National Instruments NI 9218 Manual de usuario

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GETTING STARTED GUIDE

NI 9218

2 AI, 51.2 kS/s/ch Simultaneous, Universal

Measurements

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This document explains how to connect to the NI 9218. In this

document, the NI 9218 with LEMO and the NI 9218 with DSUB

are referred to inclusively as the NI 9218.

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 9218. 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 9218 only as described in this document.

Caution Do not operate the NI 9218 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.

NI 9218 with LEMO Safety Voltages

Connect only voltages that are within the following limits:

Maximum voltage,

from any pin to any pin

on a single connector1

±30 V

Isolation

Channel-to-channel, channel-to-Vsup, channel-to-earth,

Vsup-to-earth (up to 5,000 m)2

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 Vrms, verified by a 5 s

dielectric withstand test

1The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to

+30 V.

2Must use crimp contact LEMO plug (784162-01) to maintain these ratings.

Ratings are invalidated if solder version is used.

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Caution Any excitation output voltage to earth ground

must remain below 60 VDC for each channel. To

determine excitation output voltage to earth ground for

a channel, add the maximum excitation voltage to the

maximum potential on pin 3. The maximum excitation

voltages are 2 V +3% and 3.3 V +3% for the bridge

excitations, 12 V +5% for the +12 V excitation, and

22 V for the IEPE excitation.

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.

Caution Do not connect the NI 9218 to signals or use

for measurements within Measurement Categories II,

III, or IV.

Note Measurement Categories CAT I and CAT O are

equivalent. These test and measurement circuits are not

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intended for direct connection to the MAINS building

installations of Measurement Categories CAT II,

CAT III, or CAT IV.

NI 9218 with DSUB Safety Voltages

Connect only voltages that are within the following limits:

Maximum voltage,

from any pin to any pin

on a single connector3

±30 V

Isolation

Channel-to-channel, channel-to-Vsup inputs (up to 5,000 m)

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 Vrms, verified by a 5 s

dielectric withstand test

3The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to

+30 V.

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Channel-to-earth ground (up to 3,000 m)

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 Vrms, verified by a 5 s

dielectric withstand test

Channel-to-earth ground (up to 5,000 m)

Continuous 60 VDC, Measurement

Category I

Withstand 860 Vrms

Vsup inputs-to-earth ground (up to 5,000 m)

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 Vrms, verified by a 5 s

dielectric withstand test

Caution Any excitation output voltage to earth ground

must remain below 60 VDC for each channel. To

determine excitation output voltage to earth ground for

a channel, add the maximum excitation voltage to the

maximum potential on pin 3. The maximum excitation

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voltages are 2 V +3% and 3.3 V +3% for the bridge

excitations, 12 V +5% for the +12 V excitation, and

22 V for the IEPE excitation.

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.

Caution Do not connect the NI 9218 to signals or use

for measurements within Measurement Categories II,

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.

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Safety Guidelines for Hazardous Locations

The NI 9218 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 9218 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.

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Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9218 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 9218 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 9218

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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