Tektronix 2706 User 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

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, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

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 proves defective during this warranty period, Tektronix, 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 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 the 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 improper 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, 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

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.

2706 RF Preselector

i

Contents

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 Tektronix v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

User Information

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

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 Testing 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Benchtop Analysis 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendixes

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

ii

2706 RF Preselector

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. . . . . . . . . . . . . . . . . . . . . . . .

List of Figures

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. . . . . . . . . . . . . . . . . . . . .

2706 RF Preselector

iii

Preface

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.

Welcome

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.

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).

About this Manual

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.

Preface

iv

2706 RF Preselector

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

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.

How to Use This Manual

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.

Preface

2706 RF Preselector

v

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.”

Manual Conventions

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.

Contacting Tektronix

Product

Support

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:

[email protected]

For product support outside of North America, contact your

local Tektronix distributor or sales office.

Service

support

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.

Toll-free

Number

In North America:

1-800-833-9200

An operator can direct your call.

Postal

Address

Tektronix, Inc.

Department or name (if known)

P.O. Box 500

Beaverton, OR 97077

USA

Web site www.tektronix.com

Preface

vi

2706 RF Preselector

vii

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.

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.

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.

To Avoid Fire or

Personal Injury

General Safety Summary

viii

2706 RF Preselector

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.

Terms 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

Symbols and Terms

2706 RF Preselector

ix

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.

Service Safety Summary

x

2706 RF Preselector

User Information

2706 RF Preselector

1–1

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.

The Preselector front panel has the following controls:

Figure 1–1: The Preselector’s Front Panel

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.

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.

Front Panel

Introduction

1–2

2706 RF Preselector

The Preselector rear panel has these connectors and switches:

Figure 1–2: The Preselector’s Rear Panel

H IEEE STD 488 PORT – this connects the Preselector to a controller.

H ADDRESS switch – this selects the GPIB address for the Preselector.

H POWER – this plugs the Preselector into the AC power source

(90–250 VAC, 48–63 Hz).

What you Need to Use the Preselector

To use the Preselector, you need the following:

H an RF signal source, such as an antenna or test device (Chapter 4, “Applica-

tions,” describes example setups)

H a spectrum analyzer, such as the Tektronix 271X–, 278X–, or 279X–Series

(or equivalent)

H two RF connecting cables with type N connectors or adapters

If you will operate the Preselector remotely, you will also need the following:

H an IEEE STD 488 GPIB 24-pin cable with a D-type shell (Tektronix part

number 012–0991–00)

H an IEEE–488 GPIB controller, or an IBM PC/AT or compatible 80386 (or

better) personal computer with a National Instruments PCII/IIA type card

and communications drivers

H a copy of the Tektronix S26EM12 Commercial EMI Test Software (optional)

Rear Panel

2706 RF Preselector

2–1

Using the Preselector

This chapter describes how to operate the Preselector manually or with a GPIB

controller.

Manual Operation

This section tells you how to use the Preselector manually by using its front-pan-

el controls.

Use the Preselector as follows:

1. Plug the Preselector into a power source (90–250 VAC, 48–63 Hz).

2. Connect the spectrum analyzer input to the RF OUTPUT connector on the

Preselector’s front panel.

3. Turn on the Preselector. The front-panel LEDs will light sequentially. When

the BYPASS LED lights, the unit is ready to use.

NOTE. If any of the LEDs do not light, refer to Chapter 3, Performance

Verification.

4. Turn on the spectrum analyzer.

5. Use the BAND SELECT <- and -> switches to select the filter you want. The

Preselector will pass the frequency range printed above and below the lit

LED.

6. Connect the RF source to the RF INPUT connector on the Preselector’s front

panel.

The Preselector is now ready for operation.

Remote Operation

This section tells you how to operate the Preselector remotely with a controller

or computer that uses the IEEE Standard 488.2-1987 (GPIB) interface.

The smallest GPIB network that you can use is a Preselector and a controller;

you will also probably connect a spectrum analyzer to the network.

Using the Preselector

2–2

2706 RF Preselector

NOTE. To operate the Preselector remotely, you need to consult the documenta-

tion for your controller to determine how to send commands and interpret

received messages in your controller’s programming language.

Use the Preselector remotely as follows:

1. Plug the Preselector into a power source (90–250 VAC, 48–63 Hz).

2. Connect the spectrum analyzer input to the RF OUTPUT connector on the

Preselector’s front panel.

3. Connect a GPIB 24-pin cable to the IEEE STD 488 PORT connector on the

rear panel of your Preselector and to the GPIB network.

4. Verify that the bus address on the rear-panel ADDRESS switch is not used by

any other device on the network. If the address is used by another device, use

the switch to select a new address. The Preselector will use the new address

when it is turned on.

5. To make sure that your GPIB network will operate reliably, verify that:

H Each device on the network has a unique device address.

H The network has fewer than 16 devices.

H No more than 2 meters (6 feet) of cable separates any two devices, and

that the entire network uses less than 20 meters (65 feet) of GPIB cable.

H At least two-thirds of the devices on the network are turned on when the

network is operating.

H The network uses a star or linear configuration, not a loop or parallel

configuration.

6. Turn on the Preselector. The front-panel LEDs will light sequentially. When

the BYPASS LED lights, the unit is ready to use.

NOTE. If the LEDs do not light, refer to Chapter 3, Performance Verification.

Pressing the REMOTE/LOCAL switch will not turn on remote operation; it only

turns remote operation off.

7. Turn on the spectrum analyzer.

8. Turn on the controller and start the GPIB communications software.

9. Connect the RF source to the RF INPUT connector on the Preselector’s front

panel.

Using the Preselector

2706 RF Preselector

2–3

The Preselector is now ready for remote operation. You can operate it by using a

controller to send commands described in the following GPIB Common and

Device Commands section.

Refer to Appendix B, Using the GPIB Interface, and your controller’s operating

manual for detailed information about sending GPIB commands.

GPIB Common and Device Commands

This section briefly lists the common and device commands used to operate the

Preselector from a remote GPIB controller. Appendix B, Using the GPIB

Interface, contains a detailed, alphabetical listing of these commands and

provides an example program.

Common commands (preceded by an asterisk in Table 2.1) are used by all

devices that meet IEEE Std. 488.2-1987. Device commands (listed without an

asterisk in Table 2.1) are specific to the Preselector and are defined only in this

manual. The Preselector has two device commands: B and STS?.

NOTE. You do not need to use timing commands such as *WAI, *OPC, and

*OPC? with the Preselector. For example, the *WAI command normally prevents

a GPIB device from executing commands until all pending operations finish.

Because the Preselector executes commands sequentially, the *WAI command

always continues immediately.

Table 2–1: Commands Supported by the Preselector

Name

Full Command Title

B<NR1> Select band filter (NR1 stands for an integer from 0 to 8)

*CLS Clear Status

*ESE and *ESE? Standard Event Status Enable

*ESR? Standard Event Status Register Query

*IDN? Identification Query

*IST? Individual Status Query

*OPC and *OPC? Operation Complete

*PRE and *PRE? Parallel Poll Register Enable

*RST Reset

*SRE and *SRE? Service Request Enable

*STB? Read Status Byte

STS? Status Selected Band Query

Using the Preselector

2–4

2706 RF Preselector

Table 2–1: Commands Supported by the Preselector (Cont.)

Name

Full Command Title

*TST? Self-Test

*WAI Wait To Continue

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Tektronix 2706 User manual

Tektronix 2706 User manual

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