Rohde & Schwarz 1411.4002K02 Service Manual

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Service Manual

Signal Generator

R&S SMC100A

1411.4002K02

Test and Measurement

1411.4060.82-04-

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Summary of Contents for Rohde & Schwarz 1411.4002K02

Page 1 Service Manual Signal Generator R&S SMC100A 1411.4002K02 Test and Measurement 1411.4060.82-04-...
Page 2 Dear Customer, throughout this manual, the Signal Generator R&S® SMC100A is abbreviated as R&S SMC100A. The firmware of the instrument makes use of the operating system LINUX® and other valuable open source software packages. The most important of them are listed below together with their corresponding open source license.
Page 3 R&S SMC100A Chapter Overview Chapter Overview Index Safety Instructions Customer Information Regarding Product Disposal Certificate of Quality Customer Support Procedure in Case of Service and Ordering of Spare Parts Contents of Service Manual for the Signal Generartor R&S SMC100A Chapter 1: Performance Test Chapter 2: Procedures after Module Replacement...
Page 5 R&S SMC100A Index Index Phase noise Adjustments ..............2.1 Test assembly ............1.4 Amplitude modulation Power cables ..............5.2 Test procedure..........1.26, 1.31 Power Supply Module .............3.5 Protection service functions ..........3.14 Pulse modulation Test procedure ............1.38 Boot problems Troubleshooting ............. 3.11 Rated characteristics Checking ..............1.1 Check Test procedures............1.7...
Page 7 Basic Safety Instructions Always read through and comply with the following safety instructions! All plants and locations of the Rohde & Schwarz group of companies make every effort to keep the safety standards of our products up to date and to offer our customers the highest possible degree of safety. Our products and the auxiliary equipment they require are designed, built and tested in accordance with the safety standards that apply in each case.
Page 8 Basic Safety Instructions Tags and their meaning The following signal words are used in the product documentation in order to warn the reader about risks and dangers. indicates a hazardous situation which, if not avoided, will result in death or serious injury.
Page 9 Basic Safety Instructions Electrical safety If the information on electrical safety is not observed either at all to the extent necessary, electric shock, fire and/or serious personal injury or death may occur. 1. Prior to switching on the product, always ensure that the nominal voltage setting on the product matches the nominal voltage of the AC supply network.
Page 10 Basic Safety Instructions 14. Use suitable overvoltage protection to ensure that no overvoltage (such as that caused by a bolt of lightning) can reach the product. Otherwise, the person operating the product will be exposed to the danger of an electric shock. 15.
Page 11 Basic Safety Instructions Repair and service 1. The product may be opened only by authorized, specially trained personnel. Before any work is performed on the product or before the product is opened, it must be disconnected from the AC supply network.
Page 12 Informaciones elementales de seguridad 2. Handles on the products are designed exclusively to enable personnel to transport the product. It is therefore not permissible to use handles to fasten the product to or on transport equipment such as cranes, fork lifts, wagons, etc. The user is responsible for securely fastening the products to or on the means of transport or lifting.
Page 13 Informaciones elementales de seguridad Se parte del uso correcto del producto para los fines definidos si el producto es utilizado conforme a las indicaciones de la correspondiente documentación del producto y dentro del margen de rendimiento definido (ver hoja de datos, documentación, informaciones de seguridad que siguen). El uso del producto hace necesarios conocimientos técnicos y ciertos conocimientos del idioma inglés.
Page 14 Informaciones elementales de seguridad Palabras de señal y su significado En la documentación del producto se utilizan las siguientes palabras de señal con el fin de advertir contra riesgos y peligros. PELIGRO identifica un peligro inminente con riesgo elevado que provocará...
Page 15 Informaciones elementales de seguridad Seguridad eléctrica Si no se siguen (o se siguen de modo insuficiente) las indicaciones del fabricante en cuanto a seguridad eléctrica, pueden producirse choques eléctricos, incendios y/o lesiones graves con posible consecuencia de muerte. 1. Antes de la puesta en marcha del producto se deberá comprobar siempre que la tensión preseleccionada en el producto coincida con la de la red de alimentación eléctrica.
Page 16 Informaciones elementales de seguridad 12. Si un producto se instala en un lugar fijo, se deberá primero conectar el conductor de protección fijo con el conductor de protección del producto antes de hacer cualquier otra conexión. La instalación y la conexión deberán ser efectuadas por un electricista especializado. 13.
Page 17 Informaciones elementales de seguridad 5. Ciertos productos, como p. ej. las instalaciones de radiocomunicación RF, pueden a causa de su función natural, emitir una radiación electromagnética aumentada. Deben tomarse todas las medidas necesarias para la protección de las mujeres embarazadas. También las personas con marcapasos pueden correr peligro a causa de la radiación electromagnética.
Page 18 Informaciones elementales de seguridad 6. En caso de falta de estanqueidad de una celda, el líquido vertido no debe entrar en contacto con la piel ni los ojos. Si se produce contacto, lavar con agua abundante la zona afectada y avisar a un médico.
Page 19 Sicherheitshinweise Kundeninformation zur Batterieverordnung (BattV) Dieses Gerät enthält eine schadstoffhaltige Batterie. Diese darf nicht mit dem Hausmüll entsorgt werden. Nach Ende der Lebensdauer darf die Entsorgung nur über eine Rohde&Schwarz-Kundendienststelle oder eine geeig- nete Sammelstelle erfolgen. Safety Regulations for Batteries (according to BattV) This equipment houses a battery containing harmful sub- stances that must not be disposed of as normal household...
Page 21 Instructions - Instrucciones Instructions for Electrostatic Discharge Protection Risk of damaging electronic components To avoid damage of electronic components, the operational site must be protected against electrostatic discharge (ESD). Wrist strap with cord Floor mat Heel strap Ground connection of operational site The following two methods of ESD protection may be used together or separately: , Wrist strap with cord to ground connection...
Page 22 Instructions - Instrucciones Instrucciones para la protección contra descargas electroestáticas Riesgo de avería de los componentes electrónicos Para evitar averías en los componentes electrónicos, el área de trabajo tiene que estar protegido contra descargas electroestáticas ESD (elec- trostatic discharge). Muñequera con cordón Estera Talonera Conexión a tierra del...
Page 23 Safety Instructions - Informaciones de seguridad Safety Instructions for Units with Removable Cabinet Danger of injuries When removing the rear feet, the unit can slip out of the cabinet. Put the unit onto the front handles, before removing the rear feet and taking off the cabinet.
Page 24 Safety Instructions - Informaciones de seguridad Informaciones de seguridad para aparatos con tubo de quita y pon Peligro de heridas Al sacar los piés de la pared posterior puede deslizarse el aparato fue- ra de la caja. Posicionar el aparato de manera segura sobre las asas delanteras, antes de sacar los piés de la pared posterior y entonces sacar la caja.
Page 25 Procedure in Case of Service and Ordering of Spare Parts This section contains information on shipping an instrument to your service center and ordering spare parts. Please contact your local Rohde & Schwarz service center if you need service or repair work of your equipment or to order spare parts.
Page 26 Ordering Spare Parts To deliver spare parts promptly and correctly, we need the following information: ● Stock number (see list of spare parts in chapter "Documents") ● Designation ● Component number according to list of spare parts ● Number of pieces ●...
Page 27 R&S SMC100A Contents "Performance Test" Contents - Chapter 1 "Performance Test" 1 Checking the Rated Characteristics ..................1.1 Measuring Equipment and Accessories ..................1.1 Test Assemblies ..........................1.3 Standard Test Assembly for Analog Modulations ..............1.3 Test Assembly for Pulse Modulation ..................1.3 Test Assembly for Residual AM ....................1.4 Test Assembly for SSB Phase Noise and Jitter ...............1.4 Test Assembly for Output Impedance (VSWR) ...............1.5 Test Assembly for Setting Time ....................1.5...
Page 28 Contents "Performance Test" R&S SMC100A Pulse Modulation........................1.40 ON/OFF Ratio ......................1.40 Rise/ Fall Time ......................1.41 Video Crosstalk ......................1.42 Pulse Generator ........................1.43 PULSE VIDEO ......................1.43 1411.4060.82 I-1.2...
Page 29 R&S SMC100A Measuring Equipment and Accessories 1 Checking the Rated Characteristics This performance test describes the steps for testing the R&S SMC Signal Generator family and the installed options with respect to function and compliance with specifications. In the following, the term DUT (Device under Test) is used for any signal generator of this family. The tests to be performed depend on the installed options.
Page 30 Measuring Equipment and Accessories R&S SMC100A Item Type of Instrument Required Characteristics Suitable Instrument R&S Order No. VSWR bridge 100 MHz to RF R&S ZRC or 1039.9492.55 directivity > 30 dB Agilent 773D RF power amplifier 10 MHz to RF Mini Circuits ZHL-03-5WF power >...
Page 31 R&S SMC100A Test Assemblies Test Assemblies Standard Test Assembly for Analog Modulations Test equipment RF analyzer (Table 1-1, item 18) Signal generator (Table 1-1, item 5) Test setup The RF analyzer is used as a modulation analyzer. The signal generator is used as modulation source in case of external modulation.
Page 32 Test Assemblies R&S SMC100A Test Assembly for Residual AM Test equipment RF analyzer (Table 1-1, item 18) Zero Bias Schottky Detector (Table 1-1, item 20) Low Noise Preamplifier 10 Hz – 30kHz, >30dB Gain (Table 1-1, item 9) 10 MHz Ref. Test setup Analyzer Detector...
Page 33 R&S SMC100A Test Assemblies Test Assembly for Output Impedance (VSWR) Test equipment VSWR bridge (Table 1-1, item 10), Second signal generator (Table 1-1, item 5) Spectrum analyzer (Table 1-1, item 18) Test setup 2nd RF 6 dB OUTPUT COUPLED INPUT 10 MHz Ref.
Page 34 Preparation, Recommended Test Frequencies and Levels R&S SMC100A Preparation, Recommended Test Frequencies and Levels To ensure proper conditions for the performance test and prevent setting errors, the instrument must be prepared as follows: • Allow for a minimum warm-up time of 30 minutes at ambient temperature. •...
Page 35 R&S SMC100A Test Procedures Test Procedures Reference Frequency Output of Internal Reference Important: Allow the DUT to warm up for at least 2 hours before the measurement. Test equipment RF power meter (Table 1-1, item 8), Frequency counter (Table 1-1, item 1) Test setup Connect an RF power meter to the REF OUT output (on rear panel).
Page 36 Test Procedures R&S SMC100A Input for External Reference Test equipment Frequency counter (Table 1-1, item 1) Signal generator (Table 1-1, item 5) Test method The external reference input frequency of the DUT is varied according to the data sheet and the RF output signal frequency is controlled with a frequency counter to follow this variation.
Page 37 R&S SMC100A Test Procedures Frequency Frequency Setting Test method The frequency setting is checked by running the internal synthesizer adjustments to check the frequency overlap of the VCOs Measurement Run: Setup Internal Adjustments Adjust Synthesis There must be no error message. Setting Time (only for Option R&S SMC-K4) Test assembly See section...
Page 38 Test Procedures R&S SMC100A Settings on analyzer: - Set the analyzer to the stop frequency Measurement Set the DUT to the start frequency f start Send the stop frequency f from the controller to the DUT. stop The externally triggered analyzer displays the settling curve. The setting time is defined as the time from which on the frequency deviation from the stop frequency is less than the specified deviation in the data sheet.
Page 39 R&S SMC100A Test Procedures Spectral Purity Harmonics Test equipment Spectrum analyzer (Table 1-1, item 18) Test setup Connect the spectrum analyzer to the RF output of the DUT. Synchronize the reference frequencies of analyzer and DUT. Measurement Settings on analyzer: Reference level = 20 dBm, 10 dB/div.
Page 40 Test Procedures R&S SMC100A Nonharmonics Test equipment Same as for harmonics Test setup Same as for harmonics Measurement Setting on analyzer: Reference level = 0 dBm, 10 dB/div. Span 50 Hz, Resolution bandwidth 10 Hz Setting on DUT Level = 0 dBm First the carrier level P is measured at the test frequency f as reference and then the signal level P...
Page 41 R&S SMC100A Test Procedures Non-systematic nonharmonics Measurement Settings on DUT: Test frequency 1 GHz Test level 0 dBm unmodulated Recommended settings on analyzer: - Max peak detector - Filter Type: FFT - Ref-Level 0 dBm - Set analyzer center frequency to 1 GHz, span to 40 MHz and resolution bandwidth to 2 kHz - Measure carrier level P - all signals other than the carrier must be below P –...
Page 42 Test Procedures R&S SMC100A Wideband Noise Test assembly Connect spectrum analyzer to RF socket of the DUT. Test method The carrier power is measured first. Then the center frequency of the analyzer is increased by 10 MHz and the noise power in a small bandwidth is measured.
Page 43 R&S SMC100A Test Procedures Evaluation If the power < P - 0.41 dB noise the inherent noise power of the analyzer can be subtracted: Pnoise Noise If the power > P - 0.41 dB noise the analyzer resolution is not sufficient for a precise measurement. The true result is in such case certainly more than 10 dB below the measured value.
Page 44 Test Procedures R&S SMC100A SSB Phase Noise The SSB phase noise of the DUT can be measured direct if a Phase Noise Test Set is available. An R&S FSUP or any other analyzer with phase noise option is suitable if its own phase noise is at least 6 dB less than the guaranteed DUT Phase noise in the data sheet.
Page 45 R&S SMC100A Test Procedures Residual FM Test assembly Connect spectrum analyzer to RF socket of the DUT. Test method The FM demodulator of the analyzer is used to FM-demodulate the CW signal of the DUT. By setting the AF-low-pass and high-pass- filters the RMS value in the desired bandwidth can be measured.
Page 46 Test Procedures R&S SMC100A Example: IFB 2 MHz 0 Hz 30 dB AQT 50 ms 200k 150k 100k 1 AP CLRWR -50k -100k -150k -200k Center 1 GHz 5 ms/ Frequency Modulation Summary Coupling Carrier Offset 45.639 Hz Deviation +peak 12.93 Hz Carrier Power -0.91 dBm...
Page 47 R&S SMC100A Test Procedures Residual AM Test assembly Connect spectrum analyzer to RF socket of the DUT. Test method The FM demodulator of the analyzer is used to AM-demodulate the CW signal of the DUT. By setting the AF-low-pass and high-pass- filters the RMS value in the desired bandwidth can be measured.
Page 48 Test Procedures R&S SMC100A Example: IFB 2 MHz 5 dB AQT 200 ms 1 AP CLRWR Center 1 GHz 20 ms/ Amplitude Modulation Summary Modulation Depth 0.022 % Carrier Power -0.87 dBm Modulation +peak 0.022 % Modulation Frequency --- Hz -peak -0.023 % Sampling Rate...
Page 49 R&S SMC100A Test Procedures Level Data Level Uncertainty Test method The level uncertainty is measured in two steps. First, the frequency response is measured at a fixed level with high frequency resolution. Then the level dependant uncertainty is measured at fixed frequencies over the specified range.
Page 50 Test Procedures R&S SMC100A Test method for low levels Test principle Low levels can only be measured using a frequency selective measurement instrument. Spectrum analyzers with digital IF are best suited for this measurement due to their low linearity error. The absolute accuracy of these analyzers is not sufficient for this measurement.
Page 51 R&S SMC100A Test Procedures Output Impedance Test assembly "Test Assembly for Output Impedance (VSWR)" (page 1.5) Test method For the VSWR measurement of a source the effect of the level control must be taken into account. For this purpose, an auxiliary generator is used which transmits a wave with a slightly offset carrier frequency into the DUT.
Page 52 Test Procedures R&S SMC100A Setting Time (only for Option R&S SMC-K4) Test assembly Connect the spectrum analyzer (Table 1-1, item 18) to the RF connector of the DUT. Test method The spectrum analyzer is operated as a fast level meter in zero span. A controller transfers the start and the stop level via the IEC/IEEE bus.
Page 53 R&S SMC100A Test Procedures Internal Modulation Generator Frequency accuracy The LF-Generator is integrated into an FPGA clocked with the same reference frequency as the synthesizer. Therefore, the LF frequency has the same accuracy as the RF and has not to be measured.
Page 54 Test Procedures R&S SMC100A Level Accuracy and Frequency response Test equipment AC voltmeter (Table 1-1, item 14) Test method The output level of the LF Generator is measured direct with an AC voltmeter. Test setup Connect the AC voltmeter to the LF socket of the DUT. Measurement of Level Settings on DUT: Accuracy...
Page 55 R&S SMC100A Test Procedures Amplitude Modulation AM Setting Uncertainty Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Measurement of accuracy Settings on DUT: versus modulation depth RF On Frequency 150 MHz Level: 0 dBm Amplitude Modulation On AM Source Internal LF Gen Frequency 1 kHz Settings on analyzer:...
Page 56 Test Procedures R&S SMC100A Measurement of accuracy Settings on DUT: versus RF RF On Frequency recommended test frequencies Level: 0 dBm Amplitude Modulation On AM Source Internal LF Gen Frequency 1 kHz AM Depth 80 % Settings on analyzer: AMPTD REF LEVEL 6 dBm, FREQ CENTER same as DUT...
Page 57 R&S SMC100A Test Procedures AM Distortion Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Measurement Settings on DUT: RF On Level 0 dBm Amplitude Modulation menu: LF Gen Frequency 1 kHz Source Internal AM depth 30%. Settings on R&S FSQ: AMPTD / REF LEVEL 6 dBm, FREQ / CENTER test frequency...
Page 58 Test Procedures R&S SMC100A AM Frequency Response Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Measurement Settings on DUT: RF On Level 0 dBm Amplitude Modulation menu: Source External External Coupling DC AM depth 60%. Settings on R&S FSQ: AMPTD / REF LEVEL 6 dBm FREQ / CENTER test frequency FM DEMOD,...
Page 59 R&S SMC100A Test Procedures Synchronous PhiM with AM Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Measurement Settings on DUT: RF On Level PEP = P 0 dBm Amplitude Modulation menu: LF Gen Frequency 1 kHz Source Internal AM depth 30%.
Page 60 Test Procedures R&S SMC100A Frequency Modulation Test Methods Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Test Method "FFT The FM deviation and distortion are determined by digital signal Demodulation (Option FS-K7)" processing in the spectrum analyzer. Settings on R&S FSQ: AMPTD / REF LEVEL test level, FREQ / CENTER test frequency...
Page 61 R&S SMC100A Test Procedures FM Distortion Test Method FFT Demodulation (see chapter "Test Methods") Measurement Settings on DUT: RF On Level 0 dBm: Frequency Modulation menu: State on FM Source Internal LFGen Frequency 2 kHz. Settings on R&S FSQ: DEMOD BW 5 * FM deviation, RANGE / DEVIATION PER DIV 250 kHz, RESULT DISPLAY / FM, AF SPECTRUM, SWEEP / MEAS TIME 50 ms,...
Page 62 Test Procedures R&S SMC100A FM Frequency Response Test Method FFT Demodulation (see chapter "Test Methods") Measurement Settings on DUT: RF On Level 0 dBm Frequency 23 MHz Frequency Modulation menu: FM Source External FM Ext Coupling DC FM deviation: 100 kHz Setting on the signal generator: The internal LF generator of the signal generator delivers the modulation signal to the external modulation input of the DUT.
Page 63 R&S SMC100A Test Procedures Measurement Settings on DUT: RF On Level 0 dBm Frequency Modulation menu: State on FM Source Internal FM deviation 40 kHz LFGen Frequency 1 kHz. Settings on spectrum analyzer AMPTD / REF LEVEL 6 dBm FREQ / CENTER test frequency FMDEMOD, FMDEMOD ON, RESULT DISPLAY / AM / AF Spectrum...
Page 64 Test Procedures R&S SMC100A Carrier Frequency Offset with FM Test assembly See section "Standard Test Assembly for Analog Modulations", page 1.3. Measurement Settings on DUT: RF On Level 0 dBm Frequency 1 GHz Frequency Modulation menu: State on FM Source Internal FM deviation 1 MHz LFGen Frequency 10 kHz.
Page 65 R&S SMC100A Test Procedures Phase Modulation PhiM Setting Uncertainty Test Method FFT Demodulation (see chapter "Test Methods"). Measurement Settings on DUT: RF On Level 0 dBm Phase Modulation menu: State on PhiM Source Internal PhiM Deviation 2.5 rad LFGen Freq = 1 kHz Settings on spectrum analyzer: see chapter "Test...
Page 66 Test Procedures R&S SMC100A PhiM Distortion Test Method FFT Demodulation (see chapter "Test Methods") Measurement Settings on DUT: RF On Level 0 dBm Phase Modulation menu: State on PhiM Source Internal LFGen Frequency 10 kHz Settings on R&S FSQ: see chapter "Test Methods"...
Page 67 R&S SMC100A Test Procedures PhiM Frequency Response Test method FFT Demodulation (see chapter "Test Methods"). Measurement Settings on DUT: RF On Level 0 dBm Phase Modulation menu: PhiM Source External PhiM Ext Coupling DC PhiM deviation: 5 rad Setting on the signal generator: The internal LF generator of the signal generator delivers the modulation signal to the external modulation input of the DUT.
Page 68 Test Procedures R&S SMC100A Pulse Modulation ON/OFF Ratio Test equipment Spectrum analyzer (Table 1-1, item 18) Pulse generator (Table 1-1, item 13) Test setup To determine the ON/OFF ratio, connect the spectrum analyzer to the RF output socket of the DUT and let the PULSE EXT input open.
Page 69 R&S SMC100A Test Procedures Rise/ Fall Time Test assembly "Test Assembly for Pulse Modulation" (see page 1.3) Test method The RF signal is down converted to 0 Hz in phase. Thus, the IF output reproduces the RF amplitude vs. time. Measurement Setting on pulse generator: For adjustment statically high level,...
Page 70 Test Procedures R&S SMC100A Video Crosstalk Test assembly As above for ON/OFF Ratio Measurement Setting on pulse generator: Square wave pulse sequence with a frequency of 100 kHz, TTL level Setting on DUT: RF On Frequency 1 GHz, 6 GHz Level 0 dBm Pulse Modulation State On Settings on the Analyzer...
Page 71 R&S SMC100A Test Procedures Pulse Generator PULSE VIDEO Test equipment Storage oscilloscope (Table 1-1, item 3) with 50 W Feed-through termination on input. Test setup Connect the PULSE VIDEO socket on the rear of the DUT to the storage oscilloscope. Measurement Setting on DUT: Pulse Modulation menu:...
Page 73 R&S SMC100A Contents – Procedures after Module Replacement Contents - Chapter 2 "Procedures after Module Replacement" 2 Procedures after Module Replacement ................2.1 Procedures after Replacing the Basis Board ................2.2 Adjustments ............................2.2 Internal Adjustments ........................2.2 Adjustments of the Complete Unit....................2.2 External Adjustments Requiring Measurement Equipment .............2.2 External Level Correction ......................2.3 Recalibration ........................2.3 Adjustment of internal Reference Frequency................2.4...
Page 75 R&S SMC100A Procedures after Module Replacement 2 Procedures after Module Replacement This chapter describes all necessary measures to restore the performance of the R&S SMC after module replacement. There are no manual adjustments to be performed. Internal and external adjustment routines are implemented for this purpose.
Page 76 Procedures after Module Replacement R&S SMC100A Procedures after Replacing the Basis Board Required equipment USB Memory Stick (at least 128 MB) Required software: Actual SMC_Firmware see R&S homepage www.rohde-schwarz.com Copy the firmware to the root folder of the memory stick. Install the new Firmware See Chapter 4 “Software Update“.
Page 77 R&S SMC100A Procedures after Module Replacement External Level Correction External level correction measures output power over frequency and level and stores the correction values inside the instrument to maintain level accuracy. The R&S SMC provides a build in measuring procedure for external level correction. NOTICE Risk of damage to the power sensor Power sensor NRP-Z91 can be damaged when being exposed to R&S SMCs...
Page 78 Procedures after Module Replacement R&S SMC100A Adjustment of internal Reference Frequency The frequency accuracy of the synthesizer is determined (set to internal reference) by a 20 MHz VTCXO or when the Option R&S SMC-B1 is fitted with a highly stable OCXO that is set to a calibrated frequency standard at the R&S factory.
Page 79 R&S SMC100A Contents – Repair Contents – Chapter 3 "Repair" 3 Repair ..............................3.1 Purpose .............................3.1 Instrument Design and Function Description ................3.1 RF Board ..........................3.3 Internal and external 10 MHz reference ................3.3 TCXO 20 MHz crystal oscillator ..................3.3 RF Synthesizer/DDS......................3.3 Harmonics filters ......................3.4 LF generator ........................3.4 Pulse generator and Pulse Modulator ................3.4 Modulation matrix and AM/FM//M modulator ...............3.4...
Page 80 Contents – Repair R&S SMC100A Troubleshooting ? Reference Oscillator option R&S SMC-B1 ..........3.28 Input and Output Signals .....................3.28 Error Messages Concerning the Reference Oscillator Module ........3.29 Frequency Error, Reference Oscillator Adjustment............3.29 Module Replacement ........................3.30 Required tools ........................3.30 Overview of the Modules......................3.30 After replacing an assembly....................3.31 Safety Instruction ........................3.32 Dismounting the tube ......................3.33...
Page 81 R&S SMC100A Purpose 3 Repair Purpose NOTICE Validity • This version of the document describes the instrument R&S SMC100A starting with Serial Number 102000. • It differs from former versions in a new front unit caused by a new TFT display. For service purposes the front unit can be replaced by the new version in all •...
Page 82 Instrument Design and Function Description R&S SMC100A The R&S SMC100A consists of very few main modules and very few connections between these modules. The main units are: • Power Supply • Basis Board which includes all digital external Interfaces, the main CPU, the Fan control logic, the hardware drivers for the front panel and the Interface for the RF Board •...
Page 83 R&S SMC100A Instrument Design and Function Description RF Board The RF BOARD contains the complete measuring hardware of the instrument. The RF and LF signals are generated and modulated on the module. The output level is controlled by a level control loop controlling the level before the step attenuator.
Page 84 Instrument Design and Function Description R&S SMC100A Harmonics filters The output signal of the frequency dividers is a square wave signal. To reach the guaranteed harmonic performance (see datasheet) the harmonics of the RF signal have to be suppressed. Due to the wide RF frequency range multiple filters are needed.
Page 85 R&S SMC100A Instrument Design and Function Description Step Attenuator and reverse power protection Due to the limited dynamic range of the ALC RF detector the regulated RF signal is attenuated with passive attenuators. The step attenuator is a settable attenuator with known attenuation. At the RF output of the RF Board a reverse power protection circuitry detects RF power fed into the RF Board from outside the instrument.
Page 86 Instrument Design and Function Description R&S SMC100A Switching regulators Switching regulators for 1.2 V, 1.8 V, 3.3 V, 7 V and 28 V supply voltages: These supply voltages are generated by means of switching regulators. Controller Central Controller of the R&S SMC100A including all memory devices and external interfaces. FPGA (SMB_COM) This FPGA performs data processing for the serial bus, which sends setting data to the modules.
Page 87 R&S SMC100A Troubleshooting Troubleshooting The purpose of these troubleshooting instructions is to help to trace down malfunctions to board level. The instrument can thus be made ready for use again by means of board replacement. If error tracing doesn’t show clear results, we recommend that you ship your instrument to our experts in the service centers (see address list) for module replacement and further error elimination.
Page 88 Troubleshooting R&S SMC100A Switch-On Problems The yellow LED on the front panel, next to the ON/OFF Button is directly connected to the Standby Voltage of the power supply (via a resistor on the Basis Board) and is therefore a good indicator of the basic working of the power supply.
Page 89 R&S SMC100A Troubleshooting • Error: Instrument cannot be switched on. Action Possible error causes and further steps Check power-on switch on the rear. Power switch OFF: Switch on power supply. Check fuses on the rear. Check yellow LED (standby). LED remains unlit: Measure standby voltage at pin1 X101 (see Fig.
Page 90 Troubleshooting R&S SMC100A Fig. 3-2 Red LED location on the Basis Board • Error: Fan does not work Description of error Possible error causes and further steps Fan does not work Disconnect fan and check voltage on Basis Board X116 (fan connector) between pin 1 and 2 (see Fig.
Page 91 R&S SMC100A Troubleshooting Problems with Booting • Error: Unit does not start the application After switch-on, the signal generator first runs the Boot Loader. The Boot Loader displays the R&S Logo. The Boot Loader loads the FPGAs on the Basis Board and on the RF Board. After successful initialization of the computer (approx.
Page 92 Troubleshooting R&S SMC100A Keyboard and Rotary Knob Test • This utility allows you to check for proper operation of all front panel control elements Normal action Error, possible causes and corrective action Test called with SETUP - Check Front Panel… An image of the front panel appears with gray keys.
Page 93 R&S SMC100A Troubleshooting Troubleshooting with Internal Self Test The internal selftest checks the instrument by measuring internal diagnostic points. In case of an instrument fail this check should always be done first. Execute - Selftest. The selftest reports the modules failing the test: SETUP To see the details of the selftest select the board failing the selftest: If the Basis Board fails this test check the fuses and supply voltages from the power supply (see...
Page 94 Troubleshooting R&S SMC100A Troubleshooting with Internal Test Points The Protection menu provides access to the unlocking of protected service functions (authorized personnel of R&S Service Departments only). To deactivate the protection, the correct password has to be entered. After the instrument has been switched on, the protection levels 1 to 5 are automatically activated.
Page 95 R&S SMC100A Troubleshooting Module Test Point Function Basis Board DIAG_SMB_BAB_ADCGRD -25 mV 25 mV Reference Ground DIAG_SMB_BAB_P7V 6.4 V 7.6 V Supply Voltages DIAG_SMB_BAB_P5V 4.6 V 5.4 V DIAG_SMB_BAB_P3V3 3.1 V 3.5 V DIAG_SMB_BAB_P12V 12.2 V 14.3 V DIAG_SMB_BAB_P0V9 0.88 V 0.92 V DIAG_SMB_BAB_P28V 25.8 V...
Page 96 Troubleshooting R&S SMC100A Troubleshooting with Internal Adjustments Various internal adjustments are necessary for correct operation of the instrument. The failure of a certain adjustment can shorten troubleshooting considerably. The affected module is the RF Board module. Note: Failed internal adjustments can also be queried on the info page -> History. Normal action Error, possible causes and corrective action Internal adjustments call:...
Page 97 R&S SMC100A Troubleshooting Instrument Faults The following table lists R&S SMC100A Faults. For every fault additional test are described to determine the defective module. Fault Test Action if test fails RF Output Level is R&S SMC100A settings: Check the mating torque of the wrong SMA-connector at cable W 212 being 80 N Instrument Preset...
Page 98 Troubleshooting R&S SMC100A Fault Test Action if test fails Poor Harmonic R&S SMC100A settings: Most probably the RF Board is defective. Distortion Check the RF Board being supplied correct Instrument Preset (see page 3.23). Reference internal RF on ATT-Mode Auto Level = Maximum guaranteed level for harmonic distortion (see datasheet) Measure the level of the fundamental frequency with a...
Page 99 R&S SMC100A Troubleshooting Fault Test Action if test fails 10 MHz Reference R&S SMC100A setting: R&S SMC100A without Reference Oscillator Output faulty R&S SMC-B1: Setup Reference internal Most probably the RF Board is defective. Measure 10 MHz reference output signal with spectrum Check the RF Board being supplied correct analyzer or frequency counter and power meter.
Page 100 Troubleshooting R&S SMC100A Fault Test Action if test fails Amplitude The AM is specified only up to the Peak Envelope Power Most probably the RF Board is defective. Modulation Faulty (PEP) noted in the datasheet. The PEP value of an AM Check the RF Board being supplied correct signal with depth m at setting level P is (see page 3.23).
Page 101 R&S SMC100A Troubleshooting Troubleshooting – Basis Board Module Supply Voltages Before Troubleshooting on the Basis Board switch the R&S SMC100A on and measure the supply voltages on its power supply connector (X101, see Fig. 3-4) and compare them to the values specified in the table below.
Page 102 Troubleshooting R&S SMC100A Fuses Switch on the R&S SMC100A and measure the voltage drop across the fuses F3 – F7 (yellow marked Fig. 3-4) with a multimeter. The voltage across every fuse should be in the range -100 mV … +100 mV.
Page 103 R&S SMC100A Troubleshooting Troubleshooting A RF Board module The tests listed below ensure that an assumed error on the RF Board module is not caused by a defective or incorrectly connected cable, incorrect adjustment or another module. A comprehensive test of the module is to run the internal selftest and the internal adjustments. See chapters "Troubleshooting with Internal Self Test"...
Page 104 Troubleshooting R&S SMC100A Control Signals The control signals of the RF Board can be measured at test points on the bottom side of the RF Board nearby the ribbon cable connection (W222) to the Basis Board. (see Fig. 3-6). Signals going to the RF Board are colored red and signals coming from the RF Board are colored blue.
Page 105 R&S SMC100A Troubleshooting Measure these signals Test point Function Signal at normal operation Defective Q4, Q6, Q14, Q15 Logic Control Signals Check the serial number of the RF Board Basis Board displayed in the GUI: Logic Control Signal RF Board SETUP - Hardware-Config…...
Page 106 Troubleshooting R&S SMC100A Error Messages Concerning the RF Board Module Error message Error correction “ALC unlocked” Automatic Level Control ALC exceeds upper bound. Set attenuator mode “Auto”. "Synthesis main-loop PLL unlocked" Execute Internal Adjustment "Adjust Synthesis". If the error message does not disappear change the module. "Synthesis adjustment failed"...
Page 107 R&S SMC100A Troubleshooting Frequency Error Error Error correction Internal reference frequency: The frequency accuracy of the synthesizer is determined (set to internal reference, without option R&S SMC-B1 OCXO) by a highly stable 20 MHz Frequency error greater than limit given in quartz oscillator that is set to a calibrated frequency standard at the R&S datasheet factory.
Page 108 Troubleshooting R&S SMC100A Troubleshooting A Reference Oscillator option R&S SMC-B1 If a frequency error is observed which is greater than specified in the data sheet try to adjust the center frequency of the reference oscillator (see chapter 2 “Adjustment of internal Reference Frequency”). If it is not possible to meet the specifications by adjusting the center frequency the module is defective and should be replaced.
Page 109 R&S SMC100A Troubleshooting Error Messages Concerning the Reference Oscillator Module Error message Error correction "OCXO 10 MHz oven cold” If this message does not disappear after 10 minutes, OCXO is defective, change the module. "Synchronization error on internal reference" Switch the R&S SMC100A to external Reference and supply a 10 MHz 10 dBm signal to the Reference Input of the RF BOARD.
Page 110 Module Replacement R&S SMC100A Module Replacement This section describes in detail the replacement of modules. Chapter 5 provides information on how to order spare parts; it contains the list of mechanical parts with order numbers and the illustrations for module replacement. Required tools •...
Page 111 R&S SMC100A Module Replacement After replacing an assembly After you have replaced one of the assemblies, certain adjustments, functional checks or performance tests have to be carried out. Please refer to chapter 2 “Procedures after module replacement”. 1411.4060.82 3.31...
Page 112 Module Replacement R&S SMC100A Safety Instruction CAUTION Danger of injury For module replacement, ensure that the instrument is switched off and disconnected from the power supply by removing the plug from the AC and DC power connector. Read all safety instructions at the beginning of this manual carefully before module replacement! Only Rohde &...
Page 113 R&S SMC100A Module Replacement Dismounting the tube Put the instrument on the protective front corners. Unscrew the four screws of the 2 protective rear corners (rear right (550) and rear left (540)) on both sides and take them off. Pull off the tube R&S SMC100A (510). When mounting the tube, take care not to damage or pull off cables! Mounting the tube Put the instrument on the protective front corners.
Page 114 Module Replacement R&S SMC100A Replacing Fuse NOTICE Risk of damage to the instrument Ensure that the power supply cord is disconnected. If you are not using the supplied spares, be sure to use fuses of the same type and rating. Switch off the instrument.
Page 115 R&S SMC100A Module Replacement Replacing the Front Unit (A300) (See drawings Front Unit 1411.4802.01, Front Connector Plate 1411.4748.00 and R&S SMC100A 1411.4002.01). NOTICE The new front unit 1411.4802.02 can be used on Basis Board 1406.6700.04 with change index starting from 4.00. Removing the Front Unit A300 (1411.4802.02) Switch off the instrument and pull the mains plug.
Page 116 Module Replacement R&S SMC100A Pull off the flex. switch board cable (403) from X112, the flex-strip cable W310 (413) from X111 and the flex-strip cable of the display (408) from X2113 from the Basis Board 2 A100 (150). Slice up the cable tie (208) and disconnect the cables W214 Mod Ext – RF Board (650), the W215 LF- RF Board (660) and W212 (630).
Page 117 R&S SMC100A Module Replacement Install the Front Unit A300 (1411.4802.02) Move the Front Unit A300 (400) backwards. Connect the cables W214 Mod Ext – RF Board (650), the W215 LF- RF Board (660) and W212 (630) and fix them with the cable tie (208). Plug in the flex.
Page 118 Module Replacement R&S SMC100A Connect the four screws (401), two on the top side and two on the bottom side of the front unit A300 (400). Move the front cover R&S SMC100A (500) and the protective corner front left and right (520) and (530) back and screw it with the four screws.
Page 119 R&S SMC100A Module Replacement Replacing the TFT Display (A330), Encoder Board (A310), Flex. Switch Board, Pushbutton Board Set, the key frame and front corner plate It is recommended to replace the front unit as a whole. Principally, it is possible to replace the individual components of the front unit (see drawing 1411.4802.01).
Page 120 Module Replacement R&S SMC100A Removing the flex. switch Board, the Pushbutton-Set and the key frame Removing the Front Unit A300 (400) (see page 3.35). Remove the Knob (416) from the front side of the R&S SMC100A. Removing the TFT Display A330 (see above) Unscrew the five screws (406) an remove the key frame (405), the push-button board R&S SMC100A (404) and the flex.
Page 121 R&S SMC100A Module Replacement Removing the Encoder Board A310 Removing the Front Unit A300 (400) (see page 3.35). Remove the Knob (416) from the front side of the R&S SMC100A. Unscrew the two screws (412) and remove the encoder board A310 (411). Removing the front corner plate Dismounting the tube (see page 3.33).
Page 122 Module Replacement R&S SMC100A Install the Flex. switch Board, the Pushbutton Set, the key frame and the TFT Display A330 Move the key frame (405), the push-button board R&S SMC100A (404), the flex. switch board (403) back and screw them with the five screws (406). NOTICE Put the flex.
Page 123 R&S SMC100A Module Replacement Place the TFT display (408) and the shielding plate (410) in the mounting through (402) and screw the five screws (407). NOTICE When installing the display, make sure it is free of dust and fingerprints. Move the Knob (416) on the front side of the R&S SMC100A. Install the Front Unit A300 (400) (see page 3.37).
Page 124 Module Replacement R&S SMC100A Install the Encoder Board A310 Move the encoder board A310 (411) and screw it with the two screws (412). Move the Knob (416) on the front side of the R&S SMC100A. Install the Front Unit A300 (400) (see page 3.37). 1411.4060.82 3.44...
Page 125 R&S SMC100A Module Replacement Install the front corner plate Move the front corner plate (414) backwards and screw it with the four screws (406). Install the Front Unit A300 (400) (see page 3.37). Mounting the tube (see page 3.33). 1411.4060.82 3.45...
Page 126 Module Replacement R&S SMC100A Replacing the Power Supply A50 (see drawing 1411.4002.01). Removing the Power Supply A50 Switch off the instrument and pull the mains plug. Dismounting the tube (see page 3.33). Disconnect the three combinations screws (160) on the back side of the instrument. Disconnect the two screws (206) from the power supply holder 1/2 (204) Pull of the power supply cable from X101 from the Basis Board 2 A100 (150).
Page 127 R&S SMC100A Module Replacement Install the Power Supply A50 Move the power supply into the instrument and push it backwards. Plug the power supply cable in X101 from the Basis Board 2 A100 (150). Connect the power supply holder1/2 (204) with the two screws (206) on both sides of the instrument. Connect the three combinations screws (160) on the back side of the instrument.
Page 128 Module Replacement R&S SMC100A Replacing the Basis Board 2 (A100) (see chapter 5, drawing 1411.4002.01). Removing the Basis Board 2 Switch off the instrument and pull the mains plug. Dismounting the tube (see page 3.33). Removing the power supply (see page 3.46). Unscrew the three combinations screws (160) on the back side of the instrument.
Page 129 R&S SMC100A Module Replacement Unscrew the six screws (160) from the Basis Board 2 A100 (150). Pull off the IEC Bus Cable W108 (710) from X108, the fan cable from X116 and W222 cable BB-RF Board (440) from X103. Remove the Basis Board 2 A100 (150). 1411.4060.82 3.49...
Page 130 Module Replacement R&S SMC100A Installing the Basis Board 2 Move the Basis Board 2 A100 (150). Connect the IEC Bus Cable W108 (710) on X108, the fan cable on X116 and W222 cable BB-RF Board (440) on X103. Screw the six screws (160) to the Basis Board 2 A100 (150). Connect the flex.
Page 131 R&S SMC100A Module Replacement Replacing the SIM Card A110 NOTICE When changing the Basis Board 2, you have to remove the SIM card. The SIM card is part of your instrument and will not be replaced by Rohde & Schwarz if lost.
Page 132 Module Replacement R&S SMC100A Replacing the RF-Board (A200) (see drawing 1411.4002.01). Removing the RF-Board Note: If the R&S SMC-B1 (Reference Oscillator) option is installed, uninstall this option first (see page 3.57). Switch off the instrument and pull the mains plug. Dismounting the tube (see page 3.33).
Page 133 R&S SMC100A Module Replacement Unscrew the 5 screws (260) from the RF-board A200 (250) and remove the board carefully. Installing the RF-Board Place the RF-Board A200 (250) into the R&S SMC100A in the right position and fix it with 5 screws (260).
Page 134 Module Replacement R&S SMC100A Connect the Cables W214 Mod Ext – RF Board (420), W215 LF –RF Board (43), W212 (630) and the cable BB-RF-Board W222 (440). Mounting the tube (see page 3.33). 1411.4060.82 3.54...
Page 135 R&S SMC100A Module Replacement Replacing the Fan Unit (E1) (see drawing 1411.4002.01 and 1411.4348.01). Removing the Fan Unit (E1) Switch off the instrument and pull the mains plug. Dismounting the tube (see page 3.33). Disconnect the fan cable at X116 and push the rubber pins through the trough. Pull the fan unit E1 (106) upwards.
Page 136 Module Replacement R&S SMC100A Replacing the R&S SMC-B1 Install the R&S SMC-B1 Switch off the instrument and pull the mains plug. Unscrew the two combinations screws (508) and remove the rear panel 2 (507). Carefully move the reference oscillator R&S SMC-B1 forwards. Screw the reference oscillator R&S SMC-B1 with the 2 combinations screws (508).
Page 137 R&S SMC100A Module Replacement Remove the Reference Oscillator R&S SMC-B1 Unscrew the 2 combinations screws (508). Carefully remove the reference oscillator R&S SMC-B1 backwards. 1411.4060.82 3.57...
Page 139 R&S SMC100A Contents - Software Update/Installing Options Contents - Chapter 4 "Software Update/Installing Options" 4 Software Update / Installing Options ..................4.1 Installation of New R&S SMC Firmware ..................4.1 Installing the Options........................4.2 Hardware Options ........................4.2 Software Options........................4.3 1411.4060.82 I-4.1...
Page 141 R&S SMC100A Installation of New R&S SMC Firmware 4 Software Update / Installing Options This chapter contains information on firmware update, Linux operating system update and installing options to the R&S SMC. Additional manuals obtained together with a firmware update or with subsequently acquired options can be filed here.
Page 142 Installing the Options R&S SMC100A 1. Switch on the instrument and wait until it is operational. 2. Plug in the memory stick which contains the update file (previously downloaded from the Internet) to the USB interface of the instrument. 3. Wait until the software update dialog appears and confirm the update. 4.
Page 143 R&S SMC100A Installing the Options Software Options All available software options are already included in the latest firmware. They are ready to operate after they are enabled by means of a key code supplied with the option. Only if the R&S SMC is equipped with an older firmware version, a firmware update prior to enabling the software option may be required.
Page 145 R&S SMC100A Contents - Documents Contents - Chapter 5 "Documents" 5 Documents ............................5.1 Spare Parts............................5.1 Available Power Cables ........................5.2 1411.4060.82 I-5.1...
Page 147 R&S SMC100A Spare Parts 5 Documents This chapter contains the spare parts list and the documents for the complete R&S SMC unit. For gen- eral information about spare parts for our products please refer to the sheet “Procedure in Case of Ser- vice and Ordering of Spare Parts”...
Page 148 R&S SMC100A Available Power Cables Available Power Cables Table 5-1 List of power cables available Stock No. Earthed-contact connector Preferably used in DS 0006.7013.00 BS1363: 1967' 10 A, 250 V Great Britain complying with IEC 83: 1975 standard B2 DS 0006.7020.00 Type 12, 10 A, 250 V Switzerland complying with...
Page 149 R&S SMC100A Spare Parts List 1411.4060.82...
Page 155 R&S SMC100A Mechanical Drawings 1411.4060.82...

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