National Instruments NI 9239 Manual de usuario

NI-9239

GETTING STARTED GUIDE

NI 9239

4 AI, ±10 V, 24 Bit, 50 kS/s/ch Simultaneous

This document explains how to connect to the NI 9239.

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 9239. 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 9239 only as described in this document.

Caution Do not operate the NI 9239 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

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

repair.

2| ni.com | NI 9239 Getting Started Guide

Hazardous Voltage This icon denotes a warning

advising you to take precautions to avoid electrical

shock with the NI 9239 with screw terminal.

NI 9239 with Screw Terminal Safety Voltages

Connect only voltages that are within the following limits:

Isolation

Channel-to-channel

Continuous 250 Vrms, Measurement

Category II

Withstand 1,390 V, verified by a 5 s

dielectric withstand test

Channel-to-earth ground

Continuous 250 Vrms, Measurement

Category II

Withstand 2,300 V, verified by a 5 s

dielectric withstand test

NI 9239 Getting Started Guide | © National Instruments | 3

Division 2 and Zone 2

hazardous locations

applications1

60 VDC, Measurement

Category I

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.

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 If using in Division 2 or Zone 2 hazardous

locations applications, do not connect the NI 9239 with

1Channel-to-channel and channel-to-earth ground

4| ni.com | NI 9239 Getting Started Guide

screw terminal to signals or use for measurements

within Measurement Categories II, III, or IV.

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

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 9239 with screw

terminal to signals or use for measurements within

Measurement Categories III or IV.

NI 9239 with BNC Safety Voltages

Connect only voltages that are within the following limits:

Isolation

Channel-to-channel

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 V, verified by a 5 s

dielectric withstand test

NI 9239 Getting Started Guide | © National Instruments | 5

Channel-to-earth ground

Continuous 60 VDC, Measurement

Category I

Withstand 1,000 V, 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

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.

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.

6| ni.com | NI 9239 Getting Started Guide

Caution Do not connect the NI 9239 with BNC to

signals or use for measurements within Measurement

Categories II, III, or IV.

Safety Guidelines for Hazardous Voltages

You can connect hazardous voltages only to the

NI 9239 with screw terminal. Do not connect hazardous voltages

to the NI 9239 with BNC.

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.

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

NI 9239 Getting Started Guide | © National Instruments | 7

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.

Safety Guidelines for Hazardous Locations

The NI 9239 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 9239 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.

8| ni.com | NI 9239 Getting Started Guide

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 Division 2 and Zone 2 applications,

install a protection device between the input signal and

the input terminal. The device must clamp all voltage

sources to no more than 40% above their rated value or

within 84 VDC to earth ground if there is a transient

overvoltage condition.

Caution For Division 2 and Zone 2 applications,

connected voltage sources must be within 60 VDC to

earth ground.

Caution For Division 2 and Zone 2 applications,

connected signals must be within the following limits.

Capacitance 0.01 μF max

Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9239 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO Certificate No. 07 ATEX 0626664X and is

NI 9239 Getting Started Guide | © National Instruments | 9

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