National Instruments TBX-1303 User Manual

National Instruments TBX-1303 Manual

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TBX-1303 32-C

HANNELISOTHERMAL

T

ERMINAL

B

LOCKINSTALLATION

This guide describes how to install the National Instruments TBX-1303
32-channel isothermal terminal block and how to use it with SCXI-1100
and SCXI-1102/B/C modules.

The TBX-1303 is a DIN rail-mountable terminal block that connects
through a cable to the SCXI-1100 or SCXI-1102/B/C module input
connector. The TBX-1303 has a high-accuracy thermistor, cold-junction
temperature sensor, and an isothermal copper plane to minimize the
temperature gradients across the screw terminals when you take
measurements with thermocouples. The TBX-1303 mounts on most
European standard DIN EN mounting rails.

The TBX-1303 has 108 screw terminals. Thirty-two sets of three screw
terminals connect to the 32 differential inputs of the SCXI module and
shield each input. One pair of terminals labeled GND connects to the
chassis ground pins of the SCXI module. All the other terminals—AIREF,
AOREF, GUARD, OUT0+, OUT0–, OUT1+, OUT1–, OUTPUT,and
their shields—are reserved for future use.

G

UIDE

National Instruments™, NI™, ni.com™, and SCXI™ are trademarks of National Instruments Corporation. Product and
company names mentioned herein are trademarks or trade names of their respective companies. For patents covering
National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file
on your CD, or ni.com/patents.

ni.com

© 1996–2002 National Instruments Corp. All rights reserved.

June 2002

371205A-01

Conventions

The following conventions are used in this guide:

<> Angle brackets that contain numbers separated by an ellipsis represent

a range of values associated with a bit or signal name—for example,
DBIO<3..0>. Angle brackets can also denote a variable in a channel
name—for example, ACH<i>.

» 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.

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 and hardware labels.

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.

What You Need to Get Started

To install and use the TBX-1303, you need the following items:

❑

TBX-1303 32-channel isothermal terminal block kit

– TBX-1303 32-channel isothermal terminal block

– TBX-1303 32-Channel Isothermal Terminal Block Installation

Guide

– Four 10 MΩ resistor networks

TBX-1303 32-Channel Isothermal Terminal Block 2 ni.com

– 1/8 in. flathead screwdriver

Read Me First: Safety and Radio-Frequency Interference

❑

❑

SCXI chassis and documentation

❑

One of the following modules:

– SCXI-1100 module and documentation

– SCXI-1102/B/C module and documentation

❑

One of the following cable assemblies:

– SH96-96

– R9696

– SBS-96F shielded backshell

❑

Long-nose pliers

❑

3/16 in. wrench

❑

Number 1 Phillips screwdriver

❑

TBX rack-mount kit (optional)

– TBX rack-mount assembly

– TBX Rack-Mount Kit Installation Guide

– Four 10-32 screws

© National Instruments Corporation 3 TBX-1303 32-Channel Isothermal Terminal Block

Installing the TBX-1303

Perform the following steps to mount the SH96-96 cable assembly and
connect the TBX-1303 to the SCXI module. Refer to Figures 1 and 2
as needed.

Caution

Refer to the Connecting Signals section before connecting the signals. If signal
wires are connected to the terminal block, dangerous voltages can exist even when the
equipment is powered off.

1. Power off the SCXI chassis.

2. Power off the computer that contains the E Series data acquisition
(DAQ) device, or disconnect the device from the SCXI chassis.

3. Connect the TBX cable adapter to the SCXI module, and secure
the adapter by tightening both thumbscrews.

4

3

1

2

1

3

1 Backshell Mounting Screws
2 SH96-96 Cable

5

3 Thumbscrews
4 SCXI Chassis

Figure 1. Connecting the SH96-96 Cable to the SCXI Module

5 TBX Cable Adapter

TBX-1303 32-Channel Isothermal Terminal Block 4 ni.com

4. Connect either end of the SH96-96 cable to the TBX cable adapter
and SCXI module, and secure the cable by tightening both backshell
mounting screws.

5. Connect the other end of the cable to the TBX-1303 terminal block
connector, and secure the cable by tightening both backshell mounting
screws.

Note

To minimize the temperature gradient inside the terminal block and to maintain its
isothermal properties for accurate cold-junction compensation (CJC), keep the TBX-1303
terminal block away from extreme temperature differentials.

3

5

4

1

3

1 Backshell Mounting Screws
2 Shield Grounding Lugs

Note

The SH96-96 cable is not shown in the exact position for proper connection to the

Figure 2.

2

1

3 Captive Cover Screws
4 Terminal Block Connector

5 Signal Wire Entry

Connecting the SH96-96 Cable to the TBX-1303 Terminal Block

terminal block connector. Refer to Figure 3 for the completed installation.

© National Instruments Corporation 5 TBX-1303 32-Channel Isothermal Terminal Block