Agilent Technologies 08495-90025 User Manual

Agilent Technologies 8494/95/96G/H Attenuators

Operating and Service Manual

Agilent Part Number: 08495-90025 Printed in USA Print Date: August 2004

Supersedes: July 2002

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 propri et ary 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.

ESTRICTED RIGHTS LEGEND

Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c)(1)(i i) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 for DOD agencies, and subpara graphs (c)(1) and (c)(2) of the Commercial Computer Software Restricted Rights claus e at FAR 52.227-19 for other agencies.

Agilent Technologies, Inc. 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, U.S.A.

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What You’ll Find in This Manual…

Overview, page 1

•

• Specifications, page 6

• Installation, page 10

• Operating Instructions, page 12

• Replaceable Parts, page 15

• Service, page 16

8494/95/96G/H Operating And Service Manual iii

Warranty

Custom systems are warranted by contractual agreement between Agilent Technologies and the customer.

Certification Agilent Technologies, Inc. , certifies th at 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.

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Service and Support

Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products. 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.

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 WA RNING 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 th e like, whic h, if not cor rect ly 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.

8494/95/96G/H Operating And Service Manual v

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 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.

Safety Earth Ground

Before Applying Power

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

This is a Safety Class I product (provided with a protective earthing terminal). An uninter ru pti ble 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 matc h the availab le main power source as described in the input power configuration instructi ons in this manual. If this product is to be powered by autotransformer, make sure the common terminal is connect ed to the neutral ( grounded) side of the ac power supply.

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Overview

This manual contains operating instructions for the Agilent 8494G/H, 8495G/H, and 8496G/H attenuators. Included in the manual is information required to install and test these attenuators.

Specification Instrument specifications are indicated in Specifications, page 6. These

specifications are the performance standards or limits against which the instruments may be tested.

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 numb er prefix. The last five digits form the sequential suffix that is unique to each instrument. The contents of this manual apply to instruments with serial prefixes 2544A and above.

An instrument manufactured after the printing of this manual may have a serial prefix that is not listed above. This unlisted serial prefix indicates that the instrument is different from those documented in this manual.

Description The 8494G/H, 8495G/H, and 8496G/H are 50-ohm coaxial programmable

step-attenuators. Each attenuator is composed of three or four attenuator sections connected in cascade. Each section consists of a precision, thin-film attenuator card, a lossless thru-line, and a ganged pair of solenoid-actuated slab line transmission lines. The slab lines are flexed by the solenoid plungers to make contac t with e ither the att enuat or card or the t hru-l ine. The slab line contacts are gold plated leaf springs which ensure long life and extremely high repeatability.

8494/95/96G/H Operating And Service Manual 1

Overview

NOTE

Solenoid (K4) and associated circuitry are not available in models 8495G and 8495H.

Figure 1 Typical Four Section Attenuator Schematic Diagram

Table 1 and Table 2 on page 3 and Table 3 on page 4 show the typical

switching arrangemen t to increas e the amount of atte nuation in an 8494G/H, 8495G/H, or 8496G/H in a linear manner. To ensure specified performance, it is recomm ended that the attenuator sections that are shown in the following tables be used. With the attenuator programmed for 0 dB attenuation, the resultant attenuation is the insertion loss (residual attenuation). The 8494G/ H has a minimum sele ctable step of 1 dB, while the 8495G/H and 8496G/H have a minimum selectable step of 10 dB. The accuracy of the attenuators is within the limits given in Specifications, page 6.

• The 8494G/H are four-section attenuators with a maximum attenuation

of 11 dB.

• The 8495G/H are three-s ec ti on at te nua tor s wi th a maximum attenuation

of 70 dB.

• The 8496G/H are four-section attenuators with a maximum attenuation

of 110 dB.

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