National Instruments NI 9251 Manuale utente

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GETTING STARTED GUIDE

NI 9251 with mini XLR

2 AI, 3 Vrms, 24 Bit, 102.4 kS/s/ch

Simultaneous, AC/DC Coupling

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This document explains how to connect to the NI 9251 with mini

XLR.

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 9251 with mini XLR. 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 9251 with mini XLR only as described in this

document.

Caution Do not operate the NI 9251 with mini XLR

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

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damaged in any way. If the product is damaged, return

it to NI for repair.

Safety Voltages

Connect only voltages that are within the following limits:

Channel-to-earth ground ±30 V maximum,

Measurement Category I

Isolation

Channel-to-channel None

Channel-to-earth ground None

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 Do not connect the NI 9251 with mini XLR

to signals or use for measurements within Measurement

Categories II, III, or IV.

Safety Guidelines for Hazardous Locations

The NI 9251 with mini XLR 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 9251 with mini XLR 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.

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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.

Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9251 with mini XLR has been evaluated as Ex nA IIC T4

Gc equipment under DEMKO Certificate No. 12 ATEX

1202658X and is IECEx UL 14.0089X certified. Each NI 9251

with mini XLR 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 9251 with mini XLR 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.

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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.

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

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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.

Caution To ensure the specified EMC performance,

operate this product only with shielded cables and

accessories.

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

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input/output ports. In addition, take precautions when

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 9251

with mini XLR 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.

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Connecting the NI 9251 with mini XLR

The NI 9251 with mini XLR provides connections for two analog

input channels.

Figure 1. NI 9251 with mini XLR Pinout

Chassis GND

AI0–

AI0+

AI1–

AI1+

Chassis GND

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