National Instruments 9235 Bedienungsanleitung

GETTING STARTED GUIDE

NI 9235

8 AI, ±29.4 mV/V, 24 Bit, 10 kS/s/ch

Simultaneous, 120 Ω Quarter-Bridge Completion

This document explains how to connect to the NI 9235.

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 9235. 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 9235 only as described in this document.

Caution Do not operate the NI 9235 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 9235 Getting Started Guide

Safety Voltages

Connect only voltages that are within the following limits:

Between any two terminals ±30 V maximum

Isolation

Channel-to-channel None

Channel-to-earth ground

Continuous 60 VDC,

Measurement Catergory I

Withstand 1,000 Vrms, 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.

NI 9235 Getting Started Guide | © National Instruments | 3

Caution Do not connect the NI 9235 to signals or use

for measurements within Measurement Categories II,

III, or IV.

Safety Guidelines for Hazardous Locations

The NI 9235 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 9235 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.

4| ni.com | NI 9235 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,

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 9235 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO Certificate No. 07 ATEX 0626664X and is

IECEx UL 14.0089X certified. Each NI 9235 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 9235

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.

NI 9235 Getting Started Guide | © National Instruments | 5

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.

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

6| ni.com | NI 9235 Getting Started Guide

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.

Special Conditions for Marine Applications

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

marine (shipboard) applications. To verify Lloyd’s Register

certification for a product, visit ni.com/certification and search

for the LR certificate, or look for the Lloyd’s Register mark on

the product.

Caution 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.

NI 9235 Getting Started Guide | © National Instruments | 7

Preparing the Environment

Ensure that the environment in which you are using the NI 9235

meets the following specifications.

Operating temperature

(IEC 60068-2-1, IEC 60068-2-2)

-40 °C to 70 °C

Operating humidity

(IEC 60068-2-78)

10% RH to 90% RH,

noncondensing

Pollution Degree 2

Maximum altitude 5,000 m

Indoor use only.

Note Refer to the device datasheet on ni.com/manuals

for complete specifications.

Connecting the NI 9235

The NI 9235 provides connections for eight 120 Ω quarter-bridge

input channels.

8| ni.com | NI 9235 Getting Started Guide

Figure 1. NI 9235 Pinout

EXC1

AI1

RC1

EXC3

AI3

RC3

EXC5

AI5

RC5

EXC7

AI7

RC7

EXC0

AI0

RC0

EXC2

AI2

RC2

EXC4

AI4

RC4

EXC6

AI6

RC6

NI 9235 Getting Started Guide | © National Instruments | 9

Table 1. Signal Descriptions

Signal Description

EXC Provides the excitation voltage stimulus

AI Measures the bridge voltage

RC Provides the quarter-bridge completion

Connecting a Quarter-Bridge Sensor

You can connect quarter-bridge sensors to the NI 9235.

Figure 2. Connecting a Quarter-Bridge to One Channel

EXC

RC NI 9235

10 | ni.com | NI 9235 Getting Started Guide

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