R&S®FSMR3-K50
Spurious Measurements
User Manual
(;ÝÅ_2)
1179554702
Version 01
This document describes the following R&S®FSMR3000 models:
●
R&S®FSMR3008 (1345.4004K08)
●
R&S®FSMR3026 (1345.4004K26)
●
R&S®FSMR3050 (1345.4004K50)
The contents of this manual correspond to firmware version 1.10 and higher.
The following firmware options are described:
●
R&S FSMR3-K50 (1345.3966.02)
© 2022 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Muenchen, Germany
Phone: +49 89 41 29 - 0
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1179.5547.02 | Version 01 | R&S®FSMR3-K50
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol , e.g. R&S®FSMR3 is indicated as
R&S FSMR3.
R&S®FSMR3-K50
1 Preface.................................................................................................... 7
1.1 About this manual.........................................................................................................7
1.2 Conventions used in the documentation....................................................................8
1.2.1 Typographical conventions..............................................................................................8
1.2.2 Conventions for procedure descriptions..........................................................................8
1.2.3 Notes on screenshots..................................................................................................... 8
2 Welcome to the R&S FSMR3000 spurious measurements applica-
2.1 Starting the R&S FSMR3000 spurious measurements application..........................9
2.2 Understanding the display information.................................................................... 10
Contents
Contents
tion...........................................................................................................9
3 Measurement basics............................................................................13
3.1 Spurious emissions.................................................................................................... 13
3.2 Frequency plan and spur identification.................................................................... 13
3.3 Measurement process................................................................................................ 14
4 Measurement types and results......................................................... 16
4.1 Evaluation methods.................................................................................................... 16
5 Configuration........................................................................................21
5.1 Configuration overview.............................................................................................. 21
5.2 Input settings...............................................................................................................23
5.2.1 Input source settings..................................................................................................... 23
5.2.1.1 Radio frequency input................................................................................................... 23
5.3 Trigger settings........................................................................................................... 26
5.4 Measurement settings................................................................................................ 30
5.5 Carrier reference settings.......................................................................................... 33
5.6 Wide Search Measurement settings..........................................................................36
5.6.1 Managing ranges.......................................................................................................... 37
5.6.2 Configuring individual ranges........................................................................................39
5.7 Identification settings - DUT frequency plan............................................................42
5.8 Transferring settings between measurements.........................................................46
5.8.1 Segment table............................................................................................................... 46
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5.8.2 Spur table......................................................................................................................47
5.9 Directed Search Measurement settings....................................................................48
5.9.1 Managing spans............................................................................................................49
5.9.2 Configuring spur search spans..................................................................................... 53
5.10 Display configuration................................................................................................. 55
5.11 Result configuration................................................................................................... 55
5.11.1 Spurious detection table configuration.......................................................................... 55
5.11.2 Results settings.............................................................................................................56
5.12 Sweep settings............................................................................................................ 58
5.13 Adjusting settings automatically...............................................................................58
6 Analysis................................................................................................ 60
6.1 Y-Scaling......................................................................................................................60
Contents
6.2 Trace settings..............................................................................................................62
6.3 Trace / table export configuration............................................................................. 62
6.4 Markers........................................................................................................................ 64
6.4.1 Individual marker settings............................................................................................. 64
6.4.2 General marker settings................................................................................................68
6.4.3 Marker search settings and positioning functions......................................................... 69
6.4.3.1 Marker search settings..................................................................................................69
6.4.3.2 Positioning functions..................................................................................................... 70
6.5 Display line settings................................................................................................... 72
7 How to perform Spurious measurements..........................................73
7.1 How to perform a Wide Search Measurement..........................................................73
7.2 How to perform a Directed Search Measurement.................................................... 74
7.3 How to perform a combined Wide Search Measurement and Directed Search
Measurement............................................................................................................... 75
7.4 How to perform a spurious search measurement with a DUT frequency plan..... 76
8 Remote commands to perform Spurious measurements................ 78
8.1 Introduction................................................................................................................. 79
8.1.1 Conventions used in descriptions................................................................................. 79
8.1.2 Long and short form...................................................................................................... 80
8.1.3 Numeric suffixes............................................................................................................80
8.1.4 Optional keywords.........................................................................................................80
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8.1.5 Alternative keywords..................................................................................................... 81
8.1.6 SCPI parameters...........................................................................................................81
8.1.6.1 Numeric values............................................................................................................. 81
8.1.6.2 Boolean......................................................................................................................... 82
8.1.6.3 Character data.............................................................................................................. 83
8.1.6.4 Character strings...........................................................................................................83
8.1.6.5 Block data..................................................................................................................... 83
8.2 Activating Spurious measurements..........................................................................83
8.3 Configuring Spurious measurements.......................................................................86
8.3.1 Configuring the data input............................................................................................. 87
8.3.1.1 RF input.........................................................................................................................87
8.3.1.2 Working with power sensors......................................................................................... 90
Contents
Configuring power sensors........................................................................................... 90
Configuring power sensor measurements.................................................................... 92
Triggering with power sensors...................................................................................... 98
8.3.2 Configuring triggered measurements..........................................................................100
8.3.2.1 Configuring the triggering conditions...........................................................................100
8.3.2.2 Configuring the trigger output......................................................................................104
8.3.3 Measurement control commands................................................................................106
8.3.4 Carrier reference level commands.............................................................................. 108
8.3.5 Wide Search Measurement settings commands.........................................................112
8.3.6 Frequency plan identification commands.................................................................... 119
8.3.7 Directed Search Measurement settings commands................................................... 123
8.3.8 Transferring settings between measurements............................................................ 128
8.3.9 Configuring the result displays.................................................................................... 129
8.3.9.1 General window commands........................................................................................129
8.3.9.2 Working with windows in the display...........................................................................130
8.3.9.3 Configuring tables and diagrams................................................................................ 136
8.4 Performing measurements.......................................................................................137
8.5 Analyzing Spurious measurements........................................................................ 139
8.5.1 Configuring the Y-Axis scaling.....................................................................................139
8.5.2 Setting up individual markers...................................................................................... 141
8.5.3 General marker settings..............................................................................................148
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8.5.4 Configuring and performing a marker search..............................................................149
8.5.5 Positioning the marker................................................................................................ 152
8.5.5.1 Positioning normal markers.........................................................................................152
8.5.5.2 Positioning delta markers............................................................................................154
8.5.6 Configuring traces....................................................................................................... 156
8.5.7 Configuring display lines............................................................................................. 157
8.6 Retrieving results......................................................................................................159
8.6.1 Retrieving and storing trace data................................................................................ 160
8.6.2 Checking the results of a limit check...........................................................................161
8.6.3 Exporting table and trace results to an ASCII file........................................................162
8.6.4 Retrieving marker results............................................................................................ 165
8.7 Status reporting system........................................................................................... 167
8.8 Programming examples: spurious emissions measurements............................. 167
Contents
8.8.1 Performing a wide search measurement.................................................................... 167
8.8.2 Performing a directed search measurement............................................................... 170
8.8.3 Performing a spurious search measurement using a frequency plan......................... 171
Annex.................................................................................................. 174
A Reference: ASCII file export format..................................................174
List of Commands (Spurious)...........................................................176
Index....................................................................................................181
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1 Preface
1.1 About this manual
Preface
About this manual
This Spurious Measurements User Manual provides all the information specific to the
application. All general instrument functions and settings common to all applications
and operating modes are described in the main R&S FSMR3 User Manual.
The main focus in this manual is on the measurement results and the tasks required to
obtain them. The following topics are included:
●
Welcome to the R&S FSMR3000 spurious measurements application
Introduction to and getting familiar with the application
●
About the measurement
General concept of the Spurious measurement and typical applications
●
Measurements and Result Displays
Details on supported measurements and their result types
●
Measurement Basics
Background information on basic terms and principles in the context of the measurement
●
Configuration + Analysis
A concise description of all functions and settings available to configure measurements and analyze results with their corresponding remote control command
●
How to Perform Measurements in the R&S FSMR3000 spurious measurements application
Step-by-step instructions to perform a basic Spurious measurement
●
Measurement Examples
Detailed measurement examples to guide you through typical measurement scenarios and allow you to try out the application immediately
●
Optimizing and Troubleshooting the Measurement
Hints and tips on how to handle errors and optimize the test setup
●
Remote Commands for Spurious Measurements
Remote commands required to configure and perform Spurious measurements in a
remote environment, sorted by tasks
(Commands required to set up the environment or to perform common tasks on the
instrument are provided in the main R&S FSMR3 User Manual)
Programming examples demonstrate the use of many commands and can usually
be executed directly for test purposes
●
Annex
Reference material
●
List of remote commands
Alphabetical list of all remote commands described in the manual
●
Index
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1.2 Conventions used in the documentation
1.2.1 Typographical conventions
Preface
Conventions used in the documentation
The following text markers are used throughout this documentation:
Convention Description
"Graphical user interface elements"
[Keys] Key and knob names are enclosed by square brackets.
Filenames, commands,
program code
Input Input to be entered by the user is displayed in italics.
Links Links that you can click are displayed in blue font.
"References" References to other parts of the documentation are enclosed by quota-
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
Filenames, commands, coding samples and screen output are distinguished by their font.
tion marks.
1.2.2 Conventions for procedure descriptions
When operating the instrument, several alternative methods may be available to perform the same task. In this case, the procedure using the touchscreen is described.
Any elements that can be activated by touching can also be clicked using an additionally connected mouse. The alternative procedure using the keys on the instrument or
the on-screen keyboard is only described if it deviates from the standard operating procedures.
The term "select" may refer to any of the described methods, i.e. using a finger on the
touchscreen, a mouse pointer in the display, or a key on the instrument or on a keyboard.
1.2.3 Notes on screenshots
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as many as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
The screenshots usually show a fully equipped product, that is: with all options installed. Thus, some functions shown in the screenshots may not be available in your particular product configuration.
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Welcome to the R&S FSMR3000 spurious measurements application
Starting the R&S
FSMR3000 spurious measurements application
2 Welcome to the R&S FSMR3000 spurious
measurements application
The R&S FSMR3-K50 is a firmware application that allows you to perform Spurious
measurements on the R&S FSMR3 very quickly and easily.
As an addition to the basic Spurious measurements available in the R&S FSMR3 base
unit, the R&S FSMR3000 spurious measurements application features:
●
Very quick spurious measurements on predefined measurement ranges using optimized RBWs
●
Simple configuration of spurious measurements
●
Storage of user-defined measurement configurations
●
Measurement of both the power and the frequency of detected spurs
●
Analysis methods to determine spurs generated internally by the spectrum analyzer itself, and to eliminate these effects
Availability of the Spurious measurement application
Using the Spurious measurement application requires the optional Spectrum Analyzer
hardware (R&S FSMR3-B1).
This user manual contains a description of the functionality that the application provides, including remote control operation.
All functions not discussed in this manual are the same as in the base unit and are
described in the R&S FSMR3 User Manual. The latest version is available for download at the product homepage.
Installation
You can find detailed installation instructions in the "R&S FSMR3 Getting Started"
manual or in the release notes.
2.1 Starting the R&S FSMR3000 spurious measurements
application
The R&S FSMR3000 spurious measurements application adds a new application to
the R&S FSMR3.
To activate the R&S FSMR3000 spurious measurements application
1. Press the [MODE] key on the front panel of the R&S FSMR3.
A dialog box opens that contains all operating modes and applications currently
available on your R&S FSMR3.
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Welcome to the R&S FSMR3000 spurious measurements application
Understanding the display information
2. Select the "Fast Spur Search" item.
The R&S FSMR3 opens a new measurement channel for the R&S FSMR3000 spurious measurements application.
The measurement is started immediately with the default settings. It can be configured
in the Spurious "Overview" dialog box, which is displayed when you select the "Overview" softkey from any menu (see Chapter 5.1, "Configuration overview",
on page 21).
Multiple Measurement Channels and Sequencer Function
When you activate an application, a new measurement channel is created which determines the measurement settings for that application. The same application can be activated with different measurement settings by creating several channels for the same
application.
The number of channels that can be configured at the same time depends on the available memory on the instrument.
Only one measurement can be performed at any time, namely the one in the currently
active channel. However, a Sequencer function is provided that allows you to perform
the configured measurements consecutively.
If activated, the measurements configured in the currently active channels are performed one after the other in the order of the tabs. The currently active measurement is
indicated by a
are updated in the tabs (including the "MultiView") as the measurements are performed. Sequential operation itself is independent of the currently displayed tab.
For details on the Sequencer function, see the R&S FSMR3 User Manual.
symbol in the tab label. The result displays of the individual channels
2.2 Understanding the display information
The following figure shows a measurement diagram during analyzer operation. All different information areas are labeled. They are explained in more detail in the following
sections.
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Welcome to the R&S FSMR3000 spurious measurements application
Understanding the display information
1
6
5
1 = Channel bar for firmware and measurement settings
2+3 = Window title bar with diagram-specific (trace) information
4 = Diagram area with spur detection threshold and limit offset lines
5 = Diagram footer with diagram-specific information, depending on measurement application
6 = Instrument status bar with error messages, progress bar and date/time display
4
Channel bar information
In the R&S FSMR3000 spurious measurements application, the R&S FSMR3 shows
the following settings:
2
3
Table 2-1: Information displayed in the channel bar in the R&S
application
"Ref Level" Reference level
"Spur Search" Measurement type ("Wide", "Direct")
"RBW" Currently used RBW during measurement
"Freq" Currently processed center frequency during measurement
"SGL" The measurement is set to single mode
"Meas Time" A minimum estimate for the required measurement time; available after
Spectral Overview is finished
Note that the estimate includes a spurious detection sweep and spot
search, assuming 10 spur candidates are found in the spurious detection
sweep. If the signal to be measured does not meet the assumptions, the
estimated measurement time may be too low.
FSMR3000 spurious measurements
The channel bar also displays information on instrument settings that affect the measurement results even though this is not immediately apparent from the display of the
measured values (e.g. transducer or trigger settings). This information is displayed only
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Welcome to the R&S FSMR3000 spurious measurements application
Understanding the display information
when applicable for the current measurement. For details, see the R&S FSMR3 Getting Started manual.
Window title bar information
For each diagram, the header provides the following information:
1 2 3 4 5
Figure 2-1: Window title bar information in the R&S FSMR3000 spurious measurements application
1 = Window number
2 = Window type
3 = Trace color
4 = Trace number
5 = Trace mode
Diagram footer information
The diagram footer (beneath the diagram) contains the following information:
●
Start and stop frequency
●
Number of trace points
●
Range per division (x-axis)
Status bar information
Global instrument settings, the instrument status and any irregularities are indicated in
the status bar beneath the diagram. Furthermore, the progress of the current measurement is displayed in the status bar. For details on the measurement process, see
Chapter 3.3, "Measurement process", on page 14.
Depending on the currently running measurement (step), the following information is
indicated in the status bar:
●
Which measurement step is being performed
●
The total number of segments required to meet the user specification and the segment currently being processed
●
The total number of data acquisitions required to meet the user specification and
the acquisition currently being processed
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3 Measurement basics
3.1 Spurious emissions
Measurement basics
Frequency plan and spur identification
Some background knowledge on basic terms and principles used in Spurious measurements is provided here for a better understanding of the required configuration settings.
● Spurious emissions.................................................................................................13
● Frequency plan and spur identification................................................................... 13
● Measurement process.............................................................................................14
Spurious emissions can be generated by a variety of processes, including:
●
Instability, parasitic oscillations and resonances
●
Harmonics
●
Interference: RF leakage, EMI ingress from digital clocks
●
Modulation: Intermodulation (IM) and cross-modulation (CM) effects
●
Spurs internally generated by the test equipment (spectrum analyzer)
These spurious emissions can cause problems for the equipment manufacturer including:
●
Interference with radio transmissions in adjacent bands
●
Interference with other modules contained within the equipment
●
Violation of regulatory limits
●
Power inefficiencies due to the transmissions of non-usable frequencies
Thus, the R&S FSMR3000 spurious measurements application allows you to detect,
measure and identify spurious signals, based on common spectrum analyzer functionality.
Residuals
Residuals are spurs that are created by the analyzer itself. These spurs are identified
by the R&S FSMR3000 spurious measurements application automatically, and can be
displayed or removed from the measured results.
3.2 Frequency plan and spur identification
You can define the main components in the signal chain of your DUT with the corresponding frequencies in a frequency plan. Then the R&S FSMR3000 spurious measurements application can calculate the frequencies for possible spurs at those frequencies and the frequencies of mixer products up to a maximum number of harmonics. After a measurement, the R&S FSMR3000 spurious measurements application
compares the detected spurious results to the predicted frequencies. Spurs that occur
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3.3 Measurement process
Measurement basics
Measurement process
at one of the predicted frequencies are identified. Thus, you get an idea of the possible
source of the spurs.
Note that if several combinations of components, input frequencies and harmonics lead
to the same predicted spur frequency, the spur identification with the lowest harmonic
is indicated. If the frequency is still not unique, the identification with the shortest string
length is indicated.
If you transfer the predicted frequencies from a frequency plan to a directed search
measurement, the measurement is only performed at the frequencies specified in the
plan.
For details on how to perform a measurement using a frequency plan, see Chapter 7.4,
"How to perform a spurious search measurement with a DUT frequency plan",
on page 76.
The R&S FSMR3000 spurious measurements application provides two different measurement types (see also Chapter 4, "Measurement types and results", on page 16):
●
A measurement on a wide frequency range (wide search measurement), intended
for unknown spurious scenarios.
●
A detailed measurement (directed search measurement) at specific frequencies
with a small span around each frequency.
Although the two measurement types use different measurement settings, the individual measurement steps are the same for both types.
The basic measurement process consists of the following steps:
1. Spectral overview: An initial sweep from the beginning of the first defined range to
the end of the last defined range (for directed search measurement: from the first
to the last span), using a large RBW and short sweep time to obtain an overview of
the input signal quickly.
The spectral overview allows the R&S FSMR3000 spurious measurements application to estimate the noise floor for the current user settings for the complete frequency span defined by the ranges or directed search measurements.
Note: If the signal contains a guard interval, you can restrict the spur search to
ignore a certain span around the carrier. In this case, the spectral overview contains gaps at the specified spans.
2. Noise floor estimation: Estimation of the noise floor from the beginning of the first
defined range to the end of the last defined range (for directed search measurement: from the first to the last span), determined from the spectral overview sweep.
The noise floor estimate is required to set the RBW optimally for subsequent measurement steps: Due to noise variations across the frequencies, the RBW required
to achieve the user-defined spur detection threshold varies. Each range is thus
split into smaller segments that use a constant RBW setting for the complete segment span. The frequency span of the segments depends on the signal and noise
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Measurement basics
Measurement process
conditions and on the settings. As a result, a segment table is created. This table
can be analyzed and used for repeated measurements with the same settings (see
Chapter 5.8, "Transferring settings between measurements", on page 46).
3. Spurious detection: A second sweep performed in the predefined ranges/
segments/spans according to the wide search measurement/directed search measurement configuration. The RBW determined by the noise floor estimate or, for
manual RBW configuration, the user-defined RBW is used. Depending on the size
of the range/span and the required RBW, multiple data acquisitions (or more precisely: FFTs) may be required.
Within the defined and swept ranges/spans, the noise floor is displayed below the
user-defined spur detection threshold. Outside the ranges/spans, no trace is available.
Measured power values that exceed the detection threshold are possible spurs and
are entered in the "Spurious Detection Table".
4. Spot Search: A final sweep on each of the possible spurs in the "Spurious Detec-
tion Table" to determine whether the peak is a real spur, an artifact of noise, or generated internally. The RBW for these spot searches may be reduced further compared to the spurious detection sweep: It is set such that the final spur has at least
the user-defined minimum SNR (see "Minimum Spur SNR" on page 54).
The lower RBW leads to a lower noise floor for this scan region compared to the
surrounding regions. Thus, a message indicating the possibility of lower noise
floors is displayed during the spot search (see "Show Messages" on page 57).
Spurs that are found to be artifacts of noise or residuals during the spot search are
removed from the "Spurious Detection Table". (Alternatively, residuals can be
marked instead of removed).
After the spot search, the "Spurious Detection Table" contains all peaks that still
exceed the detection threshold, and are considered a spur. All spurs that exceed
the limit line are marked red (see "Limit Offset to Detection Threshold"
on page 51). The spur frequency and level are updated with more accurate values during the spot search.
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4 Measurement types and results
Measurement types and results
Evaluation methods
Access: "Overview" > "Measurement Control"
Or: [MEAS CONFIG] > "Measurement Control"
There are two different Spurious measurement types for common measurement scenarios, which require different settings.
Wide Search Measurement
A wide search measurement is a measurement with a large span to detect any possible spurs in the entire frequency span of an input signal. This measurement is useful if
you have little or no knowledge of the current input signal or where to expect spurs,
and require an overview.
Directed Search Measurement
A directed search measurement is a measurement performed at predefined discrete
frequencies with settings optimized for the current signal and noise levels at those frequencies. This measurement is targeted at determining the precise level and exact frequency of spurs that are basically known or expected.
The results of both measurements on the same signal are basically the same; however, the directed search measurement can save measurement time if the frequencies
for possible spurs are known in advance. Furthermore, the directed search measurement can provide more precise results, using a larger SNR for a smaller span.
Combined Wide Search Measurement and Directed Search Measurement
Both types of measurement can be combined, if only some of the spurs found during
the wide search measurement are to be analyzed further:
1. Perform a wide search measurement to obtain an overview and detect the spurs in
a large frequency span.
2. Transfer the frequencies of interest to the directed search measurement configura-
tion.
3. Perform a directed search measurement at the frequencies of interest only in a
second measurement.
4.1 Evaluation methods
Access: "Overview" > "Display Config"
Or: [MEAS]
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Measurement types and results
Evaluation methods
The data that was measured by the R&S FSMR3000 spurious measurements application can be evaluated using various different methods. All evaluation methods available
for the Spurious measurements are displayed in the selection bar in SmartGrid mode.
For details on working with the SmartGrid, see the R&S FSMR3 Getting Started manual.
By default, the following result displays are provided for Spurious measurements:
●
"Spectral Overview" on page 17
●
"Spurious Detection Spectrum" on page 18
●
"Spurious Detection Table" on page 19
Spectral Overview.........................................................................................................17
Spurious Detection Spectrum....................................................................................... 18
Spurious Detection Table.............................................................................................. 19
Noise Floor Estimate.....................................................................................................20
Marker Table................................................................................................................. 20
Spectral Overview
Displays a spectrum diagram of the "Spectral Overview" (see Chapter 3.3, "Measure-
ment process", on page 14), meant to obtain an overview of the input signal and the
required measurement settings. A continuous trace is shown for the entire measurement span.
The specified detection threshold for each range/span is indicated by a blue line in the
diagram (only if it is within the displayed power region, see "Detection Threshold"
on page 54).
Note: If the signal contains a guard interval, you can restrict the spur search to ignore
a certain span around the carrier. In this case, the spectral overview contains gaps at
the specified spans.
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Measurement types and results
Evaluation methods
Remote command:
LAY:ADD? '1',RIGH,SOVerview, see LAYout:ADD[:WINDow]? on page 130
Storing results:
MMEMory:STORe<n>:TRACe on page 165
Spurious Detection Spectrum
Displays the results of the spurious detection sweep (see Chapter 3.3, "Measurement
process", on page 14) as a spectrum diagram for the (discrete) swept ranges. For
ranges that include gaps and for directed search measurements, the diagram shows
several separate trace parts, one for each measured frequency range or span.
The specified detection threshold for each range/span is indicated by a blue line in the
diagram (see "Detection Threshold" on page 54).
The limit line defined as an offset to the detection threshold is indicated by a red line in
the diagram (see "Limit Offset to Detection Threshold" on page 51).
Colored bars beneath the diagram indicate the specified measurement ranges (see
Chapter 3.3, "Measurement process", on page 14).
(Both lines and the colored bars can be hidden, see Chapter 5.11.2, "Results settings",
on page 56.)
The result of the overall limit check for the entire measurement is indicated at the top of
the diagram. If any spurs exceed the defined limit line for the corresponding range or
span, the limit check is failed.
Remote command:
LAY:ADD? '1',RIGH,SDETection, see LAYout:ADD[:WINDow]? on page 130
Storing results:
MMEMory:STORe<n>:TRACe on page 165
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Measurement types and results
Evaluation methods
Spurious Detection Table
Displays the numerical results of the detected spurs. Optionally, residual spurs are indicated in light gray (see "Mark Residual Spurs" on page 32). Spurs that exceed the
defined limit are indicated in red (see "Limit Offset to Detection Threshold"
on page 51).
During the measurement process (see Chapter 3.3, "Measurement process",
on page 14), the values are updated and refined. The spurs are listed in the order they
are detected, that is: in ascending order of frequency. Each spur ID is indicated in the
same color as the range it was found in (see also "Spurious Detection Spectrum"
on page 18).
If identification according to the DUT's frequency plan is activated and possible, the
detected spurs' identification is also displayed. Note that if several combinations of
components, input frequencies and harmonics lead to the same predicted spur frequency, the spur identification with the lowest harmonic is indicated. If the frequency is
still not unique, the identification with the shortest value is indicated.
Note: You can configure which results to display in the table in order to use the available display space optimally or reduce the time to store the results (see Chapter 5.11.1,
"Spurious detection table configuration", on page 55).
Table 4-1: Spurious Detection Table Results
Column Description
"Frequency" The frequency of the spur
"Power" The power level measured at the spur
"Delta to Limit" The difference between the measured power and the defined limit value
"RBW" The RBW that was used in that range
"Segment
Start" / "Segment Stop"
"Spur ID" Consecutive number of spur in the order it was found; indicated in same color as the
"Identification" Identified spur from the frequency plan, if available
The start and stop frequency of the segment in which the spur was found;
(For measurements without optimization, the values correspond to the range frequen-
cies.)
range it was found in
Remote command:
LAY:ADD? '1',RIGH,SDTable, see LAYout:ADD[:WINDow]? on page 130
Storing results:
MMEMory:STORe<n>:TABLe on page 164
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Measurement types and results
Evaluation methods
Noise Floor Estimate
Displays the noise floor estimated during the "Spectral Overview". This information
helps you understand the RBWs used for the individual segments by the
R&S FSMR3000 spurious measurements application.
Remote command:
LAY:ADD? '1',RIGH,NESTimate, see LAYout:ADD[:WINDow]? on page 130
Storing results:
MMEMory:STORe<n>:TRACe on page 165
Marker Table
Displays a table with the current marker values for the active markers.
This table is displayed automatically if configured accordingly.
Tip: To navigate within long marker tables, simply scroll through the entries with your
finger on the touchscreen.
Remote command:
LAY:ADD? '1',RIGH, MTAB, see LAYout:ADD[:WINDow]? on page 130
Results:
CALCulate<n>:MARKer<m>:X on page 147
CALCulate<n>:MARKer<m>:Y? on page 166
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5 Configuration
Configuration
Configuration overview
Access: [MODE] > "Spurious"
Spurious measurements require a special application on the R&S FSMR3.
When you switch a measurement channel to the R&S FSMR3000 spurious measurements application the first time, a set of parameters is passed on from the currently
active application. After initial setup, the parameters for the measurement channel are
stored upon exiting and restored upon re-entering the channel. Thus, you can switch
between applications quickly and easily.
When you activate a measurement channel in the R&S FSMR3000 spurious measurements application, the "Spurious" menu is displayed and provides access to the most
important configuration functions.
● Configuration overview............................................................................................21
● Input settings...........................................................................................................23
● Trigger settings....................................................................................................... 26
● Measurement settings.............................................................................................30
● Carrier reference settings........................................................................................33
● Wide Search Measurement settings....................................................................... 36
● Identification settings - DUT frequency plan........................................................... 42
● Transferring settings between measurements........................................................46
● Directed Search Measurement settings..................................................................48
● Display configuration...............................................................................................55
● Result configuration................................................................................................ 55
● Sweep settings........................................................................................................58
● Adjusting settings automatically..............................................................................58
5.1 Configuration overview
Access: all menus
Throughout the measurement channel configuration, an overview of the most important
currently defined settings is provided in the "Overview".
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Configuration
Configuration overview
In addition to the main measurement settings, the "Overview" provides quick access to
the main settings dialog boxes. The individual configuration steps are displayed in the
order of the data flow. Thus, you can easily configure an entire measurement channel
from input over processing to output by stepping through the dialog boxes as indicated
in the "Overview".
Depending on the measurement currently selected in the Measurement settings settings, the required steps in the overview differ slightly.
In particular, the "Overview" provides quick access to the following configuration dialog
boxes:
1. Input/ Output/Trigger
See Chapter 5.2, "Input settings", on page 23
2. Carrier Reference Settings
See Chapter 5.5, "Carrier reference settings", on page 33
3. Measurement Settings
See Chapter 5.4, "Measurement settings", on page 30
4. Wide Search Settings
See Chapter 5.6, "Wide Search Measurement settings", on page 36
5. Frequency Plan
See Chapter 5.7, "Identification settings - DUT frequency plan", on page 42
6. Transfer
See Chapter 5.8.2, "Spur table", on page 47/ Chapter 5.8.1, "Segment table",
on page 46
7. Directed Search Settings
See Chapter 5.9, "Directed Search Measurement settings", on page 48
8. Display Configuration
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Configuration
Input settings
See Chapter 5.10, "Display configuration", on page 55
To configure settings
► Select any button to open the corresponding dialog box. To configure a particular
setting displayed in the "Overview", simply select the setting on the touch screen.
The corresponding dialog box is opened with the focus on the selected setting.
For step-by-step instructions on configuring Spurious measurements, see Chapter 7,
"How to perform Spurious measurements", on page 73.
Preset Channel
Select the "Preset Channel" button in the lower left-hand corner of the "Overview" to
restore all measurement settings in the current channel to their default values.
Note: Do not confuse the "Preset Channel" button with the [Preset] key, which restores
the entire instrument to its default values and thus closes all channels on the
R&S FSMR3 (except for the default channel)!
Remote command:
SYSTem:PRESet:CHANnel[:EXEC] on page 86
5.2 Input settings
Access: "Overview" > "Input/Output/Trigger"
The R&S FSMR3 can evaluate signals from different input sources and provide various
types of output (such as noise or trigger signals).
● Input source settings...............................................................................................23
5.2.1 Input source settings
Access: "Overview" > "Input/Output/Trigger" > "Input Source"
The input source determines which data the R&S FSMR3 analyzes.
The default input source for the R&S FSMR3 is "Radio Frequency", i.e. the signal at
the "RF Input" connector of the R&S FSMR3. If no additional options are installed, this
is the only available input source.
● Radio frequency input............................................................................................. 23
5.2.1.1 Radio frequency input
Access: "Overview" > "Input/Frontend" > "Input Source" > "Radio Frequency"
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Configuration
Input settings
RF Input Protection
The RF input connector of the R&S FSMR3 must be protected against signal levels
that exceed the ranges specified in the data sheet. Therefore, the R&S FSMR3 is
equipped with an overload protection mechanism for DC and signal frequencies up to
30 MHz. This mechanism becomes active as soon as the power at the input mixer
exceeds the specified limit. It ensures that the connection between RF input and input
mixer is cut off.
When the overload protection is activated, an error message is displayed in the status
bar ("INPUT OVLD"), and a message box informs you that the RF input was disconnected. Furthermore, a status bit (bit 3) in the STAT:QUES:POW status register is set.
In this case, you must decrease the level at the RF input connector and then close the
message box. Then measurement is possible again. Reactivating the RF input is also
possible via the remote command INPut<ip>:ATTenuation:PROTection:RESet.
Radio Frequency State................................................................................................. 24
Input Coupling...............................................................................................................25
Impedance.................................................................................................................... 25
High Pass Filter 1 to 3 GHz...........................................................................................25
YIG-Preselector.............................................................................................................25
Radio Frequency State
Activates input from the "RF Input" connector.
Remote command:
INPut<ip>:SELect on page 90
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Configuration
Input settings
Input Coupling
The RF input of the R&S FSMR3 can be coupled by alternating current (AC) or direct
current (DC).
AC coupling blocks any DC voltage from the input signal. AC coupling is activated by
default to prevent damage to the instrument. Very low frequencies in the input signal
can be distorted.
However, some specifications require DC coupling. In this case, you must protect the
instrument from damaging DC input voltages manually. For details, refer to the data
sheet.
Remote command:
INPut<ip>:COUPling on page 88
Impedance
For some measurements, the reference impedance for the measured levels of the
R&S FSMR3000 can be set to 50 Ω or 75 Ω.
Select 75 Ω if the 50 Ω input impedance is transformed to a higher impedance using a
75 Ω adapter of the RAZ type. (That corresponds to 25Ω in series to the input impedance of the instrument.) The correction value in this case is 1.76 dB = 10 log (75Ω/
50Ω).
Remote command:
INPut<ip>:IMPedance on page 89
High Pass Filter 1 to 3 GHz
Activates an additional internal highpass filter for RF input signals from 1 GHz to
3 GHz. This filter is used to remove the harmonics of the analyzer to measure the harmonics for a DUT, for example.
This function requires an additional hardware option.
Note: For RF input signals outside the specified range, the high-pass filter has no
effect. For signals with a frequency of approximately 4 GHz upwards, the harmonics
are suppressed sufficiently by the YIG-preselector, if available.)
Remote command:
INPut<ip>:FILTer:HPASs[:STATe] on page 89
YIG-Preselector
Enables or disables the YIG-preselector, if available on the R&S FSMR3000.
The R&S FSMR3000 spurious measurements application requires the YIG-preselector
at the input of the R&S FSMR3000 to ensure that image frequencies are rejected.
However, image rejection is only possible for a restricted bandwidth.
Note: Note that the YIG-preselector is active only on frequencies greater than 8 GHz.
Therefore, switching the YIG-preselector on or off has no effect if the frequency is
below that value.
Remote command:
INPut<ip>:FILTer:YIG[:STATe] on page 89
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5.3 Trigger settings
Configuration
Trigger settings
Access: "Overview" > "Input/Output/Trigger" > "Trigger" tab
Trigger settings determine when the input signal is measured.
External triggers from one of the [TRIGGER INPUT/OUTPUT] connectors on the
R&S FSMR3 are configured in a separate tab of the dialog box.
For step-by-step instructions on configuring triggered measurements, see the main
R&S FSMR3 User Manual.
Trigger Source...............................................................................................................27
└ Trigger Source................................................................................................ 27
└ Free Run...............................................................................................27
└ Ext. Trigger 1/2..................................................................................... 27
└ IF Power............................................................................................... 27
└ Trigger Level...................................................................................................28
└ Drop-Out Time................................................................................................ 28
└ Trigger Offset..................................................................................................28
└ Hysteresis....................................................................................................... 28
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Configuration
Trigger settings
└ Trigger Holdoff................................................................................................ 29
└ Slope...............................................................................................................29
Trigger 1/2.....................................................................................................................29
└ Output Type.................................................................................................... 29
└ Level..................................................................................................... 30
└ Pulse Length.........................................................................................30
└ Send Trigger.........................................................................................30
Trigger Source
The trigger settings define the beginning of a measurement.
Trigger Source ← Trigger Source
Defines the trigger source. If a trigger source other than "Free Run" is set, "TRG" is
displayed in the channel bar and the trigger source is indicated.
Remote command:
TRIGger[:SEQuence]:SOURce on page 103
Free Run ← Trigger Source ← Trigger Source
No trigger source is considered. Data acquisition is started manually or automatically
and continues until stopped explicitly.
Remote command:
TRIG:SOUR IMM, see TRIGger[:SEQuence]:SOURce on page 103
Ext. Trigger 1/2 ← Trigger Source ← Trigger Source
Data acquisition starts when the TTL signal fed into the specified input connector
meets or exceeds the specified trigger level.
(See "Trigger Level" on page 28).
Note: The "External Trigger 1" softkey automatically selects the trigger signal from the
"Trigger Input / Output" connector on the front panel.
For details, see the "Instrument Tour" chapter in the R&S FSMR3 Getting Started man-
ual.
"External Trigger 1"
Trigger signal from the "Trigger Input / Output" connector.
(front panel)
"External Trigger 2"
Trigger signal from the "Sync Trigger Input / Output" connector.
(rear panel)
Remote command:
TRIG:SOUR EXT, TRIG:SOUR EXT2
See TRIGger[:SEQuence]:SOURce on page 103
IF Power ← Trigger Source ← Trigger Source
The R&S FSMR3 starts capturing data as soon as the trigger level is exceeded around
the third intermediate frequency.
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Configuration
Trigger settings
For frequency sweeps, the third IF represents the start frequency. The trigger threshold
depends on the defined trigger level, as well as on the RF attenuation and preamplification. A reference level offset, if defined, is also considered. The trigger bandwidth at
the intermediate frequency depends on the RBW and sweep type. For details on available trigger levels and trigger bandwidths, see the instrument data sheet.
For measurements on a fixed frequency (e.g. zero span or I/Q measurements), the
third IF represents the center frequency.
This trigger source is only available for RF input.
The available trigger levels depend on the RF attenuation and preamplification. A refer-
ence level offset, if defined, is also considered.
For details on available trigger levels and trigger bandwidths, see the data sheet.
Remote command:
TRIG:SOUR IFP, see TRIGger[:SEQuence]:SOURce on page 103
Trigger Level ← Trigger Source
Defines the trigger level for the specified trigger source.
For details on supported trigger levels, see the instrument data sheet.
Remote command:
TRIGger[:SEQuence]:LEVel[:EXTernal<port>] on page 102
Drop-Out Time ← Trigger Source
Defines the time that the input signal must stay below the trigger level before triggering
again.
Remote command:
TRIGger[:SEQuence]:DTIMe on page 101
Trigger Offset ← Trigger Source
Defines the time offset between the trigger event and the start of the measurement.
Offset > 0: Start of the measurement is delayed
Offset < 0: Measurement starts earlier (pretrigger)
Remote command:
TRIGger[:SEQuence]:HOLDoff[:TIME] on page 101
Hysteresis ← Trigger Source
Defines the distance in dB to the trigger level that the trigger source must exceed
before a trigger event occurs. Setting a hysteresis avoids unwanted trigger events
caused by noise oscillation around the trigger level.
This setting is only available for "IF Power" trigger sources. The range of the value is
between 3 dB and 50 dB with a step width of 1 dB.
Remote command:
TRIGger[:SEQuence]:IFPower:HYSTeresis on page 101
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Configuration
Trigger settings
Trigger Holdoff ← Trigger Source
Defines the minimum time (in seconds) that must pass between two trigger events.
Trigger events that occur during the holdoff time are ignored.
Remote command:
TRIGger[:SEQuence]:IFPower:HOLDoff on page 101
Slope ← Trigger Source
For all trigger sources except time, you can define whether triggering occurs when the
signal rises to the trigger level or falls down to it.
Remote command:
TRIGger[:SEQuence]:SLOPe on page 103
Trigger 1/2
The trigger input and output functionality depends on how the variable "Trigger Input/
Output" connectors are used.
"Trigger 1"
"Trigger 2"
"Input"
"Output"
Remote command:
OUTPut<up>:TRIGger<tp>:DIRection on page 104
Output Type ← Trigger 1/2
Type of signal to be sent to the output
"Trigger 1": "Trigger Input/Output" connector on the front panel
Defines the usage of the variable "Trigger Input/Output" connector on
the rear panel.
The signal at the connector is used as an external trigger source by
the R&S FSMR3000. Trigger input parameters are available in the
"Trigger" dialog box.
The R&S FSMR3000 sends a trigger signal to the output connector to
be used by connected devices.
Further trigger parameters are available for the connector.
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Configuration
Measurement settings
"Device Triggered"
"Trigger
Armed"
"User Defined"
Remote command:
OUTPut<up>:TRIGger<tp>:OTYPe on page 105
Level ← Output Type ← Trigger 1/2
Defines whether a high (1) or low (0) constant signal is sent to the trigger output connector (for "Output Type": "User Defined".
The trigger pulse level is always opposite to the constant signal level defined here. For
example, for "Level" = "High", a constant high signal is output to the connector until you
select the Send Trigger function. Then, a low pulse is provided.
(Default) Sends a trigger when the R&S FSMR3000 triggers.
Sends a (high level) trigger when the R&S FSMR3000 is in "Ready
for trigger" state.
This state is indicated by a status bit in the STATus:OPERation register (bit 5), as well as by a low-level signal at the "AUX" port (pin 9).
Sends a trigger when you select the "Send Trigger" button.
In this case, further parameters are available for the output signal.
Remote command:
OUTPut<up>:TRIGger<tp>:LEVel on page 104
Pulse Length ← Output Type ← Trigger 1/2
Defines the duration of the pulse (pulse width) sent as a trigger to the output connector.
Remote command:
OUTPut<up>:TRIGger<tp>:PULSe:LENGth on page 105
Send Trigger ← Output Type ← Trigger 1/2
Sends a user-defined trigger to the output connector immediately.
Note that the trigger pulse level is always opposite to the constant signal level defined
by the output Level setting. For example, for "Level" = "High", a constant high signal is
output to the connector until you select the "Send Trigger" function. Then, a low pulse
is sent.
Which pulse level is sent is indicated by a graphic on the button.
Remote command:
OUTPut<up>:TRIGger<tp>:PULSe:IMMediate on page 105
5.4 Measurement settings
Access: "Overview" > "Measurement Settings"
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