Agilent Technologies 8495D Manuale di servizio

Agilent Technologies

8495D/K Attenuators

Operating and Service

Manual

Agilent Part Number: 08495-90027

Printed in USA

Print Date: July 2002

Supersedes: April 2002

ii 8495D/K Attenuators 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.

1400 Fountaingrove Parkway

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

8495D/K Attenuators Operating And Service Manual iii

What You’ll Find in This Manual…

•“Instrument Deﬁnition” on page 1

•“Description” on page 2

•“Speciﬁcations” on page 6

•“Installation” on page 8

•“Operating Instructions” on page 9

•“Operator’s Check” on page 10

•“Replaceable Parts” on page 12

iv 8495D/K Attenuators Operating And Service Manual

Warranty

Custom systems are warranted by contractual agreement between Agilent

Technologies and the customer.

Certiﬁcation Agilent Technologies, Inc., 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.

Documentation

Warranty THE MATERIAL CONTAINED IN THIS DOCUMENT IS

PROVIDED "AS IS," AND IS SUBJECT TO BEING CHANGED,

WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO

THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW,

AGILENT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS

OR IMPLIED WITH REGARD TO THIS MANUAL AND ANY

INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT

LIMITED TO THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE. AGILENT SHALL NOT BE LIABLE FOR ERRORS

OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN

CONNECTION WITH THE FURNISHING, USE, OR

PERFORMANCE OF THIS DOCUMENT OR ANY

INFORMATION CONTAINED HEREIN. SHOULD AGILENT

AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT

WITH WARRANTY TERMS COVERING THE MATERIAL IN

THIS DOCUMENT THAT CONFLICT WITH THESE TERMS,

THE WARRANTY TERMS IN THE SEPARATE AGREEMENT

WILL CONTROL.

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).

8495D/K Attenuators Operating And Service Manual v

Service and Support

Any adjustment, maintenance, or repair of this product must be performed

by qualiﬁed personnel. Contact your customer engineer through your local

Agilent Technologies Service Center. You can ﬁnd a list of local service

representatives on the Web at:

http://www.agilent.com/find/assist

Click on “Contact Us” and select your country.

If you do not have access to the Internet, one of these centers can direct you

to your nearest Agilent Technologies representative.

United States (800) 403-0801

Canada (877) 429-9969

Europe (41 22) 780.6111 (Switzerland)

(33 1) 69 82 66 66 (France)

(49 7031) 464-6222 (Germany)

(44 188) 9696622 (Great Britain)

Japan 0120-32-0119

Latin America (11) 7297-3700 (Brazil)

Australia/New

Zealand 1-800-802-540 (Australia)

0800-738-378 (New Zealand)

Asia-Paciﬁc 080-047-669

vi 8495D/K Attenuators 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).

8495D/K Attenuators Operating And Service Manual vii

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.

This ISM device complies with Canadian ICES-001.

Cet appareil ISM est conforme a la norme NMB du Canada.

This symbol indicates that the power line switch is ON.

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

viii 8495D/K Attenuators Operating And Service Manual

8495D/K Attenuators Operating And Service Manual 1

Instrument Deﬁnition

This manual contains installation, operation, and test information for the

8495D and 8495K.

Instruments Covered by

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

ﬁrst four digits and letter comprise the serial number preﬁx. The last ﬁve

digits form the sequential sufﬁx that is unique to each instrument. The

contents of this manual apply to instruments with the following serial

preﬁxes:

An attenuator manufactured after the printing of this manual may have a

serial preﬁx that is not listed above. This unlisted serial preﬁx indicates that

the attenuator is different from those documented in this manual.

8495D: 1711A 2406A 2508A 2544A 2852A 3308A

8495K: 1711A 2406A 2508A 2544A 2808A

28495D/K Attenuators Operating And Service Manual

Description

The Agilent 8495D and 8495K are 50-ohm, dc to 26.5 GHz, 0-70 dB (in

10 dB steps), coaxial attenuators with APC 3.5 connectors. Each attenuator

is made up of four attenuation sections connected in cascade. Each section

consists of a precision thin-ﬁlm attenuator card, a lossless thru-line, and a

ganged pair of edge line transmission lines. The edge lines are ﬂexed to

make contact with either the attenuator card or the thru-line. The edge line

contacts are gold-plated leaf springs which ensure long life and high

repeatability. In the 8495D, the edge line controls are ﬂexed by low-torque

cams. In the 8495K, the edge line controls are ﬂexed by solenoid plungers

(see Figure 1).

Table 1 on page 3 shows the switching arrangement required to increase the

amount of attenuation from 0 to 70 dB in 10 dB steps. In the 8495K, to

ensure speciﬁed performance, it is recommended that the attenuator sections

shown in the table below be used. Also, when changing attenuation, it is

good practice to insert the required sections before deletion of the unneeded

sections. With the attenuator set for 0 dB attenuation, only the insertion loss

(residual attenuation) remains.

Figure 1 8495K Programmable Four-Section Attenuator Schematic Diagram

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