9232 Pinout
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
0
1
0
1
0
1
AI0–
AI0+
AI1–
AI1+
AI2–
AI2+
Note You must use 2-wire ferrules to create a secure connection when
connecting more than one wire to a single terminal on the NI-9232 with
screw terminal.
Each channel has a terminal to which you can connect a signal source. The AI+
terminal of the connector provides the DC excitation, when enabled, and the
positive input signal connection. The AI- terminal provides the excitation return
path and the signal ground reference.
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
Table 1. Signal Descriptions
Connecting Signal Sources
You can connect ground-referenced or floating signal sources to the NI-9232.
ni.com
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NI-9232 Getting Started
If you make a ground-referenced connection between the signal source and the
NI-9232, make sure the voltage on the AI+ and the AI- connections are in the
channel-to-earth safety voltage range to ensure proper operation of the NI-9232.
Refer to the device datasheet on ni.com/manuals for more information about
operating voltages and overvoltage protection.
Figure 3. Connecting a Grounded Signal Source
NI 9232
AI+
AI-
+
–
Signal
Source
Common
Mode
Voltage
Figure 4. Connecting a Floating Signal Source
NI 9232
AI+
AI-
+
–
Signal
Source
Integrated Electronic Piezoelectric (IEPE) Sensors
The NI-9232 provides an IEPE excitation current for each channel to measure the
IEPE sensors. Typical IEPE sensors have a case that is electrically isolated from the
IEPE electronics. As a result, connecting the sensor to the NI-9232 results in a
floating connection even though the case of the sensor is grounded.
Wiring for High-Vibration Applications
If your application is subject to high vibration, NI recommends that you follow these
guidelines to protect connections to the NI-9232 with screw terminal:
■Use ferrules to terminate wires to the detachable connector.
■Use the NI 9971 backshell kit.
Where to Go Next
© National Instruments 9
NI-9232 Getting Started
NI Services
Visit ni.com/support to find support resources including documentation,
downloads, and troubleshooting and application development self-help such as
tutorials and examples.
Visit ni.com/services to learn about NI service oerings such as calibration options,
repair, and replacement.
Visit ni.com/register to register your NI product. Product registration facilitates
technical support and ensures that you receive important information updates from
NI.
NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX,
78759-3504, USA.
ni.com
10
NI-9232 Getting Started
© 2022 National Instruments Corporation.
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