National Instruments SCXI Series - Page 5

Contents
SCXI-1120/D User Manual vi www.natinst.com
Rear Connector Signal Descriptions .............................................................................3-9
Analog Output Signal Connections.................................................................3-10
Chapter 4
Theory of Operation
Functional Overview ..................................................................................................... 4-1
Power-Up State ...............................................................................................4-2
SCXIbus Connector and Digital Interface.....................................................................4-3
Digital Control Circuitry ............................................................................................... 4-4
Analog and Timing Circuitry ........................................................................................ 4-5
Analog Input Channels....................................................................................4-6
Analog Output Circuitry................................................................... 4-9
Chapter 5
Calibration
Calibration Equipment Requirements ...........................................................................5-1
Offset Null Adjust ......................................................................................................... 5-1
Appendix A
Specifications
Appendix B
Technical Support Resources
Glossary
Index
Figures
Figure 1-1. The Relationship between the Programming Environment,
NI-DAQ, and Your Hardware............................................................... 1-5
Figure 2-1. SCXI-1120/D Parts Locator Diagram...................................................2-2
Figure 2-2. Removing the SCXI Module Cover......................................................2-4
Figure 3-1. SCXI-1120/D Front Connector Pin Assignments.................................3-3
Figure 3-2. Ground-Referenced Signal Connection for the SCXI-1120/D
with High Common-Mode Voltage ...................................................... 3-5
Figure 3-3. Floating Signal Connection for the SCXI-1120/D Referenced to
Chassis Ground for Better Signal-to-Noise Ratio................................. 3-5