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 are trademarks of National Instruments Corporation. Product and company names mentioned 

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322715A-01

© Copyright 2000 National Instruments Corp. All rights reserved.

May 2000

INSTALLATION GUIDE

SCXI

-1300/1301 T

ERMINAL

B

LOCK

This guide describes how to install and use the SCXI-1300 and SCXI-1301 
terminal block with your SCXI module.

Introduction

The following sections describe the SCXI-1300/1301 terminal blocks and 
their associated screw terminals.

SCXI-1300

Using the SCXI-1300 terminal block with 32-channel SCXI modules, you 
can conveniently connect signals through screw terminals. Your terminal 
block has the following features:

Seventy-two screw terminals

A cold-junction temperature sensor

Thirty-two pairs of screw terminals that connect to the 32 differential 
inputs of the SCXI module

Two screw terminals that connect to the module functional chassis 
ground pins

A solder lug available as a safety chassis ground

Additional screw terminals connect to the SCXI module OUTPUT, 
the SCXI module AOREF, and to the SCXIbus GUARD

SCXI-1301

Using the SCXI-1301 terminal block, which has 20 screw terminals, you 
can conveniently connect signals to the SCXI-1140 module. Your terminal 
block has the following features:

Eight pairs of screw terminals connect to the eight differential inputs 
of the SCXI-1140 module

Two screw terminals that connect to the AGND of the module

Additional screw terminals that connect to the HOLD signal and 
functional chassis ground

Summary of Contents for SCXI-1300

Page 1: ... terminals Your terminal block has the following features Seventy two screw terminals A cold junction temperature sensor Thirty two pairs of screw terminals that connect to the 32 differential inputs of the SCXI module Two screw terminals that connect to the module functional chassis ground pins A solder lug available as a safety chassis ground Additional screw terminals connect to the SCXI module...

Page 2: ...1 terminal block you need the following items SCXI 1300 or SCXI 1301 terminal block SCXI 1300 1301 Terminal Block Installation Guide SCXI chassis SCXI module Your SCXI module user manual Number 1 and 2 Phillips head screwdrivers 1 8 in flathead screwdriver Long nose pliers Wire cutter Wire insulation stripper ...

Page 3: ...ning You can add insulation or padding if necessary 4 Prepare your signal wire by stripping the insulation to no more than 7 mm 5 Connect the signal wires to the screw terminals by inserting the stripped end of the wire fully into the terminals and tighten the screws with a flathead screwdriver Tighten the screws to a torque of 5 to 7 in lb Caution Uninsulated wire extending past the screw termina...

Page 4: ...e strain relief screws 7 Reinstall the top cover and tighten the top cover screws When connecting signals to the SCXI 1300 terminal block follow the labeling on the SCXI 1300 terminal block as indicated in Figure 2 Figure 2 SCXI 1300 Signal Connections 1 Screw Terminals 2 Mating Connector 2 1 ...

Page 5: ...al block follow the labeling on the SCXI 1301 terminal block as indicated in Figure 3 Figure 3 SCXI 1301 Signal Connections You are ready to connect the terminal block to the module front connector as explained in the Connecting the Terminal Block to the SCXI Module section 1 Screw Terminals 2 Mating Connector 1 2 ...

Page 6: ...lt parking position If you are using a non referenced floating thermocouple the SCXI 1100 instrumentation amplifier can be driven into saturation if the thermocouple is not grounded properly Choose one of the following two options to ground the thermocouple Ground the negative lead of the thermocouple near the thermocouple junction Leave jumper W1 on the SCXI 1100 in the factory default parking po...

Page 7: ... National Instruments Corporation 7 SCXI 1300 1301 Terminal Block Figure 4 Connecting a Thermocouple to SCXI 1300 Channel 0 1 Channel 0 2 Chassis Ground 3 Thermocouple 3 1 2 ...

Page 8: ...r application software does not provide voltage to temperature conversion for the cold junction reference CJR of the SCXI 1300 you can determine the CJR temperature using the following formulas where VTEMPOUT is the temperature sensor output voltage and T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively Note Average a large number of samples to obtain t...

Page 9: ...nit must be completely dry and free from contanimants before returning to service Specifications All specifications are typical at 25 C unless otherwise specified Electrical Cold Junction Sensor on the SCXI 1300 Sensor type Integrated circuit LM35CAZ Accuracy1 1 3 C from 0 to 50 C Repeatability 0 5 C Output 0 to 0 5 V from 0 to 50 C 10 mV C Environment Operating temperature 0 to 50 C Storage tempe...

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