National Instruments NI 9233 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9233

4-Channel, ±5 V, 24-Bit IEPE Analog Input Module

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NI 9233 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9233

and includes specifications and connector assignments for the

NI 9233. 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 9233. 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 9233 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 9233 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and

Ex nC IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9233 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 9233 Operating Instructions and Specifications 4 ni.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 EEx nC IIC T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. Each module

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

locations. If youare using the NI 9233 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 9233 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9233

The NI 9233 has four BNC connectors that provide connections for

four simultaneously sampled analog input channels.

Figure 1. NI 9233 Connector Assignments

AI3+

AI3–

AI2+

AI2–

AI0+

AI0–

AI1+

AI1–

Each channel has a BNC connector to which youcan connect an

Integrated Electronic Piezoelectric (IEPE) sensor. The center pin

of the connector, AI+, provides the DC excitation and the AC

signal connection. The shell of the connector, AI–, provides the

excitation return path and the AC signal ground reference.

Yo ucan connect ground-referenced or floating IEPE sensors to the

NI 9233. Youcan avoid picking up ground noise by using a floating

connection. Typical IEPE sensors have a case that is electrically

isolated from the IEPE electronics, so connecting the sensor to the

NI 9233 results in a floating connection even though the case of the

sensor is grounded. To further minimize ground noise, prevent

the metal shells of the BNC connectors from touching each other,

the modules, or the chassis.

If youmake a ground-referenced connection between the IEPE

sensor and the NI 9233, make sure the voltage on the AI– shell

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

NI 9233. 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. Figures 2 and 3 illustrate

connecting grounded and floating IEPE sensors to the NI 9233.

NI 9233 Operating Instructions and Specifications 8 ni.com

Figure 2. Connecting a Grounded IEPE Sensor to the NI 9233

Figure 3. Connecting a Floating IEPE Sensor to the NI 9233

NI 9233

IEPE Sensor

AI+

AI–

–

NI 9233

–

AI–

AI+

IEPE Sensor

The NI 9233 analog input channels are referenced to the chassis

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

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

channel is protected from overvoltages. The NI 9233 provides

an IEPE excitation current for each input signal. The signal is

AC-coupled, buffered, and conditioned. The signal is then sampled

by a 24-bit Delta-Sigma ADC. The NI 9233 IEPE excitation

current and AC coupling are always enabled. Refer to Figure 4 for

an illustration of the input circuitry for one channel of the NI 9233.

Figure 4. Input Circuitry for One Channel of the NI 9233

NI 9233

AI+

AI–

50 Ω

ADC

Amplifier

and

Prefilter

Excitation

Current

Coupling

NI 9233 Operating Instructions and Specifications 10 ni.com

The NI 9233 also has TEDS circuitry. For more information about

TEDS, visit ni.com/info and enter rdteds.

Understanding NI 9233 Filtering

The NI 9233 uses a combination of analog and digital filtering

to provide an accurate representation of in-band signals while

rejecting out-of-band signals. The filters discriminate between

signals based on the frequency range, or bandwidth, of the signal.

The three important bandwidths to consider are the passband, the

stopband, and the alias-free bandwidth.

The NI 9233 represents signals within the passband, as quantified

primarily by passband flatness and phase nonlinearity. All signals

that appear in the alias-free bandwidth are either unaliased signals

or signals that have been filtered by at least the amount of the

stopband rejection.

Passband

The signals within the passband have frequency-dependent gain or

attenuation. The small amount of variation in gain with respect to

frequency is called the passband flatness. The digital filters of the

NI 9233 adjust the frequency range of the passband to match the

data rate. Therefore, the amount of gain or attenuation at a given

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