Rohde&Schwarz FS-K7 User Manual

R&S

®

FS

-

K7

Test and Measurement

anual

FM Measurement Demodulator for
R&S FSx

Software Manual

1141.1821.42 – 07

Software M

The Software Manual R&S®FS-K7 describes the following Options:

● R&S®FS-K7

© 2014 Rohde & Schwarz GmbH & Co. KG
81671 Munich, Germany
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.

The following abbreviations are used throughout this manual:
R&S®FS-K7 is abbreviated as R&S FS-K7.

R&S FS-K7 Table of Contents

Table of Contents

1 Introduction ......................................................................................... 1

1.1 Circuit Description - Block Diagrams ........................................................................ 1

1.2 Further Characteristics ............................................................................................... 4

1.2.1 IF Bandwidth .................................................................................................................. 4

1.2.2 Demodulation Bandwidth ............................................................................................... 4

1.2.3 AF Trigger ...................................................................................................................... 5

1.2.4 Stability of Measurement Results .................................................................................. 5

2 Settings of the FM Demodulator ........................................................ 6

2.1 FM Demodulator Main Menu ....................................................................................... 6

2.1.1 Selection of Filter and Deemphasis – AF FILTER Menu ............................................... 9

2.1.2 Selection of Display Mode – RESULT DISPLAY Menu...............................................12

2.1.3 Scaling of Measurement Results – RANGE Menu ......................................................17

2.1.4 Scaling Functions for FM, PM and AM Result Display ................................................17

2.1.5 Scaling Functions for Result Displays with Level Display ...........................................20

2.2 FREQ Key ...................................................................................................................21

2.3 SPAN Key ...................................................................................................................22

2.4 AMPT Key ...................................................................................................................24

2.5 BW Key .......................................................................................................................24

2.6 TRIG Key .....................................................................................................................26

2.7 MKR Key .....................................................................................................................30

2.8 MKR  Key .................................................................................................................31

2.9 MKR FCTN Key ...........................................................................................................31

2.10 MEAS Key ...................................................................................................................32

2.11 Other Keys ..................................................................................................................32

3 Multicarrier Phase Measurement ..................................................... 33

3.1 Orthogonal Method ....................................................................................................33

3.2 Flattop Method ...........................................................................................................34

3.3 Group Delay Measurements .....................................................................................34

3.4 Settings –MC PHASE RESPONSE Menu .................................................................34

3.4.2 Selection of Result Display – RESULT DISPLAY Menu ............................................37

3.4.3 Scaling of Measurement Results –RANGE Menu .......................................................39

Software Manual 1141.1821.42 - 07 I-1

R&S FS-K7 Table of Contents

3.4.4 Scaling Functions for Result Displays with Phase Diagrams ......................................40

4 Remote Control - Description of Commands ................................. 41

4.1 Common Commands .................................................................................................41

4.2 CALCulate Subsystem ..............................................................................................41

4.2.1 CALCulate:ADEMod Subsystem ................................................................................41

4.2.2 CALCulate:DELTamarker Subsystem .........................................................................44

4.2.3 CALCulate:FEED Subsystem ......................................................................................45

4.2.4 CALCulate:FORMat Subsystem .................................................................................46

4.2.5 CALCulate:MARKer Subsystem ..................................................................................46

4.2.6 CALCulate:MARKer:FUNCtion:ADEMod Subsystem ..................................................47

4.2.7 CALCulate:UNIT Subsystem .......................................................................................53

4.3 DISPlay Subsystem ...................................................................................................54

4.4 INSTrument Subsystem ............................................................................................56

4.5 SENSe Subsystem .....................................................................................................56

4.5.1 [SENSe:]ADEMod Subsystem .....................................................................................57

4.5.2 [SENSe:]ADEMod:AM Subsystem ..............................................................................66

4.5.3 [SENSe:]ADEMod:FM Subsystem ...............................................................................75

4.5.4 [SENSe:]ADEMod:MCPHase Subsystem ...................................................................81

4.5.5 [SENSe:]ADEMod:PM Subsystem ..............................................................................82

4.5.6 [SENSe:]ADEMod:SPECtrum Subsystem ..................................................................87

4.5.7 [SENSe:]BANDwidth Subsystem .................................................................................94

4.5.8 [SENSe:]FILTer Subsystem ........................................................................................96

4.5.9 [SENSe:]FREQuency Subsystem ..............................................................................100

4.6 TRACe Subsystem ...................................................................................................100

4.7 TRIGger Subsystem ................................................................................................102

4.8 UNIT Subsystem ......................................................................................................106

4.9 Table of Softkeys and Hotkeys including Assignment of Remote-Control

Commands ...............................................................................................................107

4.9.1 FM Demodulator Main Menu .....................................................................................107

4.9.2 FREQ Key ..................................................................................................................110

4.9.3 SPAN Key ..................................................................................................................110

4.9.4 AMPT Key ..................................................................................................................111

4.9.5 BW Key ......................................................................................................................112

Software Manual 1141.1821.42 - 07 I-2

R&S FS-K7 Table of Contents

4.9.6 TRIG Key ...................................................................................................................112

4.9.7 MKR Key ....................................................................................................................112

4.9.8 MKR  Key ...............................................................................................................113

4.9.9 MKR FCTN Key .........................................................................................................113

Index ................................................................................................ 114

Software Manual 1141.1821.42 - 07 I-3

R&S FS-K7 Introduction

I Memory

128 k

Processor

Analog

IF filter

Bandwidths

300 kHz

1 MHz
3 MHz

10 MHz

Analyzer IF

20.4 MHz

A

D

A/D

converter

32 MHz

sampling

clock

Digital down conversion

+ decimation

cos

sin

decimation

filters

NCO

20.4 MHz

Q Memory

128 k

sampling rate

32 MHz / 2

n

n = 0 ... 11

Data aquisition hardware

I data

Q data

Trigger

1 Introduction

The following chapters describe the new operating functions of the FM demodulator
option for Spectrum Analyzer R&S FSP. In the case of functions identical to those of
the base unit, reference is made to the relevant chapter in the base unit manual.
The following chapters describe the new operating functions of the FM demodulator
option for Spectrum Analyzer R&S FSP and R&S FSU. In the case of functions
identical to those of the basic unit, reference is made to the relevant chapter in the
basic unit manual.
The digital signal processing in R&S FSP, used in the analyzer mode for digital IF
filters, is also ideally suited for demodulating FM or AM signals.
The digital signal processing in R&S FSP and R&S FSU, used in the analyzer mode for
digital IF filters, is also ideally suited for demodulating FM or AM signals.
By sampling (digitization) already at the IF and digital downconversion to the baseband
(I/Q), the demodulator achieves maximum accuracy and temperature stability. There is
no evidence of typical errors of an analog downconversion and demodulation like AM
 FM conversion, deviation error, frequency response or frequency drift at
DC coupling. Only the characteristics of the analog IF filter ahead of the A/D converter
need to be taken into consideration.

1.1 Circuit Description - Block Diagrams

Fig.1 shows the analyzer’s hardware from the IF to the processor. The IF filter is the
resolution filter of the spectrum analyzer, with a bandwidth range from 300 kHz to
10 MHz. The A/D converter samples the IF (20.4 MHz) at 32 MHz.
Lowpass filtering and reduction of the sampling rate follow the downconversion to the
complex baseband. The decimation depends on the selected demodulation bandwidth.
The output sampling rate is set in powers of 2 between 15.625 kHz and 32 MHz.
Useless oversampling at narrow bandwidths is avoided, saving computing time and
increasing the maximum recording time.
The I/Q data is stored in memories each comprising 128 k words. The hardware
triggering (external, IF power) controls the memory.
The I/Q data are stored in memories each comprising 512 k words. The hardware
triggering (external, IF power) controls the memory.

Fig.1 Block diagram of analyzer signal processing

Software Manual 1141.1821.42 - 07 1

R&S FS-K7 Introduction

Software demodulator

Counter

modulation

frequency

RF power
trace

carrier
power

lowpass

Inter-

polation

Q data

FFT

RF spectrum

trace

I2 + Q

2

AM demodulator

amplitude

arctan(Q / I)

d / dt

phase

frequency

FM demodulator

I data

Trace

Detector

Trace

Arithmetic

Trace

Arithmetic

PM

Detectors

&

Counter

+ peak

rms

- peak

1/2 pk-pk

arctan(Q / I)

phase

PM demodulator

Inter-

polation

Trace

Arithmetic

modulation

frequency

lowpass

Trace

Detector

PM trace

AC Coupling

Frequency

offset

AC Coupling
Phase Offset

FM

Detectors

&

Counter

+ peak

rms

- peak

1/2 pk-pk

Inter-

polation

Trace

Arithmetic

modulation

frequency

lowpass

Trace

Detector

FM trace

AC Coupling

Freq Offset

carrier

frequency

offset

phase

offset

FFT

AF spectrum

trace

Trace

Arithmetic

AF trigger

frequency
calculation

modulation

frequency

AM

Detectors

&

Counter

+ peak

rms

- peak

1/2 pk-pk

Inter-

polation

Trace

Arithmetic

modulation

frequency

Trace

Detector

AM trace

modulation

depth

lowpass

+

-

/

The software demodulator runs on the main processor of the analyzer. The
demodulation process is shown in Fig.2. All calculations are performed simultaneously
with the same I/Q data set. Magnitude (= amplitude) and phase of the complex I/Q
pairs are determined. The frequency result is obtained from the differential phase.

Fig.2 Block diagram of software demodulator

Software Manual 1141.1821.42 - 07 2

R&S FS-K7 Introduction

The AM-DC, PM-DC and FM-DC raw data of the demodulators is fed into the trace
arithmetic block that combines consecutive data sets. Possible functions are: Clear

Write, Max Hold, Min Hold and Average. The output data of the trace arithmetic can be
read via GPIB. The recording length corresponds to the selected sampling rate of 1 to
128 k samples.

The recording length corresponds to the selected sampling rate of 1 to 512 k samples.
501 samples are required for on-screen display. If less data is recorded, the missing

intermediate values are calculated by an interpolation filter.
If more than 501 samples are recorded, the interpolator becomes ineffective. In this

case the trace detector reduces the number of samples to 501.
501 samples (R&S FSU: 625 samples) are required for on-screen display. If less data

are recorded, the missing intermediate values are calculated by an interpolation filter.
If more than 501 (R&S FSU: 625) samples are recorded, the interpolator becomes

ineffective. In this case the trace detector reduces the number of samples to 501
(R&S FSU: 625).

The trace detector combines several samples according to the functions selectable:
Sample, Max Peak, Min Peak, Average, Autopeak, RMS. The zoom function does not
combine any samples, but selects a sequence of 501 samples from the data set.The
trace detector combines several samples according to the functions selectable:
Sample, Max Peak, Min Peak, Average, Autopeak, RMS. The zoom function does not
combine any samples, but selects a sequence of 501 (R&S FSU: 625) samples from
the data set.

The data from the trace detector is displayed on the screen and can be read out via
GPIB. They display level, phase versus time and/or frequency versus time.

In addition, important parameters are calculated:

● A counter determines the modulation frequency for AM, PM and FM.

● A lowpass filter suppresses the modulation frequency; the result is the average

power = carrier power with AM and the average frequency = carrier frequency
offset with FM. The deviation from the selected center frequency is displayed.

● AC coupling is possible with FM and PM display. To this end, the carrier frequency

offset is subtracted from the FM DC data. In addition, the frequency deviation is
determined from the trace data. +Peak, -Peak, ½ Peak-Peak and RMS are
displayed.

Besides the demodulators, the spectrum of the I/Q data, the FM, the PM or the AM is
calculated using FFT. The spectrum always comprises 501 samples.

Besides the demodulators, the spectrum of the I/Q data is calculated using FFT. The
spectrum always comprises 501 (FSU: 625) samples.

Software Manual 1141.1821.42 - 07 3

R&S FS-K7 Introduction

IF bandwidths  3 MHz ensure sufficient image-frequency rejection.
If due to a wide signal bandwidth an IF bandwidth of 10 MHz has to be selected,

signals are not allowed to be in the range from 6 MHz to 9 MHz above the receive
frequency because they will be convoluted back into the useful band of 10 MHz.

If the center frequency of the analyzer is not set exactly to the signal frequency, the
demodulation bandwidth must be selected larger by the carrier offset, in addition to the
requirement described above. This also applies if FM or PM AC coupling has been
selected.

Residual FM at RF <= 1 GHz

1

10

100

1000

10000

12,5 25 50 100 200 400 800 1600 2800 5000 10000

Demodulation bandwidth / kHz

Residual FM / Hz (RMS)

1.2 Further Characteristics

1.2.1 IF Bandwidth

The analog IF filter improves the selectivity, but also causes signal distortions. The
filter is negligible if:

IF bandwidth  10 x (modulation frequency + frequency deviation)

1.2.2 Demodulation Bandwidth

Digital filters determine the demodulation bandwidth. This is not the 3 dB bandwidth

but the useful bandwidth which is distortion-free with regard to phase and amplitude.
Therefore the following formulas apply:

● AM: demodulation bandwidth  2 x modulation frequency

● FM: demodulation bandwidth  2 x (frequency deviation + modulation frequency)

● PM: demodulation bandwidth  2  modulation frequency  (1 + phase deviation)

In general, the demodulation bandwidth should be as narrow as possible to improve
the S/N ratio. The residual FM caused by noise floor and phase noise increases
dramatically with the bandwidth, especially with FM ( REF _Ref305574188 \h Fig. 3).

Software Manual 1141.1821.42 - 07 4

Fig. 3 Residual FM as a function of demodulation bandwidth

R&S FS-K7 Introduction

1.2.3 AF Trigger

The FM demodulator option allows triggering to the demodulated signal. The display is
stable if a minimum of five modulation periods are within the recording time.

In the AM and FM display, triggering is always DC-coupled. In the PM display,
triggering is either AC- or DC-coupled, depending on the type of coupling set.
Therefore triggering is possible directly to the point where a specific carrier level,
phase or frequency is exceeded or not attained. This is particularly helpful when
measuring transients if no external trigger signal is available.

1.2.4 Stability of Measurement Results

Despite amplitude and frequency modulation, the display of carrier power and carrier
frequency offset is stable.

This is achieved by a digital filter which sufficiently suppresses the modulation,
provided, however, that the measurement time is  3 x 1 / modulation frequency, i.e.
that at least three periods of the AF signal are recorded.

The mean carrier power for calculating the AM is also calculated with a digital filter that
returns stable results after a measurement time of  3
at least three cycles of the AF signal must be recorded before a stable AM can be
show.

1 / modulation frequency, i.e.

*

Software Manual 1141.1821.42 - 07 5

R&S FS-K7 Settings of the FM Demodulator

FM DEMOD ON / OFF

AF FILTER

RESULT DISPLAY

RANGE

DEMOD BW

MEAS TIME

ZOOM

The softkeys visible in the RANGE submenu depend on the selected measurement
function (FM / PM / RF SPECTRUM / AF SPECTRUM).

2 Settings of the FM Demodulator

The FM DEMOD hotkey opens the menu for setting the FM demodulator functions.
Simultaneously, the FM demodulator is activated.

2.1 FM Demodulator Main Menu

Software Manual 1141.1821.42 - 07 6

R&S FS-K7 Settings of the FM Demodulator

Demodulation bandwidth

Sampling rate

Comment

120 MHz

256 MHz

with R&S FSQ-B72 only

50/85 MHz

(1)

128 MHz

with R&S FSQ-B72 only

30 MHz

64 MHz

with R&S FSQ only

18 MHz

32 MHz

with R&S FSQ only

10 MHz

32 MHz

8 MHz

16 MHz

This restriction only applies to R&S FSP and R&S
FSU without B72:
This filter is only flat for about 6 MHz, it has a 3 dB
decay at 7 MHz.

5 MHz

8 MHz

FM DEMOD ON / OFF

The FM DEMOD ON / OFF softkey switches the FM demodulator on or off. The FM
demodulator default setting is OFF; however, when the FM DEMOD mode is selected,
the demodulator is switched on automatically.

Note:
The resolution bandwidth, video bandwidth and sweep time active before the

demodulator is switched on are restored when the demodulator is switched off.
Similarly, the trace operating mode and detector are restored (the FM demodulator
has separate trace settings).

Remote: INST:SEL ADEM
INST:NSEL 3

AF FILTER

The AF FILTER softkey opens the submenu for selecting high pass or low pass filters
and also a de-emphasis. (see chapter "Selection of Filter – AF FILTER Menu").

RESULT DISPLAY

The RESULT DISPLAY softkey opens the submenu for selecting the measurement
function required (see chapter "Selection of Display Mode - RESULT DISPLAY
Menu").

RANGE

The RANGE softkey opens the submenu for setting the display range of the
measurement function selected (see chapter "Scaling of Measurement Results ­RANGE Menu").

DEMOD BW

The DEMOD BW softkey selects the demodulation bandwidth of the FM demodulator.
The demodulation bandwidth determines the sampling rate for recording the signal to
be analyzed.
The following table shows the relation between demodulation bandwidth and sampling rate:

Software Manual 1141.1821.42 - 07 7

R&S FS-K7 Settings of the FM Demodulator

Demodulation bandwidth

Sampling rate

Comment

3 MHz

4 MHz

1.6 MHz

2 MHz

800 kHz

1 MHz

400 kHz

500 kHz

200 kHz

250 kHz

100 kHz

125 kHz

50 kHz

62.5 kHz

25 kHz

31.25 kHz

12.5 kHz

15.625 kHz

6.4 kHz

7.8125 kHz

3.2 kHz

3.90625 kHz

1.6 kHz

1.953125 kHz

800 Hz

976.5625 Hz

400 Hz

488.28125 Hz

200 Hz

244.140625 Hz

100 Hz

122.0703125 Hz

Demodulation
bandwidth

Min. measurement
time

Max. measurement
time with AF trigger

Max. measurement
time with other trigger

120 MHz

3.90625 ns

425 s

510 s

50 / 85 MHz

7.8125 ns

850 s

1.0 ms

30 MHz

15.625 ns

1.7 ms

2.0 ms

18 MHz

31.25 ns

3.4 ms

4.1 ms

10 MHz

31.25 ns

3.4 ms

4.1 ms

8 MHz

62.5 ns

6.8 ms

8.2 ms

5 MHz

125 ns

13.6 ms

16.3 ms

3 MHz

250 ns

27.2 ms

32.6 ms

1.6 MHz

500 ns

54.4 ms

65.3 ms

1) The demodulation bandwidth at a sampling rate of 128 MHz depends on the
center frequency that has been set. At a center frequency of ≤3.6 GHz, the
demodulation bandwidth is 50 MHz; at higher center frequencies, it is 85 MHz.

Remote: SENS:BAND:DEM 10MHz

MEAS TIME

The MEAS TIME softkey opens an editor for entering the measurement time of the FM
demodulator. The permissible value range depends on the demodulation bandwidth
selected.

Software Manual 1141.1821.42 - 07 8

R&S FS-K7 Settings of the FM Demodulator

Demodulation
bandwidth

Min. measurement
time

Max. measurement
time with AF trigger

Max. measurement
time with other trigger

800 kHz

1 s

109 ms

131 ms

400 kHz

2 s

218 ms

261 ms

200 kHz

4 s

435 ms

522 ms

100 kHz

8 s

870 ms

1.04 s

50 kHz

16 s

1.74 s

2.09 s

5 kHz

32 s

3.48 s

4.18 s

12.5 kHz

64 s

6.96 s

8.36 s

6.4 kHz

128 s

13.9 s

16.7 s

3.2 kHz

256 s

27.8 s

33.4 s

1.6 kHz

512 s

55.7 s

66.8 s

800 Hz

1.024 ms

111 s

133 s

400 Hz

2.048 ms

222 s

267 s

200 Hz

4.096 ms

445 s

534 s

100 Hz

8.192 ms

891 s

1069 s

HIGH PASS AF FILTER

LOW PASS AF FILTER

DEEMPHASIS

WEIGHTING AF FILTER

Remote: SENS:ADEM:MTIM 62.5US

SENS:SWE:TIME 62.5US

ZOOM

In many cases, the number of recorded test points exceeds by far the number of
available pixels. Therefore several test points are combined to one pixel if the ZOOM
function is inactive.
If the ZOOM function is activated, a 1-to-1 allocation is selected, i.e. each pixel
corresponds to a recorded test point. The start of the zoom window can be determined
in the associated field by entering the time.
The zoom function is not available if the number of test points falls below the number
of pixels in the diagram (R&S FSP:501,R&S FSU/FSQ: 625).

Remote: SENS:ADEM:ZOOM ON SENS:ADEM:ZOOM:STARt 30US

2.1.1 Selection of Filter and Deemphasis – AF FILTER Menu

AF FILTER

The AF FILTER softkey opens the submenu for selecting high pass or low pass filters
and also a de-emphasis.

Software Manual 1141.1821.42 - 07 9

R&S FS-K7 Settings of the FM Demodulator

HIGH PASS AF FILTER

The HIGH PASS AF FILTER softkey opens the submenu for selecting the high pass
filter.

The 20 Hz, 50 HZ and 300 HZ softkeys switch on a high pass filter with the given limit
to separate the DC component. The filters are indicated by the 3 dB cutoff frequency.
The filters are designed as 2nd-order Butterworth filter (12 dB/octave).

The NONE softkey deactivates the AF high pass filter. Default is NONE.
The R&S FSP requires the option R&S FSP-B70 for the high pass filter.
The high pass filter are active in the following demodulation bandwidth range:
20 Hz 100 Hz ≤ demodulation bandwidth ≤ 1.6 MHz
50 Hz 200 Hz ≤ demodulation bandwidth ≤ 4 MHz
300 Hz 800 Hz ≤ demodulation bandwidth ≤ 16 MHz

Remote: SENS:FILT:HPAS:STAT ON | OFF
SENS:FILT:HPAS:FREQ 20 Hz | 50 Hz |300 Hz

LOW PASS AF FILTER

The LOW PASS AF FILTER softkey opens the submenu for selecting the
low pass filter.

The 3 KHZ, 15 KHZ; 23 KHZ and 150 KHZ softkeys switch on a absolute low pass
filter. The filter are indicated by the 3 dB cutoff frequency. The 3 kHz and 15 kHz filters
are designed as 5th-order Butterworth filter (30 dB/octave). The 150 kHz filter is
designed as 8th-order Butterworth filter (48 dB/octave).

The 5 %, 10% and 25% HZ softkeys switch on a relative low pass filter. The filter (3
dB) can be selected in % of the demodulation bandwidth. The filters are designed as
5th-order Butterworth filter (30 dB/octave).

The NONE softkey deactivates the AF low pass filter. Default is NONE.
The R&S FSP requires the option R&S FSP-B70 for the absolute low pass filter 3 kHz,

15 kHz and 150 kHz. The relative low pass filters are always available.

The relative low pass filters are active for all demodulation bandwidth’s. The absolute

low pass filters are active in the following demodulation bandwidth range:
3 kHz 6.4 kHz ≤demodulationbandwidth ≤ 4 MHz
15 kHz 50 kHz ≤demodulationbandwidth ≤ 16 MHz
23 Hz 50 Hz ≤demodulationbandwidth ≤ 8 MHz
150 kHz 400 kHz ≤demodulation bandwidth ≤ 16 MHz

Remote: SENS:FILT:LPAS:STAT ON | OFF
SENS:FILT:LPAS:FREQu:REL 5 | 10 | 25
SENS:FILT:LPAS:FREQ 3 kHz | 15 kHz | 23kHz | 150 kHz

Software Manual 1141.1821.42 - 07 10

R&S FS-K7 Settings of the FM Demodulator

Deemphasis

25 µs

50 µs

75 µs

750 µs
Maximum
AF Frequency

25 kHz

12 kHz

8 kHz

800 Hz
Required

demodulation
bandwidth

 200 kHz

 100 kHz

 50 kHz

 6.4 kHz

NONE

CCITT

CCIR UNWEIGHTED

CCIR WEIGHTED

A WEIGHTED

DEEMPHASIS

The DEEMPHASIS softkey opens the submenu for selecting the deemphasis.
The 25 us, 50 us, 75 us and 750 us softkeys switch on a de-emphasis with the given

time constant.
The NONE softkey deactivates the de-emphasis. Default is NONE.
The R&S FSP requires the option R&S FSP-B70 for the de-emphasis.
The de-emphasis is active in the following demodulation bandwidth range:
25 µs 25 kHz ≤ demodulation bandwidth ≤ 30 MHz
50 µs 6.4 kHz ≤ demodulation bandwidth ≤ 18 MHz
75 µs 6.4 kHz ≤ demodulation bandwidth ≤ 18 MHz
750µs 800 Hz ≤ demodulation bandwidth ≤ 4 MHz
The following table shows the required demodulation bandwidth for an error less than

0.5 dB up to a maximum AF frequency.

For higher AF frequencies the demodulation bandwidth must be increased.

Remote: SENS:FILT:DEMP:STAT ON | OFF
SENS:FILT:DEMP:TCON 25 us | 50 us | 75 us | 750 us

WEIGHTING AF FILTER

The WEIGHTING AF FILTER softkey opens the submenu for selecting the weighting
filter.

NONE

The NONE softkey deactivates the weighting filter. This is the default setting.
Remote: ---

CCITT

The CCITT softkey switches on a CCIT P.53 weighting filter. The weighting filter is
active in the following demodulation bandwidth range:

Software Manual 1141.1821.42 - 07 11

20 kHz ≤ demodulation bandwidth ≤ 3 MHz
Remote: SENS:FILT:CCIT:STAT ON | OFF

R&S FS-K7 Settings of the FM Demodulator

FM

PM

AM

RF POWER

RF SPECTRUM

AF SPECTRUM

SELECT TRACE

FULL SIZE DIAGRAM

CCIR UNWEIGHTED

The CCIR UNWEIGHTED softkey switches on the CCIR unweighted filter, which is the
combination of the 20 Hz highpass and 23 kHz low pass filter. The weighting filter is
active in the following demodulation bandwidth range:

50 kHz ≤ demodulation bandwidth ≤ 1.6 MHz

Remote: SENS:FILT:CCIR:UNW:STAT ON | OFF

CCIR WEIGHTED

The CCIR WEIGHTED softkey switches on the CCIR weighted The weighting filter is
active in the following demodulation bandwidth range:

100 kHz ≤ demodulation bandwidth ≤ 3 MHz

Remote: SENS:FILT:CCIR:WEIG:STAT ON | OFF

A WEIGHTED

The A WEIGHTED softkey switches on the A weighted filter. The weighting filter is
active in the following demodulation bandwidth range:

100 kHz ≤ demodulation bandwidth ≤ 800 kHz

Remote: SENS:FILT:AWE:STAT ON | OFF

2.1.2 Selection of Display Mode – RESULT DISPLAY Menu

In order to display the measurement results the screen is divided in two halves:
In the upper half, the measurement results are displayed as a trace, in the lower half
the results of additional evaluation functions are shown. The RESULT DISPLAY
softkey allows the user to select the measurement results to be displayed.

RESULT DISPLAY

The RESULT DISPLAY softkey opens a submenu for selecting the measurement
result to be displayed.
The demodulated FM, PM or AM signal, the RF signal in the time domain or the RF or
AF frequency spectrum determined via FFT can be selected for display.
All displays are determined from the I/Q data set recorded for the measurement. In
SINGLE SWEEP mode, the single data set recorded can be evaluated in all displays
simply by switching the result display.

Software Manual 1141.1821.42 - 07 12

R&S FS-K7 Settings of the FM Demodulator

FM

The FM softkey selects the demodulated FM signal for display. Depending on the AF
COUPLING AC/DC selection in the RANGE menu, the average value of the

demodulated signal is mapped onto the vertical center of the diagram (AC selected) or
deviates from the center of the diagram by a signal-dependent frequency offset (DC
selected).

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to FM does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:FM'

PM

The PM softkey selects the display of the demodulated PM signal.

Software Manual 1141.1821.42 - 07 13

R&S FS-K7 Settings of the FM Demodulator

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to PM does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:PM'

AM

The AM softkey selects the display of the demodulated AM signal.

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to AM does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:AM:REL'

RF POWER

The RF POWER softkey selects the display of the RF signal in the time domain. In
contrast to normal analyzer operation, the level values are determined from the
recorded I/Q data set by means of summation.

Software Manual 1141.1821.42 - 07 14

R&S FS-K7 Settings of the FM Demodulator

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to RF POWER does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:RFP'

RF SPECTRUM

The RF SPECTRUM softkey selects the RF signal in the frequency domain for display.
In contrast to normal spectrum analyzer operation, the measured values are
determined using FFT from the recorded I/Q data set.

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to SPECTRUM does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:SPECTRUM'

Software Manual 1141.1821.42 - 07 15

R&S FS-K7 Settings of the FM Demodulator

AF SPECTRUM

The AF SPECTRUM softkey selects the display of the AF spectrum. The AF spectrum
can be calculated from the FM signal, PM signal or the RF signal in the time domain.

The softkey is not available if the RF spectrum display is selected.

In SINGLE SWEEP mode, the data is determined from the current I/Q data set, i.e. a
change to AF SPECTRUM does not trigger a new measurement.

Remote: CALC:FEED 'XTIM:FM:AFSP'
CALC:FEED 'XTIM:PM:AFSP'
CALC:FEED 'XTIM:AM:AFSP'
CALC:FEED 'XTIM:RFP:AFSP'

SELECT TRACE

The SELECT TRACE softkey selects the trace, the data of which is to be displayed in
the lower half of the screen.

Remote: --

FULL SIZE DIAGRAM

The FULL SIZE DIAGRAM switches the diagram to full screen size.

Remote: DISP:SIZE LARG

Software Manual 1141.1821.42 - 07 16

R&S FS-K7 Settings of the FM Demodulator

RANGE

DEVIATION

PER DIV

REFERENCE

POSITION

REFERENCE

VALUE

AF COUP

AC DC

DEVIATION

LIN LOG

DB

PER DIV

RF POWER

PER DIV

MAX DISP

RF POWER

RANGE
LINEAR

RANGE

LOG MANUAL

RANGE

LINEAR %

RANGE

LINEAR dB

FM
FM AF Spectrum
PM
PM AF Spectrum
AM
AM AF Spectrum

RF Power
RF Power AF Spectrum
RF Spectrum

Result Display:

PM UNIT

RAD DEG

UNIT

PHASE WRAP

ON OFF

ZERO PHASE

REF POS

THD UNIT

% DB

2.1.3 Scaling of Measurement Results – RANGE Menu

RANGE

The RANGE softkey opens a submenu for determining the diagram scaling for the
selected measurement.

The softkeys visible depend on the selected measurement function (FM / RF POWER
/PM / RF SPECTRUM):

2.1.4 Scaling Functions for FM, PM and AM Result Display

DEVIATION PER DIV

The DEVIATION PER DIV softkey allows the phase or frequency deviation to be
displayed in the range 1 Hz/div to 1 MHz/div with the FM display and in the range

0.0001 rad/div to 1000 rad/div with the PM display.
To prevent corruption of the measurement results, the IF bandwidth of the analyzer

must be larger than the maximum frequency deviation plus modulation frequency (IF
BANDWIDTH softkey in the FM DEMOD menu).

The softkey is not available in the AF spectrum display of the FM or PM signal, as
scaling in this case is performed via the DB PER DIV and REFERENCE VALUE

Software Manual 1141.1821.42 - 07 17

softkeys.

Remote: DISP:WIND:TRAC:Y:PDIV 50kHz

REFERENCE POSITION

The REFERENCE POSITION softkey determines the position of the reference line for
the phase or frequency deviation on the y axis of the diagram. In the default setting of
the analyzer, this line corresponds to a frequency deviation of 0 Hz for the display of
the FM signal or to a phase deviation of 0 rad for the display of the PM signal.

R&S FS-K7 Settings of the FM Demodulator

The position is entered as a percentage of the diagram height with 100 %
corresponding to the upper diagram border. The default setting is 50 % (diagram
center) for the display of the PM or FM signal and 100% (upper diagram border) for the
AF spectrum display of the PM or FM signal.

Remote: DISP:WIND:TRAC:Y:RPOS 50PCT

REFERENCE VALUE

The REFERENCE VALUE softkey determines the frequency or phase deviation at the
reference line of the y axis. The reference value is set separately for each display of
the PM and FM signal and the AF spectrum of the PM and FM signal.

FM signal display:

The reference value makes it possible to take individual frequency offsets into account
in the trace display (in contrast, the AF COUP AC/DC softkey permits automatic
correction by the average frequency offset of the signal).
Values between 0 and  10 MHz can be selected. The softkey is not available if the AF
COUP AC function has been activated.

AF spectrum display of the FM signal:

In the default setting, the reference value defines the FM deviation at the upper
diagram border.
Values between 0 and 10 MHz can be selected.

PM signal display:

The reference value makes it possible to take individual phase offsets into account in
the trace display (in contrast, the AF COUP AC/DC softkey permits automatic
correction by the average phase offset of the signal).
Values between 0 and  10000 rad can be selected. The softkey is not available if the
AF COUP AC function has been activated.

AF spectrum display of the PM signal:

In the default setting, the reference value defines the PM deviation at the upper
diagram border.
Values between 0 and 10000 rad can be selected.

Remote: DISP:WIND:TRAC:Y:RVAL 0 HZ

AF COUP AC/DC

The AF COUP AC/DC softkey controls the automatic correction of the frequency offset
and phase offset of the input signal:

FM signal display:

● If DC is selected, the absolute frequency is displayed, i.e. an input signal with an

offset relative to the center frequency is not displayed symmetrically with respect to
the zero line.

Software Manual 1141.1821.42 - 07 18

R&S FS-K7 Settings of the FM Demodulator

ON

The phase will be displayed in the range ±180° (±π). For example, if the phase

exceeds +180°, 360° is subtracted from the phase value, with the display thus
showing >-180°.

OFF

The phase will not be wrapped.

● If AC is selected, the frequency offset is automatically corrected, i.e. the trace is

always symmetric with respect to the zero line.

PM signal display:

● If DC is selected, the phase runs according to the existing frequency offset. In

addition, the DC signal contains a phase offset of ±π.

● If AC is selected, the frequency offset and phase offset are automatically corrected,

i.e. the trace is always symmetric with respect to the zero line.

The softkey is not available with the AF spectrum display of the FM or PM signal.

Remote: SENS:ADEM:AF:COUP DC

ZERO PHASE REF POS

The ZERO PHASE REF POS softkey defines the position at which the phase of the
PM-demodulated signal is set to 0 rad. The entry is made with respect to time. In the
default setting, the first measured value is set to 0 rad.
This softkey is available only in the PM display with DC coupling.

Remote: SENS:ADEM:PM:RPO:X 10us

DEVIATION LIN/LOG

The DEVIATION LIN/LOG softkey switches between logarithmic and linear display of
the frequency deviation or phase deviation or modulation depth (AM).
The softkey is only available in the AF spectrum deviation of the FM or PM or AM signal.

Remote: DISP:WIND:TRAC:Y:SPAC LOG

DB PER DIV

The DB PER DIV softkey makes it possible to select the FM or PM deviation or
modulation depth to be displayed in the range 0.1 dB/div to 20 dB/div.
The softkey is not available if linear display is set.

Remote: DISP:WIND:TRAC:Y:PDIV 5DB

PHASE WRAP ON/OFF

The PHASE WRAP ON/OFF softkey activates/deactivates phase wrap.

This softkey in available in the PM signal displays.

Remote: CALC:FORM PHAS | UPH

UNIT

The UNIT softkey opens the submenu for selecting units.

Software Manual 1141.1821.42 - 07 19

R&S FS-K7 Settings of the FM Demodulator

PM UNIT RAD/DEG

The PM UNIT RAD/DEG softkey is used to select the unit for displaying PM signals.

Remote: UNIT:ANGL RAD

THD UNIT %/DB

The THD UNIT %/DB softkey selects between % and dB for displaying the THD
measurement result.

Remote: UNIT:THD PCT | DB

FUND FREQ MANUAL / FUND FREQ AUTO

The FUND FREQ MANUAL / FUND FREQ AUTO softkeys switches between
automatic or manual selection of the fundamental frequency used for the SINAD and
THD calculations. With automatic selection the peak in the AF spectrum is used as the
fundamental frequency.

When switching from AUTO to MANUAL the current modulation frequency result is
used as a default if the measurement result is available at this time.

These softkeys are available, if result AF SPECTRUM is switched on.

Remote: CALC:ADEM:THD:FREQ:FUND:AUTO ON | OFF

CALC:ADEM:THD:FREQ:FUND:VALue <numeric value>

2.1.5 Scaling Functions for Result Displays with Level Display

MAX DISP RF POWER

The MAX DISP RF POWER determines the maximum RF power to be displayed. The
selected value affects only the display. The reference level determines the dynamic

range limit of the analyzer’s A/D converter. If the input signal exceeds the selected

reference level, the measurement results are impaired by A/D converter overloading. If
a value higher than the reference level is selected for MAX DISP RF POWER, the
dynamic range limit (= reference level) is highlighted by a red line on the screen:

 POS x dBm 

Remote: DISP:WIND:TRAC:Y:RVAL 10 DBM

RF POWER LOG/LIN

The RF POWER LOG/LIN
softkey allows the user to select logarithmic or linear level display.

Remote: DISP:WIND:TRAC:Y:SPAC LOG

RF POWER PER DIV

The RF POWER PER DIV softkey determines the RELATIVE power between two
divisions on the y axis of the diagram.

Remote: DISP:WIND:TRAC:Y:PDIV 10 DB

Software Manual 1141.1821.42 - 07 20

R&S FS-K7 Settings of the FM Demodulator

Span <> 0 Sp an = 0

FRE

Q

CE NT E R

CF-

STEPSIZE

0 .1 * SPAN

0 .5 * SPAN

x * SPAN

= CEN TER

0 .1 * RBW

0 .5 * RBW

x * RBW

= CEN TER

MANUA L

MANU A L

AF CENTER

AF START

AF STOP

SINGLE

AUTOTUNE

RANGE LINEAR

The RANGE LINEAR softkey is identical to the softkey of the base unit.

RANGE LINEAR

The RANGE LINEAR softkey is identical to the softkey of the base unit.

RANGE LINEAR %

The RANGE LINEAR % softkey is identical to the softkey of the base unit.

RANGE LINEAR dB

The RANGE LINEAR dB softkey is identical to the softkey of the base unit.

RANGE LOG MANUAL

The RANGE LOG MANUAL softkey is identical to the softkey of the base unit.

2.2 FREQ Key

The FREQ menu functions are identical to those of the base unit.
If the AF spectrum display is active, the AF CENTER, AF START and AF STOP

softkeys, with which the displayed frequency range is defined within the demodulation ­bandwidth, are also available.

Software Manual 1141.1821.42 - 07 21

R&S FS-K7 Settings of the FM Demodulator

AF Spectrum

RF Spectrum

AF SPAN

FREQUENCY SPAN

AF FULL SPAN

FULL SPAN

DEMOD BW

DEMOD BW

SINGLE AUTOTUNE

This softkey activates an automatic signal search.

Remote: SENS:FREQ:CW:AFC ONC

AF CENTER

The AF CENTER softkey allows the user to select the center frequency within the AF
spectrum.

Remote: SENS:ADEM:AF:CENT 1MHZ

AF START

The AF START softkey allows the user to select the start frequency within the AF
spectrum.

Remote: SENS:ADEM:AF:STAR 0HZ

AF STOP

The AF STOP softkey allows the user to select the stop frequency within the AF
spectrum.
The maximum AF stop frequency corresponds to half the demodulation bandwidth.

Remote: SENS:ADEM:AF:STOP 2MHZ

2.3 SPAN Key

The SPAN menu allows the user to select the frequency range to be displayed if the
spectrum displays of the FM demodulator are active.

AF SPAN

The AF SPAN softkey allows the user to select the frequency range if the AF spectrum
displays are active.
Values between the sampling rate/200 and the demodulation bandwidth/2 can be
selected.

Software Manual 1141.1821.42 - 07 22

Remote: SENS:ADEM:AF:SPAN 2.5 MHz

FREQUENCY SPAN

The FREQUENCY SPAN softkey allows the user to select the frequency range if the
RF SPECTRUM display is active.

Values between the sampling rate/200 and the demodulation bandwidth/2 can be selected.

Remote: SENS:ADEM:SPEC:SPAN:ZOOM 5 MHz

R&S FS-K7 Settings of the FM Demodulator

AF FULL SPAN

The AF FULL SPAN softkey sets the maximum frequency range if the AF spectrum
displays are active.
The maximum frequency range corresponds to half the demodulation bandwidth.

Remote: SENS:ADEM:AF:SPAN:FULL

FULL SPAN

The FULL SPAN softkey sets the maximum frequency range if the RF spectrum
display is active.

The maximum frequency range corresponds to the demodulation bandwidth.

Remote: ADEM:SPEC:SPAN:ZOOM MAX

DEMOD BW

The demodulation bandwidth of the FM demodulator is selected with the DEMOD BW
softkey.

Note:
The function is identical to the function of the DEMOD BW softkey in the FM

DEMOD main menu.

Remote: SENS:BAND:DEM 10MHz

MEAS TIME

The MEAS TIME softkey opens the input field for the measurement time of the FM
demodulator.

Note:
The function is identical to the function of the MEAS TIME softkey in the FM

DEMOD main menu.

Remote: SENS:ADEM:MTIM 62.5US
SENS:SWE:TIME 62.5US

Software Manual 1141.1821.42 - 07 23

R&S FS-K7 Settings of the FM Demodulator

REF LEVEL

RF ATTEN

AUTO

RANGE

LOG 100 dB

RANGE

LINEAR

RANGE

LOG MANUAL

REF LEVEL

POSITION

REF LEVEL

OFFSET

RF ATTEN

MANUAL

RF INPUT

50W 75W

EL ATTEN

AUTO

EL ATTEN

MANUAL

EL ATTEN

OFF

Option

FSP-B25

Option

FSP-B25

Option

FSP-B25

AMPT

RANGE

LINEAR %

RANGE

LINEAR dB

The REF LEVEL value defines the clipping level of the A/D converter and must
therefore be set greater than or equal to the maximum power of the signal to be
analyzed.

RES BW

IF BW AUTO

IF BW MANUAL

DEMOD BW

MEAS TIME

2.4 AMPT Key

The AMPT menu functions are identical to those of the base unit.
The following functions are only available with level displays:

● RANGE LOG 100 dB

● RANGE LOG MANUAL

● RANGE LINEAR

2.5 BW Key

The BW menu comprises all functions relating to the band limiting of the analyzed
signal.

Software Manual 1141.1821.42 - 07 24

R&S FS-K7 Settings of the FM Demodulator

RES BW

If the Spectrum result display is active, the RES BW softkey selects the resolution
bandwidth for the signal displayed. Note that these resolution bandwidths are obtained
by means of FFT filters from 1 Hz to 10 MHz.

Note:
The softkey is available only if the RF SPECTRUM or AF SPECTRUM result
display is active.
The IF bandwidth is limited by analog LC filters using the IF BW MANUAL and IF
BW AUTO softkeys.

Remote: SENS:ADEM:SPEC:BAND:RES 10 kHz

IF BW AUTO

The IF BW AUTO softkey couples the IF bandwidth of the analyzer (i.e. the bandwidth
of the analog LC filters) to the selected demodulation bandwidth.

Remote: SENS:BAND:RES:AUTO ON

IF BW MANUAL

The IF BW MANUAL softkey allows the IF bandwidth of the analyzer to be entered (i.e. the
bandwidth of the analog filters). Bandwidths from 300 kHz to 10 MHz can be selected.

Remote:SENS:BAND:RES 1 MHz

Note:
Manual setting of the IF bandwidth is usually not required. If an IF bandwidth is set
that is narrower than the value defined by AUTO coupling,

- the RF frequency response is identical to that of the IF filter if the spectrum
display is active,

- an AF frequency response corresponding to a lowpass filter equivalent to the
IF filter occurs in the case of FM demodulation.

DEMOD BW

The demodulation bandwidth of the FM demodulator is selected via the DEMOD BW
softkey.

Note:
The function is identical to that of the DEMOD BW softkey in the FM DEMOD main menu.

Remote: SENS:BAND:DEM 10MHz

MEAS TIME

The MEAS TIME softkey opens the editor for entering the data-recording time of the
FM demodulator.

Note:
The function is identical to that of the MEAS TIME softkey in the FM DEMOD main
menu.

Remote: SENS:ADEM:MTIM 62.5US
SENS:SWE:TIME 62.5US

Software Manual 1141.1821.42 - 07 25

R&S FS-K7 Settings of the FM Demodulator

FREE RUN

DEMOD SIGNAL

FM SIGNAL

PM SIGNAL

AM SIGNAL

RF POWER SIGNAL

EXTERN

IF POWER

TRIGGER OFFSET

POLARITY POS/NEG

2.6 TRIG Key

The TRIG key opens a menu for setting the different trigger sources and for selecting
the trigger polarity. The active trigger mode is indicated by highlighting the associated
softkeys.

To indicate that a trigger mode other than FREE RUN has been set, the TRG
enhancement label is displayed on the screen. If two measurement windows are
displayed, TRG is indicated next to the window in question.

FREE RUN

The FREE RUN softkey activates the free-running sweep, i.e. the measurement start is
not triggered explicitly. When a measurement is completed, the next one starts
immediately. FREE RUN is the default setting.

Remote: TRIG:SOUR IMM

DEMOD SIGNAL

The DEMOD SIGNAL softkey opens the menu for selecting the various trigger
sources.

FM SIGNAL

With a modulated signal, the trigger source that is selected with the FM SIGNAL
softkey is the point at which a specific absolute phase is reached by the input signal.
The associated trigger threshold can be entered simultaneously.
Measurement is triggered if the selected threshold is exceeded. A periodic signal
modulated onto the carrier frequency can be displayed in this way.

Note:
For triggering with the FM SIGNAL trigger source to be successful, the

measurement time must cover at least five periods of the audio signal.
The triggering responds to the absolute frequency, i.e. it is always DC-coupled.

Software Manual 1141.1821.42 - 07 26

Remote: TRIG:SOUR FM
TRIG:LEV:FM 10 kHz

R&S FS-K7 Settings of the FM Demodulator

PM SIGNAL

With a modulated signal, the trigger source that is selected with the PM SIGNAL
softkey is the point at which a specific absolute frequency is reached. The associated
trigger threshold can be entered simultaneously.
Measurement is triggered if the selected threshold is exceeded. A periodic signal
modulated onto the carrier frequency can be displayed in this way.

Note:
For triggering with the PM SIGNAL trigger source to be successful, the

measurement time must cover at least five periods of the audio signal.
Triggering is either AC- or DC-coupled, depending on the AF COUPLING AC/DC
setting in the RANGE menu.

Remote: TRIG:SOUR PM

TRIG:LEV:PM 0.2 rad

AM SIGNAL

With a modulated signal, the trigger source that is selected with the AM SIGNAL
softkey is the point at which a specific modulation depth is reached. The associated
trigger threshold can be entered simultaneously.
Measurement is triggered if the selected threshold is exceeded. A periodic signal
modulated onto the carrier frequency can be displayed in this way.

Note:
For triggering with the AM SIGNAL trigger source to be successful, the

measurement time must cover at least five periods of the audio signal.

Remote: TRIG:SOUR AMR
TRIG:LEV:AM:REL 0.2 rad

RF POWER SIGNAL

With a modulated signal (AF signal), the trigger source that is selected with the RF
POWER SIGNAL softkey is the point at which a specific signal level is reached. The

associated trigger threshold can be entered simultaneously.
Measurement is triggered if the selected threshold is exceeded. A periodic signal
modulated onto the carrier frequency can be displayed in this way.

Note:
The RF POWER SIGNAL trigger differs from the RF POWER trigger in that the AF

signal is taken into account rather than the RF signal.
For triggering with the AM trigger source to be successful, the measurement time
must cover at least five periods of the audio signal.

Remote: TRIG:SOUR AM

TRIG:LEV:AM –30 dBm

EXTERN

The EXTERN softkey activates triggering by a TTL signal at the EXT TRIGGER/GATE
input connector on the rear panel.

Software Manual 1141.1821.42 - 07 27

R&S FS-K7 Settings of the FM Demodulator

eampGainRFAttMixerlevelSignalInputeampGainRFAttMixerlevel PrPr

maxmin



eampGainRFAttMixerlevelSignalInputeampGainRFAttMixerlevel PrPr

maxmin



Remote: TRIG:SOUR EXT
SWE:EGAT:SOUR EXT

IF POWER

The IF POWER softkey activates triggering of measurement by means of signals
outside the measurement channel.
To this end, the R&S FSP uses a level detector on the second intermediate frequency.
The threshold of the level detector can be selected between -30 dBm and -10 dBm at
the input mixer.
The R&S FSU also uses a level detector on the second intermediate frequency. The
threshold of the level detector can be selected between –50 dBm and
–10 dBm at the input mixer for R&S FSU.
This means that the input signal range within which the trigger responds can be
calculated as follows:

The bandwidth on the intermediate frequency is 10 MHz. The measurement is
triggered if the trigger threshold is exceeded by a signal in a range of 5 MHz around
the center frequency.
For R&S FSU the bandwidth on the intermediate frequency is 80 MHz, which means
that the measurement is triggered if the trigger threshold is exceeded in a range of 40
MHz around the center frequency.
This allows spurious signals to be measured, such as pulsed carriers, even if the
carrier itself is not within the display frequency range.

Remote: TRIG:SOUR IFP
SWE:EGAT:SOUR IF

RF POWER

The RF POWER softkey activates triggering of measurement by means of signals
outside the measurement channel.
To this end, the analyzer uses a level detector on the first intermediate frequency. The
threshold of the level detector can be selected between -50 dBm and -10 dBm at the
input mixer. This means that the input signal range within which the trigger responds
can be calculated as follows:

The bandwidth on the intermediate frequency is 80 MHz. The measurement is
triggered if the trigger threshold is exceeded by the set frequency in a 40 MHz range.
This allows spurious to be measured, such as pulsed carriers, even if the carrier itself
is not within the display frequency range.

Note:
The function is only available with option TV and RF Trigger R&S FSP-B6.

Remote: TRIG:SOUR RFP
SWE:EGAT:SOUR RFP

Software Manual 1141.1821.42 - 07 28

R&S FS-K7 Settings of the FM Demodulator

Demodulation
bandwidth

Min. trigger
offset

Max. trigger
offset

120 MHz

-126 ns

31.7ms

50 / 85 MHz

-253 ns

63.5 ms

30 MHz

-507 ns

126.9 ms

18 MHz

-1 ms

253.9 ms

10 MHz

-2 ms

507.9 ms

8 MHz

-4.1 ms

1015.8 ms

5 MHz

-8.1 ms

2031.6 ms

3 MHz

-16.3 ms

4064.1 ms

1.6 MHz

-32.5 ms

8126.2 ms

800 kHz

-65 ms

16.2524 s

400 kHz

-130 ms

32.5048 s

200 kHz

-260.1 ms

65.0097 s

100 kHz

-520.2 ms

130.0193 s

50 kHz

-1040.4 ms

260.0386 s

25 kHz

-2080.7 ms

520.0773 s

12.5 kHz

-4151.5 ms

1040.1546 s

6.4 kHz

-8.322 s

2080.3 s

3.2 kHz

-16.64 s

4160.6 s

1:6 kHz

-33.29 s

8321.2 s

800 Hz

-66.58 s

16642 s

400 Hz

-133.1s

33284 s

200 Hz

-266.3 s

66569 s

100 Hz

-532.6 s

133139 s

TRIGGER OFFSET

The TRIGGER OFFSET softkey allows the user to enter a time offset between the
trigger signal and the beginning of the measurement.
Triggering is delayed (entry value >0) or advanced (entry value <0) by the time entered.
The permissible setting range depends on the demodulation bandwidth and is given in
the following table:

Remote: TRIG:HOLD 10US

POLARITY POS/NEG

The POLARITY POS/NEG softkey determines the trigger slope polarity.
The measurement sequence starts upon a positive or negative slope of the trigger
signal. The valid setting is highlighted.
The setting is valid for all trigger modes except FREE RUN.
The default setting is POLARITY POS.

Software Manual 1141.1821.42 - 07 29

R&S FS-K7 Settings of the FM Demodulator

ALL MARKER
OFF

MARKER 4

MARKER

NORM DELTA

MARKER 3

MARKER 2

MARKER 1

MKR

Note:
The function is available only for detector boards with model index  3. Previous
boards ignore the setting.

Remote: TRIG:SLOP POS

2.7 MKR Key

The MKR menu functions are identical to those of the base unit.
Only the measurement result display is coupled to the active result display and is in Hz

if FM and FM AF spectrum are selected, in rad if PM and PM AF spectrum are
selected, or in dBm or dB if RF POWER, RF POWER AF spectrum and RF
SPECTRUM are selected.

Software Manual 1141.1821.42 - 07 30

R&S FS-K7 Settings of the FM Demodulator

NEXT PEAK

REF LEVEL

=MKR LVL

PEAK

EXCURSION

MKR

MKR

SELECT
MARKER

CENTER

=MKR FREQ

SEARCH
LIMITS

MRK->TRACE

AMPL

SPAN

PEAK

MIN

NEXT

MIN RIGHT

FCTN

RIGHT
LIMIT

LEFT

LIMIT

THRESHOLD

NEXT

PEAK LEFT

NEXT

PEAK RIGHT

NEXT

MIN LEFT

NEXT MIN

MKR

MKR

SELECT
MARKER

SHAPE FACT
60:3 60:6

MRK->TRACE

AMPTSPAN

PEAK

FCTN

2.8 MKR  Key

The MKR  menu functions are identical to those of the base unit.
The function REF LEVEL = MKR LVL is not available if the FM result display is active.

2.9 MKR FCTN Key

Software Manual 1141.1821.42 - 07 31

The available MKR FCTN menu functions are identical to those of the base unit.

R&S FS-K7 Settings of the FM Demodulator

2.10 MEAS Key

The MEAS menu functions are not available in the FM DEMOD mode.

2.11 Other Keys

The functions of the other keys are identical to those of the base unit. Please refer to
the relevant chapters in the operating manual of the base unit.

Software Manual 1141.1821.42 - 07 32

R&S FS-K7 Multicarrier Phase Measurement

Multicarrier phase measurement is only supported by R&S FSQ and R&S FSG.

Length FFT

Frequency Sample

f

FFT

IQ-Data

Level
Phase

Freq. Offset

Estimation

NCO

Rectangular

Window

 

f 1rriersNumberOfCaSpan

3 Multicarrier Phase Measurement

The Multicarrier Phase Measurement returns spectral magnitude and phase values of
an input signal consisting of several unmodulated carriers. These results can further be
used to calculate frequency response and group delay characteristics of radio
channels.

Two different measurement methods are implemented to calculate the level and phase
values versus frequency. The orthogonal method returns the result at the carrier
frequencies only and offers superior performance and accuracy. The flattop method
returns a more convenient spectrum plot showing also the transitions between the
carriers and should be selected to get a spectral overview.

3.1 Orthogonal Method

The sample frequency and the FFT length are internally chosen such that their ratio
equals the carrier spacing f.

Thus all carriers are orthogonal to each other within an observation interval of one FFT
length and the FFT returns phase and level results exactly at the carrier frequencies.
Several FFT results are averaged according to the selected measurement time. The
FFT is preceded by a frequency correction to avoid intercarrier interference by
matching the carrier frequencies to the FFT grid.

Fig. 4 Block diagram of the orthogonal measurement method

It is recommended to set the span according to the following equation:

.

Software Manual 1141.1821.42 - 07 33

R&S FS-K7 Multicarrier Phase Measurement

FFT

IQ-Data Level

Phase

Flattop

Window







d

d )(



)(k

cal



)(k

meas



)()()( kkk

calmeas





f

kk

k













2

)1()(

)(

3.2 Flattop Method

The IQ data signal is multiplied by a flattop window before performing the FFT. The
flattop window guarantees correct level and phase values even if the carrier
frequencies do not match the FFT grid, so this method is applicable if the carrier
spacing is not uniform. The measurement time determines the FFT length and must be
chosen high enough to avoid overlapping of the window responses of adjacent
carriers. The resulting trace data contains also the transitions between the carriers.

Fig. 5 Block diagram of the flattop measurement method

3.3 Group Delay Measurements

The group delay of a DUT is defined as the negative derivative of the phase response
with respect to the angular frequency

.

It is recommended to use an input signal with low crest factor and the orthogonal
measurement method to get the phase response of the DUT. A calibration
measurement should be performed to account for the internal frequency responses of
the transmitter and the analyzer. A common reference frequency is mandatory. An
external trigger must be used for absolute group delay measurements. The following
list summarizes the necessary measurement and calculation steps:

1. Calibration Measurement without DUT →

2. Measurement with DUT →

3. Calculate DUT Phase Response

4. Unwrap Phase Response

5. Calculate Group Delay

3.4 Settings –MC PHASE RESPONSE Menu

The MC PHASE RESPONSE softkey in the main menu of the FM demodulator opens
the menu to perform multicarrier phase measurements.

Software Manual 1141.1821.42 - 07 34

R&S FS-K7 Multicarrier Phase Measurement

MC PHASE ON / OFF

MEAS METHOD

CARRIER SPACING

SPAN

MEASTIME AUTO

MEASTIME MANUAL

RESULT DISPLAY

The arrangement of the softkeys in the RANGE submenu depends on the set diagrams
(Magnitude vs Freq / Phase vs Freq / Phase Polar)..

MC PHASE ON / OFF

The MC PHASE ON / OFF softkey switches the multicarrier phase measurement on or
off.

Remote: SENS1:ADEM ON
SENS1:ADEM:MCPH:STAT ON

MEAS METHOD

The softkey opens a list box to select between the method based on orthogonal and
flattop-window measurement.

Software Manual 1141.1821.42 - 07 35

R&S FS-K7 Multicarrier Phase Measurement

MEAS METHOD

Orthogonal
Flattop

f

Center

Frequency

Span

f

Remote: SENS1:ADEM:MCPH:METH ORTH

CARRIER SPACING

The CARRIER SPACING softkey defines the spacing between two carriers.

Note:
For the method based on flattop-window measurement, the carrier spacing is only

required to calculate the automatic measurement time.

Remote: SENS1:ADEM:MCPH:SPAC 100KHZ

SPAN

The SPAN softkey defines the number of carriers to be measured.

Example:
A span  3 * carrier spacing (f) is required to measure a signal with four carriers.

Remote: SENS1:ADEM:SPEC:SPAN:MAX 3MHZ

MEASTIME AUTO

The MEASTIME AUTO softkey activates the automatic calculation of the recording
length.

Remote: SENS1:ADEM:MTIM:AUTO ON

MEASTIME MANUAL

The MEASTIME MANUAL softkey opens a data entry field to manually enter the
recording length.

Remote: SENS1:ADEM:MTIM 1ms

RESULT DISPLAY

The RESULT DISPLAY softkey opens the submenu to select the required
measurement function (s. section "Selection of Result Display – RESULT DISPLAY "
Menu).

Software Manual 1141.1821.42 - 07 36

R&S FS-K7 Multicarrier Phase Measurement

MAGNITUDE VS FREQ

PHASE VS FREQ

PHASE POLAR

POLAR DIAG START FREQ

POLAR DIAG STOP FREQ

3.4.2 Selection of Result Display – RESULT DISPLAY Menu

The RESULT DISPLAY softkey opens a submenu to select the measurement result to
be displayed.

The magnitude or phase of the signal in the frequency domain or the phase in a polar
diagram can be selected.

All results are determined by the I/Q data set recorded for the measurement. In the
SINGLE SWEEP mode, the data set recorded once can be evaluated in all diagrams
by simply switching over the result display.

MAGNITUDE VS FREQ

The MAGNITUDE VS FREQ softkey selects the level diagram of the signal in the
frequency domain.

Software Manual 1141.1821.42 - 07 37

Remote: CALC:FEED ‘XFR:SPEC:MAGN’

PHASE VS FREQ

The PHASE VS FREQ softkey selects the phase diagram of the signal in the frequency
domain.

R&S FS-K7 Multicarrier Phase Measurement

Remote: CALC:FEED ‘XFR:SPEC:PHAS’

PHASE POLAR

The PHASE POLAR softkey selects the phase diagram in a polar diagram. The
displayed frequency domain is determined with the two softkeys POLAR DIAG START
FREQ and POLAR DIAG STOP FREQ.

Remote: CALC:FEED ‘SPEC:POL’

Software Manual 1141.1821.42 - 07 38

R&S FS-K7 Multicarrier Phase Measurement

RANGE

Magnitude vs Freq

Phase vs Freq
Phase Polar

Result Display:

RF POWER

PER DIV

MAX DISP
RF POWER

RANGE

LINEAR

RANGE

LOG MANUAL

RANGE

LINEAR %

RANGE

LINEAR dB

Y PER DIV

REFERENCE

POSITION

REFERENCE

VALUE

PM UNIT

RAD DEG

POLAR DIAG START FREQ

The POLAR DIAG START FREQ softkey determines the start frequency starting from
which the phases are displayed in the polar diagram. In the MAGNITUDE VS FREQ
and PHASE VS FREQ diagrams, the start frequency is characterized by a display line.

Remote: CALC:ADEM:MCPH:POL:FREQ:STAR 100MHz’

POLAR DIAG STOP FREQ

The POLAR DIAG STOP FREQ softkey determines the stop frequency up to which the
phases are displayed in the polar diagram. In the MAGNITUDE VS FREQ and PHASE
VS FREQ diagrams, the stop frequency is characterized by a display line.

Remote: CALC:ADEM:MCPH:POL:FREQ:STOP 120MHz’

3.4.3 Scaling of Measurement Results –RANGE Menu

Software Manual 1141.1821.42 - 07 39

The RANGE softkey opens a submenu to determine the diagram scaling for the
selected display.

The visible selection of the softkeys depends on the selected diagram (Magnitude vs
Freq / Phase vs Freq / Phase Polar).

The scaling of the level diagram (Magnitude vs Freq) is identical to the level diagrams
of analog demodulation (RF Power und RF Spectrum).

R&S FS-K7 Multicarrier Phase Measurement

3.4.4 Scaling Functions for Result Displays with Phase Diagrams

Y PER DIV

The Y PER DIV softkey determines the scaling of the Y axis for the two phase
diagrams (Phase vs Freq / Phase Polar).

To display the phase in the frequency domain, make the entry using the unit selected
by means of the PM UNIT RAD/DEG softkey.

In the polar diagram, the entry is made in Volt. The scaling of the X axis is coupled to
the Y axis in the polar diagram.

Remote: DISP:WIND:TRAC:Y:PDIV 0.5RAD

REFERENCE POSITION

The REFERENCE POSITION softkey determines the position of the reference line for
the phase diagram in the frequency domain. The default setting is 50 % (diagram
center).

Remote: DISP:WIND:TRAC:Y:RPOS 50PCT

REFERENCE VALUE

The REFERENCE VALUE softkey determines the value of the reference line for phase
diagram in the frequency domain. The basic setting is 0 rad.

Remote: DISP:WIND:TRAC:Y:RVAL 0RAD

PM UNIT RAD/DEG

The PM UNIT RAD/DEG softkey allows you to select the unit for displaying phase
values.

Remote: UNIT:ANGL RAD

Software Manual 1141.1821.42 - 07 40

R&S FS-K7 Remote Control - Description of Commands

The measurements of the FM Demodulator mode are always carried out in screen A.
Therefore, the commands where the numeric suffix selects the screen must either start
with numeric suffix 1 (i.e. CALCulate1) or without a numeric suffix (i.e. CALCulate).

4 Remote Control - Description of Commands

The information in this chapter supplements and updates chapters 5 and 6 of the R&S
FSP manual. This chapter contains the new commands that apply specifically to option
R&S FS-K7 as well as the modified commands of the basic instrument provided they
are used by R&S FS-K7.

Every attempt was made to ensure the highest possible compatibility of the R&S FS­K7 commands with those of analog demodulation of the FSE family. A few commands
were included in the command set for this reason only.

In the description of menu operation in chapter 2, each softkey is indicated with the
associated IEC/IEEE bus commands.

4.1 Common Commands

*OPT?

OPTION IDENTIFICATION QUERY queries the options included in the instrument

and returns a list of the installed options. The options are separated by commas. In
the response string, the identification of option R&S FS-K7 is indicated at position
32:

Example:

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,K7,0,0,0,0,0,0,0,0

4.2 CALCulate Subsystem

4.2.1 CALCulate:ADEMod Subsystem

CALCulate1:ADEMod:MCPHase:POLar:FREQuency:STARt <numeric_value>

Multicarrier measurement: start frequency for range selection in polar diagram.

Example

SENS1:ADEM ON
'Switch on Ademod measurement.

Software Manual 1141.1821.42 - 07 41

R&S FS-K7 Remote Control - Description of Commands

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:ADEM:MCPH:POL:FREQ:STAR:STAT ON
'Switch on start frequency.

CALC1:ADEM:MCPH:POL:FREQ:STAR 20GHZ
'Set start frequency.

Characteristics

*RST value: ­SCPI: device-specific

CALCulate1:ADEMod:MCPHase:POLar:FREQuency:STARt:STAT ON|OFF

Multicarrier measurement: activates start frequency for range selection in polar
diagram and activates display line in the frequency diagram

Example

SENS1:ADEM ON
'Switch on Ademod measurement.

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:ADEM:MCPH:POL:FREQ:STAR:STAT ON"
'Start frequency to default, activate display line.

Characteristics

*RST value: OFF
SCPI: device-specific

CALCulate1:ADEMod:MCPHase:POLar:FREQuency:STOP <numeric_value>

Multicarrier measurement: stop frequency for range selection in polar diagram.

Example

SENS1:ADEM ON
'Switch on Ademod measurement.

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:ADEM:MCPH:POL:FREQ:STOP:STAT ON
'Switch on stop frequency

CALC1:ADEM:MCPH:POL:FREQ:STOP 20.001GHZ
'Set stop frequency.

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 42

R&S FS-K7 Remote Control - Description of Commands

CALCulate1:ADEMod:MCPHase:POLar:FREQuency:STOP:STATe ON|OFF

Multicarrier measurement: activates stop frequency for range selection in polar
diagram and activates display line in the frequency diagram.

Example

SENS1:ADEM ON
'Switch on Ademod measurement.

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:ADEM:MCPH:POL:FREQ:STOP:STAT ON
'Stop frequency to default, activate display line.

Characteristics

*RST value: OFF
SCPI: device-specific

CALCulate<1|2>:ADEMod:THD:FREQuency:FUNDamental:AUTO[:STATe] ON | OFF

This command switches between automatic or manual selection of the
fundamental frequency used for the SINAD and THD calculations. With automatic
selection the peak in the AF spectrum is used as the fundamental frequency.
When switching the auto state off, the current modulation frequency result is used as a
default for CALC:ADEM:THD:FREQ if the measurement result is available at this time.
This command is available, if Result AF SPECTRUM is switched on.

Example

CALC:ADEM:THD:FREQ:FUND:AUTO OFF
'deactivates the auto selection and uses the current
'Modulation Freq. as fundamental frequency
CALC:ADEM:THD:FREQ:FUND:VAL 1kHz
'set the fundamental frequency

Characteristics

*RST value: ON
SCPI: device-specific

CALCulate<1|2>:ADEMod:THD:FREQuency:FUNDamental:VALue ON | OFF

This command sets the fundamental frequency used for the SINAD and THD
calculations.
The query command is available only with "CALC:ADEM:THD:FREQ:FUND:AUTO
OFF".

Example

CALC:ADEM:THD:FREQ:FUND:AUTO OFF
'deactivates the auto selection and uses th current

Software Manual 1141.1821.42 - 07 43

R&S FS-K7 Remote Control - Description of Commands

Result display FM:

Hz Result display PM:

rad | deg

Result display AM:

%

Result display RF POWER:

dB

(logarithmic display)

% (linear display)

Result display RF SPECTRUM:

dB

(logarithmic display)

% linear display)

Result display AF SPECTRUM:

dB

(logarithmic display)

Hz | % | rad | deg

(linear display)

'Modulation Freq.as fundamental frequency

Characteristics

*RST value: ON
SCPI: device-specific

4.2.2 CALCulate:DELTamarker Subsystem

The CALCulate:DELTamarker subsystem controls the delta marker functions in the
instrument.

CALCulate<1|2>:DELTamarker<1...4>:Y?

This command queries the measured value of the selected delta marker in the
indicated measurement window. The corresponding delta marker will be activated,
if necessary. The output is always a relative value referred to marker 1.
To obtain a valid query result, a complete sweep with synchronization to the sweep
end must be performed between the activation of the delta marker and the query of
the y value. This is only possible in single sweep mode.
Depending on the on the activated measuring functions, the query result is output
in the units below:

Example

INIT:CONT OFF
'Switch to single-sweep mode

CALC:DELT2 ON
'Switch on delta marker 2

INIT;*WA
'Start a sweep and wait for its end

CALC:DELT2:Y?
'Output measured value of delta marker 2.

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 44

R&S FS-K7 Remote Control - Description of Commands

'SPECtrum:POLar'

'XFRequency:SPECtrum[:MAGNitude]'

'XFRequency:SPECtrum:PHASe'
'XTIM:AM:RELative[:TDOMain]'

'XTIM:AM:RELative:AFSPectrum<1...3>'
'XTIM:AM[:ABSolute][:TDOMain]'

'XTIM:AM[:ABSolute]:AFSPectrum<1...3>'

'XTIM:RFPower[:TDOMain]'

'XTIM:RFPower:AFSPectrum<1...3>'
'XTIM:FM[:TDOMain]'

'XTIM:FM:AFSPectrum<1...3>'
'XTIM:PM[:TDOMain]'

'XTIM:PM:AFSPectrum<1...3>'

'XTIM:AMSummary<1...3>[:ABSolute]'

'XTIM:AMSummary<1...3>:RELative'
'XTIM:FMSummary<1...3>'

'XTIM:PMSummary<1...3>'

'XTIM:SPECtrum'

4.2.3 CALCulate:FEED Subsystem

The CALCulate:FEED subsystem selects the type of evaluation of the measured data.
This corresponds to the selection of the Result Display in manual mode.
If the FM demodulator is active, the selection of the type of evaluation is independent of the
measurement window. Therefore, the numeric suffix <1|2> is irrelevant and ignored.

CALCulate<1|2>:FEED <string>

This command selects the trace data to be displayed.

Parameters:

<string>::=

Example

CALC:FEED ‘XTIM:FM’
'Select the display of the FM signal

Characteristics

Software Manual 1141.1821.42 - 07 45

R&S FS-K7 Remote Control - Description of Commands

PHASe:

Limitation to 180

UPHase:

Unwrapped

*RST value: XTIM:FM’
SCPI: conforming

4.2.4 CALCulate:FORMat Subsystem

The CALCulate:FORMat subsystem defines the conversion of measured data.

CALCulate<1|2>:FORMat PHASe | UPHase

This command activates the limitation to 180.

Parameter:

Example

CALC:FORM PHAS
'Activated the limitation to 180.

Characteristics

*RST value: UPAS
SCPI: conforming

4.2.5 CALCulate:MARKer Subsystem

The CALCulate:MARKer subsystem controls the marker functions in the instrument.

CALCulate<1|2>:MARKer<1...4>:PEXCursion <numeric_value>

This command defines the peak excursion, i.e. the spacing below the trace
maximum which must be attained before a new maximum is recognized, or the
spacing above the trace minimum which must be attained before a new minimum
is recognized. The set value is valid for all markers and delta markers.
The unit of the numerical value depends on the active display.

Example

CALC:MARK:PEXC 10dB
'SPECTRUM display
CALC:MARK:PEXC 100 Hz
'FM DEMOD display

Characteristics

Software Manual 1141.1821.42 - 07 46

*RST value: 50 kHz (for FM displays)

0.5 RAD (for PM displays)

5 PCT (for standardized AM displays)
6 dB (for level displays)
SCPI: device-specific

The numeric suffix <1...4> in MARKer is irrelevant.

R&S FS-K7 Remote Control - Description of Commands

If several demodulation modes are activated simultaneously with command
SENS:ADEM:FM:TYPE, SENS:ADEM:PM:TYPE, SENS:ADEM:AM:TYPE,
SENS:ADEM:RFP:TYPE, SENS:ADEM:FM:AFSP:TYPE,
SENS:ADEM:PM:AFSP:TYPE, SENS:ADEM:AM:AFSP:TYPE or
SENS:ADEM:RFP:AFSP, the audio frequency of the display mode selected with
CALC:FEED is returned.

CALCulate<1|2>:MARKer<1...4>:Y?

This command queries the measured value of the selected marker in the selected
measurement window. The corresponding marker is activated before or switched
to marker mode, if necessary.
To obtain a valid query result, a complete sweep with synchronization to the sweep
end must be performed between the activation of the marker and the query of the y
value. This is only possible in single sweep mode.

Example

INIT:CONT OFF
'Switch to single-sweep mode

CALC:MARK2 ON
'Switch on marker 2

INIT;*WAI
'Start a sweep and waits for its end

CALC:MARK2:Y?
'Output the measured value of marker 2.

Characteristics

*RST value: ­SCPI: device-specific

4.2.6 CALCulate:MARKer:FUNCtion:ADEMod Subsystem

The CALCulate:MARKer:FUNCtion:ADEMod subsystem contains the marker functions
for the option FM Demodulator R&S FS-K7.

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:AFRequency[:RESult<1...3>]?

This command queries the audio frequency with analog demodulation. The
numeric suffix indicates whether trace 1, 2 or 3 is selected.

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:AM:TDOM
'Switch on AM result display or

Software Manual 1141.1821.42 - 07 47

R&S FS-K7 Remote Control - Description of Commands

PPEak

Result of measurement with detector +PK

MPEak

Result of measurement with detector -PK

MIDDle

Result of averaging PK/2

RMS

Result of measurement with detector RMS

CALC:FEED 'XTIM:FM:TDOM
'Switch on FM result display or

CALC:FEED 'XTIM:RFP:AFSP
'Switch on AF spectrum result

DISP:TRAC ON
'display of the FM and trace or

CALC:FEED 'XTIM:RFP:AFSP
'Switch on AF spectrum result display

DISP:TRAC ON
'of the RF power signal and trace

CALC:MARK:FUNC:ADEM:AFR?
Query audio frequency

Characteristics

*RST value: ­SCPI: device-specific

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:AM[:RESult<1...3>]? PPEak| MPEak| MIDDle| RMS

This command queries the results of the AM modulation measurement. The
numeric suffix (:RESult<1...3>) indicates whether trace 1, 2 or 3 is selected.

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:AM:REL:TDOM
'Switch on AM result display

DISP:TRAC ON
'Switch on trace

CALC:MARK:FUNC:ADEM:AM? PPE
'Query the peak value

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 48

R&S FS-K7 Remote Control - Description of Commands

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:CARRier[:RESult<1...3>]?

This command queries the carrier power.
With the RF power result display, the carrier power is determined from trace 1 to 3

as specified in the numeric suffix. With all other result displays, the carrier power is
determined from the current trace data (CLR/WRITE trace).

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:RFP
'Switch on RF power result display

CALC:MARK:FUNC:ADEM:CARR?
'Query carrier power

Characteristics

*RST value: ­SCPI: device-specific

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:FERRor[:RESult<1...3>]?

This command queries the frequency error with FM and PM demodulation. With
FM demodulation, trace 1 to 3 is selected with the numeric suffix (:RESult<1...3>).
With PM demodulation, the frequency error is determined from the current
measurement data (CLR/WRITE trace).

The mean offset thus determined differs from that calculated in
the[SENSe:]ADEMod:FM:OFFSet? query, since, for determining the frequency
deviation, the modulation is removed by means of lowpass filtering, producing
results that are different from those obtained by averaging with the SENSe:...
command.

This command is available only for traces in the FM and PM result displays. If any
other result display is selected, this command is disabled.

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:FM:TDO
'Switch on FM result display

CALC:MARK:FUNC:ADEM:FERR?
'Query frequency error of trace 1

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 49

R&S FS-K7 Remote Control - Description of Commands

PPEak

Result of measurement with detector +PK

MPEak

Result of measurement with detector -PK

MIDDle

Result of averaging PK/2

RMS

Result of measurement with detector RMS

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:FM[:RESult<1...3>]? PPEak | MPEak | MIDDle | RMS

This command queries the results of FM modulation measurement. The numeric
suffix indicates whether trace 1, 2 or 3 is selected.

PPEak Result of measurement with detector +PK
MPEak Result of measurement with detector -PK
MIDDle Result of averaging PK/2
RMS Result of measurement with detector RMS

Example

ADEM ON
'Switch on FM demodulator
CALC:FEED 'XTIM:AM:REL:TDOM
'Switch on AM result display
DISP:TRAC ON
'Switch on trace
CALC:MARK:FUNC:ADEM:AM? PPE
'Query the peak value

Characteristics

*RST value: ­SCPI: device-specific

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:PM[:RESult<1...3>]? PPEak | MPEak | MIDDle | RMS

This command queries the results of the PM modulation measurement of analog
demodulation. The numeric suffix (:RESult<1...3>) indicates whether trace 1, 2 or 3
is selected.

Example

ADEM ON
'Switch on FM demodulator
CALC:FEED 'XTIM:PM:TDOM
'Switch on PM result display
DISP:TRAC ON
'Switch on trace
CALC:MARK:FUNC:ADEM:PM? PPE
'Query the peak value

Software Manual 1141.1821.42 - 07 50

R&S FS-K7 Remote Control - Description of Commands

Characteristics

*RST value: ­SCPI: device-specific

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:SINad:RESult<1...3>?

This command queries the result of the SINAD measurement. The numeric suffix
(:RESult<1...3>) indicates whether trace 1, 2 or 3 is selected.

Example

ADEM ON"
'Switch on FM demodulator
CALC:FEED 'XTIM:RFP:AFSP
'Switch on AF spectrum of FM
DISP:TRAC ON
'Switch on trace
CALC:MARK:FUNC:ADEM:SIN:RES?
'Query SINAD result

Characteristics

*RST value: ­SCPI: device-specific

CALCulate<1|2>:MARKer<1...4>:FUNCtion:ADEMod:THD:RESult<1...3>?

This command queries the result of the THD measurement. The numeric suffix
(:RESult<1...3>) indicates whether trace 1, 2 or 3 is selected.

Example

ADEM ON
'Switch on FM demodulator
CALC:FEED 'XTIM:RFP:AFSP
'Switch on AF spectrum of FM
DISP:TRAC ON
'Switch on trace
CALC:MARK:FUNC:ADEM:THD:RES?
'Query THD result

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 51

R&S FS-K7 Remote Control - Description of Commands

CALCulate<1|2>:MARKer<1 to 4>:FUNCtion:MDEPth:RESult?

This command queries the AM modulation depth in the indicated measurement window.
A complete sweep with synchronization to sweep end must be performed between
switching on the function and querying the measured value to obtain a valid query
result. This is only possible in single sweep mode.
The numeric suffix <1 to 4> of :MARKer is irrelevant for this command.

Example

INIT:CONT OFF
'Switches to single-sweep mode.

CALC:MARK:X 10MHZ
'Sets the reference marker (marker 1) to 'the carrier signal
at 10 MHz.

CALC:MARK:FUNC:MDEP ON
'Switches on the modulation depth 'measurement in screen A.

INIT;*WAI
'Starts a sweep and waits for the end.

CALC:MARK:FUNC:MDEP:RES?
'Outputs the measured value of screen A.

Characteristics

*RST value: ­SCPI: device-specific

This command is only a query and therefore has no *RST value.

CALCulate<1|2>:MARKer<1 to 4>:FUNCtion:MDEPth:[:STATe]

This command switches on the measurement of the AM modulation depth. An AM­modulated carrier is required on the screen for correct operation. If necessary,
marker 1 is previously activated and set to the largest signal available.

The level value of marker 1 is regarded as the carrier level. On activating the
function, marker 2 and marker 3 are automatically set as delta markers
symmetrically to the carrier to the adjacent maxima of the trace.

If the position of delta marker 2 is changed, delta marker 3 is moved symmetrically
with respect to the reference marker (marker 1). If the position of delta marker 3 is
changed, fine adjustment can be performed independently of delta marker 2.

The analyzer calculates the power at the marker positions from the measured levels.
The AM modulation depth is calculated from the ratio of power values at the

reference marker and the delta markers. If the two AM sidebands differ in power,
the average value of the two power values is used for calculating the AM
modulation depth.

The numeric suffix <1 to 4> of :MARKer is irrelevant with this command.

Software Manual 1141.1821.42 - 07 52

R&S FS-K7 Remote Control - Description of Commands

Example

CALC:MARK:X 10MHZ
'Sets the reference marker (marker 1) to 'the carrier signal
at 10 MHz

CALC:MARK:FUNC:MDEP ON
'Switches on the modulation depth 'measurement in screen A.

CALC:DELT2:X 10KHZ
'Sets delta markers 2 and 3 to the signals 'at 10 kHz from
the carrier signal

CALC:DELT3:X 9.999KHZ
'Corrects the position of delta marker 3 'relative to delta
marker 2.

Characteristics

*RST value: OFF
SCPI: device-specific

4.2.7 CALCulate:UNIT Subsystem

The CALCulate:Unit subsystem defines the units for the parameters that can be set
and the measurement results.

CALCulate<1|2>: UNIT:ANGLe DEG | RAD

This command selects the unit for angles.

Example

CALC:UNIT:ANGL DEG"

Characteristics

*RST value: RAD
SCPI: device-specific

Software Manual 1141.1821.42 - 07 53

R&S FS-K7 Remote Control - Description of Commands

4.3 DISPlay Subsystem

The DISPLay subsystem controls the selection and presentation of textual and graphic
information as well as of trace data on the display.

DISPlay[:WINDow<1|2>]:TRACe<1...3>:Y[:SCALe]:PDIVision <numeric_value>

This command defines the scaling of the Y-axis in the current unit.
Separate scalings are maintained for the following displays:

- FM display

- PM display

- AM display

- Logarithmic AF spectrum display

The numeric suffix in TRACe<1...3> is irrelevant.

Example

DISP:WIND1:TRAC:Y:PDIV 10KHz
'Set Y scale to '10 kHz/div.

Characteristics

*RST value: 50 kHz (FM display)
2 rad (PM display)
20 PCT (AM display)
10 dB (AF spectrum display)
SCPI: conforming

DISPlay[:WINDow<1|2>]:TRACe<1...3>:Y[:SCALe]:RPOSition 0...100PCT

This command defines the position of the reference value in the selected
measurement window. The numeric suffix in TRACe<1...3> is irrelevant.
Separate reference positions are maintained for the following displays:

- RF power, RF spectrum and AF spectrum of the RF power

- FM, PM and AM

- AF spectrum of the FM, PM and A

Example

DISP:WIND1:TRAC:Y:RPOS 50PCT

Characteristics

*RST value: 100 PCT (level display)
50 PCT (FM, PM or AM display)
100 PCT (AF spectrum display of the FM, PM or AM)
SCPI: conforming

Software Manual 1141.1821.42 - 07 54

R&S FS-K7 Remote Control - Description of Commands

DISPlay[:WINDow<1|2>]:TRACe<1...3>:Y[:SCALe]:RVALue <numeric_value>

This command defines the reference value assigned to the reference position, thus
corresponding to the REFERENCE VALUE parameter in manual control. Separate
reference values are maintained for the various displays.
The numeric suffix in TRACe<1...3> is irrelevant.

Example

DISP:WIND1:TRAC:Y:RVAL 0
'Defines the display value of the reference position at 0 dB

Characteristics

*RST value: 0 Hz
0 rad (PM display)
0 PCT (AM display)
250 kHz (FM AF spectrum display)
10 rad (PM AF spectrum display)
100 PCT (AM AF spectrum display)
SCPI: device-specific

DISPlay[:WINDow<1|2>]:TRACe<1...3>:Y:SPACing LINear | LOGarithmic | LDB

This command switches between linear and logarithmic display in the selected
window. In the case of linear display, it is also possible to switch between unit %
(command DISP:WIND:TRAC:Y:SPAC LIN) and unit dB (command
DISP:WIND:TRAC:Y:SPAC LDB). .
In the case of AF spectrum displays, only the parameters LINear and LOGarithmic
are permitted.
The numeric suffix for TRACe<1...3> is irrelevant.

Example

DISP:WIND1:TRAC:Y:SPAC LIN

Characteristics

*RST value: LOGarithmic
SCPI: conforming

Software Manual 1141.1821.42 - 07 55

R&S FS-K7 Remote Control - Description of Commands

4.4 INSTrument Subsystem

The INSTrument subsystem selects the operating mode of the unit either via text
parameters or fixed numbers.

INSTrument:NSELect 1| 3

This command switches between the operating modes by means of numbers.

Parameter:

1: Spectrum analysis mode
3: FM demodulator mode

Example

INST:NSEL 1
'Switch to SPECTRUM mode

Characteristics

*RST value: 1
SCPI: conforming

INSTrument[:SELect] SANalyzer | ADEMod

This command switches between the operating modes by means of text
parameters.

Parameter:
ADEMod: FM demodulator mode

SANalyzer: Spectrum analysis mode

Example

INST SAN
'Switch to SPECTRUM mode

Characteristics

*RST value: SANalyzer
SCPI: conforming

4.5 SENSe Subsystem

The SENSe subsystem is organized in several subsystems. The commands of these
subsystems directly control device-specific settings; they do not refer to the signal
characteristics of the measurement signal.

The SENSe subsystem controls the essential parameters of the analyzer. In
accordance with the SCPI standard, the keyword "SENSe" is optional for this reason,
i.e. it is not necessary to include the SENSe node in command sequences.

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R&S FS-K7 Remote Control - Description of Commands

Demodulation will be performed offline, i.e. on signals previously stored into memory.
The I/Q memory available for this purpose is 2 x 128 k samples. The sampling rate can
be selected in the range from 15.625 to 32 MHz.

The R&S FS-K supports measurement data rates up to 64 MHz, and the option R&S
FS-K-B72 supports rates up to 256 MHz.

t

Record Length

Trigger

Signal

Offset

Samples

4.5.1 [SENSe:]ADEMod Subsystem

The purpose of the commands defined below is to set up the R&S FSP spectrum
analyzer for the measurement of FM, PM and AM modulated signals in a way that
allows to obtain as many measurement results as possible with a single shot
measurement.

For this purpose, the R&S FSP has been equipped with a demodulator that is capable
of performing both FM and AM demodulation at a time. Additionally maximum,
minimum and average or current values can be obtained in parallel over a selected
number of measurements. In order to make it suitable for bursted signals the
demodulator can be configured in terms of pretrigger time, sample rate and record
length.

Example In the case of a Bluetooth signal, the signal in question is described in the

following diagram:
Frequency versus time:

Measurement results of interest are:

● FM offset

● FM deviation (maximum and minimum) for signal modulated with ‘1‘ values only.

● FM deviation (maximum and minimum) for signal modulated with ‘0‘ values only.

● AM modulation depth for positive and negative burst ramp.

These values can be obtained by external computations from the frequency or
amplitude versus time data. For this purpose, the R&S FSP will deliver the following
results:

● Demodulated FM signal (current values, averaged, maxhold or minhold selectable)

Software Manual 1141.1821.42 - 07 57

R&S FS-K7 Remote Control - Description of Commands

WRITe

The current measurement results are determined.

AVERage

The measurement results are averaged over a specified number of
measurements

MAXHold

The maximum result values are determined over a specified number of
measurements

MINHold

The minimum result values are determined over a specified number of
measurements

Analog demodulation is only available for screen A. Therefore, it is not permissible to
enter "SENSe2..." for the commands of the SENSe:ADEMod subsystem.

● Demodulated AM signal (current values, averaged, maxhold or minhold
selectable)

● FM offset (current value or averaged selectable)

The following settings are required on the R&S FSx:

● Types of demodulation to be performed simultaneously (AM/FM)

● Sampling rate

● Record length

● Trigger source (free run/external)

● Pretrigger samples

● Number of measurements for average/maxhold/minhold

In addition, the required measurement results need to be configured for each type of
demodulation. The R&S FSx can simultaneously determine multiple types of
demodulation with a maximum of 3 different result types. The following result types can
be selected:

In practice, the commands defined below are used as follows:
The instrument is set first. Then a measurement is started and the result list read in

after synchronization to the end of the measurement. This method permits the control
computer to be used for other tasks while the R&S FSP is performing the
measurement.

[SENSe:]ADEMod:AF:CENTer <numeric_value>

This command sets the center frequency for the display of the AF spectrum.

Example

ADEM ON
'Switch on FM demodulator
CALC:FEED 'XTIM:RFP:AFSP
'Switch on "FM AF spectrum" display

or
CALC:FEED 'XTIM:RFP:AFSP
'Switch on "AF spectrum of the RF power signal" display

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R&S FS-K7 Remote Control - Description of Commands

ADEM:BAND 5 MHz
'Set meas. bandwidth to 5 MHz

ADEM:AF:CENT 500kHz
'Set AF center frequency to 500 kHz

ADEM:AF:SPAN 200kHz
'Set AF span to 200 kHz

Characteristics

*RST value: 1.25 MHz
SCPI: device-specific

[SENSe:]ADEMod:AF:COUPling AC | DC

This command selects the coupling of the AF path.

Example

ADEM:AF:COUP DC
'Switch on DC coupling.

Characteristics

*RST value: AC
SCPI: device-specific

[SENSe:]ADEMod:AF:SPAN <numeric_value>

This command sets the span for the display of the AF spectrum.
The span is limited to half the measurement bandwidth of analog demodulation
(SENS:ADEM:BAND).

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:RFP:AFSP'
'Set "FM AF spectrum" display

or

CALC:FEED 'XTIM:RFP:AFSP'
'Switch on "AF spectrum of the RF power signal" display

ADEM:BAND 5 MHz
'Set meas. bandwidth to 5 MHz

ADEM:AF:CENT 500kHz
'Set AF center frequency to 500 kHz

ADEM:AF:SPAN 200kHz
'Set AF span to 200 kHz

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R&S FS-K7 Remote Control - Description of Commands

Characteristics

*RST value: 2.5 MHz
SCPI: device-specific

[SENSe:]ADEMod:AF:SPAN:FULL

This command sets the maximum span for the display of the AF spectrum.
The maximum span corresponds to half the measurement bandwidth of analog
demodulation (SENS:ADEM:BAND).

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED'XTIM:RFP:AFSP'
'Switch on "FM AF spectrum" display

or

CALC:FEED'XTIM:RFP:AFSP'
'Switch on "AF spectrum of the RF power signal" display

ADEM:BAND 5 MHz
'Set meas. bandwidth to 5 MHz

ADEM:AF:SPAN:FULL
'Set AF span to 2.5 MHz

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:AF:STARt <numeric_value>

This command sets the start frequency for the display of the AF spectrum.

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:RFP:AFSP'
'Switch on "FM AF spectrum" display

or

CALC:FEED 'XTIM:RFP:AFSP'
'Switch on "AF spectrum of the RF power signal" display

ADEM:BAND 5 MHz
'Set meas. bandwidth to 5 MHz

ADEM:AF:STAR 0kHz
'Set AF start frequency to 0 kHz

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R&S FS-K7 Remote Control - Description of Commands

ADEM:AF:STOP 500kHz
'Set AF stop frequency to 500 kHz

Characteristics

*RST value: 0 MHz
SCPI: device-specific

[SENSe:]ADEMod:AF:STOP <numeric_value>

This command sets the stop frequency for the display of the AF spectrum.
The stop frequency is limited to half the measurement bandwidth of analog
demodulation (SENS:ADEM:BAND).

Example

ADEM ON
'Switch on FM demodulator

CALC:FEED 'XTIM:RFP:AFSP'
'Switch on "FM AF spectrum" display

or

CALC:FEED 'XTIM:RFP:AFSP'
'Switch on "AF spectrum of the RF power signal" display

ADEM:BAND 5 MHz
'Set meas. bandwidth to 5 MHz

ADEM:AF:STAR 0kHz
'Set AF start frequency to 0 kHz

ADEM:AF:STOP 500kHz
'Set AF stop frequency to 500 kHz

Characteristics

*RST value: 2.5 MHz
SCPI: device-specific

Software Manual 1141.1821.42 - 07 61

R&S FS-K7 Remote Control - Description of Commands

Demodulation
bandwidth

Sampling rate

Comment

120 MHz

256 MHz

with R&S FSQ-B72 only

50 MHz/85 MHz

(1)

128 MHz

with R&S FSQ-B72 only

30 MHz

64 MHz

with R&S FSQ only

18 MHz

32 MHz

with R&S FSQ only

10 MHz

32 MHz

8 MHz

16 MHz

This restriction only applies to R&S FSP and
R&S FSU without B72:
This filter is only flat for about 6 MHz, it has a
3dB decay at 7 MHz.

5 MHz

8 MHz

3 MHz

4 MHz

1,6 MHz

2 MHz

800 kHz

1 MHz

400 kHz

500 kHz

200 kHz

250 kHz

100 kHz

125 kHz

50 kHz

62.5 kHz

25 kHz

31.25 kHz

12.5 kHz

15.625 kHz

6.4 kHz

7.8125 kHz

3.2 kHz

3.90625 kHz

1.6 kHz

1.953125 kHz

800 Hz

976.5625 Hz

400 Hz

488.28125 Hz

200 Hz

244.140625 Hz

100 Hz

122.0703125 Hz

[SENSe:]ADEMod:BANDwidth | BWIDth:DEModulation <numeric_value>

This command defines the demodulation bandwidth for analog demodulation.
Depending on the selected demodulation bandwidth, the instrument selects the
required sampling rate. The available values of the demodulation bandwidths are
defined by the sampling rates.

(1) The demodulation bandwidth at a sampling rate of 128 MHz depends on the center frequency that

Software Manual 1141.1821.42 - 07 62

has been set. At a center frequency of =3.6 GHz, the demodulation bandwidth is 50 MHz; at higher
center frequencies, it is 85 MHz.

Example

ADEM:BAND:DEM 1MHz
'Set test bandwidth to 1 MHz.

R&S FS-K7 Remote Control - Description of Commands

Characteristics

*RST value: 5 MHz
SCPI: device-specific

[SENSe:]ADEMod:MTIMe <numeric_value>

This command sets the measuring time for the analog demodulation.

Example

ADEM:MTIM 62. 5us

'Set measurement time to 62.5 s.

Characteristics

*RST value: 62. 5us
SCPI: device-specific

[SENSe1]:ADEMod:MTIMe:AUTO ON|OFF

This command activates/deactivates the automatic measurement time of the
multicarrier measurement.

Example

SENS1:ADEM ON
‘Switch on Ademod measurement.
SENS1:ADEM:MCPH:STAT ON
‘Multicarrier measurement on.
SENS1:ADEM: MTIM:AUTO OFF
'Set measurement time to manual setzen.

Characteristics

*RST value: OFF
SCPI: device-specific

[SENSe:]ADEMod:RLENgth?

This command returns the currently set record length for the analog demodulation.

Example

ADEM:RLEN?
'Return the current record length.

Characteristic:

*RST value: ­SCPI:device-specific

Software Manual 1141.1821.42 - 07 63

R&S FS-K7 Remote Control - Description of Commands

<sample rate>:

Frequency at which measured values are taken from the A/D
converter and stored in I/Q memory.

Value range:

122.0703125 Hz, 244.140625 Hz, 488.28125 Hz,

976.5625 Hz, 1.953125 kHz, 3.90625 kHz, 7.8125
kHz, 15.625 kHz, 31.25 kHz, 62.5 kHz, 125 kHz,
250 kHz, 500 kHz, 1 MHz, 2 MHz, 4 MHz, 8 MHz,
16 MHz, 32 MHz

<record length>:

Number of samples to be stored in I/Q memory.

Value range:

1 to 130560 (128 * 1024 - 512)

<trigger source>:

Selection of the trigger source for the demodulator.

Valid values:

IMMediate | EXTernal IFPower | FM | AM |
AMRelative | PM

<trigger slope>:

Trigger slope selected.

Valid values:

POSitive | NEGative

The value indicated here will be ignored for <trigger source> =
IMMediate.

<offset samples>:

Number of samples to be used as an offset to the trigger signal.

Value range:

-65024 to 130560 (= -64 * 1024 + 512 to 128 *
1024 - 512)

The indicated value is ignored for <trigger source> = IMMediate

<# of meas>:

Number of measurements. The value indicated here is particularly
necessary for the AVERage/MAXHold/MINHold function.

Value range:

0 to 32767

[SENSe:]ADEMod:SET <sample rate>,<record length>,<trigger source>,<trigger slope>,<offset samples>,<# of meas>

This command configures the FM demodulator of the R&S FSP.
Parameter:

Example

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Will perform a measurement with the following settings:
sample rate = 8 MHz
record length = 32000
trigger source = EXTernal
trigger slope = POSitive
offset samples = -500 (= 500 samples before trigger occurs )
# of meas = 30

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R&S FS-K7 Remote Control - Description of Commands

*RST values:

sample rate

= 8 MHz

record length

= 501

trigger source

= IMMediate

trigger slope

= POSitive

offset samples

= 0

# of meas

= 0

Characteristics

SCPI: device-specific

[SENSe:]ADEMod:SRATe?

This command returns the currently set sampling rate for the analog demodulation.

Example

ADEM:SRAT?
'Return the current sampling rate.

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod[:STATe] ON | OFF

This command switches on the FM demodulator of the instrument. The instrument
will be set to time-domain measurement (span = 0) at the current center frequency.

Note:
The measurement is always performed in screen A. Split-screen operation will be
switched off as soon as the demodulator is activated.

Example

ADEM ON
'Switch on the FM demodulator

Characteristics

*RST value: OFF
SCPI: device-specific

[SENSe:]ADEMod:ZOOM:STARt 0 s to measurement time

This command selects the start time for displaying the individual measurement
values of the FM demodulator. The maximum value depends on the measurement
time set in the instrument; this value can be queried with ADEM:ZOOM:START?
MAX.
If the zoom function has been switched on, 501 (R&S FSP) or 625 (R&S FSU and
R&S FSQ) measurement points will be displayed starting at the time that has been
set.

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R&S FS-K7 Remote Control - Description of Commands

<result type>:

WRITe

The current measured values are returned.

AVERage

The measurement results averaged over the
specified number of measurements are returned.

MAXHold

The maximum result over the specified number of
measurements is returned.

MINHold

The minimum result over the specified number of
measurements is returned.

Example

ADEM:ZOOM ON
'Switch on zoom function

ADEM:ZOOM:STAR 500us
'Set display starting point to 500 s

Characteristics

*RST value: 0 s
SCPI: device-specific

[SENSe:]ADEMod:ZOOM[:STATe>] ON | OFF

This command switches the zoom function for the measurement data of the FM
demodulator on or off. Depending on the selected measurement time and
demodulation bandwidth, more measurement points are captured than can be
shown on the display.
If the zoom function has been switched on, exactly 501 (R&S FSP) or 625 (R&S
FSU and R&S FSQ) measurement points from the measured value memory will be
shown starting at the time defined with [SENS:]ADEM:ZOOM:STARt.
If the zoom function has been switched off, all measurement points will be compressed
down to the number of points available on the display by means of data reduction.

Example

ADEM:ZOOM ON
'Switch on the zoom function.

Characteristics

*RST value: OFF

SCPI: device-specific

4.5.2 [SENSe:]ADEMod:AM Subsystem

[SENSe:]ADEMod:AM[:ABSolute]:AFSPectrum:RESult? <result type>

This command reads out the result data of the AF spectrum of the RF signal in the
time domain for the specified result type. The format of the output data is defined
using the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameters

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R&S FS-K7 Remote Control - Description of Commands

#4

Number of digits in the following number of data bytes (= 4 in the
Example)

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value

Note:
The specified result type must be one that was configured with the command
[SENSe:] ADEMod:AM[:ABSolute]:AFSPectrum[:TYPE]. Otherwise, a query error
will be generated.

Return values:
ASCII format (FORMat ASCII):
In this case, the command will return a list of comma-separated values (CSV) of

the measured values in floating point format. The output unit is dBm (logarithmic
display) or V (linear display).

Binary format (FORMat REAL,32):
In this case, the command will return binary data (Definite Length Block Data

according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
where

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator

ADEM:FM AVER,MAXH,MINH
'Select FM results to be measured

ADEM:AM WRIT,OFF,OFF
'Select results of the RF signal to be 'measured in the time
domain

ADEM:AM:AFSP FSP WRIT,OFF,OFF
'Select the AF spectrum results of the 'RF signal to be
measured in the time 'domain

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read FM average value result data

ADEM:FM:RES? MAXH
'Read FM MAXHold result data

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R&S FS-K7 Remote Control - Description of Commands

<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over
the specified number of measurements.

MAXHold

The maximum result over the specified
number of measurements is determined.

MINHold

The minimum result over the specified number
of measurements is determined.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.
For example, three FM and three PM result types can be activated simultaneously.
If all result types are set to OFF, no AF spectrum of the RF signal in the time domain
will be calculated.
The result type AF spectrum of the RF signal in the time domain cannot be activated
simultaneously with other AF spectra.

ADEM:FM:RES? MINH
'Read FM MINHold result data

ADEM:AM:RES? WRIT
'Read current AM result data

ADEM:AM:AFSP:RES? WRIT
'Read current AF spectrum resul 'data of the RF signal in the
time domain

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:AM[:ABSolute]:AFSPectrum[:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the AF spectrum result types of the RF signal in the time
domain to be measured simultaneously.

Parameters

Examples:

ADEM:AM:AFSP FSP AVER,MAXH,MINH
'Determine average, maximum and minimum simultaneously

ADEM:AM:AFSP FSP WRIT,OFF,OFF
'Determine only the current measurement results

ADEM:AM:AFSP OFF,OFF,OFF
'Switch off calculation of the AF spectrum

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R&S FS-K7 Remote Control - Description of Commands

<result type>:

WRITe

The current measured values are recorded.

AVERage

The measurement results averaged over the
specified number of measurements are obtained.

MAXHold

The maximum result is determined over the
specified number of measurements.

MINHold

The minimum result is determined over the
specified number of measurements.

#4

Number of digits in the following number of data bytes (= 4 in the
Example)

1024

Number of following data bytes (# of DataBytes, = 1024 in the
Example)

<value x>

4-byte floating point value

Characteristics

*RST values: OFF,OFF,OFF
SCPI: device-specific

[SENSe:]ADEMod:AM[:ABSolute][:TDOMain]:RESult? <result type>

This command reads the result data obtained by AM demodulation depending on
the type indicated as a parameter. The data format of the output data is defined by
the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameters:

Note:
The result type indicated must be one that was configured with the command
[SENSe:]ADEMod:AM[:ABSolute][:TDOMain] [:TYPE]. Otherwise, a query error will
be generated.

Return values:
ASCII format (FORMat ASCII):
In this case, the command will return a list of comma-separated values (CSV) of

the measured values in floating point format. The output unit is dBm (logarithmic
display) or V (linear display).

Binary format (FORMat REAL,32):
In this case, the command will return binary data (Definite Length Block Data

according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
with

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R&S FS-K7 Remote Control - Description of Commands

<result type>:

WRITe

The current measured values are returned.

AVERage

The measurement results averaged over the
specified number of measurements are returned.

MAXHold

The maximum result over the specified number of
measurements is returned.

MINHold

The minimum result over the specified number of
measurements is returned.

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set up demodulator parameters

ADEM:FAM AVER,MAXH,MINH
'Select results to measure

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read average results

ADEM:FM:RES? MAXH
'Read MAXHold results

ADEM:FM:RES? MINH
'Read MINHold results

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:AM:RELative:AFSPectrum:RESult? <result type>

This command reads out the result data of the AF spectrum of the AM­demodulated signal for the specified result type. The format of the output data is
defined using the FORMat command.

Note:
Traces cannot be queried when VIEW is active.
Parameter:

Note:
The specified result type must be one that was configured with the command

[SENSe:]ADEMod:AM:RELative:AFSPectrum[:TYPE]. Otherwise, a query error
will be generated.

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R&S FS-K7 Remote Control - Description of Commands

#4

Number of digits in the following number of data bytes (= 4 in the
Example)

1024

Number of following data bytes (# of DataBytes = 1024 in the Example)

<value x>

4-byte floating point value

Return values:
ASCII format (FORMat ASCII):

In this case, the command will return a list of comma-separated values (CSV) of
the measured values in floating point format. The output unit is dBm (logarithmic
display) or % (linear display).

Binary format (FORMat REAL,32):

In this case, the command will return binary data (Definite Length Block Data
according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
Where

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator

ADEM:FM AVER,MAXH,MINH
'Select the FM results to be measured

ADEM:AM:REL WRIT,OFF,OFF
'Select the AM results to be
'measured

ADEM:AM:REL:AFSP WRIT,OFF,OFF
'Select the AF spectrum results of the 'demodulated AM signal
to be measured

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read FM average value result data

ADEM:FM:RES? MAXH
'Read FM MAXHold result data

ADEM:FM:RES? MINH
'Read FM MINHold result data

ADEM:AM:REL:RES? WRIT
'Read current AM result data

ADEM:AM:REL:AFSP:RES? WRIT
'Read current AF spectrum result data of the demodulated AM

Software Manual 1141.1821.42 - 07 71

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<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over
the specified number of measurements.

MAXHold

The maximum result over the specified
number of measurements is determined.

MINHold

The minimum result over the specified
number of measurements is determined.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

a.

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.
For example, three FM and three PM result types can be activated simultaneously.
If all result types are set to OFF, no AF spectrum of the AM-demodulated signal will be
calculated.
The result type AF spectrum of the AM-demodulated signal cannot be activated
simultaneously with other AF spectra.

signal

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:AM:RELative:AFSPectrum[:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the AF spectrum result types of the AM-demodulated signal
to be measured simultaneously.

Parameter:

Examples:

ADEM:AM:REL:AFSP AVER,MAXH,MINH
'Determine average, maximum and minimum value simultaneously

ADEM:AM:REL:AFSP WRIT,OFF,OFF
'Determine only the current measured values

ADEM:AM:REL:AFSP OFF,OFF,OFF
'Switch off calculation of the AF spectrum

Characteristics

*RST values: OFF,OFF,OFF
SCPI: device-specific

Software Manual 1141.1821.42 - 07 72

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<result type>:

WRITe

The current measured values are returned.

AVERage

The measurement results averaged over the
specified number of measurements are returned.

MAXHold

The maximum result over the specified number of
measurements is returned.

MINHold

The minimum result over the specified number of
measurements is returned.

#4

Number of digits in the following number of data bytes (= 4 in the
Example)

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value

[SENSe:]ADEMod:AM:RELative[:TDOMain]:RESult? <result type>

This command reads out the result data of the AM demodulation for the specified
result type. The format of the output data is defined using the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Note:
The specified result type must be one that was configured with the command
[SENSe:]ADEMod:AM:RELative[:TDOMain][:TYPE]. Otherwise, a query error will
be generated.

Return values:
ASCII format (FORMat ASCII):

In this case, the command will return a list of comma-separated values (CSV) of
the measured values in floating point format. The output unit is %.

Binary format (FORMat REAL,32):
In this case, the command will return binary data (Definite Length Block Data

according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
where

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator

ADEM:FM AVER,MAXH,MINH
'Select FM results to be measured

ADEM:AM:REL WRIT,OFF,OFF
'Select AM results to be measured

ADEM ON
'Switch on demodulator

Software Manual 1141.1821.42 - 07 73

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<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over
the specified number of measurements.

MAXHold

The maximum result over the specified
number of measurements is determined.

MINHold

The minimum result over the specified
number of measurements is determined.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

b.

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated
simultaneously. For example, three FM and three PM result types can be activated
simultaneously
If all result types are set to OFF, the AM demodulator will be switched off.

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read FM average result data

ADEM:FM:RES? MAXH
'Read FM MAXHold result data

ADEM:FM:RES? MINH
'Read FM MINHold result data

ADEM:AM:REL:RES? WRIT
'Read current AM result data

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:AM:RELative[:TDOMain][:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the result types to be measured simultaneously in the case
of AM demodulation.

Parameter:

Examples:

ADEM:AM:REL AVER,MAXH,MIN
'Determine average, maximum and minimum value simultaneously

Software Manual 1141.1821.42 - 07 74

R&S FS-K7 Remote Control - Description of Commands

<result type>:

WRITe

The current measured values are returned.

AVERage

The measurement results averaged over the
specified number of measurements are returned.

MAXHold

The maximum result over the specified number of
measurements is returned.

MINHold

The minimum result over the specified number of
measurements is returned.

#4

Number of digits in the following number of data bytes (= 4 in the

ADEM:AM:REL WRIT,OFF,OFF
'Determine only the current measured values

ADEM:AM:REL OFF,OFF,OFF
'Switch off the AM demodulator

Characteristics

*RST values: WRITe,OFF,OFF
SCPI: device-specific

4.5.3 [SENSe:]ADEMod:FM Subsystem

[SENSe:]ADEMod:FM:AFSPectrum:RESult? <result type>

This command reads out the result data of the AF spectrum of the FM­demodulated signal for the specified result type. The format of the output data is
defined using the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameter:

Note:
The specified result type must be one that was configured with the command
[SENSe:]ADEMod:FM:AFSPectrum[:TYPE]. Otherwise, a query error will be
generated.

Return values:
ASCII format (FORMat ASCII):

In this case, the command will return a list of comma-separated values (CSV) of
the measured values in floating point format. The output unit is dBm (logarithmic
display) or V (linear display).

Binary format (FORMat REAL,32):

In this case, the command will return binary data (Definite Length Block Data
according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
where

Software Manual 1141.1821.42 - 07 75

R&S FS-K7 Remote Control - Description of Commands

Example)

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value
<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator

ADEM:FM AVER,MAXH,MINH
'Select FM results to be measured

ADEM:AM:REL WRIT,OFF,OFF
'Select AM results to be measured

ADEM:FM:AFSP WRIT,OFF,OFF
'Select AF spectrum results of the 'demodulated FM signal to
be 'measured

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read FM average result data

ADEM:FM:RES? MAXH
'Read FM MAXHold result data

ADEM:FM:RES? MINH
'Read FM MINHold result data

ADEM:AM:RES? WRIT
'Read current AM result data

ADEM:FM:AFSP:RES? WRIT
'Read current AF spectrum result data 'of the demodulated FM
signal

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:FM:AFSPectrum[:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the AF spectrum result types of the FM-demodulated signal
to be measured simultaneously.

Parameter:

Software Manual 1141.1821.42 - 07 76

R&S FS-K7 Remote Control - Description of Commands

over the specified number of
measurements.

MAXHold

The maximum result over the specified
number of measurements is determined.

MINHold

The minimum result over the specified
number of measurements is determined.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.

For example, three FM and three PM result types can be activated simultaneously.
If all result types are set to OFF, no AF spectrum of the FM-demodulated signal will be
calculated.
The result type AF spectrum of the FM-demodulated signal cannot be activated
simultaneously with other AF spectra.

<result type>:

IMMediate

The current measurement results are used for
calculating the FM offset.

AVERage

The measurement results averaged over the

Examples:

ADEM:FM:AFSP AVER,MAXH,MINH
'Determine average, maximum and minimum value simultaneously

ADEM:FM:AFSP WRIT,OFF,OFF
'Determine only the current measured values

ADEM:FM:AFSP OFF,OFF,OFF
'Switch off calculation of the AF spectrum

Characteristics

*RST values: OFF,OFF,OFF
SCPI: device-specific

[SENSe:]ADEMod:FM:OFFSet? <result type>

This command calculates the FM offset of the current measured data set.
If averaging has been activated prior to data acquisition (using the command

[SENSe:]ADEMod:FM [:TYPE]), the average FM offset can also be obtained by
setting <result type> = AVERage. The average FM offset obtained in this way
differs from the one calculated by CALC:MARK:FUNC:ADEM:FERR?, since, for
determination of the frequency deviation, the modulation is removed by means of
lowpass filtering, producing results that are different from those obtained by
averaging.

Parameters:

Software Manual 1141.1821.42 - 07 77

R&S FS-K7 Remote Control - Description of Commands

specified number of measurements are used for
calculation of the FM offset.

<result type>:

WRITe

The current trace data is recorded.

AVERage

The measurement results averaged over the
specified number of measurements are obtained.

MAXHold

The maximum result is determined over the specified
number of measurements.

MINHold

The minimum result is determined over the specified
number of measurements.

Note:
If no average measurement has been active during the last measurement
sequence, only the command [SENSe:]ADEMod:FM:OFFSet? IMMediate will
return a valid result (data to calculate the FM offset are taken from the last
measured data set).
[SENSe:]ADEMod:FM:OFFSet? AVERage will cause a query error in this case.

Example

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator to perform '30 measurements

ADEM:FM AVER,OFF,OFF
'Set FM results to perform
'averaging

ADEM:AM OFF,OFF,OFF
'Switch off AM demodulation

ADEM ON
'Switch on FM demodulator

INIT;*WAI
'Start measurement and wait 'for end

ADEM:FM:OFFS? IMM
'Read FM offset of last measurement of the sequence 'of 30

ADEM:FM:OFFS? AVER
'Read FM offset averaged over 30 measurements

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:FM[:TDOMain]:RESult? <result type>

This command reads the result data obtained by FM demodulation depending on
the type indicated as a parameter. The data format of the output data is defined by
the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameter:

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#4

Number of digits (= 4 in the Example) of the following number of data
bytes

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value

Note:
The specified result type must be one that was configured with the command
[SENSe:]ADEMod:FM[:TYPE]. Otherwise, a query error will be generated.

Return values:
ASCII format (FORMat ASCII):

In this case, the command will return a list of comma-separated values (CSV) of
the measured values in floating point format. The output unit is Hz.

Binary format (FORMat REAL,32):

In this case, the command will return binary data (Definite Length Block Data
according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
with

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator 'parameters

ADEM:FM AVER,MAXH,MINH
'Select FM results to measure

ADEM:AM WRIT,OFF,OFF
'Select AM results to measure

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait 'for end

FORM ASC
'Select output format

ADEM:FM:RES? AVER
'Read FM average results

ADEM:FM:RES? MAXH
'Read FM MAXHold results

ADEM:FM:RES? MINH
'Read FM MINHold result data

ADEM:AM:RES? WRIT
'Read current AM results

Software Manual 1141.1821.42 - 07 79

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<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over the
specified number of measurements.

MAXHold

The maximum result is determined over the
specified number of measurements.

MINHold

The minimum result is determined over the
specified number of measurements.

VIEW

The measurement result is frozen on the display,
i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:FM[:TDOMain][:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the result types to be created in parallel by FM
demodulation.

Parameters:

Note:
Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated
simultaneously. For example, three FM and three PM result types can be activated
simultaneously.

The FM demodulator is deactivated by setting all result types to OFF.

Examples:

ADEM:FM AVER,MAXH,MINH
'Determine average, maximum and minimum value simultaneously

ADEM:FM WRIT,OFF,OFF
'Determine only the current measurement result

ADEM:FM OFF,OFF,OFF
'Switch off the FM demodulator

Characteristics

*RST values: WRITe,OFF,OFF
SCPI: device-specific

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4.5.4 [SENSe:]ADEMod:MCPHase Subsystem

[SENSe1]:ADEMod:MCPHase:METHod ORTHogonal|FLATtop

The command selects the method for the multicarrier measurement.

Example

SENS1:ADEM ON
'Switch on Ademod measurementSENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

SENS1:ADEM:MCPH:METH ORTHl
'Select method.

Characteristics

*RST value: ORTH
SCPI: device-specific

[SENSe1]:ADEMod:MCPHase:POLar:RESult?

Multicarrier measurement: query of polar trace irrespective of selected diagram,
Returns list with magnitude/phase pairs.

Example

SENS1:ADEM ON
'Switch on Ademod measurement

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on..

SENS1:ADEM:MCPH:POL:RESult?
'Trace query

Characteristics

*RST value: ­SCPI: device-specific

[SENSe1]:ADEMod:MCPHase:SPACing <numeric_value>

The command enters the carrier spacing of the multicarrier measurement.

Example

SENS1:ADEM ON
'Switch on Ademod measurement

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

SENS1:ADEM:MCPH: SPAC 100KHZ
'Enter spacing.

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<result type>:

WRITe

The current measured values are returned.

AVERage

The measurement results averaged over the specified
number of measurements are returned.

MAXHold

The maximum result over the specified number of
measurements is returned.

MINHold

The minimum result over the specified number of
measurements is returned.

Characteristics

*RST value: ­SCPI: device-specific

[SENSe1]:ADEMod:MCPHase:STATe ON|OFF

The command activates/deactivates the multicarrier phase measurement.

Example

SENS1:ADEM ON
'Switch on Ademod measurement

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on

Characteristics

*RST value: OFF
SCPI: device-specific

4.5.5 [SENSe:]ADEMod:PM Subsystem

[SENSe:]ADEMod:PM:AFSPectrum:RESult? <result type>

This command reads out the result data of the AF spectrum of the PM­demodulated signal for the specified result type. The format of the output data is
defined using the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameter:

Note:
The specified result type must be one that was configured with the command
[SENSe:]ADEMod:PM:AFSPectrum[:TYPE]. Otherwise, a query error will be
generated.

Return values:

ASCII format (FORMat ASCII):

In this case, the command will return a list of comma-separated values (CSV) of
the measured values in floating point format. The output unit is dB (logarithmic
display) or depends on the unit selected - either RAD or DEG (linear display).

Software Manual 1141.1821.42 - 07 82

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#4

Number of digits in the following number of data bytes (= 4 in the
Example)

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value

Binary format (FORMat REAL,32):

In this case, the command will return binary data (Definite Length Block Data
according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
where

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator

ADEM:PM AVER,MAXH,MINH
'Select PM results to be measured

ADEM:AM:REL WRIT,OFF,OFF
'Select AM results to be measured

ADEM:PM:AFSP WRIT,OFF,OFF
'Select AF spectrum results of the 'demodulated PM signal to
be 'measured

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait for end

FORM ASC
'Select output format

ADEM:PM:RES? AVER
'Read PM average result data

ADEM:PM:RES? MAXH
'Read PM MAXHold result data

ADEM:PM:RES? MINH
'Read PM MINHold result data

ADEM:AM:RES? WRIT
'Read current AM result data

ADEM:PM:AFSP:RES? WRIT
'Read current AF spectrum result data 'of the demodulated PM
signal

Characteristics

*RST value: ­SCPI: device-specific

Software Manual 1141.1821.42 - 07 83

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<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over
the specified number of measurements.

MAXHold

The maximum result over the specified
number of measurements is determined.

MINHold

The minimum result over the specified
number of measurements is determined.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

c.

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.
For example, three PM and three PM result types can be activated simultaneously.
If all result types are set to OFF, no AF spectrum of the PM-demodulated signal will be
calculated.
The result type AF spectrum of the PM-demodulated signal cannot be activated
simultaneously with other AF spectra.

[SENSe:]ADEMod:PM:AFSPectrum[:TYPE] <result type 1>,<result type 2>, <result type 3>

This command selects the AF spectrum result types of the PM-demodulated signal
to be measured simultaneously.

Parameter:

Examples:

ADEM:PM:AFSP AVER,MAXH,MINH
'Determine average, maximum and minimum value simultaneously

ADEM:PM:AFSP WRIT,OFF,OFF
'Determine only the current measured values

ADEM:PM:AFSP OFF,OFF,OFF'
Switch off calculation of the AF spectrum

Characteristics

*RST values: OFF,OFF,OFF
SCPI: device-specific

[SENSe:]ADEMod:PM:RPOint[:X] 0s to measurement time

This command determines the position where the phase of the PM-demodulated
signal is set to 0 rad. The maximum possible value depends on the measurement
time selected in the instrument; this value is output in response to the query
ADEM:PM:RPO:X? MAX.

Software Manual 1141.1821.42 - 07 84

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<result type>:

WRITe

The current trace data is recorded.

AVERage

The measurement results averaged over the
specified number of measurements are obtained.

MAXHold

The maximum result is determined over the
specified number of measurements.

MINHold

The minimum result is determined over the
specified number of measurements.

#4

Number of digits (= 4 in the Example) of the following number of data
bytes

1024

Number of following data bytes (# of DataBytes = 1024 in the
Example)

<value x>

4-byte floating point value

Example

ADEM:PM:RPO:X 500us
'Set the position where the phase to 0 rad setting to 500 s.

Characteristics

*RST value 0 s

SCPI: conforming

[SENSe:]ADEMod:PM[:TDOMain]:RESult? <result type>

This command reads the result data obtained by PM demodulation depending on
the type indicated as a parameter. The data format of the output data is defined by
the FORMat command.

Note:
Traces cannot be queried when VIEW is active.

Parameter:

Note:
The specified result type must be one that was configured with the command
[SENSe:]ADEMod:PM[:TYPE]. Otherwise, a query error will be generated.

Return values:
ASCII format (FORMat ASCII):
In this case, the command will return a list of comma-separated values (CSV) of

the measured values in floating point format. The output unit depends on the unit
selected - either RAD or DEG.

Binary format (FORMat REAL,32):
In this case, the command will return binary data (Definite Length Block Data

according to IEEE 488.2), with each measured value formatted in 32-bit IEEE 754
floating point format. The response string will have the following structure:

#41024<value1><value2>...<value n>
with

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<result type 1/2/3>:

WRITe

The current measured values are recorded.

AVERage

The measurement results are averaged over
the specified number of measurements.

MAXHold

The maximum result is determined over the
specified number of measurements.

MINHold

The minimum result is determined over the
specified number of measurements.

VIEW

The measurement result is frozen on the
display, i.e. it is not recalculated in further
measurements.

OFF

The result type is not used.

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Set demodulator 'parameters

ADEM:PM AVER,MAXH,MINH
'Select PM results to measure

ADEM:AM WRIT,OFF,OFF
'Select AM results to measure

ADEM ON
'Switch on demodulator

INIT;*WAI
'Start measurement and wait 'for end

FORM ASC
'Select output format

ADEM:PM:RES? AVER
'Read PM average results

ADEM:PM:RES? MAXH
'Read PM MAXHold results

ADEM:PM:RES? MINH
'Read PM MINHold result data

ADEM:AM:RES? WRIT
'Read current AM results

Characteristics

*RST value: ­SCPI: device-specific

[SENSe:]ADEMod:PM[:TDOMain] [:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the result types to be created in parallel by PM
demodulation.

Parameter:

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R&S FS-K7 Remote Control - Description of Commands

Settings different from OFF can be assigned to only one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.

For example, three PM and three PM result types can be activated simultaneously.
The PM demodulator is deactivated by setting all result types to OFF.

Examples:

ADEM:PM AVER,MAXH,MINH
'Determine average, maximum and minimum value simultaneously

ADEM:PM WRIT,OFF,OFF
'Determine only the current measurement result

ADEM:PM OFF,OFF,OFF'
Switch off the PM demodulator

Characteristics

*RST values: WRITe,OFF,OFF
SCPI: device-specific

4.5.6 [SENSe:]ADEMod:SPECtrum Subsystem

[SENSe:]ADEMod:SPECtrum:BANDwidth|BWIDth[:RESolution] 1 Hz to 10 MHz

This command sets the resolution bandwidth for spectrum represetation that was
determined from the analog demodulation data.
The recording time required is calculated from the and the sampling rate indirectly
set via ADEM:SPEC:SPAN:MAX or ADEM:BAND. If the available recording time is
not sufficient for the given bandwidth, the recording time is set to ist maximum and
the resolution bandwidth is enlarged to the resulting bandwidth.

Example

ADEM ON
'Switches on the FM demodulator
CALC:FEED 'XTIM:SPEC'
'Switches on the result display RF spectrum
or
CALC:FEED 'XTIM:FM:AFSP'
'Switches on the result display AF spectrum of FM
or
CALC:FEED 'XTIM:RFP:AFSP'
'Switches on the result display AF spectrum of RF power signal
ADEM:BAND:RES 61.2kHz
'Sets the resolution bandwidth to 61.2 kHz.

Characteristics

*RST value: 61.2 kHz
SCPI: device-specific

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[SENSe1]:ADEMod:SPECtrum[:MAGNitude]:RESult? WRITe | AVERage| MAXHold | MINHold

This command queries the magnitude trace irrespective of the diagram in the
multicarrier measurement.

Example

SENS1:ADEM ON

'Switch on Ademod measurement.

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:FEED 'XFR:SPEC'
'Magnitude diagram.
SENS1:ADEM:SPEC:TYPE WRIT, OFF, OFF
'Trace mode
SENS1:ADEM:SPEC: RESult? WRIT
'Trace query

Characteristics

*RST value: ­SCPI: device-specific

[SENSe1]:ADEMod:SPECtrum[:MAGNitude]:TYPE WRITe | AVERage | MAXHold | MINHold | VIEW | OFF, WRITe | AVERage | MAXHold | MINHold | VIEW | OFF, WRITe | AVERage | MAXHold | MINHold | VIEW | OFF

This command sets the trace mode for magnitude in the multicarrier measurement.

Example

SENS1:ADEM ON
'Switch on Ademod measurement

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.
CALC1:FEED 'XFR:SPEC'
'Magnitude diagram.

SENS1:ADEM:SPEC:TYPE WRIT, OFF, OFF
'Trace mode

Characteristics

*RST value: ­SCPI: device-specific

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R&S FS-K7 Remote Control - Description of Commands

[SENSe1]:ADEMod:SPECtrum:PHASe:RESult? WRITe | AVERage| MAXHold | MINHold

This command queries the phase trace irrespective of the diagram in the
multicarrier measurement.

Example

SENS1:ADEM ON
'Switch on Ademod measurement

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:FEED 'XFR:PHAS'
'Phase diagram.
SENS1:ADEM:SPEC:PHAS:TYPE WRIT, OFF, OFF
'Trace mode
SENS1:ADEM:SPEC:PHAS: RES? WRIT
'Trace query

Characteristics

*RST value: ­SCPI: device-specific

[SENSe1]:ADEMod:SPECtrum:PHASe:TYPE WRITe | AVERage | MAXHold | MINHold | VIEW | OFF, WRITe | AVERage | MAXHold | MINHold | VIEW | OFF, WRITe | AVERage | MAXHold | MINHold | VIEW | OFF

This command sets the trace mode for phase in the multicarrier measurement.

Example

SENS1:ADEMod ON
'Switch on Ademod measurement.

SENS1:ADEM:MCPH:STAT ON
'Multicarrier measurement on.

CALC1:FEED 'XFR:PHAS'
'Phase diagram.

SENS1:ADEM:SPECtrum:PHASe:TYPE WRIT, OFF, OFF
'Trace mode

Characteristics

*RST value: ­SCPI: device-specific

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R&S FS-K7 Remote Control - Description of Commands

<result type>:

WRITe

The current measurement results will be obtained

AVERage

The measurement results will be averaged over
the given # of measurements

MAXHold

The maximum result values will be obtained over
the given # of measurements

MINHold

The minimum result values will be obtained over
the given # of measurements

#4

number of digits (= 4 in the Example) of the following number of data
bytes

1024

number of following data bytes (= 1024 in the Example)

<value x>

4-Byte-Floating Point Value

[SENSe:]ADEMod:SPECtrum:RESult? <result type>

This command reads the result data obtained by RF SPECtrum measurement
depending on the type indicated as a parameter. The data format of the output
data block is defined by the FORMat command.

Note:
It is not possible to read out trace data when result type VIEW is selected.
Parameters:

Note:
The result type indicated must be one of those configured by

[SENSe:]ADEMod:SPEC[:TYPE]. Otherwise a query error will be generated.
Return Values:
ASCII Format (FORMat ASCII):
In this case the command will yield a list of comma separated values (CSV) of the

measured values in floating point format. The output unit is dBm.
Binary Format (FORMat REAL,32):
In this case the command will yield binary data (Definite Length Block Data

according to IEEE 488.2), each measurement value being formatted in 32 Bit IEEE
754 Floating-Point-Format. The schematics of the result string will be as follows:

#41024<value1><value2>...<value n>
with

Examples:

ADEM:SET 8MHz,32000,EXT,POS,-500,30
'Sets up demodulator parameters

ADEM:SPEC AVER,MAXH,MINH
'Sets up RF spectrum results to measure

ADEM:SPEC WRIT,OFF,OFF
'Sets up AM results to measure

ADEM ON
'Switches on demodulator

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R&S FS-K7 Remote Control - Description of Commands

INIT;*WAI
'Starts measurement and waits for sync

FORM ASC
'Selects output format

ADEM:SPEC:RES? AVER
'Reads RF spectrum average results

ADEM:SPEC:RES? MAXH
'Reads RF spectrum max hold results

ADEM:SPEC:RES? MINH
'Reads RF spectrum min hold results

ADEM:SPEC:RES? WRIT
'Reads spectrum current results

Characteristics

*RST values: ­SCPI: device-specific

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R&S FS-K7 Remote Control - Description of Commands

Span

Sampling rate

Comment

120 MHz

256 MHz

with R&S FSQ-B72 only

50 MHz/85 MHz (1)

128 MHz

with R&S FSQ-B72 only

30 MHz

64 MHz

with R&S FSQ only

18 MHz

32 MHz

with R&S FSQ only

10 MHz

32 MHz

8 MHz

16 MHz

This restriction only applies to R&S FSP and R&S FSU without B72:
This filter is only flat for approx. 6 MHz; it has a 3 dB decay at 7 MHz.

5 MHz

8 MHz

3 MHz

4 MHz

1,6 MHz

2 MHz

800 kHz

1 MHz

400 kHz

500 kHz

200 kHz

250 kHz

100 kHz

125 kHz

50 kHz

62.5 kHz

25 kHz

31.25 kHz

12.5 kHz

15.625 kHz

6.4 kHz

7.8125 kHz

3.2 kHz

3.90625 kHz

1.6 kHz

1.953125 kHz

800 Hz

976.5625 Hz

400 Hz

488.28125 Hz

200 Hz

244.140625 Hz

100 Hz

122.0703125 Hz

[SENSe:]ADEMod:SPECtrum:SPAN[:MAXimum] <numeric_value>

This command sets the maximum frequency range for displaying the RF spectrum
that was determined from the FM demodulation data. The maximum span
corresponds to the measurement bandwidth of analog demodulation
(SENS:ADEM:BAND).

(1) The demodulation bandwidth at a sampling rate of 128 MHz depends on the center frequency that has

been set. At a center frequency of =3.6 GHz, the demodulation bandwidth is 50 MHz; at higher center
frequencies, it is 85 MHz.

Example

ADEM ON"
'Switches on the FM demodulator

CALC:FEED 'XTIM:SPEC'
'Switches on result display RF spectrum

ADEM:SPEC:SPAN:MAX 5 MHz
'Sets the max. span to 5 MHz

ADEM:SPEC:SPAN:ZOOM 1 MHz
'Sets the displayed span to 1 MHz

Characteristics

*RST value: 5 MHz
SCPI: device-specific

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R&S FS-K7 Remote Control - Description of Commands

<result type 1/2/3>.

WRITe

The current measurement results will be
obtained

AVERage

The measurement results will be averaged
over the given # of measurements

MAXHold

The maximum result values will be obtained
over the given # of measurements

MINHold

The minimum result values will be obtained
over the given # of measurements

VIEW

The measurement results are frozen and
displayed, i.e. they are not calculated for
subsequent measurements.

OFF

The result type will not be used.

Each value besides OFF can only be assigned to one result type at a time.
Together with other signals, a maximum of six traces can be activated simultaneously.

For example, three FM and three PM result types can be activated simultaneously.
If all result types are set to OFF, switch off calculation of the AF spectrum.

[SENSe:]ADEMod:SPECtrum:SPAN:ZOOM <numeric_value>

This command sets the frequency range for result display of RF spectrum
determined from FM demodulation data. The frequency range for result display is
limited to the maximum span (SENS:ADEM:SPEC:SPAN:MAX) or to the
measurement bandwidth of analog demodulation (SENS:ADEM:BAND).

Example

ADEM ON
'Switches on the FM demodulator

CALC:FEED 'XTIM:SPEC'
'Switches on result display RF spectrum"
ADEM:SPEC:SPAN:MAX 5 MHz
'Sets the maximum span to 5 MHz

ADEM:SPEC:SPAN:ZOOM 1 MHz
'Sets displayed span to 1 MHz

Characteristics

*RST value: 5 MHz
SCPI: device-specific

[SENSe:]ADEMod:SPECtrum[:TYPE] <result type 1>,<result type 2>,<result type 3>

This command selects the result types to be created in parallel by the RF
SPECtrum measurement with active analog demodulation.

Parameters:

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R&S FS-K7 Remote Control - Description of Commands

Rounded off

demodulation bandwidth

Sampling rate

Comment

120 MHz

256 MHz

with R&S FSQ-B72 only

50/85 MHz (1)

128 MHz

with R&S FSQ-B72 only

30 MHz

64 MHz

with R&S FSQ only

18 MHz

32 MHz

with R&S FSQ only

10 MHz

32 MHz

8 MHz

16 MHz

This restriction only applies to R&S FSP and R&S

FSU without B72: This filter is only flat for approx. 6

MHz; it has a 3 dB decay at 7 MHz.

5 MHz

8 MHz 3 MHz

4 MHz 1.6 MHz

2 MHz 800 kHz

1 MHz 400 kHz

500 kHz 200 kHz

250 kHz 100 kHz

125 kHz 50 kHz

62.5 kHz 25 kHz

31.25 kHz

12.5 kHz

15.625 kHz

6.4 kHz

7.8125 kHz

3.2 kHz

3.90625 kHz

1.6 kHz

1.953125 kHz

800 Hz

976.5625 Hz

400 Hz

488.28125 Hz

200 Hz

244.140625 Hz

100 Hz

122.0703125 Hz

Examples

ADEM:SPEC AVER,MAXH,MINH
'Creates average, max hold and min hold values at a time

ADEM:SPEC WRIT,OFF,OFF
'Only creates the current measurement values

ADEM:SPEC OFF,OFF,OFF
'Switches FM demodulation off

Characteristics

*RST values: OFF,OFF,OFF
SCPI: device-specific

4.5.7 [SENSe:]BANDwidth Subsystem

This subsystem controls the setting of the analyzer’s filter bandwidths. Both groups of
commands (BANDwidth and BWIDth) perform the same functions.

[SENSe<1|2>:]BANDwidth|BWIDth:DEMod <numeric_value>

This command sets the bandwidth for analog demodulation. Depending on the selected
demodulation bandwidth, the instrument selects the required sampling rate. The available
values of the demodulation bandwidths are determined by the sampling rates.

(1) The demodulation bandwidth at a sampling rate of 128 MHz depends on the center frequency that

has been set. At a center frequency of =3.6 GHz, the demodulation bandwidth is 50 MHz; at higher
center frequencies, it is 85 MHz

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R&S FS-K7 Remote Control - Description of Commands

Instrument

IF bandwidth

Steps

R&S FSP

300 kHz to 10 MHz

1,3,10

R&S FSU

200 kHz to 10 MHz

1,2,3,5,10

R&S FSQ

200 kHz to 50 MHz

1,2,3,5,10

Example

ADEM:BAND:DEM 1MHz

'Set test bandwidth to 1 MHz

Characteristics

*RST value: 5 MHz
SCPI: device-specific

[SENSe<1|2>:]BANDwidth|BWIDth[:RESolution] <numeric_value>

This command sets the IF bandwidth of the demodulator.

Analog resolution filters are available that are implemented as LC filters with four
circuits (R&S FSP) or 5 circuits (R&S FSU/R&S FSQ).

If the resolution bandwidth is modified, coupling to the demodulation bandwidth is
automatically switched off.

Example

BAND 1MHz
'Set IF bandwidth to 1 MHz

Characteristics

*RST value: - (AUTO is set to ON)
SCPI: conforming

[SENSe<1|2>:]BANDwidth|BWIDth[:RESolution]:AUTO ON | OFF

This command automatically couples the IF bandwidth to the demodulation
bandwidth
(BW

= 10 * BW

RBW

Demod

).

Example

BAND:AUTO OFF
'Switch off coupling of the IF bandwidth to the demodulation
bandwidth

Characteristics

*RST value: ON
SCPI: conforming

Software Manual 1141.1821.42 - 07 95