R&S NRX-B4 User manual

R&S®NRX
Power Meter
User Manual
User Manual
Version 05
1178556602
(;ÜÅÐ2)

This manual describes the R&S®NRX (1424.7005.02) with firmware version FW 02.20 and later.
In addition to the base unit, the following options are described:
●R&S®NRX-B1 (1424.7805.02)
●R&S®NRX-B4 (1424.8901.02)
●R&S®NRX-B8 (1424.8301.02)
●R&S®NRX-B9 (1424.8601.02)
●R&S®NRX-K2 (1424.9208.02)
●R&S®NRX-K4 (1424.9308.02)
© 2019 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
Email: [email protected]
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1178.5566.02 | Version 05 | R&S®NRX
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol , e.g. R&S®NRX is indicated as
R&S NRX.

Contents
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Contents
1 Preface.................................................................................................. 11
1.1 Documentation Overview........................................................................................... 11
1.1.1 Getting Started Manual..................................................................................................11
1.1.2 User Manuals and Help.................................................................................................11
1.1.3 Tutorials.........................................................................................................................11
1.1.4 Basic Safety Instructions............................................................................................... 11
1.1.5 Data Sheets and Brochures.......................................................................................... 11
1.1.6 Release Notes and Open Source Acknowledgment (OSA).......................................... 12
1.1.7 Application Notes, Application Cards, White Papers, etc..............................................12
1.2 Key Features................................................................................................................12
2 Safety Information................................................................................13
3 Instrument Tour....................................................................................14
3.1 Front Panel Tour..........................................................................................................14
3.1.1 Sensor Connector A and B........................................................................................... 14
3.1.2 Module Bay................................................................................................................... 14
3.1.3 Touchscreen..................................................................................................................16
3.1.4 Keys.............................................................................................................................. 16
3.1.5 USB Host Interface....................................................................................................... 18
3.1.6 On/Standby Key............................................................................................................ 18
3.2 Rear Panel Tour...........................................................................................................19
3.2.1 Trig In / Out 2 and Out 1 / Trig Out Connectors............................................................ 19
3.2.2 Ethernet Interface..........................................................................................................20
3.2.3 USB Device Interface....................................................................................................20
3.2.4 USB Host Interface....................................................................................................... 20
3.2.5 AC Supply and Power Switch....................................................................................... 20
3.2.6 IEC 625/IEEE 488 Interface.......................................................................................... 20
3.2.7 Sensor Connectors C and D......................................................................................... 21
4 Preparing for Use.................................................................................22
4.1 Unpacking and Checking........................................................................................... 22
4.1.1 Accessory List............................................................................................................... 22

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4.2 Operating Conditions................................................................................................. 22
4.3 Important Aspects for Test Setup..............................................................................23
4.4 Placing on a Bench Top..............................................................................................23
4.5 Mounting in a Rack..................................................................................................... 25
4.6 Connecting to the AC Power Supply.........................................................................25
4.7 Switching On or Off.................................................................................................... 25
4.8 Connecting Power Sensors....................................................................................... 26
4.8.1 Sensor Connectors A to D............................................................................................ 26
4.8.2 Optional Sensor Interface for R&S NRT (R&S NRX-B9)...............................................27
4.8.3 LAN Interface................................................................................................................ 27
4.8.4 USB 2.0 Host Interfaces................................................................................................27
4.9 Connecting USB and External Devices.....................................................................28
5 Operating Concepts.............................................................................29
5.1 Manual Operation........................................................................................................29
5.1.1 Start Dialog................................................................................................................... 29
5.1.2 Main Measurement Dialog............................................................................................ 30
5.1.3 Status Information......................................................................................................... 32
5.1.4 Notification Center.........................................................................................................33
5.1.5 Selecting the Display Layout.........................................................................................34
5.1.6 Swapping Measurement Panes.................................................................................... 36
5.1.7 Editing Parameters........................................................................................................37
5.1.8 Creating and Saving Screenshots.................................................................................38
5.2 Remote Operation....................................................................................................... 38
5.3 Remote Control........................................................................................................... 39
5.3.1 Switching to Remote Control (REMOTE)......................................................................40
5.3.2 Returning to Manual Operation (LOCAL)......................................................................40
6 Measurement Basics........................................................................... 41
6.1 Parallel Measurements............................................................................................... 41
6.2 Sensor Assignment and Memory.............................................................................. 41
6.3 Performing a Measurement........................................................................................43
6.4 Limit Violation..............................................................................................................44
6.5 Settings Conflict..........................................................................................................44

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7 Configuration for All Measurement Types.........................................46
7.1 Display Settings.......................................................................................................... 46
7.2 Controlling the Measurement.................................................................................... 53
7.2.1 Controlling the Measurement Results........................................................................... 53
7.3 Triggering.....................................................................................................................54
7.3.1 Trigger States................................................................................................................54
7.3.2 Trigger Sources.............................................................................................................54
7.3.3 Dropout Time.................................................................................................................55
7.3.4 Hold-Off Time................................................................................................................ 56
7.3.5 Trigger Settings.............................................................................................................56
7.4 Measurement Settings Dialog....................................................................................60
8 Measurement Types and Result Displays..........................................63
8.1 Continuous Average................................................................................................... 63
8.1.1 Continuous Average Result Display..............................................................................63
8.1.2 Continuous Average Settings........................................................................................64
8.2 Burst Average..............................................................................................................65
8.2.1 Burst Average Result Display........................................................................................66
8.2.2 Burst Average Settings..................................................................................................66
8.3 Trace.............................................................................................................................67
8.3.1 Trace Result Display..................................................................................................... 67
8.3.2 Trace Settings............................................................................................................... 67
8.3.3 Trace Marker Dialog......................................................................................................69
8.4 Pulse Analysis.............................................................................................................72
8.4.1 Pulse Analysis Result Display.......................................................................................73
8.4.2 Pulse Analysis Settings.................................................................................................73
8.4.3 Pulse Analysis Dialog....................................................................................................74
8.5 Time Gate.....................................................................................................................80
8.5.1 Time Gate Result Display..............................................................................................80
8.5.2 Time Gate Settings........................................................................................................82
8.5.3 Gate Configuration Dialog.............................................................................................84
8.6 Timeslot........................................................................................................................85
8.6.1 Timeslot Result Display.................................................................................................86
8.6.2 Timeslot Settings...........................................................................................................88

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8.6.3 Timeslot Configuration Dialog....................................................................................... 89
8.7 Statistics...................................................................................................................... 91
8.7.1 Statistics Result Display................................................................................................91
8.7.2 Statistics Settings..........................................................................................................93
8.7.3 Measurement Settings Dialog....................................................................................... 93
8.7.4 Scale Configuration Dialog............................................................................................95
8.7.5 Statistics Timing Dialog.................................................................................................96
8.8 NRT...............................................................................................................................98
8.8.1 NRT Result Display.......................................................................................................98
8.8.2 NRT Settings.................................................................................................................99
8.8.3 Measurement Main Configuration Dialog....................................................................103
9 Sensor Configuration........................................................................ 104
9.1 Mode Settings............................................................................................................104
9.2 Correction Settings...................................................................................................108
9.3 Filter Settings.............................................................................................................111
9.4 Range Settings.......................................................................................................... 115
9.5 For NRT Measurement Type.....................................................................................117
9.5.1 NRT Mode Settings..................................................................................................... 118
9.5.2 NRT Correction Settings..............................................................................................119
9.5.3 NRT Filter Settings......................................................................................................121
10 Saving and Recalling Settings..........................................................123
11 Zeroing Sensors.................................................................................125
12 System Settings................................................................................. 127
12.1 Connections.............................................................................................................. 127
12.1.1 Network Settings......................................................................................................... 128
12.1.2 Remote Settings..........................................................................................................131
12.1.3 Input/Output Settings (I/O).......................................................................................... 134
12.1.4 Sensor Manager..........................................................................................................139
12.2 Instrument Info.......................................................................................................... 142
12.2.1 System Info................................................................................................................. 143
12.2.2 Security Settings......................................................................................................... 146
12.2.3 Options Settings..........................................................................................................149

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12.2.4 Open Source Licenses................................................................................................152
12.3 Hardware Configuration........................................................................................... 153
12.4 Test............................................................................................................................. 153
12.5 Global Settings..........................................................................................................154
13 Firmware Update................................................................................156
13.1 Firmware Update via PC and USB or Ethernet Connection.................................. 156
13.1.1 Hardware and Software Requirements....................................................................... 156
13.1.2 Preparing an Update................................................................................................... 157
13.1.3 Updating the Application Firmware............................................................................. 158
13.2 Firmware Update via a USB Flash Memory Stick...................................................161
13.2.1 Hardware and Software Requirements....................................................................... 161
13.2.2 Preparing an Update................................................................................................... 161
13.2.3 Updating the Application Firmware............................................................................. 162
14 Remote Control Commands..............................................................163
14.1 Conventions Used in SCPI Command Descriptions..............................................163
14.2 Common Commands................................................................................................ 163
14.3 Starting and Ending a Measurement.......................................................................172
14.4 Measurement Settings and Results........................................................................ 175
14.4.1 Configuring the Display............................................................................................... 175
14.4.1.1 General Settings......................................................................................................... 176
14.4.1.2 Scaling........................................................................................................................ 182
14.4.1.3 Units............................................................................................................................ 188
14.4.1.4 Limits...........................................................................................................................190
14.4.1.5 Result Formats and Screenshots................................................................................205
14.4.2 Configuring the Trigger................................................................................................206
14.4.3 Selecting the Measurement........................................................................................ 215
14.4.4 Selecting the Power Sensor........................................................................................218
14.4.5 Continuous Average....................................................................................................219
14.4.6 Trace........................................................................................................................... 221
14.4.6.1 Trace Measurement Settings...................................................................................... 221
14.4.6.2 Combining Trace Commands......................................................................................223
14.4.6.3 Using Markers............................................................................................................. 224
14.4.7 Pulse Analysis.............................................................................................................231

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14.4.8 Time Gate....................................................................................................................245
14.4.9 Timeslot.......................................................................................................................247
14.4.10 Statistics......................................................................................................................250
14.4.10.1 Statistics Measurement Settings.................................................................................250
14.4.10.2 Combining Statistics Commands................................................................................ 253
14.4.10.3 Scaling........................................................................................................................ 254
14.4.10.4 Using Markers............................................................................................................. 258
14.4.11 NRT.............................................................................................................................259
14.4.12 Querying Measurement Results..................................................................................269
14.5 Calculation Functions...............................................................................................270
14.5.1 Selecting a Calculation Function.................................................................................270
14.5.2 Using a Calculation Function...................................................................................... 272
14.5.2.1 Continuous Average Calculation Functions................................................................ 272
14.5.2.2 Continuous Average Calculation Functions with Buffering..........................................278
14.5.2.3 Burst Average Calculation Functions.......................................................................... 285
14.5.2.4 Timeslot Calculation Functions................................................................................... 293
14.6 Configuring Sensors.................................................................................................301
14.6.1 Setting the Frequency................................................................................................. 302
14.6.2 Sensor Ports............................................................................................................... 303
14.6.3 Sensor Modes............................................................................................................. 304
14.6.4 Sensor Corrections..................................................................................................... 308
14.6.5 Sensor Filters.............................................................................................................. 312
14.6.6 Sensor Ranges........................................................................................................... 320
14.6.7 LAN Power Sensors....................................................................................................323
14.6.8 For NRT Measurement Type.......................................................................................326
14.6.8.1 NRT Mode Settings.....................................................................................................326
14.6.8.2 NRT Correction Settings............................................................................................. 329
14.6.8.3 NRT Filter Settings......................................................................................................331
14.7 Configuring the Test Generator............................................................................... 334
14.8 Configuring the Analog Signal Ouput and the Trigger Output............................. 335
14.9 Zeroing....................................................................................................................... 343
14.10 Running Selftests......................................................................................................345
14.11 Managing Setups and Correction Tables................................................................346

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14.12 System Information and Configuration...................................................................353
14.12.1 Presetting.................................................................................................................... 353
14.12.2 Shutdown and Reboot.................................................................................................353
14.12.3 Firmware Update.........................................................................................................354
14.12.4 Network Settings......................................................................................................... 355
14.12.5 Remote Settings..........................................................................................................359
14.12.6 Instrument Information................................................................................................ 362
14.12.7 Sensor Information......................................................................................................363
14.12.8 Date and Time Settings...............................................................................................364
14.12.9 Standardized Signal Configuration..............................................................................367
14.12.10 Error Messages...........................................................................................................369
14.12.11 Locking........................................................................................................................371
14.13 Using the Status Register........................................................................................ 371
14.13.1 General Status Register Commands.......................................................................... 372
14.13.2 Reading Out the CONDition Part................................................................................ 372
14.13.3 Reading Out the EVENt Part.......................................................................................373
14.13.4 Controlling the ENABle Part........................................................................................373
14.13.5 Controlling the Negative Transition Part......................................................................374
14.13.6 Controlling the Positive Transition Part....................................................................... 374
14.14 R&S NRP2 Compatibility.......................................................................................... 375
14.14.1 CALCulate Commands............................................................................................... 375
14.14.2 DISPlay Commands....................................................................................................376
14.14.3 OUTPut Commands....................................................................................................382
14.14.4 SENSe Commands..................................................................................................... 383
15 Remote Control Basics......................................................................414
15.1 Remote Control Interfaces and Protocols.............................................................. 414
15.1.1 USB Interface..............................................................................................................414
15.1.2 Ethernet Interface........................................................................................................415
15.1.2.1 VISA Resource Strings............................................................................................... 416
15.1.2.2 VXI-11 Protocol........................................................................................................... 417
15.1.2.3 HiSLIP Protocol...........................................................................................................417
15.1.2.4 Socket Communication............................................................................................... 418
15.1.3 GPIB Interface.............................................................................................................418

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15.2 SCPI Command Structure........................................................................................ 418
15.2.1 Syntax for Common Commands................................................................................. 419
15.2.2 Syntax for Device-Specific Commands.......................................................................419
15.2.3 SCPI Parameters........................................................................................................ 420
15.2.4 Overview of Syntax Elements..................................................................................... 423
15.2.5 Structure of a Command Line..................................................................................... 423
15.2.6 Responses to Queries.................................................................................................424
Glossary: List of Abbreviations........................................................426
List of Commands..............................................................................428
Index....................................................................................................447

Preface
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1 Preface
This chapter provides safety related information and an introduction to the R&S NRX.
1.1 Documentation Overview
This section provides an overview of the R&S NRX user documentation. Unless speci-
fied otherwise, you find the documents on the R&S NRX product page at:
www.rohde-schwarz.com/manual/NRX
1.1.1 Getting Started Manual
Introduces the R&S NRX and describes how to set up and start working with the prod-
uct. A printed version is delivered with the instrument.
1.1.2 User Manuals and Help
Contains the description of all instrument modes and functions. It also provides an
introduction to remote control, a complete description of the remote control commands
with programming examples, and information on maintenance, instrument interfaces
and error messages. Includes the contents of the getting started manual .
1.1.3 Tutorials
Tutorials offer guided examples and demonstrations on operating the R&S NRX. They
are provided on the product page of the internet.
1.1.4 Basic Safety Instructions
Contains safety instructions, operating conditions and further important information.
The printed document is delivered with the instrument.
1.1.5 Data Sheets and Brochures
The data sheet contains the technical specifications of the R&S NRX. It also lists the
firmware applications and their order numbers, and optional accessories.
The brochure provides an overview of the instrument and deals with the specific char-
acteristics.
See www.rohde-schwarz.com/brochure-datasheet/NRX
Documentation Overview

Preface
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1.1.6 Release Notes and Open Source Acknowledgment (OSA)
The release notes list new features, improvements and known issues of the current
firmware version, and describe the firmware installation.
The open source acknowledgment document provides verbatim license texts of the
used open source software.
See www.rohde-schwarz.com/firmware/NRX
1.1.7 Application Notes, Application Cards, White Papers, etc.
These documents deal with special applications or background information on particu-
lar topics.
See www.rohde-schwarz.com/application/NRX
1.2 Key Features
The R&S NRX supports:
●Easy RF power measurements
●Multi-channel measurements
●RF pulse analysis
●System integration
The R&S NRX is a versatile, user-friendly base unit.
●Straightforward numerical and graphical display of measured values, plus intuitive
operation with touchscreen-based graphical user interface
●Supports up to four R&S NRP and R&S NRQ6 power sensors.
●Supports all sensor-dependent measurement functions
●Hardware interfaces for remote control and triggering
●Code emulation of the R&S NRP2
●Optional high-precision CW and pulse mode reference source module
●Optional power reflection measurements with R&S NRT directional power sensors
See also the R&S NRX fact sheet at www.rohde-schwarz.com.
Key Features

Safety Information
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2 Safety Information
The product documentation helps you use the R&S NRX safely and efficiently. Follow
the instructions provided here and in the printed "Basic Safety Instructions". Keep the
product documentation nearby and offer it to other users.
Intended use
The R&S NRX is intended for the development, production and verification of elec-
tronic components and devices in industrial, administrative, and laboratory environ-
ments. Use the R&S NRX only for its designated purpose. Observe the operating con-
ditions and performance limits stated in the data sheet.
Where do I find safety information?
Safety information is part of the product documentation. It warns you about the poten-
tial dangers and gives instructions how to prevent personal injuries or damage caused
by dangerous situations. Safety information is provided as follows:
●The printed "Basic Safety Instructions" provide safety information in many lan-
guages and are delivered with the R&S NRX.
●Throughout the documentation, safety instructions are provided when you need to
take care during setup or operation.

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3 Instrument Tour
●Front Panel Tour......................................................................................................14
●Rear Panel Tour...................................................................................................... 19
3.1 Front Panel Tour
Figure 3-1: Front panel of the R&S NRX
1 = Module bay for optional connectors, see Chapter 3.1.2, "Module Bay", on page 14.
2 = Sensor connectors A and B, see Chapter 3.1.1, "Sensor Connector A and B", on page 14.
3 = Touchscreen, see Chapter 3.1.3, "Touchscreen", on page 16.
4 = Keys, see Chapter 3.1.4, "Keys", on page 16.
5 = Cursor keys, see "Cursor keys" on page 18.
6 = USB host interface, see Chapter 3.1.5, "USB Host Interface", on page 18.
7 = On/standby key, see Chapter 3.1.6, "On/Standby Key", on page 18.
3.1.1 Sensor Connector A and B
See (2) in Figure 3-1.
Sensor connectors A and B are used to connect the R&S NRP power sensors and the
R&S NRQ6. For details on the supported power sensors, see the data sheet.
The complete functional range, including external trigger and reference clock for the
synchronization of connected sensors, is provided by these connectors.
Further information:
●Chapter 4.8, "Connecting Power Sensors", on page 26
3.1.2 Module Bay
See (1) in Figure 3-1.
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Two options fit in this bay. If you have both options, you can exchange them, see "To
exchange the option" on page 15.
If no option is installed, the module bay is closed by a cover.
Sensor check source (R&S NRX-B1)
Used as a power reference for testing the connected power sensors and the cabling.
The LED of the sensor check source (R&S NRX-B1) shows the state, see Table 3-1.
You can remove the option and send it to Rohde & Schwarz for calibration. Contact the
Rohde & Schwarz customer service.
Table 3-1: Possible states
Illumination State Signal Output setting
Off No signal is generated. "Off"
Steady green Continuous wave is output. "CW"
Blinking green Pulse signal is output. "Pulse"
Blinking red Settings conflict exists.
For example if "Pulse" is set and the
power level is set to 20 dBm.
"CW" or "Pulse"
Sensor interface for R&S NRT (R&S NRX-B9)
Provides an optional power sensor connector to connect an R&S NRT-Zxx power sen-
sor. For supported power sensors, see the data sheet.
To exchange the option
1. Press the latch to the right, using your thumb nail or a small pen.
2. Pull the option from its casing.
3. Insert the other option.
4. Press until you hear a click when the latch locks.
Further information:
●Chapter 4.8, "Connecting Power Sensors", on page 26
●"Sensor Check Source tab" on page 134
●Chapter 14.7, "Configuring the Test Generator", on page 334
Front Panel Tour

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3.1.3 Touchscreen
See (3) in Figure 3-1.
The R&S NRX displays results in panes. Depending on the measurement mode, val-
ues are displayed digitally or graphically.
False triggers of the touch panel in the presence of static electricity
If an object (e.g. a human finger) that is charged with static electricity is brought near
the touch panel, false triggers can occur.
This behavior is caused by the principle of operation of a PCAP (projected capacitive)
touch panel.
Further information:
●"Using the touchscreen" on page 29
3.1.4 Keys
See (4) in Figure 3-1.
[Esc] / Local
If you press shortly:
●Changes to the next-higher hierarchy level.
●Escapes from the entry mode in text boxes and lists.
●Closes dialogs without losing any entries that have been made.
●Switches from remote control mode (all controls disabled) to manual operation.
If you press and hold:
●Goes to the start dialog that shows an overview of the active measurements.
See Chapter 5.1.1, "Start Dialog", on page 29.
Further information:
●"Going back to a higher hierarchy level" on page 29
●Chapter 5.3.2, "Returning to Manual Operation (LOCAL)", on page 40
Screenshot
Creates a screenshot of the current display.
See Chapter 5.1.8, "Creating and Saving Screenshots", on page 38.
Remote command:
SYSTem:HCOPy on page 206
[1Trig] / Delete
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●Controls the measurements depending on the trigger mode:
– For all trigger modes except "Single", starts and stops the measurement.
– For the "Single" trigger mode, enables and triggers the measurement.
Changes of the trigger state apply to all measurements.
See also "Trigger Mode" on page 57.
●Resets the auxiliary values that provide additional information about the measured
values.
See also "Auxiliary Values" on page 48.
●Deletes numbers or text in a field so that you can enter a new value.
Enter
●Confirms entries in text fields, dialogs and selections in lists.
●Shows a frame around the control in focus. You can change the focus using the
Cursor keys.
[Freq]
Sets the carrier frequency of the applied signal. This value is used for frequency-
response correction of the measurement result.
Remote command:
[SENSe<Sensor>:]FREQuency[:CW] on page 302
Favorites
Reserved for future use.
[Preset]
Opens the "Save / Recall / Preset" dialog.
See Chapter 10, "Saving and Recalling Settings", on page 123.
If you press [Preset] again, the preset function starts.
See "Preset" on page 124.
If you press the [Preset] key during booting, the R&S NRX starts with the factory
default state.
[Zero]
Pressing [Zero] opens the "Zeroing Sensors" dialog.
If you press [Zero] again, "Zero All Sensors" starts.
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●Starts the zero calibration.
●Displays zeroing status.
●Displays sensor status.
[System]
Opens the "System Overview" dialog.
See Chapter 12, "System Settings", on page 127.
Cursor keys
See (5) in Figure 3-1.
The cursor keys are context-sensitive. The control in focus is indicated by a focus
frame. Use the cursor keys as follows:
●Selecting an element in the navigation pane.
●Selecting the active pane.
●Selecting an element from a list.
●Moving the cursor in text boxes.
●Changing the value of an entry in a text box.
3.1.5 USB Host Interface
See (6) in Figure 3-1.
USB 2.0 (universal serial bus) interface of the type A (host USB). Used to connect USB
power sensors and external devices like a keyboard, mouse, or memory stick.
Further information:
●Chapter 4.8.4, "USB 2.0 Host Interfaces", on page 27
●Chapter 4.9, "Connecting USB and External Devices", on page 28
3.1.6 On/Standby Key
See (7) in Figure 3-1.
The on/standby key toggles the R&S NRX between standby and ready state.
The following states are possible:
●Off (key is not illuminated)
The AC power switch on the back of the R&S NRX is switched off. The R&S NRX
is disconnected from the AC power supply.
●Ready (green)
The R&S NRX is ready for operation.
●Standby (red)
The power supply has the operating voltage supplied to it. Thus, the R&S NRX is
still power-supplied.
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For operating details, see Chapter 4.7, "Switching On or Off", on page 25.
3.2 Rear Panel Tour
Figure 3-2: Rear panel of the R&S NRX
1 = Trig In / Out 2 and Out 1 / Trig Out connectors, see Chapter 3.2.1, "Trig In / Out 2 and Out 1 / Trig Out
Connectors", on page 19.
2 = Ethernet interface, see Chapter 3.2.2, "Ethernet Interface", on page 20.
3 = USB device interface, see Chapter 3.2.3, "USB Device Interface", on page 20.
4 = USB host interface, see Chapter 3.2.4, "USB Host Interface", on page 20.
5 = AC supply and power switch, see Chapter 3.2.5, "AC Supply and Power Switch", on page 20.
6 = IEC 625/IEEE 488 interface, optional, see Chapter 3.2.6, "IEC 625/IEEE 488 Interface", on page 20.
7 = Sensor connectors C and D (optional), used to connect R&S power sensors, see Chapter 3.2.7, "Sensor
Connectors C and D", on page 21.
3.2.1 Trig In / Out 2 and Out 1 / Trig Out Connectors
See (1) in Figure 3-2.
The Out 1 / Trig Out BNC connectors supply an analog signal with a voltage between
0 V and 2.5 V. It can be used to output a voltage that is proportional to the measured
value (e.g. for level regulation) or a digital signal for limit monitoring.
The Trig In / Out 2 BNC connectors can be used either as an external trigger input with
a switchable impedance (10 kΩ or 50 Ω) or as a second analog output.
By default, both connectors are disabled.
Further information:
●"I/O 1, I/O 2 tabs" on page 136
Rear Panel Tour

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3.2.2 Ethernet Interface
See (2) in Figure 3-2.
The Ethernet connector is an RJ45 socket for remote controlling the R&S NRX via a
network.
3.2.3 USB Device Interface
See (3) in Figure 3-2.
USB 2.0 (universal serial bus) interface of the type B (receptacle). Used to connect the
R&S NRX to a computer for USB remote control.
3.2.4 USB Host Interface
See (4) in Figure 3-2.
See Chapter 3.1.5, "USB Host Interface", on page 18.
3.2.5 AC Supply and Power Switch
See (5) in Figure 3-2.
When the R&S NRX is connected to the AC supply, it automatically sets itself to the
correct range for the applied voltage. The range is printed on the type label. There is
no need to set the voltage manually.
For more details, see Chapter 4.6, "Connecting to the AC Power Supply",
on page 25.
3.2.6 IEC 625/IEEE 488 Interface
See (6) in Figure 3-2.
Requires GPIB/IEEE488 interface (R&S NRX-B8).
IEC bus (IEEE 488) interface for remote control of the R&S NRX. Used to connect a
controller to remote control the R&S NRX. Use a shielded cable for the connection.
Characteristics of the IEC bus (IEEE 488) interface:
●8-bit parallel data transfer
●Bidirectional data transfer
●Three-wire handshake
●High data transfer rate
●Maximum length of connecting cables 15 m (single connection 2 m)
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