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SCXI-1102/B/C User Manual

1. 100 uV Gain error relative to calibration reference Gain 1 After calibration 0 015 of reading max Before calibration 0 04 of reading National Instruments Corporation A 1 SCXI 1102 B C User Manual Appendix A Specifications SCXI 1102 B C User Manual Gain 100 After calibration eee 0 020 of reading max Before calibrati0n 0 1 of reading Amplifier Characteristics Input impedance Normal powered on eee gt 1 GQ Powered Of arsi ennan e 10 KQ Overl0ad onanan 10 KQ Input bias current ee eee eects 0 5 nA Input offset current 0 eee 1 0nA CMRR Characteristics 1102 1102B 1102C 50 to 60 Hz either gain 110 dB 90 dB 90 dB DC gain 1 75 dB min 75 dB min 75 dB min DC gain 100 100dB min 100dBmin 100 dB min Output range 0 eee ee eee eee eeeseeeeees 10 V Output impedance eee 910 Dynamic Characteristics Bandwidth 2 Hz 1102 200 Hz 1102B 10 kHz 1102C Minimum scan interval per channel any gain 0 012 accuracy oe eee 3 us 0 0061 accuracy seses 10 us System noise RTI Characteristics 1102 1102B 1102C Gain 1 50 UVims 50 UVims 70 UV ims Gain 100 5 UV ims 5 UV ims 10 UV mms A 2 ni com Appendix A Specifications Filters Cutoff frequency 3 dB eee 2 Hz 1102 200 Hz 1102B 10 KHz 1102C NMR lt 60 H
2. o O a ile Rbias Front Signal onnector e Make This Connection to Ground gt Reference CH 31 the Signal Lo CH GND O E w tard Referenced to Chassis Ground SCXI 1102 B C Figure 2 2 Floating Signal Connection Referenced to Chassis Ground Cold Junction Sensor Connection Pins A3 and A4 CJ SENSOR connect the temperature sensor located on the SCXI 1300 or SCXI 1303 terminal blocks to the SCXI 1102 B C module The CJ SENSOR signal is measured relative to CH GND Pins A3 and A4 are connected within the SCXI 1102 B C module so the position of the MTEMP DTEMP jumper on the SCXI 1300 or SCXI 1303 does not matter The input is overvoltage protected to 15 VDC with power on and off Caution Exceeding the overvoltage protection on the CJ SENSOR input can damage the SCXI 1102 B C module the SCXIbus and the DAQ device NI is not liable for any damages or injuries resulting from such signal connections Rear Signal Connector Table 2 3 shows the SCXI 1102 B C module rear signal connector pin assignments SCXI 1102 B C User Manual 2 6 ni com Chapter 2 Connecting the Signals Table 2 3 Rear Signal Pin Assignments Rear Connector Diagram Signal Name Pin Number Pin Number Signal Name AI
3. 410 0 0 7 NC AT25 AT25 3 O O O 6 NC AI 26 AI 26 2 O O O 4l 6 6 5 CH GND AI27 AI27 o 4 CJ SENSOR AI 28 AI 28 iia 3 CJ SENSOR AT29 A129 2 CH GND AI30 AI 30 1 5 V AI31 AI31 SCXI 1102 B C User Manual 2 2 ni com Chapter 2 Connecting the Signals Front Connector Signal Descriptions Table 2 2 Front Connector Signals Pin Signal Name Description Al 5 V 5 VDC Source Used to power the temperature sensor on the terminal block 0 2 mA of source not protected A2 A5 A16 A24 CH GND Chassis Ground Tied to the SCXI chassis A32 A3 A4 CJ SENSOR Cold junction Temperature Sensor Input Connects to the temperature sensor of the terminal block B1 B32 AI 31 through AI 0 Negative Input Channels Negative side of differential input channels C1 C32 AI 31 through AI 0 Positive Input Channels 31 through 0 Positive side of differential input channels Note All other pins are not connected Analog Input Signal Connections The signal terminals for the negative input channel are located in column B of the connector The signal terminal for each corresponding positive input channel is located in column C of the connector Each input goes to a separate filter and amplifier that is multiplexed to the module output buffer If the terminal block has a temperature sensor the sensor output connected to pins A3 and A4 CJ SENSOR is also filtered
4. Self Test Verification section and retest the SCXI chassis If these measures do not successfully configure the SCXI system contact NI Refer to the Technical Support Information document for contact information National Instruments Corporation 1 7 SCXI 1102 B C User Manual Chapter 1 About the SCXI 1102 B C Troubleshooting in Traditional NI DAQ Legacy SCXI 1102 B C User Manual e Ifyou get the message Unable to test chassis at this time you have not designated at least one module as connected to a E Series DAQ device Refer to the Traditional NI DAQ Legacy section of Chapter 3 Configuring and Testing and change the configuration of the cabled module in the system from Connected to None 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 take the following troubleshooting actions Make sure the SCXI chassis is powered on Make sure the cable between the SCXI chassis and E Series DAQ device is properly connected Inspect the cable connectors for bent pins 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 help file for more information e Ifyou get the message Failed to find followed by module codes and the message Instead found module with ID 0Xxx refer to the Traditional NI DAQ Legacy section o
5. Refer to the LabVIEW Measurements Manual for more information and for proper formatting of channel strings for different uses National Instruments Corporation 3 7 SCXI 1102 B C User Manual Theory of Operation This section includes a brief overview and a detailed discussion of the circuit features of the module Refer to Figure 4 1 while reading this section 3 ez Cit Ow Oa E gt gt CHO y E az x 2 HE gt HO 3 uy ES ae AO GND Q E A A g TH D a OUT REF 5 3 gt ES gt na au Go A CH 31 Front Signal Connector CH 31 Input Protection and Lowpass Filter Gain 31 Gain Digital Register Control B Filter Calibration EEPROM Figure 4 1 SCXI 1102 B C Module Block Diagram SCXIbus Connector CJSENSOR a Input Protection 3 ii Y D o 3 6 1 he E o The major components of the SCXI 1102 B C modules are as follows e Rear signal connector SCxXIbus connector e SCXIbus interface National Instruments Corporation 4 1 SCXI 1102 B C User Manual Chapter 4 Theory of Operation e Digital control circuitry e Analog circuitry The SCXI 1102 B C modules consist of 32 multiplexed input channels each with a software programmable gain of 1 or 100 Each input channel has its own lowpass filter The SCXI 1102 B C modules also have a digital
6. SCXI 1102C a three pole lowpass filter with a 10 kHz cutoff frequency You can multiplex several SCXI 1102 B C modules and other SCXI modules into a single channel on the DAQ device greatly increasing the number of analog input signals that you can digitize Detailed specifications of the SCXI 1102 B C modules are listed in Appendix A Specifications O National Instruments Corporation 1 1 SCXI 1102 B C User Manual Chapter 1 About the SCXI 1102 B C What You Need to Get Started To set up and use the SCXI 1102 B C module you need the following O Hardware At least one of the following modules e SCXI 1102 e SCXI 1102B SCXI 1102C At least one of the following terminal blocks e SCXI 1300 e SCXI 1303 e SCXI 1308 SCXI 1310 e TC 2095 e TBX 1303 e TBX 96 An SCXI chassis or PXI SCXI combination chassis One of the following e E M Series DAQ device SCXI 1600 A computer if using an SCXI chassis Cabling cable adapter and sensors as required for your application O Software SCXI 1102 B C User Manual NI DAQ One of the following software packages e LabVIEW e Measurement Studio LabWindows CVI 1 2 ni com Chapter 1 About the SCXI 1102 B C Documentation Read Me First Safety and Radio Frequency Interference DAQ Getting Started Guide SCXI Quick Start Guide SCXI 1102 B C User Manual Terminal block installation guide for your application Doc
7. D 2 dimensions figure A 4 documentation 1 3 features and overview 1 1 getting started 1 2 hardware 1 2 major components 4 1 measurements 3 2 SCXI 1102 B C User Manual Index module block diagram figure 4 1 multiplexed scanning steps 5 16 multiplexing 4 3 removing C 1 figure C 2 software 1 2 software installation verifying 1 5 typical program flow with Traditional NI DAQ Legacy figure 5 14 using 5 1 LabWindows CVI to create code 5 11 Measurement Studio to create code 5 12 virtual channel string 5 15 SCXIbus connector 4 2 interface 4 2 self test verification troubleshooting 1 6 D 1 SER CLK signal table 2 7 SER DATA IN signal table 2 7 SER DATA OUT signal table 2 7 signal connection floating referenced to chassis ground figure 2 6 ground referenced figure 2 5 signal connections analog input 2 3 digital signals table D 2 front connector pin assignments table 2 2 signals verifying 3 5 NI DAQmx 3 6 Traditional NI DAQ Legacy 3 6 using virtual channel 3 6 SCXI 1102 B C User Manual 1 6 software installation SCXI 1102 B C verifying 1 5 LabVIEW 1 2 LabWindows CVI 1 2 Measurement Studio 1 2 NI DAQ 1 2 NI DAQ version required D 1 SCXI 1102 B C 1 2 using for multiplexed scanning 5 15 specifications analog input A 1 environmental A 4 filters A 3 maximum working voltage A 4 physical A 4 power requirements A 3 stability A 3 specifying cha
8. NI recommends creating a task programmatically if you need explicit control of programmatically adjustable properties of the DAQ system Programmatically adjusting properties for a task created in the DAQ Assistant overrides the original or default settings only for that session The changes are not saved to the task configuration The next time you load the task the task uses the settings originally configured in the DAQ Assistant Adjusting Timing and Triggering There are several timing properties that you can configure through the DAQ Assistant or programmatically using function calls or property nodes If you create a task in the DAQ Assistant you can still modify the timing properties of the task programmatically in your application When programmatically adjusting timing settings you can set the task to acquire continuously acquire a buffer of samples or acquire one point at a National Instruments Corporation 5 3 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C time For continuous acquisition you must use a while loop around the acquisition components even if you configured the task for continuous acquisition using MAX or the DAQ Assistant For continuous and buffered acquisitions you can set the acquisition rate and the number of samples to read in the DAQ Assistant or programmatically in your application By default the clock settings are automatically set by an internal clock based on the requested sampl
9. section for automatic control of channel scanning temperature sensor selection and gain selection Rear Signal Connector SCXIbus Connector and SCXIbus Interface The SCXIbus controls the SCXI 1102 B C module The SCXIbus interface connects the rear signal connector to the SCXIbus allowing a DAQ device to control the SCXI 1102 B C module and the rest of the chassis Digital Control Circuitry The digital control circuitry consists of the Address Handler and registers that are necessary for identifying the module starting calibration information setting the gain and selecting the appropriate channel Analog Circuitry The analog circuitry per channel consists of a lowpass filter and an amplifier with a software selectable gain of 1 or 100 The CJ SENSOR channel also has a buffered lowpass filter but has no amplifier The channels and CJ SENSOR are multiplexed to a single output buffer Analog Input Channels Each of the 32 analog input channels feeds to a separate amplifier with a programmable gain of 1 or 100 Then the signal passes through a fixed lowpass filter 3 Note Because of the 2 Hz bandwidth of the SCXI 1102 module input channels after changing the gains you must wait approximately 3 s for the channels settle in order to get an accurate measurement NI DAQ automatically accounts for this time and determines when the module output has settled For the SCXI 1102B and SCXI 1102C modules this time is approximately
10. 100 ms and 1 ms respectively SCXI 1102 B C User Manual 4 2 ni com Chapter 4 Theory of Operation The CJ SENSOR input channel is used to read the sensor temperature from the terminal blocks that have one such as the SCXI 1300 and SCXI 1303 The temperature sensor is for cold junction compensation thermocouple measurements The CJ SENSOR channel also passes through a 2 Hz lowpass filter to reject unwanted noise on the SCXI 1102 B C Along with the other 32 input channels the CJ SENSOR is multiplexed to the output buffer where it can be read by the DAQ device Theory of Multiplexed Operation The SCXI 1102 B C operates in multiplexed mode which means that all input channels of the SCXI module are multiplexed into a single analog input channel of the E M Series DAQ device Multiplexed mode operation is ideal for high channel count systems The power of SCXI multiplexed mode scanning is its ability to route many input channels to a single channel of the E M Series DAQ device The multiplexing operation of the analog input signals is performed entirely by multiplexers in the SCXI modules not inside the E M Series DAQ device or SCXI chassis The SCXI 1102 B C scanned channels are kept by the NI DAQ driver in a scan list Immediately prior to a multiplexed scanning operation the SCXI chassis is programmed with a module scan list that controls which module sends its output to the SCXIbus during a scan through the cabled SCXI module The
11. 1102 B C User Manual 5 4 ni com Chapter 5 Using the SCXI 1102 B C Table 5 1 NI DAQmx Voltage Measurement Properties Continued Property Short Name Description Analog Input General Properties ALRNG Low Specifies the lower limit of the Advanced Range Low E M Series DAQ device input range in voltage Analog Input General Properties Al Gain Specifies a gain factor to apply to Advanced Gain and Offset Gain Value the signal conditioning portion of the channel Table 5 2 NI DAQmx Thermocouple Measurement Properties Property Short Name Description Analog Input Temperature Al Thermcpl Type Specifies the type of thermocouple Thermocouple Type connected to the channel Analog Input Temperature Al Thermcpl CJCSre Indicates the source of Thermocouple CJC Source cold junction compensation read only Analog Input Temperature Al Thermcpl CJCVal Specifies the temperature of the Thermocouple CJC Value cold junction if the CJC source is constant value Analog Input Temperature AL Thermcpl CJCChan Indicates the channel that acquires Thermocouple CJC Channel the temperature of the cold read only junction if CJC is channel Analog Input Temperature Al ForceReadFromChan Specifies whether to return the Advanced Force Read From reading from the CJC channel Channel during a read operation Table 5 3 NI DAQmx RTD Measurement Properties Proper
12. Creating a Virtual Channel eee eee ceceeseeeeeeeceeeeseeeeeeseeneenaeees 3 5 Verifying the Sima cuco ria ia 3 5 Verifying the Signal in NI DAQmx Using a Task or Global Channel 3 6 Verifying the Signal in Traditional NI DAQ Legacy oocooconcccoccnnncnncnnncanonnnon 3 6 Verifying the Signal Using Virtual Channel 0 0 00 eects 3 6 Verifying the Signal Using Channel Strings eee 3 7 Chapter 4 Theory of Operation Rear Signal Connector SCXIbus Connector and SCXIbus Interface eee 4 2 Digital Control Circuitry cuna aii 4 2 Amalos CIU tidad evsupeesd sSbeuees Nesseveusbaedeecpos 4 2 Analog Input Channel sec cs t seca divin anena a ana ae AESF EE sos aaa ida 4 2 Theory of Multiplexed Operation eee eseseeessecseceseeseeeseceeceseeseeeseceeeeaesseeeaeeeees 4 3 Chapter 5 Using the SCXI 1102 B C Developing Your Application in NEDAQMX cooconoconcncononnncnnnonnnononnncnnonnnonnonnnonncnnncnncrnno 5 1 Typical Program PlOW Cart sssi coeesccocbecvessts tdt tidad 5 1 General Discussion of Typical Flowchart ooooncnnnnncnnnnnnnnnonconcnancononnncnnonanon 5 3 Creating a Task Using DAQ Assistant or Programmatically 5 3 Adjusting Timing and Triggering cononocnonnnonnonnnoncnanonacanonanonncnnnnnnons 5 3 Configuring Channel Properties oooonccocnonnnonnnoncnnnonnnancnncrnncnncrnncnnono 5 4 Acquiring Analyzing and Presentidg oononncnnnnnnnnnonconnnoncnnncnncnncnnnono 5 7 Completing the Application ee e
13. DAQ functions 5 16 cables custom 2 1 calibration SCXI 1102 B C 5 18 CH 0 signal table 2 7 CH 0 signal multiplexing 2 8 CH 0 signal table 2 7 CH GND signal 2 6 front connector signals table 2 3 front signal pin assignment table 2 2 channel properties configuring 5 4 channel scanning See multiplexed scanning channel strings verifying signals 3 6 channels voltage measurement flowchart figure 5 2 SCXI 1102 B C User Manual Index circuitry analog 4 2 digital control 4 2 CJ SENSOR signal 2 6 front connector signals table 2 3 front signal pin assignment table 2 2 CJC source value 3 1 cold junction sensor connection 2 6 common questions D 1 common software configurable settings CJC source value 3 1 gain input range 3 1 configuration 3 1 channel properties 5 4 SCXI 1102 B C common software settings 3 1 settings in MAX NI DAQmx 3 2 creating a global channel or task 3 3 Traditional NI DAQ Legacy 3 4 configuring module property pages 3 4 creating a virtual channel 3 5 troubleshooting self test verification 1 6 verifying signal 3 5 NI DAQm x 3 6 Traditional NI DAQ Legacy 3 6 using virtual channel 3 6 configuration and testing 3 1 configuration settings gain input range 3 1 configuring channel properties 5 4 connecting current loop receivers 2 9 RTDs 2 9 thermocouples 2 9 connecting SCXI 1102 B C to E M Series DAQ device See E M Series DAQ devices connections
14. Fahrenheit a temperature measurement scale 2 farad a measurement unit of capacitance First in first out memory buffer the first data stored is the first data sent to the acceptor FIFOs are often used on DAQ devices to temporarily store incoming or outgoing data until that data can be retrieved or output A type of signal conditioning that allows you to remove unwanted frequency components from the signal you are trying to measure Full scale range Feet Gain The factor by which a signal is amplified sometimes expressed in decibels Ground SCXI 1102 B C User Manual Glossary VO ID in input damage level L lowpass filter MB MIO MISO MOSI max min SCXI 1102 B C User Manual 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 Identifier Inch or inches The highest voltage level that you can apply to the module without damaging it A filter that passes signals below a cutoff frequency while blocking signals above that frequency Meters Megabytes of memory Multifunction I O Master in slave out signal Master out slave in signal Maximum 1 Minutes 2 minimum G 6 ni com multiplex mutliplexed mode NC NI DAQ noise nonlinearity 0 OUT OUT RE
15. VI or in an existing VI 3 Open the block diagram view 4 From the Functions toolbox select All Functions NI Measurements DA Qmx Data Acquisition and select DAQmx Channel Property Node 5 The ActiveChans property is displayed by default This allows you to specify exactly what channel s you want to configure If you want to configure several channels with different properties separate the lists of properties with another Active Channels box and assign the appropriate channel to each list of properties 3 Note If you do not use Active Channels the properties are set on all of the channels in the task O National Instruments Corporation 5 9 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C 6 Right click ActiveChans and select Add Element Left click the new ActiveChans box Navigate through the menus and select the property you wish to define 7 Change the property to read or write to either get the property or write a new value Right click the property go to Change To and select Write Read or Default Value 8 After you have added the property to the property node right click the terminal to change the attributes of the property add a control constant or indicator 9 To add another property to the property node right click an existing property and left click Add Element To change the new property left click it and select the property you wish to define ay Note Refer to the LabVIEW Help fo
16. ad Right click Data Neighborhood and select Create New Select Traditional NI DAQ Virtual Channel and click Finish Select Analog Input from the drop down menu and click Next Enter the Channel Name and Channel Description and click Next Select one of the following measurement types from the drop down menu e Voltage X Thermocouple XRTD Current Click Next The next windows ask for information that is dependent upon the selection made in step 5 Supply the needed information and click Next as needed Click Finish Verifying the Signal This section describes how to take measurements using test panels in order to verify signal and configuring and installing a system in NI DAQmx and Traditional NI DAQ Legacy O National Instruments Corporation 3 5 SCXI 1102 B C User Manual Chapter 3 Configuring and Testing Verifying the Signal in NI DAQmx Using a Task or Global Channel You can verify the signals on the SCXI 1102 B C using NI DAQmx by completing the following steps 1 2 3 4 Coe ea Oy a Click next to Data Neighborhood Click next to NI DAQm x Tasks Click the task Select the channel s you want to verify You can select a block of channels by holding down the lt Shift gt key or multiple channels by holding down the lt Ctrl gt key Click OK Enter the appropriate information on the Settings tab Click the Test button Click the Start button After you have completed verifying
17. and multiplexed to the module output buffer The differential input signal range of an SCXI 1102 B C module input channel is 10 V when using a gain of 1 or 0 1 V when using a gain of 100 This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs The common mode input signal range of an SCXI 1102 B C module input channel is 10 V This common mode input range for either positive or negative channel input is the maximum input voltage that results in a valid measurement Each channel includes input protection circuitry to withstand the accidental application of voltages up to 42 VAC peak or 60 VDC O National Instruments Corporation 2 3 SCXI 1102 B C User Manual Chapter 2 Connecting the Signals A Cautions Exceeding the input damage level 42 VAC peak or 60 VDC between input channels and chassis ground can damage the SCXI 1102 B C module the SCXIbus and the DAQ device NI is not liable for any injuries resulting from such signal connections Applying a voltage greater than 42 VAC peak or 60 VDC to the SCXI 1102 B C is an electrical shock hazard NI is not liable for any damages or injuries resulting from such voltage application ay Note Exceeding the differential or common mode input channel ranges results in a distorted signal measurement and can also increase the settling time requirement of the connected E M Series DAQ device SCXI 1102 B C User Manual Ground Re
18. chassis mdz is the slot position where the module is located with z being the particular slot number The slots in a chassis are numbered from left to right starting with 1 National Instruments Corporation B 1 SCXI 1102 B C User Manual Appendix B Using SCXI Channel Strings with Traditional NI DAQ Legacy 7 0 or Later channels is the list of channels that are scanned for module z It can have several formats obx scy mdz nx where nxis a single input channel obx scy mdz n0 n2 where n0 n2are individual input channel that are not necessarily sequential obx scy mdz n0 n3 where n0 and n3 represent an ascending sequential list of input channels inclusive obx scy mdz n0 n2 n3 n4 nl n5 n2 where n0 n2 and n5 represent single channels not necessarily sequential and n3 and n4 represent the endpoints of an ascending sequential list of channels inclusive In this case channels n1 and n2 are explicitly repeated in the channel list May Note Using parenthesis surrounding multiple channels in a channel string is important for correct scanning operation of the SCXI channels In a single chassis system the obx specifier is optional and causes the gains on the module and E Series DAQ device to be automatically set to fit the input limits parameter When this specifier is omitted the default gain on the E Series DAQ device usually the lowest gain is used but the SCXI 1102 B C gain is adjust
19. clock this signal taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 43 46 RSVD RSVD RSVD Reserved Input Note All other pins are not connected Connecting Thermocouples Refer to the terminal block installation guide such as the SCXI 1303 for information about connecting thermocouples NI recommends using an isothermal terminal block such as the SCXI 1303 for accurate thermocouple measurements Connecting RTDs Refer to the SCXI 1581 User Manual for information about connecting RTDs and for additional RTD theory Connecting a Current Loop Receiver Refer to Appendix E Current Loop Receivers for information about connecting current loop receivers National Instruments Corporation 2 9 SCXI 1102 B C User Manual Configuring and Testing This chapter discusses configuring the SCXI 1102 B C in MAX for use with either N DAQmx or Traditional NI DAQ Legacy creating and testing a virtual channel global channel and or task SCXI 1102 B C Software Configurable Settings This section describes how to set the gain input signal range and how to configure your software for compatible sensor types It also describes how to perform configuration of these settings for the SCXI 1102 B C in NI DAQmx and Traditional NI DAQ Legacy For more information on the relationship between the settings and the measurements and how to configure settings in y
20. ground that should be applied to an input terminal during normal use normally well under the breakdown voltage for safety margin Includes both the signal and common mode voltages SCXI 1102 B C User Manual G 10 ni com Index Symbols 5 V signal front connector signal table 2 3 front signal pin assignment table 2 2 A adjusting timing and triggering 5 3 AI GND signal table 2 7 AI HOLD COMP signal table 2 7 AI HOLD signal table 2 7 AB1 through AIO signals table 2 3 AI31 through AI0 signals table 2 3 amplifier characteristics specifications A 2 analog circuitry analog input channels 4 2 CJ SENSOR 4 2 analog input channels 4 2 analog input signal connections 2 3 ground referencing of signals 2 4 floating signal connection referenced to chassis ground figure 2 6 ground referenced signal connection figure 2 5 analog input signals multiplexed 4 3 analog input specifications amplifier characteristics A 2 dynamic characteristics A 2 input characteristics A 1 transfer characteristics A 1 application software installation 1 4 O National Instruments Corporation 1 1 applications developing in NI DAQm x 5 1 acquiring analyzing and presenting 5 7 completing 5 7 LabVIEW 5 7 program flowchart figure 5 2 programmable properties 5 13 specifying channel strings 5 10 Traditional NI DAQ Legacy 5 13 bent and trimmed resistor figure E 2 C C language and low level
21. latest version of NI DAQ for your operating system I have gone over the Verifying and Self Testing the Installation section of Chapter 1 About the SCXI 1102 B C yet I still cannot correctly test and verify that my SCXI 1102 B C is working What should I do now Unfortunately there is always the chance that one or more components in the system are not operating correctly You may have to call or email a technical support representative The technical support representative often suggests additional troubleshooting measures If requesting technical support by phone have the system nearby so you can try these measures immediately NI contact information is listed in the Technical Support Information document In NI DAQm x can I use channels of different measurement types in the same task Yes Does MAX allow me to configure two SCXI 1102 B C modules that are in the same chassis in the multiplexed mode with two different E M Series DAQ devices No National Instruments Corporation D 1 SCXI 1102 B C User Manual Appendix D Common Questions Can I use the unused analog input channels of the E M Series DAQ device if I am directly cabled to the SCXI 1102 B C for example with the SCXI 1180 feedthrough Yes E M Series DAQ device channels 1 through 7 are available when directly connected to the SCXI 1102 B C Which digital lines are unavailable on the E M Series DAQ device if I am cabled to an SCXI 1102 B C module Table
22. repeat channels or use nonsequential channels using this function 3 Use SCXI_MuxCtr_Setup to program the E M Series DAQ device with the correct number of channels multiplexed per scan This number must match the total number of channels programmed in step 2 You are now ready to acquire the channel data with the E M Series DAQ device If you are using a multifunction E M Series DAQ device you can use SCAN_Op to perform the scanning operation After scanning convert the binary data to voltage data using SCXI_Scale Refer to the NI DAQ User Manual for additional information on scanning with E M Series DAQ devices Traditional NI DAQ Legacy CVI Examples Many example programs ship with NI DAQ For more example information on how to create tasks and channels refer to the example programs By default the example programs are installed in C Program Files NationalInstruments CVI 7 0 Samples More examples are installed by default in c Program Files National Instruments NI DAQ Examples Traditional NI DAQ Legacy Measurement Studio Examples Many example programs ship with NI DAQ For more example information on how to create tasks and channels refer to the example programs By default the example programs are installed in C Program Files NationalInstruments Measurement Studio 7 0 More examples are installed by default in C Program Files National Instruments NI DAQ Examples National Instruments Corporation 5 17 SCXI 1
23. testing the installation the SCXI system should operate properly with your ADE software If the test did not complete successfully refer to Chapter 3 Configuring and Testing for troubleshooting steps Troubleshooting the Self Test Verification If the self test verification did not verify the chassis configuration complete the steps in this section to troubleshoot the SCXI configuration Troubleshooting in NI DAQmx e Ifyou get a Verify SCXI Chassis message box showing the SCXI chassis model number Chassis ID x and one or more messages stating Slot Number x Configuration has module SCXI XXXX or 1102 B C hardware in chassis is Empty take the following troubleshooting actions Make sure the SCXI chassis is powered on Make sure all SCXI modules are properly installed in the chassis Refer to the SCXT Quick Start Guide for proper installation instructions Make sure the cable between the SCXI chassis and E M Series DAQ device is properly connected Inspect the cable connectors for bent pins SCXI 1102 B C User Manual 1 6 ni com Chapter 1 About the SCXI 1102 B C Make sure you are using the correct NI cable assembly Test the E M Series DAQ device to verify it is working properly Refer to the E M Series DAQ device help file for more information e Ifyou get a Verify SCXI Chassis message box showing the SCXI chassis model number Chassis ID x and the message Slot Number x Configuration
24. the channels click the Stop button You have now verified the SCXI 1102 B C configuration and signal connection 3 Note For more information on how to further configure the SCXI 1102 B C or how to use LabVIEW to configure the module and take measurements refer to Chapter 4 Theory of Operation Verifying the Signal in Traditional NI DAQ Legacy This section discusses how to verify the signal in Traditional NI DAQ Legacy using channel strings and virtual channels Verifying the Signal Using Virtual Channel If you have already created a virtual channel complete the following steps to verify the signal 1 2 3 SCXI 1102 B C User Manual Right click the virtual channel you want to verify and select Test In Channel Names select the channel you want to verify When you have completed verifying the channel click Close 3 6 ni com Chapter 3 Configuring and Testing Verifying the Signal Using Channel Strings Refer to AppendixChapter B Using SCXI Channel Strings with Traditional NI DAO Legacy 7 0 or Later for information about formatting channel strings Complete the following steps to use channel strings in verifying the signal 1 Click next to Devices and Interfaces 2 Click next to Traditional NI DAQ Devices 3 Right click the appropriate E Series DAQ device 4 Click Test Panels 5 Enter the channel string 6 Enter the input limits 7 Select the Data Mode 8 Select the Y Scale Mode
25. to modify the task To create a configurable channel or task in LabWindows CVI complete the following steps 1 Launch LabWindows CVI 2 Open a new or existing project 3 From the menu bar select Tools Create Edit DAQmx Tasks National Instruments Corporation 5 11 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C 4 Choose Create New Task In MAX or Create New Task In Project to load the DAQ Assistant 5 The DAQ Assistant creates the code for the task based on the parameters you define in MAX and the device defaults To change a property of the channel programmatically use the DAQmxSetChanAttribute function ny Note Refer to the NJ LabWindows CVI Help for more information on creating NI DAQmx tasks in LabWindows CVI and NI DAQmx property information SCXI 1102 B C User Manual Measurement Studio Visual Basic 6 NET and C When creating an voltage measurement task in Visual Basic 6 NET and C follow the general programming flow in Figure 5 1 You can then use the appropriate function calls to modify the task This example creates a new task and configures an NI DAQmx voltage measurement channel on the SCXI 1102 B C You can use the same functions for Visual Basic 6 NET and CA The following text is a function prototype example void AIChannelCollection CreateVoltageChannel System String physicalChannelName System String nameToAssignChannel System Double minVal System Double maxVal To
26. 1 0 0 0 eee 5 5 Table 5 3 NI DAQmx RTD Measurement Properties 000 0 eee eee eee eeeereeeeee 5 5 Table 5 4 NI DAQmx Thermistor Measurement Properties eee 5 6 Table 5 5 NI DAQmx Current Measurement Properties s es 5 6 Table 5 6 Programming a Task in LabVIEW oo eee eseeeereeeeeeeeeeeeeeeeeees 5 8 Table 5 7 NI DAQ Functions Used to Configure SCXI 1102 B C seses 5 17 Table D 1 Digital Signals on the SCXI 1102 B C coonconccnccnicnonnconcconcnnncanonnncncnnnon D 2 SCXI 1102 B C User Manual X ni com About the SCXI 1102 B C This chapter introduces the SCXI 1102 B C module and explains how to install and remove the software and hardware The SCXI 1102 B C modules are for signal conditioning of thermocouples low bandwidth volt and millivolt sources 4 to 20 mA current sources and 0 to 20 mA process current sources When used with the SCXI 1581 precision current source module you can use the SCXI 1102 B C to measure RTDs and thermistors The SCXI 1102 B C has 32 differential analog input channels and one cold junction sensor channel Each channel also has an amplifier with a selectable gain of 1 or 100 You can multiplex the SCXI 1102 B C inputs to a single output which drives a single DAQ device channel On each channel the modules have the following e SCXI 1102 a two pole lowpass filter with a 2 Hz cutoff frequency to reject 60 Hz noise e SCXI 1102B a three pole lowpass filter with a 200 Hz cutoff frequency
27. 102 B C Appendix D Common Questions Appendix E Current Loop Receivers Glossary Index National Instruments Corporation ix SCXI 1102 B C User Manual Contents Figures Figure 2 1 Ground Referenced Signal Connection ooooccnccnonnnoncnonconconcnancnanonncnnncnos 2 5 Figure 2 2 Floating Signal Connection Referenced to Chassis Ground 2 6 Figure 4 1 SCXI 1102 B C Module Block DiagraM ocoonccnnnnonnnonconnnoncnaninncnnnonncnno 4 1 Figure 5 1 Typical Program Flowchart for Voltage Measurement Channels 5 2 Figure 5 2 Typical SCXI 1102 B C Program Flow with Traditional NI DAQ Legacy ooocooccconccnoonconccnonaconcnonnaconcnonnncnnccnnnos 5 14 Figure A 1 SCXI 1102 B C Dimensions c ccoccnocnnononncononancnnnnnncnnnnnnonnonnncnncnnncnncrnncnnos A 4 Figure C 1 Removing the SCXI 1102 B C ooconcnicononconnnonconcnnncnnonnnonncnnnonncrnncnnonnnos C 2 Figure E 1 Bent and Trimmed Resistor ooooonnccninccnocononcconnnnonnconcnonncconcconanonnccnnncnnnos E 2 Tables Table 2 1 SCXI 1102 B C Front Signal Pin Assignments n se 2 2 Table 2 2 Front Connector Signals sirsiran e ron cnncnnnons 2 3 Table 2 3 Rear Signal Pin Assignment coccnocnnonconnnnnconnonnconnnnnonnconncnnncnnonnccnncnnn ns 2 7 Table 2 4 SCXI 1102 B C Communication Signals eee eeeeeeseeeeeneeees 2 8 Table 5 1 NI DAQmx Voltage Measurement Properties 00 0 0 eee eeeeeeeeeees 5 4 Table 5 2 NI DAQmx Thermocouple Measurement Properties
28. 102 B C User Manual Chapter 5 Using the SCXI 1102 B C Calibration The SCXI 1102 B C is shipped with a calibration certificate and is calibrated at the factory to the specifications described in Appendix A Specifications Calibration constants are stored inside the calibration EEPROM and provide software correction values your application development software uses to correct the measurements for both offset and gain errors in the module You can download all available external calibration documents by going to ni com calibration and clicking Manual Calibration Procedures NI recommends you perform an external calibration once a year SCXI 1102 B C User Manual 5 18 ni com Specifications This appendix lists the specifications for the SCXI 1102 B C modules These specifications are typical at 25 C unless otherwise noted Analog Input Input Characteristics Number of channels oooonnnnnnnccuconoccnnnnn 32 differential Input signal ranges ss 100 mV gain 100 or 10 V gain 1 Input damage level Powered ON cococcccccccnnnnnnnncanananononnnnnns 42 VDC Powered Odf ccccccccnnninnnanananannnnnnnos 27 VDC Inputs protected eee CH lt 0 31 gt CJ SENSOR Transfer Characteristics Nonlinearity 0 0 0 ee eeeeeeeeeeneeeees 0 005 FSR Offset error Gain 1 After calibration 300 uV max Before calibration 600 uV Gain 100 After calibration 15 uV max Before calibration
29. 1Z ccoo dis 40 dB 1102 Step response either gain Characteristics 1102 1102B 1102C To 0 1 ls 10 ms 200 us To 0 01 10s 100 ms l us Stability Recommended warm up time 20 min Offset temperature coefficient Gain a lui 20 uV C Gai J00 1 V C Gain temperature coefficient 10 ppm C Power Requirements S V SUPPLY A TE 15 mA max 15 V supply regulated from 24 V supply eee eect eters 150 mA max National Instruments Corporation A 3 SCXI 1102 B C User Manual Appendix A Specifications Physical 17 2cm 6 8 in o A Lo DA gt issa y 7 4 in i Figure A 1 SCXI 1102 B C Dimensions Weights cita 611 gm 24 6 oz Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Signal common mode cee Each input should remain within 10 V of CH GND Environmental Operating temperature 0 0 0 to 50 C Storage temperature eee 20 to 70 C Humidity AAA enisvanes ce 10 to 90 RH noncondensing Maximum altitude 2 000 m Pollution Degree indoor use only 2 SCXI 1102 B C User Manual A 4 ni com Appendix A Specifications 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 IEC 61010 1 EN 61010 1
30. CXI 1102 B C User Manual Configuring Module Property Pages in Traditional NI DAQ Legacy 1 Right click the SCXI 1102 B C module you want to configure and select Properties Click General If the module you are configuring is connected to an E Series DAQ device select that device by using Connected to If you want the E Series DAQ device to control the chassis confirm there is a check in the This device will control the chassis checkbox If the module you are configuring is not connected to an E Series DAQ device select None 3 4 ni com Chapter 3 Configuring and Testing Click the Channel tab Select the appropriate gain for each channel If you want to configure all the channels at the same time select the Channel drop down list scroll to the bottom and select All Channels Refer to the SCXI 1102 B C Software Configurable Settings section for a detailed description of each setting Click Apply Click Accessory Select the accessory you connected to the module When configuration is complete click OK The Traditional NI DAQ Legacy chassis and SCXI 1102 B C should now be configured properly If you need to change the module configuration right click the module and repeat steps through 4 Test the system following the steps in the Troubleshooting the Self Test Verification section of Chapter 1 About the SCXI 1102 B C Creating a Virtual Channel To create a virtual channel complete the following steps 1 E a
31. Channel When you set the minimum and maximum range of NI DAQmx Task or NI DAQmx Global Channel the driver selects the best gain for the measurement National Instruments Corporation 3 3 SCXI 1102 B C User Manual Chapter 3 Configuring and Testing You also can set it through your application Refer to Chapter 3 Configuring and Testing for more information 10 If you are creating a task and want to set timing or triggering controls enter the values in the Task Timing and Task Triggering tabs Traditional NI DAQ Legacy Using Traditional NEDAQ Legacy you can configure software settings such as gain input signal range in the following three ways module property pages in MAX virtual channels properties in MAX functions in your ADE Sy Note All software configurable settings are not configurable in all three ways This section only discusses settings in MAX Refer to Chapter 4 Theory of Operation for information on using functions in your application Most of these settings are available in module properties and or using virtual channels Gain input signal range configure gain using module properties When you set the minimum and maximum range of the virtual channel the driver selects the best gain The default gain setting for Traditional NI DAQ Legacy is 100 ny Note Refer to Chapter 4 Theory of Operation for information on configuring the settings for your application using Traditional NI DAQ Legacy S
32. Conditioning eXtensions for Instrumentation the NI product line for conditioning low level signals within an external chassis near sensors so only high level signals are sent to DAQ devices in the noisy PC environment Located in the rear of an SCXI chassis the SCXIbus is the backplane that connects modules in the same chassis to each other A device that converts a physical phenomenon into an electrical signal Serial clock signal used to synchronize digital data transfers over the SER DAT IN and SER DAT OUT lines Serial data input signal Serial data output signal The manipulation of signals to prepare them for digitizing Refers to the power supply and control circuitry in the SCXI chassis Slot 0 select signal Underwriters laboratory Volts Positive supply voltage from the PCMCIA bus usually 5V Volts direct current Virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program Channel names that can be defined outside the application and used without having to perform scaling operations SCXI 1102 B C User Manual Glossary Vu Volts input high Vit Volts input low Vin Volts in Vou Volts output high VoL Volts output low W Watts working voltage The highest voltage with respect to
33. D 1 shows the digital lines that are used by the SCXI 1102 B C for communication and scanning These lines are unavailable for general purpose digital I O if the SCXI 1102 B C is connected to the E M Series DAQ device Table D 1 Digital Signals on the SCXI 1102 B C Traditional E M Series NI DAQmx NI DAQ DAQ Device SCXI Signal Legacy SCXI 50 Pin 68 Pin Signal Name Name Signal Name Connector Connector Direction DIOO P0 0 SERDATIN 25 52 Output DIO4 P0 4 SERDATOUT 26 19 Input DIO1 PO 1 DAQD A 27 17 Output DIO2 P0 2 SLOTOSEL 29 49 Output SCANCLK AI Hold Comp SCANCLK 36 46 Output AI Hold PFI7 PFI 7 HOLDTRIG 46 38 Input STARTSCAN AISAMP CLK AI SAMP EXTSROBE EXTSROBE SERCLK 37 45 Input With respect to the E M Series DAQ device SCXI 1102 B C User Manual D 2 ni com Appendix D Common Questions In LabVIEW can I use different input limits for the same SCXI 1102 B C channel if I repeat the channel in the SCXI channel string array No You cannot dynamically change the SCXI 1102 B C gain settings during scanning Therefore group channels with similar input ranges together in the channel string array Make sure that repeated channels in different indices of the channel string array have the same input limits in the corresponding input limits array In LabVIEW can I use a VI to change my SCXI 1102 B C configuration settings Yes In Traditional NI DAQ Legacy you can
34. F overvoltage protection O National Instruments Corporation G 7 Glossary To route one of many input signals to a single output An SCXI operating mode in which analog input channels are multiplexed into one module output so that the cabled E M Series DAQ device has accessed the module s multiplexed output as well as the outputs of all other multiplexed modules in the chassis Normally closed or not connected The driver software needed in order to use E M Series DAQ devices and SCXI components An undesirable electrical signal noise comes from external sources such as AC power lines motors generators electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors Noise corrupts signals you are trying to measure For an amplifier a measure of the maximum output deviation from an ideal linear response in units of percent relative to full scale The ideal linear response is taken to be a straight line on a plot of measured output voltage to measured input voltage with the ends of the line connecting the extremes of the plot at the full scale limits Output signal Output reference signal Maximum voltage that does not cause hardware damage SCXI 1102 B C User Manual Glossary P passband pole ppm PXI RMA rms RSVD S s S sample sample rate scan SCANCLK SCXI 1102 B C User Manual The range of input frequencies that are pass
35. GND 1 2 AIGND CHO 3 4 CH0 NC 5 6 NC 112 NC 7 8 NC a2 NC 9 10 NC 516 7 8 NC 11 12 NC 9 10 11110 NC 13 14 NC 13 14 NC 15 16 NC 15 16 17118 NC 17 18 NC 19 20 OUT REF 19 20 NC 21 22 23 24 NC 21 22 NC 25 26 NC 23 24 D GND 27 28 29 30 SER DAT IN 25 26 SER DAT OUT 31 32 DAQ D A 27 28 NC 33 34 35 136 SLOT 0 SEL 29 30 NC 37 38 D GND 31 32 NC 39 40 41 42 NC 33 34 NC nese NC 35 36 AI HOLD COMP AI HOLD 45 46 47 48 SER CLK 37 38 NC 49 50 NC 39 40 NC NC 41 42 NC RSVD 43 44 NC NC No NC 45 46 RSVD Connection NC 47 48 NC NC 49 50 NC National Instruments Corporation 2 7 SCXI 1102 B C User Manual Chapter 2 Connecting the Signals Rear Signal Connector Descriptions The rear signal connector on the cabled module is the interface between the DAQ device and all modules in the SCXI chassis CH 0 is used to differentially multiplex all 32 channels the CJ sensor and analog signals from the modules to the connected DAQ device The communication signals between the DAQ device and the SCXI system are listed in Table 2 4 If the DAQ device is connected to the SCXI 1102 B C these digital lines are unavailable for general purpose digital I O Table 2 4 SCXI 1102 B C Communication Signals Pin SCXI Signal Name NI DAQmx Device Signal Name Traditional NI DAQ Legacy Device Signal Name Direction Description 24 33 DIG GND D GND DGND Digit
36. I 1102 B C module connectors Refer to the installation guide of the terminal block for detailed information regarding connecting the signals If you are using a custom cable or connector block refer to the Front Connector section Front Connector Table 2 1 shows the pin assignments for the SCXI 1102 B C module front connector O National Instruments Corporation 2 1 SCXI 1102 B C User Manual Chapter 2 Connecting the Signals Table 2 1 SCXI 1102 B C Front Signal Pin Assignments Front Connector Diagram Pin Number Column A Column B Column C 32 CH GND AIO AIO Column 31 NC AIl AIl A B C 30 NC AI2 AI2 32 O O O 29 NC AI3 AI3 31 O D O 3010 o o 28 NC AI4 AI4 22 0 o o 27 NC AI5 AIS 2810 O 90 26 NC AL6 AL6 27 O O O 25 NC AI7 AI7 26 0 o o zlo o o 24 CH GND AI8 AI8 24 0 o o 23 NC AI9 ALO 23 9 o 0 22 NC AT 10 AT 10 22 O O O 21 NC AI ll AT11 21 0 o o l o o o 20 NC AI 12 AI 12 to o oO 19 NC AI 13 AI 13 181 2 8 18 NC AI 14 AI 144 17 O O O l o o 0 17 NC AI 15 AI 15 Alo o o 16 CH GND AI 16 AI 16 14 0 o Oo 15 NC AL17 AL17 19 10 e 14 NC AI 18 AI 18 12 O O O ls ae os 13 NC AI 19 AI 19 10 0 o o 12 NC AI 20 AI 20 9 0 O 0 11 NC AI21 AI21 8 O O O 10 NC AI22 AI 22 7 O O O 6 lo o o 9 NC AT23 AI23 5 0 o o 8 NC AT24 AT24
37. I CurrentShunt Loc Specifies the shunt resistance location Analog Input General Properties Signal Conditioning Current Shunt Resistor Value AlI CurrentShunt Resistance Specifies the resistance in ohms of the external shunt resistance 3 Note This is not a complete list of NI DAQmx properties and does not include every property you may need to configure your application It is a representative sample of important properties to configure for voltage measurements For a complete list of NI DAQmx properties and more information about NI DAQmx properties refer to your ADE help file SCXI 1102 B C User Manual 5 6 ni com Chapter 5 Using the SCXI 1102 B C Acquiring Analyzing and Presenting After configuring the task and channels you can start the acquisition read measurements analyze the data returned and display it according to the needs of your application Typical methods of analysis include digital filtering averaging data performing harmonic analysis applying a custom scale or adjusting measurements mathematically NI provides powerful analysis toolsets for each NI ADE to help you perform advanced analysis on the data without requiring you to have a programming background After you acquire the data and perform any required analysis it is useful to display the data in a graphical form or log it to a file NI ADEs provide easy to use tools for graphical display such as charts gra
38. LELY 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 Conventions lt gt E A A A bold italic monospace monospace bold 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 AO 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 alert
39. Manual 5 2 ni com Chapter 5 Using the SCXI 1102 B C General Discussion of Typical Flowchart The following sections briefly discuss some considerations for a few of the steps in Figure 5 1 These sections are meant to give an overview of some of the options and features available when programming with NI DAQmx Creating a Task Using DAQ Assistant or Programmatically When creating an application you must first decide whether to create the appropriate task using the DAQ Assistant or programmatically in the ADE Developing your application using DAQ Assistant gives you the ability to configure most settings such as measurement type selection of channels excitation voltage signal input limits task timing and task triggering You can access the DAQ Assistant through MAX or your NI ADE Choosing to use the DAQ Assistant can simplify the development of your application NI recommends creating tasks using the DAQ Assistant for ease of use when using a sensor that requires complex scaling or when many properties differ between channels in the same task If you are using an ADE other than an NI ADE or if you want to explicitly create and configure a task for a certain type of acquisition you can programmatically create the task from your ADE using functions or VIs If you create a task using the DAQ Assistant you can still further configure the individual properties of the task programmatically with functions or property nodes in your ADE
40. Qmx Read vi Analyze Data Some examples of data analysis include filtering scaling harmonic analysis or level checking Some data analysis tools are located on the Functions Signal Analysis subpalette and on the Functions All Functions Analyze subpalette SCXI 1102 B C User Manual 5 8 ni com Chapter 5 Using the SCXI 1102 B C Table 5 6 Programming a Task in LabVIEW Continued Flowchart Step VI or Program Step Display Data You can use graphical tools such as charts gauges and graphs to display the data Some display tools are located on the Controls All Controls Numeric Numeric Indicator subpalette and Controls All Controls Graph subpalette Continue Sampling For continuous sampling use a While Loop If you are using hardware timing you also need to set the DAQmx Timing vi sample mode to Continuous Samples To do this right click the terminal of the DAQmx Timing vi labeled sample mode and click Create Constant Click the box that appears and select Continuous Samples Stop Measurement DAQmx Stop Task vi This VI is optional clearing the task automatically stops the task Clear Task DAQmx Clear Task vi Using a NI DAQmx Channel Property Node in LabVIEW You can use property nodes in LabVIEW to manually configure the channels To create a LabVIEW property node complete the following steps 1 Launch LabVIEW 2 Create the property node in a new
41. Quick Start Guide for information on verifying the SCXI installation Installing SCXI Using NI DAQmx in Software Refer to the SCXI Quick Start Guide for information on installing modules using NI DAQmx in software Manually Adding Modules in NI DAQmx If you did not auto detect the SCXI modules you must manually add each of the modules Refer to the SCX7 Quick Start Guide to manually add modules 3 Note NI recommends auto detecting modules for the first time configuration of the chassis Installing SCXI Using Traditional NI DAQ Legacy in Software Refer to the SCXI Quick Start Guide for information on installing modules using Traditional NI DAQ Legacy in software National Instruments Corporation 1 5 SCXI 1102 B C User Manual Chapter 1 About the SCXI 1102 B C Manually Adding Modules in Traditional NI DAQ Legacy If you did not auto detect the SCXI modules you must manually add each of the modules Refer to the SCXT Quick Start Guide to manually add modules Sy Note NI recommends auto detecting modules for the first time configuration of the chassis Verifying and Self Testing the Installation The verification procedure for the SCXI chassis is the same for both NI DAQmx and Traditional NI DAQ Legacy To test the successful installation for the SCXI chassis refer to the SCXT Quick Start Guide Verify that the chassis is powered on and correctly connected to an E M Series DAQ device After verifying and self
42. SCXI SCXI 1102 B C User Manual April 2006 lt 7 NATIONAL 371975D 01 INSTRUMENTS 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 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada 800 433 3488 China 86 21 6555 7838 Czech Republic 420 224 235 774 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 India 91 80 41190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Lebanon 961 0 1 33 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 3390150 Portugal 351 210 311 210 Russia 7 095 783 68 51 Singapore 1800 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 02 2377 2222 Thailand 662 278 6777 United Kingdom 44 0 1635 523545 For further support information refer to the Technical Support Information document To comment on National Instruments documentation refer to the National Instruments Web site at ni com info and enter the info code feedback O 1996 2006 National Instruments Corporation All rights reserved Important Inform
43. SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C Virtual Channel y Create Virtual Channel in MAX Use Virtual Channel or SCXI Channel String SCXI Channel String Configure Acquisition Settings Configure Mode Properties y Start Acquisition Take Measurements Continue Sampling No y Scale Analyze and Display y Clear Acquisition Vv Error Handling Figure 5 2 Typical SCXI 1102 B C Program Flow with Traditional NI DAQ Legacy Other Application Documentation and Material This section provides information about multiplexed scanning and the Traditional NI DAQ Legacy examples for Measurement Studio and LabWindows CVI Refer to the ADE manual and the DAQ analog input examples that come with your application software for more detailed information on programming the SCXI modules for scanning in multiplexed mode SCXI 1102 B C User Manual 5 14 ni com Chapter 5 Using the SCXI 1102 B C Using Software for Multiplexed Scanning Performing scanning operations in software depends on the ADE you are using While using LabVIEW or Visual Basic 6 all scanning Operations are prepared in software by using an SCXI channel string as the input to the channel parameter in the analog input VI or function These ADEs also support virtual channels using Data Neighborhood DAQ Channel Wizard in MAX In LabWi
44. actually create and configure the channel you would enter something resembling the following example code Task myTask new NationalInstruments DAQmx Task myTaskName MyTask DAQmxCreateAIVoltageChan SC1Mod1 ai0 System String physicalChannelName Voltage0 System String nameToAssignChannel 10 0 System Double minVal 10 0 System Double maxVal setting attributes after the channel is created AIChannel myChannel myTask AIChannels Voltage0 myChannel Gain 100 0 Modify the example code above or the code from one of the shipping examples as needed to suit your application Refer to the Other Application Documentation and Material section for the location of program examples 5 12 ni com Chapter 5 Using the SCXI 1102 B C B Note You can create and configure the voltage measurement task in MAX and load it into your application with the function call NationalInstruments DAQmx DaqSystem Local LoadTask Refer to the NI Measurement Studio Help for more information on creating NI DAQmx tasks in LabWindows CVI and NI DAQmx property information Programmable NI DAQmx Properties All of the different ADEs that configure the SCXI 1102 B C access an underlying set of NI DAQmx properties Tables 5 1 5 2 and 5 3 provide a list of some of the properties that configure the SCXI 1102 B C You can use this list to determine what kind of properties you need to set to configure the device for your applicat
45. al NI DAQ Legacy 5 13 manually adding modules 1 5 RTD measurement properties table 5 5 thermistor measurement properties table 5 6 thermocouple measurement properties table 5 5 voltage measurement properties table 5 4 0 OUT REF signal table 2 7 P physical specifications A 4 pin assignments front connector table 2 2 rear signal table 2 7 power requirements specifications A 3 power up state of SCXI 1102 B C D 3 PXI SCXI combination chassis 1 5 Q questions common D 1 R rear signal connector 2 6 4 2 connecting current loop receiver 2 9 RTDs 2 9 thermocouples 2 9 descriptions 2 8 pin assignments figure 2 7 table 2 7 National Instruments Corporation 1 5 Index pin assignments figure 2 7 removing SCXI 1102 B C from Measurement amp Automation Explorer C 1 from SCXI chassis C 1 RSVD signal table 2 7 RTD connecting 2 9 measurement properties table 5 5 S SCXI channel string See also multiplexed scanning defined 5 15 LabVIEW channel scanning 5 15 SCXI chassis connecting SCXI 1102 B C to E M Series DAQ device 1 5 installing the SCXI 1102 B C module 1 4 SCXI 1102 B C See also theory of operation calibration 5 18 common questions D 1 common software settings 3 1 communication signals table 2 8 configuration settings 3 1 configuring with NI DAQ functions table 5 17 connecting signals 2 1 custom cables 2 1 digital signals table
46. al conversion A type of signal conditioning that improves accuracy in the resulting digitized signal by increasing signal amplitude relative to noise DAQ and SCXI analog output ground signal Analog output reference The range of frequencies present in a signal or the range of frequencies to which a measuring device can respond The small input current flowing into or out of the input terminals of an amplifier One binary digit either 0 or 1 The group of conductors that interconnect individual circuitry in a computer Typically a bus is the expansion interface to which I O or other devices are connected Examples of a PC bus is a PCI bus G 2 ni com CE CH GND CH channel chassis CJ SENSOR CLK clock CMRR common mode voltage cutoff frequency D D A DAQ device DAQD A dB National Instruments Corporation G 3 Glossary Celsius European emissions control standard Chassis ground signal Analog input channel signal Pin or wire lead to which you apply or from which you read the analog or digital signal Analog signals can be single ended or differential For digital signals you group channels to form ports Ports usually consist of either four or eight digital channels The enclosure that houses powers and controls SCXI modules Cold junction temperature sensor Clock input signal Hardware component that controls timing for reading from or writing to groups Common mode re
47. al ground these pins supply the reference for E M Series DAQ device digital signals and are connected to the module digital ground 25 SER DAT IN P0 0 DIOO Input Serial data in this signal taps into the SCXIbus MOSI line to send serial input data to a module or Slot 0 26 SER DAT OUT P0 4 DIO4 Output Serial data out this signal taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQ D A PO 1 DIO1 Input Board data address line this signal taps into the SCXIbus D A line to indicate to the module whether the incoming serial stream is data or address information SCXI 1102 B C User Manual 2 8 ni com Chapter 2 Table 2 4 SCXI 1102 B C Communication Signals Continued Connecting the Signals Pin SCXI Signal Name NI DAQmx Device Signal Name Traditional NI DAQ Legacy Device Signal Name Direction Description SLOTOSEL PO 2 DIO2 Input Slot 0 select this signal taps into the SCXTbus INTR line to indicate whether the information on MOST is being sent to a module or Slot 0 36 SCANCLK AI HOLD COMP AI HOLD SCANCLK Input Scan clock a rising edge indicates to the scanned SCXI module that the E M Series DAQ device has taken a sample and causes the module to advance channels 37 SER CLK EXTSTROBE EXTSTROBE Input Serial
48. ation Warranty The SCXI 1102 SCXI 1102B and SCXI 1102C modules 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 Na
49. ational Instruments Corporation A 5 SCXI 1102 B C User Manual Using SCXI Channel Strings with Traditional NI DAQ Legacy 7 0 or Later 3 Note This appendix is not applicable if you use the virtual channels to configure and measure the SCXI channels Virtual channels are configured using MAX If you use virtual channels you address the SCXI channels by specifying the channel name s in the channel string input When using LabVIEW and Visual Basic the SCXI channel string determines which SCXI channels are scanned and the scanning sequence The SCXI channel string allows you to take measurements from several channels on one module with only one channel string entry An array of these channel string entries configures multiple modules for scanning When the application program runs the channel string is used for programming the channel information into the SCXI system The format of the channel string is as follows obx scy mdz channels where obx is the onboard E Series DAQ device channel with x representing a particular channel where the multiplexed channels are sent This value is 0 for E Series DAQ device channel 0 in a single chassis system In a multichassis or remote chassis system the E Series DAQ device channel x corresponds to chassis number n 1 where E Series DAQ device channel xis used for scanning the nth chassis in the system scy is the SCXI chassis ID where y is the number you chose when configuring the
50. cold junction sensor 2 6 SCXI 1102 B C User Manual 1 2 connector front 2 1 front signal pin assignments table 2 2 rear signal 2 6 rear signal pin assignments table 2 7 conventions used in the manual iv creating a task DAQ Assistant 5 3 programmatically 5 3 creating a virtual channel 3 5 current measurement properties table 5 6 current loop receivers E 1 connecting 2 9 custom cables 2 1 D D GND signal front signal pin assignment table 2 7 rear signal pin assignment table 2 7 DAQ Assistant creating a task 5 3 DAQ D A signal table 2 7 DAQ devices cabling restrictions with plug in E Series DAQ devices D 3 low level DAQ functions and multiplexed scanning 5 16 unavailable digital lines D 2 digital control circuitry 4 2 digital settings unavailable with DAQ device connected table D 2 digital signals on the SCXI 1102 B C table D 2 documentation conventions used in the manual iv National Instruments 1 3 other application and material 5 14 SCXI 1102 B C 1 3 dynamic characteristics specifications A 2 ni com E E M Series DAQ devices 4 3 connecting to SCXI 1102 B C for multiplexed scanning in PXI SCXI combination chassis 1 5 in SCXI chassis 1 5 environmental specifications A 4 examples Traditional NI DAQ Legacy CVI 5 17 Measurement Studio 5 17 F filters specifications A 3 front connector pin assignments figure 2 2 pin assignments table 2 2 signal descri
51. e 5 Left click inside the property box and select ActiveChans This allows you to specify what channel s you want to configure If you want to configure several channels with different properties separate the lists of properties with another ActiveChans box and assign the appropriate channel to each list of properties 6 Right click ActiveChans and select Add Element Left click the new ActiveChans box Navigate through the menus and select the property you wish to define 7 You must change the property to read or write to either get the property or write a new value Right click the property go to Change To and select Write Read or Default Value 8 After you have added the property to the property node right click the terminal to change the attributes of the property add a control constant or indicator 9 To add another property to the property node right click an existing property and left click Add Element To change the new property left click it and select the property you wish to define Ss Note Refer to the LabVIEW Help for information about property nodes and specific NI DAQmx properties Text Based ADEs You can use text based ADEs such as LabWindows CVI Measurement Studio Visual Basic 6 NET and C to create code for using the SCXI 1102 B C LabWindows CVI LabWindows CVI works with the DAQ Assistant in MAX to generate code for an voltage measurement task You can then use the appropriate function call
52. e UL 61010 1 CAN CSA C22 2 No 61010 1 3 Note For UL and other safety certifications refer to the product label or visit ni com certification search by model number or product line and click the appropriate link in the Certification column Electromagnetic Compatibility This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement control and laboratory use e EN 61326 EMC requirements Minimum Immunity e EN 55011 Emissions Group 1 Class A CE C Tick ICES and FCC Part 15 Emissions Class A 3 Note For EMC compliance operate this device to product documentation CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows e 73 23 EEC Low Voltage Directive safety e 89 336 EEC Electromagnetic Compatibility 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 visit ni com certification search by model number or product line and click the appropriate link in the Certification column Waste Electrical and Electronic Equipment WEEE EU Customers At the end of their life cycle all products must be sent to a WEEE recycling center For more information about WEEE recycling centers and National Instruments WEEE initiatives visit ni com environment weee htm O N
53. e messages continue to appear until you install version 7 0 or later of an NI ADE This section describes where users can access each software configurable setting for modification in MAX The location of the settings varies depending on the version of NI DAQ you use Refer to either the NI DAQmx section or the Traditional NI DAQ Legacy section You also can refer to the DAQ Getting Started Guide and the SCXI Quick Start Guide for more information on installing and configuring the hardware You also can use the DAQ Assistant to graphically configure common measurement tasks channels or scales NI DAQmx Using NI DAQmx you can configure software settings such as sensor type and gain input signal range in the following ways Task or global channel in MAX Functions in your application A Note All software configurable settings are not configurable both ways This section only discusses settings in MAX Refer to Chapter 4 Theory of Operation for information on using functions in your application and for information on configuring the settings for your application using Traditional NI DAQ Legacy You can use the SCXI 1102 B C module to make the following types of measurements SCXI 1102 B C User Manual Voltage input Thermocouple RTD Thermistors Current input 3 2 ni com Chapter 3 Configuring and Testing Creating a Global Channel or Task To create a new voltage temperature or current input NI DAQmx globa
54. e rate You also can select advanced features such as clock settings that specify an external clock source internal routing of the clock source or select the active edge of the clock signal Configuring Channel Properties All ADEs used to configure the SCXI 1102 B C access an underlying set of NI DAQmx properties Table 5 1 shows some of these properties You can use Table 5 1 to determine what kind of properties you need to set to configure the module for your application For a complete list of NI DAQmx properties refer to your ADE help file nye Note You cannot adjust some properties while a task is running For these properties you must stop the task make the adjustment and re start the application Tables 5 1 5 2 5 3 and 5 4 assume all properties are configured before the task is started Table 5 1 NI DAQmx Voltage Measurement Properties Property Short Name Description Analog Input Maximum Value AI Max Specifies the maximum value you expect to measure The SCXI 1102 B C gain and E M Series DAQ device range are computed automatically from this value Analog Input Minimum Value AI Min Specifies the minimum value you expect to measure The SCXI 1102 B C gain and E M Series DAQ device range are computed automatically from this value Analog Input General Properties AI RNG High Specifies the upper limit of the Advanced Range High E M Series DAQ device input range in voltage SCXI
55. eRe es See A 2 1 Front Connector Signal Descriptions o ooooccnonnocnnonnoonnoncnnncnncnnnonncnnncnnc nac canonnno 2 3 Analog Input Signal Connections ooooocnnccnonnnononnnonononcnanonaconcrnnonnccnnos 2 3 Cold Junction Sensor Connection eee seeceseeseesseeeeeeeeseeseeeseseeeeaeeeaes 2 6 Rear Signal Conector iniciada 2 6 Rear Signal Connector Descriptions ooooccnccnonnnoncononancnnnonoconono nono nn nonncnnncnnornno 2 8 Connecting Thermocouples oooconncnncnonnnnnnonconnnoncononononnnonccnnornnonn cinco 2 9 Connecting RTDS rrr ai enera e a dais 2 9 Connecting a Current Loop Receiver oooonnconocnnonconnnnonnnonanananancnnconno 2 9 Chapter 3 Configuring and Testing SCXI 1102 B C Software Configurable SettidgS cononcnnnnncninncncnccnconnrancnanonncancnanonnno 3 1 Common Software Configurable Settings ooooconnoninnnnnnncnnonconnnanonnnrnncnnornonnno 3 1 Gain Input Range ssiri inanin eair 3 1 CIC Source Valle noc aa 3 1 O National Instruments Corporation vii SCXI 1102 B C User Manual Contents Configurable Settings in MAX eee ceeceseeseesseeseceeeaeeeeeaeseeeeaessaeeaeseaeeseeseeeaees 3 2 NIEDAQMX seins 3 2 Creating a Global Channel or Task ooooonnoncninonicnnonnonconnnoncnncnnnonnnnno 3 3 Traditional NI DAQ Legacy 0 eesesscecsseceseceseeeeeeeeeeeaeceseeceeeseaeessaeeeaeesaes 3 4 Configuring Module Property Pages in Traditional NI DAQ Legacy ococococccnocinonnnonnconnnonnnconccconnconccnnncnnnos 3 4
56. ed to fit the input limits NI recommends using the obx specifier Repeating channels or having channels out of sequence in a scan list is not supported by the SCXI 1102 B C and results in an error For more information about using SCXI channel string refer to the LabVIEW Measurements Manual and SCXI 1102 B C shipping examples SCXI 1102 B C User Manual B 2 ni com Removing the SCXI 1102 B C This appendix explains how to remove the SCXI 1102 B C from MAX and an SCXI chassis 3 Note Figure C 1 shows an SCXI chassis but the same steps are applicable to a PXI SCXI combination chassis Removing the SCXI 1102 B C from MAX To remove a module from MAX complete the following steps after launching MAX 1 Expand Devices and Interfaces to display the list of installed devices and interfaces 2 Expand NI DAQmx Devices and or Traditional NI DAQ Devices to display the chassis Expand the appropriate chassis to display the installed modules 4 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 3 Note Deleting the SCXI chassis deletes all modules in the chassis All configuration information for these modules is also deleted The SCXI chassis and or SCXI module s should now be removed from the list of installed devices in MAX Removing the SCXI 1102 B C from a Chassis Cons
57. ed to the filter output without attenuation A term used to describe the quality of a lowpass filter In general the more poles a lowpass filter has the better it attenuates frequencies beyond the cutoff frequency Parts per million PCI eXtensions for Instrumentation an open specification that builds on the CompactPCI specification by adding instrumentation specific features Return Material Authorization Root mean square the square root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude Reserved bit pin or signal Seconds Samples An instantaneous measurement of a signal normally using an analog to digital converter in an E M Series DAQ device The number of samples a system takes over a given time period usually expressed in samples per second 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 Scan clock signal used to increment to the next channel after each E M Series DAQ device analog to digital conversion G 8 ni com SCXI SCXIbus sensor SER CLK SER DAT IN SER DAT OUT signal conditioning Slot 0 SLOT 0 SEL U UL Vcc VDC VI virtual channels National Instruments Corporation G 9 Glossary Signal
58. eeeseceeceeeeseeeeetseseeeeseeeaees 5 7 Developing an Application Using LabVIEW uu eee eee eseesceseeneeeeeseenees 5 7 Using a NI DAQmx Channel Property Node in LabVIEW 5 9 Specifying Channel Strings in NI DAQMX oo eee eee eee ese eeeeseeeseteeeseeneees 5 10 Text Based ADES tuenti stas icon eda berets anes 5 11 Programmable NI DAQmx Properties ooooonoccnoconnnnonconononcnnnnnncannnnnonn 5 13 Developing Your Application in Traditional NI DAQ Legacy 5 13 Other Application Documentation and Material ooncnncnncnnnnnonanoncnncnnncnncnnncononancnncnnnono 5 14 Using Software for Multiplexed ScaMning oconconncnonnnonnnononnnonncononnnonncrnncnnonnno 5 15 LabVIEW and the SCXI Channel StridB oooonncnnncninnnnnconnnancnnninncanon 5 15 LabVIEW and the Virtual Channel String ooooonccnncnocnnonnncnnnncnnnnnnnn 5 15 SCXI 1102 B C User Manual viii ni com Contents Performing a Multiplexed Ca oooocncnnncnncnonnnonconcnnnconcnnnonncnn nono nnnonnonnncnnc rancia 5 16 C and Low Level DAQ Functions coooccconocnnnnonnncnoncnnnoncnononcncnononcnno 5 16 Traditional NI DAQ Legacy CVI Examples oooncnnconocnonnnoncnnonnnoncnanconcrnnonnos 5 17 Traditional NI DAQ Legacy Measurement Studio Examples 0 5 17 Calibration oscar sheen bases an tata Andee ethene 5 18 Appendix A Specifications Appendix B Using SCXI Channel Strings with Traditional NI DAQ Legacy 7 0 or Later Appendix C Removing the SCXI 1
59. el strings with Traditional NI DAQ Legacy B 1 SCXI 1102 B C User Manual
60. exing rate of SCXI is 333 kHz If the E M Series DAQ device can sample more quickly than 333 kHz then the maximum multiplexing rate of SCXT is the limiting factor If the E M Series DAQ device cannot sample at 333 kS s the sample rate of the E M Series DAQ device is the limiting factor on the maximum acquisition rate of the system Since you must scan the SCXI 1102 B C sequentially the driver automatically scans channels not included in the scan list if a sequential order is not maintained When this happens the maximum sample rate is also factored into the channels that are scanned and discarded for the purpose of completing the scan list For measurement accuracy of 0 012 of full scale the minimum scan interval is 3 us which is the smallest interval in which you can switch between analog channels on the module and still measure accurate voltages The 3 us scan interval gives you a maximum sampling rate of 333 kHz For better accuracy you must increase the scan interval in accordance with the specifications which will reduce the maximum aggregate sample rate 4 4 ni com Using the SCXI 1102 B C This chapter makes suggestions for developing your application and provides basic information regarding calibration Developing Your Application in NI DAQmx Sy Note If you are not using an NI ADE using an NI ADE prior to version 7 0 or are using an unlicensed copy of an NI ADE additional dialog boxes from the NI License Manager a
61. f Chapter 3 Configuring and Testing and make sure the correct module is in the specified slot Delete the incorrect module as described in Appendix C Removing the SCXI 1102 B C and add the correct module as described in the Traditional NI DAQ Legacy section of Chapter 3 Configuring and Testing e Ifyou get the message Failed to find followed by a module code and the message Slot x is empty make sure the configured module is installed in the specified slot If not install the module by following the instructions in the SCXT Quick Start Guide If the module is installed in the correct slot power off the chassis remove the module as specified in Appendix C Removing the SCXI 1102 B C and verify that no connector pins are bent on the rear signal connector Reinstall the module as described in the SCXT Quick Start Guide ensuring the module is fully inserted and properly aligned in the slot e After checking the preceding items return to the Troubleshooting the Self Test Verification section and retest the SCXI chassis If these measures do not successfully configure the SCXI system contact NI Refer to the Technical Support Information document for contact information 1 8 ni com Connecting the Signals This chapter describes the input and output signal connections to the SCXI 1102 B C module with the module front connector and rear signal connector This chapter also includes connection instructions for the signals on the SCX
62. ferencing the Signals The input signals can be either ground referenced as shown in Figure 2 1 or floating as shown in Figure 2 2 Before you connect the thermocouple or any other signal determine whether it is floating or ground referenced If it is a floating signal you must ground reference the signal in one of two ways You can connect the negative channel input to chassis ground through a bias resistor as shown in Figure 2 2 or you can use the bias resistors that are included with some terminal blocks such as the SCXI 1303 The SCXI 1303 also has a resistor pack for pulling up the positive inputs for open thermocouple detection Consult the installation guide of your terminal block for details Do not ground signals that are already ground referenced doing so results in a ground loop which adversely affects the measurement accuracy Directly grounding floating signals to the chassis ground without using a bias resistor is not recommended as this can result in noisy readings 2 4 ni com Chapter 2 Connecting the Signals 10H 0 CH 0 o CH 1 sa O T Front Signal Connector e O JO I I e l SCXI 1102 B C Figure 2 1 Ground Referenced Signal Connection National Instruments Corporation 2 5 SCXI 1102 B C User Manual Chapter 2 Connecting the Signals CH 0 y CH 0 Floating V T Signal s CH 1
63. has module SCXI XXXX or 1102 B C hardware in chassis is SCXI YYYY 1102 B C or Empty complete the following troubleshooting steps to correct the error 1 Expand the list of NI DAQmx devices by clicking the next to NI DAOmx Devices 2 Right click the SCXI chassis and click Properties to load the chassis configurator 3 Under the Modules tab ensure that the cabled module is listed in the correct slot 4 Ifthe cabled module is not listed in the correct slot complete the following troubleshooting steps a If the cabled module is not listed in the correct slot and the slot is empty click the drop down listbox next to the correct slot and select the cabled module Configure the cabled module following the steps listed in the SCX7 Quick Start Guide Click OK b If another module appears where the cabled module should be click the drop down listbox next to the correct slot and select the cabled module A message box appears asking you to confirm the module replacement Click OK Configure the cabled module following the steps listed in the SCXT Quick Start Guide Click OK e Ifyou have more than one kind of SCXI module in the SCXI chassis ensure that you have the highest priority SCXI module cabled to the E M Series DAQ device Refer to the SCXT Quick Start Guide to find out which SCXI module in the chassis should be cabled to the E M Series DAQ device e After checking the preceding items return to the Troubleshooting the
64. he processor does something else DMA is the fastest method of transferring data to from computer memory Digital multimeter Digital output signal Software that controls a specific hardware device such as an E M Series DAQ device Electrically erasable programmable read only memory ROM that can be erased with an electrical signal and reprogrammed Electromagnetic compliance Electromagnetic interference G 4 ni com EXTSTROBE excitation EXT CONV EXT INT FIFO filtering FSR ft G G gain GND O National Instruments Corporation G 5 Glossary EXTSTROBE is an output only signal that generates either a single pulse or a sequence of eight pulses in the hardware strobe mode An external device can use this signal to latch signals or to trigger events In the single pulse mode software controls the level of the EXTSTROBE signal A 10 and a 1 2 microsecond clock are available for generating the pulse sequence in the hardware strobe mode Refer to the E M Series device user manual for more detailed information This functionality is not available in LabVIEW or NI DAQ EXTSTROBE is used for controlling SCXI chassis and it is not a general purpose signal If you want to use or control this signal you must perform register level programming Supplying a voltage or current source to energize an active sensor or circuit External control signal to trigger A D conversions External interrupt signal 1
65. ich you will connect the SCXI 1102 B C NI DAQ 7 0 or later is required to configure and program the SCXI 1102 B C module If you do not have NI DAQ 7 0 or later you can either contact a NI sales representative to request it on a CD or download the latest NI DAQ version from ni com May Note Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting or disconnecting any signal wires Installing the SCXI 1102 B C Module into the SCXI Chassis Refer to the SCXT Quick Start Guide to install the SCXI 1102 B C module SCXI 1102 B C User Manual 1 4 ni com Chapter 1 About the SCXI 1102 B C Connecting the SCXI 1102 B C in an SCXI Chassis to an E M Series DAQ Device for Multiplexed Scanning Refer to the SCXI Quick Start Guide to install the cable adapter and connect the SCXI modules to the E M Series DAQ device If you have already installed the appropriate software refer to Chapter 3 Configuring and Testing to configure the SCXI 1102 B C module s Connecting the SCXI 1102 B C in a PXI SCXI Combination Chassis to an E M Series DAQ Device for Multiplexed Scanning Refer to the SCXT Quick Start Guide to connect the SCXI modules to the E M Series DAQ device If you have already installed the appropriate software refer to Chapter 3 Configuring and Testing to configure the SCXI 1102 B C module s Verifying the SCXI 1102 B C Installation in Software Refer to the SCXT
66. ion For a complete list of NI DAQmx properties refer to your ADE help file ys Note Tables 5 1 5 2 and 5 3 are not complete lists of NI DAQmx properties and do not include every property you may need to configure voltage measurements It is a representative sample of important properties to configure voltage measurements For a complete list of NI DAQmx properties and more information on NI DAQmx properties refer to your ADE help file Developing Your Application in Traditional NI DAQ Legacy 3 Note Ifyou are not using an NI ADE using an NI ADE prior to version 7 0 or are using an unlicensed copy of an NI ADE additional dialog boxes from the NI License Manager appear allowing you to create a task or global channel in unlicensed mode These messages continue to appear until you install version 7 0 or later of an NI ADE This section describes how to configure and use Traditional NI DAQ Legacy to control the SCXI 1102 B C in LabVIEW LabWindows CVI Measurement Studio and other text based ADEs These NI ADEs provide greater flexibility and access to more settings than MAX but you can use ADEs in conjunction with MAX to quickly create a customized application After you have determined how you want to address the channels and whether you want to configure the SCXI 1102 B C in MAX or LabVIEW you can design your application using a typical program flow such as the one shown in Figure 5 2 National Instruments Corporation 5 13
67. ions 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 National Instruments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to reproduce software or other materials belonging to others you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction Trademarks National Instruments NI ni com and LabVIEW are trademarks of National Instruments Corporation Refer to the Terms of Use section on ni com legal for more information about National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies Members of the National Instruments Alliance Partner Program are business entities independent from National Instruments and have no agency partnership or joint venture relationship wi
68. jection ratio a measure of the ability of a differential amplifier to reject interference from a common mode signal usually expressed in decibels dB Voltage that appears on both inputs of a differential amplifier The frequency that defines the upper end of the passband of a lowpass filter Digital to analog A data acquisition device The data acquisition device data address line signal used to indicate whether the SER DAT IN 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 20log V1 V2 for signals in volts SCXI 1102 B C User Manual Glossary DC device D GND differential input DIO DMA DMM D OUT drivers driver software E EEPROM EMC EMI SCXI 1102 B C User Manual Direct current A plug in data acquisition product card or pad that can contain multiple channels and conversion devices Plug in products PCMCIA cards and devices such as DAQPads which connects to the computer parallel port are all examples of DAQ devices SCXI modules are distinct from devices Digital ground signal An analog input consisting of two terminals both of which are isolated from computer ground whose difference is measured Digital input output Direct memory access a method by which data is transferred to from computer memory from to a device or memory on the bus while t
69. l task or channel complete the following steps 1 Double click Measurement amp Automation on the desktop 2 Right click Data Neighborhood and select Create New 3 Select NI DAOmx Task or NI DAQmx Global Channel and click Next 4 Select Analog Input 5 Select one of the following e Voltage e Temperature and then select one of the following Iex Thermistor RTD Thermocouple Vex Thermistor Current 6 Ifyou are creating a task you can select a range of channels by holding down the lt Shift gt key while selecting the channels You can select multiple individual channels by holding down the lt Ctrl gt key while selecting channels If you are creating a channel you can only select one channel Click Next 7 Name the task or channel and click Finish 8 Select the channel s you want to configure You can select a range of channels by holding down the lt Shift gt key while selecting the channels You can select multiple individual channels by holding down the lt Ctrl gt key while selecting channels Sy Note If you want to add channels of various measurement types to the same task click the Add Channels button to select the measurement type for the additional channels 9 Enter the specific values for your application in the Settings tab Context help information for each setting is provided on the right side of the screen Configure the input signal range using either NI DAQmx Task or NI DAQmx Global
70. le to adjust the gain settings in the system or use the default gain settings from the configuration utility and then run the application When using virtual channels the default input limits configured in the virtual channel configurator are used You have completed a multiplexed scan using the SCXI 1102 B C This is not a comprehensive discussion of SCXI scanning using LabVIEW but this should give you enough information to help you get started with the examples shipped with these software packages C and Low Level DAQ Functions When using a C based environment you need to take several steps to configure the SCXI 1102 B C for multiplexed scanning The following procedure outlines the steps for programming with the low level NI DAQ function calls 1 Prepare the SCXI 1102 B C settings either by loading the original SCXI configuration settings using SCXI_Load_Config or by specifying all configuration settings using the NI DAQ function calls in Table 5 7 5 16 ni com Chapter 5 Using the SCXI 1102 B C Table 5 7 NI DAQ Functions Used to Configure SCXI 1102 B C Channel Setting NI DAQ Function to Use Gain SCXI_Set_Gain 2 Specify the module scan list the start channel of each module and the number of channels to scan on each module with the function SCXI_SCAN_Setup This function accepts an array of start channels and an array of the number of channels to scan in each module Therefore it is not possible to
71. list can contain channels in any physical order but the SCXI 1102 B C multiplexer can only sequence the channels in the order 0 1 31 The SCXI 1102 B C cannot skip channels or scan channels in random order The ordering of scanned channels must be sequential The scan list is limited to a total of 512 channels per E M Series DAQ device When you configure a module for multiplexed mode operation the routing of multiplexed signals to the E M Series DAQ device depends on which module in the SCXI system is cabled to the E M Series DAQ device There are several possible scenarios for routing signals from the multiplexed modules to the E M Series DAQ device If the scanned SCXI 1102 B C module is not directly cabled to the E M Series DAQ device the module sends its signals through the SCXIbus to the cabled module The cabled module whose routing is controlled by the SCXI chassis routes the SCXIbus signals to the E M Series DAQ device through the CH 0 pin on its rear signal connector National Instruments Corporation 4 3 SCXI 1102 B C User Manual Chapter 4 Theory of Operation SCXI 1102 B C User Manual If the E M Series DAQ device scans the cabled module the module routes its input signals through the CH 0 pin on its rear signal connector to the E M Series DAQ device CH 0 Multiplexed mode scanning acquisition rates have limitations that are determined based on the hardware in the system and the mode of operation The maximum multipl
72. ndows CVI C or C development environments you need to make several NI DAQ function calls to set up each module involved in the scan the chassis and the E M Series DAQ device controlling the scan A discussion describing how to implement multiplexed scanning in the different ADEs follows Refer to the ADE manual and the DAQ analog input examples that come with your application software for more detailed information on programming the SCXI modules for scanning in multiplexed mode LabVIEW and the SCXI Channel String For LabVIEW and Visual Basic 6 the channel string determines the sequence in which SCXI channels are scanned Refer to Appendix B Using SCXI Channel Strings with Traditional NI DAQ Legacy 7 0 or Later for more information about using SCXI channels strings in Traditional NI DAQ Legacy LabVIEW and the Virtual Channel String For LabVIEW and Visual Basic 6 the channel string can also contain virtual channels For the SCXI 1102 B C these virtual channels are analog input channels you create that have custom names that perform all error correction and scaling without additional code Virtual channels are particularly useful when sensors requiring different scaling factors are used on the same SCXI 1102 B C channel Using virtual channels you can use sensors needing special scaling in a generic analog input application without performing hard coded scaling If you change the scaling or want to connect a different sensor
73. nnel strings in NI DAQmx 5 10 stability specifications A 3 T theory of multiplexed operation 4 3 theory of operation 4 1 analog circuitry 4 2 digital circuitry 4 2 rear signal connector 4 2 SCXIbus connector 4 2 SCXIbus interface 4 2 theory of multiplexed operation 4 3 ni com thermistor measurement properties table 5 6 thermocouple measurement properties table 5 5 thermocouples connecting 2 9 timing and triggering adjusting 5 3 Traditional NI DAQ Legacy configuration 3 4 configuring module property pages 3 4 creating a virtual channel 3 5 CVI examples 5 17 developing applications 5 13 installing SCXT in software 1 5 manually adding modules 1 6 Measurement Studio examples 5 17 troubleshooting 1 8 typical SCXI 1102 B C program flow figure 5 14 using SCXI channel strings B 1 verifying signals 3 6 channel strings 3 6 using channel strings 3 7 using virtual channel 3 6 transfer characteristics specifications A 1 troubleshooting incorrect test and verification D 1 NI DAQmx 1 6 self test verification 1 6 Traditional NI DAQ Legacy 1 8 O National Instruments Corporation 1 7 Index V verifying installation 1 6 SCXI 1102 B C software installation 1 5 signal 3 5 NI DAQmx 3 6 Traditional NI DAQ Legacy using virtual channel 3 6 troubleshooting 1 6 D 1 virtual channel string LabVIEW 5 15 Visual Basic creating code for the SCXI 1102 B C 5 11 using SCXI chann
74. our application refer to Chapter 4 Theory of Operation Common Software Configurable Settings This section describes the most frequently used software configurable settings for the SCXI 1102 B C Refer to Chapter 4 Theory of Operation for a complete list of software configurable settings Gain Input Range Gain input range is a software configurable setting that allows you to choose the appropriate amplification to fully utilize the range of the E M Series DAQ device In most applications NI DAQ chooses and sets the gain for you determined by the input range This feature is described in Chapter 4 Theory of Operation Otherwise you should determine the appropriate gain using the input signal voltage range and the full scale limits of the SCXI 1102 B C output You can select a gain of 1 or 100 ona per channel basis CJC Source Value When using a terminal block that has a CJ sensor for thermocouple measurements you can set the CJC source as internal which scans the sensor at the beginning of each measurement and scales the readings accordingly National Instruments Corporation 3 1 SCXI 1102 B C User Manual Chapter 3 Configuring and Testing Configurable Settings in MAX B Note Ifyou are not using an NI ADE using an NI ADE prior to version 7 0 or are using an unlicensed copy of an NI ADE additional dialog boxes from the NI License Manager appear allowing you to create a task or global channel in unlicensed mode Thes
75. phs slide controls and gauge indicators NI ADEs have tools that allow you to easily save the data to files such as spread sheets for easy viewing ASCII files for universality or binary files for smaller file sizes Completing the Application After you have completed the measurement analysis and presentation of the data it is important to stop and clear the task This releases any memory used by the task and frees up the DAQ hardware for use in another task i Note In LabVIEW tasks are automatically cleared Developing an Application Using LabVIEW This section describes in more detail the steps shown in the typical program flowchart in Figure 5 1 such as how to create a task in LabVIEW and configure the channels of the SCXI 1102 B C If you need more information or for further instructions select Help VI Function amp How To Help from the LabVIEW menu bar Sy Note Except where otherwise stated the VIs in Table 5 6 are located on the Functions All Functions NI Measurements DA Qmx Data Acquisition subpalette and accompanying subpalettes in LabVIEW National Instruments Corporation 5 7 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C Table 5 6 Programming a Task in LabVIEW Flowchart Step VI or Program Step Create Task in DAQ Assistant Create a DAQmx Task Name Control located on the Controls All Controls I O DAQmx Name Controls subpalette right click it and select New Task DAQ As
76. ppear allowing you to create a task or global channel in unlicensed mode These messages continue to appear until you install version 7 0 or later of an NI ADE This section describes how to configure and use NI DAQm x to control the SCXI 1102 B C in LabVIEW LabWindows CVI and Measurement Studio These ADEs provide greater flexibility and access to more settings than MAX but you can use ADEs in conjunction with MAX to quickly create a customized application Typical Program Flowchart Figure 5 1 shows a typical program voltage measurement flowchart for creating a task to configure channels take a measurement analyze the data present the data stop the measurement and clear the task National Instruments Corporation 5 1 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C Create Task Using DAQ Assistant Create Task in DAQ Assistant or MAX Create a Task Programmatically Create Channel Hardware Timing Triggering Adjust Timing Settings Analyze Data Display Data ETN ETN Tools Yes Create Another Channel Further Configure Channels No No Configure Channels Start Measurement Read Measurement A Yes Continue Sampling y Stop Measurement Clear Task Figure 5 1 Typical Program Flowchart for Voltage Measurement Channels SCXI 1102 B C User
77. ptions table 2 3 G gain input range configuration 3 1 ground referencing of signals floating signal connection referenced to chassis ground figure 2 6 ground referenced signal connection figure 2 5 H hardware getting started 1 2 removing C 1 SCXI 1102 B C 1 2 National Instruments Corporation 1 3 Index input characteristics specifications A 1 installation application software 1 4 connecting to E M Series DAQ device for multiplexed scanning in PXI SCXI combination chassis 1 5 in SCXI chassis 1 5 NI DAQ 1 4 removing SCXI 1102 B C from Measurement amp Automation Explorer C 1 from SCXI chassis C 1 SCXI using NI DAQmx 1 5 SCXI using Traditional NI DAQ Legacy 1 5 SCXI 1102 B C 1 4 verifying and self testing 1 6 J jumper positions 2 6 L LabVIEW developing an application 5 7 programming a task table 5 8 SCXI channel string 5 15 software 1 2 questions about D 3 using a NI DAQmx channel property node 5 9 using SCXI channel strings with Traditional NI DAQ Legacy B 1 virtual channel string 5 15 SCXI 1102 B C User Manual Index LabWindows CVI 1 2 creating code for using SCXI 1102 B C 5 11 low level DAQ functions in multiplexed scanning 5 16 maximum working voltage specifications A 4 Measurement amp Automation Explorer configurable settings 3 2 removing SCXI 1520 C 1 self test verification troubleshooting 1 6 virtual channels 5 15 measurement prope
78. r information about property nodes and specific NI DAQmx properties Specifying Channel Strings in NI DAQmx SCXI 1102 B C User Manual Use the channel input of DAQmx Create Channel to specify the SCXI 1102 B C channels The input control constant has a pull down menu showing all available external channels The strings take one of the following forms e single device identifier channel number for example SC1Mod1 ch0 e multiple noncontinuous channels for example SC1Mod1 cho0 Sc1Mod1 ch4 This mode can affect the SCXI 1102 B C sample rate NI recommends scanning the channels in order e multiple continuous channels for example SC1Mod1 ch0 4 channels 0 through 4 When you have a task containing SCXI 1102 B C channels you can set the properties of the channels programmatically using the DAQmx Channel Property Node Follow the general programming flowchart or open an example to build a basic voltage measurement virtual channel You can use property nodes in LabVIEW to control configure and customize the NI DAQm x task and SCXI 1102 B C To create a LabVIEW property node complete the following steps 1 Launch LabVIEW 2 Create the property node in a new Virtual Instrument VJ or in an existing VI 5 10 ni com Chapter 5 Using the SCXI 1102 B C Open the block diagram view 4 From the Functions tool bar select NI Measurements DAQnmx Data Acquisition and select the type of property node you wish to configur
79. rties NI DAQmx current table 5 6 RTD table 5 5 thermistor table 5 6 thermocouple table 5 5 voltage table 5 4 Measurement Studio 1 2 creating code for using SCXI 1102 B C 5 12 Traditional NI DAQ Legacy CVI examples 5 17 modules configuring property pages in Traditional NI DAQ Legacy 3 4 installing 1 4 manually adding NI DAQmx 1 5 Traditional NI DAQ Legacy 1 6 multiplexed mode operation connecting to SCXI 1102 B C for E M Series DAQ device in PXI SCXI combination 1 5 in SCXI chassis 1 5 theory 4 3 SCXI 1102 B C User Manual 1 4 multiplexed scanning channel scanning 5 15 LabVIEW SCXI channel string 5 15 virtual channel string 5 15 low level DAQ functions 5 16 performing scans C and low level DAQ functions 5 16 steps 5 16 using software 5 15 multiplexing analog input signals 4 3 SCXI 1102 B C 4 3 with CH 0 signal 2 8 National Instruments documentation 1 3 NI DAQ 1 2 driver software 1 4 installation 1 4 software D 1 functions used to configure SCXI 1102 B C table 5 17 NI DAQmx configurable settings 3 2 current measurement properties table 5 6 developing applications 5 1 acquiring analyzing and presenting 5 7 adjusting timing and triggering 5 3 completing 5 7 configuring channel properties 5 4 LabVIEW 5 7 NI DAQmx channel property node 5 9 program flowchart figure 5 2 ni com programmable properties 5 13 specifying channel strings 5 10 Tradition
80. s 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 icon 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 When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury 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 parameter names Italic text denotes variables emphasis a cross reference or an introduction to a key concept Italic text 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 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 Contents Chap
81. sistant Create a Task Programmatically optional DAQmx Create Task vi located on the Functions All Functions NI Measurements DA Qmx Data Acquisition DAQmx Advanced Task Options subpalette This VI is optional if you created and configured the task using the DAQ Assistant However if you use it in LabVIEW any changes you make to the task are not saved to a task in MAX Create Virtual Channel s DAQMX Create Virtual Channel vi located on the Functions All Functions NI Measurements DAOmx Data Acquisition subpalette Use this VI to add virtual channels to the task Select the type of virtual channel based on the measurement you plan to perform Adjust Timing Settings optional DAQmx Timing vi Sample Clock by default This VI is optional if you created and configured the task using the DAQ Assistant Any timing settings modified with this VI are not saved in the DAQ Assistant They are only available for the present session Configure Channels optional NI DAQmx Channel Property Node refer to the Using a NI DAQmx Channel Property Node in LabVIEW section for more information This step is optional if you created and fully configured the channels using the DAQ Assistant Any channel modifications made with a channel property node are not saved in the task in the DAQ Assistant They are only available for the present session Start Measurement DAQmx Start Task vi Read Measurement DA
82. ter 1 About the SCXI 1102 B C What You Need to Get Started iernare aaae p a eoa 1 2 National Instruments Documentation 0 eile ee eecceseeeeeeseceseeseeeseeseeesecseeeaeeeeeaseeenaes 1 3 Installing Application Software NI DAQ and the DAQ Device 0 0 eects 1 4 Installing the SCXI 1102 B C Module into the SCXI Chassis 0 0 1 4 Connecting the SCXI 1102 B C in an SCXI Chassis to an E M Series DAQ Device for Multiplexed Scanning ee 1 5 Connecting the SCXI 1102 B C in a PXI SCXI Combination Chassis to an E M Series DAQ Device for Multiplexed Scanning 0 0 1 5 Verifying the SCXI 1102 B C Installation in Software oooconccnocnoonconcnanonnonanonncnnccnoranos 1 5 Installing SCXI Using NI DAQmx in Software eee ei eeceeeeseeee terete 1 5 Manually Adding Modules in NEDAQMX coococnccoccnnnnoncononancononononnnonncnnccnncnnos 1 5 Installing SCXI Using Traditional NI DAQ Legacy in Software 1 5 Manually Adding Modules in Traditional NI DAQ Legacy s es 1 6 Verifying and Self Testing the Installation ononcnnnnnninnnncnicnnnnconnnnncnncrnnonnos 1 6 Troubleshooting the Self Test Verification onoonnnniccnnnnonononcnncnnnconcnnncnn conc rnncnnconncnn conos 1 6 Troubleshooting in NI DAQMX oo eee ceceeenecneeesecnseceeeeaeeseeseeeasenseeaeenes 1 6 Troubleshooting in Traditional NI DAQ Legacy cooconnccicnnonconnnonconncancnnccnncnnos 1 8 Chapter 2 Connecting the Signals Front COnnector c cs
83. th National Instruments 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 WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC 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 SO
84. the resistor into the appropriate pad labeled RCLx 8 Solder the leads to the pad on the bottom side of the module 9 Slide the module back into its enclosure 10 Reinstall the rear panel 11 Reinstall the top cover and grounding screw E 2 ni com Glossary Symbol Prefix Value p pico 10 2 n nano 10 u micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 102 Numbers Symbols Percent Plus or minus Degrees Q Ohms 5 V 5 VDC source signal A D absolute accuracy AC ADE Amperes Analog to digital The maximum difference between the measured value from a data acquisition device and the true voltage applied to the input typically specified as voltage Alternating current Application development environment National Instruments Corporation G 1 SCXI 1102 B C User Manual Glossary AIGND AI Al Al AO AO AO AI HOLD COMP AI HOLD amplification AO GND AO REF bandwidth bias current bit bus SCXI 1102 B C User Manual Analog input ground signal Positive analog output channel number signal Positive input channel number signal Negative input channel number signal Data acquisition device analog output channel number Positive output channel number signal Negative output channel number signal Scan clock signal used to increment to the next channel after each DAQ device analog to digit
85. tion The SCXI 1102 B C modules have pads for transforming individual channels to current to voltage converters NI offers an SCXI process current pack of four 249 Q 0 1 5 ppm 1 4 W resistors The reference designators for the current loop resistors have the format for input channel x the resistor is RCLx For example the resistor for channel 28 is RCL28 AN Caution Before installing the resistors in the module make sure that there are no signals connected to the module front connector Before installing the module in the SCXI chassis you must install the resistors by completing the following steps 1 Ground yourself with a grounding strap or with a ground connected to the SCXI chassis 3 Note Properly grounding yourself prevents damage to the SCXI module from electrostatic discharge 2 Remove the grounding screw of the top cover 3 Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom of the module and pushing down 4 Remove the rear panel by unscrewing the two remaining screws Slide the module out of its enclosure National Instruments Corporation E 1 SCXI 1102 B C User Manual Appendix E Current Loop Receivers SCXI 1102 B C User Manual 6 Bend and trim the resistor lead as shown in Figure E 1 Be sure that the resistor does not extend more than 16 5 mm 0 65 in above the surface of the circuit board Figure E 1 Bent and Trimmed Resistor 7 Insert
86. tional 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 damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instruct
87. to the SCXI 1102 B C no changes are needed in the application All that is required is creating a different virtual channel and using its name in the channel string 3 Note You cannot mix virtual channels with the SCXI channel strings shown in the previous section National Instruments Corporation 5 15 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C To create a virtual channel for the SCXI 1102 B C insert a new analog input channel in the Data Neighborhood path in MAX name it and then follow the software prompts to create virtual position channels voltage channels or customized analog input channels For more information on virtual channels consult the MAX online help file To use virtual channels enter the name of a virtual channel into the analog input channel string If using multiple virtual channels separate them using a comma or enter them in a different index in the channel string array All scaling is done automatically by the application nye Note Since you cannot randomly scan analog input channels you must enter virtual channels in sequential order Performing a Multiplexed Scan SCXI 1102 B C User Manual To perform a multiplexed scan in your application complete the following steps 1 Open an analog input example in your ADE 2 Enter the appropriate SCXI channel string or virtual channel string into the channels parameter 3 Either enter the input limits for signals connected to the modu
88. ty Short Name Description Analog Input Temperature ALRTD Type Specifies the type of RTD RTD Type connected to the channel Analog Input Temperature ALRTD RO Specifies the resistance in ohms of RTD RO the sensor at 0 C National Instruments Corporation 5 5 SCXI 1102 B C User Manual Chapter 5 Using the SCXI 1102 B C Table 5 3 NI DAQmx RTD Measurement Properties Continued Property Short Name Description Analog Input Temperature ALRTD A Specifies the A B or C constant of RTD gt Custom A B C ALRTD B the Callendar Van Dusen equation AI RTD C when using a custom RTD type Analog Input General Properties Al Resistance Cfg Specifies the resistance Signal Conditioning Resistance configuration for the channel such Configuration as 2 wire 3 wire or 4 wire Table 5 4 NI DAQmx Thermistor Measurement Properties Property Short Name Description Analog Input Temperature Al Thrmistr R1 Specifies the resistance in ohms of Thermistor R1 the sensor at 0 C Analog Input Temperature AL Thrmistr A Specifies the A B or C constant of Thermistor Custom A B C AI Thrmistr B the Callendar Van Dusen equation AI Thrmistr C when using a custom thermistor type Table 5 5 NI DAQmx Current Measurement Properties Property Short Name Description Analog Input General Properties Signal Conditioning Current ShuntResistors Location Al
89. ult the documentation for the chassis and accessories for additional instructions and precautions To remove the SCXI 1102 B C module from a chassis complete the following steps while referring to Figure C 1 1 Power off the chassis Do not remove the SCXI 1102 B C module from a chassis that is powered on 2 If the SCXI 1102 B C is the module cabled to the E M Series DAQ device disconnect the cable National Instruments Corporation C 1 SCXI 1102 B C User Manual Appendix C Removing the SCXI 1102 B C 3 Remove any terminal block that connects to the SCXI 1102 B C 4 Rotate the thumbscrews that secure the SCXI 1102 B C to the chassis counterclockwise until they are loose but do not completely remove the thumbscrews 5 Remove the SCXI 1102 B C by pulling steadily on both thumbscrews until the module slides completely out 1 Cable 4 Terminal Block 2 SCXI Module Thumbscrews 5 SCXI Chassis Power Switch 3 SCXI 1102 B C 6 SCXI Chassis Figure C 1 Removing the SCXI 1102 B C SCXI 1102 B C User Manual C 2 ni com Common Questions This appendix lists common questions related to the use of the SCXI 1102 B C Which version of NI DAQ works with the SCXI 1102 B C and how do I get the most current version of NI DAQ You must have NI DAQ 7 0 or later Visit the NI Web site at ni com and select Download Software Drivers and Updates Search Drivers and Updates Enter the keyword NI DAQ to find the
90. umentation for your software National Instruments Documentation The SCXI 1102 B C User Manual is one piece of the documentation set for data acquisition DAQ systems You could have any of several types of manuals depending on the hardware and software in the system Use the manuals you have as follows National Instruments Corporation SCXI chassis or PXI SCXI combination chassis manual Read this manual for maintenance information on the chassis and for installation instructions The DAQ Getting Started Guide This document has information on installing NI DAQ and the E M Series DAQ device Install these before you install the SCXI module The SCXI Quick Start Guide This document contains a quick overview for setting up an SCXI chassis installing SCXI modules and terminal blocks and attaching sensors It also describes setting up the SCXI system in MAX The 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 Accessory installation guides or manuals 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 the connections The E M Series DAQ device documentation This documentation has detailed information about the E M Series DAQ de
91. use the AI Parameter VI to change all the SCXI 1102 B C configuration settings You also can change the configuration settings in NI DAQmx using NI DAQmx Tasks Are there any cabling restrictions when using an SCXI 1102 B C module with a plug in E M Series DAQ device Yes If a chassis contains an SCXI 1520 SCXI 1530 1531 or SCXI 1140 module at least one of these modules must be the cabled module A cabled module is the module connected directly to the E M Series DAQ device This ensures that a timing signal is available for use by all simultaneous sampling SCXI modules in the chassis Is a register level programming manual available for the SCXI 1102 B C NI does not support register level programming for the SCXI 1102 B C What is the power on state of the SCXI 1102 B C multiplexer analog bus switches and configuration settings The multiplexer analog bus switches and configuration settings are not in a known state immediately after power on All hardware settings are programmed automatically when beginning an acquisition in LabVIEW or a test panel in MAX Which accessories can I use to connect signals to the front of the SCXI 1102 B C module Refer to Chapter 1 About the SCXI 1102 B C for more information National Instruments Corporation D 3 SCXI 1102 B C User Manual Current Loop Receivers 3 Notes NI recommends that you use the NI 1308 with socketed shunt resistors You must remove soldered resistors for calibra
92. vice that plugs into or is connected to the computer Use this documentation for hardware installation and configuration instructions specification information about the E M Series DAQ device and application hints 1 3 SCXI 1102 B C User Manual Chapter 1 About the SCXI 1102 B C e Software documentation You may have both application software and NI DAQ software documentation National Instruments NI application software includes LabVIEW LabWindows CVI and Measurement Studio 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 complex system it is worthwhile to look through the software documentation before you configure the hardware e One or more of the following help files for software information Start Programs National Instruments NI DAQ NI DAQm x Help Start Programs National Instruments NI DAQ Traditional NI DAQ User Manual Start Programs National Instruments NI DAQ Traditional NI DAQ Function Reference Help You can download NI documents from ni com manuals To download the latest version of NI DAQ click Download Software at ni com Installing Application Software NI DAQ and the DAQ Device Refer to the DAQ Getting Started Guide packaged with the NI DAQ software to install your application software NI DAQ driver software and the E M Series DAQ device to wh

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