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SCXI-1126 User Manual - National Instruments

1. Front Connector Diagram Pin Number Column A Column B Column C 32 CHO CHO Column 31 um A B C 30 CH1 CH1 o NEN 32 o o 29 31 28 NC NC 30 o o 29 2l E 28 o o 26 CH2 CH2 27 25 eo 24 CH3 CH3 25 24 o o E m m 23 22 NC NC 22 o o 21 21 20 CH4 CH4 20 o o 19 19 18l o 18 CH5 CH5 17 17 16 o 7 16 NC NC 1 5 15 Ex 14 o o 13 14 CH6 CH6 12 o o 13 11 12 CH74 CH7 10 o o T m 9 10 NC NC 8 o o 7 9 6 o o 8 NC NC 5 7 E m o 4 o o 6 NC NC 3 2 o o 5 m m 1 4 NC NC Lo 3 e NC means no connection 2 CHSGND NC means no physical pin 1 National Instruments Corporation 2 5 SCXI 1126 User Manual Chapter 2 Using the SCXI 1126 Front Connector Signal Descriptions SCXI 1126 front connector signal descriptions are listed in Table 2 2 Table 2 2 SCXI 1126 Front Connector Signal Descriptions Pin Signal Name Description A2 CHSGND Chassis Ground Connects to the SCXI chassis A4 A6 A8 A10 C2 Not Connected Do not connect any signals to these pins C4 C6 C8 C10 A16 C16 A22 C22 A28 C28 A12 A14 A18 A20 CH7 through CHO Positive Input Channels Positive inputs to A24 A26 A30 A32 channels 7 through 0 respectively C1
2. Specifications All specifications for the SCXI 1126 assume a 20 to 30 C ambient operating temperature and are valid for one year from the date of purchase unless otherwise noted All specifications are relative to calibration standards and require a 15 minute warm up period Specifications do not include transducer error Frequency Input Input Characteristics Number of channels e 8 Input frequency ranges software selectable and corresponding output voltage range Input Frequency Ranges Output Voltage Range 0 to 250 Hz 0to5V 0 to 500 Hz 0 to 1 kHz 0 to 2 kHz 0 to 4 kHz 0 to 8 kHz 0 to 16 kHz 0 to 32 kHz 0 to 64 kHz 0 to 128 kHz 1 V refers to DC or AC peak National Instruments Corporation A 1 SCXI 1126 User Manual Appendix A Specifications Minimum recommended input frequency Filter Setting Minimum Input Frequency 1 Hz 15 Hz 40 Hz 600 Hz 320 Hz 5 kHz 1000 Hz 15 kHz Minimum input pulse width Input signal amplitude range Input coupling eene Maximum working voltage Signal common mode voltage Overvoltage protection Inputs protected eseeseesess Input impedance Powered 0n ied Qverload eere iee eieaa Powered Off Input bias cur
3. S Comparator with Frequency to o bg Input Protection Optical Isolation gt Voltage e CH7 gt g 9 T Conversion CH7 a I Thresholdand j ra 2 7 E EIS Threshold and Range Filter E AOGND S o Hysteresis Le Optical Isolation Setti Multiplexer o oH 8 bit p 9 ettings 7 OUTREF T E WZ Resolution aes y D a Scan Clock S A E x Analog Bus t iL Switch Comparator with Frequency to 8 Eq Input Protection Optical Isolation gt Voltage 9 Conversion V 5 E Threshold and FER EE sd Digital 8 p Hysteresis Range Filter Interface and E Mobi Optical Isolation Settings Control E vera Ap d TS CC tree Soca x x Resolution Calibration a EEPROM Figure 1 1 SCXI 1126 Block Diagram 1 2 ni com SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 The SCXI 1126 consists of eight isolated frequency input channels each with software programmable frequency ranges of 0 250 Hz 0 500 Hz 0 1 kHz 0 2 kHz 0 4 kHz 0 8 kHz 0 16 kHz 0 32 kHz 0 64 kHz and 0 128 kHz Each channel has its own software programmable input threshold and hysteresis with a voltage range of 0 5 to 4 5 V In addition each channel also has a 4 pole lowpass output filter with software programmable cutoffs of 1 Hz 40 Hz 320 Hz and 1 kHz The SCXI 1126 also has a digital section for automatic control of channel scanning frequency range selection filter selection and input threshold and hyster
4. 3 To change the cabled module put the module in parallel mode change the E Series DAQ device which connects to this module or set up a multichassis daisy chain left click the Details button and click the Cabling tab 4 When you have finished click OK 5 When you have completed configuring the module click OK The SCXI chassis and SCXI module s should now be configured properly If you need to change the module configuration right click the module you want to change and select Properties If you need to change the actual module go to the Chassis Configuration window and repeat steps 1 through 5 If the configuration is complete test the system as described in the Verifying and Self Testing the Configuration in NI DAQmx section to ensure the SCXI system is communicating properly with the E Series DAQ device Verifying and Self Testing the Configuration in NI DAQmx SCXI 1126 User Manual To test the successful configuration of the system complete the following steps after opening MAX 1 Verify that the chassis power is on and is correctly connected to an E Series DAQ device 2 Display the list of devices and interfaces by clicking the next to the Devices and Interfaces icon 3 From the list that appears under NI DAQmx Devices locate the chassis you want to test Right click the chassis and click Test 4 If the communication test is successful a message Chassis Verified appears Click OK 1 18 ni com Chapte
5. In many cases the default input of a control is a certain value often 0 that means use the current default setting a plug in data acquisition device module card or pad that can contain multiple channels and conversion devices SCXI modules are distinct from devices with the exception of the SCXI 1200 which is a hybrid a TTL level signal having two discrete levels a high and a low level digital ground signal Deutsche Industrie Norme SCXI 1126 User Manual Glossary DIO F s frequency H hysteresis Hz I O II in K K kbytes s kS M MB SCXI 1126 User Manual digital input output 1 Fahrenheit a temperature measurement scale 2 farad a measurement unit of capacitance frequency source the number of alternating signals that occur per unit time the window below a certain trigger level a signal must pass before the trigger occurs hertz cycles per second of a periodic signal The unit of measure for frequency input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces input current leakage inch or inches kelvin a unit for data transfer that means 1 000 or 10 bytes s 1 000 samples 1 Mega the standard metric prefix for 1 million or 106 when used with units of measure such as volts and hertz 2 mega the prefix for 1 048 576 or 220 when used w
6. damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the 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 ComponentWorks CVI LabVIEW Measure Measurement Studio National Instruments NI ni com 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 Patents For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 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 WH
7. ensuring that the cable fits securely 5 Connectthe other end of the cable to the E Series DAQ device you are using to control the SCXI system 6 Check the cable installation making sure the connectors and cable adapter are securely fastened at both ends 7 Poweron the SCXI chassis Power on the computer SCXI 1126 User Manual 1 12 ni com Chapter 1 Installing and Configuring the SCXI 1126 E l ah 1 E Series DAQ Device 3 Cable Adapter 2 SH68 68 Cable 4 SCXI Chassis Power Switch Figure 1 3 Connecting an SCXI Chassis to an E Series DAQ Device If you have already installed the appropriate software refer to the Configuring and Self Testing section to configure the SCXI 1126 module s for multiplexed mode operation Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in a PXI Combination Chassis In this configuration you can multiplex all eight channels of the SCXI 1126 into a single channel of the E Series DAQ device in a combination PXI chassis You need the following items for this installation e PXI combination chassis with the SCXI module s installed e PXI MIO E Series DAQ device installed in the right most PXI slot Consult the PXI chassis documentation other SCXI module documentation and E Series DAQ device documentation for additional instructions and cautions You should have already installed your software Na
8. ABO on the SCXIbus connector instead of CHO under software control If the SCXI 1126 is the cabled module you can configure the analog bus switch circuitry to route a signal placed on ABO by another SCXI module using the output buffer to CHO where it can be read by the E Series DAQ device When a signal passes on the SCXIbus from the scanned module to the E Series DAQ device through the cabled module the measurement is called indirect scanning When a signal passes directly from the cabled module to the E Series DAQ device the measurement is called direct scanning Figure 1 1 illustrates the signal paths controlled by the analog bus switch circuitry You can software configure the output stage for two modes of operation multiplexed mode or parallel mode SCXI 1126 User Manual 1 4 ni com Chapter 1 Installing and Configuring the SCXI 1126 Multiplexed Mode Recommended In multiplexed mode an E Series DAQ device connects to only one module in a chassis and reads from CHO on the rear signal connector If the SCXI 1126 is the cabled module all of the SCXI 1126 channels are multiplexed onto CHO along with the signals from other SCXI modules that are multiplexed on the SCXIbus If the SCXI 1126 is not the cabled module all of its channels are placed on the SCXIbus and are then sent to the E Series DAQ device through CHO on the cabled module The output signals for channels 1 through 7 on the SCXI 1126 are always sent to the rear signal
9. NI DAQ Devices and the chassis you want to configure 2 Adda module in an empty module number If a module number is not empty right click the module number you want to change and select Delete 3 Right click the slot you want to configure and select Insert 4 In the list box select a module you want to add and click Next 5 Selectthe E Series DAQ device to which this specific module connects if itis a cabled module Otherwise select None and click Next If you select a device select the This device will control the chassis checkbox if you want the device as the communicating device 6 Continue following the onscreen instructions to complete the configuration When you have clicked Finish the module configuration is complete 7 Repeat steps 2 through 6 until you have added all the modules The SCXI chassis and SCXI module s should now be configured properly If you need to change the module configuration right click the module you want to change and select Properties If you need to change the actual module repeat steps 2 through 6 If the configuration is complete test the system as described in the Verifying and Self Testing the Configuration in Traditional NI DAQ section to ensure the SCXI system is communicating properly with the E Series DAQ device Verifying and Self Testing the Configuration in Traditional NI DAQ SCXI 1126 User Manual To test the successful configuration of the system complete the following s
10. after software initialization and set up operations the maximum rate at which the hardware can operate any event that causes or starts some form of data capture transistor transistor logic a voltage range that only spans positive voltages the output equivalent of a scan One or more analog or digital output samples Typically the number of output samples in an update is equal to the number of channels in the output group For example one pulse from the update clock produces one update which sends one new sample to every analog output channel in the group the number of output updates per second volts volts direct current volts root mean square G 8 O National Instruments Corporation Index A AC coupled signal connections figure 2 3 AC signal connections floating figure 2 3 Address Handler 1 6 analog bus switch circuitry 1 4 analog input channels AC coupled signal connections figure 2 3 floating AC signal connections figure 2 3 floating signal connections figure 2 2 ground referenced signal connections figure 2 2 analog multiplexer buffered 1 4 AOGND signal table 2 8 bridge configuration overview 1 21 buffered analog multiplexer 1 4 C CH7 through CHO signals table 2 6 CH7 through CHO signals table 2 6 CHSGND signal table 2 6 configuration manually adding modules 1 18 self test verification 1 16 1 18 steps in 1 14 troubleshooting self test verification 1
11. allows an E Series DAQ device to control the SCXI 1126 and the rest of the chassis Refer to the Signal Connections section of Chapter 2 Using the SCXI 1126 for more information Digital Control Circuitry SCXI 1126 User Manual The digital control circuitry consists of the following e The Module ID register which contains the module ID of 1 a code unique to the SCXI 1126 e The configuration registers that set up the modes of operation and control the functions of the SCXI 1126 e The Address Handler which controls which register is being addressed 1 6 ni com Chapter 1 Installing and Configuring the SCXI 1126 What You Need to Get Started To set up and use the SCXI 1126 you need the following items D DO DUC LD UU CCLUZSL SCXI 1126 module SCXI 1126 User Manual Read Me First Safety and Radio Frequency Interference SCXI chassis and documentation SCXI terminal block connector assembly optional E Series DAQ device and documentation 1 8 in flathead screwdriver Small Phillips screwdriver A computer National Instruments Documentation The SCXI 1126 User Manual is one piece of the documentation set for your data acquisition 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 National Instruments Corporation Getting Started with SCXI This is the first manual you should read It gives an overvi
12. connector and drive pins 5 through 18 In multiplexed mode these output signals are ignored by the E Series DAQ device and are short circuit protected Use multiplexed mode if your sampling rate is 333 kS s Most applications sample rate is X10 kHz You also can use multiplexed mode to perform scanning operations with the SCXI 1126 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 When scanning the SCXI 1126 you can start scans with any channel but you must scan the channels in a consecutive ascending order Sy Note The SCXI 1126 parallel outputs continuously drive the rear signal connector pins even when the module is configured in multiplexed mode While in multiplexed mode the minimum scan interval is 3 us This is the smallest interval in which you can switch between analog channels on the module and still measure accurate voltages specifically the accuracy at 3 us is 0 012 of full scale The 3 us scan interval gives you a maximum sampling rate of 333 kHz Because this rate is much higher than the 1 kHz maximum output bandwidth of a single SCXI 1126 channel you can sample multiple channels on multiple SCXI modules without undersampling one of the SCXI 1126 channels Refer to Appendix A Specifications for more i
13. from the positive input channel to the signal reference to provide the DC path for the positive input bias current Typical resistor values range from 100 kQ to 1 MQ This solution although necessary in this case reduces the input impedance of the input channel This can introduce loading errors if the signal source has a high output impedance Refer to Appendix A Specifications for information on channel input impedance National Instruments Corporation 2 3 SCXI 1126 User Manual Chapter 2 Using the SCXI 1126 The input signal range of an SCXI 1126 input channel is 0 5 to 4 5 V referenced to its negative input In addition the input channels are overvoltage protected to 250 Vms with power on or off at a maximum of 5 mA ms sink or source SCXI 1126 Front Connector SCXI 1126 User Manual This section provides detailed information about the front and rear signal connectors If you are creating a custom terminal block using the SCXI 1330 terminal block read this section for information on signal locations on the front signal connector Table 2 1 shows the SCXI 1126 positive input channel locations in Column A with their corresponding negative input channels located in column C The pin descriptions are given in Table 2 2 and the analog input connections are discussed in the Analog Input Channels section 2 4 ni com Table 2 1 Front Signal Pin Assignments Chapter 2 Using the SCXI 1126
14. have configured all the channels 1 21 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Threshold Level To set the threshold level complete the following steps 1 Select the channel s you want to configure for threshold level You can select blocks of channels by pressing the lt Shift gt key while making the selections or individual channels by pressing the Ctrl key while making the selections Under the Settings tab set the threshold level by entering the value in the Level box Repeat steps 1 and 2 until you have configured all the channels Threshold Hysteresis To set the threshold hysteresis complete the following steps 1 Select the channel s you want to configure for threshold hysteresis You can select blocks of channels by pressing the lt Shift gt key while making the selections or individual channels by pressing the lt Ctrl gt key while making the selections Under the Settings tab set the threshold hysteresis by entering the value in the Hysteresis box Repeat steps 1 and 2 until you have configured all the channels Removing the SCXI 1126 This section provides details for removing an SCXI 1126 module from an SCXI chassis and for removing the SCXI 1126 module from MAX Removing the SCXI 1126 from Measurement amp Automation Explorer To remove a module from MAX complete the following steps after launching MAX SCXI 1126 User Manual 1 Display the li
15. tee s Analog Ground i Figure 2 1 Ground Referenced Signal Connection for the SCXI 1126 with High Common Mode Voltage Sensor SCXI Terminal Block SCXI 1126 Module ee PS ERP TR d E 2 2 gt rn f CH Va Rbias Isolated V V analog CHSGND Ground Ground vt Optional Figure 2 2 Floating Signal Connection for the SCXI 1126 Referenced to Chassis Ground for Better Signal to Noise Ratio Caution Adding the bias resistor Ry 4 shown in Figure 2 2 breaks the isolation barrier SCXI 1126 User Manual ni com Chapter 2 Using the SCXI 1126 Sensor SCXI Terminal Block SCXI 1126 Module F vV CH 2 gt gt y D Fs Rehunt Vout gt gt ipie Va RoiasS 55 Isolated V V Analog CHSGND Ground Ground Optional Figure 2 3 Floating AC Coupled Signal Connection for the SCXI 1126 N Caution Adding the bias resistor Ry 4 shown in Figure 2 3 breaks the isolation barrier Sensor SCXI Terminal Block SCXI 1126 Module CH gt d Fs 2 Vout gt gt i CH Vom High Isolated us CMV Ground Ground E c Figure 2 4 AC Coupled Signal Connection for the SCXI 1126 with High Common Mode Voltage When you connect AC coupled signals to the SCXI 1126 as shown in Figures 2 3 and 2 4 connect an external resistor
16. 19 configuration settings excitation level 1 21 filter bandwidth 1 22 connecting SCXI 1126 to DAQ device See DAQ devices conventions used in the manual iv National Instruments Corporation D DAC 1 bit 1 4 DAQ devices connecting to SCXI 1126 for multiplexed scanning in PXI combination chassis 1 13 in SCXI chassis 1 12 DAQD A signal description table 2 8 pin equivalencies table 2 9 DIG GND signal table 2 8 digital control circuitry 1 6 direct scanning 1 4 E excitation setting excitation voltage level 1 21 F filters bandwidth configuration 1 22 floating AC signal connections figure 2 3 floating signal connections figure 2 2 frequency input specifications input characteristics A 1 output characteristics A 4 transfer characteristics A 3 frequency to voltage conversion frequency to voltage conversion stage 1 4 isolated input stage 1 3 multiplexed mode output stage 1 5 output stage 1 4 parallel mode output stage 1 6 SCXI 1126 User Manual Index front connector AC coupled signal connections figure 2 3 analog input channels 2 1 floating AC signal connections figure 2 3 floating signal connections figure 2 2 ground referenced signal connections figure 2 2 pin assignments table 2 5 signal descriptions table 2 6 G ground referenced signal connections figure 2 2 indirect scanning 1 4 input characteristics A 1 input stage isolated 1 3 inst
17. 2 C14 C18 C20 CH7 through CH0 Negative Input Channels Negative inputs to C24 C26 C30 C32 channels 7 through 0 respectively SCXI 1126 Rear Signal Connector hl Note If you are using the SCXI 1126 with an E Series DAQ device and cable assembly you do not need to read the remainder of this chapter If you are using the SCXI 1180 feedthrough panel the SCXI 1343 rear screw terminal adapter or the SCXI 1351 one slot cable extender with the SCXI 1126 read this section Figure 2 5 shows the pin assignments for the SCXI 1126 rear signal connector These signals are described in the Rear Connector Signal Descriptions section SCXI 1126 User Manual 2 6 ni com Chapter 2 Using the SCXI 1126 AOGND CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 OUTREF NC NC SERDATIN DAQD A SLOTOSEL NC DIG GND NC SERCLK NC NC RSVD NC NC NC OJ BIN Njojo 8 9 10 11 12 13 14 15 16 17 19 18 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 45 44 pas ee 46 47 48 49 50 AOGND CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 NC NC DIG GND SERDATOUT NC NC NC NC SCANCLK NC NC NC NC NC NC NC NC No Connection Figure 2 5 SCXI 1126 Rear Signal Connector Pin A
18. 42 16 kHz 0 0150 0 726 Hz 0 0217 1 160 Hz 0 0418 2 462 Hz 3 20 0 485 32 kHz 0 0150 1 451 Hz 0 0217 2 319 Hz 0 0418 4 924 Hz 6 40 0 970 64 kHz 0 0150 2 902 Hz 0 0217 4 638 Hz 0 0418 9 848 Hz 12 80 1 939 128 kHz 0 0150 5 803 Hz 0 0217 9 276 Hz 0 0418 19 696 Hz 25 60 3 879 Accuracy based on combination of all errors including effects of temperature drift over 20 to 30 C range Noise specifications include effects of PCI 6030E with 1 2 or 5 m SCXI cable assembly National Instruments Corporation A 3 SCXI 1126 User Manual Appendix A Specifications Output Characteristics Filters software programmable TY PC hen ia ot REI NER a 4 pole active lowpass Bandwidth and response time Step Response Settling Time Bandwidth Full Scale Input Step ms 3 dB Hz To 1 To 0 1 To 0 024 1 800 0 1530 0 5300 0 40 30 0 55 0 180 0 320 3 2 7 0 30 0 1000 0 8 1 0 12 Scan interval per channel any frequency range and filter bandwidth 0 012 accuracy 3 Us 0 006 accuracy ssssss 10 us 0 0015 accuracy 20 us Output impedance Multiplexed output mode 100 Q Parallel output mode 330 Q Output short circuit protection Indefinite duration Outputs protected esee CH lt 0 7 gt Includes effects of PCI 6060E with 1 or 2 m SCXI cable ass
19. GND Aims AWG bandwidth C C CH lt 0 7 gt CHAN channel channel clock CHS SCXI 1126 User Manual analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number the resolution of the ADC which is measured in bits An ADC with 16 bits has a higher resolution and thus a higher degree of accuracy than a 12 bit ADC character code that identifies a specific location or series of locations in memory a false lower frequency component that appears in sampled data acquired at too low a sampling rate analog output ground amperes root mean square American Wire Gauge bit one binary digit either 0 or 1 byte eight related bits of data an eight bit binary number Also used to denote the amount of memory required to store one byte of data the range of frequencies present in a signal or the range of frequencies to which a measuring device can respond Celsius analog output channel signals 0 through 7 positive and negative channel select bit pin or wire lead to which you apply or from which you read an analog or digital signal Analog signals can be single ended or differential For digital signals channels are grouped to form ports the clock controlling the time interval between individual channel sampling within a scan Devices with simultaneous sampling do not have this clock chassis bit G 2 National Instruments Corporat
20. OSE 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 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 PRODUCT
21. S 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 Conventions lt gt Pg bold italic monospace monospace bold SCXIbus Slot O 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 DIO 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 When this symbol is marked on the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes paramet
22. SCXI 1126 this allows you to configure filter settings frequency ranges threshold level and threshold hysteresis outside of Measurement amp Automation Explorer MAX Configuring SCXI Using Traditional NI DAQ SCXI 1126 User Manual Use MAX to configure and test the SCXI 1126 If you need help during the configuration process open the MAX Help for Traditional NI DAQ by selecting Help Topics from the Help menu Complete the following steps to configure the SCXI system 1 Double click the Measurement amp Automation Explorer icon on the desktop If you are adding a new module to an already configured chassis go to the Manually Adding and Configuring Modules in Traditional NI DAQ section 2 Adda new chassis to the configured devices and interfaces by right clicking Devices and Interfaces and selecting Create New 1 14 ni com Chapter 1 Installing and Configuring the SCXI 1126 3 Select the appropriate chassis from the list box under Traditional NI DAQ Device and click Finish 4 Configure the chassis a Select a Chassis ID This is an integer value you choose to uniquely identify the chassis for programming and scanning The default Chassis ID starts at 1 and increments as the numbers are used b Selectthe Chassis Address This is needed to address the chassis in a multichassis SCXI system Unless you are using multiple chassis with the same E Series DAQ device select a Chassis Address of zero which is the factory defa
23. SCXl SCXI 1126 User Manual Eight Channel Isolated Frequency Input Module for Signal Conditioning Wy NATIONAL March 2003 Edition P INSTRUMENTS Part Number 321844C 01 Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 Worldwide Offices Australia 61 2 9672 8846 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 Canada Vancouver 514 685 7530 China 86 21 6555 7838 Czech Republic 420 2 2423 5774 Denmark 45 45 76 26 00 Finland 385 0 9 725 725 11 France 33 0 1 48 14 24 24 Germany 49 0 89 741 31 30 Greece 30 2 10 42 96 427 Hong Kong 2645 3186 India 91 80 51190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Malaysia 603 9059 6711 Mexico 001 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 64 09 914 0488 Norway 47 0 32 27 73 00 Poland 48 0 22 3390 150 Portugal 351 210 311 210 Russia 7 095 238 7139 Singapore 65 6 226 5886 Slovenia 386 3 425 4200 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 200 51 51 Taiwan 886 2 2528 7227 United Kingdom 44 0 1635 523545 For further support information refer to the Signal Condition
24. ale ribbon cable rear signal connector 32 pin male DIN C front I O connector SCXI 1126 User Manual A 6 ni com Appendix A Specifications Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth esses 250 V Installation Category II Channel to channel 250 V Installation Category II Environmental Operating temperature e 0 to 50 C Storage temperature esses 20 to 70 C Humidity secet 10 to 90 RH noncondensing Maximum altitude sse 2 000 m Pollution Degree indoor use only 2 Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e EC61010 1 EN 61010 1 e UL3111 1 UL 61010B 1 e CAN CSA C222 No 1010 1 iyi Note For UL and other safety certifications refer to the product label or to ni com Electromagnetic Compatibility Emissions eeeeee EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity ceiros nissernes EN 61326 1997 A2 2001 Table 1 EMCG EM innnan CE C Tick and FCC Part 15 Class A Compliant i Note For EMC compliance operate this device with shielded cabling National Instruments Corporation A 7 SCXI 1126 User Manual Appendix A Specifications CE Compliance This p
25. allation connecting to DAQ device for multiplexed scanning in PXI combination chassis 1 13 in SCXI chassis 1 12 into SCXI chassis 1 11 removing SCXI 1126 from Measurement amp Automation Explorer 1 22 from SCXI chassis 1 23 software installation 1 9 unpacking SCXI 1126 1 10 isolated input stage 1 3 L LabVIEW software 1 8 LabWindows CVI software 1 8 lowpass filter 1 4 SCXI 1126 User Manual l 2 MCHO0 through MCH7 signals table 2 8 Measurement amp Automation Explorer configuration procedure 1 14 manually adding modules 1 18 removing SCXI 1126 1 22 self test verification 1 16 1 18 troubleshooting 1 19 Measurement Studio software 1 8 Module ID register 1 6 multiplexed mode operation connecting to SCXI 1126 for DAQ device in PXI combination 1 13 in SCXI chassis 1 12 multiplexed mode output stage 1 5 multiplexer buffered analog 1 4 0 operation theory See theory of operation output characteristics A 4 output stage multiplexed mode 1 5 parallel mode 1 6 OUTREF signal table 2 8 P parallel mode output stage 1 6 physical specifications A 6 pin assignments front connector table 2 5 rear connector figure 2 7 pin equivalencies SCXIbus to rear connector to DAQ board table 2 9 power up and reset states A 5 pulse generator 1 4 PXI combination chassis 1 13 ni com Index R SERCLK signal description table 2 8 pin equivalencies table 2 9 SERDATIN signal descr
26. an extremely stable onboard reference and calibrates its own A D and D A circuits without manual adjustments by the user a device that converts a physical phenomenon into an electrical signal serial clock signal used to synchronize digital data transfers over the SERDATIN and SERDATOUT lines serial data input signal serial data output signal the amount of time required for a voltage to reach its final value within specified accuracy limits the manipulation of signals to prepare them for digitizing performing frequency division on an external signal slot 0 select signal a measure of the amount of noise seen by an analog circuit or an ADC when the analog inputs are grounded a resistive temperature sensor a temperature sensor created by joining two dissimilar metals The junction produces a small voltage as a function of the temperature the voltage level a signal must reach for a trigger to occur the data measured in bytes s for a given continuous operation calculated to include software overhead a device that converts energy from one form into another a type of signal conditioning that uses external voltages and currents to excite the circuitry of a signal conditioning system into measuring physical phenomena SCXI 1126 User Manual Glossary transfer rate trigger TTL U unipolar update update rate SCXI 1126 User Manual the rate measured in bytes s at which data is moved from source to destination
27. ance temperature detector a metallic probe that measures temperature based on its coefficient of resistivity seconds one or more analog samples taken at the same time or nearly the same time Typically the number of input samples in a scan is equal to the number of channels in the input group For example one scan acquires one new sample from every analog input channel in the group the clock controlling the time interval between scans On devices with interval scanning support for example the AT MIO 16F 5 this clock gates the channel clock on and off On devices with simultaneous sampling for example the EISA A2000 this clock clocks the track and hold circuitry the number of scans a system takes during a given time period usually expressed in scans per second scan clock signal used to increment to the next channel after each E Series DAQ device analog to digital conversion G 6 National Instruments Corporation SCXI SE self calibrating Sensor SERCLK SERDATIN SERDATOUT settling time signal conditioning signal divider SLOTOSEL system noise T thermistor thermocouple threshold throughput rate transducer transducer excitation National Instruments Corporation G 7 Glossary Signal Conditioning eXtensions for Instrumentation single ended a term used to describe an analog input that is measured with respect to a common ground a property of a E Series DAQ device that has
28. d and select the channels to add to the task You can select blocks of channels by pressing the lt Shift gt key while making the selections or individual channels by pressing the lt Ctrl gt key while making the selections If you are creating a channel you can select only one channel Click Next Select the name of the task or channel and then click Finish You can now set the frequency range filter frequency threshold level and threshold hysteresis Frequency Range To set the frequency range complete the following steps 1 Select the channel s you want to configure for frequency range You can select blocks of channels by pressing the lt Shift gt key while making the selections or individual channels by pressing the lt Ctrl gt key while making the selections Under the Settings tab set the input range by entering the Min and Max values Repeat steps and 2 until you have configured all the channels Filter Frequency To set the filter frequency complete the following steps 1 National Instruments Corporation Select the channel s you want to configure for filter frequency You can select blocks of channels by pressing the lt Shift gt key while making the selections or individual channels by pressing the lt Ctrl gt key while making the selections Under the Device tab click the down arrow to set the lowpass filter cutoff frequency and select the desired filter Repeat steps and 2 until you
29. d cable assembly installation guides They explain how to physically connect the relevant pieces of the system Consult these guides when you are making the connections You can download NI documents from ni com manuals Software Programming Choices NI DAQ SCXI 1126 User Manual When programming National Instruments DAQ hardware you can use an NI application development environment ADE or other ADEs In either case you use NI DAQ NI DAQ which shipped with the SCXI 1126 module has an extensive library of functions that you can call from the ADE These functions allow you to use all the features of the SCXI 1126 For more information on these functions refer to the NI DAQ C Function Reference Help NI DAQ carries out many of the complex interactions such as programming interrupts between the computer and the DAQ hardware NI DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to the code Whether you are using LabVIEW LabWindows CVI Measurement Studio VI Logger or other ADEs your application uses NI DAQ To download the latest version of NI DAQ click Download Software at ni com 1 8 ni com Chapter 1 Installing and Configuring the SCXI 1126 National Instruments ADE Software LabVIEW features interactive graphics a state of the art interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Lib
30. e e pr whee teed 1 4 Multiplexed Mode Recommended esses 1 5 Parallel Mode eren enceinte teet um 1 6 Rear Signal Connector SCXIbus Connector and Digital Interface 1 6 Digital Control Circuitry nete ee ode Em 1 6 What You Need to Get Started 42 eo tr e D E tn gabe 1 7 National Instruments Documentation eese eene eene 1 7 Software Programming Choices eese nnne enne 1 8 NI DAQ rue e e RR EG ae eget tes 1 8 National Instruments ADE Software eee 1 9 Installing the Software essential Aisi Ga Se ettet tdt 1 9 Installing the SCXI T126 3 9 iic tret t tette eter it ese tern ee 1 10 Unpackihg 5 oie HAN pande 1 10 Installing the SCXI 1126 Module into the SCXI Chassis 1 11 Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in an SCXI Chassis esses 1 12 Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in a PXI Combination Chassis 1 13 Configuring and Self Testing isisisi inos a aieiai eene nentes 1 14 Configuring SCXI Using Traditional NI DAQ eee 1 14 Manually Adding and Configuring Modules in Traditional NI DAQ 1 16 Verifying and Self Testing the Configuration in Traditional NI DAQ 1 16 Configuring SCXI Using NI DAQm 1 17 Manually Adding and Configuri
31. embly Includes effects of PCI 6030E with 1 or 2 m SCXI cable assembly SCXI 1126 User Manual A 4 ni com Appendix A Specifications Power Up and Reset States Channel Power up Software Hardware Characteristics State Reset State Reset State Output modes Scanning mode Parallel Retains last setting Parallel prior to software reset E Series DAQ device DIFF Retains last setting DIFF connection mode prior to software reset Input frequency range 0 128 kHz 0 128 kHz 0 128 kHz Filter setting 1 Hz 1 Hz 1 Hz Threshold level 0 5 V 0 5 V Retains last setting prior to software reset Hysteresis level OV OV Retains last setting prior to software reset National Instruments Corporation A 5 SCXI 1126 User Manual Appendix A Specifications Stability Recommended warm up time 15 minutes Temperature drift 0 to 20 C 30 to 50 C Inppm Q set 9 ppm of reading 6 4 ppm of range C Temperature Drift Input Frequency Ranges of Reading C Hz C 250 Hz 0 0009 0 002 Hz 500 Hz 0 0009 0 003 Hz 1 kHz 0 0009 0 006 Hz 2 kHz 0 0009 0 013 Hz 4 kHz 0 0009 0 026 Hz 8 kHz 0 0009 0 051 Hz 16 kHz 0 0009 0 102 Hz 32 kHz 0 0009 0 204 Hz 64 kHz 0 0009 0 407 Hz 128 kHz 0 0009 0 814 Hz Calibration cycle sess one year Physical DIMENSIONS endete 17 2 by 20 3 cm 6 8 by 8 0 in I O Connectors iiinis 50 pin m
32. er names 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 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 Bold text in this font denotes the messages and responses that the computer automatically prints to the screen This font also emphasizes lines of code that are different from the other examples Refers to the backplane in the SCXI chassis A signal on the backplane is referred to as the SCXIbus signal name line or signal The SCXIbus descriptor may be omitted when the meaning is clear Slot 0 refers to the power supply and control circuitry in the SCXI chassis Contents Chapter 1 Installing and Configuring the SCXI 1126 About the SCXIE 1120 cei ertet ne utter ertet te d ret dr ete 1 1 Theory of Operation oen a eee dame ees 1 2 Functional OVerVieW eerte te petto eet e eee e ette 1 2 Channel to Channel Isolated Analog Input Stage esee 1 3 Frequency to Voltage Conversion Stage esse 1 4 Analogs Output Stage 5 et e cam
33. es do not successfully configure the SCXI system refer to Appendix B Common Questions for more information SCXI 1126 Configuration Settings This section describes how to set the frequency range filter frequency threshold level and threshold hysteresis of each channel After you have installed and verified the SCXI chassis and SCXI 1126 you can configure the SCXI 1126 Configuring Using Traditional NI DAQ SCXI 1126 User Manual To configure the SCXI 1126 using Traditional NI DAQ complete the following steps 1 Right click the module number containing the SCXI 1126 2 Select Properties 3 Onthe General tab select the E Series DAQ device to which the module connects and the operating mode 4 Onthe Channel tab select the Channel Frequency Range and Filter Frequency and then enter the Threshold Level and Threshold Hysteresis 5 Onthe Accessory tab select the accessory connected to the SCXI 1126 6 Select OK 1 20 ni com Chapter 1 Installing and Configuring the SCXI 1126 Configuring Using NI DAQmx To configure the SCXI 1126 using NI DAQmx complete the following steps 1 2 6 Right click Data Neighborhood and select Create New Select DAQmx Task or DAQmx Channel To configure multiple channels select DAQmx Task Otherwise select DAQmx Channel Click Next Select Analog Input then select Frequency and click Next If you are creating a task keep the Create New Local Channels selecte
34. esis level setting Channel to Channel Isolated Analog Input Stage The input stage of each channel is isolated from the other channels and from the chassis up to 250 V Each channel is also protected from input overvoltages up to 250 V ms powered on or off This stage consists of a trigger circuit that compares the input waveform to a user programmed threshold and hysteresis The programmable range of the threshold is 0 5 to 4 48 V and the programmable range of the hysteresis is O to 4 98 V You can extend these ranges by using an attenuator terminal block For example the SCXI 1327 100 1 high voltage attenuator terminal block extends the threshold range from 50 to 250 V and the hysteresis range from 0 to 250 V The threshold and hysteresis are programmed to create a window with the upper and lower limits given by the formula V window V nreshoia V nysteresis tO V inreshotd where Vinreshold Vhysteresis must be greater than 0 5 V ay Note If you are using Traditional NI DAQ the formula is Vyyindow Vinreshold 9 5 Viysteresis When the input waveform crosses through this window a trigger occurs The frequency of these triggers establishes the frequency to be converted by the frequency to voltage conversion stage National Instruments Corporation 1 3 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Frequency to Voltage Conversion Stage This stage consists of the following A p
35. ew of the SCXI system and contains the most commonly needed information for the modules chassis and software SCXI Chassis Manual Read this manual for maintenance information on the chassis and for installation instructions Your SCXI hardware user manuals 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 the computer Use this documentation for hardware installation and configuration instructions specification information about the DAQ hardware and application hints 1 7 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 e Software documentation You may have both application software and NI DAQ software documentation National Instruments NI application software includes ComponentWorks LabVIEW LabWindows CVI Measure and VirtualBench After you set up the 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 the hardware e Accessory installation guides or manuals If you are using accessory products read the terminal block an
36. ftware SL Note You must install the software before you install the E Series DAQ device You can control the SCXI 1126 in an ADE using NI DAQ The supported ADEs include LabVIEW LabWindows CVI Visual Basic ComponentWorks C and C environments Complete the following steps to install your SCXI 1126 software 1 Install your ADE if you have not already done so NI ADEs have release notes containing software installation instructions National Instruments Corporation 1 9 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 2 Install the latest version of NI DAQ If you do not have the latest version of NI DAQ either download it from ni com or contact an NI sales representative to request it on a CD iyi Note You must uninstall the version of NI DAQ you are using before you update NI DAQ to the current version Installing the SCXI 1126 The following section describes how to install the SCXI 1126 for use with the SCXI chassis and E Series DAQ device yl Note Refer to the Read Me First Radio Frequency Interference document before removing equipment covers or connecting or disconnecting any signal wires Unpacking The SCXI 1126 module is shipped in an antistatic package to prevent electrostatic damage to the module Electrostatic discharge can damage several components in the module To avoid such damage in handling the module take the following precautions e Ground yourself using a grou
37. g single ended configuration which allows the measured signal to be referenced to a ground level with common mode voltage up to 250 Vms Figure 2 1 shows how to connect a ground referenced signal to the SCXI 1126 Figure 2 2 shows how to connect a floating signal and Figures 2 3 and 2 4 show how to AC couple signals to remove unwanted DC components on the SCXI 1126 Figures 2 1 through 2 4 show the signal path from the signal source up to the E Series DAQ device The signal exits the SCXI 1126 and enters the E Series DAQ device which is configured in differential DIFF mode 3 Notes For better noise immunity or to reference floating signal sources connect the negative input channel to the chassis ground as shown in the Optional boxes of Figure 2 2 and Figure 2 3 If the application requires isolation do not connect to chassis ground If you are using the SCXI 1304 or SCXI 1305 terminal block leave the switches in G the ground referenced position when the application requires isolation Placing the switch in F the floating position engages the bias resistor that connects the negative signal CH of each channel together This breaks the channel to channel isolation barrier National Instruments Corporation 2 1 SCXI 1126 User Manual Chapter 2 Using the SCXI 1126 Sensor SCXI Terminal Block SCXI 1126 Module CH d 2 2 Pa zi gt l z CH Vom O High Isolated V Ground
38. hassis Slots Figure 1 2 Installing the SCXI 1126 Module To complete the SCXI 1126 installation follow the procedure in the appropriate sections that follow National Instruments Corporation 1 11 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in an SCXI Chassis In this configuration you can multiplex all eight input channels of the SCXI 1126 into a single channel of the E Series DAQ device Consult the SCXI chassis documentation other SCXI module documentation and E Series DAQ device documentation for additional instructions and cautions You should have already installed the SCXI 1126 module and any other SCXI modules in the chassis according to their installation instructions If you are using more than one SCXI module refer to the SCXI Quick Start Guide to determine to which module to cable the E Series DAQ device To connect the chassis to an E Series DAQ device for multiplexed operation complete the following steps while referring to Figure 1 3 1 Power off the SCXI chassis 2 Power off the computer that contains the E Series DAQ device 3 Insert the cable adapter into the back of the SCXI chassis aligned with the module that you intend to connect to the E Series DAQ device For more information refer to the installation guide for the cable assembly 4 Connect the cable to the back of the cable adapter
39. ing Technical Support Information document To comment on the documentation send email to techpubs ni com 1998 2003 National Instruments Corporation All rights reserved Important Information Warranty The SCXI 1126 is 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 i
40. ion CHSGND CLKOUTEN CMV common mode range common mode signal D A DAC DAQ DAQD A dB DC DC coupled default setting device digital trigger DIGGND DIN National Instruments Corporation G 3 Glossary chassis ground scan clock output enable bit common mode voltage the input range over which a circuit can handle a common mode signal the mathematical average voltage relative to the ground of the computer of the signals from a differential input digital to analog D A converter an electronic device often an integrated circuit that converts a digital number into a corresponding analog voltage or current data acquisition 1 collecting and measuring electrical signals from sensors transducers and test probes or fixtures and processing the measurement data using a computer 2 collecting and measuring the same kinds of electrical signals with A D and or DIO devices plugged into a computer and possibly generating control signals with D A and or DIO devices in the same computer the data acquisition device data address line signal used to indicate whether the SERDATIN pulse train transmitted to the SCXI chassis contains data or address information decibel the unit for expressing a logarithmic measure of the ratio of two signal levels dB 220log o V1 V2 for signals in volts direct current allowing the transmission of both AC and DC signals a default parameter value recorded in the driver
41. iption table 2 8 pin equivalencies table 2 9 rear connector continuous driving of pins note 1 5 pin assignments figure 2 7 SCXIbus to rear connector to DAQ board pin equivalencies table 2 9 signal descriptions table 2 8 SERDATOUT signal registers digital control circuitry 1 6 description table 2 8 removing SCXI 1126 pin equivalencies table 2 9 from Measurement amp Automation signal connections Explorer 1 22 front connector from SCXI chassis 1 23 AC coupled signal connections RSVD signal table 2 8 figure 2 3 analog input channels 2 1 floating AC signal connections S figure 2 3 SCANCLK signal table 2 8 floating signal connections scanning direct and indirect 1 4 figure 2 2 SCXI chassis ground referenced signal connecting SCXI 1126 to DAQ Pommections figure 22 device 1 12 pin assignments table 2 5 installing SCXI 1126 1 10 signal descriptions table 2 6 removing SCXI 1126 1 22 rear connector SCXI 1126 pin assignments figure 2 7 SCXIbus to rear connector to DAQ board pin equivalencies table 2 9 signal descriptions table 2 8 SLOTOSEL signal description table 2 8 pin equivalencies table 2 9 software block diagram 1 2 configuration and self test 1 14 configuration settings 1 20 installation 1 10 overview 1 1 requirements for getting started 1 7 software programming choices National Instruments ADE software 1 9 NI DAQ 1 8 SCXIbus to rear c
42. ith B to quantify data or computer memory megabytes G 4 National Instruments Corporation MIO multiplexed mode mux NC NI DAQ noise NRSE 0 OUTREF P parallel mode peak to peak ppm National Instruments Corporation G 5 Glossary multifunction input output an SCXI operating mode in which analog input channels are multiplexed into one module output so that your cabled E Series DAQ device has access to the multiplexed output of the module as well as the outputs of all other multiplexed modules in the chassis multiplexer a switching device with multiple inputs that sequentially connects each of its inputs to its single output typically at high speeds in order to measure several signals with a single analog to digital converter not connected signal the driver software needed in order to use NI E Series DAQ devices and SCXI components an undesirable electrical signal noise comes from external sources such as AC power lines motors generators transformers fluorescent lights soldering irons CRT displays computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors corrupts signals you are trying to measure nonreferenced single ended mode all measurements are made with respect to a common measurement system reference but the voltage at this reference can vary with respect to the measurement system ground output refe
43. message Failed to find followed by module codes and the message Instead found module with ID OXzz 1 Return to the Manually Adding and Configuring Modules in NI DAQmx section and make sure the correct module is in the specified slot 2 Delete the incorrect module as described in the Removing the SCXI 1126 from Measurement amp Automation Explorer section 3 Add the correct module as described in the Manually Adding and Configuring Modules in NI DA Qmx section National Instruments Corporation 1 19 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 e Ifyou get the message Failed to find followed by a module code and the message Slot x is empty 1 Check to see if the configured module is installed in the specified slot If not install the module by referring to the Installing the SCXI 1126 Module into the SCXI Chassis section 2 Ifthe module is installed in the correct slot power off the chassis 3 Remove the module as specified in the Removing the SCXI 1126 from an SCXI Chassis section 4 Verify that no connector pins are bent on the rear signal connector 5 Reinstall the module as described in the Installing the SCXI 1126 Module into the SCXI Chassis section ensuring the module is fully inserted and properly aligned in the slot After checking the preceding items return to the Verifying and Self Testing the Configuration in NI DAQmx section and retest the SCXI chassis If these measur
44. nding strap or by holding a grounded object e Touchthe antistatic package to a metal part of the plugged in computer chassis before removing the module from the package N Caution Never touch the exposed pins of connectors Remove the module from the package and inspect the module for loose components or any sign of damage Notify NI if the module appears damaged in any way Do not install a damaged module into the SCXI chassis Store the SCXI 1126 module in the antistatic package when not in use SCXI 1126 User Manual 1 10 ni com Chapter 1 Installing and Configuring the SCXI 1126 Installing the SCXI 1126 Module into the SCXI Chassis To install the SCXI 1126 module into the SCXI chassis complete the following steps while referring to Figure 1 2 1 Power off the computer that contains the E Series DAQ device or disconnect it from the SCXI chassis Power off the SCXI chassis Do not insert the SCXI 1126 module into a chassis that is powered on Insert the SCXI 1126 into an open slot in the SCXI chassis Gently guide the module into the slot guides and push it toward the back of the chassis until the front face of the module is flush with the front of the chassis Insert any other SCXI modules into the remaining slots in the same manner as described in step 3 Secure all the SCXI modules to the SCXI chassis using both thumbscrews 1 SCXI Chassis Power Switch 3 SCXI Module Thumbscrews 2 SCXI C
45. nformation National Instruments Corporation 1 5 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Parallel Mode In parallel output mode channel 0 is selected at the output multiplexer and connects to CHO The seven other channels directly connect to CH1 through CH7 respectively on the rear signal connector When the CHO signal is configured as channel 0 output the rear signal connector simultaneously carries each of the outputs of the SCXI 1126 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 An E Series DAQ device cabled to an SCXI 1126 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 an E Series DAQ device directly cabled to the module has access to these outputs SL Note Since the SCXI 1126 provides programmable lowpass filters to average the output signals it is uncommon for a signal to vary faster than 1 kHz so sampling faster than 10 kHz is uncommon Therefore parallel mode is not commonly used but some applications require parallel mode Rear Signal Connector SCXIbus Connector and Digital Interface The SCXIbus controls the SCXI 1126 If the SCXI 1126 is the cabled module the digital interface connects the rear signal connector to the SCXIbus This
46. nformation 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 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 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
47. ng Modules in NI DAQmx 1 18 Verifying and Self Testing the Configuration in NI DAQmx 1 18 Troubleshooting the Self Test Verification 1 19 SCXI 1126 Configuration Settings eene nen eee eene 1 20 Configuring Using Traditional NI DAQ eee 1 20 Configuring Using NI DAQmx eese eene 1 21 Frequency Range o ice ties er Eee n tee edet ENEE 1 21 Filter Frequency a5 eoa eenete eu a ente tape iei e 1 21 National Instruments Corporation V SCXI 1126 User Manual Contents Threshold Level cis cs tet ttm eterne 1 22 Threshold Hysteresis ss oon dete edere 1 22 Removing the SCXI 1126 rete etc etat tette Prater anter Seres 1 22 Removing the SCXI 1126 from Measurement amp Automation Explorer 1 22 Removing the SCXI 1126 from an SCXI Chassis eee 1 23 Chapter 2 Using the SCXI 1126 Signal Connections 5 uote eite e et P HE TE Ra etn tune 2 1 Analog Input Channels 4 eire e pst erem ens 2 1 SCXI 1126 Front Connector esent enne ene 2 4 Front Connector Signal Descriptions 2 6 SCXI 1126 Rear Signal Connector esee 2 6 Rear Connector Signal Descriptions e 2 7 Appendix A Specifications Appendix B Common Questions Glossary Index Figures Figure 1 1 SCXI 1126 Block Diagram rinisin 1 2 Figure 1 2 Installing the SCXI 1126 M
48. odule see 1 11 Figure 1 3 Connecting an SCXI Chassis to an E Series DAQ Device 1 13 Figure 1 4 Removing the SCXI 1126 e 1 24 Figure 2 1 Ground Referenced Signal Connection for the SCXI 1126 with High Common Mode Voltage eee 2 2 Figure 2 2 Floating Signal Connection for the SCXI 1126 Referenced to Chassis Ground for Better Signal to Noise Ratio 2 2 Figure 2 3 Floating AC Coupled Signal Connection for the SCXI 1126 2 3 Figure 2 4 AC Coupled Signal Connection for the SCXI 1126 with High Common Mode Voltage eene 2 3 Figure 2 5 SCXI 1126 Rear Signal Connector Pin Assignments 2 7 SCXI 1126 User Manual vi National Instruments Corporation Contents Tables Table 2 1 Front Signal Pin Assignments eese 2 5 Table 2 2 SCXI 1126 Front Connector Signal Descriptions esse 2 6 Table 2 3 Rear Connector Signal Descriptions ssee 2 8 Table 2 4 SCXIbus to SCXI 1126 Rear Signal Connector to E Series DAQ Device Pin Equivalencies eee 2 9 National Instruments Corporation vii SCXI 1126 User Manual Installing and Configuring the SCXI 1126 This manual describes the electrical and mechanical aspects of the SCXI 1126 module and contains information concerning its installation and operation The SCXI 1126 i
49. onnector to DAQ board pin equivalencies table 2 9 self test verification steps for 1 16 1 18 troubleshooting 1 19 application development environments supported 1 9 installation 1 9 software programming choices National Instruments application software 1 9 NI DAQ 1 8 National Instruments Corporation F3 SCXI 1126 User Manual Index specifications frequency input A 1 input characteristics A 1 output characteristics A 4 physical A 6 power up and reset states A 5 stability A 6 transfer characteristics A 3 stability specifications A 6 T theory of operation block diagram 1 2 digital control circuitry 1 6 digital interface 1 6 frequency to voltage and analog circuitry frequency to voltage conversion stage 1 4 isolated input stage 1 3 multiplexed mode output stage 1 5 SCXI 1126 User Manual output stage 1 4 parallel mode output stage 1 6 functional overview 1 2 rear signal connector 1 6 SCXlIbus connector 1 6 transfer characteristics A 3 troubleshooting self test verification 1 19 U unpacking SCXI 1126 1 10 V verifying and self testing the configuration steps for 1 16 1 18 troubleshooting 1 19 ni com
50. r 1 Installing and Configuring the SCXI 1126 The SCXI system should now operate properly with your ADE software If the test did not complete successfully refer to the Troubleshooting the Self Test Verification section for troubleshooting steps To configure the frequency range filter range threshold level and threshold hysteresis of the SCXI 1126 refer to the SCXI 1126 Configuration Settings section Troubleshooting the Self Test Verification If the Self Test Verification did not verify the chassis configuration check the following items to successfully complete system configuration e Ifyou get the message Unable to test chassis at this time you have not designated at least one module as connected to an E Series DAQ device 1 Return to the Manually Adding and Configuring Modules in NI DAQmx section 2 Changethe configuration of the cabled module in the system from not being connected to connected to device x e Ifyou get the message Failed to find followed by the module codes and the message Unable to communicate with chassis 1 Make sure the SCXI chassis is powered on 2 Make sure the cable between the SCXI chassis and E Series DAQ device is properly connected Inspect the cable connectors for bent pins 4 Make sure you are using the correct NI cable assembly Test the E Series DAQ device to verify it is working properly Refer to the E Series DAQ device user manual for more information e Ifyou get the
51. rary a series of virtual instruments for using LabVIEW with National Instruments DAQ hardware is included with LabVIEW LabWindows CVI is a complete ANSI C ADE that features an interactive user interface code generation tools and the LabWindows CVI Data Acquisition and Easy I O libraries Measurement Studio which includes tools for Visual C and tools for Visual Basic is a development suite that allows you to design test and measurement applications For Visual Basic developers Measurement Studio features a set of ActiveX controls for using National Instruments DAQ hardware These ActiveX controls provide a high level programming interface for building virtual instruments VIs For Visual C developers Measurement Studio offers a set of Visual C classes and tools to integrate those classes into Visual C applications The ActiveX controls and classes are available with Measurement Studio and the NI DAQ software VI Logger is an easy to use yet flexible tool specifically designed for data logging applications Using dialog windows you can configure data logging tasks to easily acquire log view and share your data VI Logger does not require any programming it is a stand alone configuration based software Using LabVIEW LabWindows CVI Measurement Studio or VI Logger greatly reduces the development time for your data acquisition and control application Refer to ni com for more information on these ADEs Installing the So
52. rence signal a type of SCXI operating mode in which the module sends each of its output channels directly to a separate analog input channel of the E Series DAQ device connected to the module a measure of signal amplitude the difference between the highest and lowest excursions of the signal parts per million SCXI 1126 User Manual Glossary R referenced signal sources relative accuracy resolution rms RSE RSVD RTD scan scan clock scan rate SCANCLK SCXI 1126 User Manual signal sources with voltage signals that are referenced to a system ground such as the earth or a building ground Also called grounded signal sources a measure in LSB of the accuracy of an ADC It includes all non linearity and quantization errors It does not include offset and gain errors of the circuitry feeding the ADC the smallest signal increment that can be detected by a measurement system Resolution can be expressed in bits in proportions or in percent of full scale For example a system has 12 bit resolution one part in 4 096 resolution and 0 0244 of full scale resolution root mean square the square root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude referenced single ended mode all measurements are made with respect to a common reference measurement system or a ground Also called a grounded measurement system reserved bit pin or signal resist
53. rent esee Threshold software programmable 1 5 us 5 V 128 kHz TTL pulse train 50 mV min to 250 V max RMS or DC DC or AC with AC coupled terminal block Each input should remain within 250 Vms Of chassis ground or any other input terminal 250 Vims powered on or off CH lt 0 7 gt 50 GQ 0 5 to 4 5 V 50 kQ 250 to 0 5 V and 4 5 to 250 V 50 KQ 500 pA max over operating temperature range 0 5 to 4 48 V 50 to 250 V with SCXI 1327 high voltage attenuator terminal block 1 Voltage is limited to 30 V ms 42 4 V if you are using an SCXI 1305 terminal block SCXI 1126 User Manual A 2 ni com Resolution Hysteresis Transfer Characteristics Appendix A Specifications 8 bits iniu 0 to 4 98 V 0 V to 250 V with SCXI 1327 high voltage attenuator terminal block Accuracy Noise Hz Input of Reading Hz DC to 255 kHz Frequency Ranges 24 Hours 90 Days 1 Year Peak RMS 250 Hz 0 015096 0 011 Hz 0 021796 0 018 Hz 0 041896 0 039 Hz 0 05 0 008 500 Hz 0 015096 0 023 Hz 0 021796 0 036 Hz 0 041896 0 077 Hz 0 10 0 015 1 kHz 0 0150 0 045 Hz 0 0217 0 073 Hz 0 0418 0 154 Hz 0 20 0 030 2 kHz 0 0150 0 091 Hz 0 0217 0 145 Hz 0 0418 0 308 Hz 0 40 0 061 4 kHz 0 0150 0 181 Hz 0 0217 0 290 Hz 0 0418 0 616 Hz 0 80 0 121 8 kHz 0 0150 0 363 Hz 0 0217 0 580 Hz 0 0418 1 231 Hz 1 60 0 2
54. return serial output data from any module to the E Series DAQ device 21 DAQD A Input E Series DAQ device Data Address Line The E Series DAQ device uses this signal to indicate to the module whether the incoming serial stream is data or address information 29 SLOTOSEL Input Slot O Select The E Series DAQ device uses this signal to indicate whether the information on SERDATIN is sent to a module or to the Slot 0 controller 36 SCANCLK Input Scan Clock Indicates to the SCXI 1126 that the E Series DAQ device took a sample and caused the SCXI 1126 to change channels 37 SERCLK Input Serial Clock The E Series DAQ device uses this signal to clock the data on the SERDATIN and SERDATOUT lines 43 RSVD Input Reserved Note All other pins are not connected SCXI 1126 User Manual The digital I O DIO and timing signals of the SCXI 1126 connect to the DIO and timing lines of the E Series DAQ devices as shown in Table 2 4 For more information on these signals consult the E Series DAQ device user manual 2 8 ni com Chapter 2 Using the SCXI 1126 Table 2 4 SCXIbus to SCXI 1126 Rear Signal Connector to E Series DAQ Device Pin Equivalencies National Instruments Corporation SCXI 1126 Rear SCXIbus Line Signal Connector E Series DAQ Device MOSI SERDATIN DIOO D A DAQD A DIO1 INTR SLOTOSEL DIO2 SPICLK SERCLK EXTSTROBE MISO SERDATOUT DIO4 2 9 SCXI 1126 User Manual
55. roduct meets the essential requirements of applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility 89 336 EEC Directive EMC 3 Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product click Declarations of Conformity Information at ni com hardref nsf SCXI 1126 User Manual A 8 ni com Common Questions When I set the individual channel gains programmatically on the SCXI 1126 module each call to scx1 set Gain takes several seconds to return Is this normal behavior This is normal behavior for the SCXI 1126 It takes 3 seconds to settle after a call to SCXI Set Gain For example if you called SCXI Set Gainon 4 channels of the SCXI 1126 it takes about 12 seconds for all the calls to return 3 seconds per channel x 4 channels 12 seconds When I try to manually add and configure my module it is not in the list of modules Why is my module not listed You might have an old version of NI DAQ If you do not have the latest version of NI DAQ you can download it from ni com or contact an NI sales representative to get a CD I have a single SCXI 1126 module in my SCXI chassis If I control it in multiplexed mode I get correct values when I read the channels If I control the module in parallel mode I get values
56. s a member of the NI Signal Conditioning eXtensions for Instrumentation SCXT family of modules Specifically the SCXI 1126 module is designed for signal conditioning of frequency generating sensors and other analog and digital periodic signal sources The SCXI 1126 provides eight isolated frequency input channels and each channel is independently configurable through software This chapter describes the SCXI 1126 lists what you need to get started explains how to unpack the SCXI 1126 and describes the optional software and equipment About the SCXI 1126 The SCXI 1126 signal conditioning module is used in isolating frequency generating sensors and other analog and digital periodic signal sources The SCXI 1126 has eight isolated input channels each with ten selectable input frequency ranges from 250 Hz to 128 kHz along with programmable input threshold and hysteresis functions Each channel also has four selectable 4 pole lowpass filters with cut off frequencies ranging from 1 Hz to 1 kHz The SCXI 1126 operates in two output modes parallel output and multiplexed output In parallel output mode all eight SCXI 1126 channels connect in parallel to eight E Series data acquisition DAQ device channels In multiplexed output mode all eight SCXI 1126 channels are multiplexed into a single E Series DAQ device channel You can multiplex several SCXI 1126 modules into a single channel and greatly increase the number of analog input
57. signals that can be digitized National Instruments Corporation 1 1 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 For easy signal attachment to the SCXI 1126 you can use a terminal block to connect such signal connection options as screw terminals and BNC connectors With the SCXI 1126 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 1126 are listed in Appendix A Specifications Theory of Operation This section contains a functional overview of the SCXI 1126 module and explains the operation of each functional unit making up the SCXI 1126 Functional Overview The block diagram in Figure 1 1 illustrates the key functional components of the SCXI 1126 Comparator with Frequency to E Input Protection Optical Isolation Voltage 8 1 Analog CHO Conversion Multiplexer cHo I Threshold and J J gi c gt o Hysteresis Range Filter m CH1 e bit lt Optical Isolation Settings M Resolution ety 5 por ote E A 2
58. ssignments Rear Connector Signal Descriptions SCXI 1126 rear connector signal descriptions are listed in Table 2 3 For more information on differential DIFF referenced single ended RSE or nonreferenced single ended NRSE modes go to ni com info and enter rdfwnc National Instruments Corporation 2 7 SCXI 1126 User Manual Chapter 2 Using the SCXI 1126 Table 2 3 Rear Connector Signal Descriptions Pin Signal Name Direction Description 1 2 AOGND Output Analog Output Ground These pins are software programmed to connect to the analog reference when the SCXI 1126 is in RSE mode 3 18 CHO through Output Analog Output Channels 0 through 7 These pins connect to the CH7 E Series DAQ device DIFF analog input channels In DIFF mode CH0 through CH7 are software programmed to connect to the analog reference power on and reset state 19 OUTREF Output Output Reference This pin is software programmed to connect to the analog reference when the SCXI 1126 is in NRSE mode Connect it to the analog input sense pin of the E Series DAQ device in NRSE mode 24 33 DIG GND Digital Ground These pins supply the reference for E Series DAQ device digital signals and connect to the SCXI 1126 digital ground 25 SERDATIN Input Serial Data In The E Series DAQ device uses this signal to program modules in all slots 26 SERDATOUT Output Serial Data Out The cabled module uses this signal to
59. st of installed devices and interfaces by clicking the next to the Devices and Interfaces icon If the SCXI 1126 is configured under NI DAQmx remove the module under NI DAQmx Devices If the SCXI 1126 is configured under Traditional NI DAQ remove the module under Traditional NI DAQ Devices Locate the chassis in the list of installed devices Display the list of modules in the chassis by clicking the next to the Chassis icon Right click the module or chassis you want to delete and click Delete You are presented with a confirmation window Click Yes to continue deleting the module or chassis or No to cancel this action 1 22 ni com Chapter 1 Installing and Configuring the SCXI 1126 ER Note Deleting the SCXI chassis deletes all modules in the chassis All configuration information for these modules is also lost The SCXI chassis and or SCXI module s should now be removed from the list of installed devices in MAX Removing the SCXI 1126 from an SCXI Chassis Consult the documentation for an SCXI chassis or PXI SCXI combination chassis and accessories for additional instructions and cautions To remove the SCXI 1126 module from an SCXI chassis complete the following steps while referring to Figure 1 4 1 Power off the SCXI chassis Do not remove the SCXI 1126 module from a chassis that is powered on 2 Ifthe SCXI 1126 is the cabled module disconnect the cable running from the SCXI 1126 to the E Series DAQ device Remo
60. teps after opening MAX 1 Verify that the chassis power is on and is correctly connected to an E Series DAQ device 2 Display the list of devices and interfaces by clicking the next to the Devices and Interfaces icon 3 From the list that appears under Traditional NI DAQ Devices locate the chassis you want to test Right click the chassis and click Test 4 Ifthe communication test is successful a message The Chassis has been Verified appears Click OK 1 16 ni com Chapter 1 Installing and Configuring the SCXI 1126 The SCXI system should now operate properly with your ADE software If the test did not complete successfully refer to the Troubleshooting the Self Test Verification section for troubleshooting steps To configure the frequency range filter range threshold level and threshold hysteresis of the SCXI 1126 refer to the SCXI 1126 Configuration Settings section Configuring SCXI Using NI DAQmx Use MAX to configure and test the SCXI 1126 If you need help during the configuration process open the MAX Help for NI DAQmx by selecting Help Topics from the Help menu Complete the following steps to configure the SCXI system 1 National Instruments Corporation Double click the Measurement amp Automation Explorer icon on the desktop Click the next to the Devices and Interfaces icon If you are adding modules to an already configured chassis go to the Manually Adding and Configuring Modules in NI DAQm
61. that are not scaled back after the gain How do I correct this problem You saw incorrect values in parallel mode because you did not reconfigure NI DAQ to control the SCXI 1126 module in parallel mode You can do this by launching MAX and selecting the SCXI 1126 module Right click the SCXI 1126 module and select Properties Select the E Series DAQ device that connects to the SCXI 1126 module and choose Parallel for the mode You also must tell NI DAQ the gain to use for each channel Once you have completed the configuration NI DAQ changes the mode of the chassis and turns the SCXIbus off This links the SCXI 1126 module to the E Series DAQ device ER Note Any other modules you add to the chassis in this configuration are ignored No communication is made to them from that E Series DAQ device If you are still having problems contact NI at ni com support National Instruments Corporation B 1 SCXI 1126 User Manual Glossary Symbol Prefix Value p pico 10 12 n nano 107 u micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 109 Symbols E degree Q ohm per percent positive of or plus negative of or minus A amperes A D analog to digital AC alternating current AC coupled allowing the transmission of AC signals while blocking DC signals O National Instruments Corporation G 1 SCXI 1126 User Manual Glossary ADC ADC resolution address alias AO
62. tional Instruments Corporation 1 13 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 the SCXI 1126 module and any other SCXI modules in the chassis according to their installation instructions To use the SCXI 1126 module in multiplexed mode with an E Series DAQ device in a PXI combination chassis complete the following steps 1 Nocables are required between the SCXI 1126 and the E Series DAQ device if the PXI E Series DAQ device is installed in the right most PXI slot You can configure this device to control the SCXI system using an internal bus that connects the PXI chassis to the SCXI chassis If the E Series DAQ device for controlling the SCXI system is not installed in the right most slot of the PXI combination chassis assemble the system as described in the Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in an SCXI Chassis section 2 Poweron the SCXI portion of the PXI combination chassis You should have already installed the appropriate software Refer to the Configuring and Self Testing section to configure the SCXI 1126 for multiplexed mode operation Configuring and Self Testing You can configure an SCXI system under Traditional NI DAQ Devices or NI DAQmx Devices NI recommends using NI DAQmx Devices whenever possible because of the features available in NI ADE software Using NI DAQmx allows you to set up property nodes accessible in NI ADE software When using the
63. ulse generator which triggers on the incoming frequency to produce a pulse per frequency cycle with a precisely controlled pulse width that is set by the input frequency range A 1 bit DAC which uses a stable voltage reference to translate the amplitude of the pulse train to the output voltage range A programmable 4 pole active lowpass filter which averages the output of the 1 bit DAC to produce a clean analog voltage proportional to the input frequency You can program the filter to any of four bandwidths 1 Hz 40 Hz 320 Hz or 1 kHz This added flexibility allows you to reduce the channel response time by selecting a higher filter bandwidth for input frequencies that exceed the minimum recommended value for the selected filter bandwidth The minimum recommended input frequency for each filter bandwidth is listed in Appendix A Specifications 3 Note Because of the low bandwidths of the output filters you must wait approximately 3 s after changing any of the settings to allow the channels to settle before you can take an accurate measurement NI DAQ automatically queries the module to determine when the module outputs have settled Analog Output Stage The output stage consists of the following A buffered analog multiplexer which multiplexes the outputs of all eight channels to a buffer The buffer output connects directly to CHO on the rear signal connector The analog bus switch circuitry which can route the buffer output to
64. ult setting of all SCXI chassis A chassis address of zero is indicated by setting all of the chassis address DIP switches to the OFF position If you are using multiple chassis or one or more of the chassis address DIP switches is not in the OFF position refer to the SCXI Chassis User Manual for further information c If you are using a PXI 1010 or PXI 1011 chassis select the Controlling SCXI with internal bus checkbox if you are communicating directly with the SCXI portion of the chassis without external cabling d Click Next 5 You can now choose to automatically detect which modules are installed in the chassis or you can manually add them Click Next if you selected Yes and Finish if you selected No If you selected No go to the Manually Adding and Configuring Modules in Traditional NI DAQ section 6 Ifyou selected auto detection select the communication path and click Next 7 Select the cabled module by clicking the module in the list box and clicking Finish You have completed configuring the SCXI 1126 using Traditional NI DAQ National Instruments Corporation 1 15 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Manually Adding and Configuring Modules in Traditional NI DAQ If you did not auto detect the SCXI modules you must manually add and configure each of the modules Complete the following steps to manually add modules 1 Click the next to Devices and Interfaces Traditional
65. ve any terminal block that connects to the SCXI 1126 4 Rotate the thumbscrews that secure the SCXI 1126 to the chassis counter clockwise until they are loose but do not completely remove the thumbscrews 5 Removethe SCXI 1126 by pulling steadily on both thumbscrews until the module slides completely out National Instruments Corporation 1 23 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 1 Cable 4 Terminal Block 2 SCXI 1126 5 SCXI Chassis Power Switch 3 SCXI Module Thumbscrews 6 SCXI Chassis Figure 1 4 Removing the SCXI 1126 SCXI 1126 User Manual 1 24 ni com Using the SCXI 1126 This chapter describes the input and output signal connections and includes specifications and connection instructions to the SCXI 1126 module using the SCXI 1126 front connector and rear signal connector Signal Connections If you are using a terminal block with the SCXI 1126 refer to the terminal block installation guide documentation for signal connection information This section provides information about various signal types such as floating ground referenced signals with or without high common mode voltage and signals with or without unwanted DC components and how to connect them Analog Input Channels Each input channel pair corresponds to a separate frequency input channel andis fully isolated from the other inputs and from earth ground The inputs are designed in a floatin
66. x section Add a new chassis to the configured devices and interfaces by holding down the right mouse button on NI DAQmx Devices and selecting Create New DAQmx Device Select NI DAQmx SCXI Chassis Select the appropriate chassis from the pull down menu Configure the chassis a Select the Chassis Communicator that is connected to the SCXI chassis b Select the Communicating SCXI Module Slot c Select the Chassis Address You can now choose to automatically detect which modules are installed in the chassis or you can manually add them by selecting or clearing the Auto Detect Modules checkbox Left click Save and go to step 1 in the Manually Adding and Configuring Modules in NI DAQmx section to complete configuration 1 17 SCXI 1126 User Manual Chapter 1 Installing and Configuring the SCXI 1126 Manually Adding and Configuring Modules in NI DAQmx You must add and configure each of the modules in the Chassis Configuration window If you are not in the Chassis Configuration window right click on the chassis in which the module is installed and select Properties Complete the following steps to manually add modules 1 Left click the down arrow in the module column corresponding to the slot where the added module is located If the appropriate module name does not appear on the list refer to Appendix B Common Questions 2 Left click the down arrow in the Accessory column to select the appropriate accessory on the module

SCXI-1126 User Manual - National Instruments

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