CVI ™, LabVIEW ™, NI-DAQ ™, and SCXI ™ are trademarks of National Instruments Corporation. Product and company names are trademarks or
trade names of their respective companies.
321923A-01
©
Copyright 1998 National Instruments Corp. All rights reserved.
August 1998
INSTALLATION GUIDE
SCXI-1303 32-C
HANNEL
I
SOTHERMAL
T
ERMINAL
B
LOCK
This guide describes how to install and use the SCXI-1303 terminal block
with SCXI-1102,SCXI-1102B, SCXI-1102C, and SCXI-1100 modules.
Introduction
The SCXI-1303 32-channel isothermal terminal block is a shielded board
with screw terminals that connect to the SCXI-1102/B/C and the
SCXI-1100 modules. The SCXI-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
measure with thermocouples.
The terminal block has 78 screw terminals for easy connection. Thirty-two
pairs of screw terminals connect to the 32 differential inputs of the SCXI
modules. One pair of terminals connects to the module’s chassis ground
pins. Three terminals connect to the SCXI module OUTPUT and AOREF
pins and to the SCXIbus guard. All of the other terminals—OUT0+,
OUT0–, OUT1+, OUT1–, OUT2+, OUT2–, OUT3+, OUT3–, and
AIREF—are reserved for future use.
The terminal block has a pullup resistor connected between CH+ and +5 V
and a bias resistor connected between CH– and chassis ground. These
resistors help you detect open thermocouples by detecting saturation of the
module amplifier output.
What You Need to Get Started
To set up and use your SCXI-1303, you will need the following items:
❑
SCXI-1303 32-channel isothermal terminal block
❑
SCXI-1303 32-Channel Isothermal Terminal Block Installation Guide
Summary of Contents for SCXI-1303
Page 11: ......
