National Instruments Switch SCXI 1190 1191 User Manual

SCXI  
SCXI-1190/1191  
User Manual  
SCXI-1190/1191 User Manual  
February 2000 Edition  
Part Number 322610A-01  
 
 
Important Information  
Warranty  
The SCXI-1190 and SCXI-1191 are warranted against defects in materials and workmanship for a period of one year from the date  
of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment  
that proves to be defective during the warranty period. This warranty includes parts and labor.  
The media on which you receive National Instruments software are warranted not to fail to execute programming instructions,  
due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other  
documentation. National Instruments will, at its option, repair or replace software media that do not execute programming  
instructions if National Instruments receives notice of such defects during the warranty period. National Instruments does not  
warrant that the operation of the software shall be uninterrupted or error free.  
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of  
the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of  
returning to the owner parts which are covered by warranty.  
National Instruments believes that the information in this document is accurate. The document has been carefully reviewed  
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to  
make changes to 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. CUSTOMERS RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR  
NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. NATIONAL  
INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR  
CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. This limitation of the liability of National Instruments will  
apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments  
must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in  
performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects,  
malfunctions, or service failures caused by owner’s failure to follow the National Instruments installation, operation, or  
maintenance instructions; owner’s modification of the product; owner’s abuse, misuse, or negligent acts; and power failure or  
surges, fire, flood, accident, actions of third parties, or other events outside reasonable control.  
Copyright  
Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including  
photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written  
consent of National Instruments Corporation.  
Trademarks  
CVI, LabVIEWNational Instruments, ni.com, NI-DAQ, NI-SWITCH, PXI, and SCXIare trademarks of  
,
National Instruments Corporation.  
Product and company names mentioned herein are trademarks or trade names of their respective companies.  
WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS  
(1) NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL  
OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL  
COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE  
EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN.  
(2) IN ANY APPLICATION, INCLUDING THE ABOVE, RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS  
CAN BE IMPAIRED BY ADVERSE FACTORS, INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL  
POWER SUPPLY, COMPUTER HARDWARE MALFUNCTIONS, COMPUTER OPERATING SYSTEM SOFTWARE  
FITNESS, FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION,  
INSTALLATION ERRORS, SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS, MALFUNCTIONS OR  
FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES, TRANSIENT FAILURES OF ELECTRONIC  
SYSTEMS (HARDWARE AND/OR SOFTWARE), UNANTICIPATED USES OR MISUSES, OR ERRORS ON THE PART OF  
THE USER OR APPLICATIONS DESIGNER (ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER  
COLLECTIVELY TERMED “SYSTEM FAILURES”). ANY APPLICATION WHERE A SYSTEM FAILURE WOULD  
CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH)  
SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM  
FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNER MUST TAKE  
REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES, INCLUDING BUT NOT LIMITED TO  
BACK-UP OR SHUT DOWN MECHANISMS. BECAUSE EACH END-USER SYSTEM IS CUSTOMIZED AND DIFFERS  
FROM NATIONAL INSTRUMENTS' TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER  
MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT  
EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS, THE USER OR APPLICATION DESIGNER IS  
ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL  
INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A  
SYSTEM OR APPLICATION, INCLUDING, WITHOUT LIMITATION, THE APPROPRIATE DESIGN, PROCESS AND  
SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION.  
 
Compliance  
FCC/Canada Radio Frequency Interference Compliance*  
Determining FCC Class  
The Federal Communications Commission (FCC) has rules to protect wireless communications from interference.  
The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-  
commercial locations only) or Class B (for use in residential or commercial locations). Depending on where it is  
operated, this product could be subject to restrictions in the FCC rules. (In Canada, the Department of  
Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.)  
Digital electronics emit weak signals during normal operation that can affect radio, television, or other wireless  
products. By examining the product you purchased, you can determine the FCC Class and therefore which of the two  
FCC/DOC Warnings apply in the following sections. (Some products may not be labeled at all for FCC; if so, the  
reader should then assume these are Class A devices.)  
FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and  
undesired operation. Most of our products are FCC Class A. The FCC rules have restrictions regarding the locations  
where FCC Class A products can be operated.  
FCC Class B products display either a FCC ID code, starting with the letters EXN,  
or the FCC Class B compliance mark that appears as shown here on the right.  
Consult the FCC web site http://www.fcc.govfor more information.  
FCC/DOC Warnings  
This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the  
instructions in this manual and the CE Mark Declaration of Conformity**, may cause interference to radio and  
television reception. Classification requirements are the same for the Federal Communications Commission (FCC)  
and the Canadian Department of Communications (DOC).  
Changes or modifications not expressly approved by National Instruments could void the user’s authority to operate  
the equipment under the FCC Rules.  
Class A  
Federal Communications Commission  
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15  
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the  
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency  
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to  
radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in  
which case the user will be required to correct the interference at his own expense.  
Canadian Department of Communications  
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du  
Canada.  
Class B  
Federal Communications Commission  
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15  
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a  
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed  
and used in accordance with the instructions, may cause harmful interference to radio communications. However,  
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful  
interference to radio or television reception, which can be determined by turning the equipment off and on, the user  
is encouraged to try to correct the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
 
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
Canadian Department of Communications  
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du  
Canada.  
European Union - Compliance to EEC Directives  
Readers in the EU/EEC/EEA must refer to the Manufacturer's Declaration of Conformity (DoC) for information**  
pertaining to the CE Mark compliance scheme. The Manufacturer includes a DoC for most every hardware product  
except for those bought for OEMs, if also available from an original manufacturer that also markets in the EU, or  
where compliance is not required as for electrically benign apparatus or cables.  
*
Certain exemptions may apply in the USA, see FCC Rules §15.103 Exempted devices, and §15.105(c).  
Also available in sections of CFR 47.  
** The CE Mark Declaration of Conformity will contain important supplementary information and instructions  
for the user or installer.  
 
Conventions  
The following conventions are used in this manual:  
This icon denotes a note, which alerts you to important information.  
This icon denotes a caution, which advises you of precautions to take to  
avoid injury, data loss, or a system crash.  
This icon denotes a warning, which advises you of precautions to take to  
avoid being electrically shocked.  
bold  
Bold text denotes items that you must select or click on in the software,  
such as menu items and dialog box options. Bold text also denotes  
parameter names.  
italic  
Italic text denotes variables, emphasis, a cross reference, or an introduction  
to a key concept. This font also denotes text that is a placeholder for a word  
or value that you must supply.  
monospace  
Text in this font denotes text or characters that you should enter from the  
keyboard, sections of code, programming examples, and syntax examples.  
This font is also used for the proper names of disk drives, paths, directories,  
programs, subprograms, subroutines, device names, functions, operations,  
variables, filenames and extensions, and code excerpts.  
monospace bold  
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.  
SCXI-119X  
Refers to the both the SCXI-1190 module and the SCXI-1191 module.  
 
Chapter 1  
About the SCXI-119X....................................................................................................1-1  
Installing the Software...................................................................................................1-1  
Installing the Hardware..................................................................................................1-2  
Manually Adding Modules..............................................................................1-9  
Self-Test Verification......................................................................................1-10  
Removing the SCXI-119X.............................................................................................1-12  
Chapter 2  
Safety Instructions .........................................................................................................2-2  
RF Switching Precautions..............................................................................................2-3  
Connecting Signals ........................................................................................................2-4  
Multiplexing to RF Sources.............................................................................2-5  
Expanding the RF Multiplexer........................................................................2-6  
Appendix A  
Specifications  
Appendix B  
Common Questions  
© National Instruments Corporation  
vii  
SCXI-1190/1191 User Manual  
 
Contents  
Technical Support Resources  
Glossary  
Index  
Figures  
Removing the SCXI-119X .................................................................... 1-13  
Figure 1-3.  
Figure 2-1.  
Figure 2-2.  
Figure 2-3.  
Figure 2-4.  
SCXI-119X Module Block Diagram..................................................... 2-2  
SCXI-1190 SMB Connectors, SCXI-1191 SMA Connectors .............. 2-4  
Connecting the SCXI-119X .................................................................. 2-5  
Expanding the SCXI-119X ................................................................... 2-6  
SCXI-1190/1191 User Manual  
viii  
 
1
Installing and Configuring the  
SCXI-119X  
This manual describes the electrical and mechanical characteristics of the  
SCXI-1190 (quad 1 × 4, 50 , 1.3 GHz bandwidth) and the SCXI-1191  
(quad 1 × 4, 50 , 4 GHz bandwidth) multiplexer modules for the SCXI  
About the SCXI-119X  
This section summarizes the features and operation of the SCXI-119X  
switch modules. In addition, refer to Appendix A, Specifications,  
for detailed specifications of the switch module.  
The SCXI-119X modules are general-purpose, quad 4-channel,  
high-bandwidth multiplexing switches. The SCXI-119X uses single-pole  
double-throw, high-bandwidth relays capable of switching signals from  
DC to 1.3 GHz bandwidth (SCXI-1190) and from DC to 4 GHz bandwidth  
(SCXI-1191). The characteristic impedance of the channels is 50 . For the  
SCXI-1190, the maximum rated voltage of the switch is 24 VDC, and the  
maximum rated current is 1 A at 24 V. For the SCXI-1191, the maximum  
rated voltage of the switch is 30 VDC, and the maximum rated current is  
30 Vrms at 0.33 ADC.  
Installing the Software  
You can control the SCXI-119X programmatically in an application  
development environment (ADE) using NI-SWITCH. The supported  
ADEs include LabVIEW, LabWindows/CVI, Visual Basic, and C or C++  
environments. The following steps describe how to install your SCXI-119X  
software.  
1. Install your ADE if you have not already done so. Refer to your ADEs  
documentation for the software installation instructions.  
© National Instruments Corporation  
1-1  
SCXI-1190/1191 User Manual  
 
     
Chapter 1  
Installing and Configuring the SCXI-119X  
2. Install the NI-SWITCH software that came on a CD with your  
SCXI-119X. The CD includes the software required to configure and  
to program your SCXI-119X module.  
a. Insert your National Instruments NI-SWITCH software CD into  
the CD-ROM drive.  
b. Click Install in the installation window that will appear  
automatically.  
Note If the installation window does not appear, double-click the My Computer icon on  
your PC desktop. Find the CD drive, and double-click it. In the CD directory, double-click  
install.exe.  
Installing the Hardware  
The following section describes how to unpack, install, and connect your  
SCXI-119X for use with an SCXI chassis.  
Caution Make sure you read and understand all the safety information in this manual  
before you install an SCXI module.  
Unpacking  
Your SCXI-119X module is shipped in an antistatic package to prevent  
electrostatic discharge damage to the module. Electrostatic discharge can  
damage several components on the module. To avoid damaging the  
module, take the following precautions:  
Ground yourself through a grounding strap or by holding a grounded  
object.  
Touch the antistatic package to a metal part of your SCXI chassis  
before removing the module from the package.  
Remove the module from the package, and inspect the module for  
loose components or any other sign of damage. Notify National  
Instruments if the module appears damaged in any way. Do not install  
a damaged module into your SCXI chassis.  
Never touch the exposed pins of connectors to avoid possible  
electrostatic discharge.  
SCXI-1190/1191 User Manual  
1-2  
 
   
Chapter 1  
Installing and Configuring the SCXI-119X  
Installing the SCXI-119X Module into an SCXI Chassis  
You need the following items to complete the installation:  
SCXI-119X module  
SCXI chassis  
Follow these steps to install your SCXI-119X module into an SCXI chassis  
while referring to Figure 1-1.  
5
6
®
7
SCXI  
MAINFRAME  
8
2
1
4
3
1
2
3
Slot 1  
Slot 2  
Slot 3  
4
5
6
Slot 4  
7
8
SCXI-119X (SCXI-1191 Shown)  
SCXI Module Thumbscrews  
SCXI Chassis  
SCXI Chassis Power Switch  
Figure 1-1. Installing the SCXI-119X into an SCXI Chassis  
1. Turn off the computer that contains the DAQ device or computer-based  
instrument, or disconnect the computer from your SCXI chassis.  
2. Turn off the SCXI chassis.  
Caution Do not insert the SCXI-119X module into a chassis that is turned on as doing so  
could damage the module.  
3. Remove the protective plastic caps from the module’s thumbscrews so  
that the module will insert correctly.  
© National Instruments Corporation  
1-3  
SCXI-1190/1191 User Manual  
 
     
Chapter 1  
Installing and Configuring the SCXI-119X  
4. Insert the SCXI-119X module into slot 1. Gently guide the module into  
the module guides and push it to the back of the slot until the  
connectors make good contact. The module must be firmly engaged;  
however, do not force the module into place. If the module is not  
sliding easily into the chassis, check for correct insertion into the  
module guides.  
Note When installing the SCXI-119X module in an SCXI chassis, slot 1 should be filled  
first, then fill slot 2 with the next SCXI-119X.  
5. Insert any other SCXI modules into the remaining slots in the same  
manner as described in step 4.  
6. Secure all the SCXI-119X modules to the SCXI chassis by tightening  
both module thumbscrews.  
Connecting the SCXI-119X to a DAQ Device or Computer-Based  
Instrument  
You need the following items:  
SCXI chassis with the SCXI modules installed (Refer to the Installing  
the SCXI-119X Module into an SCXI Chassis section.)  
SCXI cable assembly, which consists of a cable adapter and a cable  
An installed National Instruments DAQ device or computer-based  
instrument that is able to control the SCXI chassis such as the NI 4060  
1/4 in. flathead screwdriver  
Consult your SCXI chassis documentation, other SCXI module  
documentation, and DAQ device or computer-based instrument  
documentation for additional instructions and warnings. Your SCXI-119X  
module and any other SCXI modules should already be installed in the  
chassis according to their installation instructions.  
You must select one of the modules in the chassis to be the cabled  
module—the module to which the SCXI cable assembly will be connected.  
If the chassis contains at least one SCXI-1140 module, select an  
SCXI-1140 as the cabled module; otherwise, select one of the remaining  
modules.  
SCXI-1190/1191 User Manual  
1-4  
 
   
Chapter 1  
Installing and Configuring the SCXI-119X  
To connect the chassis to a DAQ device for multiplexed operation,  
complete the following steps while referring to Figure 1-2:  
1. Turn off both the SCXI chassis and the computer that contains the  
DAQ device or computer-based instrument.  
2. Insert the cable adapter into the back of the SCXI chassis aligned with  
the module that is to be connected to the DAQ device or  
computer-based instrument. See your cable assembly’s installation  
guide for more specific information.  
3. Connect the cable to the back of the cable adapter, ensuring that the  
cable fits securely.  
4. Connect the other end of the cable to the DAQ device or  
computer-based instrument that you will use to control the SCXI  
system.  
5. Check the cable installation, making sure the connectors are securely  
fastened at both ends.  
6. Turn on the SCXI chassis.  
7. Turn on the computer.  
8. If you have already installed the appropriate software, you are ready to  
configure the SCXI-119X. If you have not installed the appropriate  
software, refer to the Installing the Software section.  
© National Instruments Corporation  
1-5  
SCXI-1190/1191 User Manual  
 
Chapter 1  
Installing and Configuring the SCXI-119X  
1
4
3
®
2
1
2
SCXI Chassis Power Switch  
Cable Adapter  
3
4
Cable  
DAQ Device or Computer-Based Instrument  
Figure 1-2. Connecting an SCXI Chassis to a DAQ Device or  
Computer-Based Instrument  
Connecting the SCXI-119X to a DAQ Device in a PXI Combination  
Chassis  
To connect the SCXI-119X to a DAQ device in a PXI combination chassis,  
such as the PXI-1010 or PXI-1011, you need the following items:  
PXI combination chassis with the SCXI modules installed  
National Instruments PXI MIO DAQ device, or a computer-based  
instrument that is capable of controlling SCXI, installed in the right  
most slot of the PXI section of the combination chassis  
A PXI combination chassis can use both SCXI and PXI modules at the  
same time. Because the connection between the SCXI backplane and the  
PXI backplane is made through a local bus interface to a PXI multifunction  
I/O module installed in the right most slot, no external cabling is needed to  
connect one PXI multifunction I/O module to the SCXI bus.  
SCXI-1190/1191 User Manual  
1-6  
 
     
Chapter 1  
Installing and Configuring the SCXI-119X  
You should have already installed your SCXI-119X module and any other  
SCXI modules in the chassis according to their installation instructions.  
To use the SCXI-119X module with a DAQ device or computer-based  
instrument in a PXI combination chassis, turn on the SCXI chassis.  
Consult your PXI chassis documentation, other SCXI module  
documentation, and DAQ device or computer-based instrument  
documentation for additional instructions and warnings.  
If you have already installed the appropriate software, you are ready to  
configure the SCXI-119X. If you have not installed the appropriate  
software, refer to the Installing the Software section.  
Configuration and Self-Test  
NI-SWITCH installed the Measurement & Automation Explorer icon  
on your PC desktop. This utility allows you to configure and test your  
National Instruments hardware.  
Follow these steps to configure your SCXI system:  
1. Double-click the Measurement & Automation Explorer icon on  
your PC desktop. Click the + next to Devices and Interfaces.  
If you are adding new modules to an existing chassis, go to step 4.  
If you are inserting modules into an empty chassis, go to step 2.  
2. Add a new chassis to the configured devices and interfaces by  
right-clicking on Devices and Interfaces and selecting Insert. Select  
the appropriate chassis from the list box and click OK.  
3. Configure the chassis.  
a. Select a Chassis ID. The ID is an integer value you choose to  
uniquely identify the chassis for programming and scanning.  
b. Select the Chassis Address. This selection is needed to address  
the chassis in a multichassis SCXI system. Unless you are using  
multiple chassis with the same DAQ device or computer-based  
instrument, select a chassis address of zero, which is the  
factory-default setting of all SCXI chassis. If you are using  
multiple chassis, refer to your SCXI chassis user manual for  
further information.  
c. For remote SCXI chassis, such as the SCXI 2000 or a SCXI  
chassis using SCXI 2400 modules, you also need to select the  
Baud Rate and COM Port.  
d. After completing the chassis configuration, click Next.  
© National Instruments Corporation  
1-7  
SCXI-1190/1191 User Manual  
 
 
Chapter 1  
Installing and Configuring the SCXI-119X  
You now have the choice of automatically detecting which modules are  
installed in the chassis or manually adding them.  
If you have just added the chassis to Devices and Interfaces, you can  
automatically detect new modules.  
If the chassis was already listed in Devices and Interfaces, you must  
manually add new modules.  
Go to the appropriate section that follows to continue the software  
configuration of your chassis.  
If you need further help during the configuration process, open  
Measurement & Automation Help by selecting Help»Help Topics in your  
Measurement & Automation Explorer window.  
If you selected auto-detect, you must have your chassis connected to your  
DAQ device or computer-based instrument, except in the case of a remote  
chassis, which you should connect to the computer using a serial port cable.  
Before auto-detecting modules, refer to the Connecting the SCXI-119X to  
a DAQ Device or Computer-Based Instrument section.  
To auto-detect your SCXI module(s), follow these steps:  
1. Make sure the chassis power is turned on.  
2. In the auto-detect window, select Yes under Auto-Detect Modules?  
and click Next. If your chassis is a remote SCXI chassis, go to step 5,  
otherwise go to step 3.  
3. Select your communication path, which is the device in your PC or  
PXI system directly connected to the chassis, and click Next.  
4. When the modules are detected, select the module that is connected to  
your communication device by the cable.  
5. Click Finish.  
Measurement & Automation Explorer should now recognize your SCXI  
chassis and SCXI module(s). If the software did not recognize your  
modules, check your cable connections and retry auto-detecting.  
Alternatively, try installing the modules manually before taking the  
troubleshooting measures discussed in the Troubleshooting Self-Test  
Verification section.  
SCXI-1190/1191 User Manual  
1-8  
 
 
Chapter 1  
Installing and Configuring the SCXI-119X  
Note If the Measurement & Automation Explorer recognized any module as an SCXI  
custom module, you may be using an old version of NI-DAQ, the data acquisition driver  
software. You can download the latest version of NI-DAQ for free at www.ni.com.  
Manually Adding Modules  
If you did not auto-detect your SCXI modules, you must add each of your  
modules separately. Use the following steps to manually add modules:  
1. In the auto-detect window, select No under Auto-Detect Modules?  
and click Finish.  
2. Display the list of devices and interfaces by clicking the + next to  
Devices and Interfaces.  
3. The chassis you added is now displayed in the list. Display the list of  
modules in the chassis by clicking the + next to the Chassis name.  
4. Right-click on the appropriate physical installation slot and select  
Insert.  
Note When looking at the front of the SCXI chassis, slot 1 is the left most slot.  
5. Select the module installed in that slot and click Next.  
Note If the appropriate module name does not appear on the list, you may be using an old  
version of NI-DAQ, the data acquisition driver software. You can download the latest  
version of NI-DAQ for free at www.ni.com.  
6. Configure your module as follows:  
If the selected module is physically connected to a National  
Instruments DAQ device or computer-based instrument, select  
that device by using the Connected to control. If you want this  
device to control the chassis, confirm that the checkbox labeled  
This device will control the chassis is checked.  
If the selected module is not connected to a National Instruments  
DAQ device or computer-based instrument, select none.  
In the Operating Mode box, select Multiplexed Mode.  
7. Click Finish.  
If you need to manually install more SCXI-119X modules in your chassis,  
repeat steps 3 through 6 to configure each module.  
© National Instruments Corporation  
1-9  
SCXI-1190/1191 User Manual  
 
 
Chapter 1  
Installing and Configuring the SCXI-119X  
Your SCXI chassis and SCXI module(s) should now be configured  
properly. If your configuration is complete, test the system as described in  
the Self-Test Verification section to ensure that your SCXI system is  
communicating properly with the device.  
Self-Test Verification  
To test the successful configuration of your system, complete the following  
steps:  
1. Double-click the Measurement & Automation Explorer icon on  
your PC desktop:  
2. Verify that the chassis power is on and that the chassis is correctly  
connected to a DAQ device or computer-based instrument.  
3. Display the list of devices and interfaces by clicking the + next to  
Devices and Interfaces.  
4. From the list that appears, locate the chassis you want to test.  
Right-click on the chassis and select Test.  
5. If the communication test is successful, a message The chassis has  
unsuccessful, refer to the Troubleshooting Self-Test Verification  
section.  
Your SCXI system should now operate properly with your ADE software.  
If you experience problems between your SCXI system and your ADE,  
refer to the Troubleshooting Self-Test Verification section. Additionally,  
you may find it helpful to refer to your NI-SWITCH documentation, your  
ADE software documentation, and your chassis documentation. National  
Instruments documentation is available to download free at  
Troubleshooting Self-Test Verification  
If the preceding test did not verify your chassis configuration, take the  
following steps to successfully complete system configuration:  
1. If you get the warning message Unable to test chassis at this  
time, probably you have not designated at least one module as  
connected to a DAQ device or computer-based instrument. Take the  
following troubleshooting actions:  
a. Double-click the Measurement & Automation Explorer icon  
on your PC desktop.  
b. Click the + next to Devices and Interfaces.  
SCXI-1190/1191 User Manual  
1-10  
 
   
Chapter 1  
Installing and Configuring the SCXI-119X  
c. Click the + next to your SCXI chassis to show all the SCXI  
modules.  
d. Right-click on the module that is connected to your DAQ device  
or computer-based instrument and select Properties.  
e. Change the Connected to selection from None to Connected to:  
Device x.  
2. If you get the warning message Failedto findfollowed by the  
module codes and the message Unable to communicate with  
chassis, take the following troubleshooting actions:  
a. Make sure that the SCXI chassis is powered on.  
b. Make sure the cable between the SCXI chassis and DAQ device or  
computer-based instrument is properly connected.  
c. Inspect the cable and the connectors for any bent pins.  
d. Make sure you are using the correct National Instruments cable  
assembly.  
working properly. See your DAQ device or computer-based  
3. If you get the warning message Failed to find, followed by  
module codes and then the message Instead found: module with  
ID 0Xxx, return to the Connecting the SCXI-119X to a DAQ Device  
or Computer-Based Instrument section and make sure the correct  
module is in the specified slot. Delete the incorrect module as  
described in the Removing the SCXI-119X from an SCXI Chassis  
section and then add the correct module as described in the Manually  
Adding Modules section.  
4. If you get the warning message Failed to find, followed by a  
module code and then the message Slot x is empty, check to see  
if the configured module is installed in the specified slot. If not, install  
the module by referring to the Installing the Hardware section. If the  
module is installed in the correct slot, turn off the chassis, remove the  
module as specified in the Removing the SCXI-119X from an SCXI  
Chassis section, and verify that no connector pins are bent on the rear  
signal connector. Reinstall the module, ensuring the module is fully  
inserted and properly aligned in the slot.  
5. After checking the preceding items, return to the Self-Test Verification  
section and retest your SCXI chassis.  
© National Instruments Corporation  
1-11  
SCXI-1190/1191 User Manual  
 
Chapter 1  
Installing and Configuring the SCXI-119X  
Removing the SCXI-119X  
This section describes how to remove the SCXI-119X from an SCXI  
chassis.  
Removing the SCXI-119X from an SCXI Chassis  
Make sure you read and understand all the safety information in this  
manual before you remove an SCXI module. You need the following items  
to complete this task:  
SCXI chassis with the SCXI-119X module(s) installed  
1/4 in. flathead screwdriver  
Consult the documentation for your SCXI or PXI (if you are using a  
combination chassis) chassis and accessories for additional instructions  
and warnings. To remove the SCXI-119X module from an SCXI chassis,  
follow these steps while referring to Figure 1-3:  
1. Remove all signals connected to the SCXI-119X.  
2. Turn off the SCXI chassis power.  
Caution Do not remove the SCXI-119X module from a chassis that is turned on as doing  
so could damage the module.  
3. Rotate the thumbscrews securing the SCXI-119X to the chassis  
counter-clockwise until they are loose, but do not completely remove  
the thumbscrews.  
4. Remove the SCXI-119X by pulling steadily on both thumbscrews until  
the module slides completely out.  
SCXI-1190/1191 User Manual  
1-12  
 
   
Chapter 1  
Installing and Configuring the SCXI-119X  
2
1
®
3
4
1
2
SCXI Chassis Power Switch  
SCXI Chassis  
3
4
SCXI-119X (SCXI-1191 Shown)  
SCXI Module Thumbscrews  
Figure 1-3. Removing the SCXI-119X  
Removing the SCXI-119X from Measurement & Automation Explorer  
To remove a module from Measurement & Automation Explorer, complete  
the following steps:  
1. Double-click the Measurement & Automation Explorer icon on  
your PC desktop.  
2. Display the list of installed devices and interfaces by clicking the +  
next to Devices and Interfaces.  
3. Locate the chassis in the list of installed devices. Display the list of  
modules in the chassis by clicking the + next to Chassis.  
4. Right-click on the module or chassis you want to delete and select  
Delete.  
5. You will be presented a confirmation window. Click Yes to continue  
deleting the module or chassis or No to cancel this action.  
© National Instruments Corporation  
1-13  
SCXI-1190/1191 User Manual  
 
     
Chapter 1  
Installing and Configuring the SCXI-119X  
Note Deleting an SCXI chassis deletes all modules in the chassis. All configuration  
information for these modules is also lost.  
Your SCXI chassis and/or SCXI module(s) should now be removed from  
the list of installed devices in Measurement & Automation Explorer.  
SCXI-1190/1191 User Manual  
1-14  
 
2
Using the SCXI-119X  
This chapter contains a functional overview, safety instructions, and  
connection possibilities of the SCXI-119X multiplexer module.  
Functional Overview  
The SCXI-119X modules are general-purpose, quad 4-channel,  
high-bandwidth multiplexing switches. The SCXI-1190 uses single-pole  
double-throw, high-bandwidth relays capable of switching signals from  
DC to 1.3 GHz. Functionally identical, the SCXI-1191 has a bandwidth of  
DC to 4 GHz. Figure 2-1 illustrates the key functional components of the  
SCXI-119X multiplexer module.  
© National Instruments Corporation  
2-1  
SCXI-1190/1191 User Manual  
 
       
Chapter 2  
Using the SCXI-119X  
SCXI-1190  
SCXI-1191  
Hardware  
Architecture  
Rear Signal  
Connector  
SCXIbus  
Relay Controller  
and  
Drivers  
Relay Control Bus  
comA 3A  
2A  
1A 0A  
comB 3B  
2B  
1B 0B  
comC 3C 2C 1C 0C  
comD 3D 2D 1D 0D  
Figure 2-1. SCXI-119X Module Block Diagram  
Safety Instructions  
Cautions Do not operate damaged equipment. The safety protection features built into this  
instrument can become impaired if the instrument becomes damaged in any way. If the  
instrument is damaged, do not use it until service-trained personnel can check its safety.  
If necessary, return the instrument to National Instruments for service and repair to ensure  
that its safety is not compromised.  
Do not operate this instrument in a manner that contradicts the information specified in this  
document. Misuse of this instrument could result in a shock hazard.  
Do not substitute parts or modify equipment. Because of the danger of introducing  
additional hazards, do not install unauthorized parts or modify the instrument. Return the  
instrument to National Instruments for service and repair to ensure that its safety is not  
compromised.  
SCXI-1190/1191 User Manual  
2-2  
 
     
Chapter 2  
Using the SCXI-119X  
Connections that exceed any of the maximum signal ratings on the SCXI-119X can create  
a shock or fire hazard or can damage any or all of the devices connected to the SCXI-119X.  
National Instruments is not liable for any damages or injuries resulting from incorrect  
signal connections.  
Clean the instrument and accessories by brushing off light dust with a soft, nonmetallic  
brush. Remove other contaminants with a stiff nonmetallic brush. The unit must be  
completely dry and free from contaminants before returning to service.  
RF Switching Precautions  
The SCXI-119X is a reflective switch, meaning that any channels not  
switched to the common channel are unterminated, and any signal on an  
unterminated channel is reflected to its source. For most low-power  
switching applications this reflection is not a problem. However, operation  
with an unterminated output can damage some high-power RF sources.  
Consult your RF source documentation for more information about  
connecting to unterminated channels.  
Warning Do not exceed the channel-to-ground rating of 24 V on the SCXI-1190 and  
30 Vrms or DC for the SCXI-1191. Any connections that exceed the maximum voltage for  
the SCXI-119X can result in an electrical shock hazard and damage to the switch module  
and any or all of the modules connected to the SCXI backplane. National Instruments is  
not liable for any damages or injuries resulting from exceeding maximum voltage ratings.  
Refer to Appendix A, Specifications, for specific information.  
Caution Always disconnect all signals from the front connectors and power down the  
SCXI chassis before removing the SCXI-119X from the chassis. Observe electrostatic  
discharge handling precautions during and after removal of the module, or when  
connecting and disconnecting signals on the front panel.  
Contact Protection  
Caution The contacts of the relay are rated for a life of 5 × 106 mechanical operations  
when operated with no signal or a very small signal present. At full rated power of 1 A at  
24 VDC for the SCXI-1190 or of 30 VDC at 1/3 ADC for the SCXI-1191, the life of the  
switch is downgraded to 100,000 operations. If your setup allows, it is always best to turn  
off the input signals connected to the switch module during the switching operation to  
avoid contact arcing within the switch. Switching large inductive loads can also cause  
contact arcing. In such instances, install a flyback diode or varistor across the inductance  
to protect the switch.  
© National Instruments Corporation  
2-3  
SCXI-1190/1191 User Manual  
 
   
Chapter 2  
Using the SCXI-119X  
Connecting Signals  
The SCXI-1190 has push-on SMB connectors, and the SCXI-1191 has  
screw-on SMA connectors as shown in Figure 2-2.  
N ATION AL  
IN STRUMEN TS  
N ATION AL  
IN STRUMEN TS  
Figure 2-2. SCXI-1190 SMB Connectors, SCXI-1191 SMA Connectors  
Note The power-up and reset state of the different multiplexer banks are as follows: banks  
A and C, channel 0 is connected to the COM terminal; banks B and D, channel 3 is  
connected is connected to the COM terminal.  
SCXI-1190/1191 User Manual  
2-4  
 
     
Chapter 2  
Using the SCXI-119X  
Multiplexing to RF Sources  
Figure 2-3 shows how to use the SCXI-119X to select one of four RF  
sources to be routed to a RF measurement device.  
N ATION AL  
IN STRUMEN TS  
RF Source  
1
RF Source  
2
RF Measurement Device  
• Scopes  
• Spectrum Analyzers  
• Power Meters  
RF Source  
3
RF Source  
4
Figure 2-3. Connecting the SCXI-119X  
© National Instruments Corporation  
2-5  
SCXI-1190/1191 User Manual  
 
     
Chapter 2  
Using the SCXI-119X  
Expanding the RF Multiplexer  
Figure 2-4 shows how to expand the SCXI-119X by cascading stages  
together. In the specific case of Figure 2-4, the module is used to create a  
13 to 1 multiplexer with a two-stage architecture. You can cascade several  
modules to provide even larger multiplexers. Cascading multiplexers  
increases insertion loss, creates propagation delays, and may have other RF  
effects.  
3D  
2D  
comD MUX  
1D  
0D  
D
3A  
2A  
1A  
0A  
3C  
2C  
1C  
0C  
comA MUX  
A
comC MUX  
C
3B  
2B  
1B  
0B  
comB MUX  
B
Figure 2-4. Expanding the SCXI-119X  
SCXI-1190/1191 User Manual  
2-6  
 
     
A
Specifications  
This appendix lists the specifications for the SCXI-1190 and the  
SCXI-1191 multiplexer modules. These specifications are typical at 25 °C  
unless otherwise noted.  
SCXI-1190  
Input Characteristics  
Number of relays per bank..................... 3  
Number of banks.................................... 4  
Common-mode voltage  
Channel to earth.............................. 24 VDC  
Maximum switching voltage  
AC................................................... 24 Vrms  
DC................................................... 24 VDC  
Maximum switching capacity per channel  
DC................................................... 1 A at 24 V  
AC................................................... 1 Arms at 24 V  
Maximum switching  
power per channel .................................. 24 W  
Contact on resistance (initial) ................ 100 mmax  
Contact material ..................................... Gold-clad silver  
© National Instruments Corporation  
A-1  
SCXI-1190/1191 User Manual  
 
     
Appendix A  
Specifications for SCXI-1190  
RF Performance Characteristics  
Characteristic impedance (Z0) ................50 Ω  
Insertion loss at:  
100 MHz........................................<0.4 dB  
500 MHz........................................<0.9 dB  
1.3 GHz .........................................<1.5 dB  
≤2 GHz ............................................<3 dB  
VSWR at:  
100 MHz........................................<1.15  
500 MHz........................................<1.35  
1.3 GHz .........................................<1.5  
≤2 GHz ............................................<2.5 dB  
Isolation:  
500 MHz........................................<–62 dB  
1.3 GHz .........................................<–50 dB  
≤2 GHz ............................................<–30 dB  
Rise time.................................................<300 ps  
Signal delay ............................................<3 ns  
Maximum RF carry power  
at 900 MHz......................................10 W  
Note Refer to the cautions and warning in Chapter 2, Using the SCXI-119X, for important  
information about using your SCXI-1190 with high-power signals.  
Dynamic Characteristics  
Relay operate time (at 20 °C)  
Typical.............................................15 ms  
Relay release time (at 20 °C)  
Typical.............................................15 ms  
Expected life  
Mechanical (no load).......................5 × 106 operations  
Electrical at maximum  
switching capacity ...........................105 operations  
SCXI-1190/1191 User Manual  
A-2  
 
Appendix A  
Specifications for SCXI-1190  
Caution Exceeding the maximum switching capability will decrease the expected life of  
the SCXI-1190.  
Power Requirement  
+5 VDC  
Maximum (all relays closed) .......... 600 mA  
Physical  
Dimensions............................................. 17.30 by 19.56 by 3.02 cm  
(6.81 by 7.70 by 1.19 in.)  
I/O connector.......................................... 5 SMB female per bank  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................–20 to 70 °C  
Relative humidity................................... 5% to 85% noncondensing  
Electromagnetic compatibility  
(EMC) emissions ............................ Refer to the document supplied  
with the chassis for compliance to  
relevant directives.  
EMI ................................................. FCC Class A compliant  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
© National Instruments Corporation  
A-3  
SCXI-1190/1191 User Manual  
 
Appendix A  
Specifications for SCXI-1191  
SCXI-1191  
Input Characteristics  
Number of relays per bank .....................3  
Number of banks ....................................4  
Common-mode voltage  
Channel to earth...............................30 Vrms or DC  
Maximum switching voltage  
AC....................................................30 Vrms  
DC....................................................30 VDC  
Maximum switching capacity per channel  
DC....................................................30 VDC at 0.33 ADC  
AC....................................................30 Vrms at 0.33 Arms  
Maximum switching  
power per channel...................................10 W  
Contact on resistance (initial).................200 mmax  
Contact material......................................Gold  
RF Performance Characteristics  
Characteristic impedance (Z0) ................50 Ω  
Insertion loss at:  
< 2.5 GHz ........................................< 0.6 dB  
< 4 GHz ...........................................< 0.9 dB  
VSWR at:  
< 2.5 GHz ........................................< 1.3  
< 4 GHz ...........................................< 1.5  
Isolation:  
< 2.5 GHz ........................................< –60 dB  
< 4 GHz ...........................................< –55 dB  
Maximum RF carry power  
at 900 MHz......................................10 W  
SCXI-1190/1191 User Manual  
A-4  
 
Appendix A  
Specifications for SCXI-1191  
Note Refer to the warning and cautions in Chapter 2, Using the SCXI-119X, for important  
information about using your SCXI-1191 with high-power signals.  
Dynamic Characteristics  
Relay operate time (at 20 °C)  
Typical ............................................ 15 ms  
Relay release time (at 20 °C)  
Typical ............................................ 15 ms  
Expected life  
Mechanical (no load) ...................... 5 × 106 operations  
Electrical at maximum  
switching capacity........................... 105 operations  
Caution Exceeding the maximum switching capability will decrease the expected life of  
the SCXI-1191.  
Power Requirement  
+5 VDC  
Maximum (all relays closed) .......... 950 mW  
Physical  
Dimensions............................................. 17.30 by 19.56 by 3.02 cm  
(6.81 by 7.70 by 1.19 in.)  
I/O connector.......................................... 5 SMA female per bank  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................–20 to 70 °C  
Relative humidity................................... 5% to 85% noncondensing  
Electromagnetic compatibility  
(EMC) emissions ............................ Refer to the document supplied  
with the chassis for compliance to  
relevant directives.  
EMI ................................................. FCC Class A compliant  
© National Instruments Corporation  
A-5  
SCXI-1190/1191 User Manual  
 
Appendix A  
Specifications for SCXI-1191  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
SCXI-1190/1191 User Manual  
A-6  
 
B
Common Questions  
This appendix addresses common questions you may have while using  
your SCXI-119X multiplexer module.  
The SCXI-1190 is listed to have a 1.3 GHz bandwidth. Can I use it at  
2 GHz bandwidth?  
The SCXI-1190 can definitely be used at 2 GHz, as long as the isolation,  
VSWR, and attenuation levels are acceptable for your particular  
application. Refer to Appendix A, Specifications, for a complete list of the  
parameters at 2 GHz.  
What should I do if the software detects the module but the switches do  
not switch?  
Verify that the switches do not switch by trying to close and open the  
switches. You can verify the switches’ functionality by using the  
NI-SWITCH front panel. Access the front panel by clicking on  
Start»Programs»National Instruments Switch»NI-Switch Soft  
Front Panel.  
Also be sure to check the return codes of the NI-SWITCH operation to  
ensure that there are no errors (negative value) or warnings (positive  
value).  
Finally, verify that your code is correct. For reference, see the  
examples described in the NI-SWITCH Software User Manual.  
The NI-SWITCH driver ships with several examples in source code.  
Compare your algorithm to those in the examples.  
Do I need to program the switch module myself?  
The SCXI-119X comes with the NI-SWITCH driver software, which  
exports the full functionality of the module. NI-SWITCH handles the  
complex issues of direct memory access, interrupts, and operating system  
interfacing for you. All you need to do is make high-level calls to these  
functions from your ADE.  
© National Instruments Corporation  
B-1  
SCXI-1190/1191 User Manual  
 
 
Appendix B  
Common Questions  
One of my modules doesn’t switch properly anymore. What’s wrong?  
One of the relays has probably worn out. Relays are mechanical devices  
and have a limited switching lifetime. Call National Instruments for  
information on replacing your relays.  
What is VSWR, and how does it affect my system?  
VSWR stands for Voltage Standing Wave Ratio; it is a measure of the  
reflection on a transmission line. The percentage of a signal reflected back  
to the source is equal to (VSWR-1)/(VSWR+1). This means that a VSWR  
of 1 is optimum, with no reflected signal. On higher power applications, a  
large VSWR can damage the output stage of the source. High VSWR also  
means that a large percentage of the power from the source cannot be  
delivered to the load.  
What is isolation, and why is it important?  
Isolation is a measure of the amount of cross-talk between channels. For  
example, if a 1 Vp-p signal is isolated by 40 dB to another channel, then  
10 mVp-p will be seen on the adjacent channel (in addition to the signal  
already on the channel).  
SCXI-1190/1191 User Manual  
B-2  
 
C
Technical Support Resources  
This appendix describes the comprehensive resources available to you in  
the Technical Support section of the National Instruments Web site and  
provides technical support telephone numbers for you to use if you have  
trouble connecting to our Web site or if you do not have internet access.  
NI Web Support  
To provide you with immediate answers and solutions 24 hours a day,  
365 days a year, National Instruments maintains extensive online technical  
support resources. They are available to you at no cost, are updated daily,  
and can be found in the Technical Support section of our Web site at  
Online Problem-Solving and Diagnostic Resources  
KnowledgeBase—A searchable database containing thousands of  
frequently asked questions (FAQs) and their corresponding answers or  
solutions, including special sections devoted to our newest products.  
The database is updated daily in response to new customer experiences  
and feedback.  
Troubleshooting Wizards—Step-by-step guides lead you through  
common problems and answer questions about our entire product line.  
Wizards include screen shots that illustrate the steps being described  
and provide detailed information ranging from simple getting started  
instructions to advanced topics.  
Product Manuals—A comprehensive, searchable library of the latest  
editions of National Instruments hardware and software product  
manuals.  
Hardware Reference Database—A searchable database containing  
brief hardware descriptions, mechanical drawings, and helpful images  
of jumper settings and connector pinouts.  
Application Notes—A library with more than 100 short papers  
addressing specific topics such as creating and calling DLLs,  
developing your own instrument driver software, and porting  
applications between platforms and operating systems.  
© National Instruments Corporation  
C-1  
SCXI-1190/1191 User Manual  
 
   
Appendix C  
Technical Support Resources  
Software-Related Resources  
Instrument Driver Network—A library with hundreds of instrument  
drivers for control of standalone instruments via GPIB, VXI, or serial  
interfaces. You also can submit a request for a particular instrument  
driver if it does not already appear in the library.  
Example Programs Database—A database with numerous,  
non-shipping example programs for National Instruments  
programming environments. You can use them to complement the  
example programs that are already included with National Instruments  
products.  
Software Library—A library with updates and patches to application  
software, links to the latest versions of driver software for National  
Instruments hardware products, and utility routines.  
Worldwide Support  
National Instruments has offices located around the globe. Many branch  
offices maintain a Web site to provide information on local services. You  
can access these Web sites from www.ni.com/worldwide  
If you have trouble connecting to our Web site, please contact your local  
National Instruments office or the source from which you purchased your  
National Instruments product(s) to obtain support.  
For telephone support in the United States, dial 512 795 8248. For  
telephone support outside the United States, contact your local branch  
office:  
Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20,  
Brazil 011 284 5011, Canada (Calgary) 403 274 9391,  
Canada (Ontario) 905 785 0085, Canada (Québec) 514 694 8521,  
China 0755 3904939, Denmark 45 76 26 00, Finland 09 725 725 11,  
France 01 48 14 24 24, Germany 089 741 31 30, Greece 30 1 42 96 427,  
Hong Kong 2645 3186, India 91805275406, Israel 03 6120092,  
Italy 02 413091, Japan 03 5472 2970, Korea 02 596 7456,  
Mexico (D.F.) 5 280 7625, Mexico (Monterrey) 8 357 7695,  
Netherlands 0348 433466, New Zealand 09 914 0488,  
Norway 32 27 73 00, Poland 0 22 528 94 06, Portugal 351 1 726 9011,  
Singapore 2265886, Spain 91 640 0085, Sweden 08 587 895 00,  
Switzerland 056 200 51 51, Taiwan 02 2528 7227,  
United Kingdom 01635 523545  
SCXI-1190/1191 User Manual  
C-2  
 
Glossary  
Prefix  
n-  
Meanings  
nano-  
Value  
10–9  
10–3  
106  
m-  
milli-  
M-  
mega-  
giga-  
G-  
109  
Symbols  
°
degrees  
ohms  
%
percent  
A
A
amperes  
AC  
ADE  
alternating current  
application development environment such as LabVIEW,  
LabWindows/CVI, Visual Basic, and C or C++  
C
C
Celsius  
channel  
pin or wire lead on the multiplexer to which you apply or from which you  
read the analog or digital signal. Signals can be single-ended or differential.  
D
DAQ  
data acquisition  
© National Instruments Corporation  
G-1  
SCXI-1190/1191 User Manual  
 
 
Glossary  
dB  
decibel  
DC  
direct current  
device  
a plug-in board, card, or pad that can contain multiple channels and  
conversion devices. Some examples of devices are computers,  
multimeters, multiplexers, oscillators, operator interfaces, and  
counters.  
digital multimeter  
a multifunction meter used to make measurements such as voltage, current,  
resistance frequency, temperature, and so on  
DMM  
See digital multimeter  
drivers/driver software  
software that controls a specific hardware device such as a switch card  
G
g
gram  
H
Hz  
hertz—the number of scans read or updates written per second  
I
isolation  
a measure of the amount of cross-talk between channels  
Interchangeable Visual Instrument  
inches  
IVI  
in.  
M
m
meter  
MB  
megabytes of memory  
multiplexer  
a switching device with multiple inputs that sequentially connects each  
of its inputs to its output, typically at high speeds, in order to measure  
several signals with a single analog input channel  
SCXI-1190/1191 User Manual  
G-2  
 
Glossary  
N
NI-SWITCH  
an IVI-based instrument driver that supports the National Instruments line  
of switch cards  
O
oz  
ounce  
P
PXI  
PCI with extensions for instrumentation  
radio frequency  
R
RF  
relay  
a switch that connects or disconnects the signal to a common through the  
physical movement of a metal arm  
rms  
root mean square—the square root of the average value of the square of the  
instantaneous signal amplitude; a measure of signal amplitude  
S
s
seconds  
SCXI  
Signal Conditioning eXtensions for Instrumentation—the National  
Instruments product line for conditioning low-level signals within an  
external chassis near sensors so only high-level signals are sent to DAQ  
boards in the noisy PC environment  
© National Instruments Corporation  
G-3  
SCXI-1190/1191 User Manual  
 
Glossary  
V
V
volts  
VDC  
VSWR  
volts, direct current  
Voltage Standing Wave Ratio  
W
W
watts  
SCXI-1190/1191 User Manual  
G-4  
 
Index  
A
E
auto-detection of modules, 1-8 to 1-9  
environment specifications  
SCXI-1190, A-3  
SCXI-1191, A-5  
expanding RF multiplexer, 2-6  
B
block diagram of SCXI-119X, 2-2  
H
C
hardware installation. See installation.  
certifications and compliances  
SCXI-1190, A-3  
I
SCXI-1191, A-5  
common questions, B-1 to B-2  
configuration, 1-7 to 1-11  
input characteristics  
SCXI-1190, A-1  
auto-detecting modules, 1-8 to 1-9  
manually adding modules, 1-9 to 1-10  
self-test verification, 1-10  
steps for, 1-7 to 1-8  
troubleshooting self-test verification,  
1-10 to 1-11  
SCXI-1191, A-4  
installation, 1-2 to 1-7  
connecting SCXI-119X to DAQ device  
DAQ device or computer-based  
instrument, 1-4 to 1-6  
in PXI combination chassis, 1-6 to 1-7  
removing SCXI-119X, 1-12 to 1-14  
from Measurement & Automation  
Explorer, 1-13 to 1-14  
connecting SCXI-119X to DAQ device  
DAQ device or computer-based instrument,  
1-4 to 1-6  
in PXI combination chassis, 1-6 to 1-7  
connecting signals. See signal connections.  
contact protection, 2-3  
from SCXI chassis, 1-12 to 1-13  
into SCXI chassis, 1-3 to 1-4  
software installation, 1-1 to 1-2  
unpacking, 1-2  
conventions used in manual, vi  
isolation, defined, B-2  
D
M
DAQ device. See connecting SCXI-119X to  
DAQ device.  
Measurement & Automation Explorer  
auto-detecting modules, 1-8 to 1-9  
configuration procedure, 1-7 to 1-8  
manually adding modules, 1-9 to 1-10  
removing SCXI-119X, 1-13 to 1-14  
self-test verification, 1-10  
diagnostic resources, online, C-1  
dynamic characteristics  
SCXI-1190, A-2 to A-3  
SCXI-1191, A-5  
© National Instruments Corporation  
I-1  
SCXI-1190/1191 User Manual  
 
 
Index  
troubleshooting, 1-10 to 1-11  
multiplexed operation with DAQ device, 1-5  
multiplexer, expanding, 2-6  
SCXI-1191, A-4 to A-6  
RF sources, multiplexing to, 2-5  
RF switching precautions, 2-3  
multiplexing to RF sources, 2-5  
S
N
safety instructions, 2-2 to 2-3  
SCXI chassis  
National Instruments Web support, C-1 to C-2  
NI-SWITCH software, 1-2  
installing SCXI-119X into, 1-3 to 1-4  
removing SCXI-119X from, 1-12 to 1-13  
SCXI-119X  
O
block diagram, 2-2  
online problem-solving and diagnostic  
resources, C-1  
common questions, B-1 to B-2  
configuration and self-test, 1-7 to 1-11  
connecting signals, 2-4 to 2-6  
contact protection, 2-3  
functional overview, 2-1 to 2-2  
installation, 1-2 to 1-7  
P
physical specifications  
SCXI-1190, A-3  
overview, 1-1  
SCXI-1191, A-5  
RF switching precautions, 2-3  
safety instructions, 2-2 to 2-3  
specifications  
power requirement specifications  
SCXI-1190, A-3  
SCXI-1191, A-5  
SCXI-1190, A-1 to A-3  
SCXI-1191, A-4 to A-5  
problem-solving and diagnostic resources,  
online, C-1  
self-test verification, 1-10  
troubleshooting, 1-10 to 1-11  
signal connections, 2-4 to 2-6  
expanding RF multiplexer, 2-6  
multiplexing to RF sources, 2-5  
SMA and SMB connectors (figure), 2-4  
software installation, 1-1 to 1-2  
software-related resources, C-2  
specifications  
PXI combination chassis, connecting with  
SCXI-119X, 1-6 to 1-7  
Q
questions and answers, B-1 to B-2  
R
SCXI-1190, A-1 to A-3  
reflective switch, 2-3  
certifications and compliances, A-3  
dynamic characteristics, A-2 to A-3  
environment, A-3  
removing SCXI-119X, 1-12 to 1-14  
from Measurement & Automation  
Explorer, 1-13 to 1-14  
input characteristics, A-1  
physical, A-3  
power requirement, A-3  
RF multiplexer, expanding, 2-6  
RF performance characteristics  
SCXI-1190, A-2  
RF performance characteristics, A-2  
SCXI-1190/1191 User Manual  
I-2  
 
Index  
SCXI-1191, A-4 to A-5  
certifications and compliances, A-5  
dynamic characteristics, A-5  
environment, A-5  
V
Voltage Standing Wave Ratio (VSWR), B-2  
input characteristics, A-4  
physical, A-5  
power requirement, A-5  
RF performance characteristics,  
A-4 to A-6  
W
Web support from National Instruments,  
C-1 to C-2  
online problem-solving and diagnostic  
resources, C-1  
software-related resources, C-2  
Worldwide technical support, C-2  
T
technical support resources, C-1 to C-2  
troubleshooting common problems,  
B-1 to B-2  
© National Instruments Corporation  
I-3  
SCXI-1190/1191 User Manual  
 

Multiquip Marine Lighting GB114BS BP User Manual
National Instruments Network Card SCC AO10 User Manual
NETGEAR Switch GS205 User Manual
NETGEAR Switch GSM712 User Manual
Nikon Camera Lens 1910 User Manual
Nikon Projector VT650 User Manual
Nikon Scanner SF 200 User Manual
Optimus Cassette Player SCP 96 User Manual
Panasonic Cell Phone EB X200 User Manual
Panasonic Switch EVQ11 User Manual