R&S FSH-Z44 Service Manual
Contents
1. 1165 2692 82 1 4 E 1 R amp S FSH Z44 Quick Test Characteristic Min value Actual value Max value Directivity 0 2 GHz 0 3 GHz 0 5 GHz 0 7 GHz 1 0 GHz 1 5 GHz 1 8 GHz 2 4 GHz 3 0 GHz 3 5 GHz 4 0 GHz 1165 2692 82 1 5 E 1 R amp S FSH Z44 Contents Section 2 Contents 2 Adj stm nt apc a a ettet aca aes ac NECATUS d OE rec EIE 2 1 Preliminary RematkKs a ROI RP UR OR Re t RR E Rs 2 1 1165 2692 82 1 2 1 E 1 R amp S FSH Z44 Preliminary Remarks 2 Adjustment Preliminary Remarks Adjusting the Directional Power Sensor R amp S FSH Z44 to the accuracy level specified in the data sheet requires the use of special measurement equipment beyond that offered by most calibration laborato ries Thus the adjustment procedures are not described here Instead sensors requiring repair or ones whose calibration interval has expired should be sent to Rohde amp Schwarz Central Service where the sensors will be recalibrated and readjusted 1165 2692 82 2 1 E 1 R amp S FSH Z44 Contents Section 3 Contents 3 Repair of Directional Power Sensor R amp S FSH Z44 s 3 1 Design and Circuit Description ssssssssssssssseseneeeennenen nennen nennen nnne nennen nnns 3 1 Block DiagraM ut ee no edu hei don 3 1 Description of the Block Diagram sse nnne nnne nnne 3 2 Co pler boatrd AT ct e ete hh ee tai n ated diee te2. Error source within base unit Replace defective cable in cable set or exchange mainboard Error source within sensor Open sensor and check connection of sensor cable W1 with controller board Replace sensor cable Send sensor in for repair controller board possibly defective The power sensor detected an error error message Power Sensor Hardware Error Potential error source and further corrective steps The sensor detected an error during selfttest or during communication hardware fault or defective voltage supply Error source within base unit e g voltage supply Replace mainboard Error source within sensor Send sensor in for repair analog board or controller board is defective E 1 Troubleshooting Problems during measurement R amp S FSH Z44 e Error Measured power readings are erroneous Troubleshooting instruction Check the RF connectors for damage Perform quick test as described in section 1 1165 2692 82 Potential error source and further corrective steps Removable socket s damaged Replace the damaged RF connector see instruction on page 3 7 The measured values are highly erroneous Send in the sensor for repair coupler board or analog board defective The test limits are only slightly exceeded This means that the sensor hardware is probably OK Send in the sensor for calibration 3 10 E 1 R amp S FSH Z44 Contents Section 5 Contents 5 DOC
3. 1165 2692 82 1 1 E 1 Quick Test R amp S FSH Z44 Measuring Equipment and Accessories for Quick Test Type of unit Recommended characteristics Recommended R amp S order Application units number Spectrum To connect the DUT R amp S FSH 1145 5850 03 Zeroing absolute analyzer 1145 5850 13 measuring accuracy 1145 5850 23 directivity matching 2 Power meter To connect the sensor specified in R amp S NRP 1143 8500 02 Zeroing absolute item 3 measuring accuracy 3 Power sensor Measurement uncertainty absolute R amp S NRP Z23 1137 8002 02 Zeroing absolute lt 0 12 dB in range from 200 MHz to measuring accuracy 4 GHz at 4 W power 4 Signal 200 MHz to 4 GHz 13 dBm R amp S SMT06 1039 2000 06 Absolute measuring generator accuracy directivity 5 Power ampilfier 200 MHz to 4 GHz output power Absolute measuring 5 W gain 225 dB GENES NN idend directivity Harmonics filter To suppress harmonics at the power Absolute measuring amplifier output harmonics suppres accuracy directivity sion of gt 25 dB required Checking Zeroing Test setup See Fig 1 1 Setting on signal generator RF OFF level switched off Setting on R amp S FSH PRESET MEAS MEASURE POWER SENSOR ZERO CONTINUE Test of R amp S FSH Message Power Sensor Zero OK Display value within the limits of the test report 1165 2692 82 1 2 E 1 R amp S FSH Z44 Quick Test Checking Absolute Measuring Accuracy and Dire
4. amp ROHDE amp SCHWARZ Test and Measurement Division Service Manual Power Sensor R amp S FSH Z44 1165 2305 02 Printed in the Federal Republic of Germany 1165 2692 82 01 1 R amp S FSH Z44 Contents Section 1 Contents 1 Performance TeSt 3 ono EA 1 1 Preliminary HemalrkKs E 1 1 QUICK TES AS aera een etc e e iiie irat ias 1 1 Test Instf ctloris s ien a ts eret co ee ted te ie e tete ee eoe e boe eco buen 1 1 Ghecking Zeroing ict ttt eere bre re e uva bs dte eU YE ERES 1 2 Checking Absolute Measuring Accuracy and Directivity essen 1 3 Ure Eccc Gein ai le ea en lie ae 1 4 Test Report aea EL RUE alae ee eed ae SE ae eddie 1 4 1165 2692 82 I 1 1 E 1 List of Figures Section 1 R amp S FSH Z44 Figures Fig 1 1 Test setup for testing absolute measuring accuracy and directivity 1 3 1165 2692 82 I 1 2 E 1 R amp S FSH Z44 Preliminary Remarks 1 Performance Test Preliminary Remarks Verifying the data sheet specifications for the Directional Power Sensor R amp S FSH Z44 requires a con siderable amount of equipment and care Since the equipment needed is presently available only at Rohde amp Schwarz Central Service and at the Rohde amp Schwarz Memmingen production site a manu facturer s recalibration should be requested before the calibration interval expires A quick test is recommended for checking the sensor with simple means Quic
5. 3 2 E 1 R amp S FSH Z44 Design and Circuit Description 3 Repair of Directional Power Sensor R amp S FSH Z44 This section describes the design and simple repair and troubleshooting measures Design and Circuit Description Block Diagram F COUPLER BOARD N DIGI 1081 1509 02 1165 i x2 x12 1 i ed y i 2 iwo Rx s 1 HE GN 4 TxD 2 6 4 i 4 GN E 6 Fi FN X1 Fig 3 1 Block diagram of Directional Power Sensor R amp S FSH Z44 1165 2692 82 3 1 E 1 Design and Circuit Description R amp S FSH Z44 Description of the Block Diagram The R amp S FSH Z44 can accurately measure the power of forward and return waves over a wide power and frequency range It contains all modules necessary for analog and digital signal processing and returns completely corrected digital measurement values to the R amp S FSH base unit via a serial interface Coupler board A1 The directional coupler board A1 contains a loop directional coupler with frequency response compensation and an RF rectifier equipped with zero bias Schottky diodes for both measurement directions The rectifiers supply a power proportional output voltage for each direction for the power display on the R amp S FSH measurement direction 1 gt 2 forward is used and the matching measurement result comes from the ratio of the return and forward power Thus the power frequency re
6. UMENTS 5 1 Shipping of Instrument and Ordering of Spare Parts ssssssssssseee 5 1 Shipping of Instrument cece eeeeee cee eeeaaeeeeneeseeeeeceaeeeeaaeseaeeeseaaesesaaeseeeeeseaeeeeaeeseaeeseeeesaas 5 1 Ordering Spare Parts iiie dide doi eg FE nde da aedes Pea pais libido 5 1 Ordering Replacement Sensors sesssssssssssssssseenene ener entrent nennen snnt nn tenens 5 2 Spare PAS it e eap atte elem tn 5 3 1165 2692 82 5 1 E 1 R amp S FSH Z44 Shipping of Instrument and Ordering of Spare Parts 5 Documents This section provides information for ordering spare parts and contains the relevant documents for the Rohde amp Schwarz Directional Power Sensor R amp S FSH Z44 Shipping of Instrument and Ordering of Spare Parts Please contact your Rohde amp Schwarz support center or our spare parts express service if you need to request service repair your equipment or order spare parts and modules The list of Rohde amp Schwarz representatives and the address of our spare parts express service are provided in the front section of this service manual You will need to provide the following information in order for us to respond to your inquiries quickly and accurately and to determine whether the warranty for your instrument is still valid e Instrument model e Serial number e Detailed error description in case of repair e Contact partner for checkbacks Shipping of Instrument Wh
7. amp Schwarz Central Service Controller board A2 This module largely contains the voltage feed for the sensor i e the preparation of the different operating voltages from the 5 V supply voltage of the R amp S FSH base unit and a microcontroller for controlling instrument functions These functions include communication with the R amp S FSH base unit via a serial interface control of the analog board and preparation of the digitized raw measurement values up to the final measurement result Temperature frequency from the base unit and custom characteristic data are used to correct measurement values The characteristic data is stored in an EEPROM on the controller board and its contents can be overwritten when an adjustment is performed If the controller board is replaced a complete adjustment of the sensor must be performed afterwards only by Rohde amp Schwarz Central Service in order to load the custom characteristic data onto the new EEPROM 1165 2692 82 3 2 E 1 R amp S FSH Z44 Module Replacement Module Replacement The following section describes how to change the exterior housing and replace the connector cable and RF connectors If one of the electronic modules coupler board analog board or controller board is defective the sensor must be sent to Rohde amp Schwarz Central Service for repair Caution e Observe the safety instructions at the beginning of this manual e To avoid damaging electronic components th
8. ctivity Test setup E k ota a 2 Signal Power Harmonics Power Power generator amplifier filter sensor meter 1 R amp S FSH Fig 1 1 Test setup for testing absolute measuring accuracy and directivity Setting on signal generator RF OFF level switched off Setting on R amp S FSH PRESET MEAS MEASURE POWER SENSOR UNIT Reflection dB Return Loss ZERO CONTINUE Setting on power meter PRE SET PRE SET ZERO CAL ZERO CAL Setting on power meter FREQ 200 MHz Setting on signal generator Frequency 200 MHz level set so that the power meter displays 3641 dBm Setting on R amp S FSH FREQ 200 MHz Test Read the level on the R amp S FSH and on the power meter and then record the level deviation of the R amp S FSH in the test re port and check it Read the return loss on the R amp S FSH enter it under item 3 directivity in the test report and test it Repeat framed settings tests for the other frequency points be sure not to forget the frequency setting on the power meter and on the R amp S FSH 1165 2692 82 1 3 E 1 Quick Test R amp S FSH Z44 Test Report Quick Test Directional Power Sensor R amp S FSH Z44 Stock number 1165 2305 02 Name Serial number Characteristic Min value Actual value Max value Zeroing Absol measuring accuracy 0 2 GHz 0 3 GHz 0 5 GHz 0 7 GHz 1 0 GHz 1 5 GHz 1 8 GHz 2 4 GHz 3 0 GHz 3 5 GHz 4 0 GHz
9. e instrument should only be opened on a workplace protected against electrostatic discharges The following methods can be used separately or combined to ensure protection against electrostatic discharges Wrist strap with cord E zt e Anti static wrist strap with grounding cable LI Building ground Ly L N Ground connection of operational site Heel strap Floor mat e Conductive flooring with foot strap Tools Required Phillips head screwdriver sizes 0 and 1 Set screw wrench 2 5 mm only for replacing RF connectors Mandrel round 2 to 3 mm st Note The numeric values in brackets refer to the items in the list of module parts and d spare parts in Table 3 1 and section 5 1165 2692 82 3 3 E 1 Module Replacement R amp S FSH Z44 Unlock A Contact side Lock Fig 3 2 Membrane cable W2 SL Note Remove membrane cables Membrane cables can be removed only after unlocking the female connector Connect membrane cables Note the contact side and lock the female connector 1165 2692 82 3 4 E 1 R amp S FSH Z44 Module Replacement List of Modules Table 3 1 List of modules spare parts for the R amp S FSH 44 fee owes E CTN Ce CC A ET Lm eme C ECETIA O e ow ETC AN ESTA o form NIN CO MEE A ET MEM EEC A ECT Lm O e se CTO ANN CECI Available but not maintained in spare parts stock e delivery time may b
10. e longer Spare part not available to be replaced only by Rohde 8 Schwarz Central Service 1165 2692 82 3 5 E 1 Module Replacement R amp S FSH Z44 Opening and Reassembly Exchange of Plastic Cover Shells Opening Undo and remove two Phillips head screws 300 next to the cable inlet gt Pull the plastic cover shells 270 apart toward the rear and then completely dislodge them from one another by twisting them apart on the front side Before opening disconnect the sensor from the R amp S FSH base unit To open undo screws Fig 3 3 Opening the sensor Reassembly Place the sensor in the upper cover shell in such a manner that the lettering of the two RF connectors 7 and 20n the metal housing matches the lettering on the type label Push the lower cover shell with bracket and recess on the front side into the corresponding slots of the upper shell and press the two halves together at the rear gt Screw the housing into place on the rear side When reassembling the sensor make sure that RF connectors 1 and 2 match the lettering on the type label 1165 2692 82 3 6 E 1 R amp S FSH Z44 Module Replacement Replacement of the Cable gt Open sensor Pull off shielding cover from analog board and controller board Undo two screws 190 on flange of cable 210 and remove flange from housing Remove five screws 190 on controller board and remove board Note The analog board is fastened w
11. en shipping the instrument be sure to provide sufficient mechanical and anti static protection Repack the instrument as it was originally packed The antistatic packing foil prevents unintentional electrostatic charging from occurring If you do not use the original packaging include sufficient padding to prevent the instrument from slipping inside the package Wrap antistatic packing foil around the instrument to protect it from electrostatic charging Ordering Spare Parts To deliver replacement parts promptly and correctly we need the following information e Rohde amp Schwarz stock number refer to the spare part lists in this chapter e Designation e Number of units e Instrument type for the replacement part e Contact person for possible questions The R amp S stock number to be used when ordering replacement parts and modules as well as power cables can be found further below 1165 2692 82 5 1 E 1 Shipping of Instrument and Ordering of Spare Parts R amp S FSH Z44 Ordering Replacement Sensors Rohde amp Schwarz maintains a replacement program for a number of power sensors Within this program it is possible to provide a fully operational power sensor to replace a defective one at short notice and at a fixed price Please note that replacement sensors are used equipment but are always tested They are therefore equivalent to new sensors even though they may exhibit slight signs of use If required the delivery of replace
12. ith four screws Disconnect sensor cable W1 from controller board Installation gt Follow the reverse sequence to install the cable Replacement of the RF Connectors Removal Undo flange screws 60 and pull removable sockets 50 out of housing Use mandrel to push out any inner conductors 20 if damaged Replace damaged parts Installation After Removing Inner Conductors Replace disks 30 gt Insert the sleeves 40 in such a manner that the front bezels on the outer diameter point toward the RF connector gt Push in the inner conductor 20 Plug the removable sockets 50 to inner conductor and screw on flange 1165 2692 82 3 7 E 1 Troubleshooting R amp S FSH Z44 Troubleshooting Malfunctions may sometimes be due to simple reasons but may also result from defective components These troubleshooting instructions permit malfunctions or errors to be traced down to the module level Module replacement and further diagnostics of errors or malfunctions should be carried out by Rohde amp Schwarz customer service It is therefore recommended to send the unit to the nearest service center see list of addresses at the beginning of this manual Before opening disconnect the sensor from the R amp S FSH base unit Overview of Errors Causes and Corrective Steps This section provides an overview of possible errors their causes and corrective steps Problems that occur when connecting the sen
13. k Test The following tests are used to check the Directional Power Sensor R amp S FSH Z44 with simple means If the tests are passed compliance of the sensors with the specifications within the complete frequency and power range is largely ensured The test consists of e Zeroing e Absolute measuring accuracy e Directivity Test Instructions e The tests are to be performed at an ambient temperature of 18 C to 28 C The DUT should be connected to the activated R amp S FSH base unit for at least 30 minutes before the tests are per formed e The test limits used in the following sections are based on the data sheet but are valid only on the conditions defined for the corresponding test step They are therefore not legally binding as accuracy specifications only data sheet specifications are legally binding e The entries made on the Handheld Spectrum Analyzer R amp S FSH are abbreviated as follows lt KEY gt Press front panel key e g SPAN lt SOFTKEY gt Press softkey e g MARKER gt PEAK lt nn unit gt Enter value and confirm with unit e g 12 kHz Successive entries are separated by e g BW MANUAL RES BW 3 kHz e The DUT and the reference power meter need to be connected directly with one another if possible because connecting cables can cause measuring errors due to attenuation and reflection If test fix tures are necessary precision designs with low attenuation and reflection should be used
14. ment sensors can include a new calibration If interested please contact your nearest Rohde amp Schwarz office 1165 2692 82 5 2 E 1 R amp S FSH Z44 Spare Parts Spare Parts The Rohde amp Schwarz stock numbers necessary for ordering replacement parts and modules can be found in the spare part lists provided below List of R amp S FSH Z44 spare parts The following table lists available spare parts together with their Rohde amp Schwarz stock numbers fee owes ER m om memes EE O pem Lo qmm eme Ce fewo RN NM ow emm CIO CO oe semen E om eememeeee ECT KR C HL NN m sme err Available but not maintained in spare parts stock i e delivery time may be longer Spare part not available to be replaced only by Rohde amp Schwarz Central Service 1165 2692 82 5 3 E 1
15. netis 3 2 Analog board AS sii ore rt hee e eed teer eee t etd 3 2 Controller board Alia ete aia ea tei 3 2 Module Replacement coooocccccooocccccoooccconononcncnnnononcnnnoncnnnnno cnn nnnnnn cnn rear nn nr enn nr rr ener sten nnne ener nnns 3 3 Tools Required cra ca he em ER ERE EE B a Ri E ix D AER EAT ed 3 3 Leto Modules e e ten tatu io ed tee ad tts 3 5 Opening and Reassembly Exchange of Plastic Cover Shells sss 3 6 Replacement of the Cable ssssssssssssssssesesee entente entente enn seni sn nennen nennen 3 7 Iastallatloti ite tenete bee ita 3 7 Replacement of the RF Connectors ssssssssssssssseseeee nennen 3 7 Hemoval reet A eate edat 3 7 Installation After Removing Inner Conductors sssseseeeen 3 7 Troubleshootifig a EE a cree e rece Pe deo ae de Pere re ca Dv o Coe Yo ce ee 3 8 Overview of Errors Causes and Corrective StepS cooooocccconoconcconocnnonanononccnnonnncnnnnonnnnnnn nannten nnne 3 8 1165 2692 82 I 3 1 E 1 List of Figures and Tables Section 3 R amp S FSH Z44 Figures Fig 3 1 Block diagram of Directional Power Sensor R amp S FSH Z44 ssssssssse 3 1 Fig 3 2 Membrare cable W2 5 2 ahaa tas didi enti diss 3 4 Fig 3 3 OPENING the Sensor ci rr titi er tn Eheim dh a re ar ie 3 6 Tables Table 3 1 List of modules spare parts for the R amp S FSH 44 sse 3 5 1165 2692 82 I
16. sor or activating the power measurement function on the R amp S FSH base unit e Error The power sensor is not found neither measured values nor error messages are displayed on the R amp S FSH base unit Troubleshooting instruction Potential error source and further corrective steps Disconnect sensor from base unit and check male Defective connection and temale conmectors tot damage Exchange sensor cable or connector block 8 1157 3287 00 in the R amp S FSH U Check whether the error also occurs on a different Error source within base unit Bei ult Replace defective cable in cable set or exchange mainboard Error source within sensor Open sensor and check connection of sensor cable W1 with controller board Replace sensor cable Send sensor in for repair controller board possibly defective 1165 2692 82 3 8 E 1 R amp S FSH Z44 e Error Troubleshooting instruction Disconnect sensor from base unit and check male and female connectors for damage y Check whether the error also occurs on a different base unit e Error Troubleshooting instruction y Check whether error also occurs on a different base unit 1165 2692 82 3 9 Troubleshooting R amp S FSH base unit detected an error error message Power Sensor Error Potential error source and further corrective steps Defective connection Exchange sensor cable or connector block 8 1157 3287 00 in the R amp S FSH
17. sponse of the sensor is largely determined by the loop coupler and RF rectifier for direction 1 gt 2 while the blocking to forward resistance relevant for the matching measurements is primarily influenced by the loop coupler for direction 221 and the two RF connectors Since the directional couplers are stable over a long life cycle partly due to the protected position on the inside of the housing the RF connectors are the first items that should be replaced if the blocking to forward resistance is not adequate see page 3 7 If the directional coupler needs to be repaired send the sensor to Rohde amp Schwarz Central Service Analog board A3 On the analog board A3 the output voltages of the RF rectifiers that are supplied via X1 are amplified while keeping noise and drift values low and they are each digitized via an integrated A D converter One of the A D converters also cyclically checks the various operating voltages of the sensor and measures the output voltage of a temperature sensor in order to compensate the temperature of the RF rectifiers The A D converters are connected to the controller board A2 via serial data interfaces and this board also supplies the operating voltages for the analog board via X2 Since the analog board can only be adjusted together with the coupler board and digital board i e not by itself a complete adjustment procedure must be performed on the sensor following a repair or replacement done only by Rohde
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