Rohde & Schwarz FSMR User Manual
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Rohde & Schwarz FSMR User Manual

Rohde & Schwarz FSMR User Manual

Measuring receiver
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Product: Measuring Receiver FSMR
Measurement Examples with the
Measuring Receiver R&S FSMR
Product Note
This product note provides information about the basic measurement setups. Measurement examples show
the practical realisation of measurements like RF Power, Tuned RF Level and Demodulation. Some hints
for low power measurement are given.
1166.3311.12-01
I-1.1
E-1

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Summary of Contents for Rohde & Schwarz FSMR

  • Page 1 Product: Measuring Receiver FSMR Measurement Examples with the Measuring Receiver R&S FSMR Product Note This product note provides information about the basic measurement setups. Measurement examples show the practical realisation of measurements like RF Power, Tuned RF Level and Demodulation. Some hints for low power measurement are given.

  • Page 2: Table Of Contents

    Content - Getting Started FSMR Contents - "Getting Started" 1 Getting Started ....................1.1 Instrument overview ........................1.1 Setup the instruments........................1.1 Select the Preset state ........................1.2 Measurement Examples........................1.3 Example 1: RF Power Measurements with a Power Sensor ...........1.4 Measurement .........................1.4 Main Receiver Functions....................1.4 Measurement Setup.......................1.4...

  • Page 3: Getting Started

    This chapter provides a fast introduction to operation by guiding the user step by step through measurement examples . Before starting any measurement with the FSMR, please note the instructions given in chapter 1 of the users manual for putting the instrument into operation. In chapter 3 you will find detailed information on customizing the instrument and the display.

  • Page 4: Select The Preset State

    Select the Preset state FSMR Select the Preset state All of the following examples assume the standard settings for the measuring receiver. These are set with the PRESET key. The PRESET must be set to Factory default values and measuring Receiver Mode.

  • Page 5: Measurement Examples

    FSMR Measurement Examples Fig.1-1 Display after selecting the default setup in receiver mode The main default parameters are listed in the following table: Table 1-1 Default parameters after preset in measuring recveiver mode Parameter Parameter Name Value Receiver frequency Frequency...

  • Page 6: Example 1: Rf Power Measurements With A Power Sensor

    Example 1: RF Power Measurements with a Power Sensor Measurement The FSMR includes a power meter functionality. Measurements of RF Power will be performed in the power meter mode with highest accuracy. The FSMR will automatically handle all required correction factors and compensate the measurements.
  • Page 7 FSMR Measurement Examples Zero the Power Sensor Reset the instrument. PRESET Press the PRESET key. The main receiver menu is opened. The receiver mode is set. Switching to Power Meter Mode PWR METER Press the PWR METER hotkey. The power meter menu is displayed.
  • Page 8 Measurement Examples FSMR Fig.1-3 RF power measurement after Zeroing Measure the RF power in Watt Connect the power sensor to the signal generator RF output Linear display – Change the Unit to Watt PWR METER Press the PWR METER hotkey.

  • Page 9: Example 2: Low Rf Level Measurements With Tuned Rf Level Mode

    Measurement The main functionality of a measuring receiver is the RF level measurement. Measurements of low power RF signals will be performed in the Tuned RF Level mode with highest accuracy. The FSMR will automatically handle all required settings. Main Receiver Functions The measurement of RF levels over a wide input level range is performed in three different level ranges.
  • Page 10 In the message box, confirm CONTINUE and press ENTER. In the next step of the calibration the receiver is connected to the source. Connect FSMR RF input to the signal generator RF output In the next message box, confirm CONTINUE and press ENTER. 1166.3311.12-01...
  • Page 11 FSMR Measurement Examples The FSMR is now calibrated in one RF level range (the upper level range does handle RF levels from -10 dBm to +30 dBm). Measurements in this level range can now performed with full accuracy. Fig.1-6 Tuned RF Level measurement after calibration...
  • Page 12 Observe the FSMR screen for the yellow RECAL message to re- appear again (at levels about -50 dBm). As soon as the RECAL flag appears, the FSMR is ready for a next RF LEVEL RF level range change. The calibration of the level difference due to the range change will be performed.
  • Page 13 The following settings are used on the generator: Change the signal generator RF Level to -110 dBm). The FSMR is now performing a calibrated measurement at – 110 RF LEVEL dBm. The reading will be flickering due to a low signal to noise ratio.
  • Page 14 In the RECEIVER FREQUENCY entry window key in “100 MHZ”. The measurement of an unstable signal requires the measuring DETECTOR receiver to use a wide bandwidth. The FSMR offers a wideband WIDE detector mode to acquire wideband signals with high accuracy In the RF LEVEL menu press the DETECTOR WIDE softkey.

  • Page 15: Example 3: Am Modulation And Modulation Distortion Measurements

    Example 3: AM Modulation and Modulation Distortion Measurements Measurement The FSMR includes a modulation analyzer. Measurements like AM, FM or PM modulation will be performed in the modulation analyzer mode. The instrument offers standard measurements like modulation depth, deviation and modulation frequency, but also more sophisticated function like modulation distortion or audio frequency response are available.
  • Page 16 Measurement Examples FSMR Measure the AM modulation depth PRESET Reset the instrument. Press the PRESET key. The main receiver menu is opened. The receiver mode is set. Switching to AM demodulation DEMOD Press the DEMOD hotkey. The analog demodulation menu is displayed.
  • Page 17 FSMR Measurement Examples 2. Relative Audio measurements – audio frequency response DEMOD Press the DEMOD hotkey. The analog demodulation menu is displayed. In the DEMOD menu press the RELATIVE softkey. The RELATIVE menu is displayed.In the relative menu, only the...
  • Page 18 Measurement Examples FSMR 3. Measure the harmonic distortion - Choosing the detector DEMOD Press the DEMOD hotkey. In the DEMOD menu press the DETECTOR SELECTION softkey. The DETECTOR SELECTION menu is displayed The instrument is equipped with a wide range of detectors for DETECTOR measuring modulation signals.

  • Page 19: Example 4: Audio Measurements With The Audio Analyzer Mode

    Example 4: Audio Measurements with the Audio Analyzer mode Measurement The FSMR includes an audio analyzer functionality. Measurements of audio signals will be performed in the audio analyzer mode with highest accuracy. The FSMR will automatically handle all required settings.
  • Page 20 Measurement Examples FSMR Reset the instrument. PRESET Press the PRESET key. The main receiver menu is opened. The receiver mode is set. Switching to Audio Mode AUDIO Press the AUDIO hotkey. The audio menu is displayed. The audio measurement results are displayed in parallel, no further settings like frequency is required.
  • Page 21 FSMR Measurement Examples Limiting the bandwidth - Audio Filters AUDIO Press the AUDIO hotkey. The audio menu is displayed. In the AUDIO menu press the FILTER softkey. The audio filter menu is displayed. To suppress unwanted FILTER broadband noise or harmonics of the signal, the bandwidth of the measurement can be limited with higpass and lowpass filters.

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