Page 3 - Important Information; Warranty; Patents; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The SCXI-1141, SCXI-1142, and SCXI-1143 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 e...
Page 4 - Conventions; File»Page Setup»Options; bold
Conventions 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 <3..0>. » The » symbol leads you through nested menu items and dialog box optio...
Page 5 - Contents
© National Instruments Corporation v SCXI-1141/1142/1143 User Manual Contents Chapter 1About the SCXI-1141/1142/1143 What You Need to Get Started ...................................................................................... 1-2National Instruments Documentation ................................
Page 7 - Glossary
Contents © National Instruments Corporation vii SCXI-1141/1142/1143 User Manual Appendix BRemoving the SCXI-1141/1142/1143 Module Appendix CCommon Questions Glossary Index Figures Figure 2-1. Ground-Referenced Signal Connection................................................. 2-4 Figure 2-2. Floatin...
Page 8 - Tables
Contents SCXI-1141/1142/1143 User Manual viii ni.com Tables Table 1-1. Accessories Available for the SCXI-1141/1142/1143 .......................... 1-4 Table 2-1. Front Signal Pin Assignments ............................................................... 2-2 Table 2-2. Rear Signal Pin Assignments ....
Page 10 - What You Need to Get Started; Drivers and
Chapter 1 About the SCXI-1141/1142/1143 SCXI-1141/1142/1143 User Manual 1-2 ni.com What You Need to Get Started To set up and use the SCXI-1141/1142/1143 module, you need the following: ❑ Hardware – SCXI-1141/1142/1143 module – One of the following terminal blocks: • SCXI-1304 • SCXI-1305 – An SCXI ...
Page 11 - DAQ; National Instruments Documentation
Chapter 1 About the SCXI-1141/1142/1143 © National Instruments Corporation 1-3 SCXI-1141/1142/1143 User Manual DAQ . Select the appropriate information for your application in the remaining drop-down menus and click Go . National Instruments Documentation The SCXI-1141/1142/1143 User Manual is one p...
Page 12 - Installing the Terminal Block; Accessory
Chapter 1 About the SCXI-1141/1142/1143 SCXI-1141/1142/1143 User Manual 1-4 ni.com • The following help file for software information: – Start»Programs»National Instruments»NI-DAQ» NI-DAQmx Help Installing Application Software, NI-DAQmx, and the DAQ Device Refer to the DAQ Getting Started Guide pack...
Page 13 - Installing SCXI Chassis and Modules in Software; Troubleshooting the Self-Test Verification; Troubleshooting in NI-DAQmx; Verify SCXI Chassis
Chapter 1 About the SCXI-1141/1142/1143 © National Instruments Corporation 1-5 SCXI-1141/1142/1143 User Manual Verifying the SCXI-1141/1142/1143 Installation in Software Refer to the SCXI Quick Start Guide for information on verifying the SCXI installation. Installing SCXI Chassis and Modules in Sof...
Page 15 - Connecting Signals; Front Connector
© National Instruments Corporation 2-1 SCXI-1141/1142/1143 User Manual 2 Connecting Signals This chapter describes input and output signal connections to the SCXI-1141/1142/1143 module through the front and rear signal connectors. Caution Connections that exceed any of the maximum ratings of input o...
Page 17 - Front Connector Signal Descriptions; Pins
Chapter 2 Connecting Signals © National Instruments Corporation 2-3 SCXI-1141/1142/1143 User Manual Front Connector Signal Descriptions Analog Input Channels The SCXI-1141/1142/1143 module instrumentation amplifiers can reject any common-mode voltage within their common-mode input range caused by gr...
Page 20 - Digital Input and Output
Chapter 2 Connecting Signals SCXI-1141/1142/1143 User Manual 2-6 ni.com Figure 2-4. Ground Offset AC-Coupled Signal Connection Figure 2-5. Floating AC-Coupled Signal Connection Digital Input and Output You can use the EXT CLK input pin on the front connector of the SCXI-1141/1142/1143 module to cont...
Page 21 - Rear Signal Connector
Chapter 2 Connecting Signals © National Instruments Corporation 2-7 SCXI-1141/1142/1143 User Manual Rear Signal Connector Note If you use the SCXI-1141/1142/1143 module with a National Instruments DAQ device and SCXI cable assembly, you do not need to read the remainder of this chapter. If you also ...
Page 25 - Analog Output Signal Connections; Digital I/O Signal Connections
Chapter 2 Connecting Signals © National Instruments Corporation 2-11 SCXI-1141/1142/1143 User Manual Analog Output Signal Connections Pins 3 through 17 of the rear signal connector are analog output signal pins. Pin 3 is the main output, and pin 4 is its reference signal. All eight channels are mult...
Page 26 - SCXIbus Line
Chapter 2 Connecting Signals SCXI-1141/1142/1143 User Manual 2-12 ni.com The digital output signal is pin 26. Pin 26 is SER DAT OUT and is equivalent to the SCXIbus MISO serial data output line. The digital I/O signals of the SCXI-1141/1142/1143 module correspond to the digital I/O lines of an E/M S...
Page 27 - Configuring and Testing; Common Software-Configurable Settings
© National Instruments Corporation 3-1 SCXI-1141/1142/1143 User Manual 3 Configuring and Testing This chapter discusses configuring the SCXI-1141/1142/1143 in MAX using NI-DAQmx, creating and testing a virtual channel, global channel, and/or task. Notes NI recommends that you have NI-DAQmx 8.3 or la...
Page 28 - Input Selection; Configurable Settings in MAX
Chapter 3 Configuring and Testing SCXI-1141/1142/1143 User Manual 3-2 ni.com Input Selection The front end of the SCXI-1141/1142/1143 includes a software configurable switch that allows you to programmatically connect the input channels of the SCXI-1141/1142/1143 to either the front connector or int...
Page 29 - Creating a Global Channel or Task
Chapter 3 Configuring and Testing © National Instruments Corporation 3-3 SCXI-1141/1142/1143 User Manual 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 applicati...
Page 30 - Verifying the Signal; Verifying the Signal in NI-DAQmx Using a Task or Global Channel
Chapter 3 Configuring and Testing SCXI-1141/1142/1143 User Manual 3-4 ni.com 6. If you are creating a task, you can select a range of channels by holding down the <Shift> key while selecting the channels. You can select multiple individual channels by holding down the <Ctrl> key while se...
Page 34 - Digital Control Circuitry; Input Amplifiers
Chapter 4 Theory of Operation © National Instruments Corporation 4-3 SCXI-1141/1142/1143 User Manual Digital Control Circuitry The digital control circuitry contains a Module ID (identification) register, a configuration register for the module, a gain register, and an EEPROM for storing gain-calibr...
Page 35 - Correcting Gain and Offset Errors
Chapter 4 Theory of Operation SCXI-1141/1142/1143 User Manual 4-4 ni.com In general, to provide optimum measurement resolution and noise rejection, you can select as high a gain as will not cause the output to exceed this limit. However, total harmonic distortion (THD) increases at higher output lev...
Page 36 - Lowpass Filters; Filter Theory
Chapter 4 Theory of Operation © National Instruments Corporation 4-5 SCXI-1141/1142/1143 User Manual Lowpass Filters The SCXI-1141/1142/1143 module filters are 8th-order elliptic, Bessel, and Butterworth lowpass filters, respectively. These filters are a hybrid of a switched-capacitor and a continuo...
Page 37 - Magnitude Response
Chapter 4 Theory of Operation SCXI-1141/1142/1143 User Manual 4-6 ni.com As Figure 4-2b shows, a real filter has ripple (an uneven variation in attenuation versus frequency) in the passband, a transition region between the passband and the stopband, and a stopband with finite attenuation and ripple....
Page 39 - Phase Response
Chapter 4 Theory of Operation SCXI-1141/1142/1143 User Manual 4-8 ni.com Figure 4-5. Typical Passband Responses of the SCXI-1141/1142/1143 Module Phase Response Figures 4-6 through 4-8 illustrate the phase response characteristics of the SCXI-1141/1142/1143 module filters. Figure 4-6 shows the phase...
Page 42 - Setting the Cutoff Frequency
Chapter 4 Theory of Operation © National Instruments Corporation 4-11 SCXI-1141/1142/1143 User Manual Figure 4-8. Unit Step Response of the SCXI-1141/1142/1143 Module Setting the Cutoff Frequency The cutoff frequencies of the filters in the SCXI-1141/1142/1143 module are set internally by dividing a...
Page 45 - Using the External Clock Input
Chapter 4 Theory of Operation SCXI-1141/1142/1143 User Manual 4-14 ni.com Using the External Clock Input You can set the cutoff frequencies of filters in the SCXI-1141/1142/1143 module by using the external clock input in applications that require external control of the cutoff frequency or that req...
Page 46 - DC-Correction Circuitry and Overload Recovery; Range
Chapter 4 Theory of Operation © National Instruments Corporation 4-15 SCXI-1141/1142/1143 User Manual For best results, the cutoff frequency of a particular filter should remain within this range. If the cutoff frequency goes above this range, the prefilters and postfilters interfere with signals in...
Page 47 - Filter Bypass Mode; Rear Connector Analog Outputs
Chapter 4 Theory of Operation SCXI-1141/1142/1143 User Manual 4-16 ni.com Filter Bypass Mode You can bypass the filter of any channel through software control, thus making the unfiltered signal available at the output. The input amplifiers are not bypassed. You can use the filter bypass to examine t...
Page 48 - Parallel Mode
Chapter 4 Theory of Operation © National Instruments Corporation 4-17 SCXI-1141/1142/1143 User Manual channel 0 and continues. You can program the SCXI-1141/1142/1143 module to start scans with any channel. Parallel Mode When the OUTPUT signal is configured as the rear connector output of channel 0,...
Page 49 - Developing Your Application in NI-DAQmx; Typical Program Flowchart
© National Instruments Corporation 5-1 SCXI-1141/1142/1143 User Manual 5 Using the SCXI-1141/1142/1143 Module This chapter makes suggestions for developing your application and provides basic information regarding calibration. Developing Your Application in NI-DAQmx Note If you are not using an NI A...
Page 51 - General Discussion of Typical Flowchart
Chapter 5 Using the SCXI-1141/1142/1143 Module © National Instruments Corporation 5-3 SCXI-1141/1142/1143 User Manual 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 ...
Page 52 - Configuring Channel Properties; Property
Chapter 5 Using the SCXI-1141/1142/1143 Module SCXI-1141/1142/1143 User Manual 5-4 ni.com When programmatically adjusting timing settings, you can set the task to acquire continuously, acquire a buffer of samples, or acquire one point at a time. For continuous acquisition, you must use a while loop ...
Page 55 - Completing the Application; Developing an Application Using LabVIEW; Functions»
Chapter 5 Using the SCXI-1141/1142/1143 Module © National Instruments Corporation 5-7 SCXI-1141/1142/1143 User Manual 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 pro...
Page 58 - Specifying Channel Strings in NI-DAQmx
Chapter 5 Using the SCXI-1141/1142/1143 Module SCXI-1141/1142/1143 User Manual 5-10 ni.com 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 eith...
Page 59 - DAQ Assistant
Chapter 5 Using the SCXI-1141/1142/1143 Module © National Instruments Corporation 5-11 SCXI-1141/1142/1143 User Manual 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 to modify the task...
Page 60 - Programmable NI-DAQmx Properties
Chapter 5 Using the SCXI-1141/1142/1143 Module SCXI-1141/1142/1143 User Manual 5-12 ni.com To actually create and configure the channel, you would enter something resembling the following example code: Task myTask = new NationalInstruments.DAQmx.Task(“myTaskName”); MyTask.DAQmxCreateAIVoltageChan ( ...
Page 61 - Calibration; External Calibration; Manual Calibration
Chapter 5 Using the SCXI-1141/1142/1143 Module © National Instruments Corporation 5-13 SCXI-1141/1142/1143 User Manual Calibration The SCXI-1141/1142/1143 is shipped with a calibration certificate and is calibrated at the factory to the specifications described in Appendix A, Specifications . Calibr...
Page 62 - Amplifier Characteristics
© National Instruments Corporation A-1 SCXI-1141/1142/1143 User Manual A Specifications This appendix lists the specifications for the SCXI-1141/1142/1143 module. These specifications are typical at 25 ° C unless otherwise noted. Amplifier Characteristics Number of channels ............................
Page 63 - Filter Characteristics
Appendix A Specifications SCXI-1141/1142/1143 User Manual A-2 ni.com DC gain error ..........................................±0.6% before calibration, ±0.02% after calibration 1 DC input offset ....................................... mV max Filter Characteristics Filter type SCXI-1141 module...........
Page 64 - System Noise; Module
Appendix A Specifications © National Instruments Corporation A-3 SCXI-1141/1142/1143 User Manual Bandwidth and response time System Noise THD 1 kHz ............................................... –70 dB 0–25 kHz ........................................ –60 dB Input noise ...............................
Page 65 - Stability
Appendix A Specifications SCXI-1141/1142/1143 User Manual A-4 ni.com Stability DC gain temperature coefficient.............20 ppm/ ° C Input offset drift ...................................... µV/ ° C typ µV/ ° C max AC gain temperature coefficient.............280 ppm/ ° C Digital Input/Output EXT C...
Page 66 - Physical; Maximum Working Voltage
Appendix A Specifications © National Instruments Corporation A-5 SCXI-1141/1142/1143 User Manual Physical Figure A-1. SCXI-1141/1142/1143 Dimensions Weight SCXI-1141 and SCXI-1143 ............ 623 g (22.0 oz) SCXI-1142 ...................................... 676 g (22.8 oz) I/O connectors Rear connec...
Page 67 - Environmental; Electromagnetic Compatibility
Appendix A Specifications SCXI-1141/1142/1143 User Manual A-6 ni.com Environmental Operating temperature ............................0 to 50 ° C Storage temperature ................................–20 to 70 ° C Humidity .................................................10 to 90% RH, noncondensing Max...
Page 68 - CE Compliance; Waste Electrical and Electronic Equipment (WEEE)
Appendix A Specifications © National Instruments Corporation A-7 SCXI-1141/1142/1143 User Manual CE Compliance This product meets the essential requirements of applicable European Directives, as amended for CE marking, as follows: • 73/23/EEC; Low-Voltage Directive (safety) • 89/336/EEC; Electromagn...
Page 69 - Devices and Interfaces
© National Instruments Corporation B-1 SCXI-1141/1142/1143 User Manual B Removing the SCXI-1141/1142/1143 Module This appendix describes how to remove the SCXI-1141/1142/1143 module from an SCXI chassis and from MAX. Removing the SCXI-1141/1142/1143 Module from MAX To remove a module from MAX, compl...
Page 71 - Common Questions
© National Instruments Corporation C-1 SCXI-1141/1142/1143 User Manual C Common Questions This appendix lists common questions related to the use of the SCXI-1141/1142/1143. Which version of NI-DAQ works with the SCXI-1141/1142/1143, and how do I get the most current version of NI-DAQmx? NI recommen...
Page 74 - How do I control the gain using LabVIEW?
Appendix C Common Questions SCXI-1141/1142/1143 User Manual C-4 ni.com Which accessories can I use to connect signals to the front of the SCXI-1141/1142/1143 module? For information regarding available accessories, refer to Chapter 1, About the SCXI-1141/1142/1143 . How do I control the gain using L...
Page 75 - Symbol; Symbols
© National Instruments Corporation G-1 SCXI-1141/1142/1143 User Manual Glossary Symbol Prefix Value p pico 10 – 12 n nano 10 – 9 μ micro 10 – 6 m milli 10 – 3 k kilo 10 3 M mega 10 6 G giga 10 9 T tera 10 12 Symbols ° degrees > greater than ≥ greater than or equal to < less than ≤ less than or...
Page 81 - Index
© National Instruments Corporation I-1 SCXI-1141/1142/1143 User Manual Index A A GND signal front connector (table), 2-3rear connector (table), 2-9 A OUT signal (table), 2-9AC-coupled signal connections floating (figure), 2-6ground-offset (figure), 2-6ground-referenced (figure), 2-5 adjusting timing...
