Tektronix WCA230A, WCA280A Service Manual

Service Manual

WCA230A & WCA280A
Portable Wireless Communication Analyzers

071-1257-02

This document applies to firmware version 3.20
and above.

Warnin g

The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

www.tektronix.com

Copyright © Tektronix. All ri ghts reserved. Licensed software products are owned by Tektronix or its subsidiaries or
suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

For product information, sales, service, and technical support:

H In North America, call 1-800-833-9200.
H Worldwide, visit www.tektronix.com t o find contacts in your area.

Warranty 2

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year
from the date of shipment. If any such product prove s defective during this warranty period, Tektronix, at its option, e ither
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
defective product. Parts, modules and replacement products used by Tektronix for warranty work may be new or
reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which t he
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or i mproper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repa ir or service the product; b) to repair
damage resulting from improper use or connection t o incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or inte grated with other
products when the effect of such modification or integration increases the time or difficulty of servicing t he product.

THIS W ARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER
WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY
PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL
NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY
OF SUCH DAMAGES.

Table of Contents

Specifications

Operating Information
Theory of Operation

General Safety Summary ix...................................

Service Safety Summary xi....................................

Preface xiii...................................................

Manual Structure xiii................................................

Manual Conventions xiv..............................................

Notice for Trigger Function xiv........................................

Finding Other Information xv.........................................

Introduction xvii..............................................

Performance Check Interval xvii........................................

Strategy for Servicing xvii.............................................

Performance Conditions 1--1...........................................

Electrical Characteristics 1--2..........................................

Physical Characteristics 1--16...........................................

Environmental Characteristics 1--16......................................

RF Input Circuit 3--1.................................................

Down Converter 3--2.................................................

Digital Signal Processing 3--3..........................................

Power Supply 3--5...................................................

External Interface 3--6................................................

Performance Verification

Conventions 4--2....................................................

Brief Procedures 4--3...........................................

Functional Tests 4--4.................................................

Diagnostics 4--8.....................................................

Performance Tests 4--9.........................................

Prerequisites 4--10....................................................

Equipment Required 4--10..............................................

Auto Tests 4--12......................................................

Manual Tests 4--21....................................................

Test Record 4--49.....................................................

WCA230A & WCA280A Service Manual

i

Table of Contents

Adjustment Procedures

Maintenance

Requirements for Performance 5--1......................................

Equipment Required 5--2..............................................

Preparation 5--3.....................................................

Self Calibration 5--16..................................................

Auto Calibration 5--20.................................................

Reference Oscillator Frequency Adjustment 5--29...........................

Reconfiguration of RF Modules 5--31.....................................

Related Maintenance Procedures 6--1....................................

Preparation 6--2.....................................................

Inspection and Cleaning 6--4...........................................

Removal and Installation Procedures 6--7.........................

Preparation 6--7.....................................................

Access Procedure 6--22................................................

Procedures for External Modules 6--23....................................

Procedures for RF Modules 6--28........................................

Procedures for CPU Board and Disk Modules 6--32..........................

Procedures for Mother Board and its Daughter Boards 6--37...................

Procedures for Power Supply Modules on the Instrument Bottom 6--45..........

Procedures for RF1 Modules on the Instrument Bottom 6--50..................

Procedures for Front Panel Modules 6--57.................................

Procedures for Chassis Modules 6--63.....................................

Troubleshooting 6--69...........................................

Troubleshooting Procedure 6--69.........................................

Symptoms and Faulty Modules 6--82.....................................

Notes for Changing Modules or Parts 6--84................................

Options
Electrical Parts List
Diagrams
Mechanical Parts List

ii

Replaceable Parts 10--1..........................................

Parts Ordering Information 10--1.........................................

Using the Replaceable Parts List 10--3....................................

WCA230A & WCA280A Service Manual

List of Figures

Table of Contents

Figure 4--1: Spectrum of the calibration signal (50 MHz, --20 dBm) 4--5

Figure 4--2: Setup display 4--6...................................

Figure 4--3: Reference level setting and A/D overflow indicator 4--7....

Figure 4--4: Spectrogram display 4--7.............................

Figure 4--5: Diagnostic screen 4--8................................

Figure 4--6: Auto test initial screen 4--12............................

Figure 4--7: Auto test result display example 4--16...................

Figure 4--8: Initial test hookup 4--22...............................

Figure 4--9: Initial hookup for setting up the power meter and

sensor 4--23................................................

Figure 4--10: Hookup for calibrating the power sensor 4--24...........

Figure 4--11: Hookup for setting the signal generator output 4--24......

Figure 4--12: Hookup for checking the absolute amplitude accuracy 4--25

Figure 4--13: Initial test hookup 4--27..............................

Figure 4--14: Initial test hookup 4--30..............................

Figure 4--15: Initial test hookup 4--36..............................

Figure 4--16: Initial test hookup 4--39..............................

Figure 4--17: Initial test hookup 4--42..............................

Figure 4--18: Initial test hookup 4--45..............................

Figure 5--1: Hookup for storing the cal factors in the power meter 5--5.

Figure 5--2: Initial test hookup 5--7...............................

Figure 5--3: Hookup for calibrating the power sensor 5--9............

Figure 5--4: Initial test hookup 5--10...............................

Figure 5--5: Hookup for calibrating the power sensor 5--12............

Figure 5--6: UNCAL display 5--16.................................

Figure 5--7: Calibration menu 5--17...............................

Figure 5--8: Center offset 5--18....................................

Figure 5--9: DC offset 5--19.......................................

Figure 5--10: Auto calibration initial screen 5--20....................

Figure 5--11: Auto cal result display example 5--24...................

Figure 5--12: Initial test hookup 5--29..............................

Figure 5--13: R232 location (top view of the card cage) 5--30...........

Figure 5--14: Test hookup 5--32...................................

Figure 5--15: Test hookup 5--33...................................

WCA230A & WCA280A Service Manual

iii

Table of Contents

Figure 6--1: Analyzer orientation 6--11.............................

Figure 6--2: External modules 6--12................................

Figure 6--3: RF modules 6--13....................................

Figure 6--4: CPU board and disk modules 6--14.....................

Figure 6--5: Mother board and its daughter boards

(S/N B020000 and above) 6--15................................

Figure 6--6: Mother board and its daughter boards

(S/N below B020000 and J300100 and above) 6--16...............

Figure 6--7: Bottom modules -- Power supply 6--17...................

Figure 6--8: Bottom modules -- RF1 (WCA230A) 6--18................

Figure 6--9: Bottom modules -- RF1 (WCA280A) 6--19................

Figure 6--10: Front panel modules 6--20............................

Figure 6--11: Chassis modules 6--21................................

Figure 6--12: Guide to removal procedures 6--22.....................

Figure 6--13: Line cord and cabinet removal 6--24...................

Figure 6--14: Front cushion removal 6--25..........................

Figure 6--15: Cabinet modules removal 6--27........................

Figure 6--16: RF modules removal 6--29............................

Figure 6--17: CPU board removal 6--33............................

Figure 6--18: Disk module removal 6--35...........................

Figure 6--19: A10 A/D board removal 6--38.........................

Figure 6--20: Daughter boards removal 6--42........................

Figure 6--21: Mother board removal 6--44..........................

Figure 6--22: Power supply 1 and 2 removal 6--46....................

Figure 6 --23: Power supply modules removal 6--48...................

Figure 6--24: RF1 modules removal -- 1 6--51........................

Figure 6--25: RF1 modules removal -- 2 (WCA230A) 6--53.............

Figure 6--26: RF1 modules removal -- 2 (WCA280A) 6--55.............

Figure 6--27: Front panel assembly removal 6--58....................

Figure 6--28: Front panel modules removal 6--59....................

Figure 6--29: LCD display removal 6--62...........................

Figure 6--30: Fan and side panel removal 6--64......................

Figure 6--31: Board guide bracket removal 6--65.....................

Figure 6--32: Rear panel modules 6--67.............................

Figure 6--33: Troubleshooting procedure 1 — Power supply system 6--70

Figure 6--34: Troubleshooting procedure 2 — Display and CPU

system 6--71................................................

Figure 6--35: Troubleshooting p rocedure 3 — Signal path 6--72........

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WCA230A & WCA280A Service Manual

Table of Contents

Figure 6--36: Top view for cable interconnection

(S/N B020000 and above) 6--77................................

Figure 6--37: Top view for cable interconnection

(S/N below B020000 and J300100 and above) 6--78...............

Figure 6--38: Bottom view for cable interconnection (WCA230A) 6--79..

Figure 6--39: Bottom view for cable interconnection (WCA280A) 6--80..

Figure 6--40: A70 DC power supply board 6--82.....................

Figure 9--1: Block diagram (S/N B020000 and above) 9--3............

Figure 9--2: Block diagram

( S/N below B020000 and J300100 and above) 9--4...............

Figure 9--3: Interconnect diagram

(WCA230A, S/N B020000 and above) 9--5......................

Figure 9--4: Interconnect diagram

(WCA230A, S/N below B020000 and J300100 and above) 9--6.....

Figure 9--5: Interconnect diagram

(WCA280A, S/N B020000 and above) 9--7......................

Figure 9--6: Interconnect diagram

(WCA280A, S/N below B020000 and J300100 and above) 9--8.....

Figure 10--1: External modules 10--5...............................

Figure 10--2: Front-panel assembly -- 1 10--7........................

Figure 10--3: Front-panel assembly -- 2 10--9........................

Figure 10--4: RF modules 10--11...................................

Figure 10--5: Mother board and its daughter boards -- 1 10--13.........

Figure 10--6: Mother board and its daughter boards -- 2 10--15.........

Figure 10--7: Disk modules 10--17..................................

Figure 10--8: Bottom modules -- Power supply 10--19..................

Figure 10--9: Bottom modules -- RF1 (WCA230A) 10--21...............

Figure 10--10: Bottom modules -- RF1 (WCA280A) 10--23..............

Figure 10--11: Bottom modules -- Interconnection 10--25...............

Figure 10--12: Chassis modules -- 1 10--27...........................

Figure 10--13: Chassis modules -- 2 10--29...........................

Figure 10--14: Rackmou nt 10--31...................................

WCA230A & WCA280A Service Manual

v

Table of Contents

List of Tables

Table 1 --1: Frequency 1--2......................................

Table 1 --2: Spectrum purity 1--2.................................

Table 1--3: Noise sideband 1--3..................................

Table 1 --4: Input 1--4..........................................

Table 1 --5: Amplitude 1--4......................................

Table 1--6: Dynamic range 1--5..................................

Table 1 --7: Spurious response 1--6...............................

Table 1 --8: Acquisition 1--7.....................................

Table 1--9: Samplin g rate 1--7...................................

Table 1--10: Frame time 1--8....................................

Table 1-- 11: Digital demodulation 1--8............................

Table 1--12: Analog demodulation 1--10............................

Table 1--13: RBW (Resolution Bandwidth) 1--11....................

Table 1--14: Trigger (S/N B020000 and above) 1--12.................

Table 1--15: Trigger (S/N below B020000 and J300100 and above) 1--12.

Table 1 --16: Measurement function 1--13...........................

Table 1--17: Display 1--13.......................................

Table 1--18: Marker, trace, and display line 1--14....................

Table 1--19: Controller and interface 1--14.........................

Table 1 --20: Power requirements 1--15.............................

Table 1--21: Power connector 1--15................................

Table 1--22: Physical characteristics 1--16..........................

Table 1--23: Environmental characteristics 1--16....................

Table 1--24: Certifications and compliances 1--17....................

Table 4 --1: Span and RBW 4--6..................................

Table 4--2: Internal diagnostic program 4--8.......................

Table 4 --3: Test equipment 4--10..................................

Table 4--4: Test item selection 4--13...............................

Table 4--5: Procedure for failed test item 4--19......................

Table 4 --6: Spurious measurement 4--41...........................

Table 5 --1: Test equipment 5--2..................................

Table 5--2: Compatibility of the spurious correction file 5--15.........

Table 5--3: Calib ration items 5--21................................

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WCA230A & WCA280A Service Manual

Table of Contents

Table 6--1: Relative susceptibility to static-discharge damage 6--3.....

Table 6--2: External inspection check list 6--5......................

Table 6--3: Internal inspection check list 6--6......................

Table 6 --4: Summary of procedures 6--9..........................

Table 6--5: Tools required for module removal 6--10.................

Table 6 --6: Normal supply voltages 6 --81...........................

Table 6--7: Test point voltages on A70 6--82.........................

Table 6--8: Symptoms and faulty modules 6--83.....................

WCA230A & WCA280A Service Manual

vii

Table of Contents

viii

WCA230A & WCA280A Service Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or

Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use.

Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.

Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.

Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.

Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Provide Proper Ventilation. Refer to t he manual’s installation instructions for

details on installing the product so it has proper ventilation.

Symbols and Terms

WCA230A & WCA280A Service Manual

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.

ix

General Safety Summary

Terms on the Product. These t erms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the
marking.

WARNING indicates an injury hazard not immediately accessible as you read the
marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbols may appear on the product:

WARNING

High Voltage

Protective Ground

(Earth) Terminal

CAUTION

Refer to Manual

x

WCA230A & WCA280A Service Manual

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service

procedures.

Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.

Disconnect Power. To avoid electric shock, switch off the instrument power, and
then disconnect the power cord from the mains power.

Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in t his product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.

To avoid electric shock, do not touch exposed connections.

WCA230A & WCA280A Service Manual

xi

Service Safety Summary

xii

WCA230A & WCA280A Service Manual

Preface

Manual Structure

This is the service manual for the WCA230A and WCA280A Portable Wireless
Communication Analyzers. The manual contains information needed to service
the analyzer to the module level.

This manual is divided into sections, such as Specifications and Theory of

Operation. Further, some sections are divided into subsections, such as
Product Description and Removal and Installation Procedures.

Sections containing procedures also contain introductions to those procedures.
Be sure to read these introductions because they provide information needed to
do the service correctly and efficiently. The manual section name and a brief
description of each is given below.

H Specifications contains a description of the analyzer and the applicable

characteristics.

H Operating Information contains a statement referring you to the WCA230A

and WCA280A User Manual.

H Theory of Operation contains circuit descriptions that support service to the

module level.

H Performance Verification contains procedures for confirming that the

analyzer functions properly and meets warranted limits.

H Adjustment Procedures contains procedures for adjusting the analyzer to

meet warranted limits.

H Maintenance contains information and procedures for performing preventive

and corrective maintenance of the analyzer. These instructions include
cleaning, module removal and installation, and fault isolation to the module.

H Options contains a statement referring you to the WCA230A and WCA280A

User Manual.

H Electrical Parts List contains a statement referring you to Mechanical Parts

List, where both electrical and mechanical modules are listed.

H Diagrams contains a block diagram and an interconnection diagram.

H Mechanical Parts List includes a table of all replaceable modules, their

descriptions, and their Tektronix part numbers.

WCA230A & WCA280A Service Manual

xiii

Preface

Manual Conventions

This manual uses certain conventions that you should become familiar with.

Some sections of the manual contain procedures for you to perform. To keep
those instructions clear and consistent, this manual uses the following conven­tions:

H Names of front panel controls and menus appear in the same case (initial

capitals, all uppercase, etc.) in the manual as i s used on the analyzer front
panel and menus. Front panel names are all upper-case letters; for example,
SPAN, TRIG, and SELECT.

H Instruction steps are numbered unless there is only one step.

Modules

Safety

Throughout this manual, any replaceable component, assembly, or part of the
analyzer is referred to generically as a module. In general, a module is an
assembly (like a circuit board), rather than a component (like a resistor or an
integrated circuit). Sometimes a single component is a module; for example, the
chassis of the analyzer is a module.

Symbols and terms related to safety appear in the Safety Summary near the
beginning of this manual.

Notice for Trigger Function

The trigger functions vary according to the product serial numbers due to the
different hardware as follows (the serial number is labeled on the bottom-right
corner of the rear panel):

H S/N B020000 and above

H S/N below B020000 and J300100 and above

In this manual, trigger-related descriptions and specifications are marked with
the appropriate serial number if necessary.

xiv

WCA230A & WCA280A Service Manual

Finding Other Information

Other documentation for the WCA230A and WCA280A analyzers includes:

H The WCA230A and WCA280A User Manual contains a tutorial to quickly

H The WCA230A and WCA280A Programmer Manual explains how to use the

Preface

describe how to operate the analyzer. It also includes an in-depth discussion
on how to more completely use the analyzer features.

GPIB interface to remotely control the analyzer.

WCA230A & WCA280A Service Manual

xv

Preface

xvi

WCA230A & WCA280A Service Manual

Introduction

This manual contains information needed to properly service the WCA230A and
WCA280A Portable Wireless Communication Analyzers as well as general
information critical to safe and effective servicing.

To prevent personal injury or damage to the analyzer, consider the following
before attempting service:

H The procedures in this manual should be performed only by a qualified

service person.

H Read the General Safety Summary and the Service Safety Summary,

beginning on page ix.

H Read Preparation for Use in section 2, Operating Information.

When using this manual for servicing, be sure to follow all warnings, cautions,
and notes.

Performance Check Interval

Strategy for Servicing

Generally, the performance check described in section 4, Performance Verifica­tion, should be done every 12 months. In addition, performance check is

recommended after module replacement.

If the analyzer does not meet performance criteria, repair is necessary.

Throughout this manual, the term “module” refers to any field-replaceable
component, assembly, or part of the analyzer.

This manual contains all the information needed for periodic maintenance of the
analyzer. (Examples of such information are procedures for checking perfor­mance.)

Further, it contains all information for corrective maintenance down to the
module level. To isolate a failure to a module, use the fault isolation procedures
found in Troubleshooting, part of section 6, Maintenance. To remove and replace
any failed module, follow the instructions in Removal and Installation Proce-
dures, also part of section 6. After isolating a faulty module, replace it with a
fully-tested module obtained from the factory. Section 10, Mechanical Parts
List, contains part number and ordering information for all replaceable modules.

WCA230A & WCA280A Service Manual

xvii

Introduction

xviii

WCA230A & WCA280A Service Manual

Specifications

Specifications

This section contains the WCA230A and WCA280A Portable Wireless
Communication Analyzers specifications. All specifications are guaranteed
unless labeled Typical. Typical specifications are provided for your convenience.

NOTE. In these tables, those warranted characteristics that are checked in the

Performance Verification appear with the n symbol in the Characteristics
column.

Performance Conditions

The performance limits in this specification are valid with these conditions:

H The analyzer must have been calibrated and adjusted at an ambient tempera-

H The analyzer must be in an environment with temperature, altitude,

ture between +20

humidity, and vibration within the operating limits described in these
specifications.

_C and +30 _C.

H The analyzer must have had a warm-up period of at least 20 minutes.

WCA230A & WCA280A Service Manual

1- 1

Specifications

Electrical Characteristics

Table 1- 1: Frequency

Characteristics Description

Measurement frequency

Frequency range Baseband: DC to 20 MHz

RF: 15 MHz to 3 GHz (WCA230A)
RF1: 15 MHz to 3.5 GHz (WCA280A)
RF2: 3.5 GHz to 6.5 GHz (WCA280A)
RF3: 5 GHz to 8 GHz (WCA280A)

Center frequency setting resolution 0.1 Hz

Frequency marker readout accuracy Baseband: ±(RE × MF + 0.001 × Span + 0.2) Hz

RF, RF1 to 3: ±(RE × MF + 0.001 × Span + 2) Hz

RE: Reference frequency error; MF: Marker frequency [Hz]

n At specified frequency Baseband, Frequency = 10 MHz, Span = 1 MHz

Marker: ±1 kHz; Carrier frequency measurement: ±1.2 Hz

RF/RF1, Frequency = 2 GHz, Span = 1 MHz

Marker: ±1.2 kHz; Carrier frequency measurement: ±210 Hz

RF2, Frequency = 5 GHz, Span = 1 MHz (WCA280A only)

Marker: ±1.5 kHz; Carrier frequency measurement: ±510 Hz

RF3, Frequency = 7 GHz, Span = 1 MHz (WCA280A only)

Marker: ±1.7 kHz; Carrier frequency measurement: ±710 Hz

Residual FM (Typical) 2Hzp--p

Span accuracy ±1bin

RBW filter bandwidth accuracy 0.1%

Reference frequency

Aging per day 1 × 10

Aging per year 1 × 10

Temperature drift 1 × 10

n Total frequency error 2 × 10

Reference output level >0 dBm

External reference input 10 MHz, --10 to +6 dBm, Spurious level <--80 dBc within 100 kHz offset

-- 9

(after 30 days of operation)

-- 7

(after 30 days of operation)

-- 7

(10to40_ C)

-- 7

(within one year after calibration)

Table 1- 2: Spectrum purity

Characteristics Description

n Spectrum purity (Frequency = 1500 MHz)

Carrier offset = 10 kHz, Span = 100 kHz --100 dBc/Hz

Carrier offset = 100 kHz, Span = 1 MHz --105 dBc/Hz

Carrier offset = 1 MHz, Span = 5 MHz --125 dBc/Hz

1- 2

WCA230A & WCA280A Service Manual

Table 1- 3: Noise sideband

Characteristics Description

Noise sideband Offset

Frequency = 1000 MHz --100 dBc/Hz

--105 dBc/Hz

--105 dBc/Hz

--105 dBc/Hz

-- 1 1 2 d B c / H z

--132 dBc/Hz

--135 dBc/Hz

--135 dBc/Hz

Frequency = 2000 MHz --96 dBc/Hz

--104 dBc/Hz

--105 dBc/Hz

--105 dBc/Hz

-- 1 1 2 d B c / H z

--132 dBc/Hz

--135 dBc/Hz

--135 dBc/Hz

Frequency = 6000 MHz
(WCA280A only)

Typical Noise sideband Offset

Frequency = 1000 MHz --103 dBc/Hz

Frequency = 2000 MHz --99 dBc/Hz

--87 dBc/Hz

--104 dBc/Hz

--105 dBc/Hz

--105 dBc/Hz

-- 1 1 2 d B c / H z

--128 dBc/Hz

--130 dBc/Hz

--130 dBc/Hz

--108 dBc/Hz

--108 dBc/Hz

--108 dBc/Hz

-- 1 1 5 d B c / H z

--135 dBc/Hz

--138 dBc/Hz

--138 dBc/Hz

--107 dBc/Hz

--108 dBc/Hz

--108 dBc/Hz

-- 1 1 5 d B c / H z

--135 dBc/Hz

--138 dBc/Hz

--138 dBc/Hz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

Specifications

WCA230A & WCA280A Service Manual

1- 3

Specifications

Table 1- 3: Noise sideband (Cont.)

Characteristics Description

Frequency = 6000 MHz
(WCA280A only)

--90 dBc/Hz

--107 dBc/Hz

--108 dBc/Hz

--108 dBc/Hz

-- 1 1 5 d B c / H z

--131 dBc/Hz

--133 dBc/Hz

--133 dBc/Hz

1kHz
10 kHz
20 kHz
30 kHz
100 kHz
1MHz
5MHz
7MHz

Table 1- 4: Input

Characteristics Description

Signal input

Input connector N type (RF and baseband input); BNC type (Option 03 IQ input)

Input impedance 50 Ω

VSWR <1.4 (2.5 GHz, RF attenuation≥10 dB)

<1.8 (7.5 GHz, RF attenuation≥10 dB, WCA280A only)

Typical <1.4 (300 kHz to 10 MHz, RF attenuation≥10 dB)

<1.3 (10 MHz to 3 GHz, RF attenuation≥10 dB)
<1.4 (3 GHz to 8 GHz, RF attenuation≥10 dB, WCA280A only)

Maximum input level

Maximum DC voltage ±0.2V (RF,RF1to3)

±5 V (Baseband)
±5 V (Option 03 IQ input)

Maximum input power +30 dBm (RF, RF1 to 3, RF attenuation≥10 dB)

Input attenuator

RF/Baseband attenuator 0 to 50 dB (2 dB step in RF/RF1/Baseband; 10 dB step in RF2/RF3)

I/Q attenuator 0 to 30 dB (10 dB step)

Table 1- 5: Amplitude

Characteristics Description

Reference level

Reference level setting range --30 to +20 dBm (2 dB step, Baseband)

--51 to +30 dBm (1 dB step, RF/RF1)

--50 to +30 dBm (1 dB step, RF2/RF3, WCA280A only)

--10 to +20 dBm (10 dB step, Option 03 IQ input)

Accuracy (--10 to --50 dBm) ±0.2 dB (at 50 MHz, 10 dB attenuation, 20 to 30 _C)

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WCA230A & WCA280A Service Manual

Table 1- 5: Amplitude (Cont.)

Characteristics Description

Frequency response (RF attenuation≥10 dB)

n at 20 to 30 _C ±0.5 dB (Baseband)

±1.2 dB (RF/RF1)
±1.7 dB (RF2, WCA280A only)
±1.7 dB (RF3, WCA280A only)

Typical ±0.3dB(100kHzto20MHz)

±0.5dB(10MHzto3GHz)
±0.5 dB (10 MHz to 3.5 GHz, WCA280A only)
±1.0 dB (3.5 GHz to 6.5 GHz, WCA280A only)
±1.0 dB (5 GHz to 8 GHz, WCA280A only)

at 10 to 40 _C ±0.7 dB (Baseband)

±1.5 dB (RF/RF1)
±2.0 dB (RF2, WCA280A only)
±2.0 dB (RF3, WCA280A only)

n Absolute amplitude accuracy at calibration
point (0 dB attenuation, 20 to 30 _C)

n Input attenuator setting uncertainty ±0.5 dB (at 50 MHz)

Level linearity in display range ±0.2dB(0to--40dBfs)

Channel power measurement accuracy for
W-CDMA signal at 20 to 30 _C (Typical)

±0.3 dB (Baseband at 10 MHz, --10 dBm signal)
±0.5 dB (at 50 MHz, --20 dBm signal)

±0.2dB(0to--50dBfs,Typical)
±0.12 dB (0 to --50 dBfs, Typical)

±0.6 dB (Signal frequency: 1900 to 2200 MHz; Signal power: +10 to --30 dBm;

RF attenuation: 0 to 20 dB; After Auto Level operation at 10 MHz span)

Specifications

Table 1- 6: Dynamic range

Characteristics Description

1 dB compression input +2 dBm (RF attenuation = 0 dB, 2 GHz)

Second harmonic distortion
(--30 dBm tone at input mixer)

3rdorder intermodulation distortion (Reference level = +5 dBm, RF attenuation = Adjusted, Total signal power = --7 dBm)

n Center frequency = 2 GHz --74 dBc

100 MHz to 3 GHz --74 dBc

3 GHz to 8 GHz (WCA280A only) --72 dBc

n Displayed average noise level --144 dBm/Hz (1 kHz to 10 kHz)

--56 dBc (10 MHz to 1500 MHz)

--56 dBc (10 MHz to 1750 MHz, WCA280A only)

--151 dBm/Hz (10 kHz to 10 MHz)

--151 dBm/Hz (10 MHz to 100 MHz)

--151 dBm/Hz (100 MHz to 1 GHz)

--150 dBm/Hz (1 GHz to 2 GHz)

--150 dBm/Hz (2 GHz to 3 GHz)

--142 dBm/Hz (3 GHz to 5 GHz, WCA280A only)

--142 dBm/Hz (5 GHz to 8 GHz, WCA280A only)

WCA230A & WCA280A Service Manual

1- 5

Specifications

Table 1- 6: Dynamic range (Cont.)

Characteristics Description

ACLR (3GPP down link, test model 1, 16 ch) 60 dB (5 MHz offset)

63 dB (10 MHz offset)

Typical 66 dB (5 MHz offset)

70 dB (10 MHz offset)

Local feed-through to input connecter

(Typical)

--40 dBm (local frequency 4.2 to 5 GHz)

--55 dBm (local frequency 5 to 6 GHz)

--60 dBm (local frequency 6 to 7 GHz)

--60 dBm (local frequency 7 to 7.7 GHz, WCA280A only)

Table 1- 7: Spurious response

Characteristics Description

Image Suppression (Typical)

1stIF 75 dB (RF/RF1)

70 dB (RF2/RF3, WCA280A only)

2ndand 3rdIF 80 dB (RF/RF1 )

75 dB (RF2/RF3, WCA280A only)

Alias suppression (Typical) 65 dB (Baseband)

n Residual response (Reference level = --30 dBm, RBW = 100 kHz)

Baseband, 1 to 20 MHz --93 dBm (Span = 20 MHz)

RF, 0.5 to 3 GHz (WCA280A) --90 dBm (Span = 2.5 GHz)

RF1, 0.5 to 3.5 GHz (WCA280A) --90 dBm (Span = 3 GHz)

RF2, 3.5 to 6.5 GHz (WCA280A) --85 dBm (Span = 3 GHz)

RF3, 5 to 8 GHz (WCA280A) --85 dBm (Span = 3 GHz)

n Spurious response (Span = 10 MHz, Reference level = 0 dBm, RBW = 50 kHz)

Baseband, 10 MHz --73 dBc (Signal frequency = 10 MHz, Signal level = --5 dBm)

RF/RF1, 2 GHz --73 dBc (Signal frequency = 2 GHz, Signal level = --5 dBm)

RF2, 5 GHz (WCA280A) --70 dBc (Signal frequency = 5 GHz, Signal level = --5 dBm)

RF3, 7 GHz (WCA280A) --70 dBc (Signal frequency = 7 GHz, Signal level = --5 dBm)

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WCA230A & WCA280A Service Manual

Table 1- 8: Acquisition

Characteristics Description

Acquisition mode Single and Continuous

Acquisition memory size 64 MB (Standard), 256 MB (Option 02)

Block size 1 to 16,000 frames (Standard), 1 to 64,000 frames (Option 02)

Number of data samples in one frame 1024 (Vector mode)

A/D converter 14 bits, 51.2 Msps

Vector span 20 MHz (Baseband), 15 MHz (RF, RF1 to 3), 20 MHz (Option 03 IQ input)

Real-time capture bandwidth 20 MHz (Baseband), 15 MHz (RF, RF1 to 3), 10 MHz (Option 03 IQ input)

Table 1- 9: Sampling rate

Characteristics Description

Sampling rate (Real Time S/A, Demod, and Time modes)

20 MHz span (Baseband) 25.6 Msps

15 MHz span (RF, RF1 to 3) 25.6 Msps

10 MHz span 12.8 Msps

5 MHz span 6.4 Msps

2 MHz span 3.2 Msps

1 MHz span 1.6 Msps

500 kHz span 800 ksps

200 kHz span 320 ksps

100 kHz span 160 ksps

50 kHz span 80 ksps

20 kHz span 32 ksps

10 kHz span 16 ksps

5 kHz span 8 ksps

2 kHz span 3.2 ksps

1 kHz span 1.6 ksps

500 Hz span 800 sps

200 Hz span 320 sps

100 Hz span 160 sps

Specifications

WCA230A & WCA280A Service Manual

1- 7

Specifications

Table 1- 10: Frame time

Characteristics Description

Frame time (Real Time S/A, Demod, and Time modes)

20 MHz span (Baseband) 40 ms

15 MHz span (RF, RF1 to 3) 40 ms

10 MHz span 80 ms

5 MHz span 160 ms

2 MHz span 320 ms

1 MHz span 640 ms

500 kHz span 1.28 ms

200 kHz span 3.2 ms

100 kHz span 6.4 ms

50 kHz span 12.8 ms

20 kHz span 32 ms

10 kHz span 64 ms

5 kHz span 128 ms

2 kHz span 320 ms

1 kHz span 640 ms

500 Hz span 1.28 s

200 Hz span 3.2 s

100 Hz span 6.4 s

Table 1- 11: Digital demodulation

Characteristics Description

Demodulator

Carrier type Continuous and Burst

Modulation format BPSK, QPSK, π/4 shift DQPSK, 8PSK, 16QAM, 64QAM, 128QAM, 256QAM,

GMSK, GFSK, ASK and FSK

Measurement filter Root cosine

Reference filter Cosine, Gauss

Filter parameter α/BT: 0.0001 to 1, 0.0001 step

Maximum symbol rate 12.8 Msps

Standard setup PDC, PHS, NADC, TETRA, GSM, CDPD, and Bluetooth

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WCA230A & WCA280A Service Manual

Specifications

Table 1- 11: Digital demodulation (Cont.)

Characteristics Description

Display format

Vector diagram Symbol/Locus display, Frequency error measurement, and Origin offset measurement

Constellation diagram Symbol display, Frequency error measurement, and Origin offset measurement

Eye diagram I, Q, and Trellis displays ( 1 to 16 symbols )

Error vector diagram EVM, Magnitude error, Phase error, Waveform quality (ρ) measurement,

Frequency error measurement, and Origin offset measurement

Symbol table Binary, Octal, Hexadecimal

AM/AM Measured amplitude vs. Reference amplitude, 1 dB compression measurement

AM/PM Phase error vs. Reference amplitude

CCDF Probability of excess vs. Power level, Crest factor measurement

PDF Probability of occurrence vs. Power level

Accuracy

PDC (100 kHz span) EVM ≤1.2%, Magnitude error ≤1.0%, Phase error ≤0.8°

PHS (1 MHz span) EVM ≤1.4%, Magnitude error ≤1.2%, Phase error ≤0.8°

GSM (1 MHz span) EVM ≤1.8%, Magnitude error ≤1.2%, Phase error ≤1.0°

64QAM, 5.3 Msps, 1 GHz carrier
(15 MHz span, Typ i cal)

QPSK, 3.84 Msps, 2 GHz carrier
(15 MHz span, Typ i cal)

QPSK EVM (Typical) Symbol rate

Center frequency = 1 GHz 0.5%

Center frequency = 2 GHz 0.5%

Center frequency = 3 GHz 0.7%

Center frequency = 5 GHz
(WCA280A only)

EVM ≤2.5%

EVM ≤2.5%

0.5%

1.2%

2.7%

0.5%

1.2%

2.7%

0.7%

1.5%

2.9%

0.7%

0.7%

1.5%

3.0%

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

WCA230A & WCA280A Service Manual

1- 9

Specifications

Table 1- 11: Digital demodulation (Cont.)

Characteristics Description

π/4 DQPSK EVM (Typical) Symbol rate

Center frequency = 1 GHz 0.6%

0.6%

1.2%

2.7%

Center frequency = 2 GHz 0.6%

0.6%

1.2%

2.7%

Center frequency = 3 GHz 0.7%

0.7%

1.5%

2.9%

Center frequency = 5 GHz
(WCA280A only)

16QAM EVM (Typical) Symbol rate

Center frequency = 1 GHz 0.9%

Center frequency = 2 GHz 0.9%

Center frequency = 3 GHz 0.9%

Center frequency = 5 GHz
(WCA280A only)

0.7%

0.7%

1.5%

3.0%

0.5%

1.2%

2.2%

0.5%

1.2%

2.2%

0.5%

1.2%

2.5%

0.9%

0.5%

1.2%

2.5%

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

100 kHz
1MHz
4MHz
10 MHz

Table 1- 12: Analog demodulation

Characteristics Description

Accuracy (Typical)

AM demodulation ±2% (--10 dBfs input at center, 10 to 60% modulation depth)

PM demodulation ±3° (--10 dBfs input at center)

FM demodulation ±1% of span (--10 dBfs input at center)

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WCA230A & WCA280A Service Manual

Table 1- 13: RBW (Resolution Bandwidth)

Characteristics Description

Filter shape Gaussian, Rectangle, Root Nyquist

Setting range 1Hzto10MHz

Minimum Resolution Bandwidth (S/A mode)

>2 GHz span 100 kHz

1to1.99GHzspan 50 kHz

500 to 990 MHz span 20 kHz

200 to 490 MHz span 10 kHz

100 to 190 MHz span 10 kHz

50 to 90 MHz span 10 kHz

20 to 40 MHz span 10 kHz

10 MHz span 1kHz

5 MHz span 1kHz

2 MHz span 1kHz

1 MHz span 1kHz

500 kHz span 500 Hz

200 kHz span 200 Hz

100 kHz span 100 Hz

50 kHz span 50 Hz

20 kHz span 20 Hz

10 kHz span 10 Hz

5 kHz span 5Hz

2 kHz span 2Hz

1 kHz span 1Hz

500 Hz span 1Hz

200 Hz span 1Hz

100 Hz span 1Hz

Specifications

WCA230A & WCA280A Service Manual

1- 11

Specifications

Table 1- 14: Trigger (S/N B020000 and above)

Characteristics Description

Trigger mode Free run, Triggered

Trigger event source Power (Span BW), Frequency mask (Option 02), External

Pre/Post trigger setting Trigger position can be set from 0 to 100% of total data length.

Power trigger 0to--40dBfs

Frequency mask trigger (Option 02)

Mask resolution 1bin

Level range 0to--60dBfs

Real-time event detection bandwidth Baseband: 20 MHz (1024 point FFT, 50% overlapping)

RF: 15 MHz (1024 point FFT, 50% overlapping)

External trigger

Threshold voltage --1.5 V to +1.5 V adjustable

Setting Resolution 0.1 V

Input impedance >2 kΩ

Trigger output voltage High: >2.0 V, Low: <0.4 V (output current <1 mA)

Trigger marker position timing uncertainty ±2 sample points (Power/External trigger)

Table 1- 15: Trigger (S/N below B020000 and J300100 and above)

Characteristics Description

Trigger mode Free run, Triggered

Trigger event source IF (Level comparator)

External (TTL)
IQ (Option 02, power comparator)

Internal trigger comparator data source A/D output (IF level trigger)

Frequency amplitude (Option 02)
Time amplitude (Option 02)

Pre/Post trigger setting Trigger position can be set from 0 to 100% of total data length.

IF level trigger setting range 1 to 100% (100% is full scale of A/D converter output)

Event trigger (Option 02)

Frequency domain

Mask resolution 1bin

Trigger level 0to--60dBfs

Real-time event detection bandwidth 5 MHz (1024 point FFT, 50% overlapping)

Time domain

Trigger level 0to--40dBfs

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WCA230A & WCA280A Service Manual

Specifications

Table 1- 15: Trigger (S/N below B020000 and J300100 and above) (Cont.)

Characteristics Description

External trigger input

Input voltage High: +1.6 to +5 V; Low: 0 to +0.5 V

Input impedance >2 kΩ

Trigger output High: >2.0 V, Low: <0.4 V (output current <1 mA)

Trigger marker position timing uncertainty ±2 sample points

Table 1- 16: Measurement function

Characteristics Description

S/A mode Noise power, Channel power, Adjacent channel power ratio, Occupied bandwidth,

Emission bandwidth, Carrier to Noise ratio, Carrier frequency, Spurious

Demod mode Analog demodulation (AM, FM, PM), Digital demodulation (refer to Table 1--11),

I/Q vs. Time, Power vs. Time, Frequency vs. Time

Time mode I/Q vs. Time, Power vs. Time, Frequency vs. Time, CCDF, Pulse measurement

Pulse measurement Pulse width, Pulse peak power, On/Off ratio, Pulse ripple, Pulse repetition interval,

Duty cycle, Pulse-Pulse phase, Channel power, OBW, EBW, Frequency deviation

Pulse length Minimum 20 samples; Maximum 260,000 samples

Table 1- 17: Display

Characteristics Description

View

Number of views 1, 2, 3, or 4

Number of display traces 2

LCD

Size 213 mm (8.4 in)

Resolution 800 × 600 pixels

Color Maximum 256 colors

Display detector Positive peak, Negative peak, and Positive-Negative peak

WCA230A & WCA280A Service Manual

1- 13

Specifications

Table 1- 18: Marker, trace, and display line

Characteristics Description

Marker type Normal, Reference, and Band power

Search function Peak right, Peak left, Maximum, Larger peak, and Smaller peak

Trace content Active, Average, Max Hold, Min Hold, View, and Off

Display line Horizontal line 1 and 2, Vertical line 1 and 2

Table 1- 19: Controller and interface

Characteristics Description

Controller

CPU Intel Pentium III 850 MHz

DRAM 256 MB DIMM

OS Windows XP

System bus PCI, ISA

Storage medium

Hard disk ≥20 GB 2.5 inch IDE

Floppy disk 1.44 MB 3.5 inch

Interface

Printer port USB

GPIB IEEE 488.1

LAN 10/100 BASE-T (IEEE 802.3)

Mouse USB

Keyboard USB

Monitor out VGA (D-SUB 15 pins)

1- 14

WCA230A & WCA280A Service Manual

Specifications

Table 1- 20: Power requirements

Characteristics Description

Rating voltage 100 to 240 VAC

Voltage range 90 to 250 VAC

Line frequency 47 to 63 Hz

Mains Fuse Data Densei--Lambda supplies: 5 A, Time--delayed, 250 V (not operator replaceable)

Cosel supply: 2 A, Time--delayed, 250 V (not operator replaceable)

Heat dissipation

Maximum power 350 VA

Maximum line current 5Armsat50Hz(90Vlinewith5%clipping)

Surge current Maximum 52 A peak (25 _C) for ≤5 line cycles after the product has been turned off

foratleast30s.

Table 1- 21: Power connector

Characteristics Description

Preamp power connector

Connector type LEMO 6 poles

Pin assignment Pin1:NC,Pin2:ID1,Pin3:ID2,Pin4: --12V,Pin5:GND,Pin6:+12V

WCA230A & WCA280A Service Manual

1- 15

Specifications

Physical Characteristics

Table 1- 22: Physical characteristics

Characteristics Description

Dimensions

Width 425 mm (16.7 in) without belts

Height 215 mm (8.5 in) without feet

Depth 425 mm (16.7 in) without cover and feet

Net weight 19 kg

Environmental Characteristics

Table 1- 23: Environmental characteristics

Characteristics Description

Temperature

Operating +10to+40_C

Nonoperating -- 2 0 t o + 6 0 _C

Relative humidity

Operating and nonoperating 20 to 80% (no condensation), maximum wet-bulb temperature 29 _C

Altitude

Operating Up to 3000 m (10000 ft)

Nonoperating Up to 12000 m (40000 ft)

Vibration

Operating 2.65 m/s2rms (0.27 G rms), 5 to 500 Hz

Nonoperating 22.3 m/s2rms (2.28 G rms), 5 to 500 Hz

Shock

Nonoperating 196 m/s2(20 G), half-sine, 11 ms duration

Three shocks in each direction along each major axis, total of 18 shocks

Cooling clearance

Bottom 20 mm (0.79 in)

Both sides 50 mm (1.97 in)

Rear 50 mm (1.97 in)

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WCA230A & WCA280A Service Manual

Specifications

Table 1- 24: Certifications and compliances

Characteristic Description

EC Declaration of Conformity -- EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance

was demonstrated to the following specifications as listed in the Official Journal of the
European Communities:

EN 61326 EMC requirements for Class A electrical equipment for

measurement, control and laboratory use.

1

IEC 61000-4-2 Electrostatic discharge immunity

(Performance criterion B)

IEC 61000-4-3 RF electromagnetic field immunity

(Performance criterion A)

IEC 61000-4-4 Electrical fast transient / burst immunity

(Performance criterion B)

IEC 61000-4-5 Power line surge immunity

(Performance criterion B)

IEC 61000-4-6 Conducted RF immunity

(Performance criterion A)

IEC 61000-4-11 Voltage dips and interruptions immunity

(Performance criterion B)

EN 61000-3-2 AC power line harmonic emissions
EN 61000-3-3 Power line voltage fluctuation/flicker

Australia/New Zealand Declaration of
Conformity -- EMC

Complies with EMC provision of Radiocommunications Act per the following
standard(s):

AS/NZS 2064.1/2 Industrial, Scientific, and Medical Equipment: 1992

EC Declaration of Conformity -- Low Voltage Compliance was demonstrated to the following specification as listed in the Official

Journal of the European Union:

Low Voltage Directive 73/23/EEC, amended by 93/68/EEC

EN 61010-1:2001 Safety requirements for electrical equipment for

measurement control and laboratory use.

U.S. Nationally Recognized Testing Laboratory

UL61010B-1 Standard for electrical measuring and test equipment.

Listing

Canadian Certification CAN/CSA C22.2 No. 1010.1 CSA safety requirements for electrical and electronic

measuring and test equipment.

Additional Compliance ANSI/ISA S82.02.01:1999 Safety standard for electrical and electronic test,

measuring, controlling, and related equipment.

IEC61010-1 Safety requirements for electrical equipment for

measurement, control, and laboratory use.

1

Emissions which exceed the levels required by this standard may occur when this equipment is connected to
a test object.

WCA230A & WCA280A Service Manual

1- 17

Specifications

Table 1- 24: Certifications and compliances (Cont.)

Characteristic Description

Overvoltage Category Description Terminals on this product may have different installation (overvoltage) category

designations. The installation categories are:

CAT III Distribution-level mains (usually permanently connected). Equipment at this

level is typically in a fixed industrial location.

CAT II Local-level mains (wall sockets). Equipment at this level includes

appliances, portable tools, and similar products. Equipment is usually
cord-connected.

CAT I Secondary (signal level) or battery operated circuits of electronic equipment.

Overvoltage Category Overvoltage Category II (as defined in IEC61010-1, Annex J)

Pollution Degree Description A measure of the contaminates that could occur in the environment around and within

a product. Typically the internal environment inside a product is considered to be the
same as the external. Products should be used only in the environment for which they
are rated.

Pollution Degree 1 No pollution or only dry, nonconductive pollution occurs.

Products in this category are generally encapsulated,
hermetically sealed, or located in clean rooms.

Pollution Degree 2 Normally only dry , nonconductive pollution occurs.

Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a
typical office/home environment. Temporary
condensation occurs only when the product is out of
service.

Pollution Degree 3 Conductive pollution, or dry, nonconductive pollution that

becomes conductive due to condensation. These are
sheltered locations where neither temperature nor
humidity is controlled. The area is protected from direct
sunshine, rain, or direct wind.

Pollution Degree 4 Pollution that generates persistent conductivity through

conductive dust, rain, or snow. Typical outdoor locations.

Pollution Degree Pollution Degree 2 (as defined in IEC61010-1). Note: Rated for indoor use only.

Safety Certification Compliance

Equipment Type Test and measuring

Safety Class Class 1 (as defined in IEC61010-1, Annex H) -- grounded product

Operating Temperature Range +5 to +40 _C

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WCA230A & WCA280A Service Manual

Operating Information

Operating Information

The operating information for this instrument is available in the WCA230A and
WCA280A User Manual (Tektronix part number 071-1253-xx) that shipped with

your product.

WCA230A & WCA280A Service Manual

2- 1

Operating Information

2- 2

WCA230A & WCA280A Service Manual

Theory of Operation

Theory of Operation

This section describes the electrical operation of the WCA230A and WCA280A
using the major circuit blocks or modules as shown in Figure 9--1.

RF Input Circuit

The RF input circuit block consists of a relay for signal switching (Input Relay),
Step Attenuator 1 and 2, Programmable Band-pass Filter (WCA280A only), and
a control circuit for these components. This block adjusts the level of input
signal as appropriate in accordance with reference level settings, and sends the
signal to the 1

Input Relay located just after the RF INPUT connector is for calibration signal
switching. It switches to pass the internal calibration signal when self gain-cal­ibration is selected. The step attenuator 1 that follows is the Programmable
Attenuator of 10 dB/step, and attenuates the input signal up to --50 dB.

Band Relay performs switching of the signal paths between RF1 band and RF2/3
band. In baseband and RF1 band, fine adjustment to the level of input signal i s
done with S t ep Attenuator 2 to take full advantage of high dynamic range
characteristics of WCA230A/WCA280A. Step Attenuator 2 is the Programmable
Fine Attenuator of 2 dB/step and attenuates the signal up to --8 dB.

st

converter.

In RF2/3 band, bandwidth of the signal is limited with a Programmable
Band-pass Filter to avoid occurrence of images and/or spurious signals. This
Programmable B PF is able to adjust its center frequency in the range of 3.5 GHz
to 8 GHz, and adjustment to the center frequency is achieved with the current
output from the A100 Interconnection board. In a same way, other attenuators
and relays are controlled with currents from the A100 Interconnection board.

On the A100 Interconnection board, various components are installed, such as: a
group of registers to save the setup data from Hardware Controller, driver
circuits for relays and attenuators, D/A converter circuit for generation of tuning
current to Programmable BPF, ALC circuit to maintain the amplitude of the
calibration signal at a constant level, and other components.

WCA230A & WCA280A Service Manual

3- 1

Theory of Operation

Down Converter

RF3 Module

RF2 Module

The RF3 module contains the 1stConverter, 1stLocal Oscillator, 1stIF Amplifi­er, and other components. After level adjustment in the RF input circuit, the

st

input signal is applied to the 1
signal is frequency-converted into 1
frequency of 1
in this case, so that 1

st

the 1

IF signal passes through the 1stIF Amplifier that has a gain of approxi-

st

Local Oscillator is controlled with a synthesizer (RF4 module)

st

IF signal is always maintained at 4232 MHz. After this,

mately 10 dB, and is sent to the 2

In baseband, an input signal enters t he 1

Converter. Mixed with 1stLO signal, the input

st

IF signal of 4232 MHz. Oscillation

nd

Converter (RF2 module).

st

Converter. Then the signal path is
switched with a relay and t he signal is sent directly to the A10 A/D board for
A/D conversion. In RF1 band, an input signal goes through all converters (1

nd

2

, and 3rd). In RF2/3 band, an input signal is directly frequency-converted by

st

the 1

Converter into the 2ndIF signal of 422 MHz, then sent directly to 3

st

,

rd

Converter, bypassing the 2ndConverter.

The RF2 module consists of the 2
Oscillator. The 1

st

IF signal sent from the 1stConverter passes through a

nd

Converter, 3rdConverter, and 2ndLocal

Band-pass Filter and a Low-pass Filter for removal of unnecessary frequency
bands. After this, the 1

st

the 1
the 2
frequency of 2

IF signal is mixed with the 2ndLO signal and frequency-converted into

nd

IF signal of 422 MHz. Same with the case of 1stLocal Oscillator,

nd

st

IF signal enters the 2ndConverter. In the 2ndConverter,

Local Oscillator is controlled with a synthesizer circuit (RF4

module) to stabilize LO output frequency.

3- 2

RF5 Module

nd

The 2
mixed with the 3

IF signal is sent to the 3rdConverter. In the 3rdConverter, the signal is

rd

LO signal and frequency-converted into the 3rdIF signal of
39 MHz. After selected with a band-switching relay located at the input section
of the 3
RF2/3 band mode is also frequency-converted into the 3

The RF5 module consists of the 3
Reference Oscillator. The Oscillator block contains the 3

rd

Converter, the 2ndIF signal directly sent from the 1stConverter in

rd

IF Gain block, Oscillator block, and 10 MHz

rd

IF signal of 39 MHz.

rd

Local Oscillator and

an oscillator of Sampling Clock signal to be supplied to A/D Converter.

The Gain block consists of a Step Amplifier of 10 dB/step with the maximum
gain of 50 dB and a Step Attenuator with the maximum attenuation of --30 dB.
This block maintains the 3

rd

IF signal t o be sent t o A/D Converter at an

appropriate level, and adjusts the accuracy of conversion gain.

rd

Both the 3

LO signal and A/D clock signal generated in the Oscillator block are
highly stabilized signals locked with a 10 MHz reference signal, and are output
to the 3

rd

Converter and A10 A/D board, respectively.

WCA230A & WCA280A Service Manual

Theory of Operation

The 10 MHz Reference Oscillator is configured around an OCXO (Oven
Controlled Crystal Oscillator) with extremely high frequency stability. It is used
as the reference clock source for all the oscillators including the frequency
synthesizer circuits.

Circuits such as the input circuit of external 10 MHz reference signal, internal/
external reference switching circuit, and 10 MHz reference output circuit are also
contained in the RF5 module.

RF4 Module

The RF4 module is comprised of synthesizer circuits. The synthesizer consists of
multiple PLL Oscillator units of low noise type locked with the 10 MHz
reference signal. By changing the oscillation frequency of these PLL Oscillator
in fine steps, 1
while maintaining a good level of C/N.

The synthesizer also contains a circuit for generation of a 50 MHz signal to be
used as the reference for the calibration signal, PLL circuitry of the 2
Oscillator, a circuit for generation of DDS signal to be used as the reference
signal for the 3

Digital Signal Processing

A10 A/D Board

Analog signals such as the IF signal sent from the Down Converter block are
converted into digital format with a high-speed, high-accuracy A/D converter,
and sent to the A20 DDC board via the A50 Mother board.

The A/D board contains input circuits for three analog signals: IF signal,
baseband signal, and external IQ signal (optional). Each input circuit is equipped
with a Buffer Amplifier, a Step Amplifier, and a Step Attenuator to maintain the
signal level as appropriate, as well as a BPF or LPF for removal of signal
components within unnecessary frequency bands.

st

LO frequency can be tuned in the range of 4 GHz to 8 GHz

nd

rd

Local Oscillator, and other components.

Local

A40 DIFP Board

S/N B020000 and above

WCA230A & WCA280A Service Manual

The A40 DIFP (Digital IF Processor) board consists of an IQ Splitter, Digital
Filters, Trigger Detector, and Acquisition Memory. After being converted into
digital format in the A10 A/D board, the input signal is split into I and Q signals
by the IQ Splitter. At the same time, I/Q signals are frequency-shifted so that
each of them occupies a frequency band centered at frequency zero point (DC).
I/Q signals output from IQ Splitter are sent to the Digital F ilters. In these filters,
bandwidth of these signals is limited corresponding with span settings. In
addition, re-sampling is performed to achieve the higher frequency resolution.
I/Q signals output from the Digital Filters are sent to the Trigger Detector and
Acquisition Memory.

3- 3

Theory of Operation

The Trigger Detector achieves real-time frequency trigger function. When the
Frequency Mask Trigger function is activated, window function operation is
executed to the input signal first. To accelerate the operation, data are divided
into two groups: the odd frame data and the even frame data. With pipeline-con­nected FFT processors, real-time FFT is applied to these groups of data. After
being converted into frequency domain, the data are further converted into the
power domain with a pipeline-connected quadrature-to-polar coordinates
converter. After comparison with the reference data, the trigger board outputs the
trigger detect signal. When the Power Trigger function is activated, window
function operation and FFT operation mentioned above are bypassed. The data of
the time domain are converted into the power domain and sent to Trigger
Comparator.

The Acquisition Memory saves time domain data separated into I and Q signals.
The A40 DIFP board also interfaces between the data block and Windows
system. I/Q data output from the digital filter is saved to the dual port SRAM,
and then transferred to SDRAM as a block of data. The memory block of
SDRAM is also connected to the PCI local bus via a different dual port SRAM.
This allows the Windows system to refer to the contents copied to this dual port
SRAM as the data on the PCI memory space. The TRIG IN and OUT connectors
located on the rear panel are connected with this board. An external trigger signal
input is used, in addition, as the timing reference signal for the address control­ler. The A40 board also contains a microprocessor that controls various software
settings and various types of hardware as well as peripheral devices such as
ROM/RAM.

A20 DDC Board

S/N below B020000 and

J300100 and above

The DDC board consists of an IQ Splitter and cascade-connected Digital Filters.
After being converted into digital format in t he A10 A/D board, the input signal
is split into I and Q signals by the IQ Splitter. At the same time, I/Q signals are
frequency-shifted so that each of them occupies a frequency band centered at
frequency zero point (DC). I/Q signals output from IQ Splitter are sent to the
Digital Filters. In these filters, bandwidth of these signals is limited correspond­ing with span settings. In addition, resampling is performed to achieve the higher
frequency resolution. I/Q signals output from the Digital Filters are sent to the
A30 Trigger board (optional) and the A40 Memory board.

In the A20 DDC board, the IF Level Trigger signal is generated based upon the
data output from the A/D converter. The trigger signal is sent to the A40
Memory board that stops data acquisition at the timing corresponding with
trigger position.

3- 4

WCA230A & WCA280A Service Manual

Theory of Operation

A30 Trigger Board

(Optional)

S/N below B020000 and

J300100 and above

A40MemoryBoard

S/N below B020000 and

J300100 and above

The A30 Trigger board is an optional circuit board to achieve real-time frequen­cy trigger function. The board consists of a dual port SRAM and a pipeline-con­nected operational processor.

When the Frequency Mask Trigger function is activated, window function
operation is executed to the input signal first. To accelerate the operation, data
are divided into two groups: the odd frame data and the even frame data. With
pipeline-connected FFT processors, real-time FF T is applied to these groups of
data. After being converted into frequency domain, the data are further converted
into the power domain with a pipeline-connected quadrature-to-polar coordinates
converter. After comparison with the reference data, the trigger board outputs the
trigger detect signal. When the Power Trigger function is activated, window
function operation and FFT operation mentioned above are bypassed. The data of
the time domain are converted into the power domain and sent to Trigger
Comparator.

The A40 Memory board saves time domain data separated into I and Q signals
by the A20 DDC board. The A40 Memory board also interfaces between the data
block and Windows system.

I/Q data output from the A20 DDC board is saved to the dual port SRAM, and
then transferred to SDRAM as a block of data. The memory block of SDRAM is
also connected to the PCI bus via a different dual port SRAM. This allows the
Windows system to refer to the contents copied to this dual port SRAM as the
data on the PCI memory space. The TRIG IN and OUT connectors located on
the rear panel are connected with this board. The trigger detect signal output
from the A20 or the A30 board is output to an external device after being
synchronized with the memory’s address controller on this board. An external
trigger signal input is used, in addition, as the timing reference signal for the
address controller.

This memory board also contains a microprocessor that controls various software
settings and various types of hardware as well as peripheral devices such as
ROM/RAM.

Power Supply

Power Supply 1 and 2

WCA230A & WCA280A Service Manual

The power supply circuit consists of two units of AC/DC Converter (Power
Supply 1 and 2) energized from AC power line, and A70 DC power board,
which regulates the output voltages of AC/DC converter units and distributes the
regulated outputs to each of the boards and fans.

Note that Power Supply 1 and 2 units have different output voltage specifica­tions. The Power Supply 1 output voltages are +5 V / +15 V / --15 V / +24 V; the
Power Supply 2 output voltages are +5 V / +12 V / --12 V / +3.3 V.

3- 5

Theory of Operation

A70 DC Power Board

Standby Power and

On/Standby Switch

A50 Mother Board

The A70 DC Power board is equipped with multiple DC/DC converters, and
based upon the output voltages supplied by the Power Supply 1 and 2 units,
power voltages other than above are generated on this board. On the A70 DC
Power board, LED indicators and test points are provided to facilitate checking
that all the power supply voltages are output normally.

Power Supply 3 is the standby power supply unit which continuously supplies
power to some areas of the CPU board and the 10 MHz Reference Oscillator
even if the P ower Switch on the main unit is turned off (standby mode). Unless
the Principal Power Switch (located on the rear panel) is turned off, Power
Supply 3 continues to output power voltages. Because of this, remove AC power
before opening the enclosure to service inside the unit.

The Standby P ower Supply always maintains the ACPI (power control) function
for the CPU board to be active. With this function, the CP U board recognizes the
On status of the On/Standby Switch even in the power-off condition and is able
to output the power-on signal to Power Supply 1 and 2 unit s. To enable accurate
high frequency measurements just after power-on, power is also supplied to the
10 MHz Oscillator (OCXO) from S tandby Power Supply unit.

The A50 Mother board distributes power to all boards/modules, as well as
interfacing of control signals and data with the CPU. Other devices such as the
PCI Bridge, Local Bus Controller, and Bus Buffer for CPU bus expansion are
also on the A50 Mother board.

External Interface

A60 Front Key Board

A62 Front Connection

Board

3- 6

A microprocessor for key control is installed on the A60 Front Key board.
Various processes such as serial conversion of key scan, key code, and signal
transmission to the C PU board are performed on this board.

The A62 Front Connection board interfaces with peripheral devices such as
HDD, FDD, LCD, USB, and keys with the CPU board.

The GPIB controller is also installed on the Front Connection board, and its
output bus is connected to the GPIB connector located on the real panel through
the A50 Mother board and the A70 DC Power board.

WCA230A & WCA280A Service Manual

Performance Verification

Performance Verification

Two types of Performance V erification procedures can be performed on this
product; Brief Procedures and Performance Tests. You may not need to perform
all of these procedures, depending on what you want to accomplish.

H To rapidly confirm that the analyzer functions properly and was adjusted

properly, do the brief procedures under Functional Tests and Diagnostics,
which begin on page 4--3.

Advantages: These procedures are quick to do, require no external
equipment or signal sources, and perform functional and accuracy testing to
provide high confidence that the analyzer will perform properly. They can be
used as a quick check before making a series of important measurements.

H If more extensive confirmation of performance is desired, do the Perfor-

mance Tests, beginning on page 4--9, after doing the Functional Tests and
Diagnostics just referenced.

Advantages: These procedures add direct checking of warranted specifica­tions.

Disadvantages: They require more time to perform and suitable test
equipment is required. (Refer to Equipment Required on page 4--10.)

WCA230A & WCA280A Service Manual

4- 1

Performance Verification

Conventions

Throughout these procedures the following conventions apply:

H Each test procedure uses t he following general format:

Title of Test

Equipment Required

Prerequisites

Procedure

H Each procedure consists of as many steps, substeps, and subparts as required

to do the test. Steps, substeps, and subparts are sequenced as follows:

1. First Step

a. First Substep

H First Subpart

H Second Subpart

b. Second Substep

2. Second Step

H Instructions for menu selection follow this format:

FRONTPANELKEY> Side Menu Key > Submenu Key.
For example, “Press MODE: DEMOD > Digital Demod > Constellation”.
“MODE: DEMOD” indicates the DEMOD key in the MODE menu area on
the front panel.

H In steps and substeps, the lead-in statement in italics instructs you what to

do, while the instructions that follow t ell you how to do it.
In the example step below, “Set the WCA280A analyzer controls” by doing
“Press MODE: DEMOD > Digital Demod > Constellation”.

Set the WCA280A analyzer controls:

Press MODE: DEMOD > Digital Demod > Constellation.

STOP. The symbol at the left is accompanied by information you must read to do
the procedure properly.

4- 2

WCA230A & WCA280A Service Manual

Brief Procedures

The Functional Tests use the internal calibration signal as a test-signal source for
further verifying that the analyzer functions properly.

The Diagnostics use internal routines to verify that the instrument functions
properly and passes the internal circuit tests.

The Functional Tests begin on page 4--4 and the Diagnostics procedures are on
page 4--8.

WCA230A & WCA280A Service Manual

4- 3

Brief Procedures

Functional Tests

The analyzer has a built-in calibration signal source with amplitude of approxi­mately --20 dBm and frequency of 50 MHz. Using this source, perform this
quick functional check to verify that your instrument is operating correctly.

Equipment
Required

Prerequisites Power on the analyzer and allow a 20 minute warm-up before doing

1. Initialize the analyzer:

a. Press the SYSTEM key on the front panel.

b. Press the Reset All to Factory Defaults side key.

2. Check the system version and options:

a. Press the SYSTEM key on the front panel.

b. Press the Versions and Installed Options... side key.

c. Check the version at the “Main System” field and the options in the

option table.

3. Check the display brightness:

a. Press the Cancel-Back (top) side key.

b. Press the Display Brightness side key.

None

this procedure.

4- 4

c. Change the value from 0 to 100% using the general purpose knob to

check that the brightness changes normally.

4. Display spectrum of the calibration signal:

a. Press S/A > Spectrum Analyzer.

b. Press the PRESET key on the front panel to reset the analyzer.

c. Press INPUT > Signal Input Port... > Cal.

The spectrum of the calibration signal appears.

d. Check that “INPUT: CAL” and “FREE RUN” are displayed in the status

indicator at the upper right of the screen (see Figure 4-- 1).

WCA230A & WCA280A Service Manual

Status indicator

Brief Procedures

Marker readout

Marker

Figure 4- 1: Spectrum of the calibration signal (50 MHz, - 20 dBm)

5. Check the center frequency and peak amplitude using the marker:

a. Press the PEAK key on the front panel to place the marker on the peak

(see Figure 4--1).

b. Check the marker readouts on screen. The frequency should be 50 MHz

c. Press MARKER SETUP > Markers > Off.

6. Check the RBW (Resolution Bandwidth) while changing the span setting.

a. Press the SPAN key on the front panel.

b. Confirm that the span is 15 MHz and the RBW is 80 kHz in the setup

WCA230A & WCA280A Service Manual

and the amplitude should be approximately --20 dBm.

Check that the marker disappears.

display on the upper part of the screen (see Figure 4--2).

4- 5

Brief Procedures

Setup display

Span

RBW

Span setting

Figure 4- 2: Setup display

c. Using the general purpose knob, change the span setting as listed in

Table 4--1 and check that the RBW is displayed correctly.

Table 4- 1: Span and RBW

Span RBW

15 MHz 80 kHz

5MHz 20 kHz

100 kHz 500 Hz

1kHz 20 Hz

d. Using the numeric keypad, set the span back to 15 MHz.

(Press 1 > 5 > MHz, in that order, on the keypad.)

7. Check the reference level:

a. Press the AMPLITUDE key on the front panel.

b. Make sure that the reference level is set to 0 dBm with the Ref Level

side key. Check that 0 dBm is displayed on the upper left side of the
graticule (see Figure 4--3).

c. Use the general purpose knob to set the reference level to --30 dBm.

d. Confirm that A/D OVERFLOW is indicated in the red box at the top

center of the screen. Make sure that --30 dBm is displayed on the upper
left side of the graticule and that the spectrum waveform is distorted as
shown in Figure 4--3.

e. Using t he numeric keypad, set the reference level back to 0 dBm.

(Press 0 > ENTER, in that order, on the keypad.)

4- 6

WCA230A & WCA280A Service Manual

Reference level

Brief Procedures

A/D overflow indicator Reference level setting

Figure 4- 3: Reference level setting and A/D overflow indicator

Spectrogram

8. Check the spectrogram display:

a. Press S/A > S/A with Spectrogram. Check that the spectrogram is

displayed on the lower side of the screen (see Figure 4 --4).

Figure 4- 4: Spectrogram display

b. Press the RUN/STOP key on the front panel to stop data acquisition.

WCA230A & WCA280A Service Manual

Confirm that the trace display freezes and P AUSE is displayed in the
status indicator at the top right of the screen.

4- 7

Brief Procedures

Diagnostics

You can run the internal diagnostic program to check hardware states.
Table 4--2 shows the test items and their descriptions.

Table 4- 2: Internal diagnostic program

Menu item Description Possible failure

Temp Sensor Checks that the temperature sensor works correctly. RF5 module

Data Memory Checks that the acquisition memory works correctly. A40 board

The process is

graphically displayed

on the upper views.

Equipment
Required

Prerequisites Power on the analyzer and allow a 20 minute warm-up before doing

None

this procedure.

1. Press CAL > Service... > Password.

2. Enter 270833 andthenpresstheENTER key using the numeric keypad.

3. Press the DIAG side key.

4. Select the diagnostic menu item to be executed.

You may press the All side key to run all the tests.

5. Check the result shown in the lower left view with “Pass” or “Fail”.

4- 8

Figure 4- 5: Diagnostic screen

WCA230A & WCA280A Service Manual

Performance Tests

This section contains a collection of procedures for checking that the WCA230A
and WCA280A Portable Wireless Communication Analyzers perform as
warranted.

STOP. These procedures extend the confidence level provided by the basic
procedures described on page 4--3. Perform the basic procedures first and then
perform the following procedures if desired.

There are two types of performance tests: Auto Tests and Manual Tests.

H Auto Tests use internal routines to verify that the analyzer functions properly

H Manual Tests supplement the Auto Tests to verify the analyzer performance

and was adjusted properly.

formally and report the test records.

WCA230A & WCA280A Service Manual

4- 9

Performance Tests

Prerequisites

The tests in this section comprise an extensive, valid confirmation of perfor­mance and functionality when the following requirements are met:

H The cabinet must be installed on the analyzer.

H The instrument must have passed the procedures under Brief Procedures

found on page 4--3.

H A signal-path compensation must have been done within the recommended

calibration interval and at a temperature within ±3 _C of the present
operating temperature. (If at the time you did the prerequisite Brief Proce-
dures, the temperature was within the limits just stated, consider this
prerequisite met.)

H The analyzer must have been last adjusted at an ambient temperature

between +20 _C and +30 _C, must have been operating for a warm-up
period of at least 20 minutes, and must be operating at an ambient tempera­ture of between +10 _C and +40 _C. (The warm-up requirement is usually
met in t he course of meeting the Brief Procedures prerequisites.)

H The SG flatness/spurious floppy disk(s) (Item 17 in Table 4--3) must be

prepared. For the procedure to create or update the flatness and spurious
correction files, refer to Making Flatness Correction Files on page 5--6 and
Making Spurious Correction Files on page 5--13.

Equipment Required

These procedures use external, traceable signal sources to directly check
warranted characteristics. Table 4--3 shows the required equipment.

Table 4- 3: Test equipment

Item number and
description

1. Signal generator

2. Signal generator Frequency range: 10 MHz to 8 GHz;

3. Signal generator Frequency range: 1 MHz to 8 GHz;

1

For WCA230A, you can use the signal generator with the frequency range of 10 kHz to 3 GHz, for example Agilent 8648C.

1

Minimum requirements Example Purpose

Frequency range : 10 kHz to 3.5 GHz;
V ariable amplitude from --70 dBm to
+13 dBm into 50 Ω;
Accuracy: <±1 dB; Function: FM

Output level: --30 dBm to +10 dBm;
Accuracy: <±1dB

Output level: --30 dBm to +10 dBm;
Accuracy: <±1dB

Agilent 8648D Checking flatness in base-

band and RF1 band

Agilent 83712B with
option 1E1

Agilent E8257D with
option 1E1
(option UNX recommended)

Checking flatness in RF2 and
RF3 bands (WCA280A only)

Checking flatness in all bands

4- 10

WCA230A & WCA280A Service Manual

Table 4- 3: Test equipment (Cont.)

Item number and
description

Performance Tests

PurposeExampleMinimum requirements

4. Signal generator Frequency: 2 GHz; Output:
≥--10 dBm; Digital modulation: QPSK;
Symbol rate: 4.096 M/s

5. Frequency counter Frequency range: 10 MHz;
Aging rate: <5×10
Accuracy: <0.01 ppm at 10 MHz

6. RF power meter 1MHzto8GHz Agilent E4418B Adjusting the signal generator

7. RF power sensor 10 MHz to 8 GHz; RF Flatness: <3%;
Uncertainty of calibration factor data:
<2% (RSS)

8. Power combiner Range: 500 MHz to 2 GHz; Isolation:
>18 dB; Insertion loss: <1.0 dB

9. BNC cable 50 Ω, 36 in, male-to-male BNC
connectors

10. N-N cable 50 Ω, 36 in, male-to-male N
connectors

11. N-SMA cable

(Three required)

12. GPIB cable

(Two required for
WCA280A)

13. Terminator Impedance: 50 Ω; connectors: female

14. RF attenuator Ratio: 10 dB; impedance 50 Ω;

15. Mouse USB Standard accessary File operation

16. Keyboard USB Standard accessary File operation

17. SG flatness/spurious

floppy disk (for each
signal generator used)

50 Ω, 36 in, male N-to-male SMA
connectors

2m, double-shielded Tektronix part number

BNC input, male BNC output

Bandwidth: >8 GHz

Created or updated with the
procedures described on pages 5--6
and 5--13

-- 1 0

/day;

Rohde & Schwarz SMIQ03B Checking intermodulation

distortion

Agilent 53132A with
option 010

Agilent E4412A Adjusting the signal generator

Mini-Circuits ZAPD-21 Checking intermodulation

Tektronix part number
012-1341-00

012-0991-00

Tektronix part number
011-0049-01

Inmet 18N--10
Mini-Circuits BW--S10W2

3.5 inch, 720 K or 1.44 MB,
DOS-compatible floppy disk

Checking the reference out­put frequency accuracy

output level

output level

distortion

Signal interconnection

Signal interconnection

Signal interconnection

Software-based tests

Signal termination for check­ing frequency accuracy

Checking flatness

Storing flatness and spurious
correction data for the signal
generators (Items 1, 2, and 3)

WCA230A & WCA280A Service Manual

4- 11

Performance Tests

Auto Tests

The auto tests use internal routines to verify specifications for the following
characteristics:

H Baseband flatness

H IF flatness

H RF flatness

H Spurious response

Use the following service PV menu and procedure to set parameters and perform
the tests.

Service PV Menu

Selects the PV (performance verification) test items and bands. Access this menu
by pressing CAL > Service... > Password (270833) > PV (see Figure 4-- 6).

WCA280A only

4- 12

Figure 4- 6: Auto test initial screen

The PV menu has the following controls:

PV Select. Selects the test items as shown in Table 4--4.

WCA230A & WCA280A Service Manual

Performance Tests

Table 4- 4: Test item selection

PV Select

Test item All Spurious Other

Baseband flatness ✓ ✓

IF flatness ✓ ✓

RF flatness ✓ ✓

Spurious response ✓ ✓

All Band. Performs the tests in all bands: Baseband, RF1, RF2, and RF3.
RF2 and RF3 are for WCA280A only.
Measurement bandwidth: 1 MHz to 3 GHz (WCA230A) / 8 GHz (WCA280A)

BB. Performs the tests in the baseband.
Measurement bandwidth: 1 MHz to 20 MHz

RF1. P erforms t he tests in the RF1 band.
Measurement bandwidth:

20 MHz to 3 GHz (WCA230A) / 3.5 GHz (WCA280A)

BB+RF1. P erforms the tests in the baseband and RF1 band.
Measurement bandwidth: 1 MHz to 3 GHz (WCA230A) / 3.5 GHz (WCA280A)

RF2+RF3. Performs the tests in the RF2 and RF3 band.
Measurement bandwidth: 3.5 GHz to 8 GHz

RF1+RF2+RF3. Performs the tests in the RF1, RF2, and RF3 band.
Measurement bandwidth: 20 MHz to 8 GHz

Config... Sets the signal generator manufacturer and the GPIB address.

H SG Type. Selects the manufacturer of the generator for the GPIB command

system: HP or Anritsu.

NOTE. The HP setting also supports Agilent and Rohde & Schwarz products.

H GPIB Add ress. Sets the GPIB address of the generator.

WCA230A & WCA280A Service Manual

4- 13

Performance Tests

STOP. Select either of these two procedures, depending on the signal genera­tor(s) you use:

H Procedure 1 below:

Uses one signal generator, Item 3, which covers all measurement bands:
Baseband, RF1, RF2, and RF3.

H Procedure 2 on page 4--16:

Uses two signal generators: Item 1, which covers the baseband and
RF1 band, and Item 2, which covers the RF2 and RF3 bands.

RF2 and RF3 are for WCA280A only.

Procedure 1

Performs the auto tests using one signal generator (Item 3), which covers all
measurement bands: Baseband, RF1, RF2, and RF3 (RF2 and RF3 are for
WCA280A only).

Equipment
Required

Prerequisites Refer to page 4--10

One signal generator (Item 3)

One 50 Ω N-N coaxial cable (Item 10)

One 10 dB attenuator (Item 14)

One GPIB cable (Item 12)

One SG flatness/spurious floppy disk (Item 17)

1. Prepare for the t est: See the figure below for the hookup.

WCA230A/WCA280A

Signal generator

GPIB cable

4- 14

Output

10 dB attenuator

50 Ω N-N coaxial cable

WCA230A & WCA280A Service Manual

Performance Tests

a. Power off the analyzer and the generator.

b. Connect the analyzer and the generator with a GPIB cable.

c. Connect the analyzer INPUT through a 10 dB attenuator followed by a

50 Ω N-N coaxial cable to the generator output.

d. Power on the analyzer and the generator.

e. Set the GPIB address of the generator, ranging from 1 to 30.

f. Insert the SG flatness/spurious floppy disk (Item 17) for the generator to

the floppy disk drive of the analyzer.

2. Perform the self calibration: Press CAL > Calibrate All.

3. Enter the PV menu:

a. Press Service... > Password in the CAL menu.

b. Enter 270833 andthenpressENTER using the numeric keypad.

c. Press the PV side key.

d. Set the GPIB address of the generator:

H Press the Config... side key.

H Press the SG Type side key to select the manufacturer of the

generator for the GPIB command system: HP or Anritsu.

H Press the SG Address side key and set the generator address.

H Press the Cancel--Back side key.

4. Perform the tests in all bands:

Press the All Band side key to perform the tests.

NOTE. You can select the test items and bands as described in Service PV Menu
on page 4--12.

5. Check the test results:

Check the Pass/Fail results displayed on the lower left of the screen
(see Figure 4--7).

If any tests fail, go to When the Auto Tests Fail on page 4--19.

WCA230A & WCA280A Service Manual

4- 15

Performance Tests

Procedure 2

Figure 4- 7: Auto test result display example

6. Disconnect the test equipment:

a. Disconnect the cable from the analyzer input.

b. Turn off the analyzer and generators.

c. Disconnect the GPIB cables from all the ports.

Performs the auto tests using two s ignal generators: Item 1, which covers
the baseband and RF1 band, and Item 2, which covers the RF2 and RF3 bands
(RF2 and RF3 are for WCA280A only).

Equipment
Required

Prerequisites Refer to page 4--10

Two signal generators (Items 1 and 2)

One 50 Ω N-N coaxial cable (Item 10)

One 10 dB attenuator (Item 14)

One GPIB cable (Item 12, two required)

One SG flatness/spurious floppy disk (Item 17, two required)

4- 16

WCA230A & WCA280A Service Manual

1. Prepare for the t est:

A

/WCA

A

Hook up the equipment as shown in the following figure.

Performance Tests

GPIB cable

WCA230

Signal generator (Item 1)Signal generator (Item 2)

GPIB cable

Output

50 Ω N-N coaxial cable

10 dB attenuator

280

a. Power off the analyzer and the signal generators.

b. Connect the analyzer and the generators with GPIB cables.

c. Connect the analyzer INPUT through a 10 dB attenuator followed by a

50 Ω N-N coaxial cable to the generator (Item 1) output.

d. Power on the analyzer and the generators.

e. Set the GPIB address of the generators, ranging from 1 to 30.

Assign a unique address to each instrument.

f. Insert the SG flatness floppy/spurious disk (Item 17) for the generator

(Item 2) to the floppy disk drive of the analyzer.

2. Perform the self calibration: Press CAL > Calibrate All.

3. Enter the PV menu:

a. Press Service... > Password in the CAL menu.

b. Enter 270833 andthenpressENTER using the numeric keypad.

c. Press the PV side key.

d. Set the GPIB address of the generator:

H Press the Config... side key.

H Press the SG Type side key to select the manufacturer of the

generator (Item 1) for the GPIB command system: HP or Anritsu.

H Press the SG Address side key and set the generator address.

H Press the Cancel--Back (top) side key.

WCA230A & WCA280A Service Manual

4- 17

Performance Tests

4. Perform the tests in the baseband and RF1 band:

Press the BB+RF1 side key to perform the tests.

5. Check the test results:

Check the pass/fail results displayed on the lower left of the screen
(see Figure 4--7 on page 4--16).

If any tests fail, go to When the Auto Tests Fail on page 4--19.

STOP. Steps 6 through 8 are the tests in the RF2 and RF3 bands for WCA280A
only. For WCA230A, skip to step 9.

6. Change the signal generator:

a. Disconnect the N--N cable from the signal generator (Item 1) output.

b. Connect the N--N cable to the signal generator (Item 2) output.

c. Set the GPIB address of t he generator:

H Press the Config... side key.

H Press the SG Type side key to select the manufacturer of the

generator (Item 2) for the GPIB command system: HP or Anritsu.

H Press the GPIB Address side key and set the generator address.

H Press the Cancel--Back (top) side key.

7. Perform the tests in the RF2 and RF3 bands:

Press the RF2+RF3 side key to perform the tests.

8. Check the test results:

Check the pass/fail results displayed on the lower left of the screen
(see Figure 4--7 on page 4--16).

If any tests fail, go to When the Auto Tests Fail on page 4--19.

9. Disconnect the test equipment:

a. Disconnect the N-N cable from the analyzer input.

b. Turn off the analyzer and generators.

c. Disconnect the GPIB cables from all the ports.

4- 18

WCA230A & WCA280A Service Manual

Performance Tests

When the Auto Tests Fail

If any test results in Fail (see Figure 4--7 on page 4--16), perform calibration,
referring to Auto Calibration on page 5--20, and then perform the auto tests
again.

1. Perform the auto calibration for the failed test item as shown in Table 4--5.

Table 4- 5: Procedure for failed test item

Failed test item Procedure

BB Flatness Perform the baseband flatness calibration.

Use the All Band Calibration on page 5--22, but select BB in
the service Cal menu.

IF Flatness, RF1
IF Flatness, RF2
IF Flatness, RF3

RF Flatness, RF1
RF Flatness, RF2
RF Flatness, RF3

Spurious, RF1
Spurious, RF2
Spurious, RF3

Perform the IF flatness calibration.
Refer to All Band Calibration on page 5--22 for the procedure.
You can select RF1, RF2+RF3,orRF1+RF2+RF3 with
Cal Select in the service Cal menu for the band in which the
error occurred.

Perform the RF flatness calibration.
Refer to All Band Calibration on page 5--22 for the procedure.
You can select RF1, RF2+RF3,orRF1+RF2+RF3 with
Cal Select in the service Cal menu for the band in which the
error occurred.

Perform the spurious calibration.
Use the All Band Calibration on page 5--22, but select
Spurious wit h Cal Select in the service Cal menu.
You can select RF1, RF2+RF3,orRF1+RF2+RF3 in the
service Cal menu for the band in which the error occurred.

2. Perform the auto tests again to check that the instrument passes.

If the instrument fails the spurious test again, go to the next section, Further
Spurious Test.

Further Spurious Test. Performs spurious test at the specified frequency.

1. Connect a USB mouse (Item 15) and keyboard (Item 16) to the USB ports
on the side panel of the analyzer.

2. Press MEASURE (front panel) > Spurious PV.

3. Set the GPIB address of the signal generator:

a. Press the SG side key to select the manufacturer of the generator for the

b. Press the GPIB Address side key and set the generator address.

WCA230A & WCA280A Service Manual

GPIB command system: HP or Anritsu.

4- 19

Performance Tests

4. Check the error log:

Vi ew the error log in the following location using the mouse and keyboard:

NOTE. For accessing Windows XP on the analyzer, refer to the WCA230A and
WCA280A User Manual.

H Directory: C:\Program Files\Tektronix\wca200a\log

H File: spurious_RFxP V. l og

(RFx = RF1, RF2, or RF3, depending on the test frequency)

Below is an example of the spurious_RF1PV.log file:

Spurious PV, RF1
Begin 2005/04/28 16:34:03
1000MHz: 67.5kHz, --73.065dB
2000MHz: 55.3kHz, --76.142dB
End 2005/04/28 17:02:05

Center frequency

Spurious offset frequency
from the center frequency

Difference in level between carrier
at the center frequency and
spurious at the offset frequency

5. Set test frequency:

a. Press the Band side key to select the band in which the error occurred.

For example, if an error occurred at 1000 MHz, select RF1.

b. Press the Start side key and set the frequency at which the error

occurred. For example, if an error occurred at 1000 MHz, enter 1000.

c. Press the Stop side key and set the same frequency as in Start (in this

example, 1000) to perform the measurement at the error frequency.

6. Perform the test: Press the Measurement side key to run the test.
Check that the test passes on the right bottom of the screen.

7. Repeat steps 5 and 6 for all the frequencies listed in the log file.

4- 20

WCA230A & WCA280A Service Manual

Manual Tests

The manual tests include the following items:

H 10 MHz reference output

H Absolute amplitude accuracy

H Input attenuator setting uncertainty

H Spectrum purity

rd

H 3

H Frequency readout accuracy

H Spurious response

H Displayed average noise level

H Residual response

order intermodulation distortion

Performance Tests

WCA230A & WCA280A Service Manual

4- 21

Performance Tests

10 MHz Reference Output

Test

Check that the output frequency from the REF OUT connector (on the rear
panel) is within the specified range for the analyzer.

Equipment
Required

Prerequisites Refer to page 4--10.

Frequency counter

CH1 input

50 Ω terminator

One frequency counter (Item 5)

One 50 Ω BNC coaxial cable (Item 9)

One 50 Ω terminator (Item 13)

The frequency counter must have been operating for a warm-up period
of at least 24 hours.

WCA230A/WCA280A (rear)

REF OUT

50 Ω BNC coaxial cable

Figure 4- 8: Initial test hookup

1. Prepare for the t est:

a. Hook up the frequency counter: Connect REF OUT on the rear panel of

the analyzer through a 50 Ω precision coaxial cable and a 50 Ω precision
terminator to Channel 1 of the counter. See Figure 4 -- 8.

b. Set the counter controls:

Function Frequency 1.................

Gate time 2 s................

2. Check the frequency: Check that the frequency counter reads
10 MHz 1.2 Hz.

3. Disconnect the hookup: Disconnect the cable at REF OUT.

4- 22

WCA230A & WCA280A Service Manual

Performance Tests

Absolute Amplitude

Accuracy Test

Check that the absolute amplitude error is within the specified range for the
analyzer. It uses a power meter and a power sensor to set the signal generator
output accurately.

Equipment
Required

Prerequisites Refer to page 4--10.

One signal generator (Item 1)

One power meter (Item 6)

One power sensor (Item 7)

One 50 Ω N-N coaxial cables (Item 10)

1. Set up the power meter and sensor:

NOTE. Store the power sensor correction factors in the power meter, if you have
not yet done so. When you use the Agilent 437B power meter, refer to Storing Cal
Factors in the Power Meter on page 5--4.

a. Connect the power meter and the power sensor. See Figure 4--9 below.

Power meter

Power sensor

Sensor input

Figure 4- 9: Initial hookup for setting up the power meter and sensor

b. Warm up the power meter and sensor for more than 20 minutes.

c. Press ZERO on the power meter.

d. Connect the RF input of the power sensor to the power reference output

of the power meter. See Figure 4--10 on page 4--24.

e. Turn on POWER REF and execute the calibration.

f. Disconnect the RF input of the power sensor from the reference output

of the power meter.

WCA230A & WCA280A Service Manual

4- 23

Performance Tests

Power meter

Power reference output

Figure 4- 10: Hookup for calibrating the power sensor

Baseband Test.

2. Set the signal generator output:

a. Hook up the instruments: Connect the signal generator (Item 1) output

through a 50 Ω N-N coaxial cable to the power sensor input. See
Figure 4--11.

Signal generator

Power meter

Output

Power sensor

Figure 4- 11: Hookup for setting the signal generator output

b. Set the signal generator controls:

Frequency 10 MHz................

Level --10 dBm....................

c. Set the power meter control:

Frequency 10 MHz................

d. Adjust the output level of the signal generator so that the power meter

reads --10 dBm 0.05 dBm.

4- 24

e. Disconnect the cable from the power sensor input.

WCA230A & WCA280A Service Manual

Performance Tests

3. Prepare for the t est:

a. Hook up the instruments: Connect the signal generator output through a

50 Ω N-N coaxial cable to the WCA230A/WCA280A INPUT.See
Figure 4--12.

WCA230A/WCA280A

Signal generator

Output

50 Ω N-N coaxial cable

Figure 4- 12: Hookup for checking the absolute amplitude accuracy

b. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

c. Modify the default settings:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 10 MHz using

the numeric keypad.

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 10 MHz using the general

purpose knob.

4. Check the amplitude:

a. Press the PEAK key on the front panel to place the marker on the

signal peak.

b. Check that the marker readout is within 10 dBm 0.3 dB.

5. Disconnect the hookup: Disconnect the cable at the analyzer input.

WCA230A & WCA280A Service Manual

4- 25

Performance Tests

RF (WCA230A) / RF1 (WCA280A) Band Test.

6. Modify the signal generator output:

a. Hook up the test equipment: Connect the signal generator output through

a50Ω N-N coaxial cable to the power sensor input. See Figure 4--11 on
page 4--24.

b. Modify the signal generator controls:

Frequency 50 MHz................

Level --20 dBm....................

c. Modify the power meter control:

Frequency 50 MHz................

d. Adjust the output level of the signal generator so that the power meter

reads --20 dBm 0.05 dBm.

e. Disconnect the cable from the power sensor input.

7. Modify the test hookup and preset the instrument controls:

a. Hook up the instruments: Connect the signal generator output through a

50 Ω N-N coaxial cable to the WCA230A/WCA280A INPUT.See
Figure 4--12 on page 4--25.

b. Calibrate the analyzer gain: Press CAL > Calibrate Gain.

c. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 50 MHz using

the numeric keypad.

H Press the AMPLITUDE key on the front panel.

H Press the RF Atten/Mixer side key to select RF Att.

H With the RF Att side key, set the attenuation to 0 dB.

8. Check the amplitude:

a. Press the PEAK key on the front panel to place the marker on the

signal peak.

4- 26

b. Check that the marker readout is within 20 dBm 0.5 dB.

9. Disconnect the test equipment: Disconnect the cable at the analyzer input.

WCA230A & WCA280A Service Manual

Performance Tests

Input Attenuator Setting

Uncertainty Test

Check the input attenuator setting error is within the specified range for the
analyzer.

Equipment
Required

Prerequisites Refer to page 4--10.

One signal generator (Item 1)

One 50 Ω N-N coaxial cables (Item 10)

1. Prepare for the t est:

a. Set the generator controls:

Frequency 50 MHz................

Amplitude --25 dBm................

RF output On................

b. Hook up the generator: Connect the generator output through a 50 Ω

N-N coaxial cable to the analyzer INPUT. See Figure 4--13.

WCA230A/WCA280A

Signal generator

Figure 4- 13: Initial test hookup

c. Initialize the analyzer:

WCA230A & WCA280A Service Manual

Output

50 Ω N-N coaxial cable

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

4- 27

Performance Tests

d. Modify the default settings:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 50 MHz using

the numeric keypad.

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 10 MHz using the general

purpose knob.

H Press the AMPLITUDE key on the front panel.

H With the Ref Level side key, set the reference level to --20 dBm

using the general purpose knob.

H Press the RF Atten/Mixer side key to select RF Att.

H With the RF Att side key, set the attenuation to 0 dB using the

numeric keypad or the general purpose knob.

2. Measure the reference amplitude at 0 dB attenuation:

a. Press the PEAK key on the front panel to place the marker on the

signal peak.

b. Record the peak amplitude at the marker readout as the reference value.

(Let the value be P

)

0.

3. Check the amplitude for the attenuation from 2 to 30 dB:

a. Press AMPLITUDE > RF Att and set the attenuation (initially 2 dB).

b. Press the PEAK key on t he front panel to place the marker on the

signal peak.

c. Record the peak amplitude at the m arker readout. (Let the value be P

d. Check that the error (P

-- P0) is within 0.5 dB.

X

e. Repeat substeps 3a through d for attenuation from 2 to 30 dB in 2 dB

steps.

4. Modify the generator controls:

Amplitude --5 dBm................

.)

X

4- 28

WCA230A & WCA280A Service Manual

Performance Tests

5. Modify the analyzer controls:

a. Press the AMPLITUDE key on the front panel.

b. With the Ref Level side key, set the reference level to 0 dB m using the

general purpose knob.

c. Make sure that RF Att is set to 30 dB.

6. Measure the reference amplitude at 30 dB attenuation:

a. Press the PEAK key on the front panel to place the marker on the

signal peak.

b. Record the peak amplitude at the marker readout as the reference value.

(Let the value be P

)

1.

7. Check the amplitude for attenuation from 32 to 50 dB:

a. Press AMPLITUDE > RF Att and set the attenuation (initially 32 dB).

b. Press the PEAK key on t he front panel to place the marker on the

signal peak.

c. Record the peak amplitude at the m arker readout. (Let the value be P

d. Check that the error (P

-- P1) is within 0.5 dB.

X

e. Repeat substeps 7a through d forattenuationfrom32to50dBin2dB

steps.

8. Disconnect the test equipment: Disconnect the cable at the analyzer input.

.)

X

WCA230A & WCA280A Service Manual

4- 29

Performance Tests

Spectrum Purity Test

Check that the spectrum purity is within the specified range for the analyzer.

Equipment
Required

Prerequisites Refer to page 4--10.

Signal generator

One signal generator (Item 4)

One 50 Ω N-N coaxial cable (Item 10)

WCA230A/WCA280A

Output

50 Ω N --N coaxial cable

Figure 4- 14: Initial test hookup

1. Prepare for the t est:

a. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

b. Modify the default settings:

H Press the AMPLITUDE key on the front panel.

H Press the RF Atten/Mixer side key to select Mixer.

H With the Mixer Level side key, set the level to --15 dBm.

H Press the TRACE/AVG key.

H Press the side key Trace 1 Type... > Average.

H Press the Number Of Averages side key and set the value to 50

using the general purpose knob.

4- 30

WCA230A & WCA280A Service Manual

Performance Tests

c. Set the generator controls:

Frequency 1500 MHz................

Amplitude --5 dBm................

RF output On................

d. Hook up the signal generator: Connect the generator output through a

50 Ω N-N coaxial cable to the analyzer INPUT. See Figure 4--14.

2. Check phase noise for a span of 100 kHz:

a. Modify the analyzer controls:

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 100 kHz using the general

purpose knob or the numeric keypad.

H Press the RBW/FFT key on the front panel.

H Press the RBW/FFT side key to select Man.

H With the RBW side key, set the RBW to 200 Hz.

b. Perform t he C/N (Carrier-to-Noise ratio) measurement:

H Press the MEASURE > C/N > MEAS SETUP key.

H Press the Offset Frequency side key and set the value to 10 kHz

using the general purpose knob.

H Press the Noise Bandwidth side key and set the value to 2 kHz

using the general purpose knob.

c. Check against limits: Read the phase noise (C/No) at the bottom of the

screen. Confirm that the value is 100 dB/Hz or more.

3. Check phase noise for a span of 1 MHz:

a. Modify the analyzer controls:

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 1 MHz using the general

purpose knob or the numeric keypad.

H Press the RBW/FFT key on the front panel.

WCA230A & WCA280A Service Manual

H Press the RBW/FFT side key to select Man.

H With the RBW side key, set the RBW to 2 kHz.

4- 31

Performance Tests

b. Perform the C/N measurement:

H Select MEASURE > C/N > MEAS SETUP.

H Press the Offset Frequency side key and set the value to 100 kHz

using the general purpose knob.

H Press the Noise Bandwidth side key and set the value to 20 kHz

using the general purpose knob.

c. Check against limits: Read the phase noise (C/No) at the bottom of the

screen. Confirm that the value is 105 dB/Hz or more.

4. Check phase noise for a span of 5 MHz:

a. Modify the analyzer controls:

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 5 MHz using the general

purpose knob or the numeric keypad.

H Press the RBW/FFT key on the front panel.

H Press the RBW/FFT side key to select Man.

H Press the Extended Resolution side key to select On.

H With the RBW side key, set the RBW to 5 kHz.

b. Perform the C/N measurement:

H Select MEASURE > C/N > MEAS SETUP.

H Press the Offset Frequency side key and set the value to 1 MHz

using the general purpose knob.

H Press the Noise Bandwidth side key and set the value to 200 kHz

using the general purpose knob.

c. Check against limits: Read the phase noise (C/No) at the bottom of the

screen. Confirm that the value is 125 dB/Hz or more.

5. Disconnect the test equipment: Disconnect the cable at the analyzer input.

4- 32

WCA230A & WCA280A Service Manual

3rdOrder Intermodulation

Distortion Test

Check that the 3
for the analyzer .

Performance Tests

rd

order intermodulation distortion is within the specified range

Equipment
Required

Prerequisites Refer to page 4--10.

Two signal generators (Items 2 and 4)

One power combiner (Item 8)

Three 50 Ω N-SMA coaxial cables (Item 11)

1. Prepare for the t est:

a. Connect each generator output through a 50 Ω N-SMA coaxial cable to

each power combiner input. See the figure below.

WCA230A/WCA280A

Signal generator

Output

N-SMA cable

Signal generator

Power

combiner

N-SMA cable

Output

b. Connect the power combiner output through a 50 Ω N-SMA coaxial

cable to the analyzer INPUT.

c. Set the signal generator (Item 2) controls:

Frequency 1999.85 MHz................

Level 0 dBm....................

ALC BW 100 Hz................

d. Set the signal generator (Item 4) controls:

Frequency 2000.15 MHz................

Level 0 dBm....................

ALC BW 100 Hz................

WCA230A & WCA280A Service Manual

4- 33

Performance Tests

e. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

f. Modify the default controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 2 GHz using the

numeric keypad.

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 1 MHz using the general

purpose knob.

H Press the AMPLITUDE key on the front panel.

H With the Ref Level side, and set the level to 5 dBm using the

general purpose knob.

H Press the RF Atten/Mixer side key to select Rf Att.

H With the RF Att side key, set the attenuation to 15 dB using the

general purpose knob.

H Press the RBW/FFT key on the front panel.

H Press the RBW/FFT side key to select Man.

H Press the Extended Resolution side key to select On.

H Press the RBW side key, set the RBW to 2 kHz.

g. Modify the generator output level:

H Press MARKERS: A or " to place the marker on the signal of

1999.85 MHz.

H Adjust the generator (Item 2) output level so that the signal level is

--10 dBm.

H Press MARKERS: A or " to place the marker on the signal of

2000.15 MHz.

H Adjust the generator (Item 4) output level so that the signal level is

--10 dBm.

4- 34

WCA230A & WCA280A Service Manual

2. Check the amplitude:

a. Modify the analyzer controls:

H Press TRACE/AVG > Trace 1 Type... > Average.

H Press the Number Of Averages side key and set the value to 50

using the general purpose knob.

H Press the MARKER SETUP key.

H Press the Markers side key to select Delta.

b. Measure the amplitude for the signals of 1999.55 MHz and

2000.45 MHz:

H Press the Select Marker side key to select 1.

H Place the first marker at the signal of 1999.55 MHz using the

MARKERS: A or " key.

Performance Tests

H Press the Select Marker side key to select 2.

H Place the second marker at the signal of 2000.45 MHz using the

MARKERS: A or " key.

c. Check against limits: Read the first and the second marker readouts.

Confirm that the larger value meets the requirement of --74 dBc.

3. Disconnect the test equipment: Disconnect the cable at the analyzer input.

WCA230A & WCA280A Service Manual

4- 35

Performance Tests

Frequency Readout Test

Check that the frequency readout accuracy is within the specified range for the
analyzer at 10 MHz, 2 GHz, 5 GHz, and 7 GHz.

Equipment
Required

Prerequisites Refer to page 4--10.

Signal generator

One signal generator (Item 2)

One 50 Ω N-N coaxial cable (Item 10)

WCA230A/WCA280A

Output

50 Ω N-N coaxial cable

Figure 4- 15: Initial test hookup

1. Prepare for the t est:

a. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

b. Set the generator controls:

Frequency 10 MHz................

Level --10 dBm....................

c. Hook up the signal generator: Connect the generator output through a

50 Ω N-N coaxial cable to the analyzer INPUT. See Figure 4--15.

2. Check frequency accuracy in the baseband:

a. Modify the analyzer default settings:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 10 MHz using

the numeric keypad.

4- 36

WCA230A & WCA280A Service Manual

Performance Tests

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 1 MHz using the general

purpose knob.

b. Measure peak frequency:

H Press the PEAK key to place the marker on the signal peak.

H Read the m arker readout. Confirm that the value is

10 MHz 1kHz.

H Press MEASURE > Carrier Frequency.

H Read the measurement result at the bottom of the screen. Confirm

that the value is 10 MHz 1.2 Hz.

3. Check frequency accuracy in the RF (WCA230A) /RF1 (WCA280A) band:

a. Modify the generator control:

Frequency 2 GHz................

b. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 2 GHz using the

numeric keypad.

c. Measure peak frequency:

H Press the PEAK key to place the marker on the signal peak.

H Read the m arker readout. Confirm that the value is

2 GHz 1.2 kHz.

H Press MEASURE > Carrier Frequency.

H Read the measurement result at the bottom of the screen. Confirm

that the value is 2 GHz 210 Hz.

STOP. Steps 4 and 5 are the tests in the RF2 and RF3 bands for WCA280A only.
For WCA230A, skip to step 6.

WCA230A & WCA280A Service Manual

4- 37

Performance Tests

4. Check frequency accuracy in the RF2 band for WCA280A:

a. Modify the generator control:

Frequency 5 GHz................

b. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 5 GHz using the

numeric keypad.

c. Measure peak frequency:

H Press the PEAK key to place the marker on the signal peak.

H Read the m arker readout. Confirm that the value is

5 GHz 1.5 kHz.

H Press MEASURE > Carrier Frequency.

H Read the measurement result at the bottom of the screen. Confirm

that the value is 5 GHz 510 Hz.

5. Check frequency accuracy in the RF3 band for WCA280A:

a. Modify the generator control:

Frequency 7 GHz................

b. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 7 GHz using the

numeric keypad.

c. Measure peak frequency:

H Press the PEAK key to place the marker on the signal peak.

H Read the m arker readout. Confirm that the value is

7 GHz 1.7 kHz.

H Press MEASURE > Carrier Frequency.

H Read the measurement result at the bottom of the screen. Confirm

that the value is 7 GHz 710 Hz.

4- 38

6. Disconnect the test equipment: Disconnect the cable at the analyzer input.

WCA230A & WCA280A Service Manual

Performance Tests

Spurious Response Test

Check that the spurious response is within the specified range for the analyzer.

Equipment
Required

Prerequisites Refer to page 4--10.

Signal generator

One signal generator (Item 2)

One 50 Ω N-N coaxial cable (Item 10)

WCA230A/WCA280A

Output

50 Ω N-N coaxial cable

Figure 4- 16: Initial test hookup

1. Prepare for the t est:

a. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

b. Modify the default controls:

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 10 MHz using the general

purpose knob.

H Press the RBW/FFT key on the front panel.

H Press the RBW/FFT side key to select Man.

H With the RBW side key, set the value to 50 kHz using the general

purpose knob.

WCA230A & WCA280A Service Manual

4- 39

Performance Tests

H Press the TRACE/AVG key on the front panel.

H Press the Trace 1 Typ e... side key and select Average.

H Press the Number Of Averages side key and set the value to 50.

H Press the MARKER SETUP key.

H Press the Markers side key to select Delta.

c. Set the generator controls:

Level --5 dBm....................

d. Hook up the signal generator: Connect the generator output through a

50 Ω N-N coaxial cable to the analyzer INPUT. See Figure 4--16.

2. Check spurious response:

a. Modify the generator controls: Set the generator output frequency to the

value as shown in Table 4--6 (initially 10 MHz).

b. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to the same value

as the generator output using the numeric keypad.

c. Measure the amplitude:

H Press the MARKER SETUP key.

H Press the Select Marker side key to select 1.

H Press the PEAK key and then the MARKERS: B (marker down)

key once to place the first marker at the peak on the noise floor.

H Press the Select Marker side key to select 2.

H Press the PEAK keytoplaceMarker2onthesignalpeak.

H Read the delta marker readout (∆1--2) on the screen. Check that the

components other than the carrier meet the requirement as shown in
Table 4--6 (initially --73 dBc).

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Performance Tests

d. Repeat substeps a through c until all frequency settings listed in

Table 4--6 are checked.

Table 4- 6: Spurious measurement

Band Frequency Spurious response

Baseband 10 MHz --73 dBc

RF (WCA230A) / RF1 (WCA280A) 2GHz --73 dBc

RF2 (WCA280A only) 5GHz --70 dBc

RF3 (WCA280A only) 7GHz --70 dBc

3. Disconnect the test equipment: Disconnect the cable at the analyzer input.

WCA230A & WCA280A Service Manual

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Performance Tests

Displayed Average Noise

Level Test

Check that the displayed average noise level is within the specified range for the
analyzer.

Equipment
Required

Prerequisites Refer to page 4--10.

WCA230A/WCA280A

None

Figure 4- 17: Initial test hookup

1. Prepare for the t est:

a. Initialize the analyzer:

H Press the SYSTEM key on the front panel.

H Press the Reset All to Factory Defaults side key.

b. Modify the analyzer controls:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 10 MHz using

the general purpose knob.

H Press the SPAN key on the front panel.

H With the Span side key, set the span to 1 MHz using the general

purpose knob.

H Press the AMPLITUDE key on the front panel.

H With the Ref Level side key, set the level to --30 dBm using the

general purpose knob.

H Press the RBW/FFT key on the front panel.

H Press the RBW/FFT side key to select Man.

H With the RBW side key, set the value to 10 kHz using the general

purpose knob.

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Performance Tests

H Press the TRACE/AVG key on the front panel.

H Press the Trace 1 Typ e... side key and select Average.

H Press the Number Of Averages side key and set the value to 50.

H Press MEASURE > Channel Power.

H Press MEAS SETUP > Channel Bandwidth and set the value to

1 MHz using the general purpose knob.

2. Check noise in the baseband: Read the measurement result of Density at the
bottom of t he screen. Check that the value is --151 dBm/Hz or less.

3. Check noise at 2 GHz in the RF (WCA230A) / RF1 (WCA280A) band:

a. Modify the analyzer control:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 2 GHz using the

general purpose knob.

H Press the AMPLITUDE key on the front panel.

H With the Ref Level side key, set the level to --50 dBm using the

general purpose knob.

H Press the RF Atten/Mixer side key to select RF Att.

H With the RF Att side key, set the attenuation to 0 dB using the

general purpose knob.

b. Check against limits: Read the measurement result of Density at the

bottom of t he screen. Check that the value is --150 dBm/Hz or less.

4. Check noise at 3 GHz in the RF (WCA230A) / RF1 (WCA280A) band:

a. Modify the analyzer control:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 3 GHz using the

general purpose knob.

b. Check against limits: Read the measurement result of Density at the

bottom of t he screen. Check that the value is --150 dBm/Hz or less.

WCA230A & WCA280A Service Manual

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Performance Tests

5. Check noise at 7 GHz in the RF3 band for WCA280A only:

a. Modify the analyzer control:

H Press the FREQUENCY/CHANNEL key on the front panel.

H With the Center Freq side key, set the frequency to 7 GHz using the

general purpose knob.

b. Check against limits: Read the measurement result of Density at the

bottom of t he screen. Check that the value is --142 dBm/Hz or less.

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WCA230A & WCA280A Service Manual