National Instruments NI 9250 Manual de usuario

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GETTING STARTED GUIDE

NI 9250 with BNC

2 AI, ±5 V, 24 Bit, 102.4 kS/s/ch Simultaneous

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This document explains how to connect to the NI 9250 with

BNC.

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 9250 with BNC. 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 9250 with BNC only as described in this

document.

Caution Do not operate the NI 9250 with BNC 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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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.

Caution Do not connect the NI 9250 with BNC to

signals or use for measurements within Measurement

Categories II, III, or IV.

Safety Guidelines for Hazardous Locations

The NI 9250 with BNC 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 9250 with BNC 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.

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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.

Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9250 with BNC has been evaluated as Ex nA IIC T4 Gc

equipment under DEMKO 12 ATEX 1202658X and is IECEx

UL 14.0089X certified. Each NI 9250 with BNC 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 9250 with BNC 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.

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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/EN 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.

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.

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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.

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 Electromagnetic interference can adversely

affect the measurement accuracy of the NI 9250 with

BNC. The input ports of this device are not protected

for electromagnetic interference. As a result, this

device may experience reduced input or other

temporary performance degradation when connected

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cables are routed in an environment with conducted

radio frequency electromagnetic interference.

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

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.

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Preparing the Environment

Ensure that the environment in which you are using the NI 9250

with BNC 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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