National Instruments 321906B-01 user manual Contents

© National Instruments Corporation vii NI 2501/2503 User Manual
Contents
Chapter 1
Routing Signals with Your NI 2501/2503
About the NI 2501/2503................................................................................................ 1-1
Analog Bus......................................................................................................1-2
Triggers............................................................................................................1-2
Cold-Junction Sensor Channel........................................................................1-3
NI2 501 Amplifier...........................................................................................1-3
Connecting Signals........................................................................................................1-4
Front Connector...............................................................................................1-4
Contact Protection..........................................................................................................1-10
Terminal Blocks.............................................................................................................1-10
Software Choices...........................................................................................................1-10
NI-SWITCH Driver Software.........................................................................1-10
National Instruments Application Software....................................................1-11
Third Party Software.......................................................................................1-11
Chapter 2
NI 2501/2503 Operation
Functional Overview......................................................................................................2-1
Multiplexer.....................................................................................................................2-4
Two-Wire Mode..............................................................................................2-4
One-Wire Mode...............................................................................................2-4
Four-Wire Mode..............................................................................................2-5
Matrix Mode....................................................................................................2-5
Switch Control Circuitry................................................................................................2-5
Random Scanning..........................................................................................................2-5
PXI Interface..................................................................................................................2-6
Triggers............................................................................................................2-6
External Trigger Input.......................................................................2-6
Scanner Advanced.............................................................................2-7
Modes................................................................................................2-7
Initiating Scanning...........................................................................................2-8
Multicard Triggering.......................................................................................2-8
Appendix A
Specifications