Tektronix 2706 Service manual
Instruction Manual
2706
RF Preselector
070-8545-02
Warning
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 © T ektronix, Inc. All rights reserved.
T ektronix 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.
T ektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix 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 proves defective during this warranty period, T ektronix, at its
option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
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 T ektronix, 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 the T ektronix 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 improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than T ektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a
product that has been modified or integrated with other products when the effect of such modification or
integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF
ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
P ARTICULAR 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.
Contents
User Information
List of Figures ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Welcome iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About this Manual iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What you Need to Know iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use This Manual iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Conventions v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting T ektronix v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preselector Controls and Connectors 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What you Need to Use the Preselector 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Preselector 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Operation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Operation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Common and Device Commands 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Information
Appendixes
Performance Verification 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification Procedure 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Fuse 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applications 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EMI Testing 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Susceptibility T esting 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Benchtop Analysis 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Specifications A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Specifications A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certifications and Compliances A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Using the GPIB Interface B–1. . . . . . . . . . . . . . . . . . . . . . . . .
Interface Compatibility B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Commands B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample Program B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Commands B–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2706 RF Preselector
i
Contents
List of Figures
Appendix C: Options C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Options C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 01 C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Parts List D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix E: Repackaging for Shipment E–1. . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–1: The Preselector’s Front Panel 1–1. . . . . . . . . . . . . . . . . . . . . .
Figure 1–2: The Preselector’s Rear Panel 1–2. . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: The fuse location 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables
Table 2–1: Commands Supported by the Preselector 2–3. . . . . . . . . . . . .
Table A–1: Preselector Band Related Specifications A–1. . . . . . . . . . . . . .
Table A–2: Certifications and compliances A–3. . . . . . . . . . . . . . . . . . . . .
ii
2706 RF Preselector
Preface
Welcome
This preface describes the features of the Tektronix 2706 stepped Radio
Frequency Preselector. It also tells you how to use this manual and what you
should know before you use the Preselector.
Congratulations on your purchase of a 2706 RF Preselector. This instrument
improves the flexibility and accuracy of your spectrum analyzer measurements,
and is especially useful for EMI applications.
Some of the outstanding characteristics of the Preselector are:
H Multiple filters – the Preselector has 7 bandpass filter steps covering the
range from 9 kHz to 1000 MHz, and a high-pass filter covering the range
from 1000 MHz to 1800 MHz.
H Reduced distortion – the Preselector limits potentially distorting input to a
spectrum analyzer by attenuating signals outside the frequency range of
interest.
About this Manual
H Increased broadband dynamic range – the Preselector increases sensitivity to
low-level signals by attenuating strong signals outside the frequency range of
interest.
H Manual or remote operation – you can operate the Preselector using its
front-panel controls or a GPIB equipped controller or computer.
H Bypass mode – you can remove the Preselector from the testing circuit
without disconnecting it.
H Convenient installation – the Preselector mounts below Tektronix 271X-
Series Spectrum Analyzers with the optional mounting plate and rigid
coaxial cable assembly (see the Parts List in Appendix D).
This manual contains the following sections:
H Chapter 1, “Introduction,” lists the features of the Tektronix 2706 RF
Preselector and what you need to use the Preselector.
H Chapter 2, “Using the Preselector,” describes how to control the Preselector
manually or using a GPIB controller.
2706 RF Preselector
iii
Preface
H Chapter 3, “Performance Verification,” tells you how to check that the
Preselector is operating within specification, and how to troubleshoot
problems with the Preselector.
H Chapter 4, “Applications,” describes ways you can use the Preselector.
H Appendix A, “Specifications,” lists the electrical, environmental, and
mechanical specifications of the Preselector.
H Appendix B, “Using the GPIB Interface,” describes in detail the commands
you use to operate the Preselector remotely.
H Appendix C, “Options,” describes in detail the power cord and extended
service options of the Preselector.
H Appendix D, “Parts List,” lists the part numbers of the standard and optional
Preselector accessories.
H Appendix E, “Repackaging for Shipment,” describes how to package the
Preselector for shipment.
What you Need to Know
How to Use This Manual
To use this manual, you need to know two things:
H How to operate a spectrum analyzer.
H The basic concepts of signal analysis.
If you plan to operate the Preselector remotely, you also need to know how to
use your GPIB controller.
This manual is designed to help you learn to use the Preselector quickly and
easily.
Follow these steps to use this manual:
1. Read the rest of this preface.
2. Read Chapter 1, “Introduction,” for an overview of the Preselector’s features.
3. Follow the instructions in Chapter 2, “Using the Preselector,” to learn how to
use the Preselector.
4. Use Chapter 3, “Performance Verification,” and Appendix A, “Specifica-
tions,” to check that the Preselector is working correctly.
iv
2706 RF Preselector
Manual Conventions
Contacting Tektronix
Preface
5. Use Chapter 4, “Applications,” to see ways you can use the Preselector.
6. If you plan to operate the Preselector from a GPIB controller, use Appendix
B, “Using the GPIB Interface.”
To make this manual easier to use, text is shown in several type styles:
H References to other manuals or documents are in italics: ANSI/IEEE Std
488.2–1987.
H Command names, and panel and cable labels are in bold type.
H Text that you type into a GPIB controller is in single space type.
Product
Support
Service
support
Toll-free
Number
Postal
Address
Web site www.tektronix.com
For questions about using Tektronix measurement products, call
toll free in North America:
1-800-833-9200
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Tektronix offers a range of services, including Extended
Warranty Repair and Calibration services. Contact your local
Tektronix distributor or sales office for details.
For a listing of worldwide service centers, visit our web site.
In North America:
1-800-833-9200
An operator can direct your call.
Tektronix, Inc.
Department or name (if known)
P.O. Box 500
Beaverton, OR 97077
USA
2706 RF Preselector
v
Preface
vi
2706 RF Preselector
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.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
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.
Connect and Disconnect Properly . Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
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.
Connect the ground lead of the probe to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
2706 RF Preselector
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.
Keep Product Surfaces Clean and Dry .
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
vii
General Safety Summary
Symbols and Terms
T erms 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.
T erms on the Product. These terms 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:
CAUTION
Refer to Manual
WARNING
High Voltage
Double
Insulated
Protective Ground
(Earth) Terminal
Not suitable for
connection to
the public telecom-
munications network
viii
2706 RF Preselector
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, then
disconnect the power cord from the mains power.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this 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.
2706 RF Preselector
ix
Service Safety Summary
x
2706 RF Preselector
User Information
Introduction
This chapter describes the features of the Tektronix 2706 RF Preselector and
what you need to use it.
Preselector Controls and Connectors
This section presents a brief tour of the Preselector controls and connectors.
Front Panel
Figure 1–1: The Preselector’s Front Panel
The Preselector front panel has the following controls:
H POWER switch – this turns instrument operating power on (1) or off (0).
H REMOTE/LOCAL switch – this transfers control of the Preselector from
remote (GPIB controlled) mode to local (manually controlled) mode. The
REMOTE LED lights when remote mode is selected.
H BYPASS switch – this disconnects all Preselector filters so that the entire RF
signal is sent directly to the spectrum analyzer. The BYPASS LED lights
when bypass mode is selected.
2706 RF Preselector
H BAND SELECT <- and -> switches – these select the signal routing band from
among 7 bandpass filters and a high-pass filter. An LED lights on the front
panel to indicate the selected filter.
H RF INPUT – this connects the Preselector to the signal source using a type N
plug.
H RF OUTPUT – this connects the preselected output to the spectrum analyzer
using a type N plug.
1–1
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