HP 11581A User's Manual
Contents
1. Page 9 COUPLING SLEEVE CONTACTING SURFACES Figure 7 Care of APC 7 Connectors Through wear or damage the contact in the center conductor may need replacing This contact isa small four pronged collet which snaps into a recess inthecenter conductor This contactis normally held in by the spring action of the four prongs With a magnifying glass examine this contact to determine if it needs replacement DO NOT REMOVE THIS CONTACT FOR INSPECTION it may be damaged by removing The contact should be free of burrs or wear and the prongs should be equally spaced If the contactisremoved do NOT re use it itmay bedamaged by removal This contactis Amphenol part number 181 3199 and HP 1250 0907 If this contact needs replacement proceed as follows a Place the instrument so the connector faces down b Taptheconnector lightly and the contact should now protrude slightly Insert the centering pin of the Amphenol RF Division Danbury Conn 06810 COUPLING SLEEVE MN nl n 4 ITR HI SUPPORT BEAD PES j INNER CONDUCTOR CONTACT M puni jill T Ts SSS OUTER CONDUCTOR COUPLING NUT HP contact extractor part number 5060 0236 with the jaws open c Allow the jaws on the tool used to close and pull straight away from the connector without twisting d Snap in a new contact by pushing a new contact in place Figure 8 Rep2. SS 0 863 1 1 68mm MAX Daan um 0 066 ues P 5 18mm MIN 0 204 5 26mm MAX 0 207 These attenuators are not only flat in frequency but in addition their phase response is quite linear Linear phase response makes the attenua tors suitable for precision pulse work which re quires not only constant attenuation over wide bandwidth but also constant group delay OPERATOR S CHECK _ The operator s check is supplied to allow the operator to make a quick check of the instrument prior to use or if a failure is suspected THEORY m Precision silkscreening and semi automated thin film deposition are employed in the manufacture of the coaxial attenuators Silver input output and ground electrodes are silkscreened onto the dielectric substrates Then the cards are loaded into special fixtures and aligned under a micro scopetomake certain that theresistive film will be deposited in the right places Next the fixtures containing the cards are placed in a vacuum chamber and a thin film of resistive materialis evaporated onto them The process is precisely controlled Each card is tested repeatedly as the film is being deposited The finished cards do not require any hand touch up Before the cards are removed from the vacuum chamber a microscopic coating of silicon mon oxide is evaporated onto them to increase their Model 8491A Page 7 CENTER 7 1 83 0 05 mm CONDUCTOR 076 002 SMALL
3. at CONTACT PLANE TORQUE 3 4 Nem 27112 105 BENDING MOMENT 2 0 N m 1712 ft lbs Figure 5 APC 7 Connector Load Limits Model 8492A The only part recommended for customer repair is the inner conductor contact Refer to Figure 8 for instructions If anything else needs to be replaced return the attenuator to the factory see REPACKING FOR SHIPMENT and POLICY ON RETURNING ATTENUATOR FOR WARRANTY Page 8 To Connect 1 On one connector retract the coupling sleeve by turning the coupling nut counterclockwise until the sleeve and nut disengage On the other connector fully extend the coupling sleeve by turning the coupling nut clockwise To engage coupling sleeve and coupling nut when the sleeve is fully retracted press back lightly on the nut while turning it clockwise Push the connectors firmly together and thread the coupling nut of the connector with retracted sleeve over the extended sleeve Do NOT tighten the other coupling nut since this will tend to loosen the electrical connection Model 8491A To Disconnect 1 Loosen the coupling nut of the connector show ing the wider gold band WIDER BAND 2 IMPORTANT Part the connectors carefully to prevent striking the inner conductor contact Figure 6 Use of APC 7 Connectors Paris Replacement Contd NOTE If inner conductor contact is eu unit cannot be assured to retain original calibration values Model 8493A B The Mo
4. mm 67 x an 62 x 21 X x 2 3493A 1 9 16 x 1 2 dia 81938 1 9 16 x 12 dia 46x13 40 x 13 u T om Weight nei 10944 02 iq 4 oz 84918 110 9 4 oz 305 102 8493B 309 1 oz Mate with MIL C 71 and MIL C 39012 connectors Miniature SMA type Amphenol RF Division Danbury Connecticut 3 40 50 60 dB Attenuation not available in Models 8493A and 84938 3 Option numbers same as attenuation values e g Option 003 for 3 dB Option 006 for 6 dB Option 010 for 10 dB etc Option 890 Calibration Bata provides a hard copy of the transmission and reflection data as tested on a Hewlett Packard Automatic Network Analyzer Model 85428 ATTENUATOR SET 41581A FOR 8491A INCLUDES 3 6 10 20 dB VALUES 11582A FOR 84918 INCLUDES 3 6 10 20 dB VALUES 11583A FOR 8492A INCLUDES 3 6 10 20 dB VALUES ACCURACY OF INSERTION LOSS MEASUREMENTS 821 512 ACCURACY OF REFLECTION COEFFICIENT MEASUREMENTS 811 822 Attenuation ac 4 12082 12 180H7 Model LEFT RIGHT 3 dB 40 01 dB 0 06 dB 0 11 dB Number 4 I28Hz 12 188 4 12 6 2 12 18 Ghz 6 dB 0 01 dB 0 07 dB 0 11 dB 11581A 006 006 10 dB 0 01 dB 0 07 dB 0 12 dB 11582A 006 010 006 1 006 20 dB 0 01 dB 0 08 dB 0 13 dB 11583A 006 1 006 006 006 Model 8491A Page 5 OPERATOR S CHECK DESCRIPTION The attenuator is driven f
5. IN 0 064 5 28mm MIN 0 207 Figure 3 Type N Connector Dimensions OPERATION The Model 8491A B Type N connectors mate with all Type N connectors whose dimensions conform to MIL C 71B and MIL C 39012 DO NOT mate with HP 0 071 pin male connector Damage will result See Figure 3 for connector dimensions The Model 8492A has APC 7 connectors which mate with other APC 7 connectors These connectors are sexless and any APC 7 connector will mate with any other APC 7 connector Load limits for these connectors are given in Figure 5 These load limits are given by the connector manufacturer and must not be exceeded in any case See Figures 6 and 7 for instructions and recommendations concerning the use of APC 7 connectors The Model 8493A B has a male SMA jack on one end and a female SMA on the other These connec tors mate with the opposite sex SMA connectors See Figure 4 for dimensions These connectors will support the weight of the Model 8493A B but they should not be subjected to additional weight or torque With any of these attenuators do not depend upon the attenuator itself to bear any force The units the attenuator is connected to should bear their own weight and force Figure 5 gives the load limits permitted with 8492A attenuators The at tenuators are bidirectional i e the signal may be inserted from either end Eee aa Amphenol RF Division Danbury Conn 06810 8 328 1 60mm MIN
6. NOT E SEE NOTE we NWT S ack SS REF PLANE 0 91 8 63 mm 036 001 A 1 27 mm MIN a 2 54 mm MAX 050 0 100 REF PLANE MECH amp ELECTRICAL TE a In the Mated Condition the Longitudinal Force of the Coupling Mechanism Shall Exceed the Pressure Exerted by the Sealing Gasket by an amount Necessary to insure Butting of the Bodies at the REF Plane THEORY Contd Figure 4 SMA Connector Dimension stability and protect them from hostile environ ments The cards are then removed tested and loaded into their cartridges The cartridges protect the cards Do not remove the cards from their cartridges as they can be damaged easily MAINTENANCE The connectors and particularly the connector faces must be kept clean This is particularly true of the 8492A and 8493A B See Figure 7 for APC 7 cleaning instructions Performance Test The attenuators 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 available test the instrument using the proce dure in the analyzer s operating manual Parts Replacement Model 8491A B The Model 8491A B is not recom mended for repair since the cards must be mounted in cartridges to test and testing costs more than a replacement attenuator APC 7 CONNECTORS AUXILIARY EQUIPMENT FULCRUM POINT
7. OPERATING AND SERVICE MANUAL COAXIAL 8491A ATTENUATOR 8491B 8492A 8493A 8493B ATTENUATOR 11581 SET 11582A 11583A Paseo Model 8491A 8492A 8493A B 8491A B 11581A 11582A 11583A Attenuator Sets Model 11581A consists of a 3 6 10 and 20 dB Model 8491A in a box Model 11582A consists of a 3 6 10 and 20 dB Model 8491B in a box Model 11583A consists of a 3 6 10 and 20 dB Model 8492 in a Figure 1 8490 Series Coaxial Attenuators Model 8491A DESCRIPTION 8491A and B 8492A and 8493A and B attenuators are small light weight low power 50 ohm fixed coaxial attenuators Normal attenuation values are 3 6 10 20 30 40 50 and 60 dB The attenu ators cover broad frequency ranges with uniform attenuation and excellent phase linearity Power handling capacity is two watts average Each attenuator is tested with an Automatic Network Analyzer for attenuation and a plot of actual attenuation values is stamped on the metallic label attached to the body of the attenuator Model 8491 attenuators have Type N connectors one male and one female The A and B designa tions signify frequency range A for dc to 12 4 GHz and B for dc to 18 GHz Model 8492A attenu ators have precision 7 mm APC 7 connectors and cover dcto 18 GHz The Model 8493A B attenuators have SMA 3 mm connectors and cover the same frequency ranges as the Model 8491A B A
8. del 8493A B is not re commended for repair for the same reasons given for the Model 8491A B Replaceable Parts Table 2 lists the replaceable parts which are the only parts that can be replaced without access to the interior of the instrument 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 Table 2 Repiaceable Parts Description Part Number E Tray 11581A 11582A HP 11581 40001 Tray 11588A HP 9220 1292 Foam Pad top all sets HP 9220 1291 Foam Pad bottom all sets HP 9220 1297 Box Walnut all sets HP 9211 1009 Inner Conductor Contact HP 1250 0907 8492A Model 8491A 1 Keep contacting surfaces smooth and clean Irregularities and foreign particles can degrade performance 2 Protect the contacting surfaces when connector is notin use by leaving the coupling sleeve extended 3 Use lintless material and or firm bristled brush such as tooth brush for cleaning Ifa cleaning fluid is needed useisopropyl alcohol IMPORTANT Do not use aromatic or chlorinated hydrocarbons esters ethers terpenes higher alcohols ketones or ether alcohols such as benzene toluene turpen tine dioxane gasoline cellosolve acetate or car bon tetrachloride Keep exposure of the connector parts to both the cleaning fluid and its vapors as brief as possible
9. fails to meet specifications upon receipt notify the carrier and your nearest Hewlett Packard office immedi ately a list of offices is at the end of this manual Re tain the shipping carton and the padding material for the carrier s inspection The HP office will arrange for repair or replacement without waiting for the claim against the carrier to be settled REPACKAGING FOR SHIPMENT Using Original Packaging The same containers and materials used in factory packaging can be obtained through the HP offices listed at the end of this manual Using Other Packaging If it is desired to return an attenuator without a case the following general instructions should be used for repackaging with commerically available materials a Wrap attenuator in heavy paper or pastic if shipping to a Hewlett Packard office attach a tag indicating the type of service required return ad dress and model number b Use a strong shipping container c Useenough shock absorbing material 3 to 4 inch layer around the attenuator to provide a firm cushion and prevent movement inside the container d Seal the shipping carton securely e Marktheshipping carton FRAGILE to assure careful handling Policy on Returning Attenuator for Warranty Bad Contacts attenuators are returnable under warranty while Burned Out attenuators are not These terms are defined as follows Bad Contacts Attenuation is within specifi cati
10. lacing APC 7 Center Contact CERTIFICATION The Hewlett Packard Company certifies that this instrument met its published specifica tions at the time of shipment from the factory Hewlett Packard Company 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 AND ASSISTANCE This Hewlett Packard product is warranted against defects in materials and workmanship for a period of one year from the date of shipment Hewlett Packard will at its option repair or replace products which prove to be defective during the warranty period provided they are returned to Hewlett Packard Repairs necessitated by misuse of the product are not covered by this warranty NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE HEWLETT PACKARD IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES Service contracts or 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 ITALY NO CALIFORNIA San Francisco Area Hewle
11. ons at 8 GHz or higher attenuation is at least 3 to 5 dB higher than specification at de 1 kHz Burned Out Attenuation is at least 3 to 5 dB higher than specification at dc and entire rated frequency range This policy applies to all attenuators under warranty and does not affect the fact that the model 8492A is the only repairable attenuator Page 4 Modei 8491A Table 1 Specifications B491A and 8493A 4 84918 and 8493B 4 DC 10 12 4 GHZ c wae DEn S _ pc 124GHz 124 18 GHz Frequency Range _ Attenuation Accuracy 3 d8 6 46 10 dB 20 dB 30 48 40 dB 4 50 dB 4 60 dB 4 20 3 dB 10 548 O OO GH 4 ur oe wee ES e fa c pex LE cur 7 13 _ 2 Bees Lim B 125 13 12 a da Le ne p ode ris 13 ae ci 15 RET 12 13 Calibration Er es DC 4 8 12 GHz DC 4 8 12 8 GHz DC 4 8 12 18 GHz Maximum Input Power TW ave 100 W pk 2 ave 100 W pk TT avg 100 ak pe en M 73 Connectors 50 01 31 Type Ni 84818 Type Nt ELS 84938 SMA 2 Cee 8818 227165 13716 dia Tax 13 16 dia
12. rom a 50 ohm signal source at 1 kHz The output level from the attenuator 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 The SWR meter used in this check is calibrated for a square law detector and therefore the range changes and errors read in dB are twice that indicated by the meter PROCEDURE 1 Connect equipment as shown above except remove the attenuator and connect the adapters directly together 2 Set test oscillator to 0 3 Vrms at 1 kHz 3 Set SWR meter range to 2 dB expanded or for the 3 dB 6 dB and 10 dB attenuators to 10 dB expanded and adjust its bandwidth to center of adjustment range Fine tune oscillator frequency to obtain maximum meter indication Adjust the Oscillator Output to obtain the SWR meter reading in the table below 4 Connect the attenuator into the system adjust the SWR meter range switch as listed below and verify that SWR meter indicates within limits shown HP MODEL 651B HP 415E TEST OSCILLATOR i SWR METER ATTENUATOR Set SWR Meter range to 10 dB and power level to 0 0 dB for 3 dB 6 dB and 10 dB Attenuators only Figure 2 Operator s Check Page 6 Model 8491A 8 03mm MIN 9 31673 8 13mm 163mm M
13. tt Packard Italiana S P A 333 Logue Ave Casella Postale 3645 Mt View CA 94043 1 20100 Milano SO CALIFORNIA Los Angeles Area 5400 West Rosecrans Bivd e FRA N CE m Lawndale CA 90260 i Hewlett Packard France GEORGIA Quartier de Courtaboeuf 450 Interstate N Parkway Boite Postale No 6 Atlanta GA 30348 F 91401 Orsay Cedex E ILLINOIS e GERMAN FEDERAL REPUBLIC 5201 Toliview Dr Hewlett Packard GmbH Rolling Meadows IL 60008 Vertriebszentrale Frankfurt NEW JERSEY Bernerstrasse 117 W 129 Century Rd Postfach 560 140 Paramus NJ 07652 D 6000 Frankfurt 56 e AUSTRALIA e NETHERLANDS Hewlett Packard Ausiralia Ltd Hewlett Packard Benelux N V 31 41 Joseph Street Van Heuven Doedhartlaan 121 Blackburn Victoria 3130 P O Box 667 amp CANADA NL Amstelveen 1134 Hewlett Packard Canada Ltd e UNITED KINGDOM 6877 Goreway Drive Hewlett Packard Ltd Mississauga Ontario King Street Lane Canada LAV 1M8 GB Winnersb Wokingham Bers RGi1 BAR e AFRICA ASIA CENTRAL AND SOUTH AMERICA Hewlett Packard Intercontinental 3200 Hillview Avenue Palo Alto CA 94304
14. ttenu ators having the dc to 12 4 GHz frequency range are supplied with calibrations at dc 4 8 and 12 GHz Attenuators covering dc to 18 GHz are sup plied with calibrations at dc 4 8 12 and 18 GHz Models 11581A 11582A and 11583A are boxed four attenuator sets Each set consists of a 3 6 10 and 20 db attenuator and inciudes a calibration report on each attenuator The reports give the actual attenuation and reflection coefficient of each port normally at the same frequencies as those on the attenuator label The reports also include the accuracy of the calibrations and certify traceability to National Bureau of Stand ards The 11581A Attenuator Set contains 8491A attenua tors the 11582A set contains 8491B at tenuators and the 11583A set is comprised of 8492A attenuators Figure 1 page 2 shows the three models of attenuators and one boxed set The other boxed sets are similar INITIAL INSPECTION Mechanical Check If damage to the shipping carton is evident ask that the carrier s agent be present when theinstru mentis unpacked Inspect the parts for mechanical damage such as scratches or dents Also check the cushioning material for signs of severe stress Electrical Check The electrical performance should be verified as soon as possible after receipt Refer to Operator s Check or to Performance Test under MAINTE NANCE Page 3 Claim for Damage If any unit is mechanically damaged or
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