8498A Fixed Attenuator Operating and Service Manual
Contents
1. 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 Certification Warranty 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 A2. manual for important information The laser radiation symbol is marked on products that have a laser output This symbol indicates that the instrument requires alternating current ac input 4 This symbol indicates hazardous voltages NI ce 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 Q The CSA mark is a registered trademark of the Canadian Standards Association e 1SM1 A This text indicates that the instrument is an Industrial S cientific 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 Earth Ground Before Applying Power Safety and Regulatory Information 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
3. pide Add 4 Operating Information iius deen o aed soos i Pees EORR Ex pop s 3 Principles pt Operation Leia bu seien ena ergo 1 E lacta ren 5 Operators CHECK Liisenebe rere Re a eke dowd EUER Rd de de dd 3 Peroni aie Tese ods ieee ete nh obe boh e e RSS 5 MOLIS Scie ed ede Unde inopem dagli dd dedi didis 6 0j e 6 TroublesosnE Loose ad denda OX ERE de d ROCA d ao Rr b ou T Figure 2 Attenuator Exploded View 2 celles T Replacement Parte eL cus durae abd da dO dace sda de dac du 8 l bie 3 Replaceable FUN oio smacsses dacesekinbeerqd std aad 8 Table 4 Attenuator Cartridge Assembly Parts Item 16 in Figure 2 9 Agilent Technologies 8498A Operating and Service Manual Contents 1 Attenuator Overview Safety Considerations WARNING General Information The 8498A is a 30 dB 30 W 25 W between 35 xC 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 rem
4. Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 LN Established 1981 XE Agilent Technologies 8498A Fixed Attenuator Operating and Service Manual The contents of this manual apply to instruments with serial number prefix US91 and above EE 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
5. SCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Agilent Technologies 8498 Operating and Service Manual iii 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 page v iv Agilent 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 www agilent com find assist United States tel 1 800 452 4844 Latin America tel 305 269 7500 fax 305 269 7599 Canada Europe tel 1877 894 4414 tel 31 20 547 2323 fax 905 282 6495 fax 431 20 547 2390 New Zealand tel 0 800 738 378 fax 64 4 495 8950 J apan tel 81 426 56 7832 fax 81 426 56 7840 Australia tel 1 800 629 485 fax 61 3 9210 5947 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 Philippine
6. aining 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 page v 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 Manual 1 Table 1 Table 2 Specifications Specifications Instrument sp
7. de 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 Ifa 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 Ma
8. ecifications are listed in Table 1 These specifications are the performance standards or limits against which the attenuator may be tested 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 1 25 0 11 8 0 t012 4 GHz 1 30 0 13 12 4 to 18 0 GHz Power Range Upto25 W CW Maximum Input Power Average 30 W at 0 to 435 C 25 W at 435 C up to 55 C Peak 500 W dc to lt 5 8 GHz 125 W gt 5 8 GHz upto 18 0 GHz Energy per pulse 500 W us Connectors Type N male and female 1 For pulses greater than 30W the maximum average power Pa is limited by the energy per pulse E in W us according to Pa 230 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 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 Operating Environment Storage and Shipping Environment Mating Connectors Specifications The operating environment of the attenuator should be within the following limitations iow conii 0 to 55 C Humidity uai tete er
9. en lt 95 relative at 40 C Altitude ite eee eter oett ede 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 laudc c ET 40 to 75 C Hutnidity s eeepc beers inb cette lt 95 relative at 40 C Altitude ient cone rales 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 Connector Type N Female Connector Center Conductor _ Mating Plane Outer Conductor Mating Plane Center Conductor ba Mating Plane Outer Conductor Mating Plane HX 0 207 inch 5 258 mm 0 207 inch 5 258 mm minimum maximum Figure 1 Type N Connectors Agilent Technologies 8498A Operating and Service Manual 3 Initial Inspection Preparation For Use Installation Installation 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 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 of
10. fice 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 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 4 Agilent Technologies 8498A Operating and Service Manual Principles of Operation WARNING Operator s Check Performance Tests Operating Information Operating Information 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 oxi
11. gilent 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 DI
12. nual 5 Repair CAUTION Service 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 Remove the three screws 36 and lock washers 35 from both ends of the attenuator assembly Remove the end fins 31 and 34 the RFI seals 11 and 19 spacers 33 and the framed attenuator fins 32 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 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 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 assembl
13. ring 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 7120 7127 1 Label identification NOTE Some attenuators may have two spacers instead of one 08498 00005 is the direct replacement Not shown 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
14. s 632 8426802 632 8426809 1 800 16510170 PLDT 1 800 16510288 PLDT Subscriber Only Subscriber Only Thailand 088 226 008 outside Bangkok 66 1 661 3714 662 661 3999 within Bangkok Hong Kong 800 930 871 852 2506 9233 Taiwan 0800 047 866 886 2 25456723 People s Republic 800 810 0189 preferred 10800 650 0121 of China 10800 650 0021 India 1 600 11 2929 000 800 650 1101 Agilent Technologies 8498 Operating and Service Manual v 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
15. t on page v Replaceable Parts aren Part Number QTY Description 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 0470 1590 AIR Loctite 262 14 08498 20013 2 nner connector body 15 08498 20018 2 nsulator 16 08498 60002 1 Attenuator cartridge assembly 17 08498 20018 nsulator 18 08498 20013 nner 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 Table 4 Replacement Parts Replaceable Parts Continued Reference Designation Part Number QTY Description 27 08498 20016 Contact holder 28 1460 1618 Sp
16. 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 Italics Instrument Display Keycap Softkey User Entry Path Name Computer Display Typeface Conventions 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 sample txt 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 b
17. utton 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 llc UOu ii b riri She T ETT iii E T du Sod o aded d AAT S ATTEN ET durd RR ii PRESS E Lascaris v P dob x ebbe d d abb aede des iv SEP aid SUE Li acp Soi ng Re eee DARA HE UR V Safety and Regulatory Information 0 e eee eee eee vi palette Dsrthe PHOUHE foe reeds tented eo EYE RA EAE do wn vii Before Applying DOWGf occa dk cds heed phe deawoadtwdeaee xd ded n dus vii Tupetace 4 ORVenbatia soe vico ERROR ace ee RRS viii Crenstal IPOD Ot 2 22poend pde ea dade E pde ade AT T 1 Attenuator OVerVIBW lt 2 2acc8eecee sees cae coed thee eden IERES 1 Barely COnsSIdBraEOBS is osse pac ke AE E Nn SOROR ROC ACER EREN 1 SPCCHICMIONS izzecksg r ER EN ee eee SERGE ERE ORES DR A WR NUR RS 2 Table f Spec NONE 22 catia cde rane ace erdabeadeerheradwndss 2 Table 2 Supplemental Characteristics 00 ccc eee 2 Operating EREHOQUEME ann es ev Eo niert RUE v REC LAO X 3 Storage and Shipping Environment sescsscrescrererersres 3 Mating Connectors 2 cw dcnicavi revs n e espe eee new ewes ae 3 TIsHe f Type NOLOBNEDIDES LLENO ROC OR RO RZ RAED 3 ISTH Sisoudpbo dit det aded died addu dcn d Re beacons 4 Minal IASPECHION uu senes exe RR e UR aber vx Pe gebs 4 Preparation POP Use vus ccosuad ceded kispe sqqdd qe
18. y 16 Position the RFI seals 11 and 19 and install end fins 31 and 34 with screws 36 and lock washers 35 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 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 Figure 2 Attenuator Exploded View Agilent Technologies 8498A Operating and Service Manual 7 Table 3 Replacement Parts Replacement Parts To order a part listed in the replacement parts table contact the nearest Agilent Technologies office Refer to Service and Suppor
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