Agilent 8498A Operations Guide

8498A
Fixed Attenuator

Operating and Service
Manual

The contents of this manual apply
to instruments with serial number
prefix US91 and above.

Agilent Part Number: 08498-90008
Printed in USA
Print Date: April 2001
Supersedes: February 1999

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
copyright. All rights are reserved. No part of this document may be
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.

© Copyright 1997, 1999, 2001 Agilent Technologies, Inc.

ii Agilent Technologies 8498 Operating and Service Manual

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 w arranty period, Agile nt T echnol ogies 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 fac ility onl y upon Agil ent Tec hnologi es’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.
Howev er , Buyer sh all pay all ship ping char ges, duti es, and taxe s 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 warrant y shall not a pply
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.

Agilent Technologies 8498 Operating and Service Manual iii

EXCLUSIVE REMEDIES. THE REMEDIES PRO VIDED 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 assistan ce, ca ll your local Agi lent Technolog ies Sale s and S ervice Of f ice

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

iv Agilent Technologies 8498 Operating and Service Manual

Service and Support

By internet, phone, or fax, get assistanc e with all your test and meas urement
needs.

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

(tel) 1 800 452 4844

New Zealand

(tel) 0 800 738 378
(fax) ([phone]

Latin America

(tel) [phone]
(fax) [phone]

Japan

(tel) ([phone]
(fax) ([phone]

Canada

(tel) 1 877 894 4414
(fax) [phone]

Australia

(tel) 1 800 629 485
(fax) ([phone]

Europe

(tel) ([phone]
(fax) ([phone]

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)

Thailand [phone] (outside Bangkok)

[phone] (within Bangkok)
Hong Kong 800-930-871 (852) 2506 9233
Taiwan 0800-047-866 (886) 2 25456723

(632) 8426809
1-800-16510288 (PLDT
Subscriber Only)

(66) 1-661-3714

People’s Republic
of China

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

800-810-0189 (preferred)

10800-650-0021

10800-650-0121

Agilent Technologies 8498 Operating and Service Manual v

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 t he like, which, if not correctly performed or a dher ed
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.

vi Agilent Technologies 8498 Operating and Service Manual

Safety and Regulatory Information

Safety Earth Ground

This is a Safety Class I product (provided with a protective earthing
terminal). An uninterrup ti ble saf et y ear th gr ound must be pr o vided 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.

Befor e Applying P o wer Verify that the produ ct is configured to match the available main power

source as d escribed 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.

Agilent Technologies 8498 Operating and Service Manual vii

Typeface Conventions

Typeface Conventions

Italics

• Used to emphasize important information:

only

Use this software

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:

LOAD BIN filename.

Type

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

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

computer keyboard:

[Return].

Press

{Softkey} • Used for simulated keys that appea r on an instrum ent display:

{Prior Menu}.

Press

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

text shown in this typeface must be typed

LOAD PARMFILE

Type

CAL1 SAVED.

exactly

as printed:

• Used for examples of programming code:

#endif // ifndef NO_CLASS

Path Name

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

• Used for a subdirectory name or file path:

Edit the file

computer monitor:

Edit Parameters window will appear on the screen.

The

usr/local/bin/sample.txt

• 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.

viii Agilent Technologies 8498 Operating and Service Manual

Contents

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 Contents 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 sensit ive 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 fo ur char acte rs con sti tute the s erial nu mber pr ef i x. The r emaini ng d igits
form the sequential suffix that is unique to each attenuator.

The contents of this manual apply di rectly to t he attenuator s 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 especiall y t rue of power handling c apa bi li ty. 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.

Agilent Technologies 8498A Operating and Service Manual 1

Specifications

Specifications

Instrument specifications are listed in Table 1. These specifications are the
performance standa rds, or limits against which the attenuator may be tested.

Table 1 Specifications

Frequency Range dc to 18.0 GHz
Attenuation 30 ± 1.0 dB
Input Impedance 50 ohm, nominal
Maximum SWR (reflection coefficient) 1.15 (0.07) dc to 8.0 GHz

Power Range Up to 25 W CW
Maximum Input Power Average

Connectors Type N (male and female)

1.25 (0.11) 8.0 to12.4 GHz

1.30 (0.13) 12.4 to 18.0 GHz

1

30 W at 0 to ≤+35° C
25 W at > +35° C up to +55° C
Peak 500 W dc to ≤ 5.8 GHz
125 W > 5.8 GHz up to 18.0 GHz
Energy per pulse 500 W/µs

2

1. For pulses greater than 30W the maximum average power (Pa) is limited by the energy per pulse
(E) in W/µ

2. Compatible with IEE 287.

s according to Pa = 30 − 0.02E.

Supplemental characteristics in Table 2 are not specifications but are
typical characteristics supplied as additional information for the user.

Table 2 Supplemental Characteristics

Temperature Stability < 0.003 dB/° C
Power Sensitivity < 0.006 dB/W
Dimensions 83 x 114 x 152 mm (approx. 3.25 x 4.5 x 6.0 in.)
Weight 0.6 kg (1.25 lbs.)

2 Agilent Technologies 8498A Operating and Service Manual

Specifications

Operating Environment

The operating environment of the attenuator should be within the following
limitations:

Temperature.............................................................................0 to +55

Humidity................................................................<95% relative at 40

Altitude..........................................................<4,600 meters (15,000 feet)

Storage and Shipping Environment

The attenuator should be stored in a clean, dry environment. The following
environmental limitations apply to both storage and shipment:

Temperature......................................................................... -40 to +75

Humidity............................................................... <95% relative at 40

Altitude........................................................<15,300 meters (50,000 feet)

Mating Connectors The attenuator has Type N connectors, one male and one female. These

connectors mate with all Type N connectors whose dimensions are
compatible with IEEE 287.

° C
° C

° C

° C

Type-N Male Connector Type-N Female Connector

Center Conductor

Mating Plane

0.207 inch (5.258 mm)

Figure 1 Type N Connectors

minimum

Center Conductor

Mating Plane

Outer Conductor
Mating Plane

Outer Conductor
Mating Plane

0.207 inch (5.258 mm)
maximum

Agilent Technologies 8498A Operating and Service Manual 3

Installation

Installation

Initial Inspection 1. Inspect the shipping container for damage. If the shipping container or

cushioning material is damaged, it should be kept until the contents of
the shipment have been checked for completeness and the instrument
has been checked mechanically and electrically.

2. If the contents are incomplete, if there is mechanical damage or defect,
or if the inst rument doe s not pass the e lec tric al pe rforman ce te st , conta ct
the nearest Agilent Technologies Sales and Service office. Refer to the
Service and Support information in the front matter of this manual.
Agilent Technologies will arrange for repair or replacement of the
damaged or defective equipment. Keep the shipping materials for the

carrier’s inspection.

3. If you are returning the instrument for service, repack aging the
instrument requires original shipping containers and materials or their
equivalents. Agilent Technologies can provide packaging materials
identical to the original materials. Refe r to Service and Support
information in the front matter of this manual for the Agilent
Technologies nearest you. Attach a tag indicating the type of service
required, re turn address, model number, and serial number. Mark the
container FRAGILE to insure careful handling. In any correspondence,
refer to the instrument by model number and serial number.

Preparation For Use When you install the attenuator, make sure that the connectors do not

support weight or bear torque. Take care not to drop or mechanically
damaged the attenuator.

4 Agilent Technologies 8498A Operating and Service Manual

Operating Information

Operating Information

Principles of Operation

The attenuation is achieved by a resistive film deposition on a beryllium
oxide substrate. The high po wer hea t is dissip ated by f ins in the cooling cage
that surrounds the attenuator cartridge assembly.

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.

Operator’s Check The most accurate check of the attenua tor is made usi ng a netwo rk analyz er.

However, a simplified operator’s check of the attenuator can be made by
using either the substitution or insertion loss method.

• If a similar attenu ator of kno wn acc ura cy is a vailable, a refer en ce can be

established and then the unknown attenuator can be substituted in place
of the reference attenuator. If a known good attenuator is not available,
establish a reference on the measuring equipment, insert the device
under test, and check for the proper attenuated signal level.

• Use an RF source in the proper frequency range and a detector with

readout device. Equipment should have sufficient accuracy to show that
the attenua t or is working .

Performance Tests The best method f or testing the attenuator is with an automatic networ k

analyzer or equivalent equipment of suitable accuracy. This method will
allow greater accuracy of measurement since system ambiguities can be

corrected. Simple quick-check techniques are mentioned under Operator’s
Check above. These techniques will provide a reasonable degree of
confidence that the attenuator meets its specifications.

Agilent Technologies 8498A Operating and Service Manual 5

Service

Service

Repair Repair of the attenuator is limited to the replacement of the attenuator

cartridge assembly (16) shown in Figure 2.
Refer to Figu re 2 to identify the numbered items in the fo llowing procedur e.

Attenuator Disassembly Procedure

1. Remove the 8 screws (10) that hold the two attenuator housings
(9) and (30) and remove the housings.

2. Remove the three screws (36) and lock washers (35) from both ends of
the attenuator assembly.

3. Remove the end fins (31) and (34), the RFI seals (11) and (19),
spacers (33), and the framed attenuator fins (32).

4. Remove the three cap screws (12) from both ends of the attenuator
assembly. It may be necessary to move the housing slightly to remove
the screws.

5. Slide the inner connector bodies (14) and (18) from the attenuator
cartridge assembl y (16) . Be care ful not to le t t he sli ding co ntact s (8 ) and
(29) and compressi on spri ngs (7 ) a nd (28) slid e from t he cont act h old ers
(6) and (27). Under normal conditions they will not slide out.

6. At this point the attenuator cartridge assembly (16) and the shim
washers are free from the overall assembly and can be returned to
Agilent Technologies. The attenuator cartridge assembly is the housing
for the attenuator card, the card half sections, and the shims.

Attenuator Reassembly Procedure

1. Place the framed attenuat or f ins (32), “D” ring spacers (33 ), and end f ins
(31) and (34) on the attenuator cartridge assembly (16).

2. Position the RFI seals (11) and (19) and install end fins (31) and (34)
with screws (36) and lock washers (35).

3. Install the connector assemblies with the six scr ews (12). Use t he e nd of
a toothpick to apply two smal l drops of Loct ite 262 for eac h scre w to the
threads in the atten uator body (16). T i ghten the scre ws e venly to a torque
specification of 0.90 Nm (8 in-lbs).

CAUTION Overtighteni ng sc rews (12) beyo nd th e specified torq ue may di stort the card

clamp half sections and fracture the attenuator card.

6 Agilent Technologies 8498A Operating and Service Manual

Service

WARNING Under no circumstances is the attenuator card to be machined, ground or

scraped. Beryllium oxide in a powder form is a hazardous material may be
injurious to your health if inhaled. Defective attenuator cards should be
returned to Agilent Technologies for proper disposal.

4. Install the eight screws (10) that hold the two housings (9) and (30).

Troubleshooting To troubleshoot the attenuator perform the operator’s check. If the

instrument does not perform within limits, check the connectors. If the
connectors are not damaged, replace the attenuator cartridge assembly.

37

37

37

Figure 2 Attenuator Exploded View

Agilent Technologies 8498A Operating and Service Manual 7

Replacement Parts

Replacement Parts

To order a part listed in the replacement parts table, contact the nearest
Agilent Technologies office. Refer to “Service and Support” on page v.

Table 3 Replaceable P a rts

Reference
Designation

1 08498-80001 1 Outer connector body Type N, female
2 1250-0915 1 Contact-RF connector series 7 mm-N; female
3 5040-0306 2 Insulator
4 08498-20014 2 Center conductor
5 08498-20019 2 Damper
6 08498-20016 2 Contact holder
7 1460-1618 2 Spring-CPRSN .054-IN-OD .258-IN-0A-LG
8 5020-3297 2 Contact, sliding
9 08498-40002 2 Attenuator housing
10 2200-0145 8 Screw-MACH 4-40 .438-IN-LG PAN-HD-POZI
11 08498-20024 2 RFI seal
12 3030-0070 1 Screw-SKT HD CAP 4-40 .625-IN-LG ALY STL

14 08498-20013 2 Inner connector body

Part Number QTY Description

0470-1590 A/R Loctite 262**

15 08498-20018 2 Insulator
16 08498-60002 1 Attenuator cartridge assembly
17 08498-20018 Insulator
18 08498-20013 Inner connector body
19 08498-20024 RFI seal
20 1250-0918 1 Component-RF connector series 7 mm-N; SST
21 1250-0016 1 Component-RF connector series N; .75 IN
22 1250-0916 1 Body-RF connector series 7 mm-N straight
23 1250-0917 1 Contact-RF connector series 7 mm-N; male
24 5040-0306 Insulator
25 08498-20014 Center conductor
26 08498-20019 Damper

8 Agilent Technologies 8498A Operating and Service Manual

Table 3 Replaceable P a rts (Continued)

Replacement Parts

Reference
Designation

27 08498-20016 Contact holder
28 1460-1618 Spring-CPRSN .054-IN-OD .258-IN-0A-LG
29 5020-3297 Contact, sliding
30 08498-40002 Attenuator housing
31 08498-00002 2 End fin
32 08498-40001 6 Framed attenuator fin
33 08498-00005 1 D ring spacer*
34 08498-00002 End fin
35 2190-0014 1 Washer-LK INTL T NO. 2 .089-IN-ID
36 0520-0129 6 Screw-MACH 2-56 .312-IN-LG PAN-HD-POZI
37 08498-60006 1 Attenuator assembly

* NOTE: Some attenuators may have two spacers instead of one; 08498-00005 is the direct

replacement.

** Not shown

Part Number QTY Description

7120-7127** 1 Label, identification

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

Part Qty. Part Number

30 dB, 25W attenuator card 1 1GT1-2674
Attenuator body 1 08498-20011
Card clamp half section 2 08498-20025
Washer 2 08498-20017
Lock 2 08498-20022
Tuning screw 2 08498-20023

Agilent Technologies 8498A Operating and Service Manual 9