Agilent 8498A 固定衰减器操作和维修手册说明书-USB迷|专注于互联网分享

2024年10月30日发(作者：系怜阳)

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

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.

iiAgilent Technologies 8498 Operating and Service Manual

Certification

Warranty

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.

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.

Agilent Technologies 8498 Operating and Service Manualiii

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 pagev).

ivAgilent Technologies 8498 Operating and Service Manual

Service and Support

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

needs.

Online assistance: /find/assist

United States

(tel)180****4844

New Zealand

(tel) 0 800 738 378

(fax) (+64) 4 495 8950

Latin America

(tel) (305) 269 7500

(fax) (305) 269 7599

Japan

(tel) (+81) 426 56 7832

(fax) (+81) 426 56 7840

Canada

(tel)187****4414

(fax) (905) 282-6495

Australia

(tel) 1 800 629 485

(fax) (+61) 3 9210 5947

Europe

(tel) (+31) 20 547 2323

(fax) (+31) 20 547 2390

Asia Call Center Numbers

Country

Singapore

Malaysia

Philippines

Phone Number

1-800-375-8100

1-800-828-848

(632) 8426802

1-800-16510170 (PLDT

Subscriber Only)

(088) 226-008 (outside Bangkok)

(662) 661-3999 (within Bangkok)

800-930-871

0800-047-866

800-810-0189 (preferred)

10800-650-0021

1-600-11-2929

Fax Number

(65) 836-0252

1-800-801664

(632) 8426809

1-800-16510288 (PLDT

Subscriber Only)

(66) 1-661-3714

(852) 2506 9233

(886) 2 25456723

10800-650-0121

000-800-650-1101

Thailand

Hong Kong

Taiwan

People’s Republic

of China

India

Agilent Technologies 8498 Operating and Service Manualv

WARNING

CAUTION

Instrument Markings

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.

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.

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.

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-AThis 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.

viAgilent 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 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.

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.

Before Applying Power

Agilent Technologies 8498 Operating and Service Manual vii

Italics

Instrument Display

[Keycap]

{Softkey}

User Entry

Path Name

Computer Display

Typeface Conventions

•

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

•

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

•

Used for labeled keys on the front panel of an instrument or on a

computer keyboard:

Press

[Return]

•

Used for simulated keys that appear on an instrument display:

Press

{Prior Menu}

•

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

•

Used for a subdirectory name or file path:

Edit the file

usr/local/bin/

•

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.

viiiAgilent 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 ications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Table mental Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 2

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

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

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

Figure 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 ator Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

Table eable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

Agilent Technologies 8498A Operating and Service ManualContents 1

General Information

Attenuator Overview

Safety Considerations

WARNING

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

pagev.

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.

The warning that follows is related to possible personal injury.

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 Manual1

Specifications

Instrument specifications are listed in Table 1. These specifications are the

performance standards, or limits against which the attenuator may be tested.

Table 1Specifications

Frequency Range

Attenuation

Input Impedance

Maximum SWR (reflection coefficient)

dc to 18.0 GHz

30 ± 1.0 dB

50 ohm, nominal

1.15 (0.07) dc to 8.0 GHz

1.25 (0.11) 8.0 to12.4 GHz

1.30 (0.13) 12.4 to 18.0 GHz

Up to 25 W CW

Average

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

ConnectorsType N (male and female)

Power Range

Maximum Input Power

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

(E) in W/µ

according to Pa = 30 − 0.02E.

2. Compatible with IEE 287.

Supplemental characteristics in Table 2 are not specifications but are

typical characteristics supplied as additional information for the user.

Table 2Supplemental Characteristics

Temperature Stability

Power Sensitivity

Dimensions

Weight

< 0.003 dB/° C

< 0.006 dB/W

83 x 114 x 152 mm (approx. 3.25 x 4.5 x 6.0 in.)

0.6 kg (1.25 lbs.)

2Agilent Technologies 8498A Operating and Service Manual

Operating

Environment

Storage and Shipping

Environment

Mating Connectors

Figure 1

Specifications

The operating environment of the attenuator should be within the following

limitations:

0 to +55

<95% relative at 40

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

The attenuator should be stored in a clean, dry environment. The following

environmental limitations apply to both storage and shipment:

-40 to +75

<95% relative at 40

<15,300 meters (50,000 feet)

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.

Type-N Male ConnectorType-N Female Connector

Center Conductor

Mating Plane

Outer Conductor

Center Conductor

Mating Plane

Outer Conductor

Mating Plane

0.207 inch (5.258 mm)

minimum

maximum

Type N Connectors

Agilent Technologies 8498A Operating and Service Manual3

Initial Inspection

Preparation For Use

Installation

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 instrument does not pass the electrical performance test, contact

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, repackaging the

instrument requires original shipping containers and materials or their

equivalents. Agilent Technologies can provide packaging materials

identical to the original materials. Refer 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, return 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.

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.

4Agilent Technologies 8498A Operating and Service Manual

Operating Information

Principles of

Operation

WARNING

Operator’s Check

Performance Tests

The attenuation is achieved by a resistive film deposition on a beryllium

oxide substrate. The high power heat is dissipated by fins in the cooling cage

that surrounds the attenuator cartridge assembly.

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.

The most accurate check of the attenuator is made using a network analyzer.

However, a simplified operator’s check of the attenuator can be made by

using either the substitution or insertion loss method.

•

If a similar attenuator of known accuracy is available, a reference 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 attenuator is working.

The best method for testing the attenuator is with an automatic network

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 Manual5

Repair

CAUTION

Service

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

cartridge assembly (16) shown in Figure 2.

Refer to Figure 2 to identify the numbered items in the following procedure.

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 assembly (16). Be careful not to let the sliding contacts (8) and

(29) and compression springs (7) and (28) slide from the contact holders

(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 attenuator fins (32), “D” ring spacers (33), and end fins

(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 screws (12). Use the end of

a toothpick to apply two small drops of Loctite 262 for each screw to the

threads in the attenuator body (16). Tighten the screws evenly to a torque

specification of 0.90 Nm (8 in-lbs).

Overtightening screws (12) beyond the specified torque may distort the card

clamp half sections and fracture the attenuator card.

6Agilent 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.

Figure 2Attenuator Exploded View

Agilent Technologies 8498A Operating and Service Manual7

Replacement Parts

To order a part listed in the replacement parts table, contact the nearest

Agilent Technologies office. Refer to “Service and Support” on pagev.

Table 3Replaceable Parts

Reference

Designation

Part Number

08498-80001

1250-0915

5040-0306

08498-20014

08498-20019

08498-20016

1460-1618

5020-3297

08498-40002

2200-0145

08498-20024

3030-0070

0470-1590

08498-20013

08498-20018

08498-60002

08498-20018

08498-20013

08498-20024

1250-0918

1250-0016

1250-0916

1250-0917

5040-0306

08498-20014

08498-20019

QTY

A/R

Description

Outer connector body Type N, female

Contact-RF connector series 7 mm-N; female

Insulator

Center conductor

Damper

Contact holder

Spring-CPRSN .054-IN-OD .258-IN-0A-LG

Contact, sliding

Attenuator housing

Screw-MACH 4-40 .438-IN-LG PAN-HD-POZI

RFI seal

Screw-SKT HD CAP 4-40 .625-IN-LG ALY STL

Loctite 262**

Inner connector body

Insulator

Attenuator cartridge assembly

Insulator

Inner connector body

RFI seal

Component-RF connector series 7 mm-N; SST

Component-RF connector series N; .75 IN

Body-RF connector series 7 mm-N straight

Contact-RF connector series 7 mm-N; male

Insulator

Center conductor

Damper

8Agilent Technologies 8498A Operating and Service Manual

Replacement Parts

Table 3Replaceable Parts (Continued)

Reference

Designation

Part Number

08498-20016

1460-1618

5020-3297

08498-40002

08498-00002

08498-40001

08498-00005

08498-00002

2190-0014

0520-0129

08498-60006

7120-7127**

QTYDescription

Contact holder

Spring-CPRSN .054-IN-OD .258-IN-0A-LG

Contact, sliding

Attenuator housing

End fin

Framed attenuator fin

D ring spacer*

End fin

Washer-LK INTL T NO. 2 .089-IN-ID

Screw-MACH 2-56 .312-IN-LG PAN-HD-POZI

Attenuator assembly

Label, identification

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

replacement.

** Not shown

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

Part

30 dB, 25W attenuator card

Attenuator body

Card clamp half section

Washer

Lock

Tuning screw

Qty.

Part Number

1GT1-2674

08498-20011

08498-20025

08498-20017

08498-20022

08498-20023

Agilent Technologies 8498A Operating and Service Manual9