Page 3 - Important Information
Important Information Warranty The NI 2501 and NI 2503 are warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to ...
Page 4 - Compliance
Compliance FCC/DOC Radio Frequency Interference Class A Compliance This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the instructions in this manual, may cause interference to radio and television reception. Classification requirements ...
Page 5 - Conventions
Conventions The following conventions are used in this manual. < > Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a port, bit, or signal name (for example, CH<0..7> stands for the signals CH0 through CH7). This icon to the left of b...
Page 6 - Contents
© National Instruments Corporation vii NI 2501/2503 User Manual Contents Chapter 1Routing Signals with Your NI 2501/2503 About the NI 2501/2503 ................................................................................................ 1-1 Analog Bus ...............................................
Page 7 - Glossary
Contents NI 2501/2503 User Manual viii © National Instruments Corporation Appendix BAccessories Appendix CCustomizing Your Card Appendix DArchitecture Drawings Appendix ECommon Questions Appendix FCustomer Communication Glossary Index Figures Figure 1-1. Front Connector Pinout Assignments for Two-Wi...
Page 9 - Analog Bus
Chapter 1 Routing Signals with Your NI 2501/2503 NI 2501/2503 User Manual 1-2 © National Instruments Corporation Refer to Appendix B, Accessories , for more information on terminal blocks you can order from National Instruments. You can also use multiple NI 2501/2503 cards together to expand the siz...
Page 10 - Cold-Junction Sensor Channel
Chapter 1 Routing Signals with Your NI 2501/2503 © National Instruments Corporation 1-3 NI 2501/2503 User Manual Refer to Chapter 2, NI 2501/2503 Operation , for more information on triggers. Cold-Junction Sensor Channel For low-voltage measurements, such as those provided by thermocouples, the NI 2...
Page 11 - Connecting Signals; Front Connector
Chapter 1 Routing Signals with Your NI 2501/2503 NI 2501/2503 User Manual 1-4 © National Instruments Corporation Connecting Signals This section describes the signal connections to the NI 2501/2503 module via the module front connector. This section also includes specifications and connection instru...
Page 17 - Contact Protection; Terminal Blocks; Software Choices; NI-SWITCH Driver Software
Chapter 1 Routing Signals with Your NI 2501/2503 NI 2501/2503 User Manual 1-10 © National Instruments Corporation Contact Protection Caution When inductive loads are connected to the relays, a large counter electromotive force may occur at relay switching time due to the energy stored in the inducti...
Page 18 - National Instruments Application Software
Chapter 1 Routing Signals with Your NI 2501/2503 © National Instruments Corporation 1-11 NI 2501/2503 User Manual National Instruments Application Software LabVIEW and LabWindows/CVI are innovative program development software packages for data acquisition and control applications. LabVIEW uses grap...
Page 19 - Functional Overview
© National Instruments Corporation 2-1 NI 2501/2503 User Manual 2 NI 2501/2503 Operation This chapter contains a functional overview of the NI 2501/2503 module and explains the operation of each functional unit making up the NI 2501/2503 module. Functional Overview The block diagrams on the followin...
Page 23 - Matrix Mode; Switch Control Circuitry
Chapter 2 NI 2501/2503 Operation © National Instruments Corporation 2-5 NI 2501/2503 User Manual Four-Wire Mode Four-wire mode is typically used for resistance measurements. In this mode, CHxA+, CHxA–, CHxB+, and CHxB–, are switched together to COMxA+, COMxA–, COMxB+, and COMxB–. Matrix Mode By addi...
Page 24 - PXI Interface; Triggers
Chapter 2 NI 2501/2503 Operation NI 2501/2503 User Manual 2-6 © National Instruments Corporation • Generate a scanner advanced trigger • Generate a breakpoint interrupt You can use the driver software to configure the switch card for continuous or one-time scanning. In continuous scanning, the switc...
Page 25 - Modes
Chapter 2 NI 2501/2503 Operation © National Instruments Corporation 2-7 NI 2501/2503 User Manual Routing the external trigger from the front connector to the PXI trigger lines gives you the capability to trigger multiple switch cards with only one board connected to the external trigger from the mea...
Page 26 - Initiating Scanning
Chapter 2 NI 2501/2503 Operation NI 2501/2503 User Manual 2-8 © National Instruments Corporation Initiating Scanning When you use the NI 2501/2503 to initiate a scan, make sure the measurement device is armed (waiting for trigger) before enabling scanning on the switch card. Enabling scanning causes...
Page 27 - Input Characteristics
© National Instruments Corporation A-1 NI 2501/2503 User Manual A Specifications This appendix lists the specifications for the NI 2501 and NI 2503 switch cards. These specifications are typical at 25 ° C unless otherwise noted. NI 2501 Input Characteristics Number of Channels .........................
Page 28 - Transfer Characteristics; Dynamic Characteristics
Appendix A Specifications for NI 2501 NI 2501/2503 User Manual A-2 © National Instruments Corporation Transfer Characteristics Channel Amplifier (Unity Gain) Offset Voltage (Differential) ..................1.2 mV max Cold-Junction Sensor Channel Amplifier (Unity Gain) Offset Voltage Maximum ...........
Page 29 - PXI Bus Interface; PXI Trigger Bus
Appendix A Specifications for NI 2501 © National Instruments Corporation A-3 NI 2501/2503 User Manual 0.006% Accuracy With output buffer selected ..... 30 µs Without output buffer .............. 60 µs 0.0015% Accuracy With output buffer selected ..... 80 µs Without output buffer .............. 160 µ...
Page 30 - Environment
Appendix A Specifications for NI 2501 NI 2501/2503 User Manual A-4 © National Instruments Corporation Environment Operating Temperature ........................ 0 ° to 50 ° C Storage Temperature............................ –55 ° to 150 ° C Relative Humidity...................................5% to 90...
Page 33 - Physical
Appendix A Specifications for NI 2503 © National Instruments Corporation A-7 NI 2501/2503 User Manual Physical Dimensions............................................. 10 by 16 cm (3.9 by 6.3 in.) Weight .................................................... 0.118 kg (0.4 lb.) I/O Connector ..............
Page 35 - Customizing Your Card; Current-Loop Receivers
© National Instruments Corporation C-1 NI 2501/2503 User Manual C Customizing Your Card This appendix describes options for customizing your NI 2501/2503 card. Current-Loop Receivers The NI 2501/2503 modules have sockets for transforming individual channels to current-to-voltage converters. National...
Page 37 - Architecture Drawings
© National Instruments Corporation D-1 NI 2501/2503 User Manual D Architecture Drawings This appendix contains architecture drawings for the NI 2501 and NI 2503 switch cards. The drawings show the signal names that are used when the boards are in two-wire mode. To make these drawings relevant for on...
Page 40 - Common Questions
© National Instruments Corporation E-1 NI 2501/2503 User Manual E Common Questions This appendix addresses common questions you may have while using your NI 2501 or NI 2503 switch card. How fast can I scan with the NI 2501 switch card? The NI 2501 can be scanned as fast as 250 Kscans/s. However, at ...
Page 42 - Customer Communication; Electronic Services; Bulletin Board Support
© National Instruments Corporation F-1 NI 2501/2503 User Manual F Customer Communication For your convenience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation. When you c...
Page 43 - Telephone and Fax Support; Country
NI 2501/2503 User Manual F-2 © National Instruments Corporation Fax-on-Demand Support Fax-on-Demand is a 24-hour information retrieval system containing a library of documents on a wide range of technical information. You can access Fax-on-Demand from a touch-tone telephone at 512 418 1111. E-Mail S...
Page 44 - Technical Support Form
Technical Support Form Photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps ...
Page 45 - National Instruments Products; Other Products
NI 2501/2503 Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your curren...
Page 47 - Documentation Comment Form
Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: NI 2501/2503 User Manual Edition Date: July 1998 Part Number: 321906B-01 Please comment on the comp...
Page 48 - Symbols
© National Instruments Corporation G-1 NI 2501/2503 User Manual Glossary Prefix Meanings Value n- nano- 10 – 9 µ- micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 Symbols ° degrees Ω ohms % percent ± plus or minus A A amperes AC alternating current ANSI American National Stan...
Page 54 - Index; Numbers
© National Instruments Corporation I-1 NI 2501/2503 User Manual Index Numbers 1_WIRE_LO_REF signal (table), 1-9+5 V signal (table), 1-9 A AB<0..1> ± signal (table), 1-9 AB0 ± signal (table), 1-9 AB0A ± signal (table), 1-9 AB0B ± signal (table), 1-9 accessories for NI 2501/2503, B-1amplifier fo...
