Rohde & Schwarz FSH-Z2 User manual

Test and Measurement
Division
Service Manual
VSWR Bridge and Power Divider
R&S FSH-Z2
10 MHz to 3 GHz
1145.5767.02
Printed in the Federal
Republic of Germany

R&S FSH-Z2 Contents
1145.5767.02 I.1 E-2
Contents
1 Performance Test.......................................................................................................................1.1
Test Instructions...............................................................................................................................1.1
Measuring Equipment and Accessories ........................................................................................1.1
Performance Test .............................................................................................................................1.2
Checking the directivity...............................................................................................................1.2
Checking the Return Lossof the TEST Port...............................................................................1.3
Performance Test Report.................................................................................................................1.4
2 Adjustment....................................................................................................................................2.1
3 Repair..............................................................................................................................................3.1
Instrument Design and Functional Description ............................................................................3.1
Description of the block diagram ................................................................................................3.2
SWR Bridge................................................................................................................................3.2
Power Divider..............................................................................................................................3.2
Spare Part Replacement ..................................................................................................................3.3
Overview of the spare parts........................................................................................................3.4
Opening the instrument...............................................................................................................3.4
Closing the instrument................................................................................................................3.4
Replacing the Top/Bottom covers...............................................................................................3.5
Replacing the power cable assembly .........................................................................................3.6
Replacing the coax cable assembly............................................................................................3.8
Replacing the N connector of the TEST Port..............................................................................3.9
Replacing the N connector of the GEN OUTPUT Port...............................................................3.9
Troubleshooting.............................................................................................................................3.10
Overview of errors, causes, and possible corrective actions....................................................3.10
Troubleshooting problems ...........................................................................................3.10

Contents R&S FSH-Z2
1145.5767.02 I.2 E-2
4 Documents.................................................................................................................................................4.1
Shipping of Instrument and Ordering of Spare Parts...................................................................4.1
Shipping of instrument................................................................................................................4.1
Shipping of a module..................................................................................................................4.1
Ordering spare parts...................................................................................................................4.2
Refurbished modules..................................................................................................................4.2
Return of defective replaced modules ........................................................................................4.2
Spare Parts........................................................................................................................................4.3

R&S FSH-Z2 Test Instructions
1145.5767.02 1.1 E-2
1 Performance Test
Test Instructions
•Values specified in the following sections are not guaranteed. Only the technical specifications
provided on the data sheet are binding.
•The values specified in the data sheet are the guaranteed limits.
•All non used ports are supposed to be terminated with a 50 Ohm load.
•Inputs for settings during measurements are shown as following:
[<KEY>] Press a key on the front panel, eg [SPAN].
[<SOFTKEY>] Press a softkey, e.g. [MARKER -> PEAK].
[<nn unit>] 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
Item Type of
equipment Specifications recommended Equipment recommended R&S order no. Use
1 Spectrum
Analyzer with TG
output
Frequency: 10 MHz to 3 GHz R&SFSH1145.5850.13 Directivity
InsertionLoss
ReturnLoss
2 SWR Bridge Directivity > 40 dB , RL testport >
20 dB R&S ZRB 2 0373.9017.53 ReturnLoss
3 Short Circuit
Termination 10 MHz to 3 GHz N-type male R&S FSH-Z30 1145.5773.02 Directivity ReturnLoss
4 50-Ω termination
N-male 10 MHz to 3 GHz Return loss ≤-35 dB
R&S FSH-Z31 1145.5780.02 Directivity
InsertionLoss
ReturnLoss
5 Precision
Adapter N-male to N-male Huber&Suhner: 32 N-50-0-51 ReturnLoss
6 50-Ω termination
N-female (2x) 10 MHz to 3 GHz Pasternack:
PE6032 ReturnLoss
7 Adapter N-male to N-male Huber&Suhner:
32 N-50-0-1 ReturnLoss
8 Cable Flexible cable RG213/U with N-
male connector on both sides.
L=approx 30 cm
Pasternack:
PE3496-12 InsertionLoss ReturnLoss

Performance Test R&S FSH-Z2
1145.5767.02 1.2 E-2
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: ¾Mount the R&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: ¾Connect the Short Circuit termination (item 3) to the "TEST" Port of the
R&S FSH-Z2
¾Press softkey [ CONTINUE ] on the Spectrum Analyzer.
¾Replace the Short Circuit termination (item 3) on the "TEST" Port of
the R&S FSH-Z2 with the 50 Ohm termination (item 4).
¾The curve shows the directivity (limited by returnloss of the used 50
Ohm termination, item 4).
Hint: ¾As far as the datasheet states only typical values, the test limits are
some dB worse than these numbers!

R&S FSH-Z2 Performance Test
1145.5767.02 1.3 E-2
Checking the Return Loss of the TEST Port
Test principle: Measure the returnloss of the TEST port of the DUT using a Standing
Wave Ratio Bridge
Test equipment: - Spectrum Analyzer (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)
Test setup: ¾Connect TG output of the spect. Analyzer (item1) to RF input of SWR
Bridge (item 2) using adapter (item 7)
¾Connect output of the SWR Bridge (item 2) to the RF input of the
spect. analyzer using cable (item 8).
¾Connect the Short Circuit termination (item 3) onto the TEST Port of
the SWR Bridge (item 2).
Spectrum Analyzer settings: - [ PRESET]
- [ FREQ ]
- [ START FREQ : 10 MHz ]
- [ STOP FREQ : 3 GHz ]
- [ BW : MANUAL VIDEO BW : 3 kHz ]
- [ MEAS : TRACKING GEN : MEASURE ]
- [ TRANSM CAL : CONTINUE ]
Measurment: ¾Connect the two 50 Ohm terminations (item 6) to the ports "GEN
OUTPUT" and "RF INPUT" of the R&S FSH-Z2
¾Remove Short Circuit termination (item 3) from TEST port of the SWR
Bridge (item 2).
¾Connect TEST port of the DUT with the TEST port of the SWR Bridge
(item 2) using an precision adapter (item 5)
¾The curve shows the return loss of the DUT.

Performance Test Report R&S FSH-Z2
1145.5767.02 1.4 E-2
Performance Test Report
Table 1-1 Performance Test Report
ROHDE & SCHWARZ VSWR Bridge Version 12 12 2003
Model ( ): R&S FSH-Z2
Order number: 1145.5767.02
Serial number:
Date:
Characteristic Included in Min. value Actual value Unit Measurement
uncertainty
Directivity
.01 .. 1.0 GHz
1.0 .. 2.7 GHz
2.7 .. 3.0 GHz
Page 1.2
25
20
17
________
________
________
DB
dB
dB
+0.5/-0.5
+0.5/-0.5
+0.5/-0.5
TEST Port Match
.01 .. 2.2 GHz
2.2 .. 3.0 GHz
Page 1.3
16
16
________
________
dB
dB
+0.6/-0.6
+1.6/-2.1

R&S FSH-Z2 Adjustment
1145.5767.02 2.1 E-1
2 Adjustment
The R&S FSH-Z2 does not have any possibilities for adjustment.

R&S FSH-Z2 Instrument Design and Functional Description
1145.5767.02 3.1 E-1
3 Repair
This chapter describes the design of the R&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&S FSH-Z2.
Fig. 3-1 Schematic Diagram R&S FSH-Z2

Instrument Design and Functional Description R&S FSH-Z2
1145.5767.02 3.2 E-1
Description of the block diagram
The R&S FSH-Z2 has two states. In the first state 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&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.
Fig. 3-2 Principle Diagram: Circuit in SWR Bridge state
Power Divider
This state is used for the Distance To Fault measurement.
Fig. 3-3 Principle Diagram: Circuit in Power Divider state

R&S FSH-Z2 Spare Part Replacement
1145.5767.02 3.3 E-1
Spare Part Replacement
This section describes the service concept and contains the spare parts list and the basic documents for
the R&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.
Caution!
Wrist strap with cord
Building ground
Floor mat
Ground connection
of operational site
Heel strap
•Please pay close attention to the safety instructions in
the front section of this manual.
•Safeguard the replacement site against electrostatic
discharge to prevent damage to electronic compo-
nents.
•The following two methods of ESD protection can be
used together or separately:
- Wrist strap with cord to ground connection
- Conductive floor mat and heel strap combination
Fig. 3-4 Exploded View

Spare Part Replacement R&S FSH-Z2
1145.5767.02 3.4 E-1
Overview of the spare parts
Table 3-1 List of spare parts and order numbers
Reference Part R&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/S2 N-connector for TEST Port 1157.3535.00
07/S2 N-connector for GEN OUTPUT Port 1157.3541.00
03/04/07/09/
S2/S3/S4 SWR-DTF Unit 1157.3558.00
Note: The references can be found in the exploded drawing on the previous page.
Opening the instrument
(See exploded drawing for related numbers.)
½Loosen the four screws (S1).
½Turn the instrument so that the bottom with type plate touches the table.
½Remove the top cover (item 01).
Closing the instrument
½Place the top cover (item 01).
½Turn the instrument so that the top cover touches the table.
½Fasten the four screws (S1).

R&S FSH-Z2 Spare Part Replacement
1145.5767.02 3.5 E-1
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.
½Open the instrument as described earlier.
½Replace the specific cover.
½Close the instrument as described earlier.
Fig. 3-5 Location of the power cable assy and the coax cable assy in the bottom cover.

Spare Part Replacement R&S FSH-Z2
1145.5767.02 3.6 E-1
Replacing the power cable assembly
(See exploded view for references).
½Open the instrument as described earlier.
½Remove 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)
½
Fig. 3-6 Take the new power cable assy and slide the black wire tule (item 06.2) to 14.5 cm
½
Fig. 3-7 Put the wires through the ferrite bead (item 06.1).
½
Fig. 3-8 Solder the wires to the pins.

R&S FSH-Z2 Spare Part Replacement
1145.5767.02 3.7 E-1
½
Fig. 3-9 Mount the grounding wire with soldertag to the unit using screw (S4)
½Close the instrument as described earlier.

Spare Part Replacement R&S FSH-Z2
1145.5767.02 3.8 E-1
Replacing the coax cable assembly
(See exploded view for references).
½Open the instrument as described earlier.
½
Fig. 3-10 Connect the coax assy (item 10) to the N-SMA connector (item 07) using a torque wrench
½
Fig. 3-11 Connect the coax assy (item 10) to the unit using a torque wrench.
½Bend the coax assy as shown in Fig. 3-5
½Close the instrument as described earlier.

R&S FSH-Z2 Spare Part Replacement
1145.5767.02 3.9 E-1
Replacing the N connector of the TEST Port
½Open the instrument as described earlier.
½Loosen the 6 screws (S3) from the metal top cover.
½Loosen the top two screws (S2) from both N-connectors.
½Remove the metal top cover (item 03).
½Remove the bottom two screws (S2) from the N-connector of the TEST port.
½Remove the faulty N-connector of the TEST port.
½Mount the new connector (item 09) by first screwing it onto the SMA connector of the PCB.
½Fasten the N-connector with 2 screws (S2) into the metal bottom cover
½Mount the metal top cover (item 03).
½Fasten the other four screws (S2) from the N connectors.
½Fasten the 6 screws (S3) of the metal top cover.
½Close the instrument as described earlier.
Replacing the N connector of the GEN OUTPUT Port
½Open the instrument as described earlier.
½Loosen the 6 screws (S3) from the metal top cover.
½Loosen the top 2 screws (S2) from both N-connectors.
½Remove the metal top cover (item 03).
½Remove the bottom two screws (S2) from the N-connector of the GEN OUTPUT port.
½Remove the faulty N-connector of the GEN OUTPUT port.
½Mount the new connector (item 07)by first screwing it onto the SMA connector of the PCB.
½Fasten the N-connector with 2 screws (S2) into the metal bottom cover
½Mount the metal top cover (item 03).
½Fasten the other four screws (S2) from the N connectors.
½Fasten the 6 screws (S3) of the metal top cover.
½Close the instrument as described earlier.

Troubleshooting R&S FSH-Z2
1145.5767.02 3.10 E-1
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
•Error: Directivity of R&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.
•Error: .....
Troubleshooting procedure Possible cause of error and further steps
Check .... ⇓Cause of error.
Repair Action.
Next Check .... Repair Action.

R&S FSH-Z2 Shipping of Instrument and Ordering of Spare Parts
1145.5767.02 4.1 E-1
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 & 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 & 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:
•Instrument model
•Serial number
•Detailed error description in case of repair
•Contact partner for checkbacks
Shipping of instrument
When shipping the instrument, be sure to provide sufficient mechanical and anti-static protection:
½Repack the instrument as it was originally packed. The antistatic packing foil prevents unintentional
electrostatic charging from occurring.
½If 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 module, be sure to provide sufficient mechanical and antistatic protection:
½Ship the module in a sturdy, padded box.
½Wrap 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.

Shipping of Instrument and Ordering of Spare Parts R&S FSH-Z2
1145.5767.02 4.2 E-1
Ordering spare parts
To deliver replacement parts promptly and correctly, we need the following information:
•R&S order number (refer to the spare part lists in this chapter)
•Designation
•Number of units
•Instrument type for the replacement part
•Contact person for possible questions
The R&S order number to be used when ordering replacement parts and modules as well as power
cables can be found further below.
Refurbished modules
½Refurbished 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.
½To find out which refurbished modules are available, please contact your Rohde & Schwarz repre-
sentative (or the central service division at Rohde & Schwarz in Munich).
Return of defective replaced modules
½Defective modules of the replacement program that can be repaired may be returned within 3
months after delivery of the replaced module. A repurchasing value is credited.
½Excluded 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.
½Defective parts must be sent back with an accompanying document of returned items containing
the following information:
•R&S order number, serial number and designation of the removed part
•Precise description of the error
•R&S order number, serial number and designation of the instrument the part was removed from
•Date of part removal
•Name of the technician who exchanged the part
½Adocument of returned items is provided along with each replacement module.