National Instruments Switch 1191 User Manual

SCXI  
SCXI-1190/1191/1192  
User Manual  
SCXI-1190/1191/1192 User Manual  
February 2001 Edition  
Part Number 322610B-01  
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Important Information  
Warranty  
The SCXI-1190, SCXI-1191, and SCXI-1192 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 owners failure to follow the National Instruments installation, operation, or  
maintenance instructions; owners modification of the product; owners 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, LabVIEW, National Instruments, ni.com, NI-DAQ, PXI, SCXI, and VirtualBenchare 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.  
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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.gov for 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 users 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.  
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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.  
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Conventions  
The following conventions are used in this manual:  
»
The » symbol leads you through nested menu items and dialog box options  
to a final action. The sequence File»Page Setup»Options directs you to  
pull down the File menu, select the Page Setup item, and select Options  
from the last dialog box.  
This icon denotes a note, which alerts you to important information.  
This icon denotes a caution, which advises you of precautions to take to  
avoid injury, data loss, or a system crash.  
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 SCXI-1190 module, the SCXI-1191 module, and the  
SCXI-1192 module.  
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Contents  
Chapter 1  
About the SCXI-119X....................................................................................................1-1  
Installing the Software...................................................................................................1-2  
Safety Instructions .........................................................................................................1-3  
Installing the Hardware..................................................................................................1-3  
Manually Adding Modules..............................................................................1-10  
Self-Test Verification......................................................................................1-11  
Removing the SCXI-119X.............................................................................................1-13  
Chapter 2  
Using the SCXI-119X  
Functional Overview......................................................................................................2-1  
RF Switching Precautions..............................................................................................2-3  
Connecting Signals ........................................................................................................2-5  
Multiplexing to RF Sources.............................................................................2-6  
Expanding the RF Multiplexer........................................................................2-8  
Appendix A  
Specifications  
Appendix B  
Common Questions  
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Contents  
Appendix C  
Technical Support Resources  
Glossary  
Index  
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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 SCXI-1191 (quad  
1 × 4, 50 , 4 GHz bandwidth) multiplexer modules, and the SCXI-1192  
(8-channel, SPDT, 50 , 18 GHz bandwidth) relay module for the SCXI  
bus. It also contains information concerning their installation, operation,  
and safety instructions.  
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 modules.  
The SCXI-1190/1191 modules are general-purpose, quad 4-channel,  
high-bandwidth multiplexing switches. The SCXI-1192 module is a  
general-purpose, 8-channel, SPDT, high-bandwidth relay module.  
The SCXI-119X modules use single-pole double-throw, high-bandwidth  
relays capable of switching signals from DC to 1.3 GHz bandwidth  
(SCXI-1190), from DC to 4 GHz bandwidth (SCXI-1191), and from DC to  
18 GHz bandwidth (SCXI-1192). The characteristic impedance of the  
channels is 50 .  
For the SCXI-1190, the maximum rated voltage of the switch is 24 V,  
and the maximum rated current is 1 A at 24 V. For the SCXI-1191, the  
maximum rated voltage of the switch is 30 V, and the maximum rated  
current is 0.33 A at 30 V. For the SCXI-1192, the maximum rated voltage  
of the switch is 30 V, and the maximum rated current is 2 A at 30 V.  
See Appendix A, Specifications, for full specifications.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
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. To install software for the SCXI-119X, complete the  
following:  
1. Insert your NI-SWITCH software CD into your CD-ROM drive.  
The installation window should 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  
setup.exe.  
The NI-SWITCH and NI-DMM installation window offers three  
choices:  
Install NI-DMMChoose this selection if you want to install  
only the DMM software.  
Install NI-SWITCHChoose this selection if you want to install  
only the switches software.  
Install NI-SWITCH and NI-DMMChoose this selection if  
you want to install both the DMM and switches software.  
2. Click the Install NI-SWITCH option.  
3. To install the instrument driver, VirtualBench, and application  
development examples, choose Programmatic and Interactive  
Support. To install only the instrument driver files for VirtualBench,  
choose Interactive Support Only.  
Note Choosing Interactive Support Only does not allow you to program the instrument  
with any programming languages.  
4. When installing NI-SWITCH, look at the Development  
Environments panel.  
If you click the Advanced button on this panel, you can custom  
install National Instruments drivers such as NI-DAQ, NI-IVI, and  
NI-VISA.  
If you do not want to install certain drivers, click Advanced and  
uncheck the driver(s) you do not want installed.  
If a driver is already unchecked, your computer has the same driver or  
a newer version of the driver already installed.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Note If a newer version of a driver is present on your PC, the installer will not overwrite  
the driver.  
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.  
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.  
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.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Unpacking  
Your SCXI-119X module is shipped in an antistatic package to prevent  
electrostatic damage to the module. Electrostatic discharge can damage  
several components on the module. To avoid such damage in handling the  
module, take the following precautions:  
Ground yourself using a grounding strap or by holding a grounded  
object.  
Touch the antistatic package to a metal part of your computer chassis  
before removing the module from the package.  
Caution Never touch the exposed pins of connectors.  
Remove the module from the package and inspect the module for loose  
components or any sign of damage. Notify National Instruments if the  
module appears damaged in any way. Do not install a damaged module into  
your computer.  
Store your SCXI-119X module in the antistatic envelope when not in use.  
Installing the SCXI-119X Module into an SCXI Chassis  
You need the following items to complete the installation:  
SCXI-119X module  
SCXI chassis  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Follow these steps to install your SCXI-119X module into an SCXI chassis  
while referring to Figure 1-1 and your chassis documentation:  
5
6
®
7
S
C
M
X
M
A
I
E
IN  
F
R
A
8
2
1
4
3
1
2
3
4
Slot 1  
Slot 2  
Slot 3  
Slot 4  
5
6
7
8
SCXI Chassis (SCXI-1000 Shown)  
SCXI Chassis Power Switch  
SCXI-119X (SCXI-1190 Shown)  
SCXI Module Thumbscrews  
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 powered on because  
doing so could damage the module.  
3. Remove the protective plastic caps from the thumbscrews of the  
module so that the module will insert correctly.  
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.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Note When installing the SCXI-119X module in an SCXI chassis, fill slot 1 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 for more  
information.)  
SCXI cable assembly, which consists of a cable adapter and a cable  
An installed National Instruments DAQ device or computer-based  
instrument, such as the NI 4060, that is able to control the SCXI  
chassis  
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 as the cabled  
modulethe module to which the SCXI cable assembly connects. 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.  
Note The SCXI-119X modules operate only in multiplexed mode.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
To connect the chassis to a DAQ device, complete the following steps while  
referring to Figure 1-2:  
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  
1. Power 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 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.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
5. Check the cable installation, making sure the connectors are securely  
fastened at both ends.  
6. Power on the SCXI chassis.  
7. Power 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.  
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.  
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.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Configuring and Self-Testing the SCXI-119X  
Run Measurement & Automation Explorer (MAX) to configure and test  
your SCXI-119X. If you need help during the configuration process, open  
the Measurement & Automation Help file by selecting Help»Help Topics.  
1. Double-click the Measurement & Automation Explorer icon on  
your desktop.  
2. To add a new chassis, right-click Devices and Interfaces and select  
Create New.  
3. Select the appropriate chassis from the list box and click Finish.  
4. To configure the chassis, select the Chassis ID. The chassis ID is an  
arbitrary number that you choose for use by the software to uniquely  
specify the chassis.  
5. Select the Chassis Address (refer to your SCXI Chassis User Manual  
for further information).  
For the SCXI-2000, you also need to select the Baud Rate and  
COM Port.  
You now have the choice of auto-detecting your modules or manually  
adding them depending on your application.  
Auto-Detecting Modules  
If you selected auto-detect and the chassis is not an SCXI-2000 remote  
chassis, you must have your chassis connected to your National  
Instruments device.  
Note Make sure you have your chassis powered on.  
1. Click Next.  
2. Select your communication path, except in the case of the SCXI-2000,  
and click Next.  
3. Select the module cabled to your communication path, except in the  
case of the SCXI-2000 or if your module supports Auto Cable Detect,  
and click Finish.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
Your SCXI chassis and SCXI-119X modules are now configured in the  
software with your modules. To configure the properties for a particular  
module, perform the following steps:  
1. Expand Devices and Interfaces. You can see the chassis selected in  
the list.  
2. Expand Chassis.  
3. Right-click the module you want to configure and select Properties.  
Tabs are displayed containing attributes for different properties of the  
module. You can select any tab to see and/or change any attributes.  
Manually Adding Modules  
If you selected not to auto-detect your SCXI modules, you must add each  
of your modules separately.  
1. Click Finish in the SCXI Auto-Detect window.  
2. Expand Devices and Interfaces. You will see the chassis you selected  
in the list.  
3. Expand Chassis.  
4. Right-click the slot that is cabled to your device and select Insert. For  
DAQ devices this slot is the slot cabled to the DAQ device. Select the  
module that is intended for that slot and click Next.  
5. You are now given the option to make this the module that controls the  
chassis. Select the DAQ device or computer-based instrument you  
cabled to the chassis using the Connected to: control. Confirm that  
there is a check in the checkbox labeled This device will control the  
chassis and click Next.  
6. You are presented with a series of properties for the module. Select the  
appropriate values for the attributes and click Next. After making your  
selections, click Finish.  
You are now finished configuring the slot. Configure the rest of your  
modules in the same manner.  
To remove a module or chassis, right-click on the chassis or module you  
want to remove and select Delete.  
To test the chassis configuration, right-click on the chassis and select Test.  
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Chapter 1  
Installing and Configuring the SCXI-119X  
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. Expand Devices and Interfaces.  
4. From the list of devices and interfaces that appears, locate the chassis  
you want to test. Right-click on the chassis and select Test. If the  
communication test is successful, a message The chassis has  
been verifiedappears.  
5. Click OK.  
Note If the communication test is 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  
ni.com/manuals  
Troubleshooting Self-Test Verification  
If the preceding test did not verify your chassis configuration, take the  
following steps to successfully complete system configuration:  
If you get the warning message Unable to test chassis at this  
time, verify that you have designated a module as being 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. Expand Devices and Interfaces.  
c. Expand your SCXI chassis to show all the SCXI modules.  
d. Right-click the module that is connected to your DAQ device or  
computer-based instrument and select Properties.  
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e. Change the Connected to selection from None to Connected to:  
Device x.  
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.  
e. Test your DAQ device or computer-based instrument to verify it is  
working properly. Refer to your DAQ device or computer-based  
If you get the warning message Failed to find, followed by  
module codes and then the message Instead found: module with  
ID 0Xxx:  
a. 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.  
b. Delete the incorrect module as described in the Removing the  
SCXI-119X from an SCXI Chassis section.  
c. Add the correct module as described in the Manually Adding  
If you get the warning message Failed to find, followed by a  
module code and then the message Slot x is empty:  
a. 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.  
b. If the module is installed in the correct slot, turn off the chassis,  
and remove the module as specified in the Removing the  
SCXI-119X from an SCXI Chassis section. 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.  
After checking the preceding items, return to the Self-Test Verification  
section and retest your SCXI chassis.  
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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.  
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, complete the  
following steps while referring to Figure 1-3:  
2
1
®
3
4
1
2
SCXI Chassis Power Switch  
SCXI Chassis (SCXI-1000 Shown)  
3
4
SCXI-119X (SCXI-1190 Shown)  
SCXI Module Thumbscrews  
Figure 1-3. Removing the SCXI-119X  
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Installing and Configuring the SCXI-119X  
1. Turn off the SCXI chassis power.  
2. Remove all signals connected to the SCXI-119X.  
Caution Do not remove the SCXI-119X module from a chassis that is turned on because  
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.  
Removing the SCXI-119X from Measurement & Automation Explorer  
To remove a module from MAX, complete the following steps:  
1. Double-click the Measurement & Automation Explorer icon on  
your PC desktop.  
2. Expand Devices and Interfaces. Locate the chassis in the list of  
installed devices.  
3. Expand Chassis.  
4. Right-click on the module or chassis you want to delete and select  
Delete.  
5. You are presented a confirmation window. Click Yes to continue  
deleting the module or chassis or click No to cancel this action.  
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 MAX.  
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2
Using the SCXI-119X  
This chapter contains a functional overview and connection possibilities of  
the SCXI-119X modules.  
Functional Overview  
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. The SCXI-1192 module  
is a general-purpose, 8-channel, high-bandwidth relay module; it uses  
single-pole double-throw, high-bandwidth relays capable of switching  
signals from DC to 18 GHz.  
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Chapter 2  
Using the SCXI-119X  
Figure 2-1 illustrates the key functional components of the  
SCXI-1190/1191 multiplexer modules.  
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-1190/1191 Modules Block Diagram  
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Chapter 2  
Using the SCXI-119X  
Figure 2-2 illustrates the key functional components of the SCXI-1192  
relay module.  
Rear Signal  
Connector  
SCXIbus  
Relay Controller  
com0 NC0 NO0 com1 NC1 NO1 com2 NC2 NO2 com3 NC3 NO3 com4 NC4 NO4 com5 NC5 NO5 com6 NC6 NO6 com7 NC7 NO7  
Figure 2-2. SCXI-1192 Module Block Diagram  
RF Switching Precautions  
The SCXI-119X are reflective switches, 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 Vrms or DC on the SCXI-1190,  
30 Vrms or DC for the SCXI-1191, or 30 Vrms or DC for the SCXI-1192. 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  
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Chapter 2  
Using the SCXI-119X  
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 off 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 relays are rated for a life of 5 × 106 mechanical operations  
when operated with no signal or a very small signal present. When high-power loads are  
switched, arcing can occur across the relay contacts that will reduce their useful life. See  
Appendix A, Specifications, for lifetime ratings for each module. 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.  
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Chapter 2  
Using the SCXI-119X  
Connecting Signals  
The SCXI-1190 has push-on SMB connectors, and the SCXI-1191/1192  
have screw-on SMA connectors as shown in Figure 2-3.  
NATIONAL  
NATIONAL  
NATIONAL  
INSTRUMENTS  
INSTRUMENTS  
INSTRUMENTS  
Figure 2-3. SCXI-1190 SMB Connectors, SCXI-1191/1192 SMA Connectors  
Note The power-up and reset state of the different multiplexer banks on the  
SCXI-1190/1191 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. The  
reset mode of the SCXI-1192 connects NC to COM for all relays. Because it uses latching  
relays, the SCXI-1192 does not have a specific power-up state. Its relays will retain their  
state if they lose power.  
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Using the SCXI-119X  
Multiplexing to RF Sources  
Figure 2-4 shows how to use the SCXI-1190/1191 to select one of four  
RF sources to be routed to a RF measurement device.  
NATIONAL  
INSTRUMENTS  
RF Source  
1
RF Source  
2
RF Measurement Device  
Scope  
Spectrum Analyzer  
Power Meter  
RF Source  
3
RF Source  
4
Figure 2-4. Connecting the SCXI-1190/1191  
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Chapter 2  
Using the SCXI-119X  
Figure 2-5 shows how to use the SCXI-1192 to route signals from two  
RF sources to one RF measurement device.  
NATIONAL  
INSTRUMENTS  
RF Source  
1
RF Source  
2
RF Measurement Device  
Scope  
Spectrum Analyzer  
Power Meter  
Figure 2-5. Connecting the SCXI-1192  
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Chapter 2  
Using the SCXI-119X  
Expanding the RF Multiplexer  
Figure 2-6 shows how to expand the SCXI-1190/1191 by cascading stages  
together. In the specific case of Figure 2-6, 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.  
Note Cascading multiplexers increases insertion loss, creates propagation delays, and can  
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 2-6. Expanding the SCXI-1190/1191  
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Chapter 2  
Using the SCXI-119X  
Figure 2-7 shows one possible expansion using two SCXI-1192 modules.  
In this case, the switches on two SCXI-1192 modules are interconnected to  
create a 2 × 4 matrix. Multiple configurations are possible using one or  
more SCXI-1192 modules.  
Note Cascading switches increases insertion loss, creates propagations delays, and can  
have other RF effects.  
RF  
RF  
RF  
RF  
Source 1  
Source 2  
Source 3  
Source 4  
0B  
1B  
com B  
Switch 1  
Switch 2  
Instrument  
1
Switch 0  
Switch 3  
Switch 5  
Switch 6  
Instrument  
2
Switch 4  
Switch 7  
Figure 2-7. Expanding the SCXI-1192  
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A
Specifications  
This appendix lists the specifications for the SCXI-1190, the SCXI-1191,  
and the SCXI-1192 multiplexer modules. These specifications are typical  
at 25 °C unless otherwise noted.  
SCXI-1190  
Input Characteristics  
Number of banks.................................... 4  
Number of channels per bank ................ 4  
Common-mode voltage  
Channel to earth.............................. 24 Vrms or DC  
Maximum switching voltage  
AC................................................... 24 Vrms  
DC................................................... 24 VDC  
Maximum switching capacity per channel  
AC................................................... 1 Arms at 24 Vrms  
DC................................................... 1 ADC at 24 VDC  
Maximum switching  
power per channel .................................. 24 W  
Contact on resistance (initial) ................ 100 mmax  
Contact material ..................................... Gold-clad silver  
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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  
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  
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Specifications for SCXI-1190  
Expected life  
Mechanical (no load) ...................... 5 × 106 operations  
Electrical at maximum  
switching capacity........................... 105 operations  
Caution Exceeding the maximum switching capability decreases 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 connectors........................................ 5 SMB male per bank;  
4 banks  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................20 to 70 °C  
Relative humidity................................... 10% to 90% noncondensing  
Electromagnetic Compatibility  
EMC/EMI............................................... CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
Electrical emissions................................ EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Electrical immunity................................ Evaluated to EN 61326-1:1997  
A1:1998, Table 1  
Note For full EMC and EMI compliance, you must operate this device with shielded  
cabling. See the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, click  
Declaration of Conformity at http://www.ni.com/hardref.nsf/. This website lists  
the DoCs by product family. Select the appropriate product family, followed by your  
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Appendix A  
Specifications for SCXI-1190  
product, and a link to the DoC (in Adobe Acrobat format) appears. Click the Acrobat icon  
to download or read the DoC.  
Safety  
Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA  
C22.2 No. 1010.1 for electrical measuring and test equipment.  
Installation category II1  
Pollution degree 2  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
1
Category II refers to local-level power distribution, such as that provided by a standard wall outlet.  
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Appendix A  
Specifications for SCXI-1191  
SCXI-1191  
Input Characteristics  
Number of banks.................................... 4  
Number of channels per bank ................ 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  
AC................................................... 0.33 Arms at 30 Vrms  
DC................................................... 0.33 ADC at 30 VDC  
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  
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Appendix A  
Specifications for SCXI-1191  
Isolation:  
< 2.5 GHz ........................................< 60 dB  
< 4 GHz ...........................................< 55 dB  
Maximum RF carry power  
at 900 MHz .............................................10 W  
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 decreases 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  
4 banks  
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Appendix A  
Specifications for SCXI-1191  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................20 to 70 °C  
Relative humidity................................... 10% to 90% noncondensing  
Electromagnetic Compatibility  
EMC/EMI............................................... CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
Electrical emissions................................ EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Electrical immunity................................ Evaluated to EN 61326-1:1997  
A1:1998, Table 1  
Note For full EMC and EMI compliance, you must operate this device with shielded  
cabling. See the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, click  
Declaration of Conformity at http://www.ni.com/hardref.nsf/. This website lists  
the DoCs by product family. Select the appropriate product family, followed by your  
product, and a link to the DoC (in Adobe Acrobat format) appears. Click the Acrobat icon  
to download or read the DoC.  
Safety  
Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA  
C22.2 No. 1010.1 for electrical measuring and test equipment.  
Installation category II1  
Pollution degree 2  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
1
Category II refers to local-level power distribution, such as that provided by a standard wall outlet.  
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Appendix A  
Specifications for SCXI-1192  
SCXI-1192  
Input Characteristics  
Number of relays ....................................8  
Number of channels per relay.................2  
Common-mode voltage  
Channel to earth...............................30 Vrms or DC  
Maximum switching voltage  
DC....................................................30 VDC  
Maximum carry current per channel  
DC....................................................2 A  
Maximum continuous input power per channel (continuous wave)  
13 GHz...........................................120 W  
38 GHz...........................................80 W  
812.4 GHz......................................60 W  
12.418 GHz....................................50 W  
Contact on resistance (initial).................100 mmax  
Contact material......................................Gold plate  
RF Performance Characteristics  
Characteristic impedance (Z0) ................50 Ω  
Insertion loss at:  
4 GHz ............................................≤0.2 dB  
4 to 8 GHz .......................................≤0.3 dB  
8 to 12.4 GHz ..................................≤0.4 dB  
12.4 to 18 GHz ................................≤0.5 dB  
VSWR at:  
1 GHz ............................................≤1.1  
1 to 4 GHz .......................................≤1.15  
4 to 8 GHz .......................................≤1.25  
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Specifications for SCXI-1192  
8 to 12.4 GHz.................................. ≤1.35  
12.4 to 18 GHz................................ ≤1.5  
Isolation:  
1 GHz............................................ ≤85 dB  
1 to 4 GHz....................................... ≤80 dB  
4 to 8 GHz....................................... ≤70 dB  
8 to 12.4 GHz.................................. ≤65 dB  
12.4 to 18 GHz................................ ≤60 dB  
Note Refer to the cautions and warning in Chapter 2, Using the SCXI-119X, for important  
information about using your SCXI-1192 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 5 W ............................. 5 × 106 operations (to 3 GHz,  
50 , VSWR max 1.2)  
Caution Exceeding these electrical parameters decreases the expected life of the  
SCXI-1192.  
Power Requirement  
+5 VDC  
Maximum (simultaneous  
transition of all relays) .................... 800 mA  
Physical  
Dimensions............................................. 17.30 by 19.56 by 3.02 cm  
(6.81 by 7.70 by 1.19 in.)  
I/O connector.......................................... 3 SMA female per relay  
8 relays  
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Appendix A  
Specifications for SCXI-1192  
Environment  
Operating temperature ......................... 0 to 50 °C  
Storage temperature............................. 20 to 70 °C  
Relative humidity ...................................10% to 90% noncondensing  
Electromagnetic Compatibility  
EMC/EMI ...............................................CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
Electrical emissions ................................EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Electrical immunity ................................Evaluated to EN 61326-1:1997  
A1:1998, Table 1  
Note For full EMC and EMI compliance, you must operate this device with shielded  
cabling. See the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, click  
Declaration of Conformity at http://www.ni.com/hardref.nsf/. This website lists  
the DoCs by product family. Select the appropriate product family, followed by your  
product, and a link to the DoC (in Adobe Acrobat format) appears. Click the Acrobat icon  
to download or read the DoC.  
Safety  
Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA  
C22.2 No. 1010.1 for electrical measuring and test equipment.  
Installation category II1  
Pollution degree 2  
1
Category II refers to local-level power distribution, such as that provided by a standard wall outlet.  
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B
Common Questions  
This appendix addresses common questions you may have while using  
your SCXI-119X switching 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 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.  
One of my modules doesnt switch properly anymore. Whats wrong?  
One of the relays may have worn out. Relays are mechanical devices and  
have a limited switching lifetime. Call National Instruments for  
information on replacing your relays.  
© National Instruments Corporation  
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Appendix B  
Common Questions  
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 crosstalk between channels in a  
bank. 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). Higher channel-to-channel isolation  
results in lower crosstalk.  
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C
Technical Support Resources  
Web Support  
National Instruments Web support is your first stop for help in solving  
installation, configuration, and application problems and questions. Online  
problem-solving and diagnostic resources include frequently asked  
questions, knowledge bases, product-specific troubleshooting wizards,  
manuals, drivers, software updates, and more. Web support is available  
through the Technical Support section of ni.com  
NI Developer Zone  
The NI Developer Zone at ni.com/zone is the essential resource for  
building measurement and automation systems. At the NI Developer Zone,  
you can easily access the latest example programs, system configurators,  
tutorials, technical news, as well as a community of developers ready to  
share their own techniques.  
Customer Education  
National Instruments provides a number of alternatives to satisfy your  
training needs, from self-paced tutorials, videos, and interactive CDs to  
instructor-led hands-on courses at locations around the world. Visit the  
Customer Education section of ni.com for online course schedules,  
syllabi, training centers, and class registration.  
System Integration  
If you have time constraints, limited in-house technical resources, or other  
dilemmas, you may prefer to employ consulting or system integration  
services. You can rely on the expertise available through our worldwide  
network of Alliance Program members. To find out more about our  
Alliance system integration solutions, visit the System Integration section  
of ni.com  
© National Instruments Corporation  
C-1  
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Appendix C  
Technical Support Resources  
Worldwide Support  
National Instruments has offices located around the world to help address  
your support needs. You can access our branch office Web sites from the  
Worldwide Offices section of ni.com. Branch office Web sites provide  
up-to-date contact information, support phone numbers, e-mail addresses,  
and current events.  
If you have searched the technical support resources on our Web site and  
still cannot find the answers you need, contact your local office or National  
Instruments corporate. Phone numbers for our worldwide offices are listed  
at the front of this manual.  
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Glossary  
Prefix  
n-  
Meanings  
nano-  
Value  
109  
103  
106  
m-  
milli-  
M-  
mega-  
giga-  
G-  
109  
Symbols  
°
degrees  
ohms  
%
percent  
A
A
amperes  
AC  
ADC  
ADE  
alternating current  
amperes, direct current  
application development environment such as LabVIEW,  
LabWindows/CVI, Visual Basic, and C or C++  
Arms  
amperes, root-mean-square  
C
C
Celsius  
channel  
pin or wire lead on the switch to which you apply or from which you read  
the analog or digital signal. Signals can be single-ended or differential.  
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Glossary  
D
DAQ  
data acquisition  
decibel  
dB  
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  
H
Hz  
hertzthe number of scans read or updates written per second  
I
isolation  
a measure of the amount of cross-talk between channels  
Interchangeable Virtual Instrument  
inches  
IVI  
in.  
M
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  
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Glossary  
N
NI-SWITCH  
an IVI-based instrument driver that supports the National Instruments line  
of switch cards  
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 squarethe 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 Instrumentationthe 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  
V
V
volts  
VDC  
Vp-P  
volts, direct current  
volts peak to peak  
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Glossary  
Vrms  
volts, root-mean-square  
VSWR  
Voltage Standing Wave Ratio  
W
W
watts  
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Index  
A
D
auto-detection of modules, 1-9 to 1-10  
DAQ device. See connecting SCXI-119X to  
DAQ device.  
dynamic characteristics  
SCXI-1190, A-2 to A-3  
SCXI-1191, A-6  
B
block diagrams  
SCXI-1190/1191, 2-2  
SCXI-1192, 2-2  
SCXI-1192, A-9  
E
C
electromagnetic compatibility  
SCXI-1190, A-3  
certifications and compliances  
SCXI-1190, A-4  
SCXI-1191, A-7  
SCXI-1191, A-7  
SCXI-1192, A-10  
common questions, B-1 to B-2  
configuration, 1-9 to 1-12  
environment specifications  
SCXI-1190, A-3  
auto-detecting modules, 1-9 to 1-10  
manually adding modules, 1-10  
procedure for, 1-9  
SCXI-1191, A-7  
SCXI-1192, A-10  
expanding RF multiplexer, 2-8 to 2-9  
self-test verification, 1-11  
troubleshooting self-test  
verification, 1-11 to 1-12  
F
connecting SCXI-119X to DAQ device  
DAQ device or computer-based  
instrument, 1-6 to 1-8  
in PXI combination chassis, 1-8  
connecting signals, 2-5 to 2-9  
expanding RF multiplexer, 2-8 to 2-9  
multiplexing to RF sources, 2-6 to 2-7  
SMA and SMB connectors (figure), 2-5  
contact protection, 2-4  
functional overview, 2-1 to 2-3  
H
hardware installation. See installation.  
I
input characteristics  
SCXI-1190, A-1  
SCXI-1191, A-5  
SCXI-1192, A-8  
conventions used in manual, vi  
customer education, C-1  
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Index  
installation, 1-2 to 1-8  
power requirement specifications  
SCXI-1190, A-3  
connecting SCXI-119X to DAQ device  
DAQ device or computer-based  
instrument, 1-6 to 1-8  
SCXI-1191, A-6  
SCXI-1192, A-9  
in PXI combination chassis, 1-8  
removing SCXI-119X, 1-13 to 1-14  
from Measurement & Automation  
Explorer, 1-14  
from SCXI chassis, 1-13 to 1-14  
into SCXI chassis, 1-4 to 1-6  
software installation, 1-2 to 1-3  
unpacking, 1-4  
PXI combination chassis, connecting with  
SCXI-119X, 1-8  
Q
questions and answers, B-1 to B-2  
R
isolation, defined, B-2  
reflective switch, 2-3  
removing SCXI-119X, 1-13 to 1-14  
from Measurement & Automation  
Explorer, 1-14  
from SCXI chassis, 1-13 to 1-14  
RF multiplexer, expanding, 2-8 to 2-9  
RF performance characteristics  
SCXI-1190, A-2  
M
Measurement & Automation Explorer (MAX)  
auto-detecting modules, 1-9 to 1-10  
configuration procedure, 1-9  
manually adding modules, 1-10  
removing SCXI-119X, 1-14  
SCXI-1191, A-5 to A-6  
self-test verification, 1-11  
SCXI-1192, A-8 to A-9  
RF sources  
troubleshooting, 1-11 to 1-12  
multiplexing  
multiplexing to, 2-6 to 2-7  
RF switching precautions, 2-3 to 2-4  
expanding RF multiplexer, 2-8 to 2-9  
multiplexing to RF sources, 2-6 to 2-7  
S
safety  
N
NI Developer Zone, C-1  
NI-SWITCH software, 1-2  
contact protection, 2-4  
RF switching precautions, 2-3 to 2-4  
safety instructions, 1-3  
safety specifications  
P
physical specifications  
SCXI-1190, A-3  
SCXI-1191, A-6  
SCXI-1192, A-9  
SCXI-1190, A-4  
SCXI-1191, A-7  
SCXI-1192, A-10  
SCXI chassis  
installing SCXI-119X into, 1-4 to 1-6  
removing SCXI-119X from, 1-13 to 1-14  
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Index  
SCXI-119X  
block diagrams, 2-2 to 2-3  
electromagnetic compatibility, A-7  
environment, A-7  
input characteristics, A-5  
physical, A-6  
power requirement, A-6  
RF performance characteristics,  
A-5 to A-6  
common questions, B-1 to B-2  
configuration and self-test, 1-9 to 1-12  
connecting signals, 2-5 to 2-9  
contact protection, 2-4  
functional overview, 2-1 to 2-3  
installation, 1-2 to 1-8  
safety, A-7  
SCXI-1192, A-8 to A-10  
dynamic characteristics, A-9  
electromagnetic compatibility, A-10  
environment, A-10  
overview, 1-1  
RF switching precautions, 2-3 to 2-4  
safety instructions, 1-3  
specifications  
input characteristics, A-8  
physical, A-9  
SCXI-1190, A-1 to A-4  
SCXI-1191, A-5 to A-7  
power requirements, A-9  
RF performance characteristics,  
A-8 to A-9  
SCXI-1192, A-8 to A-10  
self-test verification  
procedure for, 1-11  
safety, A-10  
system integration, by National Instruments,  
C-1  
troubleshooting, 1-11 to 1-12  
signal connections, 2-5 to 2-9  
expanding RF multiplexer, 2-8 to 2-9  
multiplexing to RF sources, 2-6 to 2-7  
SMA and SMB connectors (figure), 2-5  
software installation, 1-2 to 1-3  
specifications  
T
technical support resources, C-1 to C-2  
troubleshooting common problems,  
B-1 to B-2  
SCXI-1190, A-1 to A-4  
certifications and compliances, A-4  
dynamic characteristics, A-2 to A-3  
electromagnetic compatibility, A-3  
environment, A-3  
input characteristics, A-1  
physical, A-3  
V
Voltage Standing Wave Ratio (VSWR), B-2  
power requirement, A-3  
RF performance characteristics, A-2  
safety, A-4  
W
Web support from National Instruments, C-1  
Worldwide technical support, C-2  
SCXI-1191, A-5 to A-7  
certifications and compliances, A-7  
dynamic characteristics, A-6  
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