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National Instruments 1128 User's Manual

1. 2 SCXI 1127 1332 3 1 Matrix Expansion Cables 3 SCXI 1127 1332 4 5 SCXI 1127 1332 1 4 SOCXI 1127 1332 2 Figure 2 24 8 x 16 Matrix Parts Locator Diagram National Instruments Corporation 2 27 SCXI 1127 1128 User Manual 19 GLO 99 710 80 210 210 29 110 29 OLO 1 60 cit SCXI 1127 SCXI 1332 3 00 80 ni com SCXI 1127 SCXI 1332 4 Using the SCXI 1127 1128 Chapter 2 Figure 2 25 shows the schematic of the 8 x 16 matrix shown in Figure 2 24 SCXI 1127 SCXI 1332 1 Block Boundary Cable 6 Sit 2 c SCXI 1127 SCXI 1332 2 Figure 2 25 8 16 Matrix Schematic 2 28 SCXI 1127 1128 User Manual Chapter 2 Using the SCXI 1127 1128 Independent Mode The SCXI 1127 1128 powers up in independent mode In this mode you can close or open any switch on the module via NI SWITCH to the SCXI 1127 1128 software controllable
2. gt lt 5001 1331 3 e 9 P 0 0 x O o 3 gj 1 Wire 9 50 a Connection LB jo A Lo 22 V4 o o 35 o EE 338 s 57 2 Wire o ok m o E ooo Connection a SCXI 1127 n 889 E o 20 888 000 a g 889 o ls 2999 Sood b 9 5000 5 2 a lo Qaro lo o 49 jo 3 4 Wire R ok Connection 1 24 o n O a amp ASSY18426BB 01 lex gt Figure 2 10 Mixed Mode Scanning with SCXI 1331 You can scan the channels in any sequence you want You can connect more than one SCXI 1127 1128 module together using the HVAB backplane adapter from the SCXI 1357 1358 kits to expand the channel count of the system When combining different modes in one module it is important to use the channels efficiently Generally you should connect the 4 wire channels first followed by the 2 wire channels and finally
3. amp ASSY1842688 01 Figure 2 5 1 Wire Wiring Diagram Both channel 24 V and 59 V5 are measuring voltage sources The positive terminal of these sources go to screw terminals labeled 24 and 59 respectively The negative terminals or the common reference for the voltage source is wired to the 1 WIRE LO REF screw terminals The output of the multiplexer is available through the OUTO bus Resistance is measured at channel 4 and voltage at channels 24 and 59 4 Wire Channel Scanning Configuration SCXI 1127 1128 User Manual You can use an SCXI 1127 1128 as a 16 to 1 4 wire multiplexer Figure 2 6 shows a block diagram of the input switching structure in 4 wire mode You can connect up to 16 4 wire channels to the SCXI 1127 1128 using a SCXI 1331 terminal block The 4 wire multiplexer consists of dual 16 to 1 multiplexers 2 6 ni com Chapter 2 Using the SCXI 1127 1128 Out0 lt Out0 16 to 1 Multiplexer 15A4 ae ABO E lt a ABO EXCITATION Multipl C ON Multiplexer TU Switch Backplane Out2 4 AB2 2 0B 16 to 1 Multiplexer Switch 158 15B SENSE Multiplexer Figure 2 6 4 Wire Block Diagram When used with a DMM for 4 wire ohms measurement the upper differential multiple
4. o 18 2 H 3 8 Slot HVAB Backplane Adapter 4 2 Slot HVAB Backplane Adapter 7 SH9MD 9MD Cable V8 BAN4 Cable 5 1 Slot HVAB Backplane Adapter 8 12 Slot SCXI Chassis Position HVAB Plug 6 NI 4060 for PCI Figure 1 5 12 Slot Configuration Parts Locator Diagram Install the 8 slot HVAB backplane adapter behind slots 5 through 12 2 Install additional 2 slot and 1 slot HVAB backplane adapters behind slots 1 through 4 if needed 3 Install the 8 position HVAB plugs to connect the HVAB backplane adapters as needed 4 Connect HV8 BAN4 cable from the DMM to the HVAB connector behind slot 12 5 Connect the SHOMD 9MD cable from the DMM to the AUX IN connector behind slot 5 6 Youcaninstall any additional SCXI 1127 modules in any slot that has an HVAB backplane adapter behind it Notes Do not connect SHOMD 9MD cable to the AUX IN connector behind slot 4 on the 2 slot HVAB backplane adapter An SCXI 1127 1128 is required in slot 12 to establish communications with the chassis If slot 12 is empty the system will not operate It is this module that you must specify in MAX as the module cabled to the DMM National Instruments Corporation 1 9 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 Connecting the SCXI 1127 1128 to the DMM in a Multichassis System SCXI 1127 1128 User Manual The following sections desc
5. ir 10 Gebor8lASSU mi m m Ixog RS T ROW EXPANSION 0 89 81 2251 2 0 70 m m A COLUMN EXPANSION li wl W oo 00000 noo 1 11 1 Column Expansion Bus 3 Row Connections 5 Cable Strain Relief 2 Row Expansion Bus 4 Column Connections 6 Safety Ground Solder Lug SCXI 1127 1128 User Manual Figure 2 19 SCXI 1332 Terminal Block The SCXI 1127 1128 installed with the SCXI 1332 provides you with an 4 x 8 matrix without any extra wiring except for hooking up your signals to the columns and rows of the matrix Refer to Matrix Expansion for information on using multiple SCXI 1127 SCXI 1332 systems to build matrices larger than 4 x 8 Figure 2 20 shows an example of an SCXI 1332 connected to an SCXI 1127 1128 The SCXI 1127 1128 is configured for 4 x 8 matrix operation by the software This is an example of a power supply test station The purpose of this test station is to measure the output voltage of a power supply under various load conditions The loads are connected to the first four columns CO C3 The power supply is connected to row 0 and is the DUT A DMM is connected to row 1 and is used to measure the power 2 22 ni com Chapter 2 Using the SCXI 1127 1128 supply output volta
6. 5 wwvoSo Oe lex Eo iS OOOOOO l nooooooooooooooooooooooooooooooo Jo 0000000000000000000000000000000 AS G S SSY184268B 01 1 Figure 2 18 1 x 32 Matrix Wiring Diagram 4 x 8 Matrix Configuration You can configure the SCXI 1127 1128 with the SCXI 1332 as an 4 x 8 four rows by eight columns matrix The SCXI 1332 terminal block has 12 pairs of screw terminals eight pairs for accessing eight columns CO C7 and four pairs for accessing four rows RO R3 of the 4 x 8 matrix when installed in the front connector of the SCXI 1127 1128 In addition to the screw terminals the SCXI 1332 has six connectors for matrix expansion Four of the six connectors are for expanding the eight columns and the other two connectors are for row expansion The SCXI 1332 is shown in Figure 2 19 National Instruments Corporation 2 21 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 32 00000 00000 amp COLUMN EXPANSION 0 1 x N m ROW EXPANSIO ej
7. see 2 9 Mixed Mode Configuration esses 2 10 Hardware Timed and Software Scanning eee 2 11 Hardware Timed Scanning esee 2 12 National Instruments Corporation vii SCXI 1127 1128 User Manual Contents Hardware Timed Scanning Using a DMM 2 14 Hardware Timed Scanning Using External Instruments 2 14 Synchronous Scanning eere 2 14 Handshaking Scanning eee 2 15 Software Scanning isinna a e ete 2 17 Making Temperature Measurements esee nnns 2 17 Making Thermocouple Measurements eene 2 17 Making RTD Measurements esesseeeseeeeereen eene 2 19 Making Thermistor Measurements eene 2 19 Operating as a Matrix 5o nonne e ete epe eir e 2 20 32 x 1 Matrix Configuration sese emen eene 2 20 4 8 Matrix Configuration iss e Pee eee tees 2 21 Matrix BXpatisIOn ee ter ee itd n ERI EL Patre diet e NER ae 2 24 Independent Mode ee tette canes porte RR iege 2 29 Appendix A Specifications Appendix B Accessories Appendix C Customizing Your Module Appendix D SCXI 1127 1128 Front Connector Appendix E Common Questions Appendix F Technical Support Resources SCXI 1127 1128 User Manual viii ni com Contents Glossary Index Figures Figure 1 1 Installing the
8. Switch to the next channel in the scan list Synchronous Scanning Handshake scanning No Pulse SCANADVD line lt National Instruments Corporation Figure 2 11 Hardware Scanning Flowchart 2 13 SCXI 1127 1128 User Manual Using the SCXI 1127 1128 2 Using the SCXI 1127 1128 Hardware Timed Scanning Using a DMM When using a DMM with the SCXI 1127 1128 synchronous mode is the only mode in which the DMM and the SCXI 1127 1128 operate The DMM issues a trigger to advance the multiplexer at regular intervals The DMM and the software guarantee that the switch has fully settled before the next measurement is taken The module that connects directly to the digital connector on the HVAB backplane adapter is referred to as the cabled module If you add additional SCXI 1127 1128 modules to your system the trigger is bused over the SCXI backplane Trig 0 allowing other modules to be triggered as shown in Figure 2 12 These additional modules are referred to as non cabled modules because they do not require the DMM to be cabled directly to them Front Connector Front Connector Front Connector RSC SCXI Module SCXI Module Backplane Pd A HVAB Connector HOURS Trig 0 Backplane From DMM AUX SCXI 1127 1128 User Manual F
9. 2 9 Figure 2 9 Signal Connections for a 4 Wire Resistance Measurement 2 10 Figure 2 10 Mixed Mode Scanning with an SCXI 1331 sees 2 11 Figure 2 11 Hardware Scanning Flowchart sseeee 2 13 Figure 2 12 Cabling a DMM and Using the TRIGO to Bus the VMC EXT TRIG IN to Non Cabled 2 14 Figure 2 13 Cabling an External DMM eene 2 15 Figure 2 14 Daisy Chained for Handshaking eee 2 16 Figure 2 15 Connecting an External DMM to an SCXI 1127 1128 in an SCXI 2000 Series Chassis eese 2 16 Figure 2 16 Temperature Measurement Wiring Diagram eee 2 18 Figure 2 17 2x4 1 Wire Matrix Configuration 00 0 cece eeeeseeeeceeeseeeseeneeeees 2 20 Figure 2 18 1 32 Matrix Wiring Diagram esee 2 21 Figure 2 19 SCXI 1332 Terminal Block eee 2 22 Figure 2 20 SCXI 1332 Connected to an SCXI 1127 sse 2 23 Figure 2 21 SCXI 1332 Connected to an SCXI 1127 1128 Schematic 2 24 Figure 2 22 8x8 Matrix Parts Locator Diagram see 2 25 Figure 2 23 8 X 8 Matrix Schematic sess 2 26 National Instruments Corporation ix SCXI 1127 1128 User Manual Contents Figure 2 24 Figure 2 25 Figure 2 26 Figure C 1 Figure C 2 Figure D 1 Figure D 2 Figure D 3 Figure D
10. o 900 Le o 5 9000 5000 m 2000 o 2000 a 558 57 lol F o BX Bil n Qj 5 1842688 01 4 Figure 2 16 Temperature Measurement Wiring Diagram The SCXI 1331 contains cold junction temperature sensor CJS This sensor is a special channel on the SCXI 1127 1128 dedicated to measuring the ambient temperature of the terminal block This channel is always scanned as a 2 wire channel Including a CJS channel in the scan list is optional You can include a CJS channel at any position in the list with any number of repetitions The SCXI 1331 temperature sensor outputs 0 2 0 024 V from 0 50 C and has an accuracy of 0 5 C over the 15 35 C range and 0 9 C over the 0 15 C and 35 50 C ranges National Instruments software can convert a thermistor voltage to the thermistor temperature In LabVIEW you can use the Convert Thermistor Reading virtual instrument VI in the Data Acquisition Signal Conditioning palette If you are using Measurement Studio or Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature sensor and any screw terminal The temperature sensor accuracy includes tolerances in all component values the effects caused by temperature and loading and self heating S
11. Row 0 C O gt Row 1 O C C M Figure 2 17 2 x 4 1 Wire Matrix Configuration 32 x 1 Matrix Configuration SCXI 1127 1128 User Manual You can use the SCXI 1127 1128 with the SCXI 1331 to make various matrix configurations such as a 1 x 32 32 columns by one row matrix OUTO0 COMO provide the row signals on the SCXI 1331 terminal block Screw terminals for 2 wire channel 0 provide access to column 0 of the 1 x 32 matrix Similarly the screw terminals for channel x provides access to column x 2 20 ni com Chapter 2 Using the SCXI 1127 1128 Figure 2 18 shows an example of the SCXI 1331 and SCXI 1127 1128 configured as a 1 x 32 2 wire matrix The diagram shows the 2 wire terminal block connections for channels 3 15 27 and OUTO You can use this configuration to connect Vsougcz to one or all of the device under test DUT channels VsouncE c E SCX1 1331 c 5 uno E zr 5 onol To Device Under 4 ler e DA eso Test 4 NIWNYLSNI 3 gt MEE TVNOLIVN or 5 31 SCXI 1127 269 D V To Device Under lt To Device Under Test 2 s 00000000000000000000000000000000 Test 3 4 1x3 69 prio O
12. 1 14 Connecting the SCXI 1127 1128 to the DMM in a PXI 1010 Chassis 1 16 DMM in PXI Slots 1 through 7 Configuration 1 16 DMM in PXI Slot 8 Configuration sese 1 17 Connecting the SCXI 1127 1128 to the DMM in the PXI 1011 Chassis 1 17 DMM in PXI Slots 1 through 3 Configuration 1 18 DMM in PXI Slot 4 Configuration see 1 18 Accessing the SCXI 1127 1128 through Other SCXI Modules Using a DAQ DEVICE necesse are ede testi rect 1 18 Using a DAQ Device on a PXI 1010 Chassis eee 1 20 Using a DAQ Device on a PXI 1011 Chassis ee 1 20 Connecting SCXI 1127 1128 to an External 1 20 Configuring and Self Test eerte t cov ened Re EE NR SE e EY e EGRE ege 1 22 Auto Detectng Modules eee eee ee e edere 1 22 Manually Adding Modules sse 1 23 Safety Information teva ee tere 1 24 Chapter 2 Using the SCXI 1127 1128 Operating as a Multiplexer Scanner rennen 2 1 2 Wire Channel Scanning Configuration esee 2 3 1 Wire Channel Scanning Configuration eee 2 5 4 Wire Channel Scanning Configuration eese 2 6 4 Wire versus 2 Wire Resistance Measurement
13. S o C34 C4 29 C5 o 4 ot C6 28 0 o C6 _ C7 27 CO o 6 of Ci 26 C3 o 4 o 1 Cpe 25 C3 o 4 ot ca t DA 24 C6 ot C5 23 C6 o 4 ot c O7 22 Ci o amp ot cn Co 21 Ci o o co C2 20 4 Ot Cd C3 19 C4 5 o cx C5 18 C7 o C54 C6 17 C7 o C6 Co 16 C2 CO C1 15 C2 C1 C3 14 5 o o C34 C4 13 C5 o C4 C6 12 RO o C6 C7 11 RO C7 R1 10 R3 o R2 9 b oH R2 CJS 8 CJS o CJS 1_WIRE_LO_REF 7 5 V ISO o o 5 V ISO HVAB EN I NC 6 NC o 6 o NC I NC 5 NC o d o NC NC 4 NC o NC GND Non Isolated 3 5 V Non Isolated o Ne GND Non Isolated 2 GND Non Isolated o 6 o GND Non Isolated EXT TRIG IN 1 SCANADVD o d eo GND Non Isolated Figure D 4 SCXI 1127 1128 Front Connector Pin Assignments to Create an 4 x 8 Matrix D 5 SCXI 1127 1128 User Manual Appendix D SCXI 1127 1128 Front Connector Table D 1 Front Connector Signal Description Signal Name Type Description 5 V ISO Output 5 VDC isolated source Powers the temperature sensor on the terminal block 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 us
14. 82 9 0 6 9 AGAVNYD 1x3 9 lex go e LIOOOOQ aS 5 ASSY1842688 01 Multiplexer Outputs 6 2 Wire Mode Channel Numbering 7 4 Wire Mode Channel Numbering 8 Ground Reference for Trigger Signals 1 Wire Mode Channel Numbering 9 1 Wire Lo Reference 1 WIRE LO REF 1 External Trigger Input EXT TRIG IN Scanner Advanced Output SCANADVD Cable Strain Relief 0 Safety Ground Solder Lug SCXI 1127 1128 User Manual Figure 2 1 SCXI 1331 Signal Connections Depending on the input mode configuration of the SCXI 1127 1128 the SCXI 1331 has a maximum of 64 1 wire channels 32 2 wire channels or 16 4 wire channels The SCXI 1331 also has terminals for external triggering signals The SCXI 1127 1128 supports the standard voltmeter complete and scanner advanced triggering signals The following sections describe signal connections using the SCXI 1331 and the various input mode configurations For more information on scanning and triggering consult the Hardware Timed and Software Scanning section 2 2 ni com Chapter 2 Using the SCXI 1127 1128 The SCXI 1127 1128 contains a safety interlocking mechanism that prevents high voltages from appearing on
15. 3 ms typical 5 ms max Relay release time at 20 C 1 5 ms typical 5 ms max Expected life Mechanical at 180 cpm 5 x 107 operations Electrical at maximum load 2 x 10 operations Operating life variations versus switching conditions differential or single ended mode operation at 20 cpm Volts Amps Operational Life Cycles 30 VDC 200 000 250 Vins 200 mA 50 000 250 VDC 200 mA 50 000 250 Vins 250 100 000 250 VDC 250 LA 100 000 Trigger Characteristics Scanner advanced pulsewidth 1 1 us External trigger input pulsewidth 500 ns min Stability Recommended warm up time 5 minutes SCXI 1127 1128 User Manual A 2 ni com Appendix A Specifications for SCXI 1127 Physical DimensioDs Gites 3 0 by 17 2 by 20 3 cm 1 2 by 6 9 by 8 0 in Environment Operating temperature 0 to 50 C Storage 20 to 70 C Relative humidity 1096 to 9096 noncondensing Electromagnetic compatibility EMC EMISSIONS eet tod E rre Refer to the document supplied with the chassis for compliance to relevant directives EMI FCC Class A compliant Safety Designed in accordance with IEC 61010 1 UL 3111 1 and CAN CSA C22 2 No 1010 1 for electrical measuring and test equipment A
16. 1 5 safety information 1 24 to 1 25 software installation 1 2 to 1 3 manually adding modules 1 23 matrix operation 2 20 to 2 28 2x4 one wire matrix configuration figure 2 20 4x8 matrix configuration 2 21 to 2 24 schematic for SCXI 1332 connected to SCXI 1127 1128 figure 2 24 SCXI 1332 connected to SCXI 1127 figure 2 23 SCXI 1332 terminal block figure 2 22 32x matrix configuration 2 20 to 2 21 matrix expansion 2 24 to 2 28 8x8 matrix parts locator diagram figure 2 25 8x8 matrix schematic figure 2 26 National Instruments Corporation F3 Index 8x16 matrix parts locator diagram figure 2 27 8x16 matrix schematic figure 2 28 Measurement amp Automation utility 1 22 mixed mode scanning configuration 2 10 to 2 11 multiple chassis system installing See installation multiplexer scanner operation 2 1 to 2 20 1 wire channel scanning configuration 2 5 to 2 6 block diagram 2 5 wiring diagram 2 6 2 wire channel scanning configuration 2 3 to 2 4 block diagram 2 3 wiring diagram 2 4 4 wire channel scanning configuration 2 6 to 2 9 block diagram 2 7 wiring diagram 2 8 4 wire versus 2 wire resistance measurement 2 9 to 2 10 signal connections for 2 wire measurement figure 2 9 signal connections for 4 wire measurement figure 2 10 custom terminal blocks 2 3 hardware timed scanning 2 11 to 2 16 handshake scanning 2 15 to 2 16 overview 2 11 to 2 12 scanning flowchart figure
17. 1128 User Manual Glossary W W watts wire data path between nodes SCXI 1127 1128 User Manual G 6 ni com Index Numbers 1 wire channel scanning configuration 2 5 to 2 6 block diagram 2 5 wiring diagram 2 6 1_WIRE_LO_REF signal description table D 6 one wire channel scanning configuration 2 5 to 2 6 2 wire channel scanning configuration 2 3 to 2 4 block diagram 2 3 wiring diagram 2 4 2x4 one wire matrix configuration figure 2 20 4 wire channel scanning configuration 2 6 to 2 9 block diagram 2 7 wiring diagram 2 8 4 wire versus 2 wire resistance measurement 2 9 to 2 10 signal connections for 2 wire measurement figure 2 9 signal connections for 4 wire measurement figure 2 10 4x8 matrix configuration 2 21 to 2 24 schematic for SCXI 1332 connected to SCXI 1127 1128 figure 2 24 SCXI 1332 connected to SCXI 1127 figure 2 23 SCXI 1332 terminal block figure 2 22 5 V signal table D 6 8x8 matrix parts locator diagram figure 2 25 schematic figure 2 26 8x16 matrix parts locator diagram figure 2 27 schematic figure 2 28 National Instruments Corporation 32x1 matrix configuration 2 20 to 2 21 A accessories B 1 to B 2 adding modules manually 1 23 auto detecting modules 1 22 to 1 23 C C lt 0 7 gt signal table D 6 cable accessories B 1 CH lt 0 15 gt A signal table D 6 lt 0 15 gt signal table D 6 CH lt 0 31 gt signal table D 6 CH
18. 4 Tables Table 1 1 Table D 1 SCXI 1127 1128 User Manual 8 x 16 Matrix Parts Locator Diagram eee 8X T6 Matnx Schematic 3 SCXI 1127 1128 Relay Configuration eee Removing the SCXI Module Cover eene Bent and Trimmed Resistor essere SCXI 1127 1128 Front Connector Pin Assignments for2 Wire Mode seta REG te od eee laete SCXI 1127 1128 Front Connector Pin Assignments for I Wire Mode ene tette ete eer tette ete ede SCXI 1127 1128 Front Connector Pin Assignments for A Wire Mode eds eee Bet rr Eee tpe iei SCXI 1127 1128 Front Connector Pin Assignments to Create n4 x8 Matrix i iu ee e ee ee tA bape ut a veces SCXI 1127 1128 Configurations eee Front Connector Signal Description esee ni com Installing and Configuring the SCXI 1127 1128 The SCXI 1127 and SCXI 1228 modules are high voltage multiplexer matrix modules The SCXI 1127 is a high density armature relay module The SCXI 1128 is a high density solid state relay module Both modules provide a 1 x 32 2 wire multiplexer and several switch matrix configurations on an SCXI platform The SCXI 1127 1128 can also operate as two 1 x 16 or four 1 x 8 2 wire multiplexers in independent mode allowing a single module to handle several multiplexing needs Through software configurable switches the module can al
19. Appendix C Customizing Your Module Ground yourself via a grounding strap or a ground connected to your SCXI chassis Properly grounding yourself prevents damage to your SCXI module from electrostatic discharge Remove the grounding screw from the top cover Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom of the module and pushing down Remove the rear panel by unscrewing the two remaining screws Slide the module out of its enclosure Bend and trim the resistor lead as shown in Figure C 2 Be sure that the resistor does not extend more than 0 5 in above the surface of the circuit board and that the leads do not protrude through the bottom of the board by more than 0 060 in Circuit Board 0 060 in 10 11 12 SCXI 1127 1128 User Manual Figure C 2 Bent and Trimmed Resistor Insert the resistor into the appropriate socket labeled RCLx Solder the leads to the pad on the bottom side of the module Slide the module back into its enclosure Install the hex bracket screw Install the rear panel Install the top cover and grounding screw C 2 ni com SCXI 1127 1128 Front Connector This appendix contains connector diagrams for the SCXI 1127 1128 switch cards The diagrams also show the signal names that are used when the modules are in 2 wire mode 1 wire mode 4 wire mode and 4 x 8 matrix configuration When you connect a custom termina
20. EEC Directives Readers in the EU EEC EEA must refer to the Manufacturer s Declaration of Conformity DoC for information pertaining to the CE Mark compliance scheme The Manufacturer includes a DoC for most every hardware product except for those bought for OEMs if also available from an original manufacturer that also markets in the EU or where compliance is not required as for electrically benign apparatus or cables Certain exemptions may apply in the USA see FCC Rules 15 103 Exempted devices and 15 105 c Also available in sections of CFR 47 The CE Mark Declaration of Conformity will contain important supplementary information and instructions for the user or installer Conventions lt gt bold italic monospace The following conventions are used in this manual Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example DBIO lt 3 0 gt The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold text denotes items that you must select or click
21. Relay operate time at 20 90 0 25 ms typical 0 5 ms max Relay release time at 20 90 0 08 ms typical 0 2 ms max Trigger Characteristics Stability Physical Environment Safety Scanner advanced pulsewidth 1 1 us External trigger input pulsewidth 500 ns min Recommended warm up time 5 minutes DIMENSIONS ue tete 3 0 by 17 2 by 20 3 cm 1 2 by 6 9 by 8 0 in Operating temperature 0 to 50 Storage 20 to 70 C Relative humidity 1096 to 9096 noncondensing Electromagnetic compatibility EMC EMISSIONS tere etre rine Refer to the document supplied with the chassis for compliance to relevant directives EM cu iet ele tede FCC Class A compliant Designed in accordance with IEC 61010 1 UL 3111 1 and CAN CSA C22 2 No 1010 1 for electrical measuring and test equipment Approved at altitudes up to 2000 m Installation Category II National Instruments Corporation A 5 SCXI 1127 1128 User Manual Appendix A Specifications for SCXI 1128 Pollution Degree 2 Indoor use only SCXI 1127 1128 User Manual A 6 ni com Accessories This appendix lists various National Instruments products you can use with your SCXI 1127 1128 module National Instruments Corporation The SCXI 1331 terminal block has screw
22. User Manual Ifyou use the SCXI 1127 1128 to initiate the scan make sure the DMM is waiting for a trigger before enabling scanning on the SCXI 1127 1128 e If you use the DMM to initiate the scan enable scanning on the SCXI 1127 1128 before configuring the DMM to start taking measurements This is the recommended method for scanning e Be sure to check the return codes of the NI SWITCH operation to ensure that there are no errors negative values or warnings positive values You can also use the NI Spy utility which is installed with NI SWITCH to check for error codes e Verify that your code is correct For reference see the examples described in the NI SWITCH Software User Manual NI SWITCH also ships with several examples in source code Compare your algorithm to the ones in the examples Do I need to program the SCXI 1127 1128 myself The SCXI 1127 1128 comes with the NI SWITCH driver software that exports the full functionality of the module NI SWITCH handles the complex issues of register writes to the module and operating system interfacing Can I plug a non SCXI 1127 1128 module into a slot that has a high voltage analog backplane Yes You can plug in a module that does not support the HVAB The non SCXI 1127 1128 module does not connect to the HVAB or the digital communication lines on the HVAB backplane adapter Must I install the complete high voltage analog backplane No You do not have to install the co
23. adapters SCXI 1127 1128 User Manual 1 12 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 Refer to Figure 1 7 to set up this multichassis configuration o 7 7 0 9 o AB2 Lf oo Hr e a lo s 2 Slot HVAB Backplane Adapter 1 Slot HVAB Backplane Adapter HV8 BAN4 Cable NI 4060 for PCI RON 5 6 7 8 SH9MD 9MD Cable 9 SH9MD 9MD Cable 8 Position HVAB Plug 10 HV8 HV8 Cable 8 Slot HVAB Backplane Adapter 11 4 Slot SCXI Chassis 12 Slot SCXI Chassis Figure 1 7 4 Slot to 12 Slot Multichassis Configuration Parts Locator Diagram National Instruments Corporation 1 13 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 1 Install the HVAB backplane adapters and jumper blocks in the 12 slot chassis as described in steps 1 through 3 in Single 12 Slot Chassis Configuration 2 Connect HV8 HV8 cable from the first chassis normally the connector behind slot 1 to the HVAB connector behind slot 12 of the next chassis 3 Connectthe SHOMD 9MD cable
24. additional 1 slot HVAB backplane adapters behind SCXI slots 1 and 2 if needed Install the 8 position HVAB plugs to connect the HVAB backplane adapters as needed 1 16 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 5 Connect the HV8 BAN4 cable from the DMM to the HVAB connector behind SCXI slot 4 6 Connect the SH9OMD 9MD cable from the DMM to the AUX IN connector 7 You can install any additional SCXI 1127 1128 modules in any slot that has an HVAB backplane adapter behind it DMM in PXI Slot 8 Configuration To install your DMM in PXI slot 8 follow these steps 1 Install your DMM in PXI slot 8 2 Inthe SCXI subsystem install the 2 slot HVAB backplane adapter behind SCXI slots 3 and 4 3 Install additional 1 slot HVAB backplane adapters behind SCXI slots 1 and 2 if needed 4 Install the 8 position HVAB plugs to connect the HVAB backplane adapters as needed 5 Connect the HV8 BAN4 cable from the DMM to the HVAB connector behind SCXI slot 4 of the SCXI subsystem 6 Youcan install any additional SCXI 1127 1128 modules in any slot that has an HVAB backplane adapter behind it 5 Note The SH9MD 9MD is not required for this configuration Connecting the SCXI 1127 1128 to the DMM in the PXI 1011 Chassis You will need the following items to complete the installation e PXI 1011 chassis with the SCXI 1127 1128 modules installed e HV8 BAN4 cable e DMM 1 8 in flathead screwdriver Consult you
25. by the 1 wire channels Hardware Timed and Software Scanning The SCXI 1127 1128 provides a very flexible scanning architecture You can scan the channels randomly and can have multiple input modes in the same scan This is useful for connecting multiple sensor types to one module There are two basic methods of scanning hardware timed scanning and software scanning In hardware timed scanning the measurement instrument such as a DMM communicates via digital trigger signals to the National Instruments Corporation 2 11 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 SCXI 1127 1128 In its simplest form hardware timed scanning uses one triggering signal to advance the multiplexer to the next channel in the scan This is called synchronous scanning hy Note When using a DMM with the SCXI 1127 1128 synchronous mode is the only mode in which the DMM and the SCXI 1127 1128 operate Another hardware timed scanning method is called handshaking While synchronous scanning requires just one signal from the instrument to the multiplexer handshaking requires an additional signal connected from the multiplexer to the instrument This additional trigger SCANADVD notifies the measuring instrument that the multiplexer has settled and the next measurement can be made This method is useful when using an SCXI 1127 1128 with external instruments to guarantee that both the measurement instrument and the multiplexer have s
26. columns of a matrix through the front connector of the SCXI 1127 1128 using the SCXI 1332 and matrix expansion cables Refer to Chapter 2 Matrix Expansion for further information on matrix expansion The SCXI 1127 1128 is designed to work well at both low and high voltages For low voltage measurements such as those taken with thermocouples the SCXI 1127 1128 uses relays with very low thermal offset to ensure accurate measurements At high voltages the SCXI 1127 can handle signals up to 250 at a 200 mA load and 30 VDC ata 1 A load The SCXI 1128 can handle signals up to 250 Vms at a 0 8 mA load and 30 VDC at a 10 mA load The SCXI 1127 1128 complies with the CE low voltage directive for an installation category II environment Refer to Appendix A Specifications for detailed specifications of the SCXI 1127 1128 The following section explains how to install the software required to use the SCXI 1127 1128 including installing the latest version of NI SWITCH After installing the software install the SCXI 1127 1128 hardware and its accessories then configure and test the SCXI 1127 1128 Installing the Software You can control the SCXI 1127 1128 programmatically in an application development environment ADE using NI SWITCH The supported ADEs include LabVIEW Measurement Studio Visual Basic and C or C environments To install software for the SCXI 1129 complete the following 1 Insert your NI SWITCH software CD into you
27. factor in determining the scan rate What should I do if the software detects the module 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 Set up and Test document you received with your kit The soft front panel shows the state of each relay switch on the module Try closing and opening the switches using the low level switch functions Check the return codes of the NI SWITCH operation to ensure that there are no errors negative values or warnings positive values You can also use the NI Spy utility which is installed with NI SWITCH to check for error codes Finally verify that your code is correct For reference see the examples described in NI SWITCH Software User Manual NI SWITCH 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 in the handshaking mode with a third party DMM National Instruments Corporation Ensure that you have configured the SCXI 1127 1128 and the instrument to correctly route all the trigger lines The output trigger of the instrument should connect to the trigger input of the SCXI 1127 1128 In addition make sure the scanner advanced trigger of the SCXI 1127 1128 connects to the input trigger of the instrument E 1 SCXI 1127 1128 User Manual Appendix Common Questions SCXI 1127 1128
28. in PXI slot 4 in order for it to control the SCXI 1127 1128 in the chassis Accessing the SCXI 1127 1128 through Other SCXI Modules Using a DAQ Device SCXI 1127 1128 User Manual You need the following items to complete the installation SCXI chassis with the SCXI 1127 1128 modules installed see the appropriate previous sections DAQ device cable adapter National Instruments DAQ device DAQ cable 1 8 in flathead screwdriver 1 18 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 Atleast one other SCXI module other than the SCXI 1127 1128 installed in the chassis Consult the documentation for your SCXI chassis and other SCXI modules for additional instructions and warnings Any non SCXI 1127 1128 modules should already be installed according to their installation instructions To set up the SCXI 1127 1128 module to be accessed by a DAQ device via another SCXI module follow these steps while referring to Figure 1 9 1 Non SCXI 1127 1128 Module 6 AB2 11 SCXI Chassis 2 MIO or DIO Device 7 AB2 12 Digital Signals Connector 3 8 SH9MD 9MD Cable 13 SCXI 1127 1128 Module 4 ABO 9 HV8 BAN4 Cable 14 HVAB Connector 5 NI 4060 for PCI 10 2 Slot HVAB Backplane Adapter Figure 1 9 Installing the SCXI 1127 1128 with Two DAQ Devices You should have already installed the SCXI 1127 1128 modules and their HVAB backplane adapters 1357 1358 according to the instructions found earlier
29. lt 0 63 gt signal table D 6 CJS amp signal table D 6 common questions E 1 to E 3 configuration and self test See also installation auto detecting modules 1 22 to 1 23 manually adding modules 1 23 possible configurations table 1 1 running Measurement amp Automation utility 1 22 safety information 1 24 to 1 25 connector See front connector conventions used in manual vi Convert Thermistor Reading VI 2 18 custom terminal block 2 3 customer education F 1 customizing your module C 1 to C 2 bent and trimmed resistor figure C 2 removing SCXI module cover figure C 1 SCXI 1127 1128 User Manual Index D DAQ devices accessing SCXI 1127 1128 through other SCXI modules 1 18 to 1 20 PXI 1010 chassis 1 20 PXI 1011 chassis 1 20 DMM digital multimeter See external DMMs NI DMM dynamic characteristics SCXI 1127 A 2 SCXI 1128 5 E environment specifications SCXI 1127 A 3 SCXI 1128 A 5 external DMMs connecting to SCXI 1127 1128 1 20 to 1 21 hardware timed scanning handshaking scanning mode 2 15 to 2 16 synchronous scanning mode 2 14 to 2 15 EXT_TRIG_IN signal table D 6 F front connector D 1 to D 6 1 wire mode figure D 3 2 wire mode figure D 2 4 wire mode figure D 4 4x8 matrix figure D 5 signal description table D 6 G GND signal table D 6 SCXI 1127 1128 User Manual I 2 H handshaking scanning mode 2 15 to 2 16 hardware installation See installa
30. negative screw terminals R2 is excited through the 1A positive and 2 8 ni com Chapter 2 Using the SCXI 1127 1128 negative screw terminals and sensed via 1B positive and negative screw terminals Ss Note OUTO and OUT2z are also referred to as COMO in a 4 wire configuration 4 Wire versus 2 Wire Resistance Measurement The primary advantage of using a 4 wire configuration is that it has greater accuracy than a 2 wire configuration while making resistance measurements Figure 2 8 shows signal connections for a 2 wire resistance measurement of a resistor 2 Wire Measurement V parasitic i pm v lt VsENsE i MAM 7 gt VsENSE wee 1 dex Parasitic resistance of i parasitic the cables connecting the resistance to the measurement device Figure 2 8 Signal Connections for a 2 Wire Resistance Measurement When measuring in a 2 wire configuration the voltmeter measures not only voltage across R due to the excitation current of the voltmeter but also the voltages developed across the parasitic resistance of the voltmeter cables When the resistance is finally calculated these parasitic voltages make the measurement inaccurate 2V parasitic 2R R Rimeas red parasitic Tex Therefore in a 2 wire resistance measurement the voltmeter ends up measuring a resistance that includes the parasitic resistance of the cables and switches T
31. on in the software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes variables emphasis a cross reference or an introduction to akey concept This font also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions and code excerpts Contents Chapter 1 Installing and Configuring the SCXI 1127 1128 Installing the SOL ware t ettet fite eet cep 1 2 Installing the Hardware oett espere ate qe 1 3 Installing the SCXI 1127 1128 Module into the SCXI Chassis 1 4 Connecting SCXI 1127 1128 to the DMM in a Single Chassis System 1 5 Single 4 Slot Chassis Configuration esse 1 6 Single 12 Slot Chassis Configuration see 1 8 Connecting the SCXI 1127 1128 to the DMM in a Multichassis System 1 10 4 Slot and 4 Slot Multichassis 1 10 4 Slot and 12 Slot Multichassis Configuration 1 12 12 Slot and 12 Slot Multichassis Configuration
32. reduces the safety isolation between the high voltage and safety ground National Instruments Corporation 1 25 SCXI 1127 1128 User Manual Using the SCXI 1127 1128 This chapter discusses in detail the operation of the SCXI 1127 1128 There are two major modes of operation multiplexer and matrix A third mode of operation independent mode allows you to access advanced features of the SCXI 1127 1128 Operating as a Multiplexer Scanner You can configure the SCXI 1127 1128 to operate as a multiplexer scanner Using this mode of operation you can configure channels in the scan in three different ways 2 wire 1 wire and or 4 wire channel configurations In all scanning modes only one channel is closed at a time in the multiplexer National Instruments Corporation 2 1 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 The SCXI 1331 terminal block consists of a shielded board with 84 screw terminals for easy connection to the SCXI 1127 1128 input connector The SCXI 1331 is shown in Figure 2 1 SCX1 1331 amp 5 ar uno m 00000 0 Zn vel 32 N3IAH LSNI TWNOLLVN Sr D 1 269 we 24 s ol 00000000000000000000000000000000 B80000000000000000000000000000000 Y
33. switches are shown in Figure 2 26 You can use the independent mode for advanced switching or scanning needs You can control these switches using NI SWITCH National Instruments Corporation 2 29 SCXI 1127 1128 User Manual Using the SCXI 1127 1128 Chapter 2 4012euuo y ST 34 erem jeuueyd Letz HO 10090000 0013 tav ELNO a ezoa 2 NEL jeuueuoK 80 8 E8VAH key 8VAH cav ISSN HSLHO 2110 6 9 mE L8VAH 91 8 H9 IOMURUOK 100 40j9euuo 10024 6 lav o LLNO na e aSNaSIV yms uedo 5 Peso TO SULOD 10024 0110 dW31fo dWalro 11014 ELNO 2100 3SN3SIV Figure 2 26 SCXI 1127 1128 Relay Configuration ni com 2 30 SCXI 1127 1128 User Manual Specifications Th
34. terminal connections for all channels bank commons analog bus and trigger signals You can use this module for multiplexer switching applications The terminal block has a temperature sensor that is used for thermocouple cold junction compensation The SCXI 1332 terminal block converts the switch card to a 4 x 8 2 wire matrix configuration This terminal block creates the matrix configuration by connecting channels 0 8 16 24 1 9 17 25 7 15 23 31 Use the high voltage matrix expansion cables to interconnect several SCXI 1332s to build matrices larger than 4 x 8 Use the 1 slot 2 slot and 8 slot HVAB backplane adapters to connect the HVAB of the SCXI 1127 1128 to the DMM You can also use them to establish HVAB connections across multiple SCXI 1127 1128 modules or SCXI chassis The 2 slot and 8 slot HVAB backplane adapters have four connectors on the external side two HVAB connectors one digital input in AUXIN connector and one digital input out AUXOUT connector The 1 slot SCXI 1357 has only HVAB connectors The purpose of the AUXIN connector is to cable the digital communication signals from the DMM to the SCXI 1127 1128 and finally to the SCXI chassis backplane as shown in Figure 1 9 Installing the SCXI 1127 1128 with Two DAQ Devices The AUXOUT connector connects the DMM communication signals to the next chassis if one is present Use a SH9MD 9MD cable to connect digital communication lines of the NI DMM to
35. the SCXI 1128 without the need for additional cabling Turn on the power to both the PXI and SCXI chassis Connecting the SCXI 1127 1128 to an External DMM You need the following items to complete this installation SCXI 1127 1128 User Manual SCXI 2000 2400 chassis with the SCXI 1127 1128 modules installed or SCXI 1000 1001 chassis containing a non SCXT 1127 1128 module connected to a DAQ device with the SCXI 1127 1128 modules installed SCXI 1357 or SCXI 1358 kit slot 2 slot and or 8 slot HVAB backplane adapter 1 20 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 SH9MD 9MD cable 8 position HVAB plug HV8 BAN4 cable External DMM if needed BAN2 WIRE kit two kits needed for 4 wire if not using the HV8 BANA cable Cable or wires to connect the handshaking lines to the SCXI 1127 1128 1 8 in flathead screwdriver Consult the documentation for your SCXI chassis and other SCXI modules for additional instructions and warnings You should have installed your SCXI 1127 1128 modules according to the instructions given in Installing the SCXI 1127 1128 Module into the SCXI Chassis section Any other SCXI modules should already be installed according to their installation instructions To install the SCXI 1127 1128 module with an SCXI chassis follow these steps 1 Install the SCXI 1127 1128s in the chassis and install HVAB as described in one of the Connecting the SCXI 1127 1128 Back
36. the driver s you do not want installed If a driver is already unchecked your computer has the same driver or a newer version of the driver already installed Note Ifa newer version of a driver is present on your the installer will not overwrite the driver 5 After completing the installation turn off your computer Installing the Hardware The following section describes how to install your SCXI 1127 1128 for use with SCXI chassis National Instruments DAQ devices and National Instruments DMMs National Instruments Corporation 1 3 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 Installing the SCXI 1127 1128 Module into the SCXI Chassis You need the following items to complete the installation e 5 1 1127 1128 e SCXI chassis 1 8 in flathead screwdriver 1 ABO 5 AB2 8 2 Slot HVAB Backplane Adapter 2 ABO 6 HV8 BAN4 9 SCXI Chassis 3 NI 4060 for PCI 7 SH9MD 9MD 10 SCXI 1127 1128 Module 4 AB2 Figure 1 1 Installing the SCXI 1127 1128 into an SCXI Chassis Follow these steps to install your SCXI 1127 1128 module into the SCXI chassis while referring to Figure 1 1 1 Turn off the computer that contains the DAQ DMM device or disconnect it from your SCXI chassis 2 Turnoffthe SCXI chassis Do not insert the SCXI 1127 1128 module into a chassis that is turned on 3 Insert the SCXI 1127 1128 module into the rightmost slot Gently guide th
37. the input connector when a terminal block is not present However when SCXI 1331 or SCXI 1332 is plugged into the front of the SCXI 1127 1128 the module detects its presence and allows the module to close relays If you are using a custom terminal block you must provide this interlocking feature on your terminal block so that it is possible for the SCXI 1127 1128 to detect that a terminal block is present Please refer to Appendix D SCXI 1127 1128 Front Connector for information on how to do this 2 Wire Channel Scanning Configuration You can use the SCXI 1127 1128 as a 32 channel 2 wire differential multiplexer Figure 2 2 shows the block diagram of the input switching structure in 2 wire mode You can connect up to 32 channels to the SCXI 1127 1128 using the SCXI 1331 terminal block The input signals are switched using a 32 to 1 multiplexer The output of the multiplexer is available at the OUTO and OUTO screw terminals on the SCXI 1331 Sy Note OUTO is also referred to as the multiplexer common or COMO 0 l Out0 lt lt i 3240 1 LCOMO 5BO Multiplexer COMO 4 e ABO Backplane CH31 CH31 ABO Switch Figure 2 2 2 Wire Block Diagram You can also connect the output of the SCXI 1127 1128 to the high voltage backplane using switch ABO to make the connection On power up switch ABO is open disconnecting
38. to 2 12 2 17 specifications SCXI 1127 dynamic characteristics A 2 environment A 3 input characteristics A 1 physical A 3 safety A 3 stability A 2 National Instruments Corporation 1 5 Index transfer characteristics A 1 to A 2 trigger characteristics A 2 SCXI 1128 dynamic characteristics A 5 environment A 5 input characteristics A 4 physical A 5 safety A 3 to A 6 stability A 5 transfer characteristics A 4 trigger characteristics A 5 stability specifications SCXI 1127 A 2 SCXI 1128 A 5 synchronous scanning mode 2 14 to 2 15 system integration by National Instruments F 1 T technical support resources F 1 to F 2 temperature measurements 2 17 to 2 20 RTD measurements 2 19 thermistor measurements 2 19 to 2 20 thermocouple measurements 2 17 to 2 19 thermistor measurements 2 19 to 2 20 thermocouple measurements 2 17 to 2 19 formulas 2 19 wiring diagram figure 2 18 transfer characteristics SCXI 1127 A 1 to A 2 SCXI 1128 A 4 trigger characteristics SCXI 1127 A 2 SCXI 1128 A 5 W Web support from National Instruments F 1 Worldwide technical support F 2 SCXI 1127 1128 User Manual
39. 2 13 synchronous scanning 2 14 to 2 15 using DMM 2 14 using external instruments 2 14 mixed mode configuration 2 10 to 2 11 SCXI 1331 signal connections figure 2 2 software scanning 2 11 to 2 12 2 17 SCXI 1127 1128 User Manual Index temperature measurements 2 17 to 2 20 RTD measurements 2 19 thermistor measurements 2 19 to 2 20 thermocouple measurements 2 17 to 2 19 NI Developer Zone F 1 NI DMM connecting SCXI 1127 1128 in multichassis system 1 10 to 1 16 4 slot and 4 slot multichassis configuration 1 10 to 1 12 4 slot and 12 slot multichassis configuration 1 12 to 1 14 12 slot and 12 slot multichassis configuration 1 14 to 1 16 connecting SCXI 1127 1128 in PXI 1010 chassis 1 16 to 1 17 DMM in PXI slot 8 1 17 DMM in PXI slots 1 through 7 1 16 to 1 17 connecting SCXI 1127 1128 in PXI 1011 chassis DMM in PXI slot 4 1 18 connecting SCXI 1127 1128 in single chassis system 1 5 to 1 9 items required 1 5 single 4 slot chassis configuration 1 6 to 1 7 single 12 slot chassis configuration 1 8 to 1 9 connecting SCXI 1127 1128 to DMM in single chassis system single 12 slot chassis configuration 1 8 to 1 9 hardware timed scanning 2 14 NI SWITCH software installation 1 2 to 1 3 SCXI 1127 1128 User Manual l 4 0 OUT lt 0 1 gt A signal table D 6 OUT lt 0 1 gt B signal table D 6 OUT lt 0 3 gt signal table D 6 signal table D 6 P physical specifications SCXI 1127 A 3
40. 7 1128 User Manual SCXI 1127 SCXI 1332 1 RO R1 2 R3 M Q oO oO Terminal Block Boundary n 1 4 4 4 R4 RO R5 R1 i R6 R2 i R7 R3 i SCXI 1127 SCXI 1332 2 Figure 2 23 8 x 8 Matrix Schematic To make a larger matrix such as a 8 X 16 matrix you must make both column and row expansions Follow these instructions to build a larger matrix 1 Expand the columns to the target number 16 in this case by connecting the rows of the appropriate number of SCXI 1332s two in this case using matrix expansion cables This results in a 4 x 16 matrix block 2 26 ni com Chapter 2 Using the SCXI 1127 1128 2 Expandthe rows to the target number 8 in this case by connecting the columns of the appropriate number of 4 x 16 matrix blocks two in this case using matrix expansion cables Figure 2 24 shows four SCXI 1332s connected to form a 8 x 16 matrix 5
41. CXI 1127 1128 User Manual 2 16 ni com Chapter 2 Using the SCXI 1127 1128 NI DAQ use Thermistor_ Convert function The VI takes the output voltage of the temperature sensor the reference voltage and the precision resistance and returns the thermistor temperature Alternatively you can use the following formulas T C Ty 273 15 where 7x is the temperature in Kelvin 1 Ty m MM a b InR c InR where a 1 295361 x 1073 b 2 343159 x 10 4 1 018703 x 107 resistance of the thermistor in ohms R 189 T 2 5 VrEMPOUT where Vrgypopr is the output voltage of the temperature sensor on 32 where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively Making RTD Measurements Figure 2 16 shows an RTD connected to channel 12 on the SCXI 1331 terminal block The RTD is connected in the 4 wire configuration It is recommended that you connect RTDs in a 4 wire configuration to eliminate the effects of lead resistance on the measurement See the 4 Wire versus 2 Wire Resistance Measurement section for more information Making Thermistor Measurements Figure 2 16 shows a thermistor R5 connected to channel 24 on the SCXI 1331 terminal block The thermistor is connected in the 2 wire configuration You can connect the thermistor in the two four or even 1 wire input configurations The choice is typically dictate
42. I 1127 1128 modules You can build these larger matrices using row and column expansion of the 4 x 8 matrix An example of row expansion is an 8 x 8 matrix A 4 x 16 matrix is an example of a column expansion A 8 16 matrix is an example of both a row and column expansion Figure 2 22 shows an example of two SCXI 1332 terminal blocks connected to form an 8 x 8 matrix You can connect the terminal blocks using matrix expansion cables that are available from National Instruments The columns of one module are connected to the other module doubling the number of rows from four to eight Figure 2 23 shows the schematic of an 8 x 8 matrix made this way The rows in module 2 are now rows through R7 due to the matrix expansion Similarly you can make a 4 x 16 matrix by connecting the rows of two SCXI 1332s 2 24 ni com Chapter 2 Using the SCXI 1127 1128 ocimo N Oa pY 1 1 SCXI 1127 332 1 2 Matrix Expansion Cables 3 SCXI 1127 1332 2 Figure 2 22 8 x 8 Matrix Parts Locator Diagram National Instruments Corporation 2 25 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 SCXI 112
43. I Module rm Communication avan oe os Trig 0 Backplane Backplane Connector Figure 2 13 Cabling an External DMM Handshaking Scanning The SCXI 1127 1128 supports a handshaking scanning mode This is implemented using the standard VMC SCANADVD handshaking scheme In this mode the multiplexer responds to every EXT_TRIG_IN trigger by advancing the multiplexer to the next channel waiting for the multiplexer to settle and then sending a scanner advanced pulse out ona SCANADVD output trigger back to the DMM For example you can connect the VMC of the DMM to the SCXI 1127 1128 via a screw terminal labeled EXT_TRIG_IN on the SCXI 1331 terminal block You must also connect the SCANADVD signal from the SCXI 1331 terminal block to your DMM external trigger input B Note Ifthe external DMM has an internal pull up on its external trigger input you need to configure the SCANADVD signal of the SCXI 1127 1128 as a negative going pulse If the external DMM has an internal pull down on its external trigger input you need to configure the SCANADVD signal of the SCXI 1127 1128 as a positive going pulse The module to which you connected your external DMM trigger signals is referred to as the cabled module If you add additional SCXI 1127 1128 modules to your system it is not necessary to cable the VMC to each National Instruments Corporation 2 15 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 module Y
44. MB matrix multiplexer NI SWITCH PXI Glossary the use of two trigger lines between two instruments such as a switch and a DMM to synchronize their actions the measurement instrument communicates via digital trigger signals high voltage analog bus hertz the number of scans read or updates written per second inches input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces megabytes of memory superset of multiplexer consists of connected rows and columns that allows for a direct connection from any row to any column 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 an IVI based instrument driver that supports the National Instruments line of switch cards PCI with extensions for instrumentation National Instruments Corporation G 3 SCXI 1127 1128 User Manual Glossary R random scanning relay RMA rms RTD scan SCANADVD scan list scanner advanced trigger SCXI sensor settling time SCXI 1127 1128 User Manual scanning the channels in a mux in any order a switch that connects or disconnects the signal to a common through the physical movement of a metal arm Return Material Authorization root mean square the sq
45. Manual Appendix D SCXI 1127 1128 Front Connector SCXI 1127 1128 User Manual Pin Signal Column Signal Number Name A B C Name 32 GBA 1 cups 31 b GHA 30 CH5A o b 29 cHsa Lo do o Oe 28 o ot then 27 CH8A o 4 51 CHA 26 CH11A o 4 oE CHA 25 CHiiA o b ot Hon 24 CH14A 4o b l pus 23 CH14A o b ot Gham 22 d o 21 OHiB E ol Ghob 20 CH4B o b uL pb 19 CH4B i CHB 18 4 b oD Chem 17 cH7B 4o ol 16 CH10B ce chab 15 CH10B 4o 14 5 eg 13 CH13B 6 ob 12 OUTOAt o 6 o C GHI4B 11 OUTOA 4o 5 o GHIBB 10 OUTIB o o oHa 9 ouTiB b o OUTOB 8 cus o Fot gs 7 45V 150 o oE 15V 50 HVAB EN 6 ss owl Ne 5 NG 6 ot 4 cba dol Ne 3 5 V Non Isolated e 6 co GND Non Isolated 2 GND Non Isolated 6 GND Non Isolated 1 SCANADVD o ol GND Wonsolated Figure D 3 SCXI 1127 1128 Front Connector Pin Assignments for 4 Wire Mode D 4 ni com National Instruments Corporation Appendix D SCXI 1127 1128 Front Connector Pin Signal Column Signal Number Name A B C Name co 32 2 b o CO C1 31 C2 o 1 C3 30 5
46. NITORING OR CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Compliance FCC Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission FCC has rules t
47. SCXI 1127 1128 into an SCXI Chassis 1 4 Figure 1 2 4 Slot Single Chassis Installation ee 1 6 Figure 1 3 4 Slot Configuration Parts Locator Diagram 1 7 Figure 1 4 12 Slot Single Chassis Installation eee 1 8 Figure 1 5 12 Slot Configuration Parts Locator Diagram 1 9 Figure 1 6 4 Slot to 4 Slot Multichassis Configuration Parts Locator DUETU CHEERS 1 11 Figure 1 7 4 Slot to 12 Slot Multichassis Configuration Parts Locator Diagram on ee eor reta epson 1 13 Figure 1 8 12 Slot to 12 Slot Multichassis Configuration Parts Locator DLA BT AMM eos fess esses eae 1 15 Figure 1 9 Installing the SCXI 1127 1128 with Two DAQ Devices 1 19 Figure 2 1 SCXI 1331 Signal Connections eene 2 2 Figure 2 2 2 Wire Block Diagram eene 2 3 Figure 2 3 2 Wire Wiring Diagram n tte tete tee eate tees 2 4 Figure 2 4 1 Wire Block Diagram eese 2 5 Figure 2 5 Wire Wiring Diagram nonet eret tren 2 6 Figure 2 6 4 Wire Block Diagram 0 0 elec cece ceeeeseeeeeeseeeeeeeecaeenseeaeenseeaeenaes 2 7 Figure 2 7 4 Wire Wiring Diagram esee eere eene rennen 2 8 Figure 2 8 Signal Connections for 2 Wire Resistance Measurement
48. SCXI 1128 A 5 pin assignments See front connector PXI 1010 chassis connecting with SCXI 1127 1128 1 16 to 1 17 DMM in PXI slot 8 1 17 DMM in PXI slots 1 through 7 1 16 to 1 17 using DAQ device 1 20 PXI 1011 chassis connecting with SCXI 1127 1128 1 17 to 1 18 DMM in PXI slot 4 1 18 using DAQ device 1 20 Q questions about SCXI 1127 1128 E 1 to E 3 R R 0 3 signal table D 6 RTD measurements 2 19 5 safety information 1 24 to 1 25 safety specifications SCXI 1127 A 3 SCXI 1128 A 3 to A 6 ni com SCANADVD signal description table D 6 handshaking scanning 2 15 to 2 16 hardware timed scanning 2 12 scanner operation See multiplexer scanner operation SCXI chassis installing SCXI 1127 1128 into See installation SCXI 1127 1128 See also specifications accessories B 1 to B 2 common questions E 1 to E 3 customizing C 1 to C 2 front connector D 1 to D 6 overview 1 1 to 1 2 SCXI 1331 terminal block 1 wire channel scanning configuration 2 5 to 2 6 2 wire channel scanning configuration 2 4 4 wire channel scanning configuration 2 6 to 2 9 multiplexer scanner operation 2 2 to 2 3 overview B 1 signal connections figure 2 2 SCXI 1332 terminal block 4x8 matrix configuration 2 21 to 2 24 matrix expansion 2 24 to 2 28 overview B 1 self test See configuration and self test single chassis system installing See installation software installation 1 2 to 1 3 software scanning 2 11
49. SCXT SCXI 1127 1128 User Manual NATIONAL ber 2000 Editi INSTRUMENTS Part Number 322149B 01 Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 794 0100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Calgary 403 274 9391 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 New Zealand 09 914 0488 Norway 32 27 73 00 Poland 0 22 528 94 06 Portugal 351 1 726 9011 Singapore 2265886 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2528 7227 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubseni com Copyright 1999 2000 National Instruments Corporation All rights reserved Important Information Warranty The SCXI 1127 and SCXI 1128 are warranted against defects in materials and workmanship for a period of one year from the date of shipment as evid
50. and Interfaces by clicking the next to the Devices and Interfaces icon 1 22 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 You will see the chassis selected in the list Display the list of modules in the chassis by clicking the next to the Chassis icon Right click the module you want to configure and select Properties You will be presented with tabs containing attributes for different properties of the module You can select any tab to see and or change any attributes Note For the SCXI 1127 1128 the second tab is for configuring the wire modes for each channel At the end of the pop up list of channels you can select multiple channels Manually Adding Modules If you chose to not auto detect your SCXI modules you must add each of your modules separately 1 2 Click Finish in the Chassis Configuration window Display the list of Devices and Interfaces by clicking the next to the Devices and Interfaces icon You will see the chassis you selected in the list Display the list of modules in the chassis by clicking the next to the Chassis icon Right click the slot that is cabled to your device and select Insert For DAQ devices this is the slot cabled to the DAQ device For DMMs this is typically slot 4 on a 4 slot chassis and slot 12 on a 12 slot chassis Select the module that is intended for that slot and click Next You are now given the option to make this the module that controls th
51. asonable control Copyright Under the copyright 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 M IVI LabVIEW Measurement Studio National Instruments ni com M NI VISA PXI SCXI and VirtualBench are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MO
52. ation 9 7s ABO AB2 7s AB2 6 1 8 Slot HVAB Backplane Adapter 5 1 Slot HVAB Backplane Adapter 9 HV8 HV8 Cable 2 HV8 BAN4 Cable 6 NI 4060 for PCI 10 12 Slot SCXI Chassis 8 Position HVAB Plug 7 SH9MD 9MD Cable 11 SH9MD 9MD Cable 4 2 Slot HVAB Backplane Adapter 8 12 Slot SCXI Chassis Figure 1 8 12 Slot to 12 Slot Multichassis Configuration Parts Locator Diagram 1 Install the HVAB backplane adapters and jumper blocks in the 12 slot chassis as described in steps 1 through 3 in Single 12 Slot Chassis Configuration 2 Connect the HV8 HV8 cable from the first chassis normally the connector behind slot 1 to the HVAB connector behind slot 12 of the next chassis 3 Connect the SH9MD 9MD cable from the AUX OUT connector of the first chassis to the AUX IN connector behind slot 5 of the next chassis 4 Repeat steps 1 through 3 for each additional chassis National Instruments Corporation 1 15 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 B Notes Do not connect the SH9MD 9MD cable to the 2 slot HVAB backplane adapter An SCXI 1127 1128 is required in slot 12 of each 12 slot chassis to establis
53. ction compensation contact bounce D DC debounced device digital multimeter DMA DMM drivers driver software E external trigger SCXI 1127 1128 User Manual Celsius 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 sensor a method of compensating for inaccuracies in thermocouple circuits the intermittent switching that occurs when the movable metal parts of a relay make or break contact direct current indicates when the contact bounce has ended See contact bounce 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 amultifunction meter used to make measurements such as voltage current resistance frequency temperature and so on direct memory access a method by which data can 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 See digital multimeter software that controls a specific hardware device such as a switch card a voltage pulse from an external source that triggers an event such as A D conversion G 2 ni com H handshaking hardware timed scanning HVAB Hz in
54. d by channel cost and required accuracy The 4 wire configuration is ideal and provides National Instruments Corporation 2 19 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 the best accuracy while 1 wire provides the maximum channel count Use the 4 wire configuration to eliminate the effects of lead resistance on the measurement Since the lead resistance is typically small when compared with the thermistor range the impact of the lead resistance error is smaller than you have in an RTD measurement See the 4 Wire versus 2 Wire Resistance Measurement section for more information Operating as a Matrix A matrix is one of the most flexible switching configurations Unlike a multiplexer a matrix can connect multiple inputs to multiple outputs A multiplexer is typically organized into channels and commons while a matrix is organized into columns and rows You can connect any column to any number of rows and any row to any number of columns Figure 2 17 shows an example of a 2 x 4 1 wire matrix configuration At each intersection of a row and column there is a switch When the switch is closed the row is connected to the column Figure 2 17 depicts a 1 wire matrix the SCXI 1127 1128 is a 2 wire matrix The switching method for a 2 wire matrix remains the same 2 wire matrix is shown in Figure 2 21 Matrices are useful in applications where maximum switching flexibility is desired Col1 Col2 Col3 Col4
55. e chassis Select the DAQ device or DMM you cabled to the chassis using the Connected to control Confirm that there is a check in the checkbox labeled This device will control the chassis and click Next You are presented with a series of properties for the module Select the appropriate values for the attributes and click Next After making your selections click Finish iyi Note For the SCXI 1127 1128 the second tab is for configuring the wire modes for each channel At the end of the pop up list of channels you can select multiple channels You are now finished configuring the slot Configure the rest of your modules in the same manner National Instruments Corporation 1 23 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 To remove a module or chassis right click the chassis or module you want to remove and select Delete To test the chassis configuration right click the chassis and select Test Safety Information The following cautions contain important safety information concerning hazardous voltages J Cautions You must insulate all of your signal connections appropriately to the highest available voltage with which the SCXI 1127 1128 may come in contact Any voltage connected to the SCXI 1127 1128 connector may appear on any other pin of this connector Equipment described in this document must be used in an Installation Category II or lower environment per IEC 60664 Do
56. e System Integration section of ni com National Instruments Corporation F 1 SCXI 1127 1128 User Manual Appendix F Technical Support Resources Worldwide Support National Instruments has offices located around the world to help address your support needs You can access our branch office Web sites from the Worldwide Offices section of ni com Branch office Web sites provide up to date contact information support phone numbers e mail addresses and current events If you have searched the technical support resources on our Web site and still cannot find the answers you need contact your local office or National Instruments corporate Phone numbers for our worldwide offices are listed at the front of this manual SCXI 1127 1128 User Manual F 2 ni com Glossary Prefix Meanings Value n nano 10 9 u micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 10 Symbols x degrees Q ohms percent plus or minus AC ADE ANSI bus amperes alternating current application development environment American National Standards Institute 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 National Instruments Corporation G 1 SCXI 1127 1128 User Manual Glossary C C channel CJS cold jun
57. e module into the module guides and push it to the back of the slot until the connectors make good contact The module must be firmly engaged however do not force the module into place SCXI 1127 1128 User Manual 1 4 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 5 Note When installing the SCXI 1127 1128 module in an SCXI chassis the rightmost slot when the chassis is viewed from the front must be filled first then fill the slot to the left with the next SCXI 1127 1128 Other SCXI modules can be loaded from left to right 4 Insert any other SCXI modules into the remaining slots in the same manner as described in step 3 5 Secure all the SCXI 1127 1128 modules to the SCXI chassis using both thumbscrews To finish installing your SCXI 1127 1128 follow one of the procedures in the appropriate section that follows Connecting the SCXI 1127 1128 to the DMM in a Single Chassis System You need the following items for this installation e SCXI 1000 1000DC 1001 chassis with the SCXI 1127 1128 modules installed e SCXI 1357 4 slot 1358 12 slot kit 1 slot 2 slot and or 8 slot HVAB backplane adapter HV8 to BAN4 cable SH9MD 9MD cable Two or three 8 position high voltage plugs e DMM 1 8 in flathead screwdriver Consult your SCXI chassis documentation and DMM documentation for additional instructions and warnings Your SCXI 1127 1128 modules and any other SCXI modules should already be
58. ed 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 SCANADVD 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 63 gt 1 wire Input Output Channels Where signals are connected to the CH lt 0 31 gt 2 wire switch card CHx and CHx are switched CH lt 0 15 gt A together 4 wire excitation CH lt 0 15 gt B 4 wire sense OUTO Input Output Common The common for each bank OUT lt 0 3 gt 2 wire OUT lt 0 1 gt A 4 wire excitation OUT lt 0 1 gt B 4 wire sense C lt 0 7 gt Input Output Columns Where signal are connected to the switch card The card behaves as a matrix when proper external wiring is added R lt 0 3 gt Input Output Rows Where signals are connected to the switch card In matrix configuration any row can be connected to any column SCXI 1127 1128 User Manual D 6 ni com Common Questions This appendix addresses common questions you may have while using your SCXI 1127 1128 module How fast can I scan with the SCXI 1127 1128 module The fastest scan rate for the SCXI 1127 15 100 scans s and the fastest scan rate for the SCXI 1128 is 1000 scans s Typically when using a DMM to make accurate measurements the DMM requires hundreds of milliseconds Consequently the DMM becomes the limiting
59. enced by receipts or other documentation National 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 document 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 Instrumen
60. ettled before taking the next measurement The second type of scanning software scanning is a method by which channels are selected through the software This method requires no trigger connections Software scanning does not offer the time accuracy of hardware timed scanning Hardware Timed Scanning In hardware timed scanning the software downloads to the SCXI 1127 1128 a list of channels to scan including each channels configuration information such as whether the channel is 2 wire 1 wire or 4 wire The software then arms the SCXI 1127 Once armed the SCXI 1127 1128 advances to the next channel when it receives a trigger from the DMM In multi module scanning the chassis arbitrates between modules Each module in turn drives its output onto the analog bus and on the OUT COM terminals Figure 2 11 shows the hardware scanning flowchart and may be useful in understanding the scanning triggering operation of the SCXI 1127 1128 SCXI 1127 1128 User Manual 2 12 ni com Chapter 2 Reset y The channel scan list is downloaded to SCXI 1127 1128 y The first channel in the scan list is selected y The SCXI 1127 1128 is now armed to respond to triggers on EXT_TRIG_IN y Stay at the selected channel the scan list EXT_TRIG_IN pulsed Is the SCXI 1127 1128 armed A Return to the top of the scan list and select the first channel in the list
61. f or 31 SCXI 1127 25 s D0000000000000000000000000000000 150 Noni1 vivos o ol 69 2 D0000000000000000000000000000000 oj 1 is vw 0 ve 2 QA JO 269 o 000000 ooooooooooooooooooooooooooooooo ol ol ol SCXI 1127 1128 User Manual er Ho Ave amp 5 1842688 01 gt Figure 2 7 4 Wire Wiring Diagram On power up the ABO and AB2 switches are open disconnecting the SCXI 1127 1128 from the high voltage bus If you are using this module with a high voltage backplane you need to close the ABO and AB2 switches to connect the EXCITATION and SENSE commons to the HVAB backplane Figure 2 7 shows an example of a 4 wire configuration using the SCXI 1331 terminal block The diagram shows the 4 wire terminal block connections for channels 1 and 12 Resistance is measured on both channels Each channel has excitation pair positive and negative terminals labeled 1A and 12A and SENSE terminals labeled 1B and 12B respectively R1 is excited through the 12A positive and negative screw terminals and the voltage drop across the resistor is measured through the 12B positive and
62. from the AUX OUT connector of the first chassis to the AUX IN connector behind slot 5 of the next chassis 4 Repeat steps 1 through 3 for each additional chassis Notes Do not use the SH9MD 9MD cable behind slot 4 of the 2 slot HVAB backplane adapter on the 12 slot chassis An SCXI 1127 1128 is required in slot 4 of the 4 slot chassis and slot 12 of the 12 slot chassis to establish communications with all the chassis in the system If slot 4 is empty in the 4 slot chassis or slot 12 is empty in the 12 slot chassis the chassis will not operate It is this module that you must specify in MAX as the module cabled to the DMM If the 4 slot chassis is configured with less than four slots of the HVAB backplane adapter use the right most available HVAB connector to extend to the next chassis In this instance right most means the slot closest to slot 1 when the chassis is viewed from the back 12 Slot and 12 Slot Multichassis Configuration In addition to the items needed for a single chassis system you need the following items to install this configuration e SCXI 1358 multichassis expansion kit HV8 HV8 cable SH9MD 9MD cable Three 8 position HVAB plugs One 8 slot HVAB backplane adapter One2 slot HVAB backplane adapter Two 1 slot HVAB backplane adapters SCXI 1127 1128 User Manual 1 14 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 Refer to Figure 1 8 to set up this multichassis configur
63. ge and to measure the load resistors A simple test can consist of first measuring the values of the resistances while they are not connected to the power supply and then monitoring the output voltage as different resistors are connected Figure 2 21 shows a schematic of this application gt 00000 00000 e amp COLUMN EXPANSION 55 3 f 5 ROW EXPANSION V Load 00000 nestos SEE o SCXI 1127 Ixps amp 7 ROW EXPANSION o Be E 58 E 5 M o8 x 2 E X COLUMN EXPANSION V c 00000 00000 00000 00000 Figure 2 20 SCXI 1332 Connected to an SCXI 1127 National Instruments Corporation 2 23 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 Load Resistors Power H H Mii cmn e 9 O ro J r1 r2 2 r3 cO c1 c2 c3 c4 5 7 Matrix Expansion SCXI 1127 1128 User Manual Figure 2 21 SCXI 1332 Connected to an SCXI 1127 1128 Schematic You can build matrices larger than 4 x 8 by using multiple SCX
64. h communications with all the chassis in the system If slot 12 is empty the chassis will not operate It is this module that you must specify in MAX as the module cabled to the DMM If a chassis is configured with less than 12 slots of the HVAB backplane adapter use the right most available HVAB connector to extend to the next chassis In this instance right most means the slot closest to slot 1 when the chassis is viewed from the back Connecting the SCXI 1127 1128 to the DMM in a PXI 1010 Chassis You need the following items to complete the installation SCXI 1127 1128 User Manual PXI chassis with the SCXI 1127 1128 modules installed SCXI 1357 kit Two 1 slot HVAB backplane adapters 2 slot HVAB backplane adapter 8 to cable Two 8 position HVAB plugs SH9MD 9MD cable DMM 1 8 in flathead screwdriver Consult your PXI 1010 and DMM documentation for additional instructions and warnings Your SCXI 1127 1128 modules and any other SCXI modules should already be installed in the chassis according to their installation instructions Before you proceed with your connections make sure you turn off your SCXI chassis DMM in PXI Slots 1 through 7 Configuration To install your DMM in PXI slots 1 through 7 follow these steps 1 2 Install your DMM in any one of the PXI slots 1 through 7 In the SCXI subsystem install the 2 slot HVAB backplane adapter behind SCXI slots 3 and 4 Install
65. he connection On power up switch ABO is open disconnecting the SCXI 1127 1128 from the high voltage bus If you are using the module with a high voltage backplane you need to close the ABO switch to connect the multiplexer output to the HVAB backplane You can do this through NI SWITCH Figure 2 5 shows an example of a 1 wire configuration using the SCXI 1331 terminal block The diagram shows the 1 wire terminal block connections for channels 4 24 and 59 Channel 4 is measuring a resistance The positive channel is labeled 4 while the negative terminal common reference is labeled 1 WIRE LO REF National Instruments Corporation 2 5 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 Multiplexer lt er ZR T o 8 Output lt 7 OUTO b 3 af of sa 5 or b GIN SCXI 1127 95 s 269 o A Doooooooooooooooooooooooooooo 00000000000000000000000000000 H0000000000000000000000000000 0 0 9 AQAYNYO NIL 1X3 vr Of Hoo S 0 lex go 5 AS el 00000
66. he software is scanned by selecting the desired channel on the SCXI 1127 1128 and making the required measurement Refer to the NI SWITCH documentation for more information on software scanning Making Temperature Measurements You can use the SCXI 1127 1128 to measure a variety of temperature devices including thermocouples RTDs and thermistors The following sections discuss how to use these types of sensors with the SCXI 1127 1128 Making Thermocouple Measurements Figure 2 16 shows a thermocouple V connected to channel 3 on the SCXI 1331 terminal block The thermocouple is connected in the 2 wire configuration Due to the small voltages that thermocouples produce National Instruments recommends that you connect them in a 2 wire differential configuration versus a 1 wire configuration National Instruments Corporation 2 17 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 Thermocouple Thermistor 90 7 BOXI 1331 5 2 2 go En o o SOs Osos IM Lo o 2 9 ooo 9 SA gz 999 BE see 29 zg R2 ooo SCXI 1127 1128 2
67. igure 2 12 Cabling a DMM and Using the TRIGO to Bus the VMC EXT TRIG IN to Non Cabled Modules Hardware Timed Scanning Using External Instruments When using the SCXI 1127 1128 with an external measurement instrument you can use either synchronous or handshaking mode to advance the SCXI 1127 1128 Synchronous Scanning In the synchronous scanning mode the measuring device such as a DMM issues a trigger voltmeter complete VMC to advance the multiplexer at regular intervals Each interval must be at least 10 ms to guarantee that the switch has fully settled before the next measurement is taken For example you can connect the VMC of your DMM to the SCXI 1127 1128 via a screw terminal labeled EXT TRIG IN external trigger input on the SCXI 1331 terminal block 2 14 ni com Chapter 2 Using the SCXI 1127 1128 The module to which you connected your external DMM trigger signals is referred to as the cabled module If you add additional SCXI 1127 1128 modules to your system it is not necessary to cable the VMC signal to each module You can bus the VMC signal onto the SCXI backplane Trig 0 allowing other modules to be triggered as shown in Figure 2 13 These additional modules are referred to as non cabled modules because they do not require the VMC to be connected directly to them EXT_TRIG_IN From DMM VMC Cabled SCXI 1127 1128 SCXI Module SCX
68. in this chapter 1 Connect MIO DIO cable adapter to the rear of a module that is not the SCXI 1127 1128 module Secure the adapter to the SCXI chassis using the screws provided 2 Attach your DAQ cable to the cable adapter at the rear connector National Instruments Corporation 1 19 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 4 5 6 Attach the other end of the DAQ cable to the National Instruments DAQ device Check the installation Turn on the SCXI chassis Turn on the computer or reconnect it to your chassis If you already have the appropriate software installed you are ready to configure the SCXI 1127 1128 via an SCXI module other than the SCXI 1127 1128 module Using a DAQ Device on a 1010 Chassis You should have already installed the SCXI 1128 modules and their HVAB backplane adapters 1 2 Turn off the power to the PXI and SCXI chassis Install your DAQ device in PXI slot 8 Installation in this slot allows the DAQ device to directly control the SCXI 1128 without the need for additional cabling Turn on the power to both the PXI and SCXI chassis Using a DAQ Device on a 1011 Chassis You should have already installed the SCXI 1128 modules and their HVAB backplane adapters 1 2 Turn off the power to the PXI and SCXI chassis Install your DAQ device in PXI slot 4 Installation in this slot allows the DAQ device to directly control
69. ing Help Help Topics 1 MAX by double clicking the icon on your desktop 2 To add a new chassis right click Devices and Interfaces and select Create New Select the appropriate chassis from the list box and click Finish 3 Configure the chassis by selecting the Chassis ID The chassis ID is an arbitrary number that you choose for use by the software to uniquely specify the chassis 4 Select the Chassis Address refer to your SCXI Chassis User Manual for further information For the SCXI 2000 you also need to select the Baud Rate and COM Port You now have the choice of auto detecting your modules or manually adding them depending on your application If you are using an MIO or DIO DAQ device you can either auto detect or manually add the modules If you are using a DMM you must manually add the modules Auto Detecting Modules SCXI 1127 1128 User Manual If you selected auto detect and the chassis is not an SCXI 2000 remote chassis you must have your chassis connected to your DAQ device 1 Click Next 2 Select your communication path except in the case of the SCXI 2000 and click Next 3 Select the module cabled to your communication path except in the case of the SCXI 2000 and click Finish Your SCXI chassis and SCXI 1127 1128 modules are now configured in the software with your modules To configure the properties for a particular module perform the following steps 1 Display the list of Devices
70. installed in the chassis according to their installation instructions Before you proceed with your connections make sure you turn off your SCXI chassis National Instruments Corporation 1 5 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 Single 4 Slot Chassis Configuration Refer to Figures 1 2 and 1 3 to make connections in the single 4 slot chassis configuration 1 SCXI 1127 1128 Module 4 1 Slot HVAB Backplane 6 NI 4060 for PCI 2 4 Slot SCXI Chassis Adapter 7 SH9MD 9MD Cable 3 2 Slot HVAB Backplane 5 8 Position HVAB Plug 8 HV8 BAN4 Cable Adapter Figure 1 2 4 Slot Single Chassis Installation SCXI 1127 1128 User Manual 1 6 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 J LL LL w 1 2 Slot HVAB Backplane Adapter 2 8 Position HVAB Plug 3 1 Slot HVAB Backplane 5 NI 4060 for PCI Adapter 6 SH9MD 9MD Cable 4 HV8 BAN4 Cable 7 4 Slot SCXI Chassis Figure 1 3 4 Slot Configuration Parts Locator Diagram Install the 2 slot HVAB backplane adapter behind slots 3 and 4 Install additional 1 slot HVAB backplane adapters behind slots 1 and 2 if
71. io frequency energy and if not installed and used in strict accordance with the instructions in this manual and the CE Mark Declaration of Conformity 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 FOR HOME OR OFFICE USE Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FCC Rules Class A 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 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 glemen
72. is appendix lists the specifications for the SCXI 1127 1128 modules These specifications are typical at 25 C unless otherwise noted SCXI 1127 Input Characteristics Number of relays available as channels eet rte 32 Common mode voltage Channel to channel 300 or DC Channel to earth 300 Vms or DC Maximum allowed voltage differential mode or single ended Maximum switching capacity differential mode or single ended HER 1 Aat 30 VDC P CEP NE E 200 mA at 250 V 0 5 A at 125 Vins rms Maximum switching power per differential channel or single ended 60 VA 30W Contact on resistance initial 100 mQ Contact material sess Gold clad silver alloy Transfer Characteristics Thermal EMF differential lt 3 Maximum frequency bandwidth 50 Q termination Worst case channel 10 MHz National Instruments Corporation A 1 SCXI 1127 1128 User Manual Appendix A Specifications for SCXI 1127 Channel to channel crosstalk 50 Q termination lt 70 dB TOO tree lt 57 79 dB D MUA 22 zi lt 53 31 dB 5 2 eee each ec etd 41 47 dB LT2MHI cette lt 27 23 dB Dynamic Characteristics Maximum operating speed 100 cycles s Relay operate time at 20 90
73. l block or cable it is important that you incorporate the safety interlock scheme into the terminal block cable You do this by connecting the 5 V ISO HVAB EN signal to the 5 V ISO signal These signals are shown in the following figures Refer to Table D 1 for descriptions of signal names National Instruments Corporation D 1 SCXI 1127 1128 User Manual Appendix D SCXI 1127 1128 Front Connector SCXI 1127 1128 User Manual Pin Signal Column Signal Number Name A B C Name 32 Chae s I mL cups 31 Chas o b ede 30 pue Ls Sot 29 o Fot 28 o Pos B 27 DES bs Du un 26 1 I xL 25 CH11 b 24 Ghir Ge 23 CH14 b ACE 22 CH17 o 21 Chi cee S xD chie 20 ee S E ems 19 4o d ol cms 18 CH234 17 La S uL dem 16 Ghee ae do x OE 15 o S ack Gen 14 CH29 o b ot 13 CH29 o ot GR 12 oe ot Gham 11 OUTO Le b oT Gir 10 o b ol OUT 9 OUT3 o L 8 cusso 4o Te aso 7 45V 150 o 5 1 tev ASO HVAB EN 6 NC o b of ne 5 NC o of ne 4 NC o I e ne 3 5 V Non Isolated o 4 cr GND Non Isolated 2 GND Non Isolated 6 GND Non Isolated 1 SCANADVD o ol GND Figure D 1 SCXI 1127 1128 Front Connector Pin Assignments for 2 Wire Mode D 2 ni com Appendix D SCXI 1127 1128 Front Connec
74. mplete backplane There may be instances where it is necessary for a non SCXI 1127 1128 module to communicate to a device using a different backplane adapter For example using a separate digital module in parallel mode In this case you can remove that segment of the HVAB although it is important that you do not remove the section of the HVAB that is controlling the chassis Can I use the HVAB for matrix expansion Yes You can use the HVAB backplane to connect the matrix rows together For example you can create a 8 x 16 matrix in a 4 slot chassis First install four SCXI 1127 1128s into the chassis Now you have four independent 4 x 8 matrices Now if you install the 2 slot HVAB backplane adapter E 2 ni com Appendix E Common Questions behind slots 3 and 4 you have connected the rows between slot 3 and 4 which creates a 4 x 16 matrix Now install the two 1 slot adapters behind slots 1 and 2 Connect the two 1 slot adapters together with an 8 position HVAB plug Do not connect the 2 slot HVAB backplane adapter to the 1 slot adapters as this would create a 4 x 32 matrix You now have created two independent 4 x 16 matrices Finally to create a 8 x 16 matrix you must connect the 16 columns of each 4 x 16 matrix through the SCXI 1332 terminal block by using either matrix expansion cables or by wiring the terminal blocks by hand National Instruments Corporation 3 SCXI 1127 1128 User Manual Technical Support Resources Web Su
75. nal block thermistor thermocouple trigger TTL V V VDC VI VMC National Instruments Corporation G 5 Glossary a graphical program included with NI SWITCH that you can use to interactively control the switch a method by which channels are selected through the software hardware timed scanning uses one triggering signal to advance the multiplexer to the next channel in the scan Terminal Block eXtension an accessory containing wire connection points typically screw terminals a semiconductor sensor that exhibits a repeatable change in electrical resistance as a function of temperature Most thermistors exhibit a negative temperature coefficient a temperature sensor created by joining two dissimilar metals The junction produces a small voltage as a function of the temperature any event that causes or starts some form of data capture Transistor Transistor Logic volts volts direct current 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 voltmeter complete signal during synchronous or handshake scanning with an external DMM this signal advances the switching module to the next channel It is called External Trigger In EXT_TRIG_IN on the SCXI 1331 terminal block SCXI 1127
76. needed Install the 8 position HVAB plugs to connect the HVAB backplane adapters as needed Connect the HV8 BAN4 cable from the DMM to the HVAB connector behind slot 4 Connect the SHOMD 9MD cable from the DMM to the AUX IN connector You can install any additional SCXI 1127 1128 modules in any slot that has an HVAB backplane adapter behind it Note SCXI 1127 1128 is required in slot 4 to establish communication with the chassis If slot 4 is empty the system will not operate It is this module that you must specify in Measurement amp Automation Explorer MAX as the module cabled to the DMM National Instruments Corporation 1 7 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 Single 12 Slot Chassis Configuration Refer to Figures 1 4 and 1 5 to make connections in the single 12 slot chassis configuration 1 SCXI 1127 1128 Module 4 1 Slot HVAB Backplane 7 SH9MD 9MD Cable 2 12 Slot SCXI Chassis Adapter 8 HV8 BAN4 Cable 3 2 Slot HVAB Backplane 5 8 Position HVAB Plug 9 8 Slot HVAB Backplane Adapter Adapter 6 NI 4060 for PCI Figure 1 4 12 Slot Single Chassis Installation SCXI 1127 1128 User Manual 1 8 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 99 ABO ABO 25 AB2 AB2
77. not operate the module in an explosive atmosphere or where there may be flammable gases or fumes SHOCK HAZARD This unit should only be opened by qualified personnel aware of the dangers involved Disconnect all power before removing the cover Always install the grounding screw If signal wires are connected to the module or terminal block dangerous voltages may exist even when the equipment is turned off Before you remove any installed terminal block or module disconnect the AC power line or any high voltage sources 2 30 V4 and 42 4 V peak or 60 VDC that may be connected to any terminal block or module Do not operate damaged equipment The safety protection features built into this module can be impaired if the module becomes damaged in any way If it is damaged turn the module off and do not use it until service trained personnel can check its safety If necessary return the module to National Instruments for service and repair to ensure that its safety is not compromised Clean the module and accessories by brushing off light dust with a soft non metallic brush Remove other contaminants with a stiff non metallic brush The unit must be completely dry and free from contaminants before returning it to service The module must be used in UL listed SCXI chassis Do not substitute or modify equipment Because of the danger of introducing additional hazards do not install unauthorized parts or modify the module Return the module
78. o overcome this problem to eliminate the parasitic resistance of the connecting cables a voltmeter uses two sets of cables one for excitation National Instruments Corporation 2 9 SCXI 1127 1128 User Manual Chapter 2 Using the SCXI 1127 1128 current and the other for sensing the voltage developed across the resistor as shown in Figure 2 9 4 Wire Measurement Rp WW lt lex Ve Rp 16 0 p 1 0 WW VsENsE Pi Rp 1 0 WV gt 1 gt VENsE Rp WW i gt lex Figure 2 9 Signal Connections for a 4 Wire Resistance Measurement Since ideally the impedance of the voltmeter is infinite very little or no current passes through the sense leads of the voltmeter As a result the voltmeter reads the exact voltage developed across and no parasitic resistances are introduced into the measurement R R lmeasured Therefore a 4 wire configuration is a more accurate way of performing resistance measurements than a 2 wire configuration Mixed Mode Configuration SCXI 1127 1128 User Manual The input mode of the SCXI 1127 1128 is configurable on a per channel basis therefore you can connect a variety of signal types in 2 wire 1 wire and 4 wire modes to the same module An SCXI 1127 1128 can have 2 wire 1 wire and 4 wire channels connected to its front at the same time as shown in Figure 2 10 2 10 ni com Chapter 2 Using the SCXI 1127 1128
79. o protect wireless communications from interference The FCC places digital electronics into two classes These classes are known as Class A for use in industrial commercial locations only or Class B for use in residential or commercial locations Depending on where it is operated this product could be subject to restrictions in the FCC rules In Canada the Department of Communications DOC of Industry Canada regulates wireless interference in much the same way Digital electronics emit weak signals during normal operation that can affect radio television or other wireless products By examining the product you purchased you can determine the FCC Class and therefore which of the two FCC DOC Warnings apply in the following sections Some products may not be labeled at all for FCC if so the reader should then assume these are Class A devices FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and undesired operation Most of our products are FCC Class A The FCC rules have restrictions regarding the locations where FCC Class A products can be operated FCC Class B products display either a FCC ID code starting with the letters EXN Nan Model Kunder or the FCC Class B compliance mark that appears as shown here on the right FC with FCC Standards Consult the FCC web site http www fcc gov for more information FCC DOC Warnings This equipment generates and uses rad
80. ou can bus the VMC onto the SCXI backplane Trig 0 allowing other modules to be triggered as shown in Figure 2 14 You must daisy chain the SCANADVD trigger from one module to another SCANADVD EXT_TRIG_IN TOBMM From DMM VMC Cabled SCXI 1127 1128 SCXI 1127 1128 SCXI 1127 1128 Y L d a Digital HVAB Ion Communication Connector onnecter Connector Trig O Backplane Figure 2 14 Daisy Chained for Handshaking If you are using an SCXI 2000 chassis you can bus the SCANADVD signal over the SCXI backplane Trig 2 This eliminates the need to physically connect the SCANADVD trigger from one SCXI 1127 1128 module to another This configuration is shown in Figure 2 15 Refer to your SCXI chassis manual to check the Trig 2 specifications EXT TRIG IN SCANADVD From DMM VMC to DMM y t abled SCXI 1127 1128 SCXI Module SCXI Module H E Trig O Backplane y y Trig 2 Backplane Figure 2 15 Connecting an External DMM to an SCXI 1127 1128 in an SCXI 2000 Series Chassis SCXI 1127 1128 User Manual 2 16 ni com Chapter 2 Using the SCXI 1127 1128 Software Scanning Unlike hardware scanning software scanning does not use hardware generated triggers In software scanning a list of channels kept by t
81. plane sections To connect an SCXI 1127 1128 to an external DMM device you need two cables the HV8 BAN4 or BAN2 WIRE cable and a cable to connect the handshaking lines from the SCXI 1127 1128 to the DMM Attach your HV8 BANA cable to the HVAB connector on the HVAB backplane adapter or connect your BAN2 WIRE cable to the OUTO terminals on the SCXI 1331 terminal block When making four wire measurements you must also connect a BAN2 WIRE cable to the OUT2 terminals Attach the other end of the HV8 BAN4 BAN2 WIRE cable to the inputs of your external DMM device Connect the handshaking lines from the front of the SCXI 1331 terminal block to the appropriate lines on the external DMM See Chapter 2 Handshaking Scanning for information on how to use the SCXI 1127 1128 handshaking lines Check the installation Turn on the SCXI chassis Turn on the computer or reconnect it to your chassis The SCXI 1127 1128 module is now installed National Instruments Corporation 1 21 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 B Note For the system to function properly it must be controlled by a DAQ device or NI 4021 switch controller or be a 2000 Series SCXI chassis Configuring and Self Test Run Measurement amp Automation Explorer MAX to configure and test your SCXI 1127 1128 If you need help during the configuration process open the Measurement amp Automation Help file by select
82. plane adapters and 8 position HVAB plugs in the next chassis as described in steps 1 through 3 in Single 4 Slot Chassis Configuration National Instruments Corporation 1 11 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 2 Connect the HV8 HV8 cable from the first chassis normally the connector behind slot 1 to the HVAB connector behind slot 4 of the next chassis 3 Connectthe SHOMD 9MD cable from the AUX OUT connector of the first chassis to the AUX IN connector of the next chassis 4 Repeat steps 1 through 3 for each additional chassis 3 Notes An SCXI 1127 1128 is required in slot 4 to establish communications with the chassis If slot 4 is empty the system will not operate It is this module that you must specify in MAX as the module cabled to the DMM If a chassis is configured with less than four slots of the HVAB backplane adapter use the right most available HVAB connector to extend to the next chassis In this instance right most means the slot closest to slot 1 when the chassis is viewed from the back 4 Slot and 12 Slot Multichassis Configuration In addition to the items needed for a single chassis system you need the following items to install this configuration e SCXI 1358 multichassis expansion kit HV8 HV8 cable SH9MD 9MD cable Three 8 position HVAB plugs One 8 slot HVAB backplane adapter One2 slot HVAB backplane adapter Two 1 slot HVAB backplane
83. pport National Instruments Web support is your first stop for help in solving installation configuration and application problems and questions Online problem solving and diagnostic resources include frequently asked questions knowledge bases product specific troubleshooting wizards manuals drivers software updates and more Web support is available through the Technical Support section of ni NI Developer Zone The NI Developer Zone at ni com zone is the essential resource for building measurement and automation systems At the NI Developer Zone you can easily access the latest example programs system configurators tutorials technical news as well as a community of developers ready to share their own techniques Customer Education National Instruments provides a number of alternatives to satisfy your training needs from self paced tutorials videos and interactive CDs to instructor led hands on courses at locations around the world Visit the Customer Education section of com for online course schedules syllabi training centers and class registration System Integration If you have time constraints limited in house technical resources or other dilemmas you may prefer to employ consulting or system integration services You can rely on the expertise available through our worldwide network of Alliance Program members To find out more about our Alliance system integration solutions visit th
84. pproved at altitudes up to 2000 m Installation Category II Pollution Degree 2 Indoor use only National Instruments Corporation A 3 SCXI 1127 1128 User Manual Appendix A Specifications for SCXI 1128 SCXI 1128 Input Characteristics Number of relays available as channels eo tete 32 Common mode voltage Channel to channel 300 Vim or DC Channel to earth 300 or DC Maximum allowed voltage differential mode or single ended Maximum switching capacity differential mode or single ended DG ists uie tette 30 mA at 10 VDC AQ sd eig deeem 0 8 mA at 250 Maximum switching power per differential channel or single ended 0 3 W Contact on resistance initial 1 2 differential mode Transfer Characteristics Thermal EMF differential 2 Sines ane lt 25 Above 25 onset cmn 100 UV Maximum frequency bandwidth 50 Q termination Worst case channel 1 5 MHz 3 dB point Channel to channel crosstalk 50 Q termination 100 HZ aiitem mt 82 dB lt 74 dB VO KAZ lt 58 dB tert tet lt 38 dB 1 entes lt 20 dB SCXI 1127 1128 User Manual 4 ni com Appendix A Specifications for SCXI 1128 Dynamic Characteristics Maximum operating 1200 cycles s
85. r CD ROM drive 2 Click the Install NI SWITCH option from the installation window that appears automatically 3 Note Ifthe installation window does not appear double click the My Computer icon on your PC desktop Find the CD drive and double click it In the CD directory double click install exe SCXI 1127 1128 User Manual 1 2 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 The NI SWITCH and NI DMM version 1 5 installation window offers three choices e Install NI DMM Choose this selection if you want to install only the software for the DMM Install NI SWITCH Choose this selection if you want to install only the software for the switches e Install NI SWITCH and NI DMM Choose this selection if you want to install the software for both the DMM and the switches 3 install the instrument driver VirtualBench and application development examples choose Programmatic and Interactive Support To install only the instrument driver files for VirtualBench choose Interactive Support Only The Interactive Support Only choice will not allow you to program the instrument with any programming languages 4 When installing NI SWITCH notice the Development Environments panel e Ifyou click the Advanced button on this panel you can custom install National Instruments drivers such as NI DAQ NI IVI and NI VISA e Ifyou do not want to install certain drivers click Advanced and uncheck
86. r PXI 1011 and DMM documentation for additional instructions and warnings Your SCXI 1127 1128 modules and any other SCXI modules should already be installed in the chassis according to their installation instructions Before you proceed with your connections make sure you turn off y our SCXI chassis National Instruments Corporation 1 17 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 DMM in PXI Slots 1 through 3 Configuration To install your DMM in PXI slots 1 through 3 follow these steps 1 2 Install your DMM in any one of the PXI slots 1 through 3 In the SCXI subsystem install the 2 slot HVAB backplane adapter behind SCXI slots 3 and 4 Install additional 1 slot HVAB backplane adapters behind SCXI slots and 2 if needed Install the 8 position HVAB plugs to connect the HVAB backplane adapters as needed Connect the HV8 BANA cable from the DMM to the HVAB connector behind SCXI slot 4 Connect the SHOMD 9MD cable from the DMM to the AUX IN connector You can install any additional SCXI 1127 1128 modules in any slot that has an HVAB backplane adapter behind it DMM in PXI Slot 4 Configuration To install your DMM in slot 4 follow these steps 1 2 Install you DMM in PXI slot 4 Connect the HV8 BAN4 cable from the DMM to the HVAB connector on the front of the PXI 1011 chassis Install any additional SCXI 1127 1128 modules in any SCXI slot B Note The DMM needs to be
87. ram Ar You can connect different types of 2 wire inputs to the SCXI 1127 For example in Figure 2 3 a thermocouple V3 is shown connected to channel 27 and on channel 5 and 24 R3 resistance measurements being made Consult the Making Temperature Measurements section for more information on temperature compensation measurements for making accurate thermocouple measurements SCXI 1127 1128 User Manual 2 4 ni com Chapter 2 Using the SCXI 1127 1128 1 Wire Channel Scanning Configuration The SCXI 1127 1128 has 64 1 wire channels in the multiplexer mode that are available through the SCXI 1331 terminal block Figure 2 4 shows the SCXI 1127 1128 configured as 64 to 1 1 wire multiplexer 1 wire configuration provides a high channel count because all input signals have the same reference This common reference called 1 WIRE LO REF on the SCXI 1127 1128 is available through the screw terminals on the SCXI 1331 terminal block 0 lt Out0 lt 1 WIRE LO REF c r 0 4 14 64 to 1 gt e HVAB Single ended Backplane Multiplexer gt 63 H ABO Switch Figure 2 4 1 Wire Block Diagram The output of the 64 to 1 multiplexer is available through the and OUTO screw terminals on the SCXI 1331 You can also connect the output of the SCXI 1127 1128 to the HVAB backplane using switch ABO to make t
88. ribe how to configure the following multichassis configurations e 4 slot and 4 slot multichassis configuration e 4 slot and 12 slot multichassis configuration e 2 slot and 12 slot multichassis configuration You can also create larger configurations 4 Slot and 4 Slot Multichassis Configuration In addition to the items needed for a single chassis system you need the following to install this configuration e SCXI 1357 multichassis expansion kit HV8 HV8 cable SH9MD 9MD cable Two 8 position HVAB plugs 2 slot HVAB backplane adapter Two 1 slot HVAB backplane adapters 1 10 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 Refer to Figure 1 6 to set up this multichassis configuration J 1 2 Slot HVAB Backplane Adapter 5 NI 4060 for PCI 8 SH9MD 9MD Cable 2 8 Position HVAB Plug 6 SH9MD 9MD Cable 9 HV8 HV8 Cable 3 1 Slot HVAB Backplane Adapter 7 4 Slot SCXI Chassis 10 4 Slot SCXI Chassis 4 HV8 BAN4 Cable Figure 1 6 4 Slot to 4 Slot Multichassis Configuration Parts Locator Diagram 1 Install the HVAB back
89. so operate as a 1 wire 1 x 64 multiplexer enabling you to make a large number of common referenced measurements It can also operate as a 1 x 64 4 wire multiplexer to make resistive measurements such as those needed for thermistors and RTDs With the use of special terminal blocks the SCXI 1127 1128 can become a 4 x 8 or 1 x 32 2 wire matrix A complete list of possible configurations is given in Table 1 1 Table 1 1 SCXI 1127 1128 Configurations Scanning Configuration Multiplexer Matrix 1 wire 1 x 64 N A 2 wire 1 x 32 4 x 8 also 2 x 16 1 x 32 4 wire 1x 16 N A To handle large channel counts you can expand the size of the multiplexer with additional SCXI 1127 1128 modules These modules support the analog bus through a special adapter the high voltage analog bus HVAB backplane adapter in the SCXI 1357 1358 kit at the rear of the module This adapter allows you to expand the HVAB without complicated wiring For example you can connect two SCXI 1127 1128 modules using the HVAB backplane adapter to create a 1 x 64 2 wire multiplexer National Instruments Corporation 1 1 SCXI 1127 1128 User Manual Chapter 1 Installing and Configuring the SCXI 1127 1128 In a matrix configuration you can expand the columns of the matrix using the HVAB backplane adapter For example you can connect two SCXI 1127 1128 modules via the HVAB backplane adapter to create a 4 x 16 matrix You can also expand the rows and
90. t sur le mat riel brouilleur du Canada Class B Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada European Union Compliance to
91. the SCXI 1127 1128 from the high voltage bus If you are using the module with a high voltage backplane you need to close the ABO switch to connect the multiplexer output to the high voltage analog backplane You can do this through NI SWITCH National Instruments Corporation 2 3 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 Figure 2 3 shows an example of a 2 wire configuration using the SCXI 1331 terminal block The diagram shows the 2 wire terminal block connections for channels 2 5 24 and 27 Channel 2 measures a voltage source The positive terminal of channel 2 is labeled 2 with the negative channel labeled 2 The output of the multiplexer is available through the OUTO bus 9 Ma Hoooooooo0c0oo no o oooooooo nooooooooooo dx1 1331 E 5 M zr g 5 ED OUTO e EEA 9 4 go Multiplexer Output EG APIE fol BE 523 Ba ooo V 25 BE 999 5 555 B 298 986 SCXI 1127 269 n NA ooo ooo ooo n 42 e Adwyo o oL Jn o 69 iv ry JO Thermocouple d a 5 Last er hh te z9 os Mz LU a G amp ASSY1842688 01 Figure 2 3 2 Wire Wiring Diag
92. the SCXI 1127 AUXOUT connector You can also use this cable to carry signals to the next chassis Use an HV8 BAN4 cable to connect the HVAB of the SCXI 1127 1128 to the DMM analog bus Use 8 position HVAB plugs to interconnect the HVAB of the HVAB backplane adapters B 1 SCXI 1127 1128 User Manual Appendix Accessories Contact National Instruments for more specific information about these products SCXI 1127 1128 User Manual B 2 ni com Customizing Your Module This appendix describes how to customize your SCXI 1127 1128 module for current loop receiving The SCXI 1127 1128 modules have plated through holes 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 input channel x corresponds to the resistor reference designator RCLx For example the resistor pad for channel 14 is RCL14 UN Caution Before installing the resistors in your module make sure that no signals are connected to your module front connector Before installing your module in the SCXI chassis you must install the resistors by performing the following steps while referring to Figure C 1 Grounding Screw Top of Module Front Connector Figure C 1 Removing the SCX Module Cover National Instruments Corporation C 1 SCXI 1127 1128 User Manual
93. tion hardware timed scanning 2 11 to 2 16 handshake scanning 2 15 to 2 16 overview 2 12 scanning flowchart figure 2 13 synchronous scanning 2 14 to 2 15 using DMM 2 14 using external instruments 2 14 HVAB backplane adapters 1 1 2 3 B 1 independent mode overview 2 29 relay configuration figure 2 30 input characteristics SCXI 1127 A 1 SCXI 1128 A 4 installation 1 3 to 1 25 See also configuration and self test connecting SCXI 1127 1128 to DMM in multichassis system 1 10 to 1 16 4 slot and 4 slot multichassis configuration 1 10 to 1 12 4 slot and 12 slot multichassis configuration 1 12 to 1 14 12 slot and 12 slot multichassis configuration 1 14 to 1 16 connecting SCXI 1127 1128 to DMM in PXI 1010 chassis 1 16 to 1 17 DMM in PXI slot 8 1 17 DMM in PXI slots 1 through 7 1 16 to 1 17 connecting SCXI 1127 1128 to DMM in PXI 1011 chassis 1 17 to 1 18 DMM in PXI slot 4 1 18 ni com connecting SCXI 1127 1128 to DMM in single chassis system 1 5 to 1 9 items required 1 5 single 4 slot chassis configuration 1 6 to 1 7 single 12 slot chassis configuration 1 8 to 1 9 connecting SCXI 1127 1128 to external DMM 1 20 to 1 21 customizing your module C 1 to C 2 bent and trimmed resistor figure C 2 removing SCXI module cover figure C 1 DAQ devices accessing SCXI 1127 1128 using DAQ device 1 18 to 1 20 PXI 1010 chassis 1 20 PXI 1011 chassis 1 20 installing SCXI 1127 1128 into SCXI chassis 1 4 to
94. to SCXI 1127 1128 User Manual 1 24 ni com Chapter 1 Installing and Configuring the SCXI 1127 1128 National Instruments for service and repair to ensure that its safety features are not compromised When using the terminal block with high common mode voltages you must insulate your signal wires appropriately National Instruments is not liable for any damages or injuries resulting from inadequate signal wire insulation Connections including power signals to ground and vice versa that exceed any of the maximum signal ratings on the SCXI 1127 1128 can damage any or all of the modules connected to the SCXI chassis the host computer and the SCXI 1127 1128 module National Instruments is not liable for any damages or injuries resulting from incorrect signal connections If high voltages 2 30 Vims and 42 4 V peak or 60 VDC are present you must connect safety earth ground to the strain relief tab of the terminal block This maintains compliance with UL 3111 and IEC 61010 and protects against electric shock when the terminal block is not connected to the chassis To connect the safety earth ground to the strain relief tab run an earth ground wire in the cable from the signal source to the terminal block National Instruments is not liable for any damages or injuries resulting from inadequate safety earth ground connections Do not loosen or re orient the safety ground solder lug hardware when connecting the safety ground wire to do so
95. tor Pin Signal Column Signal Number Name A B C Name CH32 32 CH2 o o CHO I CH33 31 CH34 o CH1 I CH35 30 CH5 o o CH3 I CH36 29 CH37 o CH4 CH38 28 CH8 o CH6 CH39 27 CH40 o CH7 CH41 26 CH11 o 4 o CH9 CH42 25 CH43 o o CH10 CH44 24 CH14 o CH12 CH45 23 46 o CH47 22 CH17 o oO CHI5 CH48 21 CH49 CH50 20 CH20 o o CH18 CH51 19 CH52 o CH19 CH53 18 CH23 o o CH21 CH54 17 CH55 0 o CH22 CH56 16 CH26 o o CH24 CH57 15 CH58 o CH25 CH59 14 CH29 o CH27 CH60 13 CH61 o CH28 CH62 12 OUTO o CH30 CH63 11 OUTO o o CH31 OUT1 CH40 CH47 10 OUT3 CH24 CH31 o o OUT1 CH8 CH15 OUT2 CH48 CH55 9 OUT3 CH56 CH63 o QUIE CH16 CH23 8 CJS o CJS I 1 WIRE LO REF 7 5 V ISO o o 5 V ISO HVAB EN I NC 6 NC NC NC 5 NC o 4 o NC GND Non Isolated 4 NC GND Non Isolated 3 5 V Non Isolated o NC GND Non Isolated 2 GND Non Isolated o GND Non Isolated I EXT TRIG IN 1 SCANADVD o 4 o GND Non Isolated Figure D 2 SCXI 1127 1128 Front Connector Pin Assignments for 1 Wire Mode National Instruments Corporation D 3 SCXI 1127 1128 User
96. ts if errors are suspected In no event shall National Instruments 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 re
97. uare root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude resistance temperature detector a metallic probe that measures temperature based upon its coefficient of resistivity seconds 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 scanner advance signal in handshake scanning this signal is generated by the switching module to let the instrument or DMM know that the switching module has finished settling at the current channel a list of channels supplied to NI SWITCH that indicates the order in which channels will be scanned 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 Signal Conditioning eXtensions for Instrumentation the National Instruments product line for conditioning low level signals within an external chassis near sensors so only high level signals are sent to DAQ boards in the noisy PC environment a device that responds to a physical stimulus heat light sound pressure motion flow and so on and produces a corresponding electrical signal the amount of time required for a voltage to reach its final value within specified limits G 4 ni com soft front panel software scanning synchronous scanning T TBX termi
98. xer provides the excitation source for the 4 wire channel being scanned The EXCITATION input to the upper multiplexer is available through the OUTO and OUTO screw terminals on the SCXI 1331 The SENSE output from the lower 16 to 1 multiplexer is available through the OUT2 and OUT2 screw terminals on the SCXI 1331 You can also connect the EXCITATION and SENSE commons of the SCXI 1127 1128 to the HVAB backplane Use switches ABO and AB2 to make this connection You can do this through NI SWITCH This is the recommended usage with the DMM Figure 2 7 shows an example of a 4 wire channel configuration of the SCXI 1331 terminal block Channel 6 consists of channel 6A and 6A and 68 and 6B Channel 6A of 4 wire channel 6 is the excitation channel and channel 6B is the voltage sense channel Therefore to make a 4 wire resistance measurement a DMM should excite the current through high voltage ABO or OUTO using channel 6A and sense the voltage across the resistor through AB2 or OUT2 using channel 6B National Instruments Corporation 2 7 SCXI 1127 1128 User Manual 2 Using the SCXI 1127 1128 Sense Output 6A Excitation for Four Wire Channel 6 gt f 6B Sense for Four Wire Channel 6 Iu 4 NZS Excitation Input 2 4 x daror3uM zn ojno ino d 2 lex a

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