National Instruments NI 9234 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9234

4-Channel, ±5 V, 24-Bit Software-Selectable

IEPE and AC/DC Analog Input Module

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NI 9234 Operating Instructions and Specifications 2ni.com

This document describes how to use the National Instruments 9234

and includes specifications and connector assignments for the

NI 9234. Visit ni.com/info and enter rdsoftwareversion to

determine which software youneed for the modules youare using.

For information about installing, configuring, and programming

the system, refer to the system documentation. Visit ni.com/info

and enter cseriesdoc for information about C Series

documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9234. The other

components in the system might not meet the same safety

ratings and specifications. Refer to the documentation for

each component in the system to determine the safety

ratings and specifications for the entire system. Visit

ni.com/info and enter cseriesdoc for information

about C Series documentation.

Safety Guidelines

Operate the NI 9234 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

Safety Guidelines for Hazardous Locations

The NI 9234 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 youare installing the NI 9234 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.

NI 9234 Operating Instructions and Specifications 4ni.com

Caution Substitution of components may impair

suitability for Class I, Division 2.

Caution For Zone 2 applications, install the system

in an enclosure rated to at least IP 54 as defined by

IEC 60529 and EN 60529.

Caution For Zone 2 applications, connected signals must

be within the following limit:

Capacitance .......................... 0.2 μF max

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex nA IIC T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations. If youare using the NI 9234 in Gas Group IIC hazardous

locations or in ambient temperatures of –40 °C ≤Ta ≤70 °C, you

must use the device in an NI chassis that has been evaluated as

EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

Special Conditions for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for

marine applications. To verify Lloyd’s Register certification, visit

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission requirements

for marine applications, use shielded cables and install

the system in a metal enclosure. Suppression ferrites

must be installed on power supply inputs near power

entries to modules and controllers. Power supply and

module cables must be separated on opposite sides of the

enclosure and must enter and exit through opposing

enclosure walls.

NI 9234 Operating Instructions and Specifications 6ni.com

Connecting the NI 9234

The NI 9234 has four BNC connectors that provide connections to

four simultaneously sampled analog input channels.

Figure 1. NI 9234 Connector Assignments

AI3+

AI3–

AI2+

AI2–

AI0+

AI0–

AI1+

AI1–

Each channel has a BNC connector to which youcan connect

a signal source. Youcan also enable excitation current on a

per-channel basis to connect Integrated Electronics Piezoelectric

(IEPE) sensors. Refer to the NI 9234 Circuitry section for more

information. The center pin of the connector, AI+, provides the DC

excitation, when enabled, and the positive input signal connection.

The shell of the connector, AI–, provides the excitation return path

and the signal ground reference.

Connecting Signal Sources to the NI 9234

Yo ucan connect ground-referenced or floating signal sources to

the NI 9234. To avoid picking up ground noise, use a floating

connection. To further minimize ground noise, prevent the metal

shells of the BNC connectors from coming in contact with each

other, the modules, or the chassis.

If youmake a ground-referenced connection between the signal

source and the NI 9234, make sure the voltage on the AI– shell

is in the common-mode range to ensure proper operation of the

NI 9234. The AI– shell is protected against accidental contact with

overvoltages within the overvoltage protection range. Refer to the

Specifications section for more information about operating

voltages and overvoltage protection.

NI 9234 Operating Instructions and Specifications 8ni.com

Refer to Figures 2 and 3 for illustrations of connecting grounded

and floating signal sources to the NI 9234.

Figure 2. Connecting a Grounded Signal Source to the NI 9234

NI 9234

AI+

AI–

–

Signal

Source

Common

Mode

Voltage

Figure 3. Connecting a Floating Signal Source to the NI 9234

The NI 9234 can also provide an IEPE excitation current for each

channel to measure ground-referenced or floating IEPE sensors.

Typical IEPE sensors have a case that is electrically isolated from

the IEPE electronics, so connecting the sensor to the NI 9234

results in a floating connection even though the case of the sensor

is grounded.

NI 9234

AI+

AI–

–

Signal

Source

NI 9234 Operating Instructions and Specifications 10 ni.com

NI 9234 Circuitry

The NI 9234 analog input channels are referenced to chassis

ground through a 50 Ωresistor. To minimize ground noise, make

sure the chassis ground is connected to earth ground. Each channel

is protected from overvoltages. The input signal on each channel is

buffered, conditioned, and then sampled by a 24-bit Delta-Sigma

ADC. Youcan configure each channel in software for AC or DC

coupling. For channels set to AC coupling, youcan turn the IEPE

excitation current on or off. Refer to the software help for

information about configuring channels on the NI 9234.

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