National Instruments NI 9234 Manuale utente

NI-9234 Getting

Started

2022-07-06

Contents

Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connecting the NI 9234. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Signal Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting Floating Dierential Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting Grounded Dierential Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Common-Mode Bias Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

IEPE Excitation Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Overvoltage Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

ni.com

NI-9234 Getting Started

Before You Begin

Read the NI-9234 Safety, Environmental, and Regulatory Information and

complete the soware and hardware installation procedures in your chassis

documentation.

Safety Guidelines

Caution Observe all instructions and cautions in the user documentation.

Using the product in a manner not specified can damage the product and

compromise the built-in safety protection.

Attention Suivez toutes les instructions et respectez toutes les mises

en garde de la documentation d'utilisation. L'utilisation du produit de

toute autre façon que celle spécifiée risque de l'endommager et de

compromettre la protection de sécurité intégrée.

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

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 Gc and Ex nA IIC T4 Gc hazardous locations;

and nonhazardous locations only. Follow these guidelines if you are installing the

NI-9234 Getting Started

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 o or the area is known to be nonhazardous.

Caution Do not remove modules unless power has been switched o or

the area is known to be nonhazardous.

Caution Substitution of components may impair suitability for Class I,

Division 2, or Zone 2.

Caution The system must be installed in an enclosure certified for the

intended hazardous (classified) location, having a tool secured cover/door,

where a minimum protection of at least IP54 is provided.

Caution For Division 2 and Zone 2 applications, connected signals must

be within the following limits.

Capacitance 0.2 µF maximum

Special Conditions for Hazardous Locations Use in Europe and

Internationally

The NI-9234 has been evaluated as Ex nA IIC T4 Gc equipment under

DEMKO 07ATEX 0626664X and is IECEx UL 14.0089X certified. Each NI-9234 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-9234 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.

ni.com

NI-9234 Getting Started

Caution Transient protection shall be provided that is set at a level not

exceeding 140% of the peak rated voltage value of 85 V at the supply

terminals to the equipment.

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.

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.

NI-9234 Getting Started

Special Conditions for Marine Applications

Some products are approved for marine (shipboard) applications. To verify marine

approval certification for a product, visit ni.com/product-certifications, search by

model number, and click the appropriate link.

Notice 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.

Preparing the Environment

Ensure that the environment in which you are using the NI-9234 meets the following

specifications.

Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C

Operating humidity (IEC 60068-2-30) 10% RH to 90% RH, noncondensing

Pollution Degree 2

Maximum altitude 5,000 m

Indoor use only.

Note Refer to the NI-9234 Specifications on ni.com/manuals for

complete specifications.

Connecting the NI 9234

The NI 9234 provides connections to four simultaneously sampled analog input

channels.

ni.com

NI-9234 Getting Started

Figure 1. NI 9234 Pinout

AI3+

AI3–

AI2+

AI2–

AI0+

AI0–

AI1+

AI1–

Tip To minimize ground noise, prevent the metal shells of the BNC

connectors from coming in contact with each other, the modules, or the

chassis.

Signal Descriptions

Signal Signal Description

AI+ Provides DC excitation (when enabled) and positive input signal connection

AI- Provides excitation return path and signal ground reference

Table 1. Signal Descriptions

Connecting Floating Dierential Signals

You can connect floating dierential signals to the NI-9234.

Figure 2. Connecting Floating Dierential Signals to the NI-9234

NI 9234

AI+

AI–

–

Signal

Source

NI-9234 Getting Started

Connecting Grounded Dierential Signals

You can connect grounded dierential signals to the NI-9234.

Figure 3. Connecting Grounded Dierential Signals to the NI-9234

NI 9234

AI+

AI–

–

Signal

Source

Common

Voltage

Mode

Related concepts

■Overvoltage Protection

Common-Mode Bias Current

The NI 9234 uses common-mode bias current to bias the current-limiting diodes

when IEPE current is turned o. When the NI 9234 is using grounded signal sources,

this current causes an error that is dependent on the AI- lead impedance. This error

is approximately 50 ppm of range and 15 ppm of reading per ohm of AI- impedance.

The common-mode bias current causes an error only with grounded sources and is

not an issue with floating signal sources. For best accuracy, use low-impedance

leads when connecting grounded signal sources.

Figure 4. Measurement Error Introduced by Common-Mode Bias Current

NI 9234

AI+

AI–

–

Signal

Source

AI– Lead

Impedance

Common

Mode

Bias

Current

IEPE Excitation Current

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.com

NI-9234 Getting Started

You can enable excitation current on a per-channel basis. Refer to your soware

help for more information about excitation current.

Overvoltage Protection

The NI-9234 provides overvoltage protection for each channel.

Note Refer to the NI-9234 Specifications on ni.com/manuals for more

information about overvoltage protection.

Where to Go Next

NI Services

Visit ni.com/support to find support resources including documentation,

downloads, and troubleshooting and application development self-help such as

tutorials and examples.

Visit ni.com/services to learn about NI service oerings such as calibration options,

repair, and replacement.

Visit ni.com/register to register your NI product. Product registration facilitates

technical support and ensures that you receive important information updates from

NI.

NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX,

78759-3504, USA.

NI-9234 Getting Started

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