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321877B-01

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 Copyright 1993, 1999 National Instruments Corp. All rights reserved.

November 1999

INSTALLATION GUIDE

SCXI -1328 H

IGH

-A

CCURACY

 I

SOTHERMAL

 

T

ERMINAL

 B

LOCK

This guide describes how to install and use the SCXI-1328 high-accuracy 
isothermal terminal block with the SCXI-1120, SCXI-1120D, and 
SCXI-1121 modules.

Introduction

The SCXI-1328 high-accuracy isothermal terminal block consists of a 
shielded board with screw terminals to connect to the SCXI module input 
connector. The SCXI-1328 has a high-precision thermistor and an 
aluminum isothermal plate to minimize the temperature gradients across 
the screw terminals when you measure thermocouples.

The terminal block has 18 screw terminals for easy connection. One pair of 
screw terminals connects to the SCXI module chassis ground. With the 
SCXI-1120/D or SCXI-1125, the remaining eight pairs of screw terminals 
are for signal connection to the eight module inputs. With the SCXI-1121, 
four pairs of screw terminals are for the four module inputs and four pairs 
are for the module excitation channels.

What You Need to Get Started

To set up and use your SCXI-1322 terminal block, you need the following 
items:

SCXI-1328 terminal block

SCXI-1328 High-Accuracy Isothermal Terminal Block Installation 
Guide

SCXI chassis

SCXI-1120, SCXI-1120D, SCXI-1125, or SCXI-1121 module

Summary of Contents for SCXI-1328

Page 1: ...put connector The SCXI 1328 has a high precision thermistor and an aluminum isothermal plate to minimize the temperature gradients across the screw terminals when you measure thermocouples The termina...

Page 2: ...so 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 programmi...

Page 3: ...up to 300 V When connecting or disconnecting signal lines to the SCXI terminal block screw terminals make sure the lines are powered off Potential differences between the lines and the SCXI ground cr...

Page 4: ...tance and returns the thermistor temperature Alternatively you can use the following formulas T C TK 273 15 where TK is the temperature in kelvin a 1 295361 10 3 b 2 343159 10 4 c 1 018703 10 7 RT res...

Page 5: ...gnal wires through the strain relief opening You can add insulation or padding if necessary 4 Prepare your signal wire by stripping the insulation no more than 12 mm 5 Connect the wires to the screw t...

Page 6: ...er Lug 4 Mating Connector 5 Thumbscrew 6 Top Cover Screws 7 Top Cover 1 Screw Terminals 2 Berg Connector W1 3 Channel Labeling for the SCXI 1120 D 4 Channel Labeling for the SCXI 1121 2 7 3 6 4 5 1 Ba...

Page 7: ...C Repeatability 0 2 from 15 to 35 C Output 1 91 to 0 58 V from 0 to 55 C Common mode isolation Channel to channel 300 Vrms Channel to ground 300 Vrms Environment Operating temperature 0 to 50 C Stora...

Page 8: ...cost are updated daily and can be found in the Technical Support section of our Web site at www ni com support Worldwide Support National Instruments has offices located around the globe Many branch...

Page 9: ...6 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 2...

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