NI 9228 User manual

GETTING STARTED GUIDE
NI 9228
8 AI, ±60 V, 24 Bit, 1 kS/s/ch Simultaneous

This document explains how to connect to the NI 9228.
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 9228. 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 9228 only as described in this document.
Caution Do not operate the NI 9228 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.
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
Up to 5,000 m altitude
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms, verified by a 5 s
dielectric test
NI 9228 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
Up to 5,000 m altitude
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms , verified by a 5 s
dielectric test
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 If using in Division 2 or Zone 2 hazardous
locations applications, do not connect the NI 9228 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 not
intended for direct connection to the MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT 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 9228 to signals or use
for measurements within Measurement Categories III
or IV.
NI 9228 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 9939 screw terminal connector backshell kit to
ensure that the terminals are not accessible.
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Safety Guidelines for Hazardous Locations
The NI 9228 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 9228 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 9228 Getting Started Guide | © National Instruments | 7

Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9228 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 12 ATEX 1202658X and is IECEx UL 14.0089X
certified. Each NI 9228 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 9228 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/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.
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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.
NI 9228 Getting Started Guide | © National Instruments | 9

Caution Electrostatic Discharge (ESD) can damage
the NI 9228. To prevent damage either install the
NI 9939 screw terminal connector backshell kit or
employ industry-standard ESD prevention measures
during installation, maintenance, and operation.
Caution To ensure the specified EMC performance,
operate this product with twisted-pair cables.
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
input/output ports. In addition, take precautions when
10 | ni.com | NI 9228 Getting Started Guide

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 9228
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.
NI 9228 Getting Started Guide | © National Instruments | 11

NI 9228 Pinout
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
AI4+
AI4–
AI5+
AI5–
AI6+
AI6–
AI7+
AI7–
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
Grounded Connections
NI 9228
Signal
Source
AI–
+
–
AI+
Make sure the voltage on the AI+ and AI- connections are in the
channel-to-earth safety voltage range to ensure proper operation.
NI 9228 Getting Started Guide | © National Instruments | 13

Floating Connections
NI 9228
Signal
Source
AI–
+
AI+
–
NI 9228 Connection Guidelines
• Make sure that devices you connect to the NI 9228 are
compatible with the module specifications.
• You must use 2-wire ferrules to create a secure connection
when connecting more than one wire to a single terminal on
the NI 9228.
Wiring the NI 9939
Caution For safe operation with hazardous voltages,
you must use the NI 9939 screw terminal connector
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backshell kit with the 16-position screw terminal
connector on the NI 9228.
When connecting all 16 terminals, the total maximum wire
diameter including insulation must not exceed 2.3 mm (0.09 in.)
per wire in order to fit through the 11.0 mm (0.43 in.) opening on
the NI 9939.
When connecting all 16 terminals using the cable retainer, the
total maximum wire diameter including insulation must not
exceed 1.6 mm (0.06 in.) per wire in order to fit under the
7.6 mm (0.30 in.) clearance of the NI 9939 cable retainer.
Figure 1. NI 9939 Wire Clearance Dimensions
11 mm (0.43 in.)
7.6 mm (0.30 in.)
Complete the appropriate procedure based on the total maximum
wire diameter used.
NI 9228 Getting Started Guide | © National Instruments | 15

Installing the NI 9939
What to Use
• NI 9939 screw terminal connector backshell kit
• 0.05 mm2 to 1.5 mm2 (30 AWG to 14 AWG) wire with 6 mm
(0.24 in.) of the insulation stripped
• Slotted screwdriver
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What to Do
2
3
5
4
1
1. Insert the stripped end of the wire fully into the appropriate
terminal on the 16-Position Screw Terminal Connector (2)
and tighten the screw. Make sure no exposed wire extends
past the screw terminal.
NI 9228 Getting Started Guide | © National Instruments | 17

2. Route the wire through the NI 9939 opening and remove
slack from the wiring.
3. Install the Backshell Top Enclosure (1) to the Backshell
Bottom Enclosure (3).
4. Place the Label (5) in the Label Carrier (4) and attach onto
the backshell.
Installing the NI 9939 Using the Cable Retainer
What to Use
• NI 9939 screw terminal connector backshell kit
• 0.05 mm2 to 1.5 mm2 (30 AWG to 14 AWG) wire with 6 mm
(0.24 in.) of the insulation stripped
• Slotted screwdriver
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What to Do
1
2
3
5
4
7
6
1. Insert the stripped end of the wire fully into the appropriate
terminal on the 16-Position Screw Terminal Connector (2)
NI 9228 Getting Started Guide | © National Instruments | 19

and tighten the screw. Make sure no exposed wire extends
past the screw terminal.
2. Route the wire through the NI 9939 opening, remove slack
from the wiring, and secure wires using the Cable Retainer
(6) and tighten the Screws (7).
3. Install the Backshell Top Enclosure (1) to the Backshell
Bottom Enclosure (3).
4. Place the Label (5) in the Label Carrier (4) and attach onto
the backshell.
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends
that you follow these guidelines to protect connections to the
NI 9228:
• Use ferrules to terminate wires to the detachable connector.
• Use the NI 9939 screw terminal connector backshell kit.
Overvoltage Protection
The NI 9228 provides overvoltage protection for each channel.
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