NI 2501/2503 User Manual - Pdfstream.manualsonline.com
Contents
1. 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 Circuitry2. 400 KHz 10 dB 1 MHz Channel to Channel Crosstalk Isolation 50 dB Dynamic Characteristics Operating Speed Typical 25 000 cycles s Maximum 250 000 cycles s Settling Time 5 V to 5 V Step 6 in AB connector to PXI MIO 0 012 Accuracy With output buffer selected 8 5 s Without output buffer 9 0 s 0 006 Accuracy With output buffer selected 10 s Without output buffer 11 5 s 0 0015 Accuracy With output buffer selected 16 s Without output buffer 18 s Settling Time 5 V to 5 V Step 3 m cable to PXI MIO 0 012 Accuracy With output buffer selected 21 s Without output buffer 45 s Appendix A Specifications for NI 2501 National Instruments Corporation A 3 NI 2501 2503 User Manual 0 006 Accuracy With output buffer selected 30 s Without output buffer 60 s 0 0015 Accuracy With output buffer selected 80 s Without output buffer 160 s Note Settling time is greatly affected by the external wiring to the switch card You can improve the settling time by minimizing the wiring from the analog bus connection to the measurement device PXI Bus Int
3. 50 termination Dynamic Characteristics Maximum Operating Speed 200 cycles s Relay Operate Time 20 C 3 ms typical 5 ms max Relay Release Time 20 C 1 5 ms typical 5 ms max Expected Life Mechanical 180 cpm 5 107 operations Electrical at Maximum Load 2 106 operations PXI Bus Interface Slave PXI Trigger Bus Trigger Lines 8 Star Trigger 1 Power Requirement 5 V Typical 370 mA Maximum 700 mA Frequency Crosstalk 10 KHz lt 100 dB 100 KHz lt 80 dB 1 MHz lt 55 dB 10 MHz lt 30 dB 35 MHz lt 25 dB 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 68 pin male SCSI Environment Operating Temperature 0 to 50 C Storage Temperature 55 to 150 C Relative Humidity 5 to 85 non condensing Shock and Vibration Functio
4. For the relays that connect banks the switch name is BCx y where x and y are the bank numbers that are being connected For the relay that switches 1 Wire Lo Ref to COM0 the name is 1WIRE For the relay that switches CHx or CHx to COM0 the name is HLSELECT For the Amp Select switches NI 2501 only the names are AMP0 and AMP1 Appendix D Architecture Drawings NI 2501 2503 User Manual D 2 National Instruments Corporation Figure D 1 NI 2501 Switch Architecture CH11 CH11 CH10 CH10 CH9 CH9 CH8 CH8 CH7 CH7 CH6 CH6 CH5 CH5 CH4 CH4 CH3 CH3 CH2 CH2 CH1 CH1 CH0 CH0 CH12 CH12 CH13 CH13 CH14 CH14 CH15 CH15 CH16 CH16 CH17 CH17 CH18 CH18 CH19 CH19 CH20 CH20 CH21 CH21 CH22 CH22 CH23 CH23 CJS CJS 1 Wire Lo Ref COM1 COM1 AB0 AB0 COM0 COM0 AB1 AB1 COM2 COM2 COM3 COM3 Bank1 BC01 BC02 BC23 AB0 AB1 1WIRE AMP0 AMP1 Bank0 Bank2 Bank3 HLSELECT Appendix D Architecture Drawings National Instruments Corporation D 3 NI 2501 2503 User Manual Figure D 2 NI 2503 Switch Architecture CH11 CH11 CH10 CH10 CH9 CH9 CH8 CH8 CH7 CH7 CH6 CH6 CH5 CH5 CH4 CH4 CH3 CH3 CH2 CH2
5. 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 Contents NI 2501 2503 User Manual viii National Instruments Corporation Appendix B Accessories Appendix C Customizing Your Card Appendix D Architecture Drawings Appendix E Common Questions Appendix F Customer Communication Glossary Index Figures Figure 1 1 Front Connector Pinout Assignments for Two Wire Mode 1 5 Figure 1 2 Front Connector Pinout Assignments for One Wire Mode 1 6 Figure 1 3 Front Connector Pinout Assignments for Four Wire Mode 1
6. CH1 CH1 CH0 CH0 CH12 CH12 CH13 CH13 CH14 CH14 CH15 CH15 CH16 CH16 CH17 CH17 CH18 CH18 CH19 CH19 CH20 CH20 CH21 CH21 CH22 CH22 CH23 CH23 CJS CJS 1 Wire Lo Ref COM1 COM1 AB0 AB0 COM0 COM0 AB1 AB1 COM2 COM2 COM3 COM3 Bank1 BC01 BC02 BC23 AB0 AB1 Bank0 Bank2 Bank3 HLSELECT 1WIRE 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 faster scan rates the accuracy of the card declines due to the settling time of the card National Instruments recommends you set the scan rate to allow for enough settling time to ensure the desired accuracy How fast can I scan with the NI 2503 switch card The NI 2503 uses relays that have typical operate and release times of 3 ms In addition to the operate and release times the NI 2503 also requires from 0 5 to 1 0 ms for the relay contacts to stop bouncing The combination of these two times are known as debounce time The default debounce time for the NI 2503 switch card is set to just under 5 ms This setting allows the card to be scanned at 200 scans s However if the
7. You can use the driver software to configure the switch card for continuous or one time scanning In continuous scanning the switch card cycles through the scan list until you disable scanning For one time scanning the switch card cycles through the scan list only once You can also use software commands to clear the scan list or reset it to the beginning at any time The onboard control logic for the NI 2501 2503 switch card gives you direct access to open and close the relays and also the capability to download up to 1024 random scanning instructions The software included with the card automatically configures the NI 2501 2503 and downloads the scan list to hardware for you The scan list itself downloads directly into the memory of the card to deliver the fastest scan possible with no controller intervention You can configure the switch card to process the scan list once or to continuously loop through the scan list When configured to operate as a single switch card with multiple multiplexers such as four 6 x 1 two wire multiplexers the scan architecture makes it possible for each multiplexer to have its own parallel scan list which must be triggered together Also if the switch card is configured as a matrix the scanning architecture scans the matrix through a series of user definable states PXI Interface The NI 2501 2503 switch card has a PXI interface through which you can use your driver software to configure and contro
8. 1 to A 4 NI 2503 A 5 to A 7 NI SWITCH driver software 1 10 E 1 to E 2 O one wire multiplexer 1 6 2 4 operation of NI 2501 2503 2 1 to 2 8 block diagrams NI 2501 module 2 2 NI 2503 module 2 3 functional overview 2 1 multiplexer 2 4 to 2 5 PXI interface 2 6 to 2 8 initiating scanning 2 8 multicard triggering 2 8 triggers 2 6 to 2 7 random scanning 2 5 to 2 6 switch control circuitry 2 5 Index National Instruments Corporation I 3 NI 2501 2503 User Manual P physical specifications NI 2501 A 3 NI 2503 A 7 pinout assignments for front connector four wire mode figure 1 7 matrix mode figure 1 8 one wire mode figure 1 6 overview 1 4 two wire mode figure 1 5 power requirements NI 2501 A 3 NI 2503 A 7 product compliance specifications NI 2501 A 4 NI 2503 A 7 PXI interface 2 6 to 2 8 initiating scanning 2 7 to 2 8 multicard triggering 2 8 specifications NI 2501 A 3 NI 2503 A 6 triggers 2 6 to 2 7 external trigger input 2 7 modes 2 7 scanner advanced 2 7 PXI trigger bus specifications NI 2501 A 3 NI 2503 A 6 Q questions and answers E 1 to E 2 R random scanning 2 5 to 2 6 relay multiplexer 2 3 to 2 5 resistors installing C1 to C 2 ROW lt 0 3 gt signal table 1 9 S SCAN_ADV signal table 1 9 2 7 scanner advanced trigger 1 2 2 7 scanning failure to scan E 2 initiating 2 8 random scanning 2 5 to 2 6 speed of scanning E 1 SH68 68S shiel
9. 7 Figure 1 4 Front Connector Pinout Assignments to Create a 6 x 4 Matrix 1 8 Figure 2 1 NI 2501 Module Block Diagram 2 2 Figure 2 2 NI 2503 Module Block Diagram 2 3 Figure C 1 Bent and Trimmed Resistor C 2 Figure D 1 NI 2501 Switch Architecture D 2 Figure D 2 NI 2503 Switch Architecture D 3 Tables Table 1 1 Front Connector Signal Description 1 9 National Instruments Corporation 1 1 NI 2501 2503 User Manual 1 Routing Signals with Your NI 2501 2503 This manual describes the electrical and mechanical aspects of the NI 2501 FET multiplexer and the NI 2503 mechanical relay multiplexer and contains information concerning their installation and operation This manual uses the term NI 2501 2503 whenever information applies to both instruments About the NI 2501 2503 This section summarizes the features and operation of the NI 2501 2503 switch card Refer to Chapter 2 NI 2501 2503 Operation for more complete details In addition refer to Appendix A Specifications for detailed specifications of the two switch cards The NI 2501 is a FET switch
10. CJS 1 1not used in four wire mode Chapter 1 Routing Signals with Your NI 2501 2503 NI 2501 2503 User Manual 1 8 National Instruments Corporation Figure 1 4 Front Connector Pinout Assignments to Create a 6 x 4 Matrix For matrix mode connect all pins with the same name together external to the switch card The National Instruments TB 2606 terminal block connects the necessary pins to create the 6 x 4 matrix COL5 COL4 COL3 COL2 COL1 COL0 GND 5 V ROW3 ROW2 COL5 COL4 COL3 COL2 COL1 COL0 AB1 ROW2 AB0 ROW0 COL5 COL4 COL3 COL2 COL1 COL0 ROW1 ROW0 COL5 COL4 COL3 COL2 COL1 COL0 CJS 1 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19 53 20 54 21 55 22 56 23 57 24 58 25 59 26 60 27 61 28 62 29 63 30 64 31 65 32 66 33 67 34 68 COL5 COL4 COL3 COL2 COL1 COL0 EXT_TRIG_IN SCAN_ADV ROW3 ROW2 COL5 COL4 COL3 COL2 COL1 COL0 AB1 ROW2 AB0 ROW0 COL5 COL4 COL3 GND COL2 COL1 COL0 ROW1 ROW0 COL5 COL4 COL3 COL2 COL1 COL0 CJS 1 1_WIRE_LO_REF1 1not used in matrix mode Chapter 1 Routing Signals with Your NI 2501 2503 National Instruments Corporation 1 9 NI 2501 2503 User Manual Table
11. front panel and online documentation NI SWITCH eliminates the need to understand complex register programming and interrupt handling in the Microsoft operating systems and frees you to focus on creating your test system 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 graphical programming whereas LabWindows CVI enhances traditional programming languages Both packages include extensive libraries for data acquisition instrument control data analysis and graphical data presentation Using LabVIEW or LabWindows CVI can significantly reduce the development time for your data acquisition and control application LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW NI SWITCH VI Library a series of virtual instruments VIs for using LabVIEW with National Instruments switch hardware is included with the NI SWITCH driver LabWindows CVI features interactive graphics a state of the art user interface and uses the ANSI standard C programming language The LabWindows CVI NI SWITCH Library a series of functions for using LabWindows CVI with National Instruments switch hardware is included with the NI SWITC
12. software implements break before make this would reduce the scan rate to 100 scans s Typically when using a DMM to make accurate measurements the DMM requires hundreds of ms Consequently the DMM becomes the limiting factor in determining the scan rate What should I do if the software detects the board but the switches do not switch Verify that the switches do not switch Close your application program and then launch the soft front panel as described in the Setup and Test document you received with your kit The soft front panel shows the state of each relay or FET switch on the board Try closing and opening the switches Also be sure to check the return codes of the NI SWITCH operation to ensure that there are no errors negative value or warnings positive value You can also use the NI Spy utility to check for error codes Appendix E Common Questions NI 2501 2503 User Manual E 2 National Instruments Corporation Finally verify that your code is correct For reference see the examples described in the NI SWITCH Software User Manual The NI SWITCH driver also ships with several examples in source code Compare your algorithm to the ones in the examples What should I do if scanning does not work First ensure that you have configured the switch card and the instrument to match trigger lines The output trigger of the instrument should connect to the trigger input of the switch card In addition
13. your module make sure that no signals are connected to your module front connector Before installing your module in the PXI chassis you must install the resistors by performing the following steps 1 Ground yourself via a grounding strap or a ground connected to your PXI chassis Properly grounding yourself prevents damage to your PXI module from electrostatic discharge 2 Bend and trim the resistor lead as shown in Figure C 1 Be sure that the resistor does not extend more than 0 5 in above the surface of the circuit board 3 Insert the resistor into the appropriate socket labeled RCLx Appendix C Customizing Your Card NI 2501 2503 User Manual C 2 National Instruments Corporation Figure C 1 Bent and Trimmed Resistor 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 one wire mode four wire mode or 6 x 4 matrix mode use the signal names shown in Figures 1 2 through 1 4 respectively in Chapter 1 Routing Signals with Your NI 2501 2503 Relay or switch names are based on the signal names where applicable For example the switch that connects CH9 to COM1 and CH9 to COM1 is named CH9 For the other configuration relays the names are as follows
14. 09 725 725 55 France 01 48 14 24 24 01 48 14 24 14 Germany 089 741 31 30 089 714 60 35 Hong Kong 2645 3186 2686 8505 Israel 03 6120092 03 6120095 Italy 02 413091 02 41309215 Japan 03 5472 2970 03 5472 2977 Korea 02 596 7456 02 596 7455 Mexico 5 520 2635 5 520 3282 Netherlands 0348 433466 0348 430673 Norway 32 84 84 00 32 84 86 00 Singapore 2265886 2265887 Spain 91 640 0085 91 640 0533 Sweden 08 730 49 70 08 730 43 70 Switzerland 056 200 51 51 056 200 51 55 Taiwan 02 377 1200 02 737 4644 United Kingdom 01635 523545 01635 523154 United States 512 795 8248 512 794 5678 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 our applications engineers answer your questions more efficiently If you are using any National Instruments hardware or software products related to this problem include the configuration forms from their user manuals Include additional pages if necessary Name __________________________________________________________________________ Company _______________________________________________________________________ Address ________________________________________________________________________ __________________________________________________
15. 1 1 Front Connector Signal Description Signal Name Type Description 5 V Output 5 VDC Source Powers the temperature sensor on the terminal block 0 2 mA of source protected by a resettable poly fuse GND Output Ground CJS Input Cold junction Temperature Sensor Input Connects to the temperature sensor of the terminal block 1_WIRE_LO_REF Input The common reference signal used in one wire mode EXT_TRIG_IN Input External Trigger Input Trigger from an instrument to advance the switch card to the next scan entry SCAN_ADV Output Scanner Advanced Trigger to an instrument that indicated the switch card has advanced to the next scan and relays are debounced CH lt 0 47 gt one wire CH lt 0 23 gt two wire CH lt 0 11 gt A four wire CH lt 0 11 gt B four wire Input Output Channels Where signals are connected to the switch card CHx and CHx are switched together COM0 one wire COM lt 0 3 gt two wire COM lt 0 1 gt A four wire COM lt 0 1 gt B four wire Input Output Common The common for each bank AB0 one wire AB lt 0 1 gt two wire AB0A four wire AB0B four wire Input Output Analog Bus Used to wire multiple switch cards to an instrument such as a DMM COL lt 0 5 gt Input Output Columns Where signals are connected to the switch card The card behaves as a matrix when proper external wiring is added ROW lt 0 3 gt Inp
16. 1 1993 EMC Directive Immunity EN 50082 1 1992 Emissions EN 55011 1991 Group 1 Class A at 10 m Appendix A Specifications for NI 2503 National Instruments Corporation A 5 NI 2501 2503 User Manual NI 2503 Input Characteristics Number of Relays Available as Channels 24 Common Mode Voltage Channel to Channel 30 Vrms 60 VDC Channel to Earth 30 Vrms 60 VDC Maximum Allowed Voltage Differential Mode or Single ended AC 30 Vrms DC 60 VDC Maximum Switching Capacity Differential Mode or Single ended DC 1 A 30 VDC Maximum Switching Power per Differential Channel or Single ended 60 VA 30 W Contact on Resistance Initial 100 m Contact Material Gold clad Silver Alloy Transfer Characteristics Thermal E M F Differential lt 2 V Maximum Frequency Bandwidth 50 Termination Worst case channel 35 MHz Appendix A Specifications for NI 2503 NI 2501 2503 User Manual A 6 National Instruments Corporation Channel to Channel Crosstalk Isolation Differential
17. 2503 User Manual Figure 2 2 NI 2503 Module Block Diagram Front Connector PXIbus Connector CH0 CH5 Com0 CH6 CH11 CH12 CH17 CH18 CH23 Com1 Com2 Com3 AISENSE Cold Junction Sensor Relay Mux Relay Mux Relay Mux Relay Mux Relay Mux One Wire Two Wire Select Relay Control Triggers PXI Interface Scan Memory Analog Bus0 Analog Bus1 Chapter 2 NI 2501 2503 Operation NI 2501 2503 User Manual 2 4 National Instruments Corporation Multiplexer The relay multiplexer consists of four banks of six channels The switches for the six channels in each bank connect the channels to a common output for each bank Bank 0 consists of Channels 0 5 and Common 0 Bank 1 consists of Channels 6 11 and Common 1 Bank 2 consists of Channels 12 17 and Common 2 Bank 3 consists of Channels 18 23 and Common 3 Each channel connects to the corresponding bank common by closing its relay FET switch You can have multiple channels connected to the bank common at the same time Bank connection relay FET switches can combine the commons of the four banks See Appendix D Architecture Drawings for illustrations of the NI 2501 and NI 2503 architecture The NI 2503 relays are single side stable When power is removed from the relay coil the relay returns to its de energized state The de energized state opens all the relays disconnecting the device from external input
18. 3 CH22 CH21 CH20 CH19 CH18 GND 5 V COM3 COM2 CH17 CH16 CH15 CH14 CH13 CH12 AB1 AB0 CH11 CH10 CH9 1_WIRE_LO_REF1 CH8 CH7 CH6 COM1 COM0 CH5 CH4 CH3 CH2 CH1 CH0 CJS0 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19 53 20 54 21 55 22 56 23 57 24 58 25 59 26 60 27 61 28 62 29 63 30 64 31 65 32 66 33 67 34 68 CH23 CH22 CH21 CH20 CH19 CH18 EXT_TRIG_IN SCAN_ADV COM3 COM2 CH17 CH16 CH15 CH14 CH13 CH12 AB1 AB0 CH11 CH10 CH9 GND CH8 CH7 CH6 COM1 COM0 CH5 CH4 CH3 CH2 CH1 CH0 CJS0 1not used in two wire mode Chapter 1 Routing Signals with Your NI 2501 2503 NI 2501 2503 User Manual 1 6 National Instruments Corporation Figure 1 2 Front Connector Pinout Assignments for One Wire Mode CH47 CH46 CH45 CH44 CH43 CH42 GND 5 V COM3 CH42 CH48 1 COM2 CH36 CH41 1 CH41 CH40 CH39 CH38 CH37 CH36 AB1 1 AB0 CH35 CH34 CH33 1_WIRE_LO_REF CH32 CH31 CH30 COM1 CH30 CH35 1 COM0 CH29 CH28 CH27 CH26 CH25 CH24 CJS 1 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19
19. 53 20 54 21 55 22 56 23 57 24 58 25 59 26 60 27 61 28 62 29 63 30 64 31 65 32 66 33 67 34 68 CH23 CH22 CH21 CH20 CH19 CH18 EXT_TRIG_IN SCAN_ADV COM3 CH18 CH23 1 COM2 CH12 CH17 1 CH17 CH16 CH15 CH14 CH13 CH12 AB1 1 AB0 CH11 CH10 CH9 GND CH8 CH7 CH6 COM1 CH6 CH11 1 COM0 CH5 CH4 CH3 CH2 CH1 CH0 CJS 1 1not used in one wire mode Chapter 1 Routing Signals with Your NI 2501 2503 National Instruments Corporation 1 7 NI 2501 2503 User Manual Figure 1 3 Front Connector Pinout Assignments for Four Wire Mode CH11B CH10B CH9B CH8B CH7B CH6B GND 5 V COM1B COM0B CH5B CH4B CH3B CH2B CH1B CH0B AB0B AB0A CH11A CH10A CH9A 1_WIRE_LO_REF1 CH8A CH7A CH6A COM1A COM0A CH5A CH4A CH3A CH2A CH1A CH0A CJS 1 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19 53 20 54 21 55 22 56 23 57 24 58 25 59 26 60 27 61 28 62 29 63 30 64 31 65 32 66 33 67 34 68 CH11B CH10B CH9B CH8B CH7B CH6B EXT_TRIG_IN SCAN_ADV COM1B COM0B CH5B CH4B CH3B CH2B CH1B CH0B AB0B AB0A CH11A CH10A CH9A GND CH8A CH7A CH6A COM1A COM0A CH5A CH4A CH3A CH2A CH1A CH0A
20. C Rules This device complies with the FCC rules only if used with shielded interface cables of suitable quality and construction National Instruments used such cables to test this device and provides them for sale to the user The use of inferior or nonshielded interface cables could void the user s authority to operate the equipment under the FCC rules If necessary consult National Instruments or an experienced radio television technician for additional suggestions The following booklet prepared by the FCC may also be helpful Interference to Home Electronic Entertainment Equipment Handbook This booklet is available from the U S Government Printing Office Washington DC 20402 Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Conventions The following conventions are used in this manual lt gt Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a port bit or signal name for example CH lt 0 7 gt stands for the signals CH0 through CH7 This icon to the left of bold italicized text denotes a note which alerts you to important information This icon to the left of bold italicized text denotes a caution which advises you of precautions to take to av
21. Computer Based Instruments NI 2501 2503 User Manual 24 Channel Two Wire Multiplexer NI 2501 2503 User Manual July 1998 Edition Part Number 321906B 01 Internet Support E mail support natinst com FTP Site ftp natinst com Web Address http www natinst com Bulletin Board Support BBS United States 512 794 5422 BBS United Kingdom 01635 551422 BBS France 01 48 65 15 59 Fax on Demand Support 512 418 1111 Telephone Support USA Tel 512 795 8248 Fax 512 794 5678 International Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 288 3336 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 Taiwan 02 377 1200 United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin Texas 78730 5039 USA Tel 512 794 0100 Copyright 1998 National Instruments Corporation All rights reserved 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 Nati
22. H driver Third Party Software The NI SWITCH instrument driver also includes support files for Microsoft Visual C and Microsoft Visual Basic Please see the NI SWITCH readme file for version support information 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 following pages illustrate the key functional components of the switch card modules Figure 2 1 shows the NI 2501 and Figure 2 2 shows the NI 2503 The major components of the NI 2501 2503 modules are as follows Multiplexer Relay FET switch control circuitry Random scanning PXIbus interface Triggers Chapter 2 NI 2501 2503 Operation NI 2501 2503 User Manual 2 2 National Instruments Corporation Figure 2 1 NI 2501 Module Block Diagram Front Connector PXIbus Connector CH0 CH5 Com0 CH6 CH11 CH12 CH17 CH18 CH23 Com1 Com2 Com3 AISENSE Cold Junction Sensor FET Mux FET Mux FET Mux FET Mux FET Mux One Wire Unity Gain Amplifier Select Two Wire Select FET Switch Control Triggers PXI Interface Scan Memory Analog Bus0 Analog Bus1 Chapter 2 NI 2501 2503 Operation National Instruments Corporation 2 3 NI 2501
23. P Support To access our FTP site log on to our Internet host ftp natinst com as anonymous and use your Internet address such as joesmith anywhere com as your password The support files and documents are located in the support directories 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 Support Currently USA Only You can submit technical support questions to the applications engineering team through e mail at the Internet address listed below Remember to include your name address and phone number so we can contact you with solutions and suggestions support natinst com Telephone and Fax Support National Instruments has branch offices all over the world Use the list below to find the technical support number for your country If there is no National Instruments office in your country contact the source from which you purchased your software to obtain support Country Telephone Fax Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Brazil 011 288 3336 011 288 8528 Canada Ontario 905 785 0085 905 785 0086 Canada Qu bec 514 694 8521 514 694 4399 Denmark 45 76 26 00 45 76 26 02 Finland 09 725 725 11
24. SI American National Standards Institute B breakpoint a specified point in program code where the program pauses to perform some action a breakpoint interrupt can be added to a scan list for debugging or other special needs Glossary NI 2501 2503 User Manual G 2 National Instruments Corporation bus the group of conductors that interconnect individual circuitry in a computer Typically a bus is the expansion vehicle to which I O or other devices are connected Examples of PC buses are the ISA and PCI bus C C Celsius channel pin or wire lead on the multiplexer to which you apply or from which you read the analog or digital signal Signals can be single ended or differential cold junction compensation a method of compensating for inaccuracies in thermocouple circuits contact bounce the intermittent switching that occurs when the movable metal parts of a relay make or break contact D DC direct current debounced indicates when the contact bounce has ended See contact bounce device a plug in board card or pad that can contain multiple channels and conversion devices Some examples of devices are computers multimeters multiplexers oscillators operator interfaces and counters digital multimeter a multifunction meter used to make measurements such as voltage current resistance frequency temperature and so on DIN Deutsche Industrie Norme DMA direct memory access a method by which data ca
25. _____________________________ Fax ___ ________________Phone ___ __________________________________________ Computer brand____________ Model ___________________Processor _____________________ Operating system include version number ____________________________________________ Clock speed ______MHz RAM _____MB Display adapter __________________________ Mouse ___yes ___no Other adapters installed_______________________________________ Hard disk capacity _____MB Brand_________________________________________________ Instruments used _________________________________________________________________ _______________________________________________________________________________ National Instruments hardware product model _____________ Revision ____________________ Configuration ___________________________________________________________________ National Instruments software product ___________________ Version _____________________ Configuration ___________________________________________________________________ The problem is __________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ List any er
26. ____________________________________________________________________ List All Boards in PXI Mainframe PXI Slot Manufacturer Description and Function 1 2 3 4 5 6 7 8 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 completeness clarity and organization of the manual _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ If you find errors in the manual please record the page numbers and describe the errors _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _____
27. __________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Thank you for your help Name _________________________________________________________________________ Title __________________________________________________________________________ Company _______________________________________________________________________ Address ________________________________________________________________________ _______________________________________________________________________________ E Mail Address __________________________________________________________________ Phone ___ __________________________ Fax ___ _______________________________ Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway 512 794 5678 Austin Texas 78730 5039 National Instruments Corporation G 1 NI 2501 2503 User Manual Glossary Prefix Meanings Value n nano 10 9 micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 109 Symbols degrees ohms percent plus or minus A A amperes AC alternating current AN
28. card and the NI 2503 is an armature relay switch card Each consists of a 24 x 1 two wire multiplexer in PXI Compact PCI format You can take advantage of the switch card s flexibility to handle a wide variety of test systems through the use of various accessories and software configurations You can use the National Instruments NI SWITCH software included with your kit to configure and operate the NI 2501 2503 switch card The NI 2501 2503 can also operate as two 12 x 1 or four 6 x 1 two wire multiplexers You can use software configurable switches to configure the switch card as a 48 x 1 one wire multiplexer for making large numbers of common referenced measurements In addition the NI 2501 2503 can operate as a 12 x 1 four wire multiplexer to handle resistive measurements such as thermistors or RTDs Finally you can use a National Instruments TB 2606 terminal block to further configure the NI 2501 2503 as a 6 x 4 two wire matrix The Connecting Signals section of this chapter contains more information on one wire two wire four wire and matrix configurations and includes diagrams of the pinout connections to make 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 size of the multiplex
29. ch card to route the scanner advanced SCANADV trigger to any PXI TTL trigger line the PXI star trigger or the SCAN_ADV pin on the front connector You can configure the switch card to generate the SCANADV trigger when a relay has settled or debounced All SCANADV trigger lines are compatible with TTL voltage levels Because the NI 2501 2503 has open collector drives on the PXI TTL trigger lines you can have multiple switch cards using the same trigger line in the multicard SCANADV mode Modes SCANADV has two modes of operation In its default mode the SCANADV trigger asserts for 1 s after the relay has debounced You can also configure the switch card for handshaking mode in which the SCANADV trigger goes high after a relay settles and the SCANADV trigger goes low after the external trigger input asserts Use this handshaking mode for multicard scanning Note The NI 2501 2503 ignores external triggers when it is not in a wait for trigger state while 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 the first switch es in the scan list to close and generates a scanner advanced trigger after the relay FET switches have settled or debounced When you use the m
30. ded cable B 1 shock and vibration specifications NI 2501 A 4 NI 2503 A 7 signal connections 1 4 to 1 9 exceeding maximum settings warning 1 4 front connector pinout assignments four wire mode figure 1 7 matrix mode figure 1 8 one wire mode figure 1 6 overview 1 4 two wire mode figure 1 5 signal descriptions table 1 9 software choices National Instruments application software 1 11 NI SWITCH driver software 1 10 third party software 1 11 specifications NI 2501 A 1 to A 4 CE mark compliance A 4 dynamic characteristics A 2 to A 3 environment A 4 input characteristics A 1 physical A 3 power requirements A 3 PXI bus interface A 3 PXI trigger bus A 3 shock and vibration A 4 transfer characteristics A 2 Index NI 2501 2503 User Manual I 4 National Instruments Corporation NI 2503 A 5 to A 7 CE mark compliance A 7 dynamic characteristics A 6 environment A 7 input characteristics A 5 physical A 7 power requirements A 7 PXI bus interface A 6 PXI trigger bus A 6 shock and vibration A 7 transfer characteristics A 6 static electricity component failure due to caution 1 4 switch control circuitry 2 5 switch failure E 1 to E 2 T TB 2605 terminal block 1 3 B 1 TB 2606 terminal block 1 1 1 8 2 5 B 1 TBX 68LP I O connector block B 1 TBX 68LPR I O connector block B 1 TBX 68S I O connector block 1 3 B 1 technical support F 1 to F 2 telephone and fax support number
31. easurement device to initiate a scan make sure scanning is enabled on the NI 2501 2503 before the measurement device starts to take measurements This ensures that the switch card has the correct signal routed and that the switch card is waiting for an external trigger from the measurement device Always configure the triggers in a system before configuring the measurement device or the NI 2501 2503 for scanning When triggers are configured a state change or pulse could occur on the trigger line This is also possible when you reset the switch card Multicard Triggering You can use multiple NI 2501 2503 switch cards together in conjunction with an instrument such as a DMM In multiple switch card systems be sure to identify one switch card as the master switch card All other switch cards for the system are identified as slave switch cards The master switch card can route an external trigger from the front connector to a PXI backplane trigger In addition the master switch card can route the SCANADV trigger from the PXI backplane to the front connector This functionality makes it possible to wire external triggers from to only one switch card in the system which simplifies the wiring scheme For more information refer to the NI SWITCH Software User Manual 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
32. er or matrix For example you can connect two cards to create a 48 x 1 two wire multiplexer or a 12 x 4 two wire matrix Caution The maximum voltage is different for the NI 2501 and NI 2503 switch cards If you intend to use more than one type of card be sure you do not exceed the maximum voltage of any card in your system Refer to Appendix A Specifications for information Analog Bus The NI 2501 2503 works with a four wire analog bus You connect the analog bus to the switch card through its main front panel connector You can use the analog bus to simplify connecting multiple cards to an instrument such as a digital multimeter DMM This bus makes it possible to create large systems using multiple switch cards For example if you have two NI 2501 2503 cards or one of each in two adjacent slots you can connect them through the analog bus and create a 48 x 1 two wire multiplexer With this flexibility you keep the wiring of the modules to a minimum while you create large switching solutions In such cases the scanning architecture uses some of the PXI trigger lines for synchronization and delivers full access to all of the scanning features for the cards The National Instruments software you receive with the NI 2501 2503 handles the complexity of programming the cards Triggers Two triggers are used to handshake the NI 2501 2503 switch with PXI instruments or other external instruments The Scanner Advanced trigger indicates
33. erface Slave PXI Trigger Bus Trigger Lines 8 Star Trigger 1 Power Requirement 5 V Typical 300 mA 12 V Typical 30 mA 12 V Typical 30 mA Physical Dimensions 10 by 16 cm 3 9 by 6 3 in Weight 0 254 kg 0 56 lb I O Connector 68 pin male SCSI 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 non condensing Shock and Vibration Functional Shock MIL T 28800E Class 3 30 g half sine shock pulse Also meets IEC 60068 2 27 Random Vibration MIL T 28800E MIL STD 810E Category 1 Operational 5 to 500 Hz 0 3 grms Non operational 5 to 500 Hz 2 4 grms Certifications and Compliances CE Mark Compliance This product meets applicable EU directives as follows Safety Isolation low voltage safety EN 61010
34. ght laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation Trademarks CVI LabVIEW NI SWITCH and PXI are trademarks of National Instruments Corporation Product and company names listed are trademarks or trade names of their respective companies WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS National Instruments products are not designed with components and testing intended to ensure a level of reliability suitable for use in treatment and diagnosis of humans Applications of National Instruments products involving medical or clinical treatment can create a potential for accidental injury caused by product failure or by errors on the part of the user or application designer Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel and all traditional medical safeguards equipment and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used National Instruments products are NOT intended to be a substitute for any form of established process proced
35. hed in line before the COM0 signal and the AB0 signal The amplifier helps to decrease the settling time of the FET switch The amplifier s high impedance isolates the FET from the resistance capacitance and inductance in the external wiring This isolation decreases the resistance capacitance time constant seen by the FET which improves settling time The amplifier has an offset that should be calibrated for more accurate measurements The calibration data can be stored into and retrieved from the EEPROM on the board The software you received with your switch card includes API function calls to retrieve and store calibration data When the amplifier is used the switch card becomes directional where CHx is for signal inputs and COM0 or AB0 are for signal outputs The NI 2501 also has an amplifier in the CJS0 to COM0 signal path This amplifier in the cold junction sensor signal path is used to improve settling time performance It prevents the impedance of the cold junction sensor from increasing the settling time when switching the CJS channel As a result when scanning thermocouples the settling time for the cold junction sensor channel should be about the same as for the channels with the thermocouples 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 f
36. l the card The NI 2501 2503 takes advantage of PXI features It uses the PXI TTL triggers to synchronize scanning with a measurement device such as a National Instruments NI 4060 PXI digital multimeter DMM Triggers External Trigger Input The NI 2501 2503 can use an external trigger input to advance between scan setups in a scan list Using the driver software you can configure the switch card to route the external trigger from any of the PXI TTL trigger lines the PXI star trigger or the EXT TRIG IN pin on the front connector Alternatively you can use a software command to trigger the switch card 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 measurement device All external trigger lines are compatible with TTL voltage levels and are edge sensitive The external trigger from the front connector requires a minimum pulse width of 500 ns The line has a low pass filter to prevent false triggering The minimum pulse width from the PXI TTL triggers and PXI star trigger is 70 ns Scanner Advanced The NI 2501 2503 can generate a scanner advanced trigger to indicate when the switch card is set up and ready to take measurements Using the driver software you can configure the swit
37. n be transferred to from computer memory from to a device or memory on the bus while the processor does something else DMA is the fastest method of transferring data to from computer memory DMM See digital multimeter drivers driver software software that controls a specific hardware device such as a switch card Glossary National Instruments Corporation G 3 NI 2501 2503 User Manual E external trigger a voltage pulse from an external source that triggers an event such as A D conversion F FET Field Effect Transistor H handshaking the use of two trigger lines between two instruments such as a switch and a DMM to synchronize their actions Hz hertz the number of scans read or updates written per second I in inches I O input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces Intelligent Virtual Instrument an advanced architecture for instrument drivers that includes features such as simulation and state caching ISA Industry Standard Architecture IVI See Intelligent Virtual Instrument M MB megabytes of memory matrix superset of multiplexer consists of connected rows and columns that allows for a direct connection from any row to any column movistor transient suppression device Glossary NI 2501 2503 User Manual G 4 National Instruments Corporation multiplexe
38. nal Shock MIL T 28800E Class 3 30 g half sine shock pulse Also meets IEC 60068 2 27 Random Vibration MIL T 28800E MIL STD 810E Category 1 Operational 5 to 500 Hz 0 3 grams Non operational 5 to 500 Hz 2 4 grams Certifications and Compliances CE Mark Compliance This product meets applicable EU directives as follows Safety Isolation low voltage safety EN 61010 1 1993 EMC Directive Immunity EN 50082 1 1992 Emissions EN 55011 1991 Group 1 Class A at 10 m National Instruments Corporation B 1 NI 2501 2503 User Manual B Accessories This appendix lists various National Instruments products you can use with your NI 2501 2503 module The TB 2605 terminal block has screw terminal connections for all channels bank commons analog bus and trigger signals You can use this card for multiplexer switching applications The terminal block has a temperature sensor that is used for thermocouple cold junction compensation The TB 2606 terminal block converts the switch card to a 6 x 4 two wire matrix configuration This terminal block creates the matrix configuration by connecting channels 0 6 12 18 1 7 13 19 5 11 17 23 Analog bus connectors plug into TB 2605 and TB 2606 terminal blocks These analog bus plugs connect the analog bu
39. nstruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyri
40. oid injury data loss or a system crash This icon to the left of bold italicized text denotes a warning which advises you of precautions to take to avoid being electrically shocked bold italic Bold italic text denotes a note caution or warning italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text from which you supply the appropriate word or value as in CHx 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 NI 2501 Amplifier 1 3 Connecting Signals 1 4 Front Connector 1 4 Contact Protection
41. onal Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this manual is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National I
42. r a switching device with multiple inputs that sequentially connects each of its inputs to its output typically at high speeds in order to measure several signals with a single analog input channel mux See multiplexer N NI SWITCH an IVI based instrument driver that supports the National Instruments line of switch cards P PXI PCI with extensions for instrumentation R random scanning scanning the channels in a mux in any order relay a switch that connects or disconnects the signal to a common through the physical movement of a metal arm RMA Return Material Authorization rms root mean square the square root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude RTD resistance temperature detector a metallic probe that measures temperature based upon its coefficient of resistivity S s seconds scan the data acquisition of signals connected to multiple channels of a multiplexer Typically the measurement device uses a trigger to advance the multiplexer to the next channel in the scan scan list a list of channels supplied to NI SWITCH that indicates the order in which channels will be scanned Glossary National Instruments Corporation G 5 NI 2501 2503 User Manual scanner advanced trigger the trigger generated by the switch card when scanning The trigger occurs after the switch card has closed a switch and the switch has settled sensor a de
43. re 1 4 in Chapter 1 The TB 2606 terminal block simplifies your wiring task by connecting the necessary pins on the switch card s front connector to create the 6 x 4 matrix In the matrix configuration you can connect any ROWx signal to any COLx signal Switch Control Circuitry The switch control circuitry SCC is responsible for opening and closing FET switches on the NI 2501 or relays on the NI 2503 You can load commands for the SCC into memory storage using the driver software you received with your kit Consult the online help or your software documentation for specific information on the appropriate commands There are two reasons for storing the commands in memory before the SCC can process them The operate release time for the NI 2503 is 3 to 5 ms Using memory storage the software can send multiple commands to the SCC without having to wait for a relay action to complete The memory is used to store a scan list necessary for hardware random scanning Random Scanning The NI 2501 2503 can perform random scanning In random scanning the switch card can scan the channels in any order The scan list is downloaded to onboard memory Commands in the scan list can Open or close relays Wait for an external trigger 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
44. ront connector This section also includes specifications and connection instructions for the signals on the NI 2501 2503 module connectors Caution Static electricity is a major cause of component failure To prevent damage to the electrical components in the module observe antistatic precautions whenever removing a module from the chassis or whenever working on a module Front Connector The pinout assignments for the NI 2501 2503 front connector vary depending on the wiring mode you use The following four diagrams show the pin assignments for two wire mode one wire mode four wire mode and matrix mode respectively Two wire mode is shown first because it is the most common configuration Table 1 1 following the diagrams describes the connector signals For more information on the wiring modes refer to the Multiplexer section in Chapter 2 NI 2501 2503 Operation Warning Any connections that exceed the maximum settings for the NI 2501 2503 can result in an electrical shock hazard and damage to the NI 2501 2503 module and any or all of the boards connected to the PXI backplane National Instruments is NOT liable for any damages or injuries resulting from exceeding maximum voltage ratings Refer to Appendix A Specifications for information Chapter 1 Routing Signals with Your NI 2501 2503 National Instruments Corporation 1 5 NI 2501 2503 User Manual Figure 1 1 Front Connector Pinout Assignments for Two Wire Mode CH2
45. ror messages ___________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ The following steps reproduce the problem ___________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 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 current configuration Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently National Instruments Products Using NI 2501 or NI 2503 _________________________________________________________ Hardware revision ________________________________________________________________ Switching mode__________________________________________________________________ List National Instruments Software Installed and Ver
46. rt F 2 environmental specifications NI 2501 A 4 NI 2503 A 7 external trigger input 1 2 2 6 to 2 7 EXT_TRIG_IN signal table 1 9 2 6 F fax and telephone support numbers F 2 Fax on Demand support F 2 flyback voltages caution 1 10 four wire multiplexer 1 7 2 5 Index NI 2501 2503 User Manual I 2 National Instruments Corporation front connector pinout assignments four wire mode figure 1 7 matrix mode figure 1 8 one wire mode figure 1 6 overview 1 4 two wire mode figure 1 5 signal descriptions table 1 9 FTP support F 1 G GND signal table 1 9 I initiating scanning 2 8 input characteristics NI 2501 A 1 NI 2503 A 5 I O connector blocks TBX 68LP B 1 TBX 68LPR B 1 TBX 68S 1 3 B 1 L LabVIEW software 1 11 LabWindows CVI software 1 11 M matrix mode 1 8 2 5 maximum voltage note 1 2 modes of operation 2 7 multicard triggering 2 8 multiplexer 2 4 to 2 5 four wire 2 5 matrix mode 2 5 one wire 2 4 two wire 2 4 N National Instruments application software 1 11 NI 2501 2503 See also operation of NI 2501 2503 accessories B 1 architecture drawings D1 to D 3 block diagrams NI 2501 module 2 2 NI 2503 module 2 3 common questions E 1 to E 2 customizing C1 to C 2 features 1 1 to 1 2 functional overview 2 1 maximum voltage note 1 2 overview 1 1 to 1 2 signal connections 1 4 to 1 9 software choices 1 10 to 1 11 specifications NI 2501 A
47. s F 2 terminal blocks analog bus connectors B 1 availability 1 10 TB 2605 1 3 B 1 TB 2606 1 1 1 8 2 5 B 1 transfer characteristics NI 2501 A 2 NI 2503 A 6 triggers external trigger input 1 2 2 6 to 2 7 modes 2 7 multicard triggering 2 8 overview 1 2 scanner advanced 1 2 2 7 two wire multiplexer 1 5 2 4 V voltage flyback voltages caution 1 10 maximum voltage note 1 2
48. s and outputs See Figures 1 1 through 1 4 in Chapter 1 Routing Signals with Your NI 2501 2503 for the pin names used for the different modes of operation Different names are used for the pin assignments in the different modes to better reflect the operation in the different modes and to simplify the task of wiring Two Wire Mode Two wire mode is the default and most common configuration for the NI 2501 2503 switch cards The CHx and CHx channels are switched together to the COMx and COMx signals for the corresponding bank One Wire Mode One wire mode doubles the channel count of what is available in two wire mode However the signals connected to the switch card need a common reference For one wire measurements Bank 0 includes extra relays between the multiplexed channel relays and COM0 The 1WIRE relay switch connects COM0 to the 1 Wire Lo Ref signal The HLSELECT relay connects COM0 to either CHx or CHx The de energized states for these relays configure the device for two wire measurements 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 adding some external wiring you can configure the switch card as a two wire 6 x 4 crosspoint matrix See Figu
49. s of two cards and terminate in banana plugs The TBX 68S I O connector block is a DIN rail mounted terminal block with screw terminal connections you can use for all channels bank outputs analog bus and trigger signals You can use this card for multiplexer switching applications The terminal block has a temperature sensor that is used for thermocouple cold junction compensation This is connected to the switch card through the SH68 68S cable SH68 68S shielded 68 conductor cable connects the NI 2501 2503 to the TBX 68S TBX 68LP or TBX 68LPR The TBX 68LP and TBX 68LPR are low cost termination accessories with 68 screw terminals CA 1000 is a configurable signal conditioning enclosure It uses the TBX 68LPR terminal block Contact National Instruments for more specific information about these products 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 Instruments offers a process current pack of four 249 0 1 5 ppm 0 25 W resistors The reference designator format for the current loop resistors is such that for input channel x the resistor is RCLx For example the resistor for channel 14 is RCL14 Caution Before installing the resistors in
50. sion NI SWITCH version ______________________________________________________________ LabVIEW version ________________________________________________________________ LabWindows CVI version __________________________________________________________ Other National Instruments software version ____________________________________________ ________________________________________________________________________________ Programming choice _______________________________________________________________ Other Products PXI Chassis make and model _______________________________________________________ Microprocessor __________________________________________________________________ Clock frequency or speed __________________________________________________________ Type of video board installed _______________________________________________________ Operating system version __________________________________________________________ Operating system mode____________________________________________________________ Programming language ____________________________________________________________ Programming language version______________________________________________________ Switch accessories________________________________________________________________ _______________________________________________________________________________ Instruments connected to switch _____________________________________________________ ___________
51. specifications are typical at 25 C unless otherwise noted NI 2501 Input Characteristics Number of Channels 24 Maximum Working Voltage 10 VDC from chassis ground Overvoltage Protection Signals CH lt 0 23 gt COM lt 0 3 gt Powered on or off 25 VDC Signals AB lt 0 1 gt Powered on 25 VDC Powered off 15 VDC FET Switch On Resistance Typical 50 Max 25 C 85 Max 85 C 100 Total Signal Path Resistance Channel x to Analog Bus x Typical 1650 Maximum 1900 Total Signal Path Resistance Channel x to Common x Typical 1900 Maximum 2150 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 60 V Frequency Bandwidth 50 source 1 M 25 pF load 3 dB
52. tation When you contact us we need the information on the Technical Support Form and the configuration form if your manual contains one about your system configuration to answer your questions as quickly as possible National Instruments has technical assistance through electronic fax and telephone systems to quickly provide the information you need Our electronic services include a bulletin board service an FTP site a fax on demand system and e mail support If you have a hardware or software problem first try the electronic support systems If the information available on these systems does not answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24 hour support with a collection of files and documents to answer most common customer questions From these sites you can also download the latest instrument drivers updates and example programs For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information call 512 795 6990 You can access these services at United States 512 794 5422 Up to 14 400 baud 8 data bits 1 stop bit no parity United Kingdom 01635 551422 Up to 9 600 baud 8 data bits 1 stop bit no parity France 01 48 65 15 59 Up to 9 600 baud 8 data bits 1 stop bit no parity FT
53. the scanner advanced trigger of the switch card should be connected to the input trigger of the instrument If the switch card is used to initiate the scan make sure the DMM is waiting for a trigger before enabling scanning on the switch card This is the recommended method for hardware scanning If the DMM is used to initiate the scan enable scanning on the switch card before configuring the DMM to start taking measurements Also be sure to check the return codes of the NI SWITCH operation to ensure that there are no errors negative value or warnings positive value You can also use the NI Spy utility to check for error codes Finally verify that your code is correct For reference see the examples described in the NI SWITCH Software User Manual The NI SWITCH driver also ships with several examples in source code Compare your algorithm to the ones in the examples Do I need to program the switch card myself The NI 2501 2503 comes with the NI SWITCH driver software which exports the full functionality of the card NI SWITCH handles the complex issues of direct memory access interrupts and operating system interfacing 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 documen
54. ure or equipment used to monitor or safeguard human health and safety in medical or clinical treatment 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 are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC This equipment has been tested and found to comply with the following two regulatory agencies Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Notices to User Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FC
55. ut Output Rows Where signals are connected to the switch card In matrix configuration any row can be connected to any column 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 inductive load These flyback voltages can severely damage the relay contacts and greatly shorten the life of the relay It is best to limit flyback voltages at your inductive load by installing a flyback diode for DC loads or a movistor for AC loads Terminal Blocks Several terminal blocks with screw terminals are available for easy signal connection to the NI 2501 2503 inputs Refer to Appendix B Accessories Software Choices You have several options to choose from when programming your National Instruments switch card You can use the NI SWITCH driver software or National Instruments application software NI SWITCH Driver Software The NI SWITCH instrument driver is an Intelligent Virtual Instrument IVI compliant instrument driver that is bundled with NI SWITCH cards at no cost NI SWITCH features a set of operations and attributes that exercise all the functionality of the switching hardware including configuration opening closing and scanning In addition NI SWITCH comes with an interactive soft
56. vice that responds to a physical stimulus heat light sound pressure motion flow and so on and produces a corresponding electrical signal settling time the amount of time required for a voltage to reach its final value within specified limits soft front panel a graphical program included with NI SWITCH that you can use to interactively control the switch T TBX Terminal Block Extension terminal block an accessory containing wire connection points typically screw terminals thermistor a semiconductor sensor that exhibits a repeatable change in electrical resistance as a function of temperature Most thermistors exhibit a negative temperature coefficient thermocouple a temperature sensor created by joining two dissimilar metals The junction produces a small voltage as a function of the temperature trigger any event that causes or starts some form of data capture TTL Transistor Transistor Logic V V volts VDC volts direct current VI virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program Glossary NI 2501 2503 User Manual G 6 National Instruments Corporation W W watts wire data path between nodes National Instruments Corporation I 1 NI 2501 2503 User Manual Inde
57. when the card has closed all the necessary switches for the next scan and the switches have settled or debounced This trigger is typically wired to a measurement device such as a DMM which is configured to take a reading when it receives the trigger The External Trigger Input trigger is sourced by another instrument such as the DMM and causes the NI 2501 2503 to advance to the next entry in the scan list The triggers can be routed to the front connector of the NI 2501 2503 to any of the PXI TTL triggers or to the PXI star trigger If no external trigger input is available you can have the software trigger the NI 2501 2503 to advance to the next entry in the scan list 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 2503 has very low thermal offset less than 2 V to ensure accurate measurements For cold junction compensation when switching thermocouples the NI 2501 2503 has a dedicated channel for a temperature sensor The National Instruments TB 2605 and TBX 68S terminal blocks both have onboard temperature sensors that connect to the dedicated cold junction sensor channel NI 2501 Amplifier The NI 2501 has an amplifier with a gain of 1 This amplifier can be switc
58. x Numbers 1_WIRE_LO_REF signal table 1 9 5 V signal table 1 9 A AB lt 0 1 gt 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 1 amplifier for NI 2501 1 3 analog bus 1 2 analog bus connectors for terminal blocks B 1 architecture drawings D 1 to D 3 B block diagrams NI 2501 module 2 2 NI 2503 module 2 3 bulletin board support F 1 C CA 1000 B 1 cable SH68 68S B 1 calibration data storing in EEPROM 1 3 CE Mark Compliance A 4 A 7 CH lt 0 23 gt signal table 1 9 CH lt 0 47 gt one wire signal table 1 9 CH lt 0 11 gt A signal table 1 9 CH lt 0 11 gt signal table 1 9 CJS signal table 1 9 COL lt 0 5 gt signal table 1 9 cold junction sensor channel 1 3 COM lt 0 3 gt signal table 1 9 COM lt 0 1 gt signal table 1 9 COM lt 0 1 gt B signal table 1 9 COM0 signal table 1 9 common questions E 1 to E 2 connecting signals See signal connections contact protection caution 1 10 conventions used in this manual v current loop receivers C1 to C 2 customer communication F 1 to F 2 customizing NI 2501 2503 C1 to C 2 D debounced switches 1 2 dynamic characteristics NI 2501 A 2 to A 3 NI 2503 A 6 E electrical hazards exceeding maximum settings warning 1 4 static electricity caution 1 4 electronic support services F 1 to F 2 e mail suppo
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