RSI05_0e
Products: R&S® Network Analyzer ZVL, ZVA, ZVB, ZVT
Balanced Reflection Measurement
with R&S® ZVL
Application Note
This application note describes how to measure balanced reflection mixed mode S-Parameters with a 2®
port Network Analyzer like R&S ZVL. The application note directly transfers S-Parameter Trace Data from
®
R&S Network Analyzers to Microsoft™ Excel™ using a direct connection like GPIB or LAN and does the
mode conversion to Mixed Mode inside Excel™ with a VBA Macro.
Subject to change – J. Butz, 11.07 – RSI05_0E
Overview
Contents
1. Overview ................................................................................................. 3
2. Preparation.............................................................................................. 3
2.1.
GPIB for Control PC ........................................................... 4
2.2.
Preparations for LAN: RSIB32.dll ....................................... 4
2.3.
LAN/Ethernet ...................................................................... 5
2.3.1. ZVL .................................................................................. 6
2.3.2. ZVA, ZVB, ZVT ................................................................ 7
2.4.
LAN/Ethernet using direct Crossover connection between
PC and Network Analyzer .................................................................. 8
3. Operation of the ZVx_Balanced.xls Tool................................................. 8
3.1.
Screen of ZVx_Balanced-Tool............................................ 9
3.1.1. Resource String of instrument ......................................... 9
3.1.2. Instrument Identification ................................................ 10
3.1.3. Instrument Execution Button for download of trace data10
3.1.4. Frequency List ............................................................... 11
3.1.5. Magnitude (dB) and Phase parameter of Mixed Mode SParameter Trace Data ................................................................ 11
3.2.
Graphical Result View in Excel™ ..................................... 11
3.2.1. Example: View for Sdd11 .............................................. 12
4. Hardware and Software Requirements ................................................. 13
4.1.
PC Hardware Requirements............................................. 13
4.2.
PC Software Requirements .............................................. 13
5. Literature ............................................................................................... 13
6. Additional Information ........................................................................... 13
7. Ordering information ............................................................................. 14
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Overview
1. Overview
This application note describes how to measure balanced reflection mixed
mode S-Parameters with a 2-port Network Analyzer like ZVL. The
®
application note directly transfers S-Parameter Trace Data from R&S
Network Analyzers to Microsoft™ Excel™ using a direct connection like
GPIB or LAN and does the mode conversion to Mixed Mode inside Excel™
with a VBA Macro.
Prerequisites are a PC running Microsoft Excel™, a R&S® Network
analyzer like ZVL, ZVA, ZVB or ZVT as well as a working remote control
connection between PC and instrument like GPIB or LAN/Ethernet. .
The following abbreviations are used in the text for R&S® test equipment:
ZVA
R&S® ZVA Vector Network Analyzer
ZVB
R&S® ZVB Vector Network Analyzer
ZVL
R&S® ZVL Vector Network Analyzer
ZVT
R&S® ZVT Vector Network Analyzer
R&S
Rohde & Schwarz GmbH und Co. KG
2. Preparation
In order to use this application note, you need a remote control connection
between the PC operating MS Excel™and the R&S® Network Analyzer.
There are following possibilities for this connection:
1. GPIB
2. LAN/Ethernet using Intranet or Internet
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Preparation
3. LAN/Ethernet using direct LAN or Crosslink LAN connection between
PC and Network Analyzer
2.1. GPIB for Control PC
In order to use the GPIB interface, your PC must be equipped with a GPIB
interface hardware.
In addition, the remote control library “VISA” needs to be installed on the
PC. The VISA library is available e.g. at www.nationalinstruments.com
2.2. Preparations for LAN: RSIB32.dll
This Application Note shows how to use remote control of Rohde &
Schwarz Network Analyzers over a local area network. Rohde & Schwarz
VXIpnp instrument drivers are based on VISA. Instrument Drivers as well
as this Trace-To-Excel application can control the instrument via LAN if the
RSIB interface and passport are installed.
The RSIB interface is a R&S® defined protocol that uses the TCPIP
protocol for communication with the instrument. It consists of a set of I/O
functions very similar to the National Instruments NI-488.2 interface for
GPIB.
The following table shows some corresponding functions:
A more detailed explanation of RSIB can be found in the Rohde&Schwarz
application note 1EF47, “Remote Control of R&S® Spectrum and Network
Analyzers via LAN”. This application note is available at www.rohdeschwarz.com/appnote/1EF47.html. The application note comes together
with the RSIB Passport as well as the necessary RSIB.dll library.
Please install the RSIB Passport according to application note 1EF47.
Make sure the RSIB32.dll library is available in the Windows System folder
of your remote control PC.
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Preparation
2.3. LAN/Ethernet
Both, PC and Instrument must be connected to the Local Area Network
LAN and have a valid IP address inside the LAN. You can check the IP
adress of your PC from the Windows Control Panel inside the Network
Connections.
For the R&S Network Analyzer instrument, please check first if the
automatic assignment of an IP address (DHCP) is activated.
-
In case of ZVA, ZVB or ZVT, Press the “Windows” button on
the ZVx frontpanel in order to display the Windows Taskbar
-
In case of ZVL, access Windows XP using an external
keyboard
-
Open Start->Settings->Network
Network Connection
-
In the dialog, select “Internet Protocol (TCP/IP) and go to
Connections->Local
Area
“Properties”
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Preparation
- Make sure that the settings are “Obtain IP address automatically” and
“Obtain DNS address automatically”
After confirmation of the automatic network settings, please check the
obtained Network Analyzer IP address. You can do this in the following way:
2.3.1. ZVL
To check the IP address, proceed as follows:
1.
2.
3.
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Press hardkey “Setup”
Press softkey “General Setup”
Press softkey “IP Address” to display the ZVL IP address
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Preparation
2.3.2. ZVA, ZVB, ZVT
-
Press Info Button
-
Press the softkey “Hardware Info”
-
Now you can find the IP address of the analyzer below the “IP
adresses” section
Please note that the ZVA, ZVB or ZVT instrument has two LAN ports.
Depending on the port you are using, please use the first or second IP
adress in the Hardware info field.
-
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Final preparation step: Make sure that you have the LAN
remote control library RSIB32.dll installed on your PC remote
computer (see section 2.2).
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Operation of the ZVx_Balanced.xls Tool
2.4. LAN/Ethernet using direct Crossover connection between
PC and Network Analyzer
You can also directly connect your remote PC to the ZVx Network Analyzer
instrument by means of a normal LAN cable or by a crossover LAN cable.
A crossover LAN cable has same connector types as a normal LAN cable,
however the wires inside the crossover cable are crossed.
3. Operation of the ZVx_Balanced.xls Tool
This application note comes with an Excel™file tool which enables you to
directly transfer S-parameter trace data from Instrument to Excel™ and
which does the mode conversion to Mixed Mode S-Parameters.
The mode conversion algorithm is documented in literature, see. e.g. [2] for
the theoretical background an an algorithm explanation.
The supplied Excel-file ZVx_Balanced.xls consists of a spreadsheet and a
software macro function written in Visual Basic for Applications VBA.
When opening the file ZVx_Balanced.xls, you will be asked to enable the
macros. Attention: It is absolutely necessary to press “Enable Macro” here.
The tool will not work without the macros.
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Operation of the ZVx_Balanced.xls Tool
3.1. Screen of ZVx_Balanced-Tool
After opening the Excel™tool, you will find see a spreadsheet as shown
below:
The spreadsheet consists of following elements:
-
Resource String
-
Instrument Identification
-
Execution Button for download of trace data
-
Frequency List
-
Magnitude and Phase of Mixed Mode S-Parameter Trace Data (Sdd11,
Sdc11, Scd11, Scc11)
3.1.1. Resource String of instrument
This string is located in cell “B1” of the Excel™spreadsheet (green color).
Depending on the interface type, a different resource string is used to
address the instrument.
GPIB Interface:
Use Resource String “GPIB0::20::INSTR”, where “GPIB0” = Name of
GPIB interface and “20” = GPIB address of Network Analyzer
LAN Interface:
Use Resource String “RSIB::89.13.1.241::INSTR”, where “RSIB” = Name
of interface, don’t change, and “89.13.1.241” = actual IP address of your
network Analyzer
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Operation of the ZVx_Balanced.xls Tool
3.1.2. Instrument Identification
This string is located in cell “B2” of the Excel™spreadsheet (light blue
color). The instrument identification string shows instrument type, model,
serial number as well as FW version. The string is updated after each trace
download from the instrument.
In the neighboring cell “C2”, you can find the detected number of ports
(orange color).
In case of any problem with the instrument connection, there will be the
message “Instrument not found” in this cell.
The string corresponds to the return value of the “*IDN?” remote control
command.
3.1.3. Instrument Execution Button for download of trace
data
With this button you can execute the download of the trace data from the
instrument and start the conversion calculation to Mixed Mode SParameters.
After pressing the “Download” button, the VBA Macro downloads all 4 SParameters of the currently active ZVx channel. Subsequently, the S-Matrix
is converted to Mixed Mode S-Parameters. The results (Sdd11, Sdc11,
Scd11, Scc11) will be shown in the spreadsheet by magnitude and phase
each.
If the current instrument setup contains several channels, the Excel™
Macro will use the currently active channel settings for the trace download.
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Operation of the ZVx_Balanced.xls Tool
3.1.4. Frequency List
After the successful download of the trace data, you will find the
corresponding frequency list in column A (pink color).
3.1.5. Magnitude (dB) and Phase parameter of Mixed Mode SParameter Trace Data
The Mag(dB) and phase values of the mixed mode S-Parameters of S11
can be found in columns B to I (yellow color).
This data is actually not directly downloaded from the instrument, but it is
calculated within Excel™ VBA from the normal (single-ended) SParameters.
3.2. Graphical Result View in Excel™
With the graphical functions inside MS Excel™ , it is possible to display the
downloaded trace data as a diagram.
An example is shown in ZVx_Balanced.xls in the four diagram pages
“Sdd11”, “Sdc11”, “Scd11”, “Scc11”.
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Operation of the ZVx_Balanced.xls Tool
3.2.1. Example: View for Sdd11
The display shows two traces: One for magnitude (blue), the other for
phase (red). The corresponding Y-axes can be found on the left side
(magnitude) and right side (phase).
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Hardware and Software Requirements
4. Hardware and Software Requirements
4.1. PC Hardware Requirements
Minimum
Recommended
CPU
Pentium 133 MHz
Pentium II 450 MHz or higher
RAM
32 Mbyte
128 MByte
Harddisc
10 MByte free space
50 MByte free harddisc space
Monitor
VGA monitor (640x480)
SVGA color monitor,
resolution 800x600 or better
IEEE Bus or
LAN/Ethernet
required
4.2. PC Software Requirements
Minimum
OS
Windows 95 / 98 / NT 4.0
/ 2000 / Me / XP
Recommended
Windows 98 / 2000 / Me / XP
Microsoft Internet Explorer 5.0
or above
OS
add-ons
---
IEEE Bus
Driver
Version 1.70 (or above)
Version 1.70 (or above)
VISA
VISA 4.0
VISA 4.0
RSIB
RSIB 1.0
RSIB 1.0
Microsoft Excel™2002 or
above
5. Literature
[1]
R&S Application note 1EF47, “Remote Control of R&S Spectrum
and Network Analyzers via LAN”, available at www.rohde-schwarz.com
[2]
D. E. Bockelman, W. R. Eisenstadt, “Combined Differential and
Common-Mode Scatterin Parameters: Theory and Simulation”, IEEE Trans.
on MTT, Vol. 43, No. 7, July 1995, pp. 1530-1539
6. Additional Information
This application note and the associated program are updated from time to
time. Please visit the website www.rohde-schwarz.com/appnote in order
to download new versions. Please send any comments or suggestions
about this application note to [email protected]
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Ordering information
7. Ordering information
2-port Network Analyzers
R&S® ZVL3
R&S® ZVL6
9 kHz to 3 GHz
9 kHz to 6 GHz
1303.6509.03 (2 ports)
1303.6509.06 (2 ports)
R&S® ZVA8
R&S® ZVA24
R&S® ZVA40
R&S® ZVA50
300 kHz to 8 GHz
10 MHz to 24 GHz
10 MHz to 40 GHz
10 MHz to 40 GHz
1145.1110.08 (2 ports)
1145.1110.24 (2 ports)
1145.1110.40 (2 ports)
1145.1110.50 (2 ports)
R&S® ZVB4
R&S® ZVB8
R&S® ZVB14
R&S® ZVB20
300 kHz to 4 GHz
300 kHz to 8 GHz
10MHz to 14 GHz
10 MHz to 20 GHz
1145.1010.04 (2 ports)
1145.1010.08 (2 ports)
1145.1010.14 (2 ports)
1145.1010.20 (2 ports)
R&S® ZVT8
300 kHz to 8 GHz
1300.0000.08
(2 ports to 8 ports)
Apart from the 2-port Network analyzers listed above, also multiport
Network analyzer with 3, 4 ports (ZVB, ZVA) as well as 8-ports (ZVT) are
available from Rohde & Schwarz.
Please note, that complete solutions for signal generation and signal
analysis for various applications are available from Rohde & Schwarz.
For additional information about equipment, see the Rohde & Schwarz
website www.rohde-schwarz.com.
ROHDE & SCHWARZ GmbH & Co. KG . Mühldorfstraße 15 . D-81671 München . Postfach 80 14 69 . D-81614 München .
Tel (089) 4129 -0 . Fax (089) 4129 - 13777 . Internet: http://www.rohde-schwarz.com
This application note and the supplied programs may only be used subject to the conditions of use set forth in the
download area of the Rohde & Schwarz website.
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