National Instruments NI 9225 Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9225

3-Channel, 300 Vrms, 24-Bit Simultaneous,

Channel-to-Channel Isolated Analog Input Module

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2|ni.com |NI 9225 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 9225 Operating Instructions and Specifications |© National Instruments |3

Safety Guidelines

Operate the NI 9225 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 9225 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.

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.

NI 9225 Operating Instructions and Specifications |© National Instruments |5

Figure 1 shows the NI 9971 connector backshell.

Figure 1. NI 9971 Connector Backshell

6|ni.com |NI 9225 Operating Instructions and Specifications

Safety Guidelines for Hazardous Locations

The NI 9225 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 9225 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 Zone 2 applications, install the system

in an enclosure rated to at least IP 54 as defined by

IEC 60529 and EN 60529.

NI 9225 Operating Instructions and Specifications |© National Instruments |7

Special Conditions for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for

marine applications. To verify Lloyd’s Register certification, visit

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission

requirements for marine applications, use shielded cables

and install the system in a metal enclosure. Suppression

ferrites must be installed on power supply inputs near

power entries to modules and controllers. Power supply

and module cables must be separated on opposite sides of

the enclosure and must enter and exit through opposing

enclosure walls.

8|ni.com |NI 9225 Operating Instructions and Specifications

Connecting the NI 9225

The NI 9225 has three 2-terminal detachable screw-terminal

connectors that provide connections for three simultaneously

sampled, isolated analog input channels.

Figure 2. NI 9225 Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

NI 9225 Operating Instructions and Specifications |© National Instruments |9

You can connect ground-referenced or floating signal sources to

the NI 9225. Connect the positive signal of the signal source to the

AI+ terminal, and connect the negative signal of the signal source

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

between the signal source and the NI 9225, 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 9225. Refer to

the Specifications section for more information about operating

voltages and overvoltage protection.

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 9225.

10 |ni.com |NI 9225 Operating Instructions and Specifications

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

grounded and floating signal sources to the NI 9225.

Figure 3. Connecting a Grounded Signal Source to the NI 9225

Figure 4. Connecting a Floating Signal Source to the NI 9225

NI 9225

Signal

Source

AI–

–

AI+

NI 9225

Signal

Source

AI–

–

AI+

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