Rohde & Schwarz NRT-Z14 User Manual
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Rohde & Schwarz NRT-Z14 User Manual

Directional power sensor
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R&S
NRT-Z14/44
Directional Power Sensor
User Manual
(;ÝV?2)
1179381502
Version 01

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  • Page 1 ® R&S NRT-Z14/44 Directional Power Sensor User Manual (;ÝV?2) 1179381502 Version 01...
  • Page 2 Rohde & Schwarz GmbH & Co. KG. Trade names are trademarks of the owners. ® 1179.3815.02 | Version 01 | R&S NRT-Z14/44 Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol, e.g. R&S ® NRT-Z14 is indicated as R&S NRT-Z14.

  • Page 3: Table Of Contents

    ® Contents R&S NRT-Z14/44 Contents 1 Safety and regulatory information............7 Safety instructions......................7 Labels on the product....................8 Warning messages in the documentation..............9 2 Welcome....................11 Documentation overview....................11 2.1.1 Getting started manual....................11 2.1.2 User manual........................11 2.1.3 Tutorials.........................11 2.1.4 Instrument security procedures..................11 2.1.5...
  • Page 4 ® Contents R&S NRT-Z14/44 4.3.1 Remote control using R&S Virtual NRT................ 26 4.3.2 Remote control using terminal program................ 26 5 Measurement basics................31 6 Firmware update.................. 33 Hardware and software requirements...............33 Updating the firmware....................33 R&S NRP Toolkit......................34 6.3.1 System requirements....................35 6.3.2...
  • Page 5 ® Contents R&S NRT-Z14/44 Selftest......................... 67 8 Remote control basics.................69 Device-dependent messages..................69 8.1.1 Structure and syntax of device-dependent messages..........69 8.1.2 Setting commands and queries..................69 8.1.3 Device responses......................71 Hardware functions.....................75 Command processing....................76 8.3.1 Device hardware and data record................. 77 8.3.2...
  • Page 6 ® Contents R&S NRT-Z14/44 12.2 Regular checks......................98 12.3 Cleaning........................99 12.4 Storage.........................99 12.5 Disposal........................100 List of commands................101 Index....................103 User Manual 1179.3815.02 ─ 01...

  • Page 7: Safety And Regulatory Information

    ® Safety and regulatory information R&S NRT-Z14/44 Safety instructions 1 Safety and regulatory information The product documentation helps you use the product safely and efficiently. Follow the instructions provided here and in the following chapters. Intended use The R&S NRT‑Zxx directional power sensor is intended for power and reflection mea- surements in development and for monitoring and maintenance purposes.

  • Page 8: Labels On The Product

    ® Safety and regulatory information R&S NRT-Z14/44 Labels on the product aged or broken, stop using the product. Contact Rohde & Schwarz customer service at http://www.customersupport.rohde-schwarz.com. Choosing the operating site Only use the product indoors. The product casing is not waterproof. Water that enters can electrically connect the casing with live parts, which can lead to electric shock, serious personal injury or death if you touch the casing.

  • Page 9: Warning Messages In The Documentation

    ® Safety and regulatory information R&S NRT-Z14/44 Warning messages in the documentation ● Identification of the product The front label of the power sensor contains the serial number that uniquely identi- fies the power sensor. ● Power handling capacity "Signal input and output levels"...
  • Page 10 ® Safety and regulatory information R&S NRT-Z14/44 Warning messages in the documentation User Manual 1179.3815.02 ─ 01...

  • Page 11: Welcome

    ® Welcome R&S NRT-Z14/44 Documentation overview 2 Welcome This chapter provides an overview of the user documentation and an introduction to the R&S NRT-Zxx power sensor. 2.1 Documentation overview This section provides an overview of the R&S NRT-Zxx user documentation. Unless specified otherwise, you find the documents on the R&S NRT-Zxx product page at:...

  • Page 12: Data Sheets And Brochures

    ® Welcome R&S NRT-Z14/44 Key features 2.1.6 Data sheets and brochures The data sheet contains the technical specifications of the R&S NRT-Zxx. 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.
  • Page 13 ® Welcome R&S NRT-Z14/44 Key features Voltage standing wave ratio (VSWR), reflection coefficient, return loss These parameters provide information on the matching of the load. The power sensor derives these parameters from the average power measurement in forward and reverse direction.
  • Page 14 ® Welcome R&S NRT-Z14/44 Key features User Manual 1179.3815.02 ─ 01...

  • Page 15: Getting Started

    ® Getting started R&S NRT-Z14/44 Preparing for use 3 Getting started 3.1 Preparing for use Here, you can find basic information about setting up the product for the first time. 3.1.1 Unpacking and checking 1. Unpack the product carefully. 2. Retain the original packing material. Use it when transporting or shipping the prod- uct later.

  • Page 16: Connecting To Source And Load

    ® Getting started R&S NRT-Z14/44 Preparing for use To suppress electromagnetic radiation during operation: ● Use high-quality shielded cables, for example, double-shielded RF and interface cables. ● Always terminate open cable ends. ● Ensure that connected external devices comply with EMC regulations.

  • Page 17: Connecting To A Computer Or Base Unit

    ® Getting started R&S NRT-Z14/44 Preparing for use To connect to the DUT 1. Connect RF connector (2, port 1) to the source. a) Insert RF connector (2) straight into the RF connector of the source. Take care not to tilt the R&S NRT‑Zxx directional power sensor.
  • Page 18 ® Getting started R&S NRT-Z14/44 Preparing for use 1 = R&S NRT‑Zxx directional power sensor 2 = host interface connector → sensor interface 3 = R&S NRT‑Z5 USB interface adapter 4 = USB connector → USB port 5 = computer To connect to a computer 1.

  • Page 19: Power Sensor Tour

    ® Getting started R&S NRT-Z14/44 Power sensor tour Chapter 12.1, "Checking and setting the baud rate", on page 97. Further information: ● Chapter 4.1, "Base unit", on page 23 ● User manual of the base unit 3.1.5.3 Legacy setups To support legacy setups, you can also connect the power sensor to the following leg- acy adapters and instruments: ●...

  • Page 20: Rf Connectors

    ® Getting started R&S NRT-Z14/44 Power sensor tour 3.2.1 RF connectors Always switch off the RF power before touching the RF connectors. See "Connecting directional power sensors" on page 8. The RF connectors are used for connecting the power sensor between source and load.
  • Page 21 ® Getting started R&S NRT-Z14/44 Power sensor tour Prerequisites ● The USB port of the computer must be capable to supply at least 500 mA. If neces- sary, use a self-powered USB hub. ● The drivers for the R&S NRT‑Z5 USB interface adapter are installed on the com- puter.
  • Page 22 ® Getting started R&S NRT-Z14/44 Power sensor tour User Manual 1179.3815.02 ─ 01...

  • Page 23: Operating Concepts

    ® Operating concepts R&S NRT-Z14/44 R&S Virtual NRT 4 Operating concepts ● Base unit......................... 23 ● R&S Virtual NRT..................... 23 ● Remote control......................25 4.1 Base unit See also Chapter 3.1.5.2, "Base unit", on page 18. Setup Figure 4-1: Setup for base unit 1 = signal source 2 = R&S NRT‑Zxx directional power sensor...
  • Page 24 ® Operating concepts R&S NRT-Z14/44 R&S Virtual NRT ● Remote control, see Chapter 4.3.1, "Remote control using R&S Virtual NRT", on page 26. Installing the program R&S Virtual NRT is provided on the Rohde & Schwarz website as a separate stand- alone installation package, https://www.rohde-schwarz.com/software/nrt-z_nap-z/.

  • Page 25: Remote Control

    ® Operating concepts R&S NRT-Z14/44 Remote control 3. Start R&S Virtual NRT. A few seconds after the user interface is displayed, when the pointers of the analog indication start wriggling, the power sensor is ready for operation. For further instructions, see the R&S Virtual NRT help.

  • Page 26: Remote Control Using R&S Virtual Nrt

    ® Operating concepts R&S NRT-Z14/44 Remote control manual operation. You can monitor the power sensor and support the development of your own test program. Further information: ● Chapter 7, "Remote control commands", on page 37 ● Chapter 3.1.5.1, "Computer", on page 17 4.3.1 Remote control using R&S Virtual NRT...
  • Page 27 ® Operating concepts R&S NRT-Z14/44 Remote control Power sensor interface settings ● Parity: none ● Data bits: 8 ● Stop bits: 1 ● Start bits: 1 ● Protocol: XON / XOFF You can change the baud rate, see Chapter 12.1, "Checking and setting the baud rate",...
  • Page 28 ® Operating concepts R&S NRT-Z14/44 Remote control 3. Recommendation for "Terminal" settings: Set both "Local echo" and "Local line editing" to "Force on". This way, you can see your input and edit the input line. 4. Under "Connection" > "Serial", configure the parameters of the serial interface.
  • Page 29 ® Operating concepts R&S NRT-Z14/44 Remote control 4.3.2.2 Testing the connection On power-up, the R&S NRT-Zxx responds to commands with one or several lines, if the connection is working. To ready the power sensor for measuring 1. Open the terminal program.
  • Page 30 30. To query the identification ► Send the id command. The power sensor responds with its identification string. Example: @6E Rohde&Schwarz NRT-Z14 V3.00 2021-12-01____ To query the last result ► Send rtrg. The power sensor responds with: @11 +2.1234E+01 +2.1530E+01 __avrl15500 ________ Interpreting the response: ●...

  • Page 31: Measurement Basics

    ® Measurement basics R&S NRT-Z14/44 5 Measurement basics The R&S NRT‑Zxx directional power sensor measures the forward and reverse power. The forward power is the power flux from the source to the load. The ratio of forward and reverse power is a measure of the matching of the load which can be measured as standing wave ratio (SWR), return loss or reflection coefficient.
  • Page 32 ® Measurement basics R&S NRT-Z14/44 User Manual 1179.3815.02 ─ 01...

  • Page 33: Firmware Update

    ® Firmware update R&S NRT-Z14/44 Updating the firmware 6 Firmware update ● Hardware and software requirements..............33 ● Updating the firmware..................... 33 ● R&S NRP Toolkit..................... 34 6.1 Hardware and software requirements For performing a firmware update, the system requirements are as follows: ●...

  • Page 34: R&S Nrp Toolkit

    ® Firmware update R&S NRT-Z14/44 R&S NRP Toolkit 4. Under "Firmware", enter the full path and filename of the update file or press the browse button next to the field. New firmware for the R&S NRT-Zxx has an *.bin extension.

  • Page 35: System Requirements

    ® Firmware update R&S NRT-Z14/44 R&S NRP Toolkit 6.3.1 System requirements Hardware requirements: ● Desktop computer or laptop Supported Microsoft Windows versions: ● Microsoft Windows Vista 32/64-bit ● Microsoft Windows 7 32/64-bit ● Microsoft Windows 8/ 8.1 32/64-bit ● Microsoft Windows 10 32/64-bit 6.3.2 Installation...
  • Page 36 ® Firmware update R&S NRT-Z14/44 R&S NRP Toolkit User Manual 1179.3815.02 ─ 01...

  • Page 37: Remote Control Commands

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands 7 Remote control commands Describes all commands useful for measurement tasks. An alphabetic list of all com- mands is provided at the end of the user manual. 7.1 Measurement setting commands Enter physical quantities in their basic unit —...

  • Page 38: Ccdf

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Remote commands ........................38 BURS:PER ........................38 BURS:WIDT BURS:PER <num> Sets the burst period for the forward calculated burst average measurement, CBAV. Parameters: <num> Burst period, see Figure 7-1. Range: <burst width> to 1.0...

  • Page 39: Disp

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands See also Chapter 3.1.4, "Connecting to source and load", on page 16. Parameters: <parameter> AUTO The power sensor automatically assigns the direction. The greater of the two measured powers are interpreted as forward power.
  • Page 40 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Example: RESET # Activates default settings. @30 OK__________________________________________ DMA OFF # Disables filling-up to 50 characters. @39 old: ON new: OFF____________________________ RTRG # Requests result. @F9 +2.1234E+01 +2.1530E+01 __avrl15500 DISP:FORW OFF # Disables the forward power display.

  • Page 41: Freq

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands 7.1.5 FREQ FREQ <num> Sets the carrier frequency of the test signal. With this information, the characteristic frequency response of the power sensor can be considered and the results corrected accordingly. Correction is made for the forward and the reverse channel.
  • Page 42 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Integration time You can select the integration time of the A/D converters in the two measurement channels. This setting affects the stability of results at low powers (noise) and with low- frequency modulation of the envelope.
  • Page 43 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands 1 = 4 MHz video bandwidth 2 = 200 kHz video bandwidth 3 = 4 kHz video bandwidth Table 7-1 shows the bandwidth settings for several common waveforms. The settings allow transmission of the rectified signal that is largely free from distortion.
  • Page 44 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Parameters: <num> A value of 1 means that no averaging takes place. Each mea- sured value is output immediately. Range: 1, 2, 4, 8, 16, 32, 64, 128, 256 RESET: 1 FILT:AVER:MODE <parameter>...

  • Page 45: For

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands FILT:RES <parameter> Sets the number of significant digits for automatic averaging. Also enables automatic averaging; you do not need to send AUTO in this case. FILT:AVER:MODE See also: ● FILT:AVER:MODE ●...
  • Page 46 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Peak envelope power (PEP) Burst average Average Time Burst width Burst period Figure 7-4: Forward power measurement parameters FOR <parameter> AVER Sets the forward average power measurement. This measurement provides the lowest measurement uncertainty and the widest mea- surement range.
  • Page 47 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Make sure that the video bandwidth is correct using FILT:VID. You can increase the accuracy for digitally modulated signals by enabling the modula- tion correction, see Chapter 7.1.8, "MOD", on page 49.
  • Page 48 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands For further information on the correct setting of the power sensor, see also PEP. MBAV Sets the forward measured burst average measurement (MBAV: measured burst aver- age). The measured burst average is calculated from the average power and the duty cycle, Figure 7-4.

  • Page 49: Mod

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Figure 7-6: Output signal for peak envelope power (PEP) The output signal is smoothed by digitization and subsequent averaging so that the actual fluctuation is much lower than shown in Figure 7-6.

  • Page 50: Offs

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Parameters: <num> Range: 0 to 8.2E6 RESET: 4.096E6 Unit: per second MOD:TYPE <parameter> Sets a communication standard for the modulation correction to reduce systematic deviations occurring in power measurements. The corrections always apply to the following measurements: forward average power AVER, forward calculated burst average CBAV, forward measured burst average MBAV.

  • Page 51: Pep

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Depending on whether the cable is connected to the source or load port, the specified attenuation value has different effects on the measurement result. See "Reference plane" on page 51. Parameters: <num>...
  • Page 52 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Measurement point source Measurement point load Offset source Offset load Forward Return loss Reverse Position Figure 7-7: Definition of the test point Depending on the desired measurement result, the measurement has to be carried out at the source or load.

  • Page 53: Reset

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands ● R&S NRT‑Z44: 0.048 dB at 4 GHz At some DUTs, the test point itself is not accessible, for example an output connector of a transmitter or an antenna input. In these cases, you can enter the attenuation of the cable that connects the power sensor and the test point using OFFS.
  • Page 54 ® Remote control commands R&S NRT-Z14/44 Measurement setting commands The reverse measurement set by default is RL. REV <parameter> The effect of this command depends on the selected forward measurement. Except for the crest factor, peak envelope power and complementary cumulative distribution func-...

  • Page 55: Zero

    ® Remote control commands R&S NRT-Z14/44 Measurement setting commands Sets the standing wave ratio (SWR) measurement. The standing wave ratio indicates the ratio of maximum to minimum voltage on an RF line: 1 + Reflection coefficient Standing wave ratio = 1 −...

  • Page 56: Query Commands

    ® Remote control commands R&S NRT-Z14/44 Query commands Disables the zero offset correction; active on power-up. 7.2 Query commands ● FTRG........................56 ● QSTN........................56 ● RTRG........................57 ● SPEC........................57 ● STAT........................60 7.2.1 FTRG FTRG Starts a continuous measurement at a high speed controlled by an internal timer, with- out any reference to an external trigger.

  • Page 57: Rtrg

    ® Remote control commands R&S NRT-Z14/44 Query commands 7.2.3 RTRG RTRG Triggers a remote-controlled measurement. The command interrupts the current, internally controlled measurement, starts a new measurement and outputs the result. If averaging is enabled, a result is output only when averaging is completed, i.e. when the required number of measurements has been performed.
  • Page 58 ® Remote control commands R&S NRT-Z14/44 Query commands Line Parameter Meaning FORW:AVER:RANG:LSD Least significant digit of measured value with decimal nota- tion in W Example: -3 means that results are represented including the mW position. 17 - 20 FORW:MBAV:RANG:LOWn Lower measurement limit for forward measured burst aver- n: coding of video bandwidth, see lines 60 to 64.
  • Page 59 ® Remote control commands R&S NRT-Z14/44 Query commands Example: SPEC # Response: Multiple lines with the following structure: @28 pack 72 @A4 01 ID:ID:Rohde & Schwarz NRT-Z43V1.40 @53 02 ID:SER @61 03 ID:CAL:REV @44 04 ID:CAL:LAB @4F 05 ID:CAL:DAT @A8 06 ID:CAL:SIGN @4A 07 ID:STOCK 1081.2905.02...

  • Page 60: Stat

    ® Remote control commands R&S NRT-Z14/44 Query commands @44 48 FORW:CCDF:RANG:LSD2 -2 @46 49 FORW:CCDF:RANG:LSD3 -2 @3F 50 FORW:CCDF:RANG:LSD4 -2 @EA 51 REFL:AVER:RANG:LOW 0.0007 @35 52 REFL:AVER:RANG:UPP 75 @1A 53 REFL:AVER:RANG:LSD -5 @93 54 FILT:AVER:AUTO @7C 55 FILT:AVER:COUN:UPP 256 @EB 56 FILT:AVER:COUN:DEF 1 @FF 57 FILT:INT:TIME:LOW 1.06E-3...
  • Page 61 ® Remote control commands R&S NRT-Z14/44 Query commands Example: STAT:MEAS # Response: Multiple lines with the following structure: @26 pack 34 @04 01 Cal.mode lock: @CE 02 DMA mode: @EE 03 Forward meas. func.: AVER @AC 04 Reverse meas. func.: @84 05 Burst period: 1.0000E-01...
  • Page 62 ® Remote control commands R&S NRT-Z14/44 Query commands Example: STAT:ERR:TEXT # Response: Multiple lines with the following structure. # Example (DMA OFF): @27 pack 26 @6E 01 HW PARAMETERS: @07 02 SUPPLY VOLTAGE + (ANA) @0C 03 SUPPLY VOLTAGE + (DIG)

  • Page 63: General Commands

    ® Remote control commands R&S NRT-Z14/44 General commands STAT:ERR:VALS Gives details on the status of the analog hardware, listed in under STAT:ERR:TEXT HW PARAMETERS. Returns the internal test voltages together with their limit values. Example: STAT:ERR:VALS @DD pack 12_____________________________________ @3D 01 SUPPLY VOLTAGE + (ANA): +4.7500E+00 +5.0191E+00 +5.2500E+00 @47 02 SUPPLY VOLTAGE + (DIG): +4.7500E+00 +5.0394E+00 +5.2500E+00...
  • Page 64 ® Remote control commands R&S NRT-Z14/44 General commands The power sensor is in its normal operating mode, the measurement mode. Enable the power sensor by sending at least once. See Chapter 4.3.2.2, "Testing the APPL connection", on page 29. BOOT Enables the boot mode.
  • Page 65 ® Remote control commands R&S NRT-Z14/44 General commands Example: HELP # Lists all commands of the highest command level: @DE pack 31_____________________________________ @E9 01 appl - operation mode ('boot' or 'oper') @93 02 basever - base unit version control comm.
  • Page 66 ® Remote control commands R&S NRT-Z14/44 General commands Example: CALIB:HELP # Lists all calibration commands. @DF pack 05_____________________________________ @11 01 filt - filter settings (filt:help)______ @80 02 for - forward meas. function (for:help) @E0 03 freq - correction freq. in Hz___________...

  • Page 67: Selftest

    ® Remote control commands R&S NRT-Z14/44 Selftest PURGE Deletes the contents of the input buffer, thus preventing the execution of waiting com- mands. Useful to prepare the power sensor quickly for a new measurement task. No response is given. SETUP:SAVE <num>...
  • Page 68 ® Remote control commands R&S NRT-Z14/44 Selftest User Manual 1179.3815.02 ─ 01...

  • Page 69: Remote Control Basics

    ® Remote control basics R&S NRT-Z14/44 Device-dependent messages 8 Remote control basics ● Device-dependent messages..................69 ● Hardware functions....................75 ● Command processing..................... 76 ● Status reporting system..................77 8.1 Device-dependent messages Messages from the power sensor are called device-dependent messages. These mes- sages are transmitted on the TXD and RXD pair of lines of the serial RS-422 interface.
  • Page 70 ® Remote control basics R&S NRT-Z14/44 Device-dependent messages If an input parameter is added to a command, separate it from the command by at least one blank. Terminate a command with an end-of-line character. You can send several commands in a command line, but they must be separated by commas.

  • Page 71: Device Responses

    ® Remote control basics R&S NRT-Z14/44 Device-dependent messages Input limits Exist for all number parameters. If you try to enter a parameter outside the defined range of values, it is rejected with an error message: Error RANGE. Correct entries are acknowledged with: old: <old parameter>...
  • Page 72 ® Remote control basics R&S NRT-Z14/44 Device-dependent messages e for error Hardware errors are also detected in the selftest, see Chapter 9.3, "Selftest", on page 83. Second character Indicates whether the defined measurement limits are complied with. ● Values below the specified power range or outside the allowed temperature range: i for invalid ●...
  • Page 73 ® Remote control basics R&S NRT-Z14/44 Device-dependent messages Seventh character Indicates the forward power direction, see Chapter 7.1.3, "DIR", on page 38. ● Privileged direction, source at port 1 ● Inverse direction, source at port 2 Last four characters Indicate the settings of the averaging filters for the physical measurement channel, see Chapter 7.1.6,...
  • Page 74 ® Remote control basics R&S NRT-Z14/44 Device-dependent messages 8.1.3.3 Multiple-line responses Some device responses take up several lines, e.g. the response to SPEC. To detect transmission errors reliably and to make interpretation easier, multiple-line responses are output together with additional information.

  • Page 75: Hardware Functions

    ® Remote control basics R&S NRT-Z14/44 Hardware functions The power sensor is waiting for new commands. If a new command is sent, the power sensor executes it immediately. 8.2 Hardware functions F-AVG amplifier Lowpass filter Peak hold F-ADC Forward Video filter...

  • Page 76: Command Processing

    ® Remote control basics R&S NRT-Z14/44 Command processing Digitization is performed by two highly linear ΣΔ A/D converters, F-ADC and R-ADC, with two measurement channels each. The preset measurement time of the two con- verters is 36.667 ms. You can change this time using FILT:INT:TIME. Further...

  • Page 77: Device Hardware And Data Record

    ® Remote control basics R&S NRT-Z14/44 Status reporting system If the input buffer is full, bus traffic is stopped using the XON/XOFF protocol, and the data received up to this time are processed. Then, data traffic is resumed. If the buffer is not full, the input unit can receive the next command while the previous command is detected and executed.

  • Page 78: Device Status

    ® Remote control basics R&S NRT-Z14/44 Status reporting system 8.4.1 Device status The device status covers all parameters relating to measurements. It is output as a multiple-line response by STAT:MEAS. You can reset all these parameters to a defined initial status by RESET.
  • Page 79 ® Remote control basics R&S NRT-Z14/44 Status reporting system Position Error description Cause (from right) REFL. CONTROL VOLTAGE ERROR Offset control voltage for reflection amplifier (test point K603:14) out of tolerance CCDF OUTPUT LOW ERROR Min. settable CCDF threshold voltage out of tolerance...
  • Page 80 ® Remote control basics R&S NRT-Z14/44 Status reporting system 8.4.2.2 Permanent errors Information for service personnel authorized by Rohde & Schwarz. Error flags no. 10 and 11 Occurrence: At any time. The errors are immediately written into the error status report.
  • Page 81 ® Remote control basics R&S NRT-Z14/44 Status reporting system Further information ● Chapter 9, "Troubleshooting", on page 83 User Manual 1179.3815.02 ─ 01...
  • Page 82 ® Remote control basics R&S NRT-Z14/44 Status reporting system User Manual 1179.3815.02 ─ 01...

  • Page 83: Troubleshooting

    ® Troubleshooting R&S NRT-Z14/44 Selftest 9 Troubleshooting Before starting measurement operation, wait until the instruments have warmed up. 9.1 Test setup Chapter 3.1.5, "Connecting to a computer or base unit", on page 17. 9.2 Power-up selftest The R&S NRT‑Zxx directional power sensors perform an automatic test of several hardware parameters after power-up.
  • Page 84 ® Troubleshooting R&S NRT-Z14/44 Selftest If all error state parameters are marked as "OK", the selftest is passed success- fully. Using a base unit You can perform a selftest of a connected power sensor using manual operation or remote control. See the user manual of the base unit for details.

  • Page 85: Contacting Customer Support

    ® Troubleshooting R&S NRT-Z14/44 Contacting customer support @62 16 COMMUNICATION ADC 2 OK_______________ @FC 17 PEP CIRCUIT OPERATION OK_______________ @1E 18 FLASH READ OK_______________ @6E 19 FLASH WRITE OK_______________ @8E 20 CAL. VALUES CHECKSUM OK_______________ @86 21 CALIBRATION VALUES OK_______________...
  • Page 86 ® Troubleshooting R&S NRT-Z14/44 Contacting customer support User Manual 1179.3815.02 ─ 01...

  • Page 87: Testing The Rated Specifications

    ® Testing the rated specifications R&S NRT-Z14/44 Test equipment 10 Testing the rated specifications Checking the specifications for the measurement uncertainties given in the data sheet requires an extensive test equipment. The more simple test setups described here are suitable replacements for troubleshooting but have higher measurement uncertainties.

  • Page 88: Test Setup

    ® Testing the rated specifications R&S NRT-Z14/44 Test sequences 10.2 Test setup Figure 10-1: Test setup 1 = signal generator, see (2) in Table 10-1 2 = power amplifier, see (3) in Table 10-1 3 = harmonic filter 4 = DUT...

  • Page 89: Testing The Ccdf Threshold

    ® Testing the rated specifications R&S NRT-Z14/44 Test sequences To perform the test Perform the test sequence for both directions of the power sensor. 1. Signal generator: a) Switch off the output power. b) Set the test frequency according to Chapter 10.4, "Performance test...

  • Page 90: Testing The Pep Measurement

    ® Testing the rated specifications R&S NRT-Z14/44 Test sequences c) Reference power meter 4. Reference power meter: Activate frequency response correction. 5. Signal generator: a) Switch on the output power (test signal not modulated). b) Set the level so that the reference power meter measures 3.8 W to 4.2 W power.

  • Page 91: Testing The Directivity

    ® Testing the rated specifications R&S NRT-Z14/44 Test sequences 6. Signal generator: a) Switch on the output power (test signal not modulated). b) Set the level so that the reference power meter measures 0.975 W to 1.025 W power. c) Set 80 % AM modulation.

  • Page 92: Testing The Matching

    ® Testing the rated specifications R&S NRT-Z14/44 Performance test report 10.3.5 Testing the matching Figure 10-2: Test setup for testing the matching 1 = reflection test system 2 = device under test 3 = precision 50 Ω termination To perform the test Perform the test sequence for both directions of the power sensor.
  • Page 93 ® Testing the rated specifications R&S NRT-Z14/44 Performance test report ‑ Z14 test report Table 10-2: R&S NRT Act. 1 → 2 Act. 2 → 1 Characteristic Min. Max. Unit AVG measurement, see 10.3.1 −4.6 (−0.20) 27.5 MHz +4.6 (+0.20) % (dB) −4.6 (−0.20)
  • Page 94 ® Testing the rated specifications R&S NRT-Z14/44 Performance test report ‑ Z44 test report Table 10-3: R&S NRT Act. 1 → 2 Act. 2 → 1 Characteristic Min. Max. Unit AVG measurement, see 10.3.1 −4.6 (−0.20) 0.22 GHz +4.6 (+0.20) % (dB) −3.9 (−0.17)

  • Page 95: Transporting

    ® Transporting R&S NRT-Z14/44 11 Transporting Packing Use the original packaging material. It consists of antistatic wrap for electrostatic pro- tection and packing material designed for the product. If you do not have the original packaging, use similar materials that provide the same level of protection.
  • Page 96 ® Transporting R&S NRT-Z14/44 User Manual 1179.3815.02 ─ 01...

  • Page 97: Maintenance, Storage And Disposal

    ® Maintenance, storage and disposal R&S NRT-Z14/44 Checking and setting the baud rate 12 Maintenance, storage and disposal The product does not require regular maintenance. It only requires occasional clean- ing. It is however advisable to check the nominal data from time to time.

  • Page 98: Regular Checks

    ® Maintenance, storage and disposal R&S NRT-Z14/44 Regular checks Table 12-1: Baud rate settings Baud rate DIP switch position Left Right 38400 Bd 19200 Bd 9600 Bd 4800 Bd 12.2 Regular checks If the power sensor is used frequently, check the RF connectors for visible damage - bent inner conductors, broken contact springs and so on.

  • Page 99: Cleaning

    ® Maintenance, storage and disposal R&S NRT-Z14/44 Storage Checking the concentricity of the RF connector 1 = Perfectly concentric 2 = Slightly off-center 3 = Excessively off-center 12.3 Cleaning 1. Disconnect the R&S NRT-Zxx: a) From source and load. b) From the computer or base unit.

  • Page 100: Disposal

    ® Maintenance, storage and disposal R&S NRT-Z14/44 Disposal 12.5 Disposal Rohde & Schwarz is committed to making careful, ecologically sound use of natural resources and minimizing the environmental footprint of our products. Help us by dis- posing of waste in a way that causes minimum environmental impact.

  • Page 101: List Of Commands

    ® List of commands R&S NRT-Z14/44 List of commands APPL................................63 AVER................................46 BOOT................................64 BURS:PER...............................38 BURS:WIDT..............................38 CBAV................................46 CCDF................................38 CCDF................................46 CF..................................47 DIR...................................38 DISP:FORW..............................39 DISP:REFL..............................40 DISP:STAT...............................40 DMA.................................64 FILT:AVER:COUN............................43 FILT:AVER:MODE............................44 FILT:INT:MODE..............................44 FILT:INT:TIME..............................44 FILT:RES................................45 FILT:VID................................45 FREQ................................41 FTRG................................56 HELP................................64...
  • Page 102 ® List of commands R&S NRT-Z14/44 SWR.................................55 ZERO................................55 User Manual 1179.3815.02 ─ 01...

  • Page 103: Index

    ® Index R&S NRT-Z14/44 Index Application cards ............... 12 Firmware update ............... 33 Application notes ............... 12 Potential risks ............. 33 Average power measurement ........... 46 Problems ..............34 Averaging ................41 Requirements ............. 33 Forward measurement ............45 Average power ............46 Calculated burst average ..........
  • Page 104 ® Index R&S NRT-Z14/44 Operating concepts ............23 Safety information ............... 7 R&S NRT2 ..............23 Safety instructions ............7, 11 Security procedures ............11 R&S Virtual NRT ............23 Selftest ................ 67, 83 Remote control ............25 Sensor messages Operating conditions ............15 See device-dependent messages ......

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