National Instruments NI 9227 User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9227

4-Channel, 5 Arms, 24-Bit, Simultaneous,

Channel-to-Channel Isolated Analog Input Module

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2|ni.com |NI 9227 Operating Instructions and Specifications

This document describes how to use the National Instruments 9225

and includes specifications and pin assignments for the NI 9225.

Note The safety guidelines and specifications in this

document are specific to the NI 9225. The other

components in the system might not meet the same safety

ratings and specifications. Refer to the documentation for

each component in the system to determine the safety

ratings and specifications for the entire system.

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NI 9227 Operating Instructions and Specifications |© National Instruments |3

Safety Guidelines

Operate the NI 9227 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may

be hot. Touching this component may result in bodily

injury.

Hazardous Voltage This icon denotes a warning

advising you to take precautions to avoid electrical

shock.

Caution Do not operate the NI 9242 in a manner not

specified in this manual. 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 National Instruments

for repair.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the

following precautions. A hazardous voltage is a voltage greater

than 42.4 Vpk or 60 VDC to earth ground.

4|ni.com |NI 9227 Operating Instructions and Specifications

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 Make sure that devices and circuits connected

to the module are properly insulated from human contact.

NI 9227 Operating Instructions and Specifications |© National Instruments |5

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.

Figure 1 shows the NI 9971 connector backshell.

Figure 1. NI 9971 Connector Backshell

6|ni.com |NI 9227 Operating Instructions and Specifications

Connecting the NI 9227

The NI 9227 has four 2-terminal detachable screw-terminal

connectors that provide connections for four simultaneously

sampled, isolated analog input channels.

Figure 2. NI 9227 Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

NI 9227 Operating Instructions and Specifications |© National Instruments |7

You can connect ground-referenced or floating current sources to

the NI 9227. Connect the positive side of the current source to the

AI+ terminal, and connect the negative side of the current source

to the AI- terminal. If you make a ground-referenced connection

between the current source and the NI 9227, make sure the voltage

on the AI+ and AI- connections are in the channel-to-earth safety

voltage range to ensure proper operation of the NI 9227. Refer to

the Specifications section for more information about operating

voltages.

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 9227.

8|ni.com |NI 9227 Operating Instructions and Specifications

Refer to Figures 3 and 4 for illustrations of how to connect

grounded and floating current sources to the NI 9227.

Figure 3. Connecting a Grounded Current Source to the NI 9227

Figure 4. Connecting a Floating Current Source to the NI 9227

NI 9227

Current

Source

AI–

AI+

NI 9227

Current

Source

AI–

AI+

NI 9227 Operating Instructions and Specifications |© National Instruments |9

The NI 9227 analog input channels are floating with respect to

earth ground and each other. The incoming analog signal on each

channel is conditioned, buffered, and then sampled by a 24-bit

Delta-Sigma ADC.

Each channel provides an independent signal path and ADC,

enabling you to sample all four channels simultaneously. Refer

to Figure 5 for an illustration of the circuitry for one channel of

the NI 9227.

Figure 5. Input Circuitry for One Channel of the NI 9227

NI 9227

AI+

AI–

ADC

Amplifier

Shunt

Resistor

Prefilter

10 |ni.com |NI 9227 Operating Instructions and Specifications

Wiring for High-Vibration Applications

If an application is subject to high vibration, National Instruments

recommends that you either use ferrules to terminate wires to the

detachable screw-terminal connector or use the NI 9971 backshell

kit to protect the connections. Refer to Figure 6 for an illustration

of using ferrules. Refer to Figure 1 for an illustration of the

NI 9971 connector backshell.

Figure 6. 2-Terminal Detachable Screw-Terminal Connector with Ferrule

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