Agilent Technologies 8498A Manuel de service

8498A

Fixed Attenuator

Operating and Service

Manual

Agilent Part Number: 08498-90008

Printed in USA

Print Date: April 2001

Supersedes: February 1999

The contents of this manual apply

to instruments with serial number

prefix US91 and above.

ii Agilent Technologies 8498 Operating and Service Manual

Notice

The information contained in this document is subject to change without

notice.

Agilent Technologies makes no warranty of any kind with regard to this

material, including, but not limited to, the implied warranties of

merchantability and fitness for a particular purpose. Agilent Technologies

shall not be liable for errors contained herein or for incidental or

consequential damages in connection with the furnishing, performance, or

use of this material.

Agilent Technologies assumes no responsibility for the use or reliability of

its software on equipment that is not furnished by Agilent Technologies.

This document contains proprietary information which is protected by

photocopied, reproduced, or translated to another language without prior

written consent of Agilent Technologies.

Restricted Rights Legend

Use, duplication, or disclosure by the U.S. Government is subject to

restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical

Data and Computer Software clause at DFARS 252.227-7013 for DOD

agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer

Software Restricted Rights clause at FAR 52.227-19 for other agencies.

Agilent Technologies, Inc

Santa Rosa Systems Division

1400 Fountaingrove Parkway

Santa Rosa, CA 95403-1799, U.S.A.

Agilent Technologies 8498 Operating and Service Manual iii

Warranty

Certification Agilent Technologies certifies that this product met its published specifications at the time of

shipment from the factory. Agilent Technologies further certifies that its calibration

measurements are traceable to the United States National Institute of Standards and

Technology (NIST, formerly NBS), to the extent allowed by the Institute’s calibration facility,

and to the calibration facilities of other International Standards Organization members.

Warranty This Agilent Technologies system product is warranted against defects in

materials and workmanship for a period corresponding to the individual

warranty periods of its component products. Instruments are warranted for a

period of one year. During the warranty period, Agilent Technologies will, at

its option, either repair or replace products that prove to be defective.

Warranty service for products installed by Agilent Technologies and certain

other products designated by Agilent Technologies will be performed at

Buyer’s facility at no charge within Agilent Technologies service travel

areas. Outside Agilent Technologies service travel areas, warranty service

will be performed at Buyer’s facility only upon Agilent Technologies’s prior

agreement and Buyer shall pay Agilent Technologies’s round trip travel

expenses. In all other areas, products must be returned to a service facility

designated by Agilent Technologies.

For products returned to Agilent Technologies for warranty service, Buyer

shall prepay shipping charges to Agilent Technologies and Agilent

Technologies shall pay shipping charges to return the product to Buyer.

However, Buyer shall pay all shipping charges, duties, and taxes for products

returned to Agilent Technologies from another country.

Agilent Technologies warrants that its software and firmware designated by

Agilent Technologies for use with an instrument will execute its

programming instructions when properly installed on that instrument.

Agilent Technologies does not warrant that the operation of the instrument,

or software, or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY. The foregoing warranty shall not apply

to defects resulting from improper or inadequate maintenance by Buyer,

Buyer-supplied software or interfacing, unauthorized modification or

misuse, operation outside of the environmental specifications for the

product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT

TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED

WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE.

iv Agilent Technologies 8498 Operating and Service Manual

EXCLUSIVE REMEDIES. THE REMEDIES PROVIDED HEREIN ARE

BUYER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT

TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT,

INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY

OTHER LEGAL THEORY.

Assistance Product maintenance agreements and other customer assistance agreements

are available for Agilent Technologies products.

For assistance, call your local Agilent Technologies Sales and Service Office

(refer to “Service and Support” on page v).

Agilent Technologies 8498 Operating and Service Manual v

Service and Support

By internet, phone, or fax, get assistance with all your test and measurement

needs.

Online assistance: www.agilent.com/find/assist

United States

(tel) 1 800 452 4844 Latin America

(tel) (305) 269 7500

(fax) (305) 269 7599

Canada

(tel) 1 877 894 4414

(fax) (905) 282-6495

Europe

(tel) (+31) 20 547 2323

(fax) (+31) 20 547 2390

New Zealand

(tel) 0 800 738 378

(fax) (+64) 4 495 8950

Japan

(tel) (+81) 426 56 7832

(fax) (+81) 426 56 7840

Australia

(tel) 1 800 629 485

(fax) (+61) 3 9210 5947

Asia Call Center Numbers

Country Phone Number Fax Number

Singapore 1-800-375-8100 (65) 836-0252

Malaysia 1-800-828-848 1-800-801664

Philippines (632) 8426802

1-800-16510170 (PLDT

Subscriber Only)

(632) 8426809

1-800-16510288 (PLDT

Subscriber Only)

Thailand (088) 226-008 (outside Bangkok)

(662) 661-3999 (within Bangkok) (66) 1-661-3714

Hong Kong 800-930-871 (852) 2506 9233

Taiwan 0800-047-866 (886) 2 25456723

People’s Republic

of China 800-810-0189 (preferred)

10800-650-0021 10800-650-0121

India 1-600-11-2929 000-800-650-1101

vi Agilent Technologies 8498 Operating and Service Manual

Safety and Regulatory Information

Review this product and related documentation to familiarize yourself with

safety markings and instructions before you operate the instrument. This

product has been designed and tested in accordance with international

standards.

WARNING The WARNING notice denotes a hazard. It calls attention to a procedure,

practice, or the like, that, if not correctly performed or adhered to, could result

in personal injury. Do not proceed beyond a WARNING notice until the

indicated conditions are fully understood and met.

CAUTION The CAUTION notice denotes a hazard. It calls attention to an operating

procedure, practice, or the like, which, if not correctly performed or adhered

to, could result in damage to the product or loss of important data. Do not

proceed beyond a CAUTION notice until the indicated conditions are fully

understood and met.

Instrument Markings

When you see this symbol on your instrument, you should refer to the instrument’s

instruction manual for important information.

This symbol indicates hazardous voltages.

The laser radiation symbol is marked on products that have a laser output.

This symbol indicates that the instrument requires alternating current (ac) input.

The CE mark is a registered trademark of the European Community. If it is

accompanied by a year, it indicates the year the design was proven.

The CSA mark is a registered trademark of the Canadian Standards Association.

1SM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group 1

Class A product (CISPER 11, Clause 4).

This symbol indicates that the power line switch is ON.

This symbol indicates that the power line switch is OFF or in STANDBY position.

Agilent Technologies 8498 Operating and Service Manual vii

Safety and Regulatory Information

Safety Earth

Ground This is a Safety Class I product (provided with a protective earthing

terminal). An uninterruptible safety earth ground must be provided from the

main power source to the product input wiring terminals, power cord, or

supplied power cord set. Whenever it is likely that the protection has been

impaired, the product must be made inoperative and secured against any

unintended operation.

Before Applying Power Verify that the product is configured to match the available main power

source as described in the input power configuration instructions in this

manual. If this product is to be powered by autotransformer, make sure the

common terminal is connected to the neutral (grounded) side of the ac power

supply.

viii Agilent Technologies 8498 Operating and Service Manual

Typeface Conventions

Italics

•Used to emphasize important information:

Use this software

only

with the xxxxxX system.

•Used for the title of a publication:

Refer to the xxxxxX System-Level User’s Guide.

•Used to indicate a variable:

Type LOAD BIN filename.

Instrument Display •Used to show on-screen prompts and messages that you will see on the

display of an instrument:

The xxxxxX will display the message CAL1 SAVED.

[Keycap] •Used for labeled keys on the front panel of an instrument or on a

computer keyboard:

Press [Return].

{Softkey} •Used for simulated keys that appear on an instrument display:

Press {Prior Menu}.

User Entry •Used to indicate text that you will enter using the computer keyboard;

text shown in this typeface must be typed

exactly

as printed:

Type LOAD PARMFILE

•Used for examples of programming code:

#endif // ifndef NO_CLASS

Path Name

•Used for a subdirectory name or file path:

Edit the file

usr/local/bin/sample.txt

Computer Display •Used to show messages, prompts, and window labels that appear on a

computer monitor:

The Edit Parameters window will appear on the screen.

•Used for menus, lists, dialog boxes, and button boxes on a computer

monitor from which you make selections using the mouse or keyboard:

Double-click EXIT to quit the program.

Contents

Agilent Technologies 8498A Operating and Service Manual Contents 1

Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Service and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v

Safety and Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii

Typeface Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Attenuator Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Table 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Table 2. Supplemental Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 2

Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Storage and Shipping Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Mating Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 1. Type N Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Preparation For Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operator’s Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. Attenuator Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3. Replaceable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 4. Attenuator Cartridge Assembly Parts (Item 16 in Figure 2) . 9

Agilent Technologies 8498A Operating and Service Manual 1

General Information

Attenuator Overview The 8498A is a 30 dB, 30 W (25 W between +35° ×C and + 55°C) fixed

attenuator with Type N connectors. Either connector may be used as the

input or output connector.

•The attenuator is designed to work in a 50 ohm system, and operates

over the frequency range from dc to 18.0 GHz.

•The attenuator may be used (1) to reduce a high power signal to a level

that is compatible with sensitive equipment, (2) to reduce reflections, or

(3) as a known attenuation for substitution.

Instruments Covered By Manual

The attenuators covered by this manual have a two-part serial number. The

first four characters constitute the serial number prefix. The remaining digits

form the sequential suffix that is unique to each attenuator.

The contents of this manual apply directly to the attenuators having the serial

prefix US91. An attenuator manufactured after the printing of this manual

may have a serial prefix that is not noted above. This unlisted serial prefix

indicates that the attenuator differs in some respect from the information in

this manual.

Warranty

The attenuator is warranted and certified as indicated on the warranty page

of this manual. For further information, contact the nearest Agilent

Technologies Sales and Service office. Refer to “Service and Support” on

page v.

The attenuator is warranted only when it is operated within its specifications.

This is especially true of power handling capability. Any attenuator returned

to Agilent Technologies under warranty will be examined carefully to

determine if the failure was possibly due to improper use.

Safety Considerations The warning that follows is related to possible personal injury.

WARNING The high power attenuator card has a substrate of beryllium oxide. Beryllium

oxide in a powder form is a hazardous material and may be injurious to your

health if inhaled. Do not perform any operation on the beryllium oxide that

might generate dust. Defective attenuator cards should be returned to Agilent

Technologies for proper disposal.

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