National Instruments TC-2190 Manuel utilisateur

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October 2002

321674C-01

TC-2190 ADAPTER WITH THERMOCOUPLE

MINICONNECTORS INSTALLATION GUIDE

This installation guide describes how to install and connect thermocouples

and digital I/O signals to the TC-2190 adapter with thermocouple

miniconnectors to use with the NI USB-4350, NI PXI-4351, and

NI PCI-4351 data acquisition (DAQ) devices.

Introduction

The TC-2190 adapter consists of a shielded box with 14 miniconnectors

that you can use to connect the thermocouples to the NI 435Xfor USB,

PXI, and PCI. This adapter has two 68-pin connectors—one on the front

and one on the rear. You can use either of the two connectors to connect the

TC-2190 to the NI 435Xusing an SH6868 shielded cable (recommended)

or an R6868 ribbon cable. You can also access the eight digital I/O lines

and the digital ground of the NI 435Xusing the spring terminal blocks.

This adapter is designed specifically for ease of use with thermocouples.

It features isothermal construction to minimize the temperature gradients

across the thermocouple junctions and a high-accuracy thermistor

cold-junction temperature sensor.

The TC-2190 connects to all the digital I/O lines on the NI 435Xand all but

two analog input channels (CH)—CH0 is dedicated to the cold-junction

sensor and CH1 is dedicated to auto-zeroing circuitry. Refer to the

NI 435X User Manual for further details on the cold-junction sensor and

auto-zeroing circuitry.

Conventions

The following conventions are used in this guide:

»The »symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to

pull down the File menu, select the Page Setup item, and select Options

from the last dialog box.

ni.com

TC-2190 Adapter Installation Guide 2 ni.com

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash. When this symbol is marked on

the product, refer to the Read Me First: Safety and Radio-Frequency

Interference document, shipped with the product, for precautions to take.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter

names.

italic Italic text denotes variables, emphasis, a cross reference, or an introduction

to a key concept. This font also denotes text that is a placeholder for a word

or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.

This font is also used for the proper names of disk drives, paths, directories,

programs, subprograms, subroutines, device names, functions, operations,

variables, filenames and extensions, and code excerpts.

NI 435XRefers to all devices in the National Instruments 4350 and 4351 families.

What You Need to Get Started

You need the following items to set up and use the TC-2190:

❑TC-2190 adapter with thermocouple miniconnectors

❑TC-2190 Adapter with Thermocouple Miniconnectors Installation

Guide

❑Read Me First: Safety and Radio-Frequency Interference

❑NI PCI-4351, NI PXI-4351, or NI USB-4350 and documentation

❑One of the following cable assemblies:

– SH6868 shielded cable (recommended)

– R6868 ribbon cable

❑1/8 in. flathead screwdriver

❑Number 1 Phillips screwdriver

❑Wire cutters

©National Instruments Corporation 3 TC-2190 Adapter Installation Guide

❑Wire insulation strippers

❑Four adhesive rubber feet

Configuring the Shield Ground Jumpers

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Jumper W1, located inside the TC-2190 on the bottom of the board,

connects the shield of the 68-pin connectors and the TC-2190 metal case to

NI 435Xground through a 100 Ωresistor (default setting) or directly to

NI 435Xground, or keeps the metal case and NI 435Xground separate.

Table 1 shows the configuration options for jumper W1.

Note Use the default setting for jumper W1 unless you notice degraded noise

performance.

TC-2190 Adapter Installation Guide 4 ni.com

If you need to change jumper W1, refer to Figure 1 as you complete the

following steps:

1. Using the Number 1 Phillips screwdriver, remove the four countersunk

front panel screws.

2. Remove the two rear panel screws that hold the rear 68-pin connector.

3. Hold the front panel and slide the assembly out of the metal case.

4. Set jumper W1 as needed.

5. Reassemble the TC-2190, following this procedure in reverse order.

Do not overtighten the screws.

Table 1. TC-2190 Jumper Configuration Options

Jumper W1

Configuration Description When to Use This Configuration

100 Ω(factory default)—This

setting connects the TC-2190

metal chassis to NI 435X

ground through a 100 Ω

resistor, while keeping any

potential ground loop current

very small.

Use this setting when you are using

the SH6868 cable, and:

• You have not rack-mounted the

TC-2190, or

• You have mounted the TC-2190 on

a rack, but are unsure whether the

rack and the TC-2190 are

grounded.

0 Ω—This setting connects

the TC-2190 metal chassis to

NI 435Xground.

Use this setting when you are using

the R6868 cable, and:

• You have not rack-mounted the

TC-2190, or

• You have mounted the TC-2190 on

a rack and are sure that the rack and

the TC-2190 are not grounded.

Open—This setting

disconnects the TC-2190

metal chassis from NI 435X

ground.

Use this setting when you are using

either the SH6868 cable or the

R6868 cable, and:

• You have mounted the TC-2190 on

a rack, and

• You are sure that the rack and the

TC-2190 are grounded.

OPEN

100 Ω

0 Ω

OPEN

100 Ω

0 Ω

OPEN

100 Ω

0 Ω

©National Instruments Corporation 5 TC-2190 Adapter Installation Guide

Figure 1. TC-2190 Parts Locator Diagram

Connecting the Signals

Refer to the NI 435X User Manual for examples on how to connect to the

signals.

Connecting Thermocouples

Insert the thermocouple miniconnector to the mating miniconnector on the

TC-2190. Each miniconnector is keyed; that is, it has two spades of

different widths so that you can insert the thermocouple in only one way.

Do not force the miniconnector. If you encounter difficulty while inserting

the miniconnector, check whether the polarity is correct.

1 Rear Panel Screws

2 Jumper W1

3 Countersunk Front Panel Screws

4 Sprint Terminal Blocks

5 Front 68-Pin Connector

6 Thermocouple Miniconnectors

7 Rear 68-Pin Connector

76543210

DIO

TC-2190 Adapter Installation Guide 6 ni.com

Connecting Digital I/O Signals

Refer to Figure 1 as you complete the following steps to connect the digital

signals to the TC-2190:

1. Use a wire cutter and wire insulation stripper to strip the wire ends

as necessary to connect them to terminal blocks. You can use up to

20 AWG wire for connecting signals.

2. Push the spring below the DIO terminal block with a 1/8 in. flathead

screwdriver to open the terminal block clasp. Keep the spring pressed

through step 3.

3. Insert the stripped wires into the terminal blocks.

4. Release the spring.

The wire should be firmly connected.

Connecting the TC-2190 to the NI 435X

Before installing the TC-2190, make sure you have set jumper W1

correctly for the application.

You can mount the TC-2190 into a 19 in. rack or place it on a workbench

near the NI 435X. If you do not rack-mount the TC-2190, attach the four

adhesive rubber feet included in this kit to the TC-2190 to keep it stationary.

Note To minimize the temperature gradient inside the terminal block and thus maintain its

isothermal nature for accurate cold-junction compensation, place the accessory away from

extreme temperature differentials.

Refer to Figure 2 as you complete the following steps to connect the

TC-2190 to the NI 435X:

1. Connect one end of the SH6868 or R6868 cable to the TC-2190

connector on either the front or the back, as desired. The two

connectors should snap together.

2. Attach the connector on the other end of the SH6868 or R6868 cable

to the NI 435XI/O connector.

To disconnect the cable from the TC-2190, push the two ejector ears on the

cable backshell and gently pull on the backshell. The cable should pop out.

Do not pull the cable.

Caution The connectors of both the TC-2190 and the NI 435Xare keyed. Do not force the

cable. If you encounter difficulty, check whether the polarity is correct.

©National Instruments Corporation 7 TC-2190 Adapter Installation Guide

Figure 2. Connecting the TC-2190 to the NI 435X

1 TC-2190

2 Front Panel

3 Front 68-Pin Connector

4EjectorEars

5 SH6868 Shielded Cable

6 NI 435Xfor USB, PXI, and PCI

7 Rear Panel

8 Rear 68-Pin Connector

Rear View

Front View

TC-2190 Adapter Installation Guide 8 ni.com

Cold-Junction Temperature Sensor

The TC-2190 cold-junction temperature sensor consists of a precision

thermistor excited by the 25 µA current source on the NI 435X. At 25 °C,

the resistance of the thermistor is 5,000 Ω. The thermistor resistance varies

from 16,305 to 1,492 Ωover the 0 to 55 °C temperature range. The

corresponding sensor output voltage varies from 408 to 37 mV over this

temperature range.

To select and measure the temperature sensor, refer to the data acquisition

software documentation for programming information.

Alternatively, you can use the following formulas to convert the

cold-junction sensor voltage to cold-junction temperature:

T(°C) = TK– 273.15

where TKis the temperature in Kelvin.

a = 1.295361 × 10–3

b = 2.343159 × 10–4

c = 1.018703 × 10–7

RT= resistance of the thermistor in ohms

where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit

and degrees Celsius, respectively.

Note When you have configured the NI 435XDAQ device with the correct accessory in

Measurement & Automation Explorer, NI-DAQ can automatically perform cold-junction

compensation on measurements taken on thermocouple channels.

abln RT

•cln RT

()

•++

-----------------------------------------------------------------=

T°F() T°C()9•

------------------------32+=

©National Instruments Corporation 9 TC-2190 Adapter Installation Guide

Specifications

Cold-junction sensor accuracy1.............. 0.06 °C from 15 to 35 °C;

0.2 °C from 0 to 15 °C

and35to55°C

Maximum working voltage2

(signal + common mode) ....................... Each input should remain

within ±42 V of ground

Safety

The TC-2190 meets the requirements of the following standards for safety

and electrical equipment for measurement, control, and laboratory use:

• EN 61010-1, IEC 61010-1

• UL 3121-1

• CAN/CSA C22.2 No. 1010.1

Note For UL and other safety certifications refer to the product label or to ni.com.

Electromagnetic Compatibility

CE, C-Tick, and FCC Part 15 (Class A) Compliant

Electromagnetic emissions..................... EN 55011, ISM Group I,

Class A at 10 m

FCC Part 15A above 1 GHz

Electromagnetic immunity..................... Evaluated to EN 61326-1;

A1:1998, Table 1

Note For full EMC compliance, you must operate this device with shielded cabling. In

addition, all covers and filler panels must be installed. Refer to the Read Me First: Safety

and Radio-Frequency Interference document for FCC Regulatory statements and related

information.

1Includes only the thermistor accuracy. The combined effects of the temperature sensor accuracy, as well as the current source

accuracy due to tolerances in all components in the NI 435X, the effects caused by temperature and loading, and self-heating

andcurrentleakagearediscussedintheNI 435X User Manual.

2Refer to the NI 435Xmaximum working voltage specification in Appendix A, Specifications,oftheNI 435X User Manual;

use the lower number of the two.

TC-2190 Adapter Installation Guide 10 ni.com

CE Compliance

The TC-2190 meets the following amended essential requirements of

applicable European Directives for CE marking:

•Low-Voltage Directive (safety): 73/23/EEC

•Electromagnetic Compatibility Directive (EMC): 89/336/EEC

Note Refer to the Declaration of Conformity (DoC) for this product for any additional

regulatory compliance information. To obtain the DoC for this product, click Declaration

of Conformity at ni.com/hardref.nsf/. This Web site lists the DoCs by product

family. Select the appropriate product family, followed by the product, and a link appears

to the DoC in Adobe Acrobat format. Click the Acrobat icon to download or read the DoC.

Technical Support Resources

NI Web Support

NI Web support is your first stop for help in solving installation,

configuration, and application problems and questions. Online

problem-solving and diagnostic resources include frequently asked

questions, knowledge bases, product-specific troubleshooting wizards,

manuals, drivers, software updates, and more. Web support is available

through the Technical Support section of ni.com.

Worldwide Support

National Instruments has offices located around the world to help address

your support needs. You can access our branch office Web sites from the

Worldwide Offices section of ni.com. Branch office Web sites provide

up-to-date contact information, support phone numbers, email addresses,

and current events.

If you have searched the technical support resources on our Web site

and still cannot find the answers you need, contact your local office or

National Instruments corporate. For telephone support in the United States,

dial 512 795 8248. For telephone support outside the United States, contact

your local branch office:

Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20,

Brazil 55 11 3262 3599, Canada (Calgary) 403 274 9391,

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