National Instruments NI 9222 User manual

NI-9222
Getting Started
2023-08-02

Contents
NI-9222 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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NI-9222 Getting Started

NI-9222 Getting Started
Connector Types
The NI-9222 has more than one connector type: NI-9222 with screw terminal and
NI-9222 with BNC. Unless the connector type is specified, NI-9222 refers to all
connector types.
NI-9222 Block Diagram
NI-9222
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
■ Input signals on each channel are buered, conditioned, and then sampled
by an ADC.
■ Each AI channel provides an independent signal path and ADC, enabling
you to sample all channels simultaneously.
NI-9222 Pinout
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NI-9222 Getting Started

A I0+
A I0–
A I1+
A I1–
AI 2+
AI 2–
A I3+
A I3–
0
1
0
1
0
1
0
1
AI0+
AI0-
AI1+
AI1-
AI2+
AI2-
AI3+
AI3-
Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
Grounded Connections
NI-9222
AI–
+
–
AI+
Signal
Source
Make sure the voltage on the AI+ and AI- connections are in the channel-to-earth
safety voltage range to ensure proper operation.
Floating Connections
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NI-9222 Getting Started

NI-9222
Signal
Source
AI–
+
–
AI+
NI-9222 Connection Guidelines
■ Make sure that devices you connect to the NI-9222 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-9222 with screw terminal.
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-9222 with screw terminal:
■Use ferrules to terminate wires to the detachable connector.
■Use the NI-9971 backshell kit.
Cable Requirements for EMC Compliance
Select and install cables for the NI-9222 with screw terminal in accordance with the
following requirements:
■Connect the cable shield to the chassis ground (grounding screw of the
chassis) using the shortest length of wire possible.
■Use shielded, twisted-pair cables (Belden 9451 or equivalent).
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NI-9222 Getting Started

Figure 1. Cable Connections for NI-9222 with screw terminal for EMC Compliance
NI-9222
Shield
AI0+
AI0–
Signal
Source
Shield
AI1+
AI1–
Signal
Source
Shield
AI2+
AI2–
Signal
Source
Shield
AI3+
AI3–
Signal
Source
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NI-9222 Getting Started
© 2023 National Instruments Corporation.