Agilent Technologies 8495D Service manual

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
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.
1400 Fountaingrove Parkway
Santa Rosa, CA 95403-1799, U.S.A.
© Copyright 2000–2002 Agilent Technologies, Inc.

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 [phone]
Canada [phone]
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
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