National Instruments SCXI -1122 - Manual (Page 12)

© National Instruments Corporation 1-1 SCXI-1122 User Manual
Chapter 1
Introduction
This chapter describes the SCXI-1122; lists the contents of your SCXI-1122 kit; describes the
optional software, optional equipment, and custom cables; and explains how to unpack the
SCXI-1122.
The SCXI-1122 has 16 isolated input channels and two isolated excitation channels. The
SCXI-1122 is a module for signal conditioning of strain gauges, RTDs, thermistors,
thermocouples, volt and millivolt sources, 4 to 20 mA current sources, and 0 to 20 mA process-
current sources. The SCXI-1122 can operate in two modes–two-wire scan mode with all 16
input channels used for input, or the four-wire scan mode with the eight upper channels
configured as sense leads for connecting inputs and the lower eight channels configured as
current output channels. The SCXI-1122 inputs are multiplexed to a single output, which drives
a single DAQ board channel.
The SCXI-1122 operates with full functionality with the National Instruments MIO-16,
Lab-PC+, and the SCXI-1200 boards. You can use the Lab and PC-LPM-16 boards with the
SCXI-1122, but these boards cannot scan the module. These boards can perform only single-
channel reads. You can multiplex several SCXI-1122s into a single channel, thus greatly
increasing the number of isolated analog input signals that you can digitize.
You can add the SCXI-1322 shielded terminal block, which has screw terminals to which you
can easily attach the input signals to the SCXI-1122. In addition, the SCXI-1322 has a
temperature sensor for cold-junction compensation of thermocouples. This cold-junction
reference (CJR) is multiplexed with the 16 input channels.
What Your Kit Should Contain
The contents of the SCXI-1122 kit (part number 776572-22) are listed as follows:
Kit Component Part Number
SCXI-1122 module 182366-01
SCXI-1122 User Manual 320516-01
If your kit is missing any of the components, contact National Instruments.
Detailed specifications of the SCXI-1122 are listed in Appendix A, Specifications.