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SCXI-1120/D User Manual

1. sss 0 to 50 C Storage temperature sess 20 to 70 C Relative humidity 596 to 9096 noncondensing Module designed to meet IEC 1010 standard for double or reinforced insulation for category II pollution degree 2 National Instruments Corporation A 3 SCXI 1120 D User Manual Appendix A Specifications for SCXI 1120 Safety Designed in accordance with IEC 61010 1 UL3111 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 Pollution Degree 2 SCXI 1120 D User Manual A 4 www natinst com Appendix A Specifications for SCXI 1120D SCXI 1120D Analog Input Input Characteristics Number of channels 8 differential Table A 1 Input Signal Range Channel Bandwidth Gain Range Filter at 22 5 K Filter at 4 5 K 0 5 10 V 225K 4 5K 1 5 V 22 5 K 45K 2 5 2 V 22 5K 45K 5 1 V 22 5 K 4 5K 10 0 5 V 22K 4 5K 25 0 2 V 22K 4 5K 50 0 1 V 22K 4 5K 100 50 mV 20K 45K 250 20 mV 20K 4K 500 10mV 17K 4K 1000 5 mV 14K 3 5K Input coupling eee DC or AC with TBX 1329 or SCXI 1305 Maximum working voltage Signal CMV eene 250 Vms Overvoltage protection 250 Vims on or off National Instruments Corporation A 5 SCXI 1120 D User
2. eene 2 13 Hardware Installation sees enne nee enemies 2 14 Chapter 3 Signal Connections SCXE1120 D Front Connector oer eme eere dansen 3 3 Front Connector Signal Descriptions sees 3 4 Analog Input Channels pn rtr ee e edet tre ee eges 3 5 Temperature Sensor Connection erenrnervnnrvvrvvenvrnvvarvaveravvrreravnrvevernersvennveveee 3 7 SCXI 1120 D Reat ConfectoE hee er tee e o potete cet itis 3 8 National Instruments Corporation V SCXI 1120 D User Manual Contents Rear Connector Signal Descriptions eerrrvrnnvrrerrnnvvrnrrvvvrvervvnrvnnvvnrneevvervrevrarvravsasvseensee 3 9 Analog Output Signal Connections sresnnnvravnnnvrvvnnrnvrnvernnnvrnrnervrarvarnresvenveener 3 10 Chapter 4 Theory of Operation Functional OVetview orte etre tee te rbi ie EEEO ERA EEE EREE RS 4 1 Power Up State inedite eSI EH 4 2 SCXIbus Connector and Digital Interface rrnvrrnnnnrnrnrnrnnevrnvvavvrnrverersvnrversrvevenseveerer 4 3 Digital Control Circuitry seen enne ener enne en nennen nen 4 4 Analog and Timing CICUItry Jet bee ehe eene e ep eire eet 4 5 Analog Input Channels eese rennen 4 6 Analog Output Circuitry eese 4 0 Chapter 5 Calibration Calibration Equipment Requirements sees rennen 5 1 Offset Null Adjust eha heri e npe NT erroe Hei e tete 5 1 Appendix A Specifications Appendix
3. When using multiple chassis cabled to your DAQ device with shielded cables leave jumper W42 and W43 in position on the SCXI 1120 D modules that are connected to the DAQ device In this setting the module drives MISO to SERDATOUT and connects the necessary pullup resistor to the SERDATOUT line All of the shielded adapters buffer and combine the SERDATOUT from each chassis to the DAQ device When using multiple chassis cabled to your DAQ device with ribbon cables leave jumper W43 in position I on all of the SCXI 1120 D modules that are cabled to the DAQ device Set jumper W42 to position I on only one of the SCXI 1120 D modules cabled to the DAQ device All the other SCXI 1120 D modules that are cabled to the DAQ device should have jumper W42 in position 3 If too many pullup resistors are attached to the SERDATOUT line the drivers cannot drive the line low See Table 2 1 for the description and configuration of the jumper settings Using Jumper W44 on Revisions A and B of the SCXI 1120 On Revision A and B SCXI 1120 modules the jumper is in factory default position 1 which connects SLOTOSEL to the SCXIbus INTR line after buffering In this setting the DAQ device controls the SCXIbus INTR line See Chapter 3 Signal Connections for the pin equivalences of the SCXI 1120 rear signal connector and the DAQ device I O connector 3 Note Do not use position 3 It is reserved Using Jumper W44 on Revision C of the SCXI 1120 and All Rev
4. www natinst com Chapter 4 Theory of Operation The analog input consists of eight isolated single ended noninverting amplifiers In addition lowpass filtering is available at the inputs You can jumper select one of two bandwidths 10 kHz or 4 Hz for the SCXI 1120 and 22 5 kHz or 4 5 kHz for the SCXI 1120D The amplifier gain is divided into two stages a first stage providing gains of 1 10 50 and 100 and a second stage providing gains of 1 2 5 10 and 20 Each channel is configurable to a different bandwidth and gain In addition to these two stages the SCXI 1120D has a fixed input gain stage of 0 5 Use the following formula to determine the overall gain of a given amplifier input channel Gro Gist X Gonp for the SCXI 1120 G Gora gt x Gop for the SCXI 1120D where G ta is the overall gain and G and G are the first and second stage gains Here it is important to note that the choice of gain in each stage will affect the amplifier bandwidth To determine the bandwidth of a given gain stage use the following formula GPWP BW TE where BW is a given amplifier stage bandwidth GBWP is the gain bandwidth product typically 800 KHz for the SCXI 1120 and 8 MHz for the SCXI 1120D and G is the gain at this stage This BW might be of concern at high first stage gains such as 50 and 100 In this case the first stage amplifier has a BW equal to 16 kHz and 8 kHz respectively for the SCXI 1120 and 60 kHz and 80 kHz f
5. 10 6 m milli 10 3 k kilo 103 M mega 10 Numbers Symbols B degrees Q ohms 5 V signal A A ABO ABO ABOEN ACH A D AOGND Aims AWG 5 VDC Source signal amperes Positive Analog Bus 0 signal Negative Analog Bus 0 signal Analog Bus 0 Enable bit data acquisition device Analog Input Channel Number analog to digital Analog Output Ground signal amperes root mean square American Wire Gauge National Instruments Corporation G 1 SCXI 1120 D User Manual Glossary BW C C CH CH CHAN CHS CHSGND CJR CLKEN CLKOUTEN CLKSELECT CNT D D A D A DAQD A dB DIG GND DIN DMM SCXI 1120 D User Manual bandwidth Celsius Positive Input Channel Number signal Negative Input Channel Number signal Channel Select bit Chassis bit Chassis Ground signal cold junction reference Clock Enable bit Scan Clock Output Enable bit Scan Clock Select bit Count bit Data Address signal digital to analog Data Acquisition Board Data Address Line signal decibels Digital Ground signal Deutsche Industrie Norme digital multimeter G 2 www natinst com DTEMP DTS F F FIFO FOUTEN FRT G GBWP GUARD hex HSCR HSRS II INTR I O Glossary Direct Temperature Sensor signal direct temperature sensor Fahrenheit first in first out Forced Output Enable bit Forced Retransmit bit gain bandwidth product Guard sig
6. B 1 software related resources B 2 Worldwide technical support B 2 SCXI 1120 D User Manual
7. column C Each input corresponds to a separate amplifier and is fully isolated from the other channels and from earth ground The inputs are designed in a floating single ended configuration thus the measured signal can be referenced to a ground level with common mode voltage up to 250 Vms For better noise immunity connect the negative input channel to the signal reference If the measured signals are floating connect the negative input channel to chassis ground on the terminal block Figure 3 2 shows how to connect a ground referenced signal on the SCXI 1120 D Figure 3 3 shows how to connect a floating signal on the SCXI 1120 D Figures 3 4 through 3 7 show how to connect AC coupled signals on the SCXI 1120 D Figure 3 2 Ground Referenced Signal Connection for the SCXI 1120 D with High Common Mode Voltage Figure 3 3 Floating Signal Connection for the SCXI 1120 D Referenced to Chassis Ground for Better Signal to Noise Ratio National Instruments Corporation 3 5 SCXI 1120 D User Manual Chapter 3 Signal Connections SCXI 1120 D User Manual Str lt Figure 3 5 AC Coupled Signal Connection for the SCXI 1120 with High Common Mode Voltage SCXI 1120 When you connect AC coupled signals to the SCXI 1120 connect an external resistor from the positive input channel to the signal reference to provide the DC path for the po
8. 1120D are warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to 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 subsequ
9. 3 7 floating AC coupled signal connections figure 3 6 SCXI 1120D AC coupled signal connections figure 3 7 description 3 7 floating AC coupled signal connections figure 3 7 O National Instruments Corporation SCXI 1120 D description 3 5 floating signal connections referenced to chassis ground figure 3 5 ground referenced signal connections figure 3 5 analog input specifications SCXI 1120 A 1 to A 4 SCXI 1120 D A 5 to A 7 amplifier characteristics A 6 dynamic characteristics A 6 to A 7 filter A 7 input characteristics A 5 stability A 7 transfer characteristics A 6 analog output circuitry 4 9 to 4 11 diagram 4 9 multiplexed mode 4 10 to 4 11 parallel mode 4 10 analog output signal connections 3 10 to 3 11 AOGND signal table 3 9 C calibration 5 1 to 5 2 equipment requirements 5 1 offset null adjust 5 1 to 5 2 potentiometer reference designators table 5 2 CH7 through CHO signals table 3 4 CH7 through CHO signals table 3 4 CHSGND signal table 3 4 ComponentWorks software 1 3 SCXI 1120 D User Manual Index configuration 2 1 to 2 13 See also installation analog configuration 2 8 to 2 13 direct temperature connection 2 10 gain jumpers 2 10 to 2 12 grounding shielding and reference mode selection 2 8 to 2 9 jumper W41 table 2 10 jumper W46 2 8 to 2 9 SCXI 1120 filter jumpers 2 12 to 2 13 SCXI 1120 D filter jumpers 2 13 digital signal connections 2 4 t
10. CHSGND Chassis Ground Tied to the SCXI chassis C2 DTEMP Direct Temperature Sensor Connects the temperature sensor to pin 18 of the rear signal connector MCH7 when the terminal block is configured for direct temperature connection and jumper W41 is in position 3 A4 5 V 5 VDC Source Powers temperature sensor on the terminal block 0 2 mA of source not protected C4 MTEMP Multiplexed Temperature Sensor Connects temperature sensor to output multiplexer A6 C6 C8 RSVD Reserved Reserved for future use Do not connect any signals to these pins TTL CMOS output They are not protected A8 A10 C10 A16 C16 A22 C22 A28 C28 Not Connected Do not connect any signals to these pins A12 A14 A18 A20 A24 A26 A30 A32 CH7 through CHO Positive Input Channels Positive inputs to channels 7 through 0 respectively C12 C14 C18 C20 C24 C26 C30 C32 CH7 through CH0 Negative Input Channels Negative inputs to channels 7 through 0 respectively SCXI 1120 D User Manual The signals on the front connector are all analog with the exceptions of pins A6 C6 and C8 The analog signals can be divided into two groups the analog input channels and the temperature sensor www natinst com Chapter 3 Signal Connections Analog Input Channels The SCXI 1120 D positive input channels are located in Figure 3 1 column A Their corresponding negative input channels are located in
11. Control signal Scan Control Enable bit Signal Conditioning eXtensions for Instrumentation bus Software Developer s Kit seconds Serial Clock signal Serial Data In signal Serial Data Out signal Slot bit Slot 0 Select signal Serial Peripheral Interface Serial Peripheral Interface Clock signal Slot Select signal temperature coefficient Trigger 0 signal Underwriters Laboratory volts Positive Analog Supply signal Negative Analog Supply signal G 6 www natinst com VDC Vin Vou Vor V ms volts direct current input logic high voltage input logic low voltage output logic high voltage output logic low voltage volts root mean square watts National Instruments Corporation G 7 Glossary SCXI 1120 D User Manual Index Numbers 5V signal table 3 4 A AC coupled signal connections figure SCXI 1120 3 6 SCXI 1120D 3 7 analog and timing circuitry 4 5 to 4 11 analog input block diagram 4 6 analog output circuitry 4 9 to 4 11 formula for gain determination 4 7 analog configuration 2 8 to 2 13 direct temperature connection 2 10 gain jumpers 2 10 to 2 12 grounding shielding and reference mode selection 2 8 to 2 9 jumper W41 table 2 10 jumper W46 2 8 to 2 9 SCXI 1120 filter jumpers 2 12 to 2 13 SCXI 1120 D filter jumpers 2 13 analog input channels 3 5 to 3 7 analog input block diagram 4 6 SCXI 1120 AC coupled signal connections figure 3 6 description 3 6 to
12. INTR SLOTOSEL DIO2 PB6 DOUT6 SPICLK SERCLK EXTSTROBE PB7 DOUT7 MISO SERDATOUT DIO4 PCI DIN6 Specifications and ratings for the digital I O lines are given in Appendix A Specifications National Instruments Corporation SCXI 1120 D User Manual Theory of Operation This chapter contains a functional overview of the SCXI 1120 D module and explains the operation of each functional unit making up the SCXI 1120 D Functional Overview The block diagram in Figure 4 1 illustrates the key functional components of the SCXI 1120 D Isolated Section SCXIbus ZN Nonisolated Section e Input Channel 0 Digital f P Input Channel 1 a K i Control 5 o o 5 2 2 5 5 2 o Oo e Timing S z e and e 9 Input Channel 6 Analog EI gt Output ml Stage gt Input Channel 7 Temparature Sensor Figure 4 1 SCXI 1120 D Block Diagram National Instruments Corporation 4 1 SCXI 1120 D User Manual Chapter 4 Theory of Operation The major components of the SCXI 1120 D are as follows SCxXIbus connector e Digital interface e Digital control circuitry e Timing and analog circuitry The SCXI 1120 consists of eight isolated amplifier channels with gains of 1 2 5 10 20 50 100 200 250 500 1 000 and 2 000 The SCXI 1120D consists of eight isolated a
13. NC NC NC NC NC NC NC Figure 3 8 SCXI 1120 D Rear Signal Connector Pin Assignments www natinst com Chapter 3 Signal Connections Rear Connector Signal Descriptions SCXI 1120 D rear connector signal descriptions are listed in Table 3 2 Table 3 2 Rear Connector Signal Descriptions Pin Signal Name Description 1 2 AOGND Analog Output Ground Connected to the analog reference when jumper W46 is in position AB RO 3 18 MCHO0 Analog Output Channels 0 through 7 Connects to the DAQ device through differential analog input channels MCH7 19 OUTREF Output Reference Serves as the reference node for the analog output channels and the temperature sensor in the DTS mode in the NRSE mode It should be connected to the analog input sense of the NRSE DAQ device 24 33 DIG GND Digital Ground Supply the reference for DAQ device digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or slot 0 26 SERDATOUT Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A DAQ Device Data Address Line Taps into the SCXIbus D A line to indicate to the module whether the incoming serial stream is data or address information 29 SLOTOSEL Slot 0 Select Taps into the SCXIbus INTR line to indicate whether the information on MOSI
14. SCXI 1120 D digital control Serial Data Out 4q Module ID Register Buffered i i Serial Data In Input Channel Configuration EE Select Register Buffered Digital S Control Signals Output SCANCLK Stage Path Control Control Hardware Scan Control Figure 4 3 SCXI 1120 D Digital Control The digital control section consists of the Configuration Register and the Module ID Register The Configuration Register provides channel selection and configures the SCXI 1120 D for scanning options All the control bits are fed into a latch before being routed to the rest of the module The channel select bits are taken directly from the shift register The Module ID Register contains the module ID 4 hex a code unique to the SCXI 1120 or 44 hex a code unique to the SCXI 1120D You can read this module ID over the SCXIbus to determine the type of module in a particular slot SCXI 1120 D User Manual 4 4 www natinst com Chapter 4 Theory of Operation Analog and Timing Circuitry The SCXIbus provides analog power 18 5 VDC that is regulated on the SCXI 1120 D to 15 VDC a guard an analog bus AB0 and a chassis ground CHSGND ABO buses the SCXI 1120 D output to other modules or receives outputs from other modules through the SCXIbus The guard guards the analog bus and can be connected through jumper W46 to the analog ground reference or can be left floating a connec
15. This chapter describes the input and output signal connections to the SCXI 1120 D module through the SCXI 1120 D front connector and rear signal connector and includes specifications and connection instructions for the signals given on the SCXI 1120 D connectors The following cautions contain important safety information concerning hazardous voltages AN Cautions Do not operate the device in an explosive atmosphere or where there may be flammable gases or fumes Keep away from live circuits Do not remove equipment covers or shields unless you are trained to do so If signal wires are connected to the device hazardous voltages may exist even when the equipment is turned off To avoid a shock hazard do not perform procedures involving cover or shield removal unless you are qualified to do so and disconnect all field power prior to removing covers or shields Equipment described in this document must be used in an Installation Category II environment per IEC 664 This category requires local level supply mains connected installation Do not operate damaged equipment The safety protection features built into this device can become impaired if the device becomes damaged in any way If the device is damaged turn the device off and do not use until service trained personnel can check its safety If necessary return the device to National Instruments for service and repair to ensure that its safety is not compromised Do not operate this equi
16. and source 80 dB at I kHz Output selection time with V step all gains to 0 012 accuracy ses 3 us Filter TYPE eee et es Second order low pass RC filter Cutoff frequency 3 dB 4 5 kHz 22 5 kHz Stability Recommended warm up 30 min Offset drift RTI esses 20 220 gain uV C Gain drift cei eae ie 50 ppm C National Instruments Corporation A 7 SCXI 1120 D User Manual Appendix A Specifications for SCXI 1120D Digital 1 0 Physical Environment Safety SCXI 1120 D User Manual Absolute maximum voltage input rating 5 5 V with respect to DIG GND Digital input specifications referenced to DIG GND Y input logic high voltage 2 V min Na input logic low voltage 0 8 V max I input current leakage pA max Digital output specifications referenced to DIG GND he output logic high voltage 3 7 V min at 4 mA max Nat output logic low voltage 0 4 V max at 4 mA max Dimensions eee 3 1 by 17 3 by 20 3 cm 1 2 by 6 8 by 8 0 in C nnectors iste emu 50 pin male ribbon cable rear connector 32 pin DIN C male front connector 18 screw terminal adapter available Operating temperature essse 0 to 50 C Storage temperature essssss 20 to 70 C Relative humidity oe eee eee 5 to 90 non
17. is being sent to a module or slot 0 36 SCANCLK Scan Clock Indicates to the SCXI 1120 D that a sample has been taken by the DAQ device and causes the SCXI 1120 D to change channels 37 SERCLK Serial Clock This signal taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 43 RSVD Reserved National Instruments Corporation 3 9 SCXI 1120 D User Manual Chapter 3 Signal Connections All other pins are not connected The signals on the rear connector can be classified as analog output signals digital I O signals or timing I O signals Signal connection guidelines for each of these groups are given in the following section Analog Output Signal Connections Pins I through 19 of the rear connector are analog output signal pins Pins 1 and 2 are AOGND signal pins AOGND is an analog output common signal that is routed through jumper W46 to the analog reference on the SCXI 1120 D You can use these pins for a general analog power ground tie point to the SCXI 1120 D if necessary In particular when using differential input DAQ devices such as the MIO 16 device it is preferable to leave jumper W46 in its factory default setting or in position AB R1 to avoid ground loops With DAQ devices that are configured for RSE measurements jumper W46 should be in position AB RO to connect the SCXI 1120 D analog ground reference to the DAQ analog ground Pin 19 is the OUTREF pin and is connected internally to
18. module Refer to your software manual Removable Cover Grounding Screw E Top of Module Front Connector Figure 2 2 Removing the SCXI Module Cover Digital Signal Connections SCXI 1120 D User Manual The four digital signal connection jumpers have position I marked on the module Position 3 is not marked explicitly on the module The SCXI 1120 D has three jumpers dedicated for communication between the DAQ device and the SCXIbus These jumpers are W42 W43 and W44 2 4 www natinst com Chapter 2 Configuration and Installation Using Jumpers W42 and W43 Leave jumpers W42 and W 43 in their factory default settings if any one of the following applies e The SCXI 1120 D is not cabled to a DAQ device The SCXI 1120 D is cabled to a DAQ device and the SCXI chassis is the only SCXI chassis cabled to that DAQ device e The SCXI 1120 D is cabled to a DAQ device and there are multiple SCXI chassis cabled to that DAQ device with shielded cables In the factory default setting jumper W43 connects after buffering the SCXIbus Master In Slave Out MISO line to the SERDATOUT pin of the rear signal connector In this setting along with the proper setting of jumper W42 the DAQ device can read the SCXI 1120 D Module ID Register See Chapter 3 Signal Connections for the pin equivalencies of the SCXI 1120 D rear signal connector and the DAQ device I O connector Revisions A and B of the SCXI 112
19. of reading typ 0 696 of reading max Nonlinearity sensere rs 0 04 of fullscale range 3m Offset voltage eene peste e uV tGain Stability versus ambient temperature Offset drift RTI o2 uV Ct kr Gain Gain drift sss 20 ppm C Input bias current essessss 80 pA Input resistance Normal esee reed ts 1GQ Power O0ffisnsatususgssnstuinent 50 kQ Overload seniii neoniek 50 kQ National Instruments Corporation A 1 SCXI 1120 D User Manual Appendix A Specifications for SCXI 1120 Output resistance Multiplexed output mode 100 Q Parallel output mode 330 Q Filtering jumper selectable 4 Hz 10 dB or 10 kHz 3 dB 3 pole RC Output selection time with 5 V step all gains 0 012 accuracy sssss 5 2 us typ 7 us max 0 012 accuracy sss 3 us 0 006 accuracy sssssses 10 us 0 001596 accuracy sss 20 us Rise time 4 Hz intem 0 12 s IO KHz eI US 70 us Slew TALE ai Pg eee 0 15 V us Noise 400 kHz bandwidth Input gain 1 000 4 Hz filter eee 100 nV ins 10 KHz filter 4 UV aus Output gain 1 qz hoste lika 150 UV ms IO KHz 5er I mV Operating common mode voltage 50 or 60 Hz Channel to channel or channel to earth 250 Vins Common mode reje
20. on Revision C and later SCXI 1120 modules jumper 42 connects a pullup resistor to the SERDATOUT signal on the rear signal connector Jumper W46 configures the guard the analog output ground and enables the NRSE mode Jumpers W1 through W8 configure the first stage gain of channels 0 through 7 respectively Jumpers W9 through W16 configure the second stage gain of channels 0 through 7 respectively Jumpers W17 through W24 configure the first stage filtering of input channels 0 through 7 respectively Jumpers W25 through W40 configure the second stage filtering of input channels 0 through 7 respectively Jumper W41 directly connects the temperature sensor to the rear signal connector To do so set jumper W46 in the AB R2 or AB RO position first 2 3 SCXI 1120 D User Manual Chapter 2 Configuration and Installation Tables 2 1 to 2 2 list the description and configuration of the user configurable jumpers To change the configuration of the module refer to Figures 2 1 and 2 2 as you perform the following steps 1 2 4 5 Remove the grounding screw of the SCXI module 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 jumpers you want to change and replace them on the appropriate pins Snap the top cover back in place Replace the grounding screw to ensure proper shielding You must use software to further configure the
21. the analog reference when jumper W46 is in position AB R2 Pins 3 through 18 are the analog output channels of the SCXI 1120 D Pins 3 and 4 or MCHO are a multiplexed output of all eight channels and the temperature sensor output Pins 5 through 18 or MCH1 through MCHT are a parallel connection of channels 1 through 7 to the rear connector Pin 18 is a direct connection to the temperature sensor when jumper W41 is in position 3 Notice that the temperature sensor is located on the terminal block For further details on configuring the temperature sensor output refer to the SCXI 1320 and SCXI 1328 terminal block installation guides hy Note The SCXI 1120 D analog outputs are short circuit protected SCXI 1120 D User Manual 3 10 www natinst com Chapter 3 Signal Connections The digital I O signals of the SCXI 1120 D match the digital I O lines of the MIO 16 device When used with an SCXI 1341 SCXI 1342 or SCXI 1344 cable assembly the SCXI 1120 D signals match the digital lines of the Lab NB Lab PC Lab LC devices and the PC LPM 16 PnP device respectively Table 3 3 lists the equivalencies For more information consult your cable assembly installation guide Table 3 3 SCXIbus to SCXI 1120 D Rear Connector to DAQ Device Pin Equivalencies SCXI 1120 D Rear Signal MIO E Series Lab and 1200 SCXIbus Line Connector Device Series Device PC LPM 16 PnP MOSI SERDATIN DIOO PB4 DOUT4 D A DAQD A DIOI PB5 DOUT5
22. utility routines Worldwide Support SCXI 1120 D User Manual National Instruments has offices located around the globe Many branch offices maintain a Web site to provide information on local services You can access these Web sites from www natinst com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office 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 Norway 32 27 73 00 Singapore 2265886 Spain Barcelona 93 582 0251 Spain Madrid 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 B 2 www natinst com Glossary Prefix Meaning Value p pico 10 12 n nano 10 9 u micro
23. 0 On Revision A and B SCXI 1120 modules jumper W42 is not used Set jumper W43 as explained in the cases above except in the case of a multichassis ribbon cable system In a multichassis ribbon cable system with Revision A and B SCXI 1120 modules cabled to the DAQ device you can access the MISO line in only one chassis Pick one of the chassis that has the SCXI 1120 cabled to the DAQ device Set jumper W43 on the SCXI 1120 to position 1 On the SCXI 1120 modules that are in the other chassis and cabled to the DAQ device set jumper W43 to position 3 Notice that you will only be able to access digital information from the chassis that has the SCXI 1120 with jumper W43 set to position 1 Revisions C and Later of the SCXI 1120 and All Revisions of the SCXI 1120D Jumper W42 in position 1 connects a 2 2 KQ pullup resistor to the SERDATOUT line Position 3 does not connect the pullup resistor to the SERDATOUT line The SERDATOUT line is driven with an open collector driver An open collector driver drives low or goes to a high impedance state relying on a pullup resistor to make the signal line go high National Instruments Corporation 2 5 SCXI 1120 D User Manual Chapter 2 Configuration and Installation When using a single chassis leave W42 and W43 in position I on the SCXI 1120 D that is connected to the DAQ device In this setting the module drives MISO to SERDATOUT and connects the necessary pullup resistor to the SERDATOUT line
24. 0 and SCXI 1120D SCXI 1120 D modules and contains information concerning their installation and operation The SCXI 1120 and SCXI 1120D are National Instruments Signal Conditioning eXtensions for Instrumentation SCXI Series modules The SCXI 1120 D provides eight isolated input channels Each channel is independently configurable through jumpers The SCXI 1120 module is designed for low cost signal conditioning of thermocouples volt sources millivolt sources and 4 to 20 mA sources or 0 to 20 mA process current sources where high common mode voltages exist The SCXI 1120D module is designed for low cost signal conditioning of volt millivolt and current sources that require a 20 kHz bandwidth and where high common mode voltages exist H AN italic Lab 1200 PC SCXI 1120 The following conventions appear in this manual The symbol indicates that the following text applies only to a specific product a specific operating system or a specific software version 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 Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Lab device refers to the Lab LC Lab NB Lab PC Lab PC Lab PC 1200 and Lab PC 12
25. 00AI PC refers to the IBM PC XT the IBM PC AT and compatible computers SCXI 1120 refers to only the SCXI 1120 module National Instruments Corporation ix SCXI 1120 D User Manual About This Manual SCXI 1120D SCXI 1120D refers to only the SCXI 1120D module SCXI 1120 D SCXI 1120 D refers to both the SCXI 1120D module and the SCXI 1120 module Slot 0 Slot 0 refers to the power supply and control circuitry in the SCXI chassis National Instruments Documentation The SCXI 1120 D User Manual is one piece of the documentation set for your DAQ system You could have any of several types of manuals depending on the hardware and software in your system Use the manuals you have as follows SCXI 1120 D User Manual Getting Started with SCXI If you are using SCXI this is the first manual you should read It gives an overview of the SCXI system and contains the most commonly needed information for the modules chassis and software Your SCXI hardware user manuals lf you are using SCXI read these manuals next for detailed information about signal connections and module configuration They also explain in greater detail how the module works and contain application hints Your DAQ hardware documentation This documentation has detailed information about the DAQ hardware that plugs into or is connected to your computer Use this documentation for hardware installation and configuration instructions specification information
26. 2 13 SCXI 1120 D User Manual Chapter 2 Configuration and Installation Hardware Installation You can install the SCXI 1120 D in any available SCXI chassis The following are general installation instructions Consult your SCXI chassis manual for specific instructions and warnings 1 Turn off the computer that contains the DAQ device or disconnect it from your SCXI chassis Turn off the SCXI chassis Do not insert the SCXI 1120 D into a chassis that is powered on Insert the SCXI 1120 D into the module guides Gently guide the module into the back of the slot until the connectors make contact If you have already installed a cable assembly in the rear of the chassis the module and cable assembly must be firmly engaged however do not force the module into place Screw the front mounting panel of the SCXI 1120 D to the top and bottom threaded strips of your SCXI chassis If you are connecting the module to a DAQ device connect the cable assembly from the rear signal connector of your module to the I O connector of your DAQ device by following the instructions in your cable installation guide 3 Note Cable your DAQ device to only one module in each chassis 6 7 8 Visually verify the installation Turn on the SCXI chassis Turn on the computer or reconnect it to your chassis The SCXI 1120 D module is installed and ready for operation SCXI 1120 D User Manual 2 14 www natinst com Signal Connections
27. 22P sls e ELLE ae ee hie T TE sner d ah x aa a M E md le L cele ML rare EGG N scxibus cia v we ff oh an ou HE d Connector E f A Digital E Grounding Jumpers Screw First Stage Filter Jumpers First Stage Gain Jumpers Second Stage Gain Jumpers 8 o UU80000000000000000000008 ES LL ES REAR Figure 2 1 SCXI 1120 D Parts Locator Diagram z 181deyg uomjej ejsu pue UONEINBYLOJ Chapter 2 Configuration and Installation The jumpers are used as follows Fixed jumpers On Revision A and B SCXI 1120 modules jumper W42 is unused and should not be connected Jumper W45 is reserved and should not be reconfigured On Revision A and B SCXI 1120 modules jumper W44 carries the SLOTOSEL signal from the rear signal connector after buffering to the SCXIbus INTR line and should be left in the SCXI 1120 factory default position position 1 On all SCXI 1120D modules and on Revision C and later SCXI 1120 modules jumper W44 does not exist 3 Note The revision letter is located on the National Instruments label located on the side of each SCXI 1120 D module The revision letter is found in the part number and is the letter found in that part number O National Instruments Corporation User configurable jumpers Jumper W43 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the rear signal connector On all SCXI 1120D and
28. AC coupled signal connections figure SCXI 1120 3 6 SCXI 1120D 3 7 floating signal connections referenced to chassis ground figure 3 5 front connector 3 3 to 3 7 analog input channels 3 5 to 3 7 pin assignments figure 3 3 signal descriptions table 3 4 temperature sensor connections 3 7 G gain determination calculating 4 7 gain jumpers for SCXI 1120 D 2 10 to 2 12 allocation table 2 10 to 2 11 positions table 2 11 to 2 12 grounding jumper W46 settings table 2 8 to 2 9 ground referenced signal connections figure 3 5 installation See also configuration hardware installation 2 14 unpacking the SCXI 1120 D 1 3 J jumpers analog configuration 2 8 to 2 13 gain jumpers 2 10 to 2 12 jumper W41 direct temperature connection 2 10 jumper W46 grounding shielding and reference mode selection 2 8 to 2 9 SCXI 1120 filter jumpers 2 12 to 2 13 SCXI 1120 D filter jumpers 2 13 O National Instruments Corporation l 3 Index digital signal connections 2 4 to 2 8 jumper W42 and W43 2 5 to 2 6 jumper W44 2 6 jumper W45 table 2 8 fixed jumpers 2 3 parts locator diagram 2 2 steps for configuring 2 4 user configurable jumpers 2 3 L LabVIEW software 1 3 LabWindows CVI software 1 4 manual See documentation MCH0 through MCH7 signals table 3 9 module configuration See configuration Module ID Register 4 4 MTEMP signal table 3 4 multiplexed mode 4 10 to 4 11 N
29. B Technical Support Resources Glossary Index Figures Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware essere 1 5 Figure 2 1 SCXI 1120 D Parts Locator Diagram see 2 2 Figure 2 2 Removing the SCXI Module Cover sere 2 4 Figure 3 1 SCXI 1120 D Front Connector Pin Assignments sss 3 3 Figure 3 2 Ground Referenced Signal Connection for the SCXI 1120 D with High Common Mode Voltage eee 3 5 Figure 3 3 Floating Signal Connection for the SCXI 1120 D Referenced to Chassis Ground for Better Signal to Noise Ratio 3 5 SCXI 1120 D User Manual vi www natinst com Contents Figure 3 4 Floating AC Coupled Signal Connection for the SCXI 1120 3 6 Figure 3 5 AC Coupled Signal Connection for the SCXI 1120 with High Common Mode Voltage 3 6 Figure 3 6 AC Coupled Signal Connection for the SCXI 1120D with High Common Mode Voltage eee 3 7 Figure 3 7 Floating AC Coupled Signal Connection for the SCXI 1120D 3 7 Figure 3 8 SCXI 1120 D Rear Signal Connector Pin Assignments 3 8 Figure 4 1 SCXI 1120 D Block Diagram 4 1 Figure 4 2 Digital Interface Circuitry Block Diagram sse 4 3 Figure 4 3 SCXI 1120 D Digital Control eene 4 4 Figure 4 4 Analog Input Block Diag
30. B W35 W36 6 W23 A W23 B W37 W38 7 W24 A W24 B W39 W40 2 12 www natinst com Chapter 2 Configuration and Installation Your SCXI 1120 is shipped in the 4 Hz position Verify that both stages are set to the same bandwidth to ensure that the required bandwidth is achieved Notice that one jumper block is available for each filter stage SCXI 1120D Filter Jumpers Two stage filtering is also available on your SCXI 1120D module The first stage is located in the isolated section of the input channel whereas the second stage is located in the nonisolated section of your input channel Two stage filtering eliminates the noise generated by the isolation amplifier producing a higher signal to noise ratio Furthermore two filter bandwidths are available 22 5 kHz and 4 5 kHz Table 2 7 SCXI 1120D Filter Jumper Allocation First Second Filter Jumper Filter Jumper Input 4 5 kHz 4 5 kHz Channel Factory Factory Number Default 22 5 kHz 22 5 kHz Default 0 W17 A W17 B W25 W26 1 W18 A W18 B W27 W28 2 W19 A W19 B W29 W30 3 W20 A W20 B W31 W32 4 W21 A W21 B W33 W34 5 W22 A W22 B W35 W36 6 W23 A W23 B W37 W38 7 W24 A W24 B W39 W40 Your SCXI 1120D is shipped in the 4 5 kHz position Verify that both stages are set to the same bandwidth to ensure that the required bandwidth is achieved Notice that one jumper block is available for each filter stage O National Instruments Corporation
31. Convention S E M ix National Instruments Documentation eese enne nnne nennt X Chapter 1 Introduction About the SCX 120 D tre eb eme eee Pet eR RS 1 1 What You Need to Get Started eee teme tit teet tert e cote epa 1 2 Unp cking ettet d UR TR EID UR RR Re RH beina 1 3 Software Programming Choices ernnrrarvrrenrnnrvevrvnvrrnennvevvenvvernnevrarvrrerasvrrerssnsrsvesneesvesneer 1 3 National Instruments Application Software esee 1 3 NI DAQ Driver Software orani aaee o E AE enne enne 1 4 Optional Equipment epe e karet EEE EEEE sa kne eine rte E E E eee EEk 1 5 Chapter 2 Configuration and Installation Module Configuration nissen i eao eren ene nennen trennen trennen nnne 2 1 Digital Signal Connections zeit retirer tete teat tab ees 2 4 Using Jumpers W42 and W43 erenrrnorenvrvvrvvvnvrevnvnvrervervrerrarerarsrveverer 2 5 Using Jumper W44 on Revisions A and B of the SCXI 1120 2 6 Using Jumper W44 on Revision C of the SCXI 1120 and All Revisions of the SCXI 1120D see 2 6 Analog Configuration sess ener nennen nennen nnne 2 8 Grounding Shielding and Reference Mode Selection 2 8 Direct Temperature Connection esee 2 10 Gain Jumpers for the SCXI 1120 D see 2 10 SCXI 1120 Filter Jumpers eese 2 12 SCXI 1120D Filter Jumpers
32. Figure 3 7 Floating AC Coupled Signal Connection for the SCXI 1120D Temperature Sensor Connection Pins C2 and C4 are dedicated for connecting to a terminal block temperature sensor The temperature sensor is not isolated and is referenced to the chassis ground The connection is overvoltage protected to 25 VDC with power on and 15 VDC with power off National Instruments Corporation 3 7 SCXI 1120 D User Manual Chapter 3 Signal Connections SCXI 1120 D Rear Connector 5 SCXI 1120 D User Manual Figure 3 8 shows the pin assignments for the SCXI 1120 D rear signal connector Note If you will be using the SCXI 1120 D with a National Instruments DAQ device and cable assembly you do not need to read the remainder of this chapter If you will also be using the SCXI 1180 feedthrough panel the SCXI 1343 rear screw terminal adapter or the SCXI 1351 one slot cable extender with the SCXI 1120 D you should read this section AOGND MCHO MCH1 MCH2 MCH3 MCH4 MCH5 MCH6 MCH7 OUTREF NC NC SERDATIN DAQD A SLOTOSEL NC DIG GND NC SERCLK NC NC RSVD NC NC NC P 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 AOGND MCHO MCH1 MCH2 MCH3 MCH4 MCH5 MCH6 MCHT7 NC NC DIG GND SERDATOUT NC NC NC NC SCANCLK
33. Instruments Corporation 4 11 SCXI 1120 D User Manual Calibration This chapter discusses the SCXI 1120 D calibration procedures Calibration Equipment Requirements For best measurement results calibrate the SCXI 1120 D so that its offset is adjusted to 0 3 mV RTO and 0 6 uV RTI No special equipment is needed other than a regular voltmeter with the following specifications e Range 30 mV to 300 mV e Resolution 3 5 digits or greater A multiranging 3 5 digit digital multimeter can provide you with the necessary function as described previously We will refer to the measuring instrument as a digital multimeter DMM Each channel on the SCXI 1120 D has two potentiometers dedicated for calibration One potentiometer is used to null the output offset the other is used to null the input offset Re calibrate your SCXI 1120 D once a year Offset Null Adjust To avoid erroneous results when nulling the amplifier follow these steps in the order indicated To null the offset of the amplifier channels complete the following steps 1 Set the DMM range to the smallest range that can measure 3 mV 2 Short the inputs of the DMM together and then to chassis ground 3 Record the measurement indicated by the DMM display This is the DMM inherent offset and it should be subtracted from subsequent measurements 4 Short the desired channel inputs together and then to chassis ground Set the amplifier gain to 1 Natio
34. Jumper W46 3 Note The SCXI 1120 D will drive pins 4 6 8 10 12 14 16 and 18 on the rear signal connector although the SCXI 1120 D is in multiplexed mode SCXI 1120 D User Manual 2 8 www natinst com Chapter 2 Configuration and Installation Table 2 2 Jumper W46 Settings Description Configuration B ROR 1 Factory default setting in parking position AB RO Connects the analog reference to AOGND pins I and 2 of the rear signal connector Use with RSE DAQ devices Do not use with DIFF differential input DAQ devices AB R1 Connects SCXIbus guard to the analog reference AB R2 Enables the NRSE mode and connects OUTREF pin 19 of the rear signal connector to the analog reference Use when SCXI 1120 D has to operate with DAQ devices that have NRSE input Do not use with DIFF input DAQ devices RDSE National Instruments Corporation 2 9 SCXI 1120 D User Manual Chapter 2 SCXI 1120 D User Manual Configuration and Installation Direct Temperature Connection Jumper W41 Table 2 3 Jumper W41 Settings Description Configuration Position 1 Temperature sensor accessed in MTS mode factory default setting Position 3 Temperature sensor accessed in DTS mode DAQ device configured for NRSE or RSE mode Can access sensor in parallel with other eight outputs or scan with other channels without software interference Connects to pin 18 of the
35. Manual Appendix A Specifications for SCXI 1120D Transfer Characteristics Nonlinearity oerte ees Offset error RTI ssssss Gain error mmmmemrereeresesnsrrrrnrnrererereeser Amplifier Characteristics Input impedance Power On Power off and overvoltaged Input bias current sees CMRR at DCl ne CMRR at 50 or 60 Hz sss Output range ettet entes Output impedance eee Dynamic Characteristics 0 04 FSR 6 uV 3 mV gain 0 4 of reading typ 0 6 max 1 MQ 500 kQ 15 p gt 110 dB gt 98 dB 5V 100 Q in multiplexed mode 330 Q in parallel mode Bandwidth 3 dB 4 5 kHz or 22 5 kHz jumper selectable Slew Rate cose 2 V us Table A 2 System Noise RTI 0 1 Hz to 50 kHz 0 Q in low lead SCXI 1120 D User Manual Gain Noise 0 5 10 UV ms VHz 1 000 0 1 u V NHz A 6 www natinst com Appendix A Specifications for SCXI 1120D Table A 3 Switching Supply Noise approximately at 100 kHz Gain Noise 0 5 174 UV ime 1 000 4 UV ms Barth ground referenced input signal Phase shift using TBX 1329 AC coupled Input to output 0 5 between 5 Hz and 280 Hz Channel to channel 0 5 up to 5 kHz ED I DE chiar anced lt 0 1 at TVims f 1 kHz G 0 5 lt 1 5 at 3 mV f 1 kHz G 1 000 Crosstalk 50 Q load
36. SCXT SCXI 1120 D User Manual Eight Channel Isolated Analog Input Module and Eight Channel Wide Band Isolated Analog Input Module for Signal Conditioning September 1999 Edition INSTRUMENTS Part Number 320425D 01 yN NATIONAL Worldwide Technical Support and Product Information www natinst 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 Norway 32 27 73 00 Singapore 2265886 Spain Barcelona 93 582 0251 Spain Madrid 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubs natinst com O Copyright 1992 1999 National Instruments Corporation All rights reserved Important Information Warranty Copyright The SCXI 1120 and SCXI
37. TION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING 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 Contents About This Manual
38. about your DAQ hardware and application hints Software documentation You may have both application software and NI DAQ software documentation National Instruments application software includes ComponentWorks LabVIEW LabWindows CVI Measure and VirtualBench After you set up your hardware system use either your application software documentation or the NI DAQ documentation to help you write your application If you have a large complicated system it is worthwhile to look through the software documentation before you configure your hardware Accessory installation guides or manuals If you are using accessory products read the terminal block and cable assembly installation guides They explain how to physically connect the relevant pieces of the system Consult these guides when you are making your connections SCXI Chassis Manual If you are using SCXI read this manual for maintenance information on the chassis and installation instructions X www natinst com Introduction This chapter describes the SCXI 1120 D lists what you need to get started describes the optional software optional equipment and custom cables and explains how to unpack the SCXI 1120 D kit About the SCXI 1120 D The SCXI 1120 D has eight isolated input channels The SCXI 1120 is a module for signal conditioning of thermocouples volt sources millivolt sources 4 to 20 mA current sources and 0 to 20 mA process current sources If external exci
39. ational Instruments application software 1 3 to 1 4 National Instruments Web support B 1 to B 2 NI DAQ driver software 1 4 to 1 5 0 online problem solving and diagnostic resources B 1 operation of SCXI 1120 D See theory of operation OUTREF signal table 3 9 SCXI 1120 D User Manual Index P parallel mode 4 10 parts locator diagram 2 2 physical specifications SCXI 1120 A 3 SCXI 1120 D A 8 pin assignments front connector figure 3 3 rear connector figure 3 8 powerup state 4 2 problem solving and diagnostic resources online B 1 R rear connector 3 8 to 3 11 analog output signal connections 3 10 to 3 11 pin assignments figure 3 8 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 signal descriptions table 3 9 reference mode selection jumper W46 settings table 2 8 to 2 9 requirements for getting started 1 2 revisions jumper settings See jumpers letter location note 2 3 S safety specifications SCXI 1120 A 4 SCXI 1120 D A 8 SCANCLK signal table 3 9 SCXI 1120 D See also theory of operation block diagram 4 1 features and overview 1 1 to 1 2 major components 4 2 optional equipment 1 5 parts locator diagram 2 2 SCXI 1120 D User Manual powerup state 4 2 requirements for getting started 1 2 revision letter location note 2 3 software programming choices 1 3 to 1 5 National Instruments application software 1 3 to 1 4 NI DAQ driver softwa
40. condensing Designed in accordance with IEC 61010 1 UL3111 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 Pollution Degree 2 A 8 www natinst com Technical Support Resources This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access NI Web Support To provide you with immediate answers and solutions 24 hours a day 365 days a year National Instruments maintains extensive online technical support resources They are available to you at no cost are updated daily and can be found in the Technical Support section of our Web site at www natinst com support Online Problem Solving and Diagnostic Resources e KnowledgeBase A searchable database containing thousands of frequently asked questions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback e Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and provide detailed inf
41. ction ratio 50 or 60 Hz I KQ in input leads 160 dB min at 4 Hz bandwidth NMR 50 or 60 HZ 60 dB at 4 Hz bandwidth Includes the combined effects of the SCXI 1120 and the AT MIO 16F 5 ncludes the combined effects of the SCXI 1120 and the AT MIO 16E 2 with 1 m or 2 m cable 3 Includes the combined effects of the SCXI 1120 and the AT MIO 16X with 1m or 2 m cable SCXI 1120 D User Manual A 2 www natinst com Appendix A Specifications for SCXI 1120 Input protection continuous 250 Vms max Output protection ornrervnrrrovvrrvravrnvvrne Continuous short to ground Power consumption eese 170 mA at 18 5 V 50 mA at 5 V Digital 1 0 Absolute maximum voltage input rating serseri 5 5 V with respect to DIG GND Digital input specifications referenced to DIG GND Ve input logic high voltage 2 V min Vi input logic low voltage 0 8 V max I input current leakage uA max Digital output specifications referenced to DIG GND Y output logic high voltage 3 7 V min at 4 mA max E output logic low voltage 0 4 V max at 4 mA max Physical Dimensions eterne 3 1 by 17 3 by 20 3 cm 1 2 by 6 8 by 8 0 in CORDeCLOIS orient er een 50 pin male ribbon cable rear connector 32 pin DIN C male front connector 18 screw terminal adapter available Environment Operating temperature
42. e of 5 to 7 in Ib Connections including power signals to ground and vice versa that exceed any of the maximum signal ratings on the SCXI device can create a shock or fire hazard or can damage any or all of the devices connected to the SCXI chassis the host computer and the SCXI device National Instruments is not liable for any damages or injuries resulting from incorrect signal connections If high voltages 230 Vims and 42 4 V peak or 60 VDC are present you must connect a safety earth ground wire to the terminal block safety ground solder lug This complies with safety agency requirements and protects against electric shock when the terminal block is not connected to the chassis To connect the safety earth ground to the safety ground solder lug run an earth ground wire in the cable from the signal source to the terminal block National Instruments is Nor 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 on the terminal block when connecting the safety ground wire To do so reduces the safety isolation between the high voltage and safety ground Clean devices and terminal blocks by brushing off light dust with a soft nonmetallic brush Remove other contaminants with deionized water and a stiff nonmetallic brush The unit must be completely dry and free from contaminants before returning to service Use only National Instrumen
43. e overall gain of a given channel on the SCXI 1120D use the following formula Overall Gain I 5 x First Stage Gain x Second Stage Gain Table 2 5 Gain Jumper Positions Gain Setting Jumper Position First stage 1 D 10 C 50 B 100 A factory default setting O National Instruments Corporation 2 11 SCXI 1120 D User Manual Chapter 2 SCXI 1120 D User Manual Configuration and Installation Table 2 5 Gain Jumper Positions Continued Gain Setting Jumper Position Second stage 1 A 2 B 5 C 10 D factory default setting for the SCXI 1120 20 E factory default setting for the SCXI 1120D SCXI 1120 Filter Jumpers Two stage filtering is also available on your SCXI 1120 module The first stage is located in the isolated section of the input channel whereas the second stage is located in the nonisolated section of your input channel Two stage filtering eliminates the noise generated by the isolation amplifier producing a higher signal to noise ratio Furthermore two filter bandwidths are available 10 kHz and 4 Hz Table 2 6 SCXI 1120 Filter Jumper Allocation First Second Filter Jumper Filter Jumper Input 4 Hz 4 Hz Channel Factory Factory Number Default 10 kHz Default 10 kHz 0 W17 A W17 B W25 W26 1 WI18 A W18 B W27 W28 2 W19 A W19 B W29 W30 3 W20 A W20 B W31 W32 4 W21 A W21 B W33 W34 5 W22 A W22
44. ent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National 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 CUSTOMERS 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 misu
45. ies of functions for using LabWindows CVI with National Instruments DAQ hardware is included with your NI DAQ software kit The LabWindows CVI Data Acquisition Library is functionally equivalent to the NI DAQ software VirtualBench features virtual instruments VIs that combine DAQ products software and your computer to create a stand alone instrument with the added benefit of the processing display and storage capabilities of your computer VirtualBench instruments load and save waveform data to disk in the same forms that can be used in popular spreadsheet programs and word processors Using Component Works LabVIEW LabWindows CVI or VirtualBench software will greatly reduce the development time for your data acquisition and control application NI DAQ Driver Software The NI DAQ driver software is included at no charge with all National Instruments DAQ hardware NI DAQ has an extensive library of functions that you can call from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation digital I O counter timer operations SCXI RTSI self calibration messaging and acquiring data to extended memory NI DAQ also internally addresses many of the complex issues between the computer and the plug in device such as programming interrupts and DMA controllers NI DAQ maintains a c
46. if the module appears damaged in any way Do not install a damaged module into your SCXI chassis e Never touch the exposed pins of connectors Software Programming Choices There are several options to choose from when programming your National Instruments plug in DAQ and SCXI hardware You can use LabVIEW LabWindows CVI NI DAQ ComponentWorks Measure VirtualBench or register level programming National Instruments Application Software ComponentWorks contains tools for data acquisition and instrument control built on NI DAQ driver software ComponentWorks provides a higher level programming interface for building virtual instruments through standard OLE controls and DLLs With ComponentWorks you can use all of the configuration tools resource management utilities and interactive control utilities included with NI DAQ LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments devices is included with LabVIEW The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI DAQ software National Instruments Corporation 1 3 SCXI 1120 D User Manual Chapter 1 Introduction LabWindows CVI features interactive graphics a state of the art user interface and uses the ANSI standard C programming language The LabWindows CVI Data Acquisition Library a ser
47. isions of the SCXI 1120D On Revision C SCXI 1120 modules and all revisions of the SCXI 1120D modules jumper W44 is not loaded and SLOTOSEL is always buffered to the INTR line SCXI 1120 D User Manual 2 6 www natinst com Chapter 2 Configuration and Installation Table 2 1 Digital Signal Connections Jumper Settings Jumper Description Configuration W42 Position 1 Connects pullup to SERDATOUT factory default setting Applies only to SCXI 1120 Revisions C or later and all SCXI 1120D modules W42 Position 3 Parking position not connected on Revisions A and B of the SCXI 1120 W43 Position 1 Connects MISO to SERDATOUT factory default setting W43 Position 3 Parking position O National Instruments Corporation 2 7 SCXI 1120 D User Manual Chapter 2 Configuration and Installation Table 2 1 Digital Signal Connections Jumper Settings Continued Jumper Description Configuration W44 Connects SLOTOSEL to the SCXIbus INTR line after 3 buffering factory default setting Applies to Revision A 2 and B of the SCXI 1120 1 modules only W45 Factory default setting 3 2 1 Analog Configuration The SCXI 1120 D has 42 analog configuration jumpers Notice that the jumper configurations for each channel are similar only the jumper reference designator number changes Grounding Shielding and Reference Mode Selection
48. ls for channels 1 through 7 are sent to the rear connector but are usually ignored All reads from the module are from the MCHO signal of the rear connector which can be configured as the output of any channel of the SCXI 1120 D or as the output of any other module in multiplexed mode that is sending its output onto the SCXIbus You can also configure the SCXI 1120 D to send any one of its outputs to the SCXIbus Thus in multiplexed mode only one module in a chassis needs to be connected to a DAQ device you can pass signals from the other modules to the DAQ device through the SCXIbus 4 10 www natinst com Chapter 4 Theory of Operation Multiplexed mode is also useful for performing scanning operations with the SCXI 1120 D The MIO devices Lab PC and the 1200 Series DAQ devices all support scanning The SCXI chassis is programmed with a module scan list that dynamically controls which module sends its output to the SCXIbus during a scan You can specify this list to scan the modules in any order with an arbitrary number of channels for each module entry in the list However the channels on the SCXI 1120 D must be scanned in a consecutive ascending order after channel 7 is scanned the module wraps back to channel 0 and continues You can program the SCXI 1120 D to start scans with any channel hy Note The SCXI 1120 D parallel outputs continuously drive the RSC pins even when the module is configured in multiplexed mode National
49. mplifier channels with gains of 0 5 1 2 5 5 10 25 50 100 125 250 500 and 1 000 The SCXI 1120 D also has a digital section for automatic control of channel scanning and temperature selection The theory of operation of each of these components is explained in the rest of this chapter Power Up State The SCXI 1120 D powers up or resets in parallel mode SCXI 1120 D User Manual 4 2 www natinst com Chapter 4 Theory of Operation SCXIbus Connector and Digital Interface Figure 4 2 shows a diagram of the SCXI 1120 D and SCXIbus digital interface circuitry SCXIbus oO n E 2 O g zo z A 8 y SERDATIN Buffered Serial CL rl DAQD A 5 Data ra 9 Digital Interface Lig SLOTOSEL E Buffered Digital SERCLK o Signal Controls ra Sg SERDATOUT Figure 4 2 Digital Interface Circuitry Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section The SCXI 1120 D connects to the SCXIbus through a 4 x 24 metral receptacle and to the DAQ device through a 50 pin ribbon cable header The digital interface circuitry buffers the digital signals from the DAQ device and the SCXIbus and sends signals back and forth between the DAQ device and the SCXIbus National Instruments Corporation 4 3 SCXI 1120 D User Manual Chapter 4 Theory of Operation Digital Control Gircuitry Figure 4 3 diagrams the
50. nal hexadecimal Hardscan Control Register Hardscan Reset bit hertz input current leakage inches Interrupt signal input output O National Instruments Corporation G 3 SCXI 1120 D User Manual Glossary LOAD LSB MCH MCHft MIO MISO MOD MOSI MSB MTEMP MTS NRSE SCXI 1120 D User Manual kelvin Load bit least significant bit meters megabytes of memory Positive Analog Output Channel Number signal Negative Analog Output Channel Number signal multifunction I O Master In Slave Out signal Module Number bit Master Out Slave In signal most significant bit Multiplexed Temperature Sensor signal multiplexed tempe nonreferenced single ended input G 4 www natinst com 0 ONCE OUTREF RESET RSC RSE RSVD RTD RTEMP RTI RTO RTSI S SCANCLK SCANCLKEN Glossary Once bit Output Reference signal parts per million random access memory Read bit Reset signal root mean square rear signal connector referenced single ended input Reserved bit signal resistance temperature detector Read Temperature bit referred to input referred to output Real Time System Integration Scan Clock signal Scan Clock Enable bit O National Instruments Corporation G 5 SCXI 1120 D User Manual Glossary SCANCON SCANCONEN SCXI SDK S SERCLK SERDATIN SERDATOUT SL SLOTOSEL SPI SPICLK SS T tempco TRIGO U UL SCXI 1120 D User Manual Scanning
51. nal Instruments Corporation 5 1 SCXI 1120 D User Manual Chapter 5 Calibration 6 Connect the amplifier output to the DMM Make sure that the DMM can achieve the accuracy and resolution you need 7 Adjust the output potentiometer of the desired channel until the output is 0 3 mv 8 Set the DMM range to the smallest range that can measure 6 mV 9 Set the amplifier gain to 1 000 10 Adjust the input potentiometer of the desired channel until the output is 0 6 mV 11 Go to the next channel You may seal the potentiometers after calibration with antisabotage lacquer to avoid tampering with the calibration Table 5 1 lists the potentiometer reference designators that correspond to each channel Table 5 1 Calibration Potentiometers Reference Designators Input Amplifier Channel Channel Number Input Null Output Null 0 RO8 R24 1 R10 R25 2 R12 R26 3 R14 R27 4 R16 R28 5 R18 R29 6 R20 R30 7 R21 R31 SCXI 1120 D User Manual 5 2 www natinst com Specifications SCXI 1120 This appendix lists the specifications for the SCXI 1120 and SCX 1120D These are typical at 25 C unless otherwise stated The operating temperature range is 0 to 50 C Analog Input Gain jumper selectable 1 2 5 10 20 50 100 200 250 500 1 000 2 000 Output range 5 V Number of channels 8 Gain accuracy 0 296
52. o 2 8 jumpers W42 and W43 2 5 to 2 6 jumpers W44 2 6 summary of jumper settings table 2 7 to 2 8 jumpers fixed jumpers 2 3 parts locator diagram 2 2 steps for configuring 2 4 user configurable jumpers 2 3 removing SCXI module cover figure 2 4 revision letter location note 2 3 Configuration Register 4 4 conventions used in manual ix x D DAQD A signal description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 diagnostic resources online B 1 DIG GND signal table 3 9 digital control circuitry 4 4 digital interface circuitry block diagram 4 3 SCXI 1120 D User Manual l 2 digital I O specifications SCXI 1120 A 3 SCXI 1120 D A 8 digital signal connections 2 4 to 2 8 jumper W42 and W43 2 5 to 2 6 Revisions A and B of SCXI 1120 2 5 Revisions C and later of SCXI 1120 D 2 5 to 2 6 summary of settings table 2 7 to 2 8 jumper W44 2 6 all Revisions of SCXI 1120 D 2 6 description table 2 8 Revision C of SCXI 1120 D 2 6 Revisions A and B of SCXI 1120 2 6 summary of settings table 2 8 jumper W45 table 2 8 direct temperature connection 2 10 documentation conventions used in manual ix x National Instruments documentation x DTEMP signal table 3 4 E environment specifications SCXI 1120 A 3 SCXI 1120 D A 8 equipment optional 1 5 F filter jumpers SCXI 1120 2 12 to 2 13 SCXI 1120 D 2 13 fixed jumpers 2 3 www natinst com floating
53. o a different channel of the DAQ device National Instruments Corporation 1 1 SCXI 1120 D User Manual Chapter 1 Introduction With the SCXI 1120 D the SCXI chassis can serve as a fast scanning signal conditioner for laboratory testing production testing and industrial process monitoring Detailed specifications of the SCXI 1120 D are listed in Appendix A Specifications What You Need to Get Started SCXI 1120 D User Manual To set up and use your SCXI 1120 D you will need the following items Q Q SCXI 1120 or SCXI 1120D module SCXI 1120 D User Manual One of the following chassis and your SCXI chassis manual SCXI 1000 SCXI 1000DC SCXI 1001 SCXI 2000 An SCXI terminal block connector assembly optional DAQ device or SCXI 1200 Your computer 1 2 www natinst com Chapter 1 Introduction Unpacking Your SCXI 1120 D module is shipped in an antistatic package to prevent electrostatic damage to the module Electrostatic discharge can damage several components on the module To avoid such damage in handling the module take the following precautions e Ground yourself using a grounding strap or by holding a grounded object e Touch the antistatic package to a metal part of your SCXI chassis before removing the module from the package e Remove the module from the package and inspect the module for loose components or any other sign of damage Notify National Instruments
54. onsistent software interface among its different versions so that you can change platforms with minimal modifications to your code Whether you are using conventional programming languages LabVIEW or LabWindows CVI your application uses the NI DAQ driver software as illustrated in Figure 1 1 SCXI 1120 D User Manual 1 4 www natinst com Chapter 1 Introduction Personal T 2 gt Computer or aleware Workstation Conventional Programming Enviroment Macintosh or Sun NI DAQ Driver Software Virtual Bench Windows 95 3 1 ComponentWorks LabVIEW LabWindows CVI Windows 95 NT Windows 95 3 1 NT Windows 95 3 1 NT i Macintosh or Sun or Sun Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware Optional Equipment National Instruments offers a variety of products to use with your SCXI 1120 D as follows e Cables and cable assemblies shielded and ribbon Shielded terminal blocks and connector and shell assemblies e SCXI process current resistor kit e SCXI modules and accessories for isolating amplifying exciting and multiplexing signals for relays and analog output With SCXI you can condition and acquire up to 3 072 channels For additional information about optional equipment available from National Instruments refer to your National Instruments catalogue or call the office nearest
55. or the SCXI 1120D Due to this decrease in the amplifier bandwidth you will notice a decrease in the channel overall bandwidth but a better noise immunity If this bandwidth limitation is unacceptable you should spread the gains over both stages thus increasing the BW of each amplifier stage This will introduce in most cases a negligible effect on the channel bandwidth For example to achieve a gain of 100 for the SCXI 1120 use G 10 and G 10 for a gain of 1 000 use G ic 50 and Gy a 20 However for the SCXI 1120D minimal effects are introduced at G lt 100 Refer to Appendix A Specifications for Gain versus BW for the SCXI 1120D All the amplifier input channels are overvoltage protected to 250 Vms with power on or off National Instruments Corporation 4 7 SCXI 1120 D User Manual Chapter 4 Theory of Operation The isolated amplifiers fulfill two purposes on the SCXI 1120 D module They convert a small signal riding on a high common mode voltage into a single ended signal with respect to the SCXI 1120 D chassis ground With this conversion the input analog signal can be extracted from a high common mode voltage or noise before being sampled and converted by the DAQ device The isolated amplifier also amplifies and conditions an input signal which results in an increase in measurement resolution and accuracy After isolation further filtering is available to increase the noise immunity of the amplifier channel I
56. ormation ranging from simple getting started instructions to advanced topics e Product Manuals A comprehensive searchable library of the latest editions of National Instruments hardware and software product manuals Hardware Reference Database A searchable database containing brief hardware descriptions mechanical drawings and helpful images of jumper settings and connector pinouts Application Notes A library with more than 100 short papers addressing specific topics such as creating and calling DLLs developing your own instrument driver software and porting applications between platforms and operating systems National Instruments Corporation B 1 SCXI 1120 D User Manual Appendix B Technical Support Resources Software Related Resources Instrument Driver Network A library with hundreds of instrument drivers for control of standalone instruments via GPIB VXI or serial interfaces You also can submit a request for a particular instrument driver if it does not already appear in the library e Example Programs Database A database with numerous non shipping example programs for National Instruments programming environments You can use them to complement the example programs that are already included with National Instruments products e Software Library A library with updates and patches to application software links to the latest versions of driver software for National Instruments hardware products and
57. pment in a manner that contradicts the information specified in this document Misuse of this equipment could result in a shock hazard Terminals are for use only with equipment that has no accessible live parts Do not substitute parts or modify equipment Because of the danger of introducing additional hazards do not install unauthorized parts or modify the device Return the device to National Instruments for service and repair to ensure that its safety features are not compromised National Instruments Corporation 3 1 SCXI 1120 D User Manual Chapter 3 Signal Connections When using the device with high common mode voltages you MUST insulate your signal wires for the highest input voltage National Instruments is not liable for any damages or injuries resulting from inadequate signal wire insulation Use only 26 to 14 AWG wire with a voltage rating of 300 V and 60 C for measuring 250 to 300 V use only 600 V and 60 C for measuring 480 V Prepare your signal wire by stripping the insulation no more than 7mm When connecting or disconnecting signal lines to the SCXI terminal block screw terminals make sure the lines are powered off Potential differences between the lines and the SCXI ground create a shock hazard while you connect the lines When using this module with a terminal block connect the signal wires to the screw terminals by inserting the stripped end of the wire fully into the terminals Tighten the terminals to a torqu
58. ram serrrnrrnornvrvvrevvnevrrvrevnrrvvveverversverneevreevreer 4 6 Figure 4 5 Analog Output Circuitry essere 4 0 Tables Table 2 1 Digital Signal Connections Jumper Settings esses 2 7 Table 2 2 Jumper W46 Settings renes 2 9 Table 2 3 Jumper WAI Settings iiri seiiher sesioa ioen na rE Eeee 2 10 Table 2 4 Gain Jumper Allocation sese 2 10 Table 2 5 Gain Jumper Positions nios eee ette 2 11 Table 2 6 SCXI 1120 Filter Jumper Allocation esoervrrrrovrnvvrnrvrrvrnvvrrvrnvvrrernevsren 2 12 Table 2 7 SCXI 1120D Filter Jumper Allocation eee 2 13 Table 3 1 SCXI 1120 D Front Connector Signal Descriptions 3 4 Table 3 2 Rear Connector Signal Descriptions eee 3 9 Table 3 3 SCXIbus to SCXI 1120 D Rear Connector to DAQ Device Pin Equivalencies ronornvrnvrrvvnvnnvvrrvrnvnrrnnrrververvnrveerse 3 11 Table 5 1 Calibration Potentiometers Reference Designators 5 2 Table A 1 Input Signal Range eese enne nennen nene A 5 Table A 2 System Noise RTI 0 1 Hz to 50 KHZ eene A 6 Table A 3 Switching Supply Noise approximately at 100 kH2 A 7 O National Instruments Corporation Vii SCXI 1120 D User Manual About This Manual Conventions This manual describes the electrical and mechanical aspects of the SCXI 112
59. re 1 4 to 1 5 unpacking 1 3 SCXIbus connector and digital interface 4 3 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 SERCLK signal description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 SERDATIN signal description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 SERDATOUT signal description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 shielding jumper W46 settings table 2 8 to 2 9 signal connections 3 1 to 3 11 front connector 3 3 to 3 7 analog input channels 3 5 to 3 7 pin assignments figure 3 3 signal descriptions table 3 4 temperature sensor connections 3 7 rear connector 3 8 to 3 11 analog output signal connections 3 10 to 3 11 pin assignments figure 3 8 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 signal descriptions table 3 9 safety precautions 3 1 to 3 2 www natinst com SLOTOSEL signal description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 software programming choices 1 3 to 1 5 National Instruments application software 1 3 to 1 4 NI DAQ driver software 1 4 to 1 5 software related resources B 2 specifications A 1 to A 8 SCXI 1120 A 1 to A 4 analog input A 1 to A 3 digital I O A 3 environment A 3 physical A 3 safety A 4 SCXI 1120 D A 5 to A 8 amplifier characteristics A 6 analog inp
60. rear signal connector and corresponds to ACHI5 of the MIO devices or the PC LPM 16 PnP Gain Jumpers for the SCXI 1120 D Each input channel has two user configurable gain stages The first gain stage provides gains of 1 10 50 and 100 and the second stage provides gains of 1 2 5 10 and 20 Tables 2 4 and 2 5 show how to set up the gain for each channel Table 2 4 Gain Jumper Allocation Input Channel First Gain Second Gain Number Jumper Jumper 0 WI W9 1 W2 W10 2 W3 WII 3 WA W12 4 WS W13 5 W6 W14 2 10 www natinst com Chapter 2 Table 2 4 Gain Jumper Allocation Continued Input Channel First Gain Second Gain Number Jumper Jumper 6 W7 WIS 7 W8 W16 Configuration and Installation Notice that the SCXI 1120D has an additional fixed pre stage gain of 0 5 The SCXI 1120 is shipped with the first stage gain set to 100 position A and a second stage gain set to 10 position D The SCXI 1120D is shipped with the first stage gain set to 100 position A and the second stage gain set to 20 position E To change the gain of your module move the appropriate jumper on your module to the position indicated in Tables 2 3 and 2 4 Refer to Figure 2 1 for jumper locations on your module To determine the overall gain of a given channel on the SCXI 1120 use the following formula Overall Gain First Stage Gain x Second Stage Gain To determine th
61. se or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control 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 Component Works CVI LabVIEW Measure nat inst com National Instruments NI DAQ 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 APPLICA
62. sitive input bias current Typical resistor values range from 100 kQ to I MQ This solution although necessary in this case lowers the input impedance of the input channel amplifier and introduces an additional offset voltage proportional to the input bias current and to the resistor value used The typical input bias current of the amplifier consists of 80 pA and a negligible offset drift current When a 100 kQ resistor is used this will result into 8 uV of offset which is insignificant in most applications However if larger valued bias resistors are used significant input offset may result To determine the maximum offset introduced by the biasing resistor use the following equation V ofsbias Las x Rbias 3 6 www natinst com Chapter 3 Signal Connections The input signal range of an SCXI 1120 input channel is 5 V G otal referenced to its negative input where G ta is equal to the product of the first stage and second stage gains In addition the input channels are overvoltage protected to 250 Vms With power on or off at a maximum of 4 5 MA ms sink or source SCXI 1120D When connecting AC coupled signals to the SCXI 1120D you do not need to add the external resistor as the SCXI 1120D provides a DC path internally Refer to Figures 3 6 and 3 7 for further details Figure 3 6 AC Coupled Signal Connection for the SCXI 1120D with High Common Mode Voltage
63. t is important to note that the overall amplifier bandwidth is determined by both filtering stages so to achieve the required bandwidth both filtering sections should be set the same as indicated in Chapter 2 Configuration and Installation SCXI 1120 D User Manual 4 8 www natinst com Chapter 4 Theory of Operation Analog Output Circuitry Figure 4 5 shows the SCXI 1120 D analog output circuitry SCXIbus ABO Output Switch Stage Control Channel 0 7 MCHO Output Mux e C Channel 7 MCHO MTEMP oe From MCH1 Channel 1 MCH1 Output Stage and e Rear Connector Hardware Scan e Control From MCH6 Channel 6 Analog MCH6 Reference Er rii MCH7 Channel 7 W41 DTEMP MCHT7 Figure 4 5 Analog Output Circuitry The SCXI 1120 D output circuitry consists of a buffered output multiplexer and channel select hardware The channel select hardware consists of a counter This counter is needed when the module is operating in the multiplexed output mode National Instruments Corporation 4 9 SCXI 1120 D User Manual Chapter 4 Theory of Operation SCXI 1120 D User Manual In the parallel output mode the counter is disabled and amplifier channel 0 is selected at the output multiplexer and is connected to MCHO The seven other channels are hardwired to MCH1 through MCH7 on
64. tation is provided thermistors RTDs and strain gauges can also be measured The SCXI 1120D is a module for signal conditioning and isolating volt sources millivolt sources and current sources that require a bandwidth of up to 20kHz If you provide external excitation you can use strain gauges and other vibration sensors The SCXI 1120 D can operate in two output modes in the parallel output mode with all eight input channels connected in parallel to eight DAQ device channels or in the multiplexed output mode with all eight channels multiplexed into a single DAQ device channel The SCXI 1120 D operates with full functionality with the National Instruments MIO 1200 Series and Lab PC devices You can use the Lab NB the Lab PC the Lab LC and the PC LPM 16 PnP devices with the SCXI 1120 D but these devices cannot scan the module when it is configured in the multiplexed output mode These devices can perform only single channel reads in this mode You can multiplex several SCXI 1120 D modules into a single channel thus greatly increasing the number of analog input signals that can be digitized The addition of a shielded terminal block provides screw terminals for easy signal attachment to the SCXI 1120 D In addition a temperature sensor for cold junction compensation CJC of thermocouples is included on the terminal block This cold junction reference CJR is either multiplexed along with the eight channels or connected by jumpers t
65. the rear connector The output multiplexer multiplexes all eight amplifier outputs and the temperature sensor reading provided on the MTEMP line This measurement is only software controlled For hardware control of the temperature sensor reading connect the temperature sensor to pin 18 on the rear connector as described in Chapter 2 Configuration and Installation The multiplexer output connects to the MCHO and is connected to the DAQ device analog channel input In the case of the MIO DAQ devices MCH0 x on the rear connector corresponds to ACHO and ACH8 Notice that when the multiplexed output mode is selected pins 5 through 18 on the rear connector are still driven by the SCXI 1120 D The SCXI 1120 D outputs on the rear connector are short circuit protected Parallel Mode When the MCHO signal is configured to be the output of channel 0 the rear connector simultaneously carries each of the outputs of the SCXI 1120 D on different pins and the module is in parallel mode In this mode you can use an SCXI 1180 feedthrough panel to make each of the outputs available at the front of the chassis A DAQ device cabled to an SCXI 1120 D in parallel mode reads a separate output signal from the module on each of its analog inputs You cannot multiplex the parallel outputs of a module onto the SCXIbus only a DAQ device directly cabled to the module has access to the outputs Multiplexed Mode Recommended In multiplexed mode the output signa
66. tion can be made by another device The DAQ device analog input and timing is the interface between the SCXI 1120 D output and the DAQ device National Instruments Corporation 4 5 SCXI 1120 D User Manual Chapter 4 Theory of Operation Analog Input Channels Figure 4 4 shows the analog input block diagram Front Connector SCXI 1120D Only Input Channel 0 i VVW D SERO ies ko I LPF Ir LPF cL 7 5 SCXI 1120D Only _ Input Channel 1 i VVV 1 511 KQ on ko LPF C LPF Y EFE f P SCXI 1120D Only Input Channel 2 WWW 1 COEUR 511k LPF gt LPF mm i DF SCXI 1120D Only Input Channel 3 1 511 kQ Sor ko LPF LPF i wae SCXI 1120D Only _ InPut Channel 4 1 511 kQ i ko LPF LPF LT FTT SCXI 1120D Only IP Channel 5 i VVV D ERES ies ka LPF C LPF 7 SSP i 177 SCXI 1120D Only _ Input Channel 6 1511 ko is ko LPF bt LPF DE SZ S T 727 SCXI 1120D Only Input Channel 7 WW i EE ies ko I LPF Lo LPF See i 7 MTEMP DTEMP To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage SCXI 1120 D User Manual Figure 4 4 Analog Input Block Diagram
67. ts high voltage TBX Series cable assemblies with high voltage TBX Series terminal blocks AN Caution To comply with the UL North America or CE use this module with a UL or CE marked SCXI chassis SCXI 1120 D User Manual 3 2 www natinst com SCXI 1120 D Front Connector Chapter 3 Signal Connections Figure 3 1 shows the pin assignments for the SCXI 1120 D front connector CHO CH1 NC CH2 CH3 NC CH4 CH5 NC CH6 CH7 NC NC RSVD 45V CHSGND XEKEKEKEKEKEKE gt EN oo X E o X A X a Po X eo XX KeA B X X X AN X X X X X CN X X X X X v X gt x lt X X gt x lt NS gt x lt X gt x lt X X v X X gt x lt X X X gt x lt X CHO CH1 NC CH2 CH3 NC CH4 CH5 NC CH6 CH7 NC RSVD RSVD MTEMP DTEMP PJ This symbol represents no physical pin XEKEKEKEKEKEKE gt co X o X A X De X eo XXK Figure 3 1 SCXI 1120 D Front Connector Pin Assignments National Instruments Corporation SCXI 1120 D User Manual Chapter 3 Signal Connections Front Connector Signal Descriptions SCXI 1120 D front connector signal descriptions are listed in Table 3 1 Table 3 1 SCXI 1120 D Front Connector Signal Descriptions Pin Signal Name Description A2
68. ut A 5 to A 7 digital I O A 8 dynamic characteristics A 6 to A 7 environment A 8 filter A 7 input characteristics A 5 physical A 8 safety A 8 stability A 7 transfer characteristics A 6 system requirements 1 2 T technical support resources B 1 to B 2 temperature connection direct 2 10 temperature sensor connection 3 7 theory of operation 4 1 to 4 11 analog and timing circuitry 4 5 to 4 11 analog input channels figure 4 6 analog output circuitry 4 9 to 4 11 formula for gain determination 4 7 National Instruments Corporation l 5 Index block diagram of SCXI 1120 D 4 1 digital control circuitry 4 4 functional overview 4 1 to 4 2 SCXIbus connector and digital interface 4 3 U user configurable jumpers 2 3 V VirtualBench software 1 4 W W41 jumper direct temperature connection 2 10 W42 and W43 jumpers 2 5 to 2 6 all Revisions of SCXI 1120D 2 5 to 2 6 Revisions A and B of SCXI 1120 2 5 Revisions C and later of SCXI 1120 2 5 to 2 6 summary of settings table 2 7 to 2 8 W44 jumper digital signal connections all Revisions of SCXI 1120 D 2 6 description table 2 8 Revision C of SCXI 1120 D 2 6 Revisions A and B of SCXI 1120 2 6 summary of settings table 2 8 W45 jumper table 2 8 W46 jumper grounding shielding and reference mode selection 2 8 settings table 2 9 Web support from National Instruments B 1 to B 2 online problem solving and diagnostic resources
69. you National Instruments Corporation 1 5 SCXI 1120 D User Manual Configuration and Installation This chapter describes how to configure the SCXI 1120 D jumpers and how to install the SCXI 1120 D into the SCXI chassis Module Gonfiguration The SCXI 1120 D includes 46 jumpers that are shown in Figure 2 1 O National Instruments Corporation 2 1 SCXI 1120 D User Manual enue 48S G 0zL L IXIS c LU0O2 SUI eu MMM Terminal Block Mounting Hole Connector and Shell Mounting Holes Terminal Block Mounting Hole Thumbscrew A ba Thumbscrew FRONT Product Name Assembly Number Null and Serial Number Output is Adjust Potentiometers Input Null Gas Second Stage otentiometers 3 Filter Jumpers d S NORUNN te RO HR RCC y Rear Ia camo em samer n Ge u Signal JEn vs ji E ge soga OE ance FEE Connector Ei cafe Ba iscieer Hh aig dug Se tyne 1 a Front mee DIP Bio isnieeP i p r2 7 Connector Ee ral on geal GAINDIP fem o isoreer Bae A ga Sag Siy Tib cuju ea p eier galls oe Bens md D 4 Gal pie ferd 1501

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