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©
National Instruments Corporation
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About This Manual
This manual describes the electrical and mechanical aspects of the
SCXI-1121 and contains information concerning its operation and
programming. The SCXI-1121 is a member of the National Instruments
Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the
National Instruments data acquisition plug-in boards. This board is
designed for signal conditioning of strain gauges, RTDs, thermistors,
thermocouples, volt and millivolt sources, and 4 to 20 mA sources or 0 to
20 mA process-current sources where high common-mode voltages exist.
The SCXI-1121 operates as four isolated input channels and four isolated
excitation channels. Each channel is isolated and independently
configurable via jumpers.
This manual describes the installation, basic programming considerations,
and theory of operation for the SCXI-1121.
Conventions
The following conventions appear in this manual:
<>
Angle brackets that contain numbers separated by an ellipsis represent
a range of values associated with a bit or signal name—for example,
AO <3..0>.
»
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 a
product, refer to the
Read Me First: Safety and Electromagnetic
Compatibility
for information about 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.