National Instruments NI 9221 Manuale utente

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GETTING STARTED GUIDE

NI 9221

8 AI, ±60 V, 12 Bit, 800 kS/s Aggregate

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This document explains how to connect to the NI 9221. In this

document, the NI 9221 with screw terminal, NI 9221 with spring

terminal, and NI 9221 with DSUB are referred to inclusively as

the NI 9221.

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 9221. 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 9221 only as described in this document.

Caution Do not operate the NI 9221 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

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way. If the product is damaged, return it to NI for

repair.

Hazardous Voltage This icon denotes a warning

advising you to take precautions to avoid electrical

shock.

NI 9221 with Screw Terminal and NI 9221 with

Spring Terminal Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM ±60 VDC maximum

Channel-to-channel None

Channel-to-earth ground

Continuous 250 Vrms, Measurement

Category II

Withstand 2,300 Vrms, verified by a 5 s

dielectric withstand test

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

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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 9221 with screw

terminal or NI 9221 with spring terminal to signals or

use for measurements within Measurement Categories

III or IV.

NI 9221 with DSUB Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM ±60 VDC maximum

Channel-to-channel None

Channel-to-earth

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 Vrms, verified by a 5 s

dielectric withstand 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

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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.

Caution Do not connect the NI 9221 with DSUB to

signals or use for measurements within Measurement

Categories 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.

Safety Guidelines for Hazardous Voltages

You can connect hazardous voltages only to the NI 9221 with

screw terminal and the NI 9221 with spring terminal. Do not

connect hazardous voltages to the NI 9221 with DSUB.

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.

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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 9927 connector backshell kit with the NI 9221

with screw terminal and the NI 9981 connector

backshell kit with the NI 9221 with spring terminal to

ensure that the terminals are not accessible.

Safety Guidelines for Hazardous Locations

The NI 9221 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

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NI 9221 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.

Caution For Zone 2 applications, install a protection

device between the input signal and the NI 9221 input

terminal. The device must prevent the channel-to-COM

voltage from exceeding 85 V if there is a transient

overvoltage condition.

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Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9221 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO Certificate No. 03 ATEX 0324020X and is

IECEx UL 14.0089X certified. Each NI 9221 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 9221

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 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.

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