HP 8494A User's Manual
Contents
1. OPERATING AND SERVICE MANUAL HP 8494A B HP 8495A B HP 8496A B ATTENUATORS HP Part No 08494 90008 Q HEWLETT rinte Hewiett Packard Co 1975 1977 1989 1990 1991 ia PACKARD Page 2 GENERAL INFORMATION This manual contains operating instructions including installation and test information for the HP 8494A B HP 8495A B and HP 8496A B Step Attenuators On the rear cover of this manual below the manual part number is a microfiche part number This number may be used to order a 100 x 150 mm 4 x 6 microfilm transparency of the manual The microfiche package also includes the latest Manual Changes supplement as well as all perti nent Service Notes Specification Instrument specifications are listed in Table 1 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 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 serial prefixes 2544A and above Older instruments those with serial number prefixes of 2543A and below are documented in this manual under MANUAL CHANGES on page 7 An instrument manufactured after the printing of this manual may have a serial prefix that is not listed above T2. 5201 Toilview Dr Hewlett Packard France Rolling Meadows IE 60008 Quartier de Courtaboeuf NEW JERSEY Boite Postale No 6 AFRICA ASIA CENTRAL AND W 120 Century Rd F 91401 Orsay Cedex SOUTH AMERICA Paramus Nd 07652 GERMAN FEDERAL REPUBLIC Hewlett Packard Intercontinental AUSTRALIA Hewlett Packard GmbH EUT store Hewlett Packard Australia Ltd Vertriebszentrale Frankfurt et 31 41 Joseph Street Bernerstrasse 117 Blackburn Victoria 3130 Postfach 560 140 D 6000 Frankfurt 56 4 HEWLETT BS packaro HP Manual Part No 08494 90008 HP Microfiche Part No 08494 90008 Printed in U S A
3. Table 3 lists the replaceable parts which are the only parts that can be replaced without access to the interior of the instrument Page 5 If any parts not listed in Table 3 need replacement return the instrument to Hewlett Packard To order a part listed in the replaceable parts table quote the Hewlett Packard part number indicate the quantity required and address the order to the nearest Hewlett Packard office nn SERVICE Troubleshooting Troubleshooting consists of performing the Opera tor s Check shown in Figure 1 If the instrument does not perform within limits return the instru ment to Hewlett Packard Repair The only recommended field repair is replacing the outer connector shell for the Option 001 and 003 or replacing the center contact in the APC 7 con nector For any other repair return the entire in strument to Hewlett Packard Replacing the APC 7 Connector Center Conductor Contact Through wear or damage the contact in the APC 7 center conductor may need replacement This con tact is a small four pronged contact which snaps into a recess in the center conductor With a magni fying glass examine the contact for the necessary outward spring action by carefully pushing it in DO NOT REMOVE THIS CONTACT FOR IN SPECTION It may be damaged by removal The prongs of the contact should be free from burrs or wear If the contact is removed DO NOT reuse it Order contact as Amphenol Part Number 131
4. adjustment range Fine tune oscillator frequency to obtain maximum meter indication 4 Set attenuator and SWR meter range switch as listed below and verify that SWR meter indi cates within limits shown SWR Meter i Meter Indication dB da a Antonuation A8 minimum Acta Maximum 8495A amp B 8495A8B 8495ARB 8495A88 8494A amp B 84I6ARB 8494A amp B 8495A amp B 8496A amp B 8494ARB SA96ARB 8494ARB 8496ARB 8494A amp B 8496ARB 10 0 SettoG 0 Setto 0 5 10 0 1 2 3 4 5 6 7 8 9 G 1 1 1 Adjust range by 2 dB if needed to obtain an on seale indication Figure 1 Operator s Check HP 8494A B HP 8495A B HP 8496A B Page 7 Replacing the Connector Outer Shell The connector outer shells on the Option 001 and 003 may be replaced as follows NOTE a With a 9 16 inch 1 2 inch for APC 7 thin The connector outer shell can be replaced open end wrench unscrew the outer connector body only on the Option 001 Type N female or the Option 003 APC 7 The outer b Replace the connector outer shell See shell on the Option 002 SMA cannot be Table 8 for replaceable parts numbers replaced in the field c Tighten the connector with the same wrench called out in step a Table 3 Replaceable Parts 0370 1091 Knob 1250 0907 Option 003 APC 7 Center Conductor Contact 1250 0909 Option 003 APC 7 Connector Outer Shell Assembly 1250 0914 Option 001 Type N Female Connector Outer Shell 2220 0006 Ser
5. that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of two years from the date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP 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 u
6. 129 or HP Part Number 1250 0907 If this contact needs replacement proceed as follows a Place the instrument so the connector faces down b Tap the connector lightly and the contact should now protrude slightly Insert the centering pin of the HP Contact Extractor Part No 5060 0236 with the jaws open c Allow the jaws of the tool used to close and pull straight back from the connector without twisting d Snap in a new contact by pushing it in place Test the action of the new contact by push ing it in It should spring out again when released Page 6 HP 8494A B HP 8495A B HP 8496A B OPERATOR S CHECK DESCRIPTION The attenuator is driven from a 50 ohm signal source at 1 kHz The output level from the attenu ator is detected by a narrow bandwidth voltmeter The attenuator and detector range switches are stepped together and the variations in level noted This verifies that each attenuator section is being properly switched and checks the low frequency accuracy of the attenuator NOTE The SWR meter used in this check is calibrated for a square law de tector and therefore the range changes and errors read in dB are twice that indicated by the meter OUTPUT 508 PROCEDURE 1 Connect equipment as shown above with attenuator set to 0 dB 2 Set test oscillator to 0 3 Vrms at 1 kHz 3 Set SWR meter range to 2 dB expanded or for the 8494A amp B to 10 dB expanded and adjust its bandwidth to center of
7. 4ARB 8495A amp B 8494A 84948 8495A 84958 8496A 8496B 8496A amp 8 Attenuation DC 4 DC 124112 4 18 DC 4 DC 12 4112 4 18 DC 4 DC 12 4 Selection dB GHz GHz GHz GHz GHz GHz GHz GHz 0 6 8 8 1 2 1 6 2 0 0 3 a F5 CO CO OO I OD O3 CO ND e ouh ul mu mu mu ek CD C2 op On Co No eS N MAXIMUM SWR 8495A DC to 4 GHz 1 35 8495B DC to 8 GHz 1 35 8 to 12 4 GHz 1 5 12 4 to 18 GHz 1 7 8494A 8496A DC to 4 GHz 1 5 8494B 8496B DC to 8 GHz 1 5 8 to 12 4 GHz 1 6 12 4 to 18 GHz 1 9 MAXIMUM RESIDUAL ATTENUATION ATTENUATION REPEATABILITY 8494A and 8494B 0 6 dB 0 09 dB GHz 0 01 dB typical after 5 million cycles 8495A and 8495B 0 4 dB 0 07 dB GHz 8496A and 8496B 0 6 dB 0 09 dB GHz ELECTRICAL RF POWER HANDLING CAPABILITY All models 1 watt average 100 watts peak with maximum pulse width of 10 microseconds GENERAL DIMENSIONS gt MINIMUM LIFE Models 84954 amp B gt 5 million cycles per section 130 mm 5 1 8 in long 73 mm 2 7 8 in wide 43 mm 1 11 16 in high WEIGHT Models 8494A amp B and 8496 A amp B Models 8495A amp B 159 mm 6 1 4 in long Net 312g 11 oz 73 mm 2 7 8 in wide Models 8494A amp B and 8496A amp B 43 mm 1 11 16 in high Net 425g 15 oz 1 Dimensions are for general information only If dimensions are required for building special enclosures contact your HP field engineer 2Weight and width of the
8. ews for both bases 4 40 x 7 8 in Fillister head 7120 0543 Label 0 110 dB for 84964 amp B 7120 3376 Label 0 70 dB for 8495A amp B 7120 4525 Label 0 11 dB for 8494A amp B 08495 20021 Base for 8495A amp B 08496 20008 Base for 8494A amp B and 8496A amp B NOTE Option 002 SMA connectors are not replaceable without access to the interior of the instrument If these connectors are damaged return the instrument to Hewlett Packard MANUAL CHANGES a In Table 1 Specifications change the ATTEN This section contains information for adapting this UATION REPEATABILITY to 0 03 dB typical manual to older instruments If your instrument s after 1 million cycles serial number prefix is not listed on page 2 of this manual and the serial number prefix on the instru b In Table 1 Specifications change the MINI ment is 2543A or lower you may document your MUM LIFE to gt 1 million steps or switchings per instrument by following the instructions below If section your instrument has a serial number prefix higher than is listed in this manual it may be documented c On the WARRANTY page change the war in a separate MANUAL CHANGES supplement ranted period from two years to one year If you have an older instrument one with a serial number prefix of 2543A or lower you must make the following changes to this manual in order for this manual to apply to your instrument CERTIFICATION Hewlett Packard Company certifies
9. his unlisted serial prefix indicates that the instrument is different from those docu mented in this manual The manual for this instru ment is supplied with a Manual Change supplement containing change information that documents the differences Description HP 8494A B HP 8495A B and HP 8496A B are 50 chm coaxial Step Attenuators The attenuation can be varied in 1 dB steps for the HP 8494A B or 10 dB steps for the HP 8495A B or HP 8496A B by rotating the knob The attenuation shown on the control knob is the additional attenuation added in HP 8494A B 8495A B 8496A B the signal path over the insertion loss of the atten uator in the 0 dB position Accuracy is within the limits given in Table 1 The HP 8494A B are four section attenuators ranging from 0 dB to 11 dB in 1 dB steps The HP 8495A B are three section atten uators with a range of 0 dB to 70 dB in 10 dB steps while the HP 8496A B units range from 0 dB to 110 dB in 10 dB steps The attenuator sections are 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 attenua tor card or the thru line The edge line contacts are gold plated leaf springs which ensure long life and high repeatability Low torque cams flex the edge lines Table 2 shows the switching arrangements Warranty Attenuators are warra
10. instrument varies with the option selected due to the type of connectors Page 4 HP 8494A B HP 8495A B HP 8496A B Table 2 Attenuator Switching Order 8494A amp B Attenuator Sections 3da r OO CO 3 O ON G ND ri bet ii the instrument has been checked mechanically and electrically A procedure for checking electrical performance is given under Operator s Check aiso see PERFORMANCE TESTS If the contents of the shipment are incomplete if there is mechani cal damage or defect or if the instrument does not pass the electrical performance test notify the nearest Hewlett Packard office If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping materials for the carrier s inspection The HP office will arrange for repair or replacement without waiting for claim settlement Mating Connectors Mating connectors used with the Option 001 must be Type N male connectors which comply with U S military standard MIL C 39012 For Option 002 male SMA connectors must be used For Option 003 APC 7 mating connectors must be used Operating Environment The operating environment of the instruments should be within the following limits Temperature 0 to 55 C Humidity lt 95 relative Altitude lt 4600 metres 15 000 feet Installation Precaution When installing the instrument make
11. ll serial number HP 8494A B HP 8495A B HP 84964 B OPERATING INSTRUCTIONS CAUTION Do not apply power greater than 1 watt average or 100 watts peak with a maxi mum pulse width of 10 microseconds If these limits are exceeded the Attenuators may be damaged After the instrument is connected the attenuation may be selected Turn counterclockwise to increase attenuation or clockwise to decrease attenuation Either connector may be used as the input or output CAUTION Do not attempt to force the switch be tween 0 and the highest value position as there is a stop between these switch positions OPERATOR S CHECK The Operator s Check Figure 1 is supplied to allow the operator to make a quick check of the instrument prior to use or if a failure is suspected PERFORMANCE TESTS The instrument can be tested to the accuracy of the specifications in Table 1 with an Automatic Network Analyzer or equivalent equipment of suit able accuracy If an Automatic Network Analyzer is available test the instrument using the proce dures in the analyzer s operating manual ADJUSTMENTS This instrument has no adjustments and should not be opened If defective return the instrument to the nearest Hewlett Packard office for repair REPLACEABLE PARTS CAUTION Due to special fixtures necessary for assem bly do NOT attempt to replace any parts not listed in Table 3 If the instrument is opened the warranty is void
12. nauthorized 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 HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP 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 Hewlett Packard products HEWLETT PACKARD SERVICE OFFICES To obtain servicing information contact the nearest Hewlett Packard Sales and Service Office in HP Catalog or contact the nearest regional office listed below UNITED STATES CANADA NETHERLANDS NO CALIFORNIA San Francisco Area Hewlett Packard Canada Ltd Hewlett Packard Benelux N V 333 Logue Ave 6877 Goreway Drive Van Heuven Doedhartlaan 121 Mt View CA 94048 Mississauga Ontario P 0 Box 667 SO CALIFORNIA Los Angeles Area Canada L4V 1M8 NL Amstelveen 1134 DR PE Center ITALY 1421 S M attan Ave A Fullerton CA 92631 jabea ete LS UNITED KINGDOM GEORGIA eee Cua Hewlett Packard Ltd 450 Interstate N Parkway Sul Naviglio MD King Street Lane Atlanta GA 30348 g GB Winnersb Wokingham ILLINOIS FRANCE Berks RG11 5AR
13. nted only when they are operated within their specifications especially power handling capability Any attenuators _ returned to Hewlett Packard under warranty will be examined carefully to determine if failure was due to improper use Be sure to observe the following cautions CAUTION Do not exceed the RF power rating of 1W average or 100W peak with a maximum pulse width of 10 us Do not connect an attenuator RF input or output connector to greater than 7 Vdc If the attenuator must be connected to a device witha potential greater than 7 Vdc use a block ing capacitor Options Each instrument is specified with an option number which denotes the input and output connec tors configuration The options are as follows 001 Both connectors Type N female jack 002 Both connectors SMA female jack 003 Both connectors APC 7 INSTALLATION Initial Inspection 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 HP 8494A B HP 8495A B HP 8496A B Page3 Table 1 Specifications FREQUENCY RANGE ATTENUATION 8494A 8495A and 8496A DC to 4 GHz 8494A and 8494B 0 dB to 11 dB in 1 dB steps 8494B 8495B and 8496B DC to 18 GHz 8495A and 8495B 0 dB to 70 dB in 10 dB steps 8496A and 8496B 0 dB to 110 dB in 10 dB steps fe nal Attenuation Accuracy dB Referenced from 0 dB 849
14. sure that the connectors do not support weight or bear 8495A amp B Attenuator Sections CASARE to oe 8496A amp B Attenuator Sections torque The preferred procedure is to set up all equipment in position before connecting the instru ment Either connector may be used as the input or output connector Installation Instructions The attenuators may be installed with or without the base The base is removed by unscrewing the two fillister head screws from the bottom of the base The attenuator may be mounted without the base by inserting two 4 40 screws into the screw holes in the bottom of the attenuator Removing the base and mounting the attenuator does not affect the performance of the attenuator Storage and Shipment Environment The instrument should be stored in a clean dry envionment The following environ mental limits apply to both storage and shipment Temperature 40 C to 75 C Humidity lt 95 relative Altitude lt 7600 metres 25 000 feet Original Packaging Containers and materials identi cal to those used in factory packaging are available through Hewlett Packard offices If the instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and full serial number Also mark the container FRAGILE to assure care ful handling In any correspondence refer to the in strumentby model number and fu
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