National Instruments NI 785xR - Manual (Page 6)

Contents
R Series Intelligent DAQ User Manual vi ni.com
Types of Signal Sources ................................................................................................ 2-8
Floating Signal Sources .................................................................................. 2-8
Ground-Referenced Signal Sources ................................................................ 2-8
Input Modes................................................................................................................... 2-8
Differential Connection Considerations (DIFF Input Mode) ......................... 2-10
Differential Connections for Ground-Referenced Signal Sources ... 2-11
Differential Connections for Nonreferenced or
Floating Signal Sources ................................................................. 2-12
Single-Ended Connection Considerations ...................................................... 2-13
Single-Ended Connections for Floating Signal Sources
(RSE Input Mode).......................................................................... 2-14
Single-Ended Connections for Grounded Signal Sources
(NRSE Input Mode)....................................................................... 2-15
Common-Mode Signal Rejection Considerations........................................... 2-16
Analog Output ............................................................................................................... 2-16
Connecting Analog Output Signals ............................................................................... 2-17
Digital I/O...................................................................................................................... 2-17
Connecting Digital I/O Signals ..................................................................................... 2-17
RTSI Trigger Bus .......................................................................................................... 2-21
PXI Local Bus (NI PXI-781xR/783xR Only) ............................................................... 2-21
Switch Settings (NI 781xR/783xR Only)...................................................................... 2-23
+5 V Power Source........................................................................................................ 2-28
Device Fuse Replacement (NI 784xR/785xR Only) ...................................... 2-29
Field Wiring Considerations (NI 783xR/784xR/785xR Only) ..................................... 2-31
Chapter 3
Calibration (NI 783xR/784xR/785xR Only)
Loading Calibration Constants ...................................................................................... 3-1
Internal Calibration........................................................................................................ 3-1
External Calibration....................................................................................................... 3-2
Appendix A
Connecting I/O Signals
Appendix B
Using the SCB-68 Shielded Connector Block
Appendix C
Technical Support and Professional Services
Glossary