Page 1
R&S®FSMR3-K50
Spurious Measurements
User Manual
(;ÝÅ_2)
1179554702
Version 01
Page 2
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.
Page 3
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
3User Manual 1179.5547.02 ─ 01
Page 4
R&S®FSMR3-K50
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
4User Manual 1179.5547.02 ─ 01
Page 5
R&S®FSMR3-K50
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
5User Manual 1179.5547.02 ─ 01
Page 6
R&S®FSMR3-K50
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
6User Manual 1179.5547.02 ─ 01
Page 7
R&S®FSMR3-K50
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
7User Manual 1179.5547.02 ─ 01
Page 8
R&S®FSMR3-K50
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.
8User Manual 1179.5547.02 ─ 01
Page 9
R&S®FSMR3-K50
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.
9User Manual 1179.5547.02 ─ 01
Page 10
R&S®FSMR3-K50
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.
10User Manual 1179.5547.02 ─ 01
Page 11
R&S®FSMR3-K50
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
11User Manual 1179.5547.02 ─ 01
Page 12
R&S®FSMR3-K50
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
12User Manual 1179.5547.02 ─ 01
Page 13
R&S®FSMR3-K50
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
13User Manual 1179.5547.02 ─ 01
Page 14
R&S®FSMR3-K50
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
14User Manual 1179.5547.02 ─ 01
Page 15
R&S®FSMR3-K50
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.
15User Manual 1179.5547.02 ─ 01
Page 16
R&S®FSMR3-K50
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]
16User Manual 1179.5547.02 ─ 01
Page 17
R&S®FSMR3-K50
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.
17User Manual 1179.5547.02 ─ 01
Page 18
R&S®FSMR3-K50
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
18User Manual 1179.5547.02 ─ 01
Page 19
R&S®FSMR3-K50
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
19User Manual 1179.5547.02 ─ 01
Page 20
R&S®FSMR3-K50
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
20User Manual 1179.5547.02 ─ 01
Page 21
R&S®FSMR3-K50
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".
21User Manual 1179.5547.02 ─ 01
Page 22
R&S®FSMR3-K50
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
22User Manual 1179.5547.02 ─ 01
Page 23
R&S®FSMR3-K50
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"
23User Manual 1179.5547.02 ─ 01
Page 24
R&S®FSMR3-K50
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
24User Manual 1179.5547.02 ─ 01
Page 25
R&S®FSMR3-K50
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
25User Manual 1179.5547.02 ─ 01
Page 26
R&S®FSMR3-K50
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
26User Manual 1179.5547.02 ─ 01
Page 27
R&S®FSMR3-K50
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.
27User Manual 1179.5547.02 ─ 01
Page 28
R&S®FSMR3-K50
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
28User Manual 1179.5547.02 ─ 01
Page 29
R&S®FSMR3-K50
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.
29User Manual 1179.5547.02 ─ 01
Page 30
R&S®FSMR3-K50
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"
30User Manual 1179.5547.02 ─ 01
Page 31
R&S®FSMR3-K50
Configuration
Measurement settings
Or: [MEAS CONFIG] > "Meas Settings"
These settings control the measurement type and the steps to be processed (see
Chapter 3.3, "Measurement process", on page 14), as well as basic measurement set-
tings.
Type of Spur Search
Use Frequency Plan for Identification........................................................................... 32
Tolerance for Identification............................................................................................ 32
Remove Residual Spurs............................................................................................... 32
Mark Residual Spurs.....................................................................................................32
Perform Measurement Step..........................................................................................33
Type of Spur Search
Defines the type of measurement to be configured and performed.
"Wide Search"
..................................................................................................... 31
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.
31User Manual 1179.5547.02 ─ 01
Page 32
R&S®FSMR3-K50
Configuration
Measurement settings
"Directed
Search"
Remote command:
[SENSe:]SSEarch:STYPe on page 107
Use Frequency Plan for Identification
If enabled, the detected spur frequencies are compared with those defined in a frequency plan for the DUT, if available (see Chapter 5.7, "Identification settings - DUT
frequency plan", on page 42 and Chapter 3.2, "Frequency plan and spur identification", on page 13). If a matching spur is identified, the spur identification is output in the
Spurious Detection Table as defined in the frequency plan.
Remote command:
[SENSe:]SSEarch:FPLan on page 106
Tolerance for Identification
Provides functionality to set the frequency tolerance. This allows matching the predicted spurs to the measured spurs.
Remote command:
[SENSe:]SSEarch:FPLan:TOLerance on page 107
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.
Remove Residual Spurs
If enabled, residual spurs, which are generated by internal components in the
R&S FSMR3 itself, are not included in the spur results. Note, however, if a residual
spur coincides with a "true" spur from the active frequency plan, the spur may also be
removed.
On the other hand, some residuals detected in the spectral overview sweep might "disappear" from the final spur results even if the "Remove Residual Spurs" setting is disabled, due to the different measurement parameters for the spectral overview sweep
and the spot search.
Remote command:
[SENSe:]SSEarch:RREMove on page 107
Mark Residual Spurs
If enabled, residual spurs are indicated in the diagrams in light gray. If a residual spur
coincides with a "true" spur from the active frequency plan, the identifier from the frequency plan spur is output using the residual color.
Note that some residuals detected in the spectral overview sweep might not be marked
in the final spur results even if the "Mark Residual Spurs" setting is enabled, due to the
different measurement parameters for the spectral overview sweep and the spot
search.
Remote command:
[SENSe:]SSEarch:RMARk on page 107
32User Manual 1179.5547.02 ─ 01
Page 33
R&S®FSMR3-K50
5.5 Carrier reference settings
Configuration
Carrier reference settings
Perform Measurement Step
Defines which steps of the measurement process are performed. All steps up to the
selected step are performed, as indicated in the dialog box. By default, all measurement steps are performed.
For details on the measurement process steps see Chapter 3.3, "Measurement proc-
ess", on page 14.
Remote command:
[SENSe:]SSEarch:CONTrol on page 106
Access: "Overview" > "Carrier Reference Settings"
The carrier, or the desired signal, is assumed to have the maximum power level in the
input signal. Thus, determining the maximum peak allows for the R&S FSMR3000 spurious measurements application to measure power values relative to the carrier.
The maximum peak, which is also the carrier reference level, can be detected automatically by the application, or defined manually by the user.
If a carrier frequency has been measured or entered by the user, additionally the harmonics and subharmonics of this carrier frequency can be identified. The harmonics
and subharmonics will be measured up to the maximum harmonics number set in this
dialog and will have a higher priority than other spurs: If a carrier harmonic has the
same frequency than a spur, the harmonic will be detected. Harmonics will be marker
in the resulting spur list and will be excluded from the limit check.
33User Manual 1179.5547.02 ─ 01
Page 34
R&S®FSMR3-K50
Configuration
Carrier reference settings
Carrier Level..................................................................................................................34
Carrier Frequency......................................................................................................... 34
Measure Carrier............................................................................................................ 35
└ Carrier Search Range.....................................................................................35
└ Start Frequency/Stop Frequency..........................................................35
└ Center Frequency/Span........................................................................35
Guard Interval............................................................................................................... 35
Spur Power Reference..................................................................................................36
Spur Frequency Reference...........................................................................................36
Identify Harmonics........................................................................................................ 36
Tolerance for Identification............................................................................................ 36
Max Harmonics Number............................................................................................... 36
Carrier Level
Defines or indicates the maximum peak of the signal, which is considered to be the reference carrier.
Remote command:
[SENSe:]CREFerence:VALue on page 111
Carrier Frequency
Defines or indicates the frequency at which the maximum peak of the signal, that is:
the reference carrier, was found.
34User Manual 1179.5547.02 ─ 01
Page 35
R&S®FSMR3-K50
Configuration
Carrier reference settings
Remote command:
[SENSe:]CREFerence:FREQuency on page 109
Measure Carrier
Automatically detects the highest peak over the specified frequency range of the analyzer. This value is considered to be the reference carrier and is indicated in Carrier
Level and Carrier Frequency.
Note: This function is identical to Auto Carrier in the "Auto Set" menu.
Remote command:
[SENSe:]ADJust:CARRier on page 108
Carrier Search Range ← Measure Carrier
Determines the search area for the Measure Carrier function.
"Full Span"
"Custom Span"
Remote command:
[SENSe:]CREFerence:SRANge on page 111
The maximum peak in the entire measurement span is determined.
The maximum peak is searched only in the range specified by Start
Frequency/Stop Frequency or Center Frequency/Span.
Start Frequency/Stop Frequency ← Carrier Search Range ← Measure Carrier
Defines the range in which the maximum peak is searched by a start and stop frequency.
This setting is only available if the Carrier Search Range is restricted ("Custom Span").
Remote command:
[SENSe:]CREFerence:PDETect:RANGe:STARt on page 110
[SENSe:]CREFerence:PDETect:RANGe:STOP on page 110
Center Frequency/Span ← Carrier Search Range ← Measure Carrier
Defines the range in which the maximum peak is searched by a center frequency and
a span.
This setting is only available if the Carrier Search Range is restricted ("Custom Span").
Remote command:
[SENSe:]CREFerence:PDETect:RANGe:CENTer on page 110
[SENSe:]CREFerence:PDETect:RANGe:SPAN on page 110
Guard Interval
Determines whether the specified guard interval is included in the spur search or not. If
the guard interval is not included, the spectrum displays contain gaps at the guard
intervals.
The guard interval is defined as a span around the reference carrier.
If the signal contains a guard interval, ignoring this interval in the spur search removes
irrelevant spurs from the results.
See also Chapter 3.3, "Measurement process", on page 14.
35User Manual 1179.5547.02 ─ 01
Page 36
R&S®FSMR3-K50
Configuration
Wide Search Measurement settings
Remote command:
[SENSe:]CREFerence:GUARd:STATe on page 109
[SENSe:]CREFerence:GUARd:INTerval on page 109
Spur Power Reference
Determines whether power values in all results and settings for the Spurious measurement are defined as absolute values (dBm) or relative to the Carrier Level power (dBc).
Remote command:
[SENSe:]CREFerence:PREFerence on page 110
Spur Frequency Reference
Determines whether frequency values in all results and settings for the Spurious measurement are defined as absolute values or relative to the Carrier Frequency frequency.
Remote command:
[SENSe:]CREFerence:FREFerence on page 109
Identify Harmonics
Switches the identification of harmonics on or off. Default condition is off. If harmonics
identification is set on, harmonics and subharmonics will be detected for the current
carrier frequency and marked in the result summary. They will be excluded from the
limit check. If harmonics identification is off, harmonics and subharmonics will be
marked as spurs.
Remote command:
[SENSe:]CREFerence:HARMonics:IDENtify on page 111
Tolerance for Identification
Provides functionality to set the tolerance for the harmonics identification. This allows
matching the predicted harmonics to the measured spurs.
Remote command:
[SENSe:]CREFerence:HARMonics:TOLerance on page 112
Max Harmonics Number
Determines which harmonics and subharmonics number shall be measured.
Remote command:
[SENSe:]CREFerence:HARMonics:MNUMber on page 111
5.6 Wide Search Measurement settings
Access: "Overview" > "Wide Search Settings"
For wide search measurement, the entire available measurement span is measured by
default. However, if you have some knowledge of the (expected) input signal and its
characteristics, you can adapt the ranges and include additional ranges to accommodate for different signal and noise levels, or exclude frequency spans which do not
require evaluation.
36User Manual 1179.5547.02 ─ 01
Page 37
R&S®FSMR3-K50
Configuration
Wide Search Measurement settings
The initial Spectral Overview sweep performs a continuous sweep from the first range
to the last, with predefined settings for a quick measurement on a wide span. The
spectral overview allows the R&S FSMR3000 spurious measurements application to
split the user-defined ranges into smaller segments with similar signal and noise characteristics.
Depending on the user-defined "Spur Detection Threshold", the RBW is set such that
the displayed noise floor is slightly below the threshold. Values that exceed the threshold are considered to be a spur and entered in the "Spurious Detection Table". Optionally, you can define a limit in relation to the threshold, against which the spur levels are
checked.
By default, the entire available measurement span is split into four frequency ranges.
However, you can change the number and size of ranges and the settings for each
individual range. Furthermore, you can save range setups to a file and load them again
later.
Each range is indicated in a different color. The same color is used to indicate the
range in the spectral result displays. In the Spurious Detection Table, the same color is
used to indicate the range in which a specific spur was found.
● Managing ranges.................................................................................................... 37
● Configuring individual ranges..................................................................................39
5.6.1 Managing ranges
Access: "Overview" > "Wide Search Settings"
The following functions allow you to manage the range setup in general.
Insert Range to the Left/ Insert Range to the Right.......................................................38
Delete Range................................................................................................................ 38
Clear Ranges................................................................................................................ 38
37User Manual 1179.5547.02 ─ 01
Page 38
R&S®FSMR3-K50
Configuration
Wide Search Measurement settings
Use Selection for All Ranges........................................................................................ 38
Save Ranges.................................................................................................................38
Load Ranges.................................................................................................................38
Setting the Reference Level Automatically (Auto Level)...............................................38
Show Segment Table.................................................................................................... 39
Insert Range to the Left/ Insert Range to the Right
Inserts a new range to the left or right of the currently focused range. The range numbers of the currently focused range and all higher ranges are increased accordingly.
The maximum number of ranges is 1000.
Remote command:
[SENSe:]LIST:RANGe<ri>:INSert on page 114
Delete Range
Deletes the currently focused range. The range numbers are updated accordingly.
Remote command:
[SENSe:]LIST:RANGe<ri>:DELete on page 114
Clear Ranges
Removes all but the first range.
Remote command:
[SENSe:]LIST:CLEar on page 113
Use Selection for All Ranges
Copies the currently selected setting to all ranges in the table. This function is convenient if all ranges use the same setting.
Remote command:
[SENSe:]LIST:RANGe<ri>:UARange on page 113
Save Ranges
Saves the current range setup to a user-defined .csv file for later use.
Remote command:
[SENSe:]LIST:SAVE on page 119
Load Ranges
Loads a stored range setup from a .csv file. The current settings in the table are overwritten by the settings in the file!
Remote command:
[SENSe:]LIST:LOAD on page 113
Setting the Reference Level Automatically (Auto Level)
Automatically determines a reference level which ensures that no overload occurs at
the R&S FSMR3000 for the current input data. At the same time, the internal attenuators are adjusted. As a result, the signal-to-noise ratio is optimized, while signal compression and clipping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S FSMR3000.
38User Manual 1179.5547.02 ─ 01
Page 39
R&S®FSMR3-K50
5.6.2 Configuring individual ranges
Configuration
Wide Search Measurement settings
If necessary, you can optimize the reference level further. Decrease the attenuation
level manually to the lowest possible value before an overload occurs, then decrease
the reference level in the same way.
Remote command:
[SENSe:]ADJust:LEVel on page 112
Show Segment Table
Displays the segment table created for the Auto RBW function. See Chapter 5.8.1,
"Segment table", on page 46 for details.
If no optimization functions are active, the segment frequency definitions correspond to
the definition of the ranges.
Access: "Overview" > "Wide Search Settings"
The following settings can be configured individually for each range.
The "Frequency Offset" function is not range-specific and only available via the "Frequency" menu.
It defines an offset that applies to all ranges defined in the "Ranges" dialog box. The
value can be positive or negative. The offset can be used to obtain a display relative to
a certain frequency of interest.
Similarly, the "Ref Level Offset" function is not range-specific and only available via the
"Amplitude" menu.
Define an offset if the signal is attenuated or amplified before it is fed into the
R&S FSMR3 so the application shows correct power results. All displayed power level
results are shifted by this value.
Range Start / Range Stop.............................................................................................39
Spur Detection Threshold Start/ Spur Detection Threshold Stop..................................40
Limit Offset to Detection Threshold...............................................................................40
Peak Excursion............................................................................................................. 40
Minimum Spur SNR...................................................................................................... 40
Auto RBW..................................................................................................................... 41
RBW..............................................................................................................................41
Maximum Final RBW.................................................................................................... 41
Number of FFT Averages..............................................................................................41
Ref. Level......................................................................................................................42
RF Attenuation.............................................................................................................. 42
Preamplifier...................................................................................................................42
Range Start / Range Stop
Sets the start and stop frequency of the selected range. Subsequent ranges must be
defined in ascending order of frequencies; however, gaps between ranges are possible.
39User Manual 1179.5547.02 ─ 01
Page 40
R&S®FSMR3-K50
Configuration
Wide Search Measurement settings
The initial range setup is defined automatically according to the currently available
measurement span.
Remote command:
[SENSe:]LIST:RANGe<ri>[:FREQuency]:STARt on page 115
[SENSe:]LIST:RANGe<ri>[:FREQuency]:STOP on page 115
Spur Detection Threshold Start/ Spur Detection Threshold Stop
Defines the threshold that the level of a peak must exceed to be recognized as a spur.
The threshold value affects the RBW used for the spurious detection measurement:
The RBW has to be set such that the noise level is displayed slightly below the threshold.
The threshold is indicated by a blue line in the Spectral Overview and Spurious Detec-
tion Spectrum.
Note: In some cases, the R&S FSMR3 cannot display the noise below the threshold
line even with the lowest possible RBW. In this case, noise peaks are detected as
potential spurs, which slows down the measurement. Increase the Peak Excursion to
avoid detecting noise peaks as spurs.
Remote command:
[SENSe:]LIST:RANGe<ri>:THReshold:STARt on page 118
[SENSe:]LIST:RANGe<ri>:THReshold:STOP on page 118
Limit Offset to Detection Threshold
Defines a limit line as an offset to the detection threshold for each range. The limit line
is indicated by a red line in the Spurious Detection Spectrum. Values that exceed this
limit are indicated red in the Spurious Detection Table. If a violation occurs, the global
limit check over all ranges is indicated as failed.
For all spurs to be indicated as violations, set this threshold to 0.
Note: The limit line functionality used in the R&S FSMR3 base unit is not supported in
the R&S FSMR3000 spurious measurements application.
Remote command:
[SENSe:]LIST:RANGe<ri>:LOFFset on page 116
Peak Excursion
Defines the minimum level value by which the signal must rise or fall after a detected
spur so that a new spur is detected.
Note: If noise peaks are detected as potential spurs, and in particular, if the noise level
is displayed above the detection threshold after spurious detection, increase the peak
excursion. Noise peaks are removed by the spot search, but the additional process
slows down the measurement.
Remote command:
[SENSe:]LIST:RANGe<ri>:PEXCursion on page 117
Minimum Spur SNR
Defines the minimum signal-to-noise ratio (in dB) that the spur should be displayed
with after the measurement is finished (see Chapter 3.3, "Measurement process",
on page 14). The required RBW to achieve this SNR is determined automatically by
the R&S FSMR3000 spurious measurements application.
40User Manual 1179.5547.02 ─ 01
Page 41
R&S®FSMR3-K50
Configuration
Wide Search Measurement settings
Note: If the minimum SNR is not achieved for a spur during the spurious detection
measurement, the RBW is reduced during the spot search. Thus, the noise drops in a
small span around the spur.
Remote command:
[SENSe:]LIST:RANGe<ri>:SNRatio on page 118
Auto RBW
Sets the RBW for the complete range such that the noise floor is displayed slightly
below the user-defined threshold. Since the noise floor may vary across the frequencies, the RBW needs to be adapted to the signal. This is done by splitting the ranges
into smaller segments with similar signal and noise characteristics.
"On"
"Off"
Remote command:
[SENSe:]LIST:RANGe<ri>:BANDwidth:AUTO on page 113
The R&S FSMR3000 spurious measurements application divides the
ranges for which "Auto RBW" is active into segments according to the
noise and power levels measured in the Spectral Overview sweep.
The application then adapts the RBW setting within the segments so
the noise floor lies below the threshold for the displayed signal. As a
result, an additional "Segment" table is created with the used RBW
for each segment (see "Show Segment Table" on page 39).
The RBW becomes available for manual editing again and the segment table is deleted. The default parameter values are restored.
RBW
Defines the resolution bandwidth for this range (for spur detection sweep only).
"Auto" indicates that automatic RBW definition is selected (see "Auto RBW"
on page 41)
The resolution bandwidth defines the minimum frequency separation at which the indi-
vidual components of a spectrum can be distinguished. Small values result in high precision, as the distance between two distinguishable frequencies is small. Higher values
decrease the precision, but increase measurement speed.
Remote command:
[SENSe:]LIST:RANGe<ri>:BANDwidth[:RESolution] on page 114
Maximum Final RBW
Defines the maximum RBW to be used for the spot search. Measurements with a large
RBW result in a poor frequency resolution. Thus, restricting the RBW ensures a minimum resolution. However, if the maximum RBW is very low, the required noise level
may be much lower than the detection threshold and the measurement is slowed
down.
Remote command:
[SENSe:]LIST:RANGe<ri>:MFRBw on page 117
Number of FFT Averages
Defines the number of FFTs to be performed for each range or segment. The more
FFTs, the more averaging is performed, so that the noise level becomes lower (using a
positive peak detector). The trace becomes smoother.
41User Manual 1179.5547.02 ─ 01
Page 42
R&S®FSMR3-K50
Configuration
Identification settings - DUT frequency plan
However, the more FFTs are performed, the more time the complete measurement
takes.
Values between 1 and 20 are allowed.
Note: If noise peaks are detected as potential spurs, additional spot searches must be
performed, which slow down the measurement. In this case, try increasing the "Number of FFT Averages". Although more FFTs are required, the trace becomes smoother
and fewer noise peaks are detected. Thus, the total measurement time is reduced.
Remote command:
[SENSe:]LIST:RANGe<ri>:NFFT on page 117
Ref. Level
Defines or indicates the reference level for the range.
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the level is set automatically for all ranges.
Remote command:
[SENSe:]LIST:RANGe<ri>:RLEVel on page 117
RF Attenuation
Defines or indicates the RF attenuation for the range.
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the RF attenuation is set automatically for all ranges.
Remote command:
[SENSe:]LIST:RANGe<ri>:INPut:ATTenuation on page 115
Preamplifier
Switches the optional preamplifier on or off (if available).
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the preamplifier state is set automatically for all ranges.
For R&S FSMR326 or higher models, the input signal is amplified by 30 dB if the pre-
amplifier is activated.
For R&S FSMR38 or R&S FSMR313 models, the following settings are available:
"Off"
"15 dB"
"30 dB"
Remote command:
[SENSe:]LIST:RANGe<ri>:INPut:GAIN:STATe on page 115
[SENSe:]LIST:RANGe<ri>:INPut:GAIN[:VALue] on page 116
Deactivates the preamplifier.
The input signal is amplified by about 15 dB.
The input signal is amplified by about 30 dB.
5.7 Identification settings - DUT frequency plan
Access: "Overview" > "Frequency Plan"
Or: [MEAS CONFIG] > "Frequency Plan"
42User Manual 1179.5547.02 ─ 01
Page 43
R&S®FSMR3-K50
Configuration
Identification settings - DUT frequency plan
If you define the main components in the signal chain of your DUT with the corresponding frequencies, the R&S FSMR3000 spurious measurements application can
compare the determined spurious results to this frequency plan. Spurs that occur at
one of the configured frequencies, or at a harmonic of those frequencies, are identified.
Thus, you can easily detect the possible source of the spurs.
Note that the frequency plan is only used if it is enabled in the Measurement settings
settings.
When you close the "Frequency Plan" dialog box, the predicted frequencies are calculated. A dialog box indicates the process, which can take some time. If you quit the
process, no predicted frequencies are defined.
For details see Chapter 3.2, "Frequency plan and spur identification", on page 13.
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.
Number......................................................................................................................... 44
Component....................................................................................................................44
Input 1 Frequency......................................................................................................... 44
Max Harm......................................................................................................................44
Input 2 Frequency......................................................................................................... 44
Factor............................................................................................................................44
Ident 2........................................................................................................................... 44
Bandpass Center.......................................................................................................... 45
Bandpass Span.............................................................................................................45
Add Row........................................................................................................................45
Delete Row....................................................................................................................45
Save Table.................................................................................................................... 45
Load Table.....................................................................................................................45
Show Signal Chain / Hide Signal Chain........................................................................45
Export Predicted Spurs to File ..................................................................................... 45
Transfer Predicted to Directed Search Settings............................................................46
43User Manual 1179.5547.02 ─ 01
Page 44
R&S®FSMR3-K50
Configuration
Identification settings - DUT frequency plan
Number
Consecutive row number in the frequency plan. Up to 6 rows can be defined.
Component
Type of component in the signal path. Depending on the type of component, different
parameters are available.
The illustrated signal chain indicates the configured components and required parameters.
"Mixer"
"Amplifier"
"Multiplier"
"Divider"
Remote command:
[SENSe:]FPLan:COMPonent<co>:TYPE on page 123
Mixes the input signal (RF input or the output of the previous component) with a second input frequency. Requires a name (identifier) for
the second input. You can define the maximum harmonics to be considered for the mixer products.
Amplifies the input signal (RF input or the output of the previous component). No further parameters required.
Multiplies the input signal (RF input or the output of the previous component) by a configurable factor n.
Divides the input signal (RF input or the output of the previous component) by a configurable factor n.
Input 1 Frequency
For the first component, the frequency of the input signal. By default, the defined center frequency is used.
For all subsequent components, the output frequency of the previous component is
used as the input frequency.
Remote command:
[SENSe:]FPLan:COMPonent<co>:PORT<1|2>:FREQuency on page 122
Max Harm
For mixers only: maximum harmonic of each input frequency to be considered in calculating mixer products for spur identification. Up to 5 harmonics can be considered.
Remote command:
[SENSe:]FPLan:COMPonent<co>:PORT<1|2>:MHARmonic on page 122
Input 2 Frequency
Second input frequency for a mixer.
Remote command:
[SENSe:]FPLan:COMPonent<co>:PORT<1|2>:FREQuency on page 122
Factor
Factor n by which the input frequency is multiplied or divided.
Ident 2
Identifier for the second input frequency for mixers.
44User Manual 1179.5547.02 ─ 01
Page 45
R&S®FSMR3-K50
Configuration
Identification settings - DUT frequency plan
Remote command:
[SENSe:]FPLan:COMPonent<co>:IDENtity on page 121
Bandpass Center
Center of the search span that is evaluated for spur identification within the frequency
plan. By default, 1 GHz is used.
Remote command:
[SENSe:]FPLan:COMPonent<co>:BCENter on page 120
Bandpass Span
Span that is evaluated for spur identification within the frequency plan. By default,
1 GHz is used.
Remote command:
[SENSe:]FPLan:COMPonent<co>:BSPan on page 120
Add Row
Adds a row (component) to the frequency plan. Up to 6 rows are allowed.
Remote command:
[SENSe:]FPLan:COMPonent<co>:ADD on page 121
Delete Row
Deletes the selected row (component) from the frequency plan.
Remote command:
[SENSe:]FPLan:COMPonent<co>:DELete on page 121
Save Table
Saves the frequency plan table to a file.
Remote command:
[SENSe:]FPLan:SAVE on page 120
Load Table
Loads a stored frequency plan table.
Remote command:
[SENSe:]FPLan:LOAD on page 119
Show Signal Chain / Hide Signal Chain
Displays or hides the signal chain diagram for the current frequency plan settings.
The graphic is useful to determine the required parameters for each component.
Export Predicted Spurs to File ...
Saves the list of predicted frequencies to a user-defined .csv file. The result is a
comma-separated list of values with the following syntax for each predicted frequency:
<freq>,<identification>
Remote command:
[SENSe:]FPLan:PREDicted:EXPort on page 121
45User Manual 1179.5547.02 ─ 01
Page 46
R&S®FSMR3-K50
5.8 Transferring settings between measurements
5.8.1 Segment table
Configuration
Transferring settings between measurements
Transfer Predicted to Directed Search Settings
Inserts the frequencies from the frequency plan in the Directed Search Measurement
settings table. The Detection Mode is indicated as "Predicted" for these rows.
The "Frequency Plan" dialog box is closed. A new dialog box indicates that the predicted frequencies are being calculated, which can take some time. If you quit the process, no predicted frequencies are defined.
Remote command:
[SENSe:]FPLan:TRANsfer on page 128
Access: "Overview" > "Ranges" > "Show Segment Table"
Or: [MEAS CONFIG] > "Transfer" > "Segment Table" tab
The R&S FSMR3000 spurious measurements application provides a function to optimize the RBW in individual ranges for speed and accuracy (see "Auto RBW"
on page 41). If activated, the R&S FSMR3000 spurious measurements application
divides the ranges for which Auto RBW is active into segments according to the noise
and power levels measured in the Spectral Overview sweep. The application then
adapts the RBW within the segments to optimize the measurement speed and accuracy during the subsequent spur detection sweep (see Chapter 3.3, "Measurement
process", on page 14). As a result, an additional "Segment" table is created with the
used RBW for each segment. This segment table can be transferred to the "Wide
Search Settings" table to repeat the measurement with the same RBW and segment
settings. Only the settings that differ by segment are displayed (see Chapter 5.6.2,
"Configuring individual ranges", on page 39 for details on individual parameters).
46User Manual 1179.5547.02 ─ 01
Page 47
R&S®FSMR3-K50
5.8.2 Spur table
Configuration
Transferring settings between measurements
If the segments are transferred to the "Wide Search Settings", the RBW setting in each
segment is set to "Auto Off" to prevent the application from performing a new segmentation. However, the spectral overview is still performed. Thus, you can check if the signal changed and decide whether the segmentation and RBW settings are still valid. If
they are no longer valid, simply set the RBW to "Auto" mode again and segmentation
is performed as usual.
Transfer to Wide Search Settings................................................................................. 47
Transfer to Wide Search Settings
Stores all segment settings in the current "Segment" table to the "Wide Search Settings" table. Settings for individual segments cannot be transferred separately. The
Auto RBW setting is deactivated.
Remote command:
[SENSe:]TRANsfer:SEGMent on page 128
Access: "Overview" > "Transfer" > "Spur Table" tab
The frequencies from the Spurious Detection Table of a previously performed wide
search measurement are listed in the "Spur Table". Individual or all frequencies in this
list can be transferred to the "Directed Search Settings" table in order to perform a
directed search measurement on those frequencies.
47User Manual 1179.5547.02 ─ 01
Page 48
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
For each detected spur, the following information is provided (see also "Spurious
Detection Table" on page 19):
●
"Spur ID": Index of the spurs in the order they are measured (increasing frequency);
●
"Frequency": Frequency at which a power level was measured that exceeds the
Spur detection threshold defined in the "Range" settings (see Chapter 5.6.2, "Configuring individual ranges", on page 39)
●
"Level": Power level measured at the specified frequency
Selecting individual frequencies....................................................................................48
Select All Rows/ Deselect all Rows...............................................................................48
Transfer Selected Rows to Directed Search Settings................................................... 48
Selecting individual frequencies
Frequencies whose "Select" column is checked are included in the Transfer Selected
Rows to Directed Search Settings function.
Select All Rows/ Deselect all Rows
Selects or deselects all rows in the "Spur Table". Only selected frequencies are included in the Transfer Selected Rows to Directed Search Settings function.
Transfer Selected Rows to Directed Search Settings
Copies all selected frequencies to the "Directed Search Settings" table (see Chap-
ter 5.9.2, "Configuring spur search spans", on page 53). For the missing parameters
the default values are defined. The Detection Mode is indicated as "Measured" for
these rows.
If all rows are selected, this function has the same effect as the Import Measured function in the "Directed Search Settings" dialog box.
Remote command:
[SENSe:]TRANsfer:SPUR on page 128
5.9 Directed Search Measurement settings
Access: "Overview" > "Directed Search Settings"
As opposed to the wide search measurement, a directed search measurement is not
performed on a wide span of frequencies, but in small spans at predefined discrete frequencies. It assumes you already have some knowledge or expectation of where spurs
may occur. This knowledge may come from a previous wide search measurement, for
example. The spur detection sweep can thus be performed with settings optimized for
the current signal and noise levels at those frequencies.
In the "Directed Search Settings" you define the frequencies at which spurs are to be
expected: the search is directed to those frequencies. Furthermore, you define the criteria by which a spur is detected.
● Managing spans......................................................................................................49
● Configuring spur search spans............................................................................... 53
48User Manual 1179.5547.02 ─ 01
Page 49
R&S®FSMR3-K50
5.9.1 Managing spans
Configuration
Directed Search Measurement settings
Access: "Overview" > "Directed Search Settings"
The frequency spans at which the directed search measurement takes place can be
determined by the R&S FSMR3000 spurious measurements application during a wide
search measurement, or you can define them manually. The entire "Directed Search
Settings" table can be stored and loaded for subsequent measurements.
Each span is indicated in a different color. The same color is used to indicate the span
in the spectral result displays. In the Spurious Detection Table, the same color is used
to indicate the span in which a specific spur was found.
Add Row........................................................................................................................50
Delete Row....................................................................................................................50
Use Selection for All Spurs........................................................................................... 50
Sort Table by Frequency............................................................................................... 50
Common Settings for all Spurs..................................................................................... 50
└ Limit Offset to Detection Threshold.................................................................51
└ Peak Excursion...............................................................................................51
└ Maximum Final RBW...................................................................................... 51
└ Number of FFT Averages............................................................................... 51
└ Ref. Level........................................................................................................51
└ RF Attenuation................................................................................................52
└ Preamplifier.....................................................................................................52
Setting the Reference Level Automatically (Auto Level)...............................................52
Import Measured...........................................................................................................52
Import Predicted............................................................................................................52
Remove Measured........................................................................................................53
Remove Predicted.........................................................................................................53
Remove Manual............................................................................................................53
49User Manual 1179.5547.02 ─ 01
Page 50
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
Remove All....................................................................................................................53
Load Table.....................................................................................................................53
Save Table.................................................................................................................... 53
Apply Changes..............................................................................................................53
Revert Changes............................................................................................................ 53
Add Row
Inserts a new row for a further span below the currently selected row in the table.
Delete Row
Deletes the currently focused row. The row numbers are updated accordingly.
Use Selection for All Spurs
Copies the currently selected setting to all spans in the table. This function is convenient if all spans use the same setting. It is not available for the Frequency setting itself.
Sort Table by Frequency
Sorts the table entries in ascending order of the defined frequency. This is especially
useful for manual definition in order to ensure distinct frequency spans.
Common Settings for all Spurs
Defines common settings for all spans in the directed search measurement.
50User Manual 1179.5547.02 ─ 01
Page 51
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
Limit Offset to Detection Threshold ← Common Settings for all Spurs
Defines a limit line as an offset to the detection threshold for all spans. Values that
exceed this limit are indicated red in the Spurious Detection Table. If a violation occurs,
the global limit check over all spans is indicated as failed (see also "Spurious Detection
Spectrum" on page 18).
Note: The limit line functionality used in the R&S FSMR3 base unit is not supported in
the R&S FSMR3000 spurious measurements application.
Remote command:
[SENSe:]DIRected:LOFFset on page 125
Peak Excursion ← Common Settings for all Spurs
Defines the minimum level value by which the signal must rise or fall after a detected
spur so that a new spur is detected.
Remote command:
[SENSe:]DIRected:PEXCursion on page 126
Maximum Final RBW ← Common Settings for all Spurs
Defines the maximum RBW to be used for the spot search. Measurements with a large
RBW result in a poor frequency resolution. Thus, restricting the RBW ensures a minimum resolution. However, if the maximum RBW is very low, the required noise level
may be much lower than the detection threshold and the measurement is slowed
down.
Remote command:
[SENSe:]DIRected:MFRBw on page 125
Number of FFT Averages ← Common Settings for all Spurs
Defines the number of FFTs to be performed for each range or segment. The more
FFTs, the more averaging is performed, so that the noise level becomes lower (using a
positive peak detector). The trace becomes smoother.
However, the more FFTs are performed, the more time the complete measurement
takes.
Values between 1 and 20 are allowed.
Note: If noise peaks are detected as potential spurs, additional spot searches must be
performed, which slow down the measurement. In this case, try increasing the "Number of FFT Averages". Although more FFTs are required, the trace becomes smoother
and fewer noise peaks are detected. Thus, the total measurement time is reduced.
Remote command:
[SENSe:]DIRected:NFFT on page 125
Ref. Level ← Common Settings for all Spurs
Defines or indicates the reference level for the directed search measurement.
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the level is set automatically for all ranges.
Remote command:
[SENSe:]DIRected:RLEVel on page 126
51User Manual 1179.5547.02 ─ 01
Page 52
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
RF Attenuation ← Common Settings for all Spurs
Defines or indicates the RF attenuation for the directed search measurement.
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the RF attenuation is set automatically for all ranges.
Remote command:
[SENSe:]DIRected:INPut:ATTenuation on page 124
Preamplifier ← Common Settings for all Spurs
Switches the optional preamplifier on or off (if available) for the directed search measurement.
Note: If you use the Setting the Reference Level Automatically (Auto Level) function,
the preamplifier state is set automatically for all ranges.
For R&S FSMR326 or higher models, the input signal is amplified by 30 dB if the preamplifier is activated.
For R&S FSMR38 or R&S FSMR313 models, the following settings are available:
"Off"
"15 dB"
"30 dB"
Remote command:
[SENSe:]DIRected:INPut:GAIN:STATe on page 124
[SENSe:]DIRected:INPut:GAIN[:VALue] on page 124
Setting the Reference Level Automatically (Auto Level)
Automatically determines a reference level which ensures that no overload occurs at
the R&S FSMR3000 for the current input data. At the same time, the internal attenuators are adjusted. As a result, the signal-to-noise ratio is optimized, while signal compression and clipping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S FSMR3000.
If necessary, you can optimize the reference level further. Decrease the attenuation
level manually to the lowest possible value before an overload occurs, then decrease
the reference level in the same way.
Remote command:
[SENSe:]ADJust:LEVel on page 112
Import Measured
Automatically inserts rows for all frequencies from the spur table of a previously performed wide search measurement (if available, see Chapter 5.8.2, "Spur table",
on page 47). For the missing parameters, the default values are used.
The Detection Mode is indicated as "Measured" for these rows.
Deactivates the preamplifier.
The input signal is amplified by about 15 dB.
The input signal is amplified by about 30 dB.
Import Predicted
Automatically inserts rows for all frequencies from the frequency plan (if available, see
Chapter 5.7, "Identification settings - DUT frequency plan", on page 42). For the miss-
ing parameters, the default values are used.
52User Manual 1179.5547.02 ─ 01
Page 53
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
The Detection Mode is indicated as "Predicted" for these rows.
Remove Measured
Removes all rows that were imported from a previous wide search measurement (see
"Import Measured" on page 52 and "Detection Mode" on page 54).
Remove Predicted
Removes all rows that were imported from a frequency plan (see Chapter 5.7, "Identifi-
cation settings - DUT frequency plan", on page 42 and "Detection Mode" on page 54).
Remove Manual
Removes all rows that were defined manually (see "Detection Mode" on page 54).
Remove All
Deletes all rows in the "Directed Search Settings" table.
Load Table
Loads a stored search configuration from a .csv file. The current settings in the table
are overwritten by the settings in the file!
Remote command:
[SENSe:]DIRected:LOAD on page 125
Save Table
Saves the current search configuration to a user-defined .csv file for later use.
Remote command:
[SENSe:]DIRected:SAVE on page 126
Apply Changes
Saves the changes to the table.
Revert Changes
Reverts the changes that have been made in the dialog box since the last time
changes were applied.
5.9.2 Configuring spur search spans
In the "Directed Search Settings" you define the frequencies at which spurs are to be
expected: the search is directed to those frequencies. Furthermore, you define the criteria by which a spur is detected. For each frequency, the following parameters must
be defined.
Number......................................................................................................................... 54
Frequency..................................................................................................................... 54
Search Span................................................................................................................. 54
Detection Threshold......................................................................................................54
Minimum Spur SNR...................................................................................................... 54
Detection Mode.............................................................................................................54
Conflict.......................................................................................................................... 55
53User Manual 1179.5547.02 ─ 01
Page 54
R&S®FSMR3-K50
Configuration
Directed Search Measurement settings
Number
Sequential number of the possible spurs (read-only). If a spur is detected at the specified frequency, this number is used as a spur ID in the results (see Spurious Detection
Spectrum and "Spurious Detection Table" on page 19).
Frequency
Defines the frequency at which spurs are searched for.
Remote command:
[SENSe:]DIRected:SETTings on page 127
[SENSe:]DIRected:SAVE on page 126
Search Span
Defines the span around the frequency for which a detailed measurement (spurious
detection sweep and spur frequency scan, see Chapter 3.3, "Measurement process",
on page 14) is performed.
Note that the frequency spans must be distinct, that is: they may not overlap.
Remote command:
[SENSe:]DIRected:SETTings on page 127
[SENSe:]DIRected:SAVE on page 126
Detection Threshold
Defines an absolute threshold that the power level must exceed for a spur to be detected (see Chapter 3.3, "Measurement process", on page 14).
Remote command:
[SENSe:]DIRected:SETTings on page 127
[SENSe:]DIRected:SAVE on page 126
Minimum Spur SNR
Defines the minimum signal-to-noise ratio (in dB) that the spur must be displayed with
after the measurement is finished (see Chapter 3.3, "Measurement process",
on page 14). The required RBW to achieve this SNR is determined automatically by
the R&S FSMR3000 spurious measurements application.
Remote command:
[SENSe:]DIRected:SETTings on page 127
[SENSe:]DIRected:SAVE on page 126
Detection Mode
Indicates how the frequencies in the table were detected.
This information is useful in order to delete all manually defined or all measured
(imported) frequencies in the table in one step (see Remove Measured / Remove Man-
ual).
"Entered"
"Measured"
Remote command:
[SENSe:]DIRected:SAVE on page 126
Frequency settings were entered manually by the user.
Frequency settings were imported from the results of a previous wide
search measurement (see Chapter 5.8.2, "Spur table", on page 47)
54User Manual 1179.5547.02 ─ 01
Page 55
R&S®FSMR3-K50
5.10 Display configuration
Configuration
Result configuration
Conflict
Indicates whether a conflict between entries in the table has occurred. In particular, the
frequency spans must be distinct, that is: they may not overlap. Conflicting settings are
also indicated in red.
Tip: For manually defined frequencies, it may be useful to sort the entries by frequency
in order to detect overlapping frequency spans. See "Sort Table by Frequency"
on page 50.
Access: "Overview" > "Display Config"
The captured signal can be displayed using various evaluation methods. All evaluation
methods available for the R&S FSMR3000 spurious measurements application are displayed in the evaluation bar in SmartGrid mode.
Up to sixteen evaluation methods can be displayed simultaneously in separate windows. The evaluation methods available for Spurious are described in Chapter 4.1,
"Evaluation methods", on page 16.
For details on working with the SmartGrid see the R&S FSMR3 Getting Started manual.
5.11 Result configuration
Access: [MEAS CONFIG] > "Result Config"
Some additional settings are available to configure the result displays of the spur
detection measurements.
5.11.1 Spurious detection table configuration
Access: [MEAS CONFIG] > "Result Config" > "Table Config"
55User Manual 1179.5547.02 ─ 01
Page 56
R&S®FSMR3-K50
Configuration
Result configuration
Selects the numerical results to be displayed in the "Spurious Detection Table".
Reduce the number of results to display in the table in order to use the available display space optimally or reduce the time to store the results (see MMEMory:STORe<n>:
TABLe on page 164).
For a description of the individual results see "Spurious Detection Table" on page 19.
Remote command:
CALCulate:SSEarch:TABLe:COLumn on page 136
5.11.2 Results settings
Access: [MEAS CONFIG] > "Result Config" > "Results Settings" tab
The following settings configure the graphical results for spur detection measurements.
56User Manual 1179.5547.02 ─ 01
Page 57
R&S®FSMR3-K50
Configuration
Result configuration
Show Detection Threshold Lines.................................................................................. 57
Show Limit Offset Lines.................................................................................................57
Show Messages............................................................................................................57
Displaying Colored Range Bars....................................................................................57
└ Modify Bar Colors........................................................................................... 57
Show Detection Threshold Lines
Hides or displays the blue line indicating the power levels at which a spur is detected
(see "Spur Detection Threshold Start/ Spur Detection Threshold Stop" on page 40 and
"Detection Threshold" on page 54).
Show Limit Offset Lines
Hides or displays the red line indicating the maximum power levels that spurs must not
exceed (see "Limit Offset to Detection Threshold" on page 40 and "Limit Offset to
Detection Threshold" on page 51).
Show Messages
Hides or displays messages concerning the measurement result display (see step 4 in
the Chapter 3.3, "Measurement process", on page 14).
Displaying Colored Range Bars
In the spectral result displays and result tables, the ranges are displayed in different
colors by default so you can easily identify which range a spur was detected in. These
bars can be deactivated, and you can modify the bar colors.
Modify Bar Colors ← Displaying Colored Range Bars
Opens a dialog box to define the colors for ranges. Up to ten different range colors can
be specified. If more ranges are defined, the colors are repeated.
Select a range, then select the color to be assigned to that range.
57User Manual 1179.5547.02 ─ 01
Page 58
R&S®FSMR3-K50
5.12 Sweep settings
Configuration
Adjusting settings automatically
Access: [SWEEP]
The sweep settings define how often data from the input signal is acquired and then
evaluated.
Continuous Sweep / Run Cont......................................................................................58
Single Sweep / Run Single............................................................................................58
Continuous Sweep / Run Cont
After triggering, starts the measurement and repeats it continuously until stopped.
While the measurement is running, the "Continuous Sweep" softkey and the [RUN
CONT] key are highlighted. The running measurement can be aborted by selecting the
highlighted softkey or key again. The results are not deleted until a new measurement
is started.
Note: Sequencer. Furthermore, the [RUN CONT] key controls the Sequencer, not individual sweeps. [RUN CONT] starts the Sequencer in continuous mode.
Remote command:
INITiate<n>:CONTinuous on page 138
Single Sweep / Run Single
After triggering, starts the number of sweeps set in "Sweep Count". The measurement
stops after the defined number of sweeps has been performed.
While the measurement is running, the "Single Sweep" softkey and the [RUN SINGLE]
key are highlighted. The running measurement can be aborted by selecting the highlighted softkey or key again.
Note: Sequencer. Furthermore, the [RUN SINGLE] key controls the Sequencer, not
individual sweeps. [RUN SINGLE] starts the Sequencer in single mode.
If the Sequencer is off, only the evaluation for the currently displayed channel is updated.
Remote command:
INITiate<n>[:IMMediate] on page 138
5.13 Adjusting settings automatically
Some settings can be adjusted by the R&S FSMR3 automatically according to the current measurement settings. In order to do so, a measurement is performed.
58User Manual 1179.5547.02 ─ 01
Page 59
R&S®FSMR3-K50
Configuration
Adjusting settings automatically
Adjusting settings automatically during triggered measurements
When you select an auto adjust function an (untriggered) measurement is performed to
determine the optimal settings. The trigger source is temporarily set to "Free Run".
After the measurement is completed, the original trigger source is restored.
Auto Carrier...................................................................................................................59
Setting the Reference Level Automatically (Auto Level)...............................................59
Auto Carrier
Automatically detects the highest peak over the complete frequency range of the analyzer. This value is considered to be the reference carrier and is indicated in Carrier
Level.
Note: This functionality is identical to Measure Carrier in the "Carrier Reference Level"
settings.
Remote command:
[SENSe:]ADJust:CARRier on page 108
Setting the Reference Level Automatically (Auto Level)
Automatically determines a reference level which ensures that no overload occurs at
the R&S FSMR3000 for the current input data. At the same time, the internal attenuators are adjusted. As a result, the signal-to-noise ratio is optimized, while signal compression and clipping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S FSMR3000.
If necessary, you can optimize the reference level further. Decrease the attenuation
level manually to the lowest possible value before an overload occurs, then decrease
the reference level in the same way.
Remote command:
[SENSe:]ADJust:LEVel on page 112
59User Manual 1179.5547.02 ─ 01
Page 60
R&S®FSMR3-K50
6 Analysis
6.1 Y-Scaling
Analysis
Y-Scaling
● Y-Scaling................................................................................................................. 60
● Trace settings..........................................................................................................62
● Trace / table export configuration............................................................................62
● Markers................................................................................................................... 64
● Display line settings................................................................................................ 72
Access: [AMPT] > "Scale Config"
The scaling for the vertical axis of the spectral diagrams is highly configurable, using
either absolute or relative values.
Automatic Grid Scaling..................................................................................................61
Auto Scale Once........................................................................................................... 61
Absolute Scaling (Min/Max Values)...............................................................................61
Relative Scaling (Reference/ per Division)....................................................................61
└ Per Division.....................................................................................................61
└ Ref Position.....................................................................................................61
└ Ref Value........................................................................................................ 62
60User Manual 1179.5547.02 ─ 01
Page 61
R&S®FSMR3-K50
Analysis
Y-Scaling
Automatic Grid Scaling
The y-axis is scaled automatically after each sweep according to the current measurement settings and results (continuously).
Tip: To update the scaling automatically once when this setting for continuous scaling
is off, use the "Auto Scale Once" on page 61 button or the softkey in the [AUTO SET]
menu.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<n>]:TRACe<t>:Y[:SCALe]:AUTO
on page 139
Auto Scale Once
Automatically determines the optimal range and reference level position to be displayed for the current measurement settings.
The display is only set once; it is not adapted further if the measurement settings are
changed again.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<n>]:TRACe<t>:Y[:SCALe]:AUTO
on page 139
Absolute Scaling (Min/Max Values)
Define the scaling using absolute minimum and maximum values.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:MAXimum on page 140
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:MINimum on page 140
Relative Scaling (Reference/ per Division)
Define the scaling relative to a reference value, with a specified value range per division.
Per Division ← Relative Scaling (Reference/ per Division)
Defines the value range to be displayed per division of the diagram (1/10 of total
range).
Note: The value defined per division refers to the default display of 10 divisions on the
y-axis. If fewer divisions are displayed (e.g. because the window is reduced in height),
the range per division is increased in order to display the same result range in the
smaller window. In this case, the per division value does not correspond to the actual
display.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<w>]:TRACe<t>:Y[:SCALe]:PDIVision
on page 140
Ref Position ← Relative Scaling (Reference/ per Division)
Defines the position of the reference value in percent of the total y-axis range.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<w>]:TRACe<t>:Y[:SCALe]:RPOSition
on page 141
61User Manual 1179.5547.02 ─ 01
Page 62
R&S®FSMR3-K50
6.2 Trace settings
Analysis
Trace / table export configuration
Ref Value ← Relative Scaling (Reference/ per Division)
Defines the reference value to be displayed at the specified reference position.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RVALue on page 141
Access: [Trace]
The trace settings determine how the measured data is analyzed and displayed in the
window. In the result displays for the R&S FSMR3000 spurious measurements application, only one (clear/write) trace is available and it cannot be configured except for the
number of trace points. However, the result trace can be exported to a file (see Chap-
ter 6.3, "Trace / table export configuration", on page 62).
Trace Points
The number of trace points that are displayed in the result diagrams. Particularly in the
Spurious Detection Spectrum display, where several spur frequency scans are per-
formed, many more sweep points are captured than can be displayed on the screen. In
this case, the trace data is reduced to the defined number of trace points using the
maximum peak detector.
By default, 32001 trace points are used to allow for zooming. However, if you want to
export the trace data, the files may become very large.
Remote command:
[SENSe:]MEASure:POINts on page 157
6.3 Trace / table export configuration
Access: "Trace" > "Trace/Table Export"
The R&S FSMR3 provides various evaluation methods for the results of the performed
measurements. However, you may want to evaluate the data with other, external applications. In this case, you can export the measurement data to an ASCII file.
The standard data management functions (e.g. saving or loading instrument settings)
that are available for all R&S FSMR3 applications are not described here.
See the R&S FSMR3 User Manual for a description of the standard functions.
62User Manual 1179.5547.02 ─ 01
Page 63
R&S®FSMR3-K50
Analysis
Trace / table export configuration
Include Instrument & Measurement Settings................................................................ 63
Decimal Separator........................................................................................................ 63
Columns to Export.........................................................................................................63
Export Data to ASCII File for All Windows.................................................................... 64
Export Data to ASCII File for Specific Window............................................................. 64
Include Instrument & Measurement Settings
Includes additional instrument and measurement settings in the header of the export
file for result data.
Remote command:
FORMat:DEXPort:HEADer on page 163
Decimal Separator
Defines the decimal separator for floating-point numerals for the data export/import
files. Evaluation programs require different separators in different languages.
Remote command:
FORMat:DEXPort:DSEParator on page 163
Columns to Export
Defines which of the Spurious Detection Table columns are to be included in the export
file.
"Visible"
"All"
Only the currently visible columns in the table are exported (see
Chapter 5.11.1, "Spurious detection table configuration", on page 55).
All columns for the table, including currently hidden ones, are exported.
63User Manual 1179.5547.02 ─ 01
Page 64
R&S®FSMR3-K50
Analysis
Markers
Export Data to ASCII File for All Windows
Exports the data from all currently displayed traces and tables in the R&S FSMR3000
spurious measurements application for export to an ASCII file.
The results are output in the same order as they are displayed on the screen: window
by window, trace by trace, and table row by table row.
Remote command:
MMEMory:STORe:SPUR:MEAS on page 164
Export Data to ASCII File for Specific Window
Exports the data from the specified window in the R&S FSMR3000 spurious measurements application for export to an ASCII file.
The results are output in the same order as they are displayed in the window: trace by
trace, and table row by table row.
Remote command:
MMEMory:STORe<n>:TABLe on page 164
MMEMory:STORe<n>:TRACe on page 165
6.4 Markers
Access: [MKR]
Markers help you analyze your measurement results by determining particular values
in the diagram. Thus you can extract numeric values from a graphical display.
● Individual marker settings....................................................................................... 64
● General marker settings..........................................................................................68
● Marker search settings and positioning functions................................................... 69
6.4.1 Individual marker settings
Access: [MKR] > "Marker Config"
Up to 17 markers or delta markers can be activated for each window simultaneously.
64User Manual 1179.5547.02 ─ 01
Page 65
R&S®FSMR3-K50
Analysis
Markers
Window-specific configuration
The settings in this dialog box are specific to the selected window. To configure the settings for a different Spurious window, select the window outside the displayed dialog
box, or select the window from the "Specifics for" selection list in the dialog box.
Delta Marker 1 / Marker 2 / Marker 3 / ... Marker 16 / Norm / Delta..............................65
Selected Marker............................................................................................................66
Marker State..................................................................................................................66
Marker Position X-value................................................................................................66
Marker Type..................................................................................................................66
Reference Marker......................................................................................................... 66
Linking to Another Marker.............................................................................................67
Assigning the Marker to a Trace................................................................................... 67
Select Marker................................................................................................................67
All Markers Off...............................................................................................................67
Delta Marker 1 / Marker 2 / Marker 3 / ... Marker 16 / Norm / Delta
The "Marker X" softkey activates the corresponding marker and opens an edit dialog
box to enter the marker position ("X-value"). Pressing the softkey again deactivates the
selected marker.
Marker 1 is always the default reference marker for relative measurements. If activated, markers 2 to 16 are delta markers that refer to marker 1. These markers can be
converted into markers with absolute value display using the "Marker Type" function.
Note: If normal marker 1 is the active marker, pressing the "Mkr Type" softkey switches
on an additional delta marker 1.
Remote command:
CALCulate<n>:MARKer<m>[:STATe] on page 147
CALCulate<n>:MARKer<m>:X on page 147
CALCulate<n>:MARKer<m>:Y? on page 166
65User Manual 1179.5547.02 ─ 01
Page 66
R&S®FSMR3-K50
Analysis
Markers
CALCulate<n>:DELTamarker<m>[:STATe] on page 144
CALCulate<n>:DELTamarker<m>:X on page 145
CALCulate<n>:DELTamarker<m>:X:RELative? on page 166
CALCulate<n>:DELTamarker<m>:Y? on page 166
Selected Marker
Marker name. The marker which is currently selected for editing is highlighted orange.
Remote command:
Marker selected via suffix <m> in remote commands.
Marker State
Activates or deactivates the marker in the diagram.
Remote command:
CALCulate<n>:MARKer<m>[:STATe] on page 147
CALCulate<n>:DELTamarker<m>[:STATe] on page 144
Marker Position X-value
Defines the position (x-value) of the marker in the diagram. For normal markers, the
absolute position is indicated. For delta markers, the position relative to the reference
marker is provided.
Remote command:
CALCulate<n>:MARKer<m>:X on page 147
CALCulate<n>:DELTamarker<m>:X on page 145
Marker Type
Toggles the marker type.
The type for marker 1 is always "Normal", the type for delta marker 1 is always "Delta".
These types cannot be changed.
Note: If normal marker 1 is the active marker, switching the "Mkr Type" activates an
additional delta marker 1. For any other marker, switching the marker type does not
activate an additional marker, it only switches the type of the selected marker.
"Normal"
"Delta"
Remote command:
CALCulate<n>:MARKer<m>[:STATe] on page 147
CALCulate<n>:DELTamarker<m>[:STATe] on page 144
Reference Marker
Defines a marker as the reference marker which is used to determine relative analysis
results (delta marker values).
Remote command:
CALCulate<n>:DELTamarker<m>:MREFerence on page 144
A normal marker indicates the absolute value at the defined position
in the diagram.
A delta marker defines the value of the marker relative to the specified reference marker (marker 1 by default).
66User Manual 1179.5547.02 ─ 01
Page 67
R&S®FSMR3-K50
Analysis
Markers
Linking to Another Marker
Links the current marker to the marker selected from the list of active markers. If the xaxis value of the initial marker is changed, the linked marker follows to the same position on the x-axis. Linking is off by default.
Using this function you can set two markers on different traces to measure the difference (e.g. between a max hold trace and a min hold trace or between a measurement
and a reference trace).
Remote command:
CALCulate<n>:MARKer<ms>:LINK:TO:MARKer<md> on page 146
CALCulate<n>:DELTamarker<ms>:LINK:TO:MARKer<md> on page 143
CALCulate<n>:DELTamarker<m>:LINK on page 142
Assigning the Marker to a Trace
The "Trace" setting assigns the selected marker to an active trace. Currently, only one
trace is available in any Spurious result display.
Remote command:
CALCulate<n>:MARKer<m>:TRACe on page 147
Select Marker
The "Select Marker" function opens a dialog box to select and activate or deactivate
one or more markers quickly.
Remote command:
CALCulate<n>:MARKer<m>[:STATe] on page 147
CALCulate<n>:DELTamarker<m>[:STATe] on page 144
All Markers Off
Deactivates all markers in one step.
Remote command:
CALCulate<n>:MARKer<m>:AOFF on page 145
67User Manual 1179.5547.02 ─ 01
Page 68
R&S®FSMR3-K50
6.4.2 General marker settings
Analysis
Markers
Access: [MKR] > "Marker Config" > "Marker Settings" tab
Marker Table Display
Defines how the marker information is displayed.
"On"
"Off"
"Auto"
Remote command:
DISPlay[:WINDow<n>]:MTABle on page 148
Marker Info
Turns the marker information displayed in the diagram on and off.
Displays the marker information in a table in a separate area beneath
the diagram.
No separate marker table is displayed.
If Marker Info is active, the marker information is displayed within the
diagram area.
(Default) If more than two markers are active, the marker table is displayed automatically.
If Marker Info is active, the marker information for up to two markers
is displayed in the diagram area.
68User Manual 1179.5547.02 ─ 01
Page 69
R&S®FSMR3-K50
Analysis
Markers
Remote command:
DISPlay[:WINDow<n>]:MINFo[:STATe] on page 149
Linking Markers Across Windows
If enabled, the markers in all diagrams are linked, i.e. when you move a marker in one
window, the markers in all other windows are moved to the same x-value.
Remote command:
CALCulate<n>:MARKer:LINK on page 148
6.4.3 Marker search settings and positioning functions
Access: [MKR TO]
Several functions are available to set the marker to a specific position very quickly and
easily, or to use the current marker position to define another characteristic value. In
order to determine the required marker position, searches may be performed. The
search results can be influenced by special settings.
● Marker search settings............................................................................................69
● Positioning functions............................................................................................... 70
6.4.3.1 Marker search settings
Access: [MKR TO] > "Search Config"
Configuration settings allow you to influence the peak search results.
69User Manual 1179.5547.02 ─ 01
Page 70
R&S®FSMR3-K50
Analysis
Markers
Search Mode for Next Peak..........................................................................................70
Peak Excursion............................................................................................................. 70
Search Mode for Next Peak
Selects the search mode for the next peak search.
"Left"
"Absolute"
"Right"
Remote command:
Chapter 8.5.5, "Positioning the marker", on page 152
Peak Excursion
Defines the minimum level value by which a signal must rise or fall so that it is identified as a maximum or a minimum by the search functions.
Entries from 0 dB to 60 dB are allowed; the resolution is 0.1 dB. The default setting for
the peak excursion is 6 dB.
Remote command:
CALCulate<n>:MARKer<m>:PEXCursion on page 149
Determines the next maximum/minimum to the left of the current
peak.
Determines the next maximum/minimum to either side of the current
peak.
Determines the next maximum/minimum to the right of the current
peak.
6.4.3.2 Positioning functions
Access: [MKR ->]
70User Manual 1179.5547.02 ─ 01
Page 71
R&S®FSMR3-K50
Analysis
Markers
The following functions set the currently selected marker to the result of a peak search
or set other characteristic values to the current marker value.
Peak Search..................................................................................................................71
Search Next Peak......................................................................................................... 71
Search Minimum........................................................................................................... 71
Search Next Minimum...................................................................................................71
Peak Search
Sets the selected marker/delta marker to the maximum of the trace. If no marker is
active, marker 1 is activated.
Remote command:
CALCulate<n>:MARKer<m>:MAXimum[:PEAK] on page 153
CALCulate<n>:DELTamarker<m>:MAXimum[:PEAK] on page 155
Search Next Peak
Sets the selected marker/delta marker to the next (lower) maximum of the assigned
trace. If no marker is active, marker 1 is activated.
Remote command:
CALCulate<n>:MARKer<m>:MAXimum:NEXT on page 153
CALCulate<n>:MARKer<m>:MAXimum:RIGHt on page 153
CALCulate<n>:MARKer<m>:MAXimum:LEFT on page 152
CALCulate<n>:DELTamarker<m>:MAXimum:NEXT on page 155
CALCulate<n>:DELTamarker<m>:MAXimum:RIGHt on page 155
CALCulate<n>:DELTamarker<m>:MAXimum:LEFT on page 154
Search Minimum
Sets the selected marker/delta marker to the minimum of the trace. If no marker is
active, marker 1 is activated.
Remote command:
CALCulate<n>:MARKer<m>:MINimum[:PEAK] on page 154
CALCulate<n>:DELTamarker<m>:MINimum[:PEAK] on page 156
Search Next Minimum
Sets the selected marker/delta marker to the next (higher) minimum of the selected
trace. If no marker is active, marker 1 is activated.
Remote command:
CALCulate<n>:MARKer<m>:MINimum:NEXT on page 154
CALCulate<n>:MARKer<m>:MINimum:LEFT on page 153
CALCulate<n>:MARKer<m>:MINimum:RIGHt on page 154
CALCulate<n>:DELTamarker<m>:MINimum:NEXT on page 156
CALCulate<n>:DELTamarker<m>:MINimum:LEFT on page 155
CALCulate<n>:DELTamarker<m>:MINimum:RIGHt on page 156
71User Manual 1179.5547.02 ─ 01
Page 72
R&S®FSMR3-K50
6.5 Display line settings
Analysis
Display line settings
Two vertical and two horizontal lines can be defined in the display.
The limit line functionality used in the R&S FSMR3 base unit is not supported in the
R&S FSMR3000 spurious measurements application.
Vertical Line <x>............................................................................................................72
Horizontal Line 1/ Horizontal Line 2.............................................................................. 72
Vertical Line <x>
Activates a vertical display line in the diagram at the specified point of the x-axis,
depending on the scale of the axis.
Remote command:
CALCulate<n>:FLINe<dl> on page 158
CALCulate<n>:TLINe<dl> on page 159
Horizontal Line 1/ Horizontal Line 2
Activates a horizontal display line (H1 or H2) in the diagram at the specified point of the
y-axis.
Remote command:
CALCulate<n>:DLINe<dl> on page 157
CALCulate<n>:DLINe<dl> on page 157
72User Manual 1179.5547.02 ─ 01
Page 73
R&S®FSMR3-K50
7 How to perform Spurious measurements
7.1 How to perform a Wide Search Measurement
How to perform Spurious measurements
How to perform a Wide Search Measurement
The following step-by-step instructions demonstrate how to perform a Spurious measurement with the R&S FSMR3000 spurious measurements application.
● How to perform a Wide Search Measurement........................................................73
● How to perform a Directed Search Measurement...................................................74
● How to perform a combined Wide Search Measurement and Directed Search Mea-
surement................................................................................................................. 75
● How to perform a spurious search measurement with a DUT frequency plan........76
1. Press the [MODE] key on the front panel and select the "Spurious" application.
2. Select the "Overview" softkey to display the "Overview" for a Spurious measurement.
3. Select the "Input/Output/Trigger" button and configure the input source of the signal
to be measured.
4. Optionally, select the "Trigger" tab to define an event that starts the measurement.
5. From the "Overview", select the "Measurement Control" button to configure the
type of measurement to be performed.
a) Select "Type of Spur Search": "Wide Search".
b) Define what to do with the residual spurs in the results by selecting the required
options.
6. From the "Overview", select the "Wide Search Settings" button to configure the
measurement ranges.
Tip: for parameters that are identical for all ranges, enter the parameter value
once, then use the Use Selection for All Ranges function.
a) Split the frequency span of the measurement into ranges for signal parts with
similar characteristics. Define the ranges in ascending order of frequency.
Gaps between ranges are allowed, overlapping ranges are not. Leave out parts
of the signal that are not of interest. Insert ranges as necessary.
b) Define an absolute power level as the threshold to be used as a search crite-
rion in detecting spurs.
Each peak above the threshold is a potential spur.
c) Define the minimum signal-to-noise ratio a true spur must have after the mea-
surement is finished.
d) Optionally, define a limit for a limit check on the spurs as an offset to the spur
detection threshold.
e) Define the measurement parameters for each range as appropriate.
7. To start the measurement, press the [RUN SINGLE] key.
73User Manual 1179.5547.02 ─ 01
Page 74
R&S®FSMR3-K50
How to perform Spurious measurements
How to perform a Directed Search Measurement
First the "Spectral Overview" diagram is displayed, then the "Spurious Detection
Spectrum" diagram and the "Spurious Detection Table". Finally, the displays are
updated with the results of the spot searches.
Which segment or span is currently being measured is indicated in the status bar
information.
The spur detection threshold line is indicated by a blue line in the spectrum displays.
The limit line (if defined) is indicated by a red line in the spectrum displays.
8. If an optimization function is active and you intend to perform another wide search
measurement on the same or a similar signal, check the segmentation:
a) Select "Transfer" > "Segment Table" tab.
b) If you want to be able to repeat the measurement, you can save the segment
configuration for subsequent measurements.
Select "Transfer to Wide Search Ranges Table".
For the next wide search measurement, no new segmenting will take place. The
spurious detection search uses the configured segments and ranges.
9. Optionally, export the trace data of the spurious detection measurement to a file.
a) Press the [TRACE] key.
b) Select the "Trace Export Config" softkey.
c) Select the data to be included in the export - traces or tables only, or also mea-
surement settings.
d) Select "Export Data to ASCII File".
e) Define a file name and storage location and select "OK".
7.2 How to perform a Directed Search Measurement
1. Press the [MODE] key on the front panel and select the "Spurious" application.
2. Select the "Overview" softkey to display the "Overview" for a Spurious measurement.
3. Select the "Input/Output/Trigger" button and configure the input source of the signal
to be measured.
4. Optionally, select the "Trigger" tab to define an event that starts the measurement.
5. From the "Overview", select the "Measurement Control" button to configure the
type of measurement to be performed.
a) Select "Type of Spur Search": "Directed Search".
b) Define what to do with the residual spurs in the results by selecting the required
options.
6. From the "Overview", select the "Directed Search Settings" button.
7. To configure the frequencies to perform a spur search on, do one of the following:
74User Manual 1179.5547.02 ─ 01
Page 75
R&S®FSMR3-K50
How to perform a combined Wide Search Measurement and Directed Search Measurement
How to perform Spurious measurements
● Load a predefined table from a file ("Load Table").
● Import frequencies from the Spurious Detection Table of a previous wide
search measurement (see Chapter 7.3, "How to perform a combined Wide
Search Measurement and Directed Search Measurement", on page 75).
● Define the frequencies manually:
a) Add a new row for each frequency to be measured.
b) Define the frequencies in any order.
c) Define the span around the frequency to be searched.
Note that the frequency spans must be distinct. If any spans overlap, a conflict
is indicated.
d) Define an absolute power level as the threshold to be used as a search crite-
rion in detecting spurs.
Each peak above the threshold is a potential spur.
e) Define the minimum signal-to-noise ratio a true spur must have after the mea-
surement is finished.
f) Optionally, define a limit for a limit check on the spurs as an offset to the spur
detection threshold.
8. Optionally, store the directed search settings to a file for further measurements:
a) Select "Save Table".
b) Define a file name and storage location and select "OK".
9. To start the measurement, press the [RUN SINGLE] key.
First the "Spectral Overview" diagram is displayed, then the "Spurious Detection
Spectrum" diagram and the "Spurious Detection Table". Finally, the displays are
updated with the results of the spot searches.
Which segment or span is currently being measured is indicated in the status bar
information.
The spur detection threshold line is indicated by a blue line in the spectrum displays.
The limit line (if defined) is indicated by a red line in the spectrum displays.
7.3 How to perform a combined Wide Search Measurement and Directed Search Measurement
1. Perform a wide search measurement as described in Chapter 7.1, "How to perform
a Wide Search Measurement", on page 73.
2. Select "Measurement Control" > "Type of Spur Search": "Directed Search".
3. To import the frequencies from the "Spurious Detection Table" of a previous wide
search measurement, do one of the following:
● To load all spur frequencies from the spur table, select "Directed Search Settings" > "Import Measured".
75User Manual 1179.5547.02 ─ 01
Page 76
R&S®FSMR3-K50
How to perform Spurious measurements
How to perform a spurious search measurement with a DUT frequency plan
● To select individual spur frequencies to import:
a) Select "Transfer" > "Spur Table" tab.
b) Select the frequencies to be imported.
c) Select "Transfer Selected Rows to Directed Search Table".
d) Select "Directed Search Settings" to view the search frequencies.
Entries with the "Detection mode": "Measured" are imported from the "Spur
Table".
e) Check the frequencies and edit the search span, detection threshold and
required spur SNR parameters as required.
4. Optionally, store the directed search settings to a file for further measurements:
a) Select "Directed Search Settings" > "Save Table".
b) Define a file name and storage location and select "OK".
5. To start the measurement, press the [RUN SINGLE] key.
First the "Spectral Overview" diagram is displayed, then the "Spurious Detection
Spectrum" diagram and the "Spurious Detection Table". Finally, the displays are
updated with the results of the spot searches.
Which segment or span is currently being measured is indicated in the status bar
information.
The spur detection threshold line is indicated by a blue line in the spectrum displays.
The limit line (if defined) is indicated by a red line in the spectrum displays.
7.4 How to perform a spurious search measurement with a DUT frequency plan
1. Press the [MODE] key on the front panel and select the "Spurious" application.
2. Select the "Overview" softkey to display the "Overview" for a Spurious measure-
ment.
3. Select the "Input/Output/Trigger" button and configure the input source of the signal
to be measured.
4. Optionally, select the "Trigger" tab to define an event that starts the measurement.
5. From the "Overview", select the "Measurement Control" button to configure the
type of measurement to be performed.
a) Select the "Type of Spur Search".
"Wide Search": the complete range is search for spurs
"Directed Search": only the specified frequencies are searched for spurs (see
also step 8)
b) Enable "Use Frequency Plan for Identification".
76User Manual 1179.5547.02 ─ 01
Page 77
R&S®FSMR3-K50
How to perform Spurious measurements
How to perform a spurious search measurement with a DUT frequency plan
c) Define what to do with the residual spurs in the results by selecting the required
options.
6. From the "Overview", select the "Frequency Plan" button.
7. In the "Frequency Plan" dialog box, configure the parameters for each component
in the signal chain of your DUT (max. 5):
● The component type
● The input frequency (for the first component only)
● The second input frequency (mixer only)
● The maximum harmonic to be considered (mixer only)
● The identification of the second input (mixer only)
● The factor (for multipliers and dividers)
● Optionally, the bandpass center and span to analyze
8. Optionally, for "Directed Search": Select "Transfer Predicted to Directed Search
Settings".
The "Frequency Plan" dialog box is closed. The predicted frequencies are calcula-
ted and inserted in the Directed Search Settings Table. A dialog box indicates the
process, which can take some time. If you quit the process, no predicted frequencies are defined.
9. Optionally, configure the measurement as described in Chapter 7.1, "How to per-
form a Wide Search Measurement", on page 73 or Chapter 7.2, "How to perform a
Directed Search Measurement", on page 74.
10. To start the measurement, press the [RUN SINGLE] key.
First the "Spectral Overview" diagram is displayed, then the "Spurious Detection
Spectrum" diagram and the "Spurious Detection Table". Finally, the displays are
updated with the results of the spot searches.
Which segment or span is currently being measured is indicated in the status bar
information.
The spur detection threshold line is indicated by a blue line in the spectrum displays.
The limit line (if defined) is indicated by a red line in the spectrum displays.
77User Manual 1179.5547.02 ─ 01
Page 78
R&S®FSMR3-K50
8 Remote commands to perform Spurious
Remote commands to perform Spurious measurements
measurements
The following commands are required to perform measurements in the
R&S FSMR3000 spurious measurements application in a remote environment. It is
assumed that the R&S FSMR3 has already been set up for remote operation in a network as described in the R&S FSMR3 User Manual.
Common Suffixes
In the R&S FSMR3000 spurious measurements application, the following common suffixes are used in remote commands:
Table 8-1: Common suffixes used in remote commands in the R&S FSMR3000 spurious measure-
Suffix Value range Description
<m> 1 to 16 Marker
<n> 1 to 16 Window (in the currently selected channel)
<t> 1 to 6 Trace
<li> 1 to 8 Limit line
Note that basic tasks that are also performed in the base unit in the same way are not
described here. For a description of such tasks, see the R&S FSMR3 User Manual.
In particular, this includes:
●
●
●
The following tasks specific to the R&S FSMR3000 spurious measurements application are described here:
● Introduction............................................................................................................. 79
● Activating Spurious measurements.........................................................................83
● Configuring Spurious measurements......................................................................86
● Performing measurements....................................................................................137
● Analyzing Spurious measurements.......................................................................139
● Retrieving results.................................................................................................. 159
● Status reporting system........................................................................................ 167
● Programming examples: spurious emissions measurements...............................167
ments application
Managing Settings and Results, i.e. storing and loading settings and result data
Basic instrument configuration, e.g. checking the system configuration, customizing
the screen layout, or configuring networks and remote operation
Using the common status registers
78User Manual 1179.5547.02 ─ 01
Page 79
R&S®FSMR3-K50
8.1 Introduction
Remote commands to perform Spurious measurements
Introduction
Commands are program messages that a controller (e.g. a PC) sends to the instrument or software. They operate its functions ('setting commands' or 'events') and
request information ('query commands'). Some commands can only be used in one
way, others work in two ways (setting and query). If not indicated otherwise, the commands can be used for settings and queries.
The syntax of a SCPI command consists of a header and, usually, one or more parameters. To use a command as a query, you have to append a question mark after the
last header element, even if the command contains a parameter.
A header contains one or more keywords, separated by a colon. Header and parameters are separated by a "white space" (ASCII code 0 to 9, 11 to 32 decimal, e.g. blank).
If there is more than one parameter for a command, they are separated by a comma
from one another.
Only the most important characteristics that you need to know when working with SCPI
commands are described here. For a more complete description, refer to the user
manual of the R&S FSMR3.
Remote command examples
Note that some remote command examples mentioned in this general introduction are
possibly not supported by this particular application.
8.1.1 Conventions used in descriptions
The following conventions are used in the remote command descriptions:
●
Command usage
If not specified otherwise, commands can be used both for setting and for querying
parameters.
If a command can be used for setting or querying only, or if it initiates an event, the
usage is stated explicitly.
●
Parameter usage
If not specified otherwise, a parameter can be used to set a value and it is the
result of a query.
Parameters required only for setting are indicated as Setting parameters.
Parameters required only to refine a query are indicated as Query parameters.
Parameters that are only returned as the result of a query are indicated as Return
values.
●
Conformity
Commands that are taken from the SCPI standard are indicated as SCPI confirmed. All commands used by the R&S FSMR3 follow the SCPI syntax rules.
●
Asynchronous commands
A command which does not automatically finish executing before the next command starts executing (overlapping command) is indicated as an Asynchronous
command.
●
Reset values (*RST)
79User Manual 1179.5547.02 ─ 01
Page 80
R&S®FSMR3-K50
8.1.2 Long and short form
Remote commands to perform Spurious measurements
Introduction
Default parameter values that are used directly after resetting the instrument (*RST
command) are indicated as *RST values, if available.
●
Default unit
The default unit is used for numeric values if no other unit is provided with the
parameter.
●
Manual operation
If the result of a remote command can also be achieved in manual operation, a link
to the description is inserted.
The keywords have a long and a short form. You can use either the long or the short
form, but no other abbreviations of the keywords.
The short form is emphasized in uppercase letters. Note however, that this emphasis
only serves the purpose to distinguish the short from the long form in the manual. For
the instrument, the case does not matter.
Example:
SENSe:FREQuency:CENTer is the same as SENS:FREQ:CENT.
8.1.3 Numeric suffixes
Some keywords have a numeric suffix if the command can be applied to multiple
instances of an object. In that case, the suffix selects a particular instance (e.g. a measurement window).
Numeric suffixes are indicated by angular brackets (<n>) next to the keyword.
If you do not quote a suffix for keywords that support one, a 1 is assumed.
Example:
DISPlay[:WINDow<1...4>]:ZOOM:STATe enables the zoom in a particular measurement window, selected by the suffix at WINDow.
DISPlay:WINDow4:ZOOM:STATe ON refers to window 4.
8.1.4 Optional keywords
Some keywords are optional and are only part of the syntax because of SCPI compliance. You can include them in the header or not.
If an optional keyword has a numeric suffix and you need to use the suffix, you have to
include the optional keyword. Otherwise, the suffix of the missing keyword is assumed
to be the value 1.
Optional keywords are emphasized with square brackets.
80User Manual 1179.5547.02 ─ 01
Page 81
R&S®FSMR3-K50
8.1.5 Alternative keywords
Remote commands to perform Spurious measurements
Introduction
Example:
Without a numeric suffix in the optional keyword:
[SENSe:]FREQuency:CENTer is the same as FREQuency:CENTer
With a numeric suffix in the optional keyword:
DISPlay[:WINDow<1...4>]:ZOOM:STATe
DISPlay:ZOOM:STATe ON enables the zoom in window 1 (no suffix).
DISPlay:WINDow4:ZOOM:STATe ON enables the zoom in window 4.
A vertical stroke indicates alternatives for a specific keyword. You can use both keywords to the same effect.
Example:
[SENSe:]BANDwidth|BWIDth[:RESolution]
In the short form without optional keywords, BAND 1MHZ would have the same effect
as BWID 1MHZ.
8.1.6 SCPI parameters
Many commands feature one or more parameters.
If a command supports more than one parameter, they are separated by a comma.
Example:
LAYout:ADD:WINDow Spectrum,LEFT,MTABle
Parameters can have different forms of values.
● Numeric values....................................................................................................... 81
● Boolean...................................................................................................................82
● Character data........................................................................................................ 83
● Character strings.....................................................................................................83
● Block data............................................................................................................... 83
8.1.6.1 Numeric values
Numeric values can be entered in any form, i.e. with sign, decimal point or exponent.
For physical quantities, you can also add the unit. If the unit is missing, the command
uses the basic unit.
Example:
With unit: SENSe:FREQuency:CENTer 1GHZ
Without unit: SENSe:FREQuency:CENTer 1E9 would also set a frequency of 1 GHz.
81User Manual 1179.5547.02 ─ 01
Page 82
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Introduction
Values exceeding the resolution of the instrument are rounded up or down.
If the number you have entered is not supported (e.g. for discrete steps), the command
returns an error.
Instead of a number, you can also set numeric values with a text parameter in special
cases.
●
MIN/MAX
Defines the minimum or maximum numeric value that is supported.
●
DEF
Defines the default value.
●
UP/DOWN
Increases or decreases the numeric value by one step. The step size depends on
the setting. Sometimes, you can customize the step size with a corresponding
command.
Querying numeric values
When you query numeric values, the system returns a number. For physical quantities,
it applies the basic unit (e.g. Hz for frequencies). The number of digits after the decimal
point depends on the type of numeric value.
Example:
Setting: SENSe:FREQuency:CENTer 1GHZ
Query: SENSe:FREQuency:CENTer? would return 1E9
Sometimes, numeric values are returned as text.
●
INF/NINF
Infinity or negative infinity. Represents the numeric values 9.9E37 or -9.9E37.
●
NAN
Not a number. Represents the numeric value 9.91E37. NAN is returned if errors
occur.
8.1.6.2 Boolean
Boolean parameters represent two states. The "on" state (logically true) is represented
by "ON" or the numeric value 1. The "off" state (logically untrue) is represented by
"OFF" or the numeric value 0.
Querying Boolean parameters
When you query Boolean parameters, the system returns either the value 1 ("ON") or
the value 0 ("OFF").
Example:
Setting: DISPlay:WINDow:ZOOM:STATe ON
Query: DISPlay:WINDow:ZOOM:STATe? would return 1
82User Manual 1179.5547.02 ─ 01
Page 83
R&S®FSMR3-K50
8.1.6.3 Character data
8.1.6.4 Character strings
Remote commands to perform Spurious measurements
Activating Spurious measurements
Character data follows the syntactic rules of keywords. You can enter text using a short
or a long form. For more information, see Chapter 8.1.2, "Long and short form",
on page 80.
Querying text parameters
When you query text parameters, the system returns its short form.
Example:
Setting: SENSe:BANDwidth:RESolution:TYPE NORMal
Query: SENSe:BANDwidth:RESolution:TYPE? would return NORM
Strings are alphanumeric characters. They have to be in straight quotation marks. You
can use a single quotation mark ( ' ) or a double quotation mark ( " ).
Example:
INSTRument:DELete 'Spectrum'
8.1.6.5 Block data
Block data is a format which is suitable for the transmission of large amounts of data.
The ASCII character # introduces the data block. The next number indicates how many
of the following digits describe the length of the data block. The data bytes follow. During the transmission of these data bytes, all end or other control signs are ignored until
all bytes are transmitted. #0 specifies a data block of indefinite length. The use of the
indefinite format requires an NL^END message to terminate the data block. This format
is useful when the length of the transmission is not known or if speed or other considerations prevent segmentation of the data into blocks of definite length.
8.2 Activating Spurious measurements
Spuriousmeasurements require a special application on the R&S FSMR3. A measurement is started immediately with the default settings.
INSTrument:CREate[:NEW].............................................................................................. 84
INSTrument:CREate:REPLace..........................................................................................84
INSTrument:DELete......................................................................................................... 84
INSTrument:LIST?........................................................................................................... 85
INSTrument:REName.......................................................................................................85
INSTrument[:SELect]........................................................................................................86
SYSTem:PRESet:CHANnel[:EXEC]................................................................................... 86
83User Manual 1179.5547.02 ─ 01
Page 84
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Activating Spurious measurements
INSTrument:CREate[:NEW] <ChannelType>, <ChannelName>
This command adds a measurement channel. You can configure up to 10 measurement channels at the same time (depending on available memory).
Parameters:
<ChannelType> Channel type of the new channel.
For a list of available channel types, see INSTrument:LIST?
on page 85.
<ChannelName> String containing the name of the channel.
Note that you cannot assign an existing channel name to a new
channel. If you do, an error occurs.
Example:
INSTrument:CREate:REPLace <ChannelName1>,<ChannelType>,<ChannelName2>
This command replaces a channel with another one.
Setting parameters:
<ChannelName1> String containing the name of the channel you want to replace.
<ChannelType> Channel type of the new channel.
<ChannelName2> String containing the name of the new channel.
Example:
INST:CRE SAN, 'Spectrum 2'
Adds a spectrum display named "Spectrum 2".
For a list of available channel types, see INSTrument:LIST?
on page 85.
Note: If the specified name for a new channel already exists, the
default name, extended by a sequential number, is used for the
new channel (see INSTrument:LIST? on page 85).
Channel names can have a maximum of 31 characters, and
must be compatible with the Windows conventions for file
names. In particular, they must not contain special characters
such as ":", "*", "?".
INST:CRE:REPL 'Measuring Receiver
2',MREC,'Measuring Receiver 3'
Replaces the channel named "Measuring Receiver 2" by a new
channel of type "Measuring Receiver" named "Measuring
Receiver 3".
Usage: Setting only
INSTrument:DELete <ChannelName>
This command deletes a channel.
If you delete the last channel, the default Measuring Receiver channel is activated.
Setting parameters:
<ChannelName> String containing the name of the channel you want to delete.
A channel must exist to delete it.
84User Manual 1179.5547.02 ─ 01
Page 85
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Activating Spurious measurements
Example:
INST:DEL 'Measuring Receiver 2'
Deletes the channel with the name 'Measuring Receiver 2'.
Usage: Setting only
INSTrument:LIST?
This command queries all active channels. The query is useful to obtain the names of
the existing channels, which are required to replace or delete the channels.
Return values:
<ChannelType>,
<ChannelName>
For each channel, the command returns the channel type and
channel name (see tables below).
Tip: to change the channel name, use the INSTrument:
REName command.
Example:
INST:LIST?
Result for 2 channels:
'MREC','Measuring Receiver','MREC','Measuring
Receiver 2'
Usage: Query only
Table 8-2: Available channel types and default channel names
Application <ChannelType> Parameter Default Channel Name*)
Measuring Receiver MRECeiver Measuring Receiver
Spectrum (R&S FSMR3B1)
I/Q Analyzer (R&S FSMR3B1)
Phase Noise
(R&S FSMR3-B60)
Pulse (R&S FSMR3-K6) PULSE Pulse
Avionics (R&S FSMR3K15)
Vector Signal Analysis
(VSA, R&S FSMR3-K70)
Note: the default channel name is also listed in the table. If the specified name for a new channel already
exists, the default name, extended by a sequential number, is used for the new channel.
SANalyzer Spectrum
IQ IQ Analyzer
PNOise Phase Noise
AVIonics Avionics
DDEM VSA
INSTrument:REName <ChannelName1>, <ChannelName2>
This command renames a channel.
Setting parameters:
<ChannelName1> String containing the name of the channel you want to rename.
85User Manual 1179.5547.02 ─ 01
Page 86
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
<ChannelName2> String containing the new channel name.
Note that you cannot assign an existing channel name to a new
channel. If you do, an error occurs.
Channel names can have a maximum of 31 characters, and
must be compatible with the Windows conventions for file
names. In particular, they must not contain special characters
such as ":", "*", "?".
Example:
Usage: Setting only
INSTrument[:SELect] <ChannelType>
This command activates a new measurement channel with the defined channel type,
or selects an existing measurement channel with the specified name.
See also INSTrument:CREate[:NEW] on page 84.
Parameters:
<ChannelType> SPUR
Example:
SYSTem:PRESet:CHANnel[:EXEC]
This command restores the default instrument settings in the current channel.
INST:REN 'Measuring Receiver 2','Measuring
Receiver 3'
Renames the channel with the name 'Measuring Receiver 2' to
'Measuring Receiver 3'.
R&S FSMR3000 spurious measurements application,
R&S FSMR3–K50
INST:SEL SPUR
Use INST:SEL to select the channel.
Example:
Usage: Event
Manual operation: See "Preset Channel" on page 23
INST:SEL 'Spectrum2'
Selects the channel for "Spectrum2".
SYST:PRES:CHAN:EXEC
Restores the factory default settings to the "Spectrum2" channel.
8.3 Configuring Spurious measurements
● Configuring the data input.......................................................................................87
● Configuring triggered measurements....................................................................100
● Measurement control commands..........................................................................106
● Carrier reference level commands........................................................................108
● Wide Search Measurement settings commands...................................................112
86User Manual 1179.5547.02 ─ 01
Page 87
R&S®FSMR3-K50
8.3.1 Configuring the data input
8.3.1.1 RF input
Remote commands to perform Spurious measurements
Configuring Spurious measurements
● Frequency plan identification commands..............................................................119
● Directed Search Measurement settings commands............................................. 123
● Transferring settings between measurements......................................................128
● Configuring the result displays..............................................................................129
The following commands are required to configure data input.
● RF input...................................................................................................................87
● Working with power sensors................................................................................... 90
INPut<ip>:ATTenuation:PROTection:RESet.........................................................................87
INPut<ip>:ATTenuation:PROTection[:STATe].......................................................................87
INPut<ip>:COUPling.........................................................................................................88
INPut<ip>:DPATh.............................................................................................................88
INPut<ip>:FILTer:HPASs[:STATe].......................................................................................89
INPut<ip>:FILTer:YIG[:STATe]............................................................................................89
INPut<ip>:IMPedance.......................................................................................................89
INPut<ip>:SELect.............................................................................................................90
INPut<ip>:ATTenuation:PROTection:RESet
This command resets the attenuator and reconnects the RF input with the input mixer
for the R&S FSMR3000 after an overload condition occurred and the protection mechanism intervened. The error status bit (bit 3 in the STAT:QUES:POW status register)
and the INPUT OVLD message in the status bar are cleared.
The command works only if the overload condition has been eliminated first.
Suffix:
<ip>
.
1 | 2
irrelevant
Example:
INP:ATT:PROT:RES
INPut<ip>:ATTenuation:PROTection[:STATe] <State>
This command turns the availability of attenuation levels of 10 dB or less on and off.
Suffix:
<ip>
.
1 | 2
irrelevant
Parameters:
<State> ON | OFF | 1 | 0
87User Manual 1179.5547.02 ─ 01
Page 88
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
ON | 1
Attenuation levels of 10 dB or less are not allowed to protect the
RF input connector of the R&S FSMR3000.
OFF | 0
Attenuation levels of 10 dB or less are not blocked. Provide
appropriate protection for the RF input connector of the
R&S FSMR3000 yourself.
*RST: 1
Example:
INPut<ip>:COUPling <CouplingType>
This command selects the coupling type of the RF input.
Suffix:
<ip>
Parameters:
<CouplingType> AC | DC
Example:
Manual operation: See "Input Coupling" on page 25
INP:ATT:PROT ON
Turns on the input protection.
.
1 | 2
irrelevant
AC
AC coupling
DC
DC coupling
*RST: AC
INP:COUP DC
INPut<ip>:DPATh <DirectPath>
Enables or disables the use of the direct path for frequencies close to 0 Hz.
Suffix:
<ip>
Parameters:
<DirectPath> AUTO | OFF
Example:
.
1 | 2
irrelevant
AUTO | 1
(Default) the direct path is used automatically for frequencies
close to 0 Hz.
OFF | 0
The analog mixer path is always used.
INP:DPAT OFF
88User Manual 1179.5547.02 ─ 01
Page 89
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
INPut<ip>:FILTer:HPASs[:STATe] <State>
Activates an additional internal high-pass filter for RF input signals from 1 GHz to
3 GHz. This filter is used to remove the harmonics of the R&S FSMR3000 to measure
the harmonics for a DUT, for example.
This function requires an additional high-pass filter 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.)
Suffix:
<ip>
Parameters:
<State> ON | OFF | 0 | 1
Example:
Manual operation: See "High Pass Filter 1 to 3 GHz" on page 25
INPut<ip>:FILTer:YIG[:STATe] <State>
Enables or disables the YIG filter.
Suffix:
<ip>
.
1 | 2
irrelevant
OFF | 0
Switches the function off
ON | 1
Switches the function on
*RST: 0
INP:FILT:HPAS ON
Turns on the filter.
.
1 | 2
irrelevant
Example:
Manual operation: See "YIG-Preselector" on page 25
INPut<ip>:IMPedance <Impedance>
This command selects the nominal input impedance of the RF input. In some applications, only 50 Ω are supported.
Suffix:
<ip>
INP:FILT:YIG OFF
Deactivates the YIG-preselector.
.
1 | 2
irrelevant
89User Manual 1179.5547.02 ─ 01
Page 90
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Parameters:
<Impedance> 50 | 75
*RST: 50 Ω
Default unit: OHM
Example:
INP:IMP 75
Manual operation: See "Impedance" on page 25
INPut<ip>:SELect <Source>
This command selects the signal source for measurements, i.e. it defines which connector is used to input data to the R&S FSMR3.
Suffix:
<ip>
.
1 | 2
irrelevant
Parameters:
<Source> RF
Radio Frequency ("RF INPUT" connector)
*RST: RF
Manual operation: See "Radio Frequency State" on page 24
8.3.1.2 Working with power sensors
The following commands describe how to work with power sensors.
These commands require the use of a Rohde & Schwarz power sensor. For a list of
supported sensors, see the data sheet.
● Configuring power sensors..................................................................................... 90
● Configuring power sensor measurements.............................................................. 92
● Triggering with power sensors................................................................................ 98
Configuring power sensors
SYSTem:COMMunicate:RDEVice:PMETer<p>:CONFigure:AUTO[:STATe].............................90
SYSTem:COMMunicate:RDEVice:PMETer<p>:COUNt?.......................................................91
SYSTem:COMMunicate:RDEVice:PMETer<p>:DEFine........................................................ 91
SYSTem:COMMunicate:RDEVice:PMETer<p>:CONFigure:AUTO[:STATe] <State>
This command turns automatic assignment of a power sensor to the power sensor
index on and off.
Suffix:
<p>
.
Power sensor index
Parameters:
<State> ON | OFF | 0 | 1
*RST: 1
90User Manual 1179.5547.02 ─ 01
Page 91
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Example:
SYSTem:COMMunicate:RDEVice:PMETer<p>:COUNt?
This command queries the number of power sensors currently connected to the
R&S FSMR3.
Suffix:
<p>
Return values:
<NumberSensors> Number of connected power sensors.
Example:
Usage: Query only
SYSTem:COMMunicate:RDEVice:PMETer<p>:DEFine
<Interface>, <SerialNo>
This command assigns the power sensor with the specified serial number to the
selected power sensor index (configuration).
The query returns the power sensor type and serial number of the sensor assigned to
the specified index.
SYST:COMM:RDEV:PMET:CONF:AUTO OFF
.
Power sensor index
SYST:COMM:RDEV:PMET:COUN?
<Placeholder>, <Type>,
Suffix:
<p>
Parameters:
<Placeholder> Currently not used
<Type> Detected power sensor type, e.g. "NRP-Z81".
<Interface> Interface the power sensor is connected to; always "USB"
<SerialNo> Serial number of the power sensor assigned to the specified
Example:
.
Power sensor index
index
SYST:COMM:RDEV:PMET2:DEF '','NRP-Z81','',
'123456'
Assigns the power sensor with the serial number '123456' to the
configuration "Power Sensor 2".
SYST:COMM:RDEV:PMET2:DEF?
Queries the sensor assigned to "Power Sensor 2".
Result:
'','NRP-Z81','USB','123456'
The NRP-Z81 power sensor with the serial number '123456' is
assigned to the "Power Sensor 2".
91User Manual 1179.5547.02 ─ 01
Page 92
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Configuring power sensor measurements
CALibration:PMETer<p>:ZERO:AUTO ONCE..................................................................... 92
CALCulate<n>:PMETer<p>:RELative[:MAGNitude]..............................................................92
CALCulate<n>:PMETer<p>:RELative[:MAGNitude]:AUTO ONCE......................................... 93
CALCulate<n>:PMETer<p>:RELative:STATe.......................................................................93
FETCh:PMETer<p>?........................................................................................................ 93
READ:PMETer<p>?......................................................................................................... 93
[SENSe:]PMETer<p>:DCYCle[:STATe]............................................................................... 94
[SENSe:]PMETer<p>:DCYCle:VALue.................................................................................94
[SENSe:]PMETer<p>:FREQuency..................................................................................... 94
[SENSe:]PMETer<p>:FREQuency:LINK............................................................................. 95
[SENSe:]PMETer<p>:MTIMe.............................................................................................95
[SENSe:]PMETer<p>:MTIMe:AVERage:COUNt...................................................................95
[SENSe:]PMETer<p>:MTIMe:AVERage[:STATe].................................................................. 96
[SENSe:]PMETer<p>:ROFFset[:STATe]..............................................................................96
[SENSe:]PMETer<p>:SOFFset..........................................................................................96
[SENSe:]PMETer<p>[:STATe]............................................................................................97
[SENSe:]PMETer<p>:UPDate[:STATe]................................................................................97
UNIT<n>:PMETer<p>:POWer............................................................................................97
UNIT<n>:PMETer<p>:POWer:RATio.................................................................................. 98
CALibration:PMETer<p>:ZERO:AUTO ONCE
This command zeroes the power sensor.
Note that you have to disconnect the signals from the power sensor input before you
start to zero the power sensor. Otherwise, results are invalid.
Suffix:
<p>
Example:
.
Power sensor index
CAL:PMET2:ZERO:AUTO ONCE;*WAI
Starts zeroing the power sensor 2 and delays the execution of
further commands until zeroing is concluded.
Usage: Event
CALCulate<n>:PMETer<p>:RELative[:MAGNitude] <RefValue>
This command defines the reference value for relative measurements.
Suffix:
<n>
.
Window
<p> Power sensor index
Parameters:
<RefValue> Range: -200 dBm to 200 dBm
*RST: 0
Default unit: DBM
92User Manual 1179.5547.02 ─ 01
Page 93
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Example:
CALCulate<n>:PMETer<p>:RELative[:MAGNitude]:AUTO ONCE
This command sets the current measurement result as the reference level for relative
measurements.
Suffix:
<n>
<p> Power sensor index
Example:
Usage: Event
CALCulate<n>:PMETer<p>:RELative:STATe <State>
This command turns relative power sensor measurements on and off.
Suffix:
<n>
CALC:PMET2:REL -30
Sets the reference value for relative measurements to -30 dBm
for power sensor 2.
.
Window
CALC:PMET2:REL:AUTO ONCE
Takes the current measurement value as reference value for relative measurements for power sensor 2.
.
Window
<p> Power sensor index
Parameters:
<State> ON | OFF | 0 | 1
OFF | 0
Switches the function off
ON | 1
Switches the function on
Example:
FETCh:PMETer<p>?
This command queries the results of power sensor measurements.
Suffix:
<p>
Usage: Query only
READ:PMETer<p>?
CALC:PMET2:REL:STAT ON
Activates the relative display of the measured value for power
sensor 2.
.
Power sensor index
This command initiates a power sensor measurement and queries the results.
93User Manual 1179.5547.02 ─ 01
Page 94
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Suffix:
<p>
Usage: Query only
[SENSe:]PMETer<p>:DCYCle[:STATe] <State>
This command turns the duty cycle correction on and off.
Suffix:
<p>
Parameters:
<State> ON | OFF | 0 | 1
Example:
[SENSe:]PMETer<p>:DCYCle:VALue <Percentage>
This command defines the duty cycle for the correction of pulse signals.
.
Power sensor index
.
Power sensor index
OFF | 0
Switches the function off
ON | 1
Switches the function on
PMET2:DCYC:STAT ON
The power sensor uses the duty cycle in combination with the mean power to calculate
the power of the pulse.
Suffix:
<p>
Parameters:
<Percentage> Range: 0.001 to 99.999
Example:
[SENSe:]PMETer<p>:FREQuency <Frequency>
This command defines the frequency of the power sensor.
Suffix:
<p>
Parameters:
<Frequency> The available value range is specified in the data sheet of the
.
Power sensor
*RST: 99.999
Default unit: %
PMET2:DCYC:STAT ON
Activates the duty cycle correction.
PMET2:DCYC:VAL 0.5
Sets the correction value to 0.5%.
.
Power sensor index
power sensor in use.
*RST: 50 MHz
Default unit: HZ
94User Manual 1179.5547.02 ─ 01
Page 95
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Example:
[SENSe:]PMETer<p>:FREQuency:LINK <Coupling>
This command selects the frequency coupling for power sensor measurements.
Suffix:
<p>
Parameters:
<Coupling> CENTer
Example:
PMET2:FREQ 1GHZ
Sets the frequency of the power sensor to 1 GHz.
.
Power sensor index
Couples the frequency to the center frequency of the analyzer
MARKer1
Couples the frequency to the position of marker 1
OFF
Switches the frequency coupling off
*RST: CENTer
PMET2:FREQ:LINK CENT
Couples the frequency to the center frequency of the analyzer
[SENSe:]PMETer<p>:MTIMe <Duration>
This command selects the duration of power sensor measurements.
Suffix:
<p>
Parameters:
<Duration> SHORt | NORMal | LONG
Example:
[SENSe:]PMETer<p>:MTIMe:AVERage:COUNt <NumberReadings>
This command sets the number of power readings included in the averaging process of
power sensor measurements.
Extended averaging yields more stable results for power sensor measurements, especially for measurements on signals with a low power, because it minimizes the effects
of noise.
Suffix:
<p>
.
Power sensor index
*RST: NORMal
PMET2:MTIM SHOR
Sets a short measurement duration for measurements of stationary high power signals for the selected power sensor.
.
Power sensor index
95User Manual 1179.5547.02 ─ 01
Page 96
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Parameters:
<NumberReadings> An average count of 0 or 1 performs one power reading.
Range: 0 to 256
Increment: binary steps (1, 2, 4, 8, ...)
Example:
[SENSe:]PMETer<p>:MTIMe:AVERage[:STATe] <State>
This command turns averaging for power sensor measurements on and off.
Suffix:
<p>
Parameters:
<State> ON | OFF | 0 | 1
Example:
[SENSe:]PMETer<p>:ROFFset[:STATe] <State>
PMET2:MTIM:AVER ON
Activates manual averaging.
PMET2:MTIM:AVER:COUN 8
Sets the number of readings to 8.
.
Power sensor index
OFF | 0
Switches the function off
ON | 1
Switches the function on
PMET2:MTIM:AVER ON
Activates manual averaging.
This command includes or excludes the reference level offset of the analyzer for power
sensor measurements.
Suffix:
<p>
Parameters:
<State> ON | OFF | 0 | 1
Example:
[SENSe:]PMETer<p>:SOFFset <SensorOffset>
Takes the specified offset into account for the measured power. Only available if
[SENSe:]PMETer<p>:ROFFset[:STATe] is disabled.
.
Power sensor index
OFF | 0
Switches the function off
ON | 1
Switches the function on
PMET2:ROFF OFF
Takes no offset into account for the measured power.
96User Manual 1179.5547.02 ─ 01
Page 97
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Suffix:
<p>
Parameters:
<SensorOffset> Default unit: DB
Example:
[SENSe:]PMETer<p>[:STATe] <State>
This command turns a power sensor on and off.
Suffix:
<p>
Parameters:
<State> ON | OFF | 0 | 1
Example:
.
Power sensor index
PMET2:TRIG:SOFF 0.001
.
Power sensor index
OFF | 0
Switches the function off
ON | 1
Switches the function on
PMET1 ON
Switches the power sensor measurements on.
[SENSe:]PMETer<p>:UPDate[:STATe] <State>
This command turns continuous update of power sensor measurements on and off.
If on, the results are updated even if a single sweep is complete.
Suffix:
<p>
Parameters:
<State> ON | OFF | 0 | 1
Example:
UNIT<n>:PMETer<p>:POWer <Unit>
This command selects the unit for absolute power sensor measurements.
Suffix:
<n>
.
Power sensor index
OFF | 0
Switches the function off
ON | 1
Switches the function on
PMET1:UPD ON
The data from power sensor 1 is updated continuously.
.
irrelevant
<p> Power sensor index
97User Manual 1179.5547.02 ─ 01
Page 98
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Parameters:
<Unit> DBM | WATT | W | DB | PCT
*RST: DBM
Example:
UNIT:PMET:POW DBM
UNIT<n>:PMETer<p>:POWer:RATio <Unit>
This command selects the unit for relative power sensor measurements.
Suffix:
<n>
.
irrelevant
<p> Power sensor index
Parameters:
<Unit> DB | PCT
*RST: DB
Example:
UNIT:PMET:POW:RAT DB
Triggering with power sensors
[SENSe:]PMETer<p>:TRIGger:DTIMe................................................................................98
[SENSe:]PMETer<p>:TRIGger:HOLDoff.............................................................................98
[SENSe:]PMETer<p>:TRIGger:HYSTeresis.........................................................................99
[SENSe:]PMETer<p>:TRIGger:LEVel.................................................................................99
[SENSe:]PMETer<p>:TRIGger:SLOPe............................................................................... 99
[SENSe:]PMETer<p>:TRIGger[:STATe].............................................................................100
[SENSe:]PMETer<p>:TRIGger:DTIMe <Time>
This command defines the time period that the input signal has to stay below the IF
power trigger level before the measurement starts.
Suffix:
<p>
.
Power sensor index
Parameters:
<Time> Range: 0 s to 1 s
Increment: 100 ns
*RST: 100 µs
Default unit: S
Example:
PMET2:TRIG:DTIMe 0.001
[SENSe:]PMETer<p>:TRIGger:HOLDoff <Holdoff>
This command defines the trigger holdoff for external power triggers.
Suffix:
<p>
.
Power sensor index
98User Manual 1179.5547.02 ─ 01
Page 99
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Parameters:
<Holdoff> Time period that has to pass between the trigger event and the
start of the measurement, in case another trigger event occurs.
Range: 0 s to 1 s
Increment: 100 ns
*RST: 0 s
Default unit: S
Example:
[SENSe:]PMETer<p>:TRIGger:HYSTeresis <Hysteresis>
This command defines the trigger hysteresis for external power triggers.
The hysteresis in dB is the value the input signal must stay below the IF power trigger
level to allow a trigger to start the measurement.
Suffix:
<p>
Parameters:
<Hysteresis> Range: 3 dB to 50 dB
Example:
[SENSe:]PMETer<p>:TRIGger:LEVel <Level>
PMET2:TRIG:HOLD 0.1
Sets the holdoff time of the trigger to 100 ms
.
Power sensor index
Increment: 1 dB
*RST: 0 dB
Default unit: DB
PMET2:TRIG:HYST 10
Sets the hysteresis of the trigger to 10 dB.
This command defines the trigger level for external power triggers.
Suffix:
<p>
Parameters:
<Level> -20 to +20 dBm
Example:
[SENSe:]PMETer<p>:TRIGger:SLOPe <Edge>
This command selects the trigger condition for external power triggers.
.
Power sensor index
Range: -20 dBm to 20 dBm
*RST: -10 dBm
Default unit: DBM
PMET2:TRIG:LEV -10 dBm
Sets the level of the trigger
99User Manual 1179.5547.02 ─ 01
Page 100
R&S®FSMR3-K50
Remote commands to perform Spurious measurements
Configuring Spurious measurements
Suffix:
<p>
.
Power sensor index
Parameters:
<Edge> POSitive
The measurement starts in case the trigger signal shows a positive edge.
NEGative
The measurement starts in case the trigger signal shows a negative edge.
*RST: POSitive
Example:
[SENSe:]PMETer<p>:TRIGger[:STATe]
PMET2:TRIG:SLOP NEG
<State>
This command turns the external power trigger on and off.
Suffix:
<p>
.
Power sensor index
Parameters:
<State> ON | OFF | 0 | 1
OFF | 0
Switches the function off
ON | 1
Switches the function on
Example:
PMET2:TRIG ON
Switches the external power trigger on
8.3.2 Configuring triggered measurements
● Configuring the triggering conditions.....................................................................100
● Configuring the trigger output................................................................................104
8.3.2.1 Configuring the triggering conditions
The following commands are required to configure a triggered measurement.
TRIGger[:SEQuence]:DTIMe...........................................................................................101
TRIGger[:SEQuence]:HOLDoff[:TIME]..............................................................................101
TRIGger[:SEQuence]:IFPower:HOLDoff...........................................................................101
TRIGger[:SEQuence]:IFPower:HYSTeresis.......................................................................101
TRIGger[:SEQuence]:LEVel[:EXTernal<port>]...................................................................102
TRIGger[:SEQuence]:LEVel:IFPower...............................................................................102
TRIGger[:SEQuence]:LEVel:RFPower..............................................................................102
TRIGger[:SEQuence]:SLOPe.......................................................................................... 103
TRIGger[:SEQuence]:SOURce........................................................................................103
100User Manual 1179.5547.02 ─ 01
Loading...