Service Manual VSWR Bridge and Power Divider R&S FSH-Z2
Contents
1. Performance Test Report Table 1 1 Performance Test Report ROHDE amp SCHWARZ VSWR Bridge Model R amp S FSH Z2 Order number 1145 5767 02 Serial number Date R amp S FSH Z2 Version 12 12 2003 Characteristic Actual value Measurement uncertainty Directivity 01 1 0 GHz 25 1 0 2 7 GHz 20 2 7 3 0 GHz 17 TEST Port Match Page 1 3 01 2 2 GHz 16 2 2 3 0 GHz 16 1145 5767 02 1 4 0 5 0 5 0 5 0 5 0 5 0 5 0 6 0 6 1 6 2 1 R amp S FSH Z2 Adjustment 2 Adjustment The R amp S FSH Z2 does not have any possibilities for adjustment 1145 5767 02 2 1 E 1 R amp S FSH Z2 3 Repair Instrument Design and Functional Description This chapter describes the design of the R amp S FSH Z2 simple measures for repair and troubleshooting and in particular the replacement of parts Instrument Design and Functional Description The following figure shows a schematic diagram of the R amp S FSH Z2 TP4 HH ae L T c1 TP2 AR q po a a oH i 3 50E R1 RO KIB 4 E CO 1 2 Aa 50E 12E J2_ SMA 11 RF INPUT Lo y Kc e T Ed E E L 50E Coax_TL_Transt A R5 R4 12E 50E J3_ SMA Relay dcaw TEST Pa in BWR mode S Fig 3 1 Schematic Diagram R amp S FSH Z2 E 1 1145 5767 02 3 1 Instrument Design and Functional Description R amp S FSH Z2 Description of the block diagram The R amp S FSH Z2 has two states In the first state2. FSH Z2 Performance Test Checking the directivity Test equipment Spectrum Analyzer refer to section Measurement Equipment and Accessories item 1 50 Ohm termination refer to section Measurement Equipment and Accessories item 4 Short Circuit termination refer to section Measurement Equipment and Accessories item 3 Test setup gt Mount the R amp S FSH Z2 on to the spectrum analyzer item 1 Spectrum Analyzer settings PRESET FREQ START FREQ 10 MHz STOP FREQ 3 GHz BW MANUAL VIDEO BW 3 kHz MEAS TRACKING GEN MEASURE REFLECT CAL CONTINUE Measurement gt Connect the Short Circuit termination item 3 to the TEST Port of the R amp S FSH Z2 gt Press softkey CONTINUE on the Spectrum Analyzer gt Replace the Short Circuit termination item 3 on the TEST Port of the R amp S FSH Z2 with the 50 Ohm termination item 4 gt The curve shows the directivity limited by returnloss of the used 50 Ohm termination item 4 Hint gt As far as the datasheet states only typical values the test limits are some dB worse than these numbers 1145 5767 02 1 2 E 2 R amp S FSH Z2 Performance Test Checking the Return Loss of the TEST Port Test principle Test equipment Test setup Spectrum Analyzer settings Measurment 1145 5767 02 Measure the returnloss of the TEST port of the DUT using a Standing Wave Ratio Bridge Spectrum Analyzer
3. it functions as a SWR bridge In the second state it functions as a power divider which can be used for Distance To Fault measurements The R amp S FSH Z2 contains a 5V relay which can be used to switch between the two states The relay can be activated through the cable assembly ending with a 7 pol Binder connector SWR Bridge This state is used for the Standing Wave Ratio measurement J4 AN GEN OUTPUT E T Zo Zo FSA J2 ya RF INPUT fo Balun T c Z c E TEST lo Fig 3 2 Principle Diagram Circuit in SWR Bridge state Power Divider This state is used for the Distance To Fault measurement RF INPUT GEN OUTPUT 4 Zo TEST ERY O Zo Fig 3 3 Principle Diagram Circuit in Power Divider state 1145 5767 02 3 2 E 1 R amp S FSH Z2 Spare Part Replacement Spare Part Replacement This section describes the service concept and contains the spare parts list and the basic documents for the R amp S FSH Z2 instrument Note The numbers indicated in brackets refer to items in the mechanical exploded drawings Note The words left and right in the manual always refer to the front view of the instrument e Please pay close attention to the safety instructions in Caution the front section of this manual e Safeguard the replacement site against electrostatic discharge to preve
4. refer to section Measurement Equipment and Accessories item 1 SWR bridge refer to section Measurement Equipment and Accessories item 2 Short circuit termination refer to section Measurement Equipment and Accessories item 3 Precision Adapter refer to section Measurement Equipment and Accessories item 5 Two 50 Ohm terminations N female refer to section Measurement Equipment and Accessories item 6 Adapter refer to section Measurement Equipment and Accessories item 7 Cable refer to section Measurement Equipment and Accessories item 8 Connect TG output of the spect Analyzer item1 to RF input of SWR Bridge item 2 using adapter item 7 Connect output of the SWR Bridge item 2 to the RF input of the spect analyzer using cable item 8 Connect the Short Circuit termination item 3 onto the TEST Port of the SWR Bridge item 2 PRESET FREQ START FREQ 10 MHz STOP FREQ 3 GHz BW MANUAL VIDEO BW 3 kHz MEAS TRACKING GEN MEASURE TRANSM CAL CONTINUE gt gt Connect the two 50 Ohm terminations item 6 to the ports GEN OUTPUT and RF INPUT of the R amp S FSH Z2 Remove Short Circuit termination item 3 from TEST port of the SWR Bridge item 2 Connect TEST port of the DUT with the TEST port of the SWR Bridge item 2 using an precision adapter item 5 The curve shows the return loss of the DUT 1 3 E 2 Performance Test Report
5. N OUTPUT port Mount the new connector item 07 by first screwing it onto the SMA connector of the PCB Fasten the N connector with 2 screws S2 into the metal bottom cover Mount the metal top cover item 03 Fasten the other four screws S2 from the N connectors Fasten the 6 screws S3 of the metal top cover Close the instrument as described earlier VV VV VV VV VV V WV 1145 5767 02 3 9 E 1 Troubleshooting R amp S FSH Z2 Troubleshooting Malfunctions can have simple causes but can also be due to faulty components or modules These troubleshooting instructions can be used to locate causes of error down to spare parts level and to return the instrument to operability by replacing parts Note When problems occur first check whether any connections cables plug in connections of boards etc are damaged or incorrectly connected Overview of errors causes and possible corrective actions This section lists various errors and the suggested corrective action Troubleshooting problems e Error Directivity of R amp S FSH Z2 shows a resonance bump at frequencies higher than 2 GHz Troubleshooting procedure Possible cause of error and further steps Check the N connector of the TEST Port The N connector of the TEST Port is soiled Clean or replace this female N connector e Error Troubleshooting procedure Possible cause of error and further steps Check Cause of error Y Repair Action Next Check Repair A
6. ROHDE amp SCHWARZ Test and Measurement Division Service Manual VSWR Bridge and Power Divider R amp S FSH Z2 10 MHz to 3 GHz 1145 5767 02 Printed in the Federal Republic of Germany R amp S FSH Z2 Contents Contents 1 Performance Test dc ei 14 Test instructions eeni eieiei etic ds 1 1 Measuring Equipment and Accessories 00 cece cence eee ener ee eeeeaeeeeeeaaeeeeeeaaeeeeeeeaaeeeenenaeeeeneaaes 1 1 Performance Test E A aoa 1 2 Checking the A cece eeeeeeeeeaeeeeeeeeceaeeeeaaeseaeeseeeeeeaaeedeaaeeseaeeeseaeeseaaeeneneeeeeeee 1 2 Checking the Return Loss of the TEST Port c ccccccccceeeeeeeeceeeee see eeeaeseeaeeeeeeeseaeeeseaeeseeeeennees 1 3 Periormance Test Repo cocoa lada 1 4 TI vated EE 2 1 Bi PROTO ANE EE E E tate cnet EE E AEA A lake att lite ss AS 3 1 Instrument Design and Functional Description 0 ccc cence ee eeneeeeeeaeeeeeeaaeeeeeeeaeeeeneaaes 3 1 Description of the block diagram oooonoccccnnnnccconnnoccccnononcccnonorccn nan rccn anar rc nn rr 3 2 SWR Bridge viii ias 3 2 Powor DMI isla idad 3 2 Spare Part Replacement taikiai aa iai iaiaeiaeiaa keiina 3 3 Overview of the spare Parts oooooconnnniinncccnnccconocnnnnnncnoncc conca cnn nacen 3 4 Opening the instrUMeNtd ococcconnnncnnnccnnncccnoncnn nana na non no cc conocerme 3 4 Closing the instrument vita ni nein ia ede 3 4 Replacing the Top BottoOM COVES oooococcccnnnoccconononcncnnnonc cnn nan n cnn nan nn nn nn nn nar
7. a sheet are the guaranteed limits e All non used ports are supposed to be terminated with a 50 Ohm load e Inputs for settings during measurements are shown as following lt KEY gt Press a key on the front panel eg SPAN lt SOFTKEY gt Press a softkey e g MARKER gt PEAK lt nn unit gt Enter a value and terminate by entering the unit e g 12 kHz Successive entries are separated by e g BW MANUAL RES BW 3 kHz Measuring Equipment and Accessories Type of Specifications recommended Equipment R amp S order equipment recommended no Spectrum Frequency 10 MHz to 3 GHz R amp S FSH 1145 5850 13 Directivity Analyzer with TG InsertionLoss output ReturnLoss 2 SWR Bridge Directivity gt 40 dB RL testport gt R amp S ZRB 2 0373 9017 53 ReturnLoss 20 dB Short Circuit 10 MHz to 3 GHz R amp S FSH Z30 1145 5773 02 Directivity Termination N type male ReturnLoss 50 Q termination 10 MHz to 3 GHz R amp S FSH Z31 1145 5780 02 Directivity N male Return loss lt 35 dB InsertionLoss ReturnLoss Precision N male to N male Huber amp Suhner ReturnLoss Adapter 32 N 50 0 51 50 Q termination 10 MHz to 3 GHz Pasternack ReturnLoss N female 2x PE6032 Adapter N male to N male Huber amp Suhner ReturnLoss 32 N 50 0 1 Cable Flexible cable RG213 U with N Pasternack male connector on both sides PE3496 12 L approx 30 cm InsertionLoss ReturnLoss 1145 5767 02 1 1 E 2 Performance Test R amp S
8. astic Top Bottom Cover 1157 3506 00 06 Power Cable Assembly Binder connector 1157 3512 00 07 10 Coax Cable Assembly 1157 3529 00 09 S2 N connector for TEST Port 1157 3535 00 07 S2 N connector for GEN OUTPUT Port 1157 3541 00 03 04 07 09 SWR DTF Unit 1157 3558 00 2 S3 S4 Note The references can be found in the exploded drawing in Chapter 3 1145 5767 02 4 3 E 1
9. ction 1145 5767 02 3 10 E 1 R amp S FSH Z2 Shipping of Instrument and Ordering of Spare Parts 4 Documents This chapter provides information on how to order spare parts and it also contains the spare parts list 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 When shipping the instrument be sure to provide sufficient mechanical and anti static protection gt Repack the instrument as it was originally packed The antistatic packing foil prevents unintentional electrostatic charging from occurring gt 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 Shipping of a module When shipping a modu
10. lacement Replacing the Top Bottom covers Housing parts 01 Top cover 02 Bottom cover Notes When replacing the bottom cover the existing type plate must be placed on the new bottom cover or the old series number must be written on the new type plate gt Open the instrument as described earlier gt Replace the specific cover gt Close the instrument as described earlier Fig 3 5 Location of the power cable assy and the coax cable assy in the bottom cover 1145 5767 02 3 5 E 1 Spare Part Replacement R amp S FSH Z2 Replacing the power cable assembly See exploded view for references gt Open the instrument as described earlier gt Remove the defective power cable assembly Loosen screw S4 Remove black shrink sleeve and desolder the two wires from the two pins Remove the ferrite bead item 06 1 and the black wire tule item 06 2 Fig 3 6 Take the new power cable assy and slide the black wire tule item 06 2 to 14 5 cm gt Fig 3 7 Put the wires through the ferrite bead item 06 1 Fig 3 8 Solder the wires to the pins 1145 5767 02 3 6 E 1 R amp S FSH Z2 Spare Part Replacement gt Fig 3 9 Mount the grounding wire with soldertag to the unit using screw S4 gt Close the instrument as described earlier 1145 5767 02 3 7 E 1 Spare Part Replacement R amp S FSH Z2 Replacing the coax cable assembly See exploded view for references gt Open the instru
11. le be sure to provide sufficient mechanical and antistatic protection gt Ship the module in a sturdy padded box gt Wrap the board in antistatic foil If the packaging is antistatic but not conductive additional conductive packaging is required The ad ditional packaging is not required if the enclosed packaging is conductive 1145 5767 02 4 1 E 1 Shipping of Instrument and Ordering of Spare Parts R amp S FSH Z2 Ordering spare parts To deliver replacement parts promptly and correctly we need the following information e R amp S order 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 order number to be used when ordering replacement parts and modules as well as power cables can be found further below Refurbished modules gt Refurbished modules are an economical alternative to original modules It should be kept in mind that refurbished modules are not new but repaired and fully tested parts They may have signs of use but they are electrically and mechanically equivalent to new modules gt To find out which refurbished modules are available please contact your Rohde amp Schwarz repre sentative or the central service division at Rohde amp Schwarz in Munich Return of defective replaced modules gt Defective modules of the replacement program that can be repaired may be returned wi
12. ment as described earlier Fig 3 10 Connect the coax assy item 10 to the N SMA connector item 07 using a torque wrench gt Fig 3 11 Connect the coax assy item 10 to the unit using a torque wrench gt Bend the coax assy as shown in Fig 3 5 gt Close the instrument as described earlier 1145 5767 02 3 8 E 1 R amp S FSH Z2 Spare Part Replacement Replacing the N connector of the TEST Port Open the instrument as described earlier Loosen the 6 screws S3 from the metal top cover Loosen the top two screws S2 from both N connectors Remove the metal top cover item 03 Remove the bottom two screws S2 from the N connector of the TEST port Remove the faulty N connector of the TEST port Mount the new connector item 09 by first screwing it onto the SMA connector of the PCB Fasten the N connector with 2 screws S2 into the metal bottom cover Mount the metal top cover item 03 Fasten the other four screws S2 from the N connectors Fasten the 6 screws S3 of the metal top cover Close the instrument as described earlier V VvVvVovV VV VV VV WV Replacing the N connector of the GEN OUTPUT Port Open the instrument as described earlier Loosen the 6 screws S3 from the metal top cover Loosen the top 2 screws S2 from both N connectors Remove the metal top cover item 03 Remove the bottom two screws S2 from the N connector of the GEN OUTPUT port Remove the faulty N connector of the GE
13. nt damage to electronic compo nents e The following two methods of ESD protection can be ene used together or separately Wrist strap with cord to ground connection Conductive floor mat and heel strap combination Building ground Look a Ground connection TE of operational site B Heel strap Floor mat PT LL Fig 3 4 Exploded View 1145 5767 02 3 3 E 1 R amp S FSH Z2 Spare Part Replacement Overview of the spare parts Table 3 1 List of spare parts and order numbers Reference Part R amp S Order Number 01 02 S1 Plastic Top Bottom Cover 1157 3506 00 06 Power Cable Assembly Binder connector 1157 3512 00 07 10 Coax Cable Assembly 1157 3529 00 09 52 N connector for TEST Port 1157 3535 00 07 S2 N connector for GEN OUTPUT Port 1157 3541 00 03 04 07 09 SWR DTF Unit 1157 3558 00 2 S3 S4 Note The references can be found in the exploded drawing on the previous page Opening the instrument See exploded drawing for related numbers gt Loosen the four screws S1 gt Turn the instrument so that the bottom with type plate touches the table gt Remove the top cover item 01 Closing the instrument gt Place the top cover item 01 gt Turn the instrument so that the top cover touches the table gt Fasten the four screws S1 1145 5767 02 3 4 E 1 R amp S FSH Z2 Spare Part Rep
14. ran 3 5 Replacing the power cable assembly ooooooonoccccnonocccononoccccnononcconono nono naar cnn nan rc rr 3 6 Replacing the coax cable assembly oooococonnncccononocccnnonoconononccnnnnnn cr rn cnn 3 8 Replacing the N connector of the TEST POlticicicinicininncnnncnnnncccconncnnccnnn no cn nac c cnn narran cnn 3 9 Replacing the N connector of the GEN OUTPUT POftooocincccnccconociconocanonocccancnnanncnanannnancccnnncnnns 3 9 TroUbleShootiNJ voii tt att A 3 10 Overview of errors causes and possible Corrective actiONS ooonooccccnnnccccnonocnccnononnncnnnannnnnnns 3 10 Troubleshooting problems 0ccooonoccccnnnoccconnnocccnnononccnnnnonc ara iii ia 3 10 1145 5767 02 1 1 E 2 Contents R amp S FSH Z2 4 Documental e eta bl e en e dd 4 1 Shipping of Instrument and Ordering of Spare Parts ooooocooonoccconccccoccccconccononcnanccconncnnnnncnana cnn 4 1 Shipping OF HSTHUMEN iii dd a data 4 1 SHIPPING Of a MOGUIC erisa sran e rita 4 1 Ordering spate Parts vacuna tii 4 2 Refurbished Modules oasiak ai 4 2 Return of defective replaced modules ooonocccccnnocccononoccccnononcconononc cnn nan ccnn nro cnnn rr cnn 4 2 Spare PartS 45 0 ie A atk aes ether ae EA a eg 4 3 1145 5767 02 1 2 E 2 R amp S FSH Z2 Test Instructions 1 Performance Test Test Instructions e Values specified in the following sections are not guaranteed Only the technical specifications provided on the data sheet are binding e The values specified in the dat
15. thin 3 months after delivery of the replaced module A repurchasing value is credited gt Excluded are parts that cannot be repaired e g PCBs that are burned broken or damaged by repair attempts incomplete modules or parts that have endured heavy mechanical damage gt Defective parts must be sent back with an accompanying document of returned items containing the following information e R amp S order number serial number and designation of the removed part e Precise description of the error e R amp S order number serial number and designation of the instrument the part was removed from e Date of part removal e Name of the technician who exchanged the part gt A document of returned items is provided along with each replacement module 1145 5767 02 4 2 E 1 R amp S FSH Z2 Spare Parts Spare Parts The R amp S Order numbers necessary for ordering replacement parts and modules can be found in the spare part lists provided below Important Note When replacing a module please pay careful attention to the safety instructions and the repair instructions provided in chapter 3 and at the beginning of this serv ce manual When shipping a module be sure to provide sufficient mechanical and antistatic protection List of RES FSH Z2 spare parts The following table lists available spare parts together with their R amp S order numbers Table 4 1 Reference Part R amp S Order Number 01 02 S1 Pl
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