772D and 773D Directional Couplers Operating and Service Manual
Contents
1. ARE BUYER S SOLE AND EXCLUSIVE REMEDIES AGILENT SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Product maintenance agreements and other customer assistance agreements are available for Agilent products For assistance call your local Agilent Sales and Service Office refer to Service and Support on page v This documentation supports a product that previously shipped under the Hewlett Packard company brand name The brand name has now been changed to Agilent Technologies The two products are functionally identical only our name has changed The document still includes references to H ewlett Packard products some of which have been transitioned to Agilent Technologies iv 772D 773D Operating and Service Manual 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 Service Center Online assistance www agilent com find assist United States tel 1 800 452 4844 Latin America te 305 269 7500 fax 305 269 7599 New Zealand tel 0 800 738 378 fax 64 4 495 8950 J apan td 81 426 56 7832 fax 81 426 56 7840 Malaysia ta 1 800 828 848 fax 1 800 801 664 Philippines tel 632 8426802 tel PLDT subscriber only 1 800 16510170 fax 632 842. 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 Copyright Agilent Technologies 1994 1998 2001 ii 772D 773D 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 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 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 will at its option either repair or replace products that prove to be defective Warranty service for products installed by Agilent and certain other products designated by Agilent will be performed at Buyer s facility at no charge within Agilent service travel areas Outside Agilent service travel areas warranty service wil
3. 14 16 18 FREQUENCY IN GHz Figure 3 Directivity Calculating 772D Error Analysis has shown the typical measurement error of the 772D to be BoeASBISECIST where E error of swept frequency measurement A directivity of 772D B effective source match coupler directivity C source match I reflection coefficient of unknown 772D 773D Operating and Service Manual 15 Specifications By using various techniques such as fixed frequency measurements calibrating out the source match error by taking an average of the open and short circuit readings or by running a calibration grid this error can be reduced to Ep At Gr These two equations are graphed as follows 0 Reflection Ty 1 Figure 5 772D Error 2 0 to 12 4 GHz 0 Reflection TX 1 Figure 6 772D Error 12 4 to 18 0 GHz 16 772D 773D Operating and Service Manual Initial Inspection Storage and Shipment 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 Procedures for checking electrical performance are given under Performance Tests If the contents are incomplete if there is mechanical damage or defect or if the instrument does not pass the electrical performa
4. 26809 fax PLDT subscriber only 1 800 16510288 Taiwan tel 0800 047 866 fax 886 2 25456723 People s Republic of China te preferred 800 810 0189 td alternate 10800 650 0021 fax 10800 650 0121 772D 773D 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 manual for important information 4 This symbol indicates hazardous voltages NI The laser radiation symbol is marked on products that have a laser output Th
5. Directional couplers in their auxiliary arms sample the power flowing in one direction in the mainline and ignore power flowing in the opposite direction They can be used for measurement purposes or for power leveling The coupling in the 773D changes the same as the coupling variation of the input coupler in the 772D This property may be used to cancel out the coupling variation of the 772D in a reflectometer setup by using the 773D to change the coupling for tracking purposes Warranty The directional couplers are warranted and certified as indicated in the front matter of this manual 772D 773D Operating and Service Manual 11 Specifications Specifications The specifications given below are the performance standards or limits against which the directional couplers are tested Unless otherwise stated the specifications apply to both directional couplers Table 1 Specifications Characteristics and Conditions Limits Comments Frequency Range 2 0to 18 GHz Maximum Directivity For the 772D this specification applies to the test port only 2 to 12 4 GHz 30 dB Input port directivity is 24 dB 2 to 18 GHz 12 4 to 18 GHz 21 dB Maximum Primary Line SWR 50 Q nominal impedance 772D 2 to 12 4 GHz 1 28 12 4 to 18 GHz 1 40 773D 2 to 12 4 GHz 1 21 12 4 to 18 GHz 1 27 Maximum Auxiliary Line SWR Established with a best fit line through the coupling curve 2 to 12 4 GHz 1 3 12 4 to 18 GHz 13 Nom
6. RE Agilent Technologies Agilent Technologies 772D and 773D Directional Couplers Operating and Service Manual Serial Numbers This instrument has a two part serial number The first four digits and the letter comprise the serial number prefix The last five digits form a sequential suffix which is unique to each instrument The contents of this manual apply directly to instruments having the serial number prefix 2838 and above Part number 00772 90001 Printed in USA July 2001 Supersedes June 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 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 assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Agilent 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
7. ct the output signal from the TEST PORT connector to the test setup Connect the incident power indicating device to the INCIDENT port The power from this port is attenuated approximately 20 dB from that flowing on the mainline in a forward direction from INPUT to TEST PORT Connect the reflected power indicating device to the REFLECTED port Coupler power from this port will be attenuated approximately 20 dB from the power reflected by a device under test connected to the TEST PORT Mainline power flowing from the INPUT port to the REFLECTED port will be attenuated an additional amount equal to the directivity 18 772D 773D Operating and Service Manual Operating Information Using the 773D Directional Coupler Figure 8 773D Directional Coupler CAUTION Maximum power input is 50 W CW or 250 W peak Greater power may damage the 773D 1 Connect the signal from the signal source to the INPUT connector 2 Connect the output signal from OUTPUT to the test setup 3 Connectthe coupled signal from the COUPLED port to the detector The power from this port is attenuated approximately 20 dB from that flowing on the mainline in a forward direction from INPUT to OUTPUT ports Any voltage reflected from equipment connected to the OUTPUT port will be attenuated an additional amount equal to the directivity 772D 773D Operating and Service Manual 19 Performance Tests Performance Tests The following procedures test t
8. e 1 dB div Reference level 0 dBm 2 Perform short open calibrations according to the directions for your network analyzer The calibration should be automatically stored in Channel 1 memory 20 772D 773D Operating and Service Manual Performance Tests 3 On the 8757A press M MEM on Channel 1 display keys On equivalent network analyzers press the key sequence that will remove calibration and frequency response errors from further measurements according to the equation Es Ep A Dres Refer to Calculating 772D Error under Specifications in this manual P8757A ETWORK ANALYZER H HP8350B N SWEEP_OSCILLATOR HP 8757A SYSTEM INTERFACE HP 83592B RF PLUG IN Sliding Load HP 905A Termination HP 909F HP773D DIRECTIONAL ER COUPLER 3 757A WORK ANALYZER HP8 NET HP83508 SWEEP OSCILLATOR HP 8757A SYSTEM INTERFACE HP 835928 RF PLUG IN Sliding Load HP 905A Termination HP 909F HP11664A DETECTOR HP772D DIRECTIONAL COUPLER 5 11664A TECTOR Figure9 772D 773D Performance Test Setup 772D 773D Operating and Service Manual 21 Directivity Test NOTE Performance Tests This test assumes that setup and calibration have already been completed To check that the couplers meet the directivity specification in Table 1 perform the following steps The accuracy of the test system must be added to the directivity specificat
9. gth 186 mm 7 3 in Width 108 mm 4 3 in Height 30 mm 1 2 in 772D 773D Operating and Service Manual 13 Specifications Supplemental Characteristics Supplemental characteristics are not specifications that is they are not covered by the certification and warranty at the beginning of this manual They are typical or nominal characteristics included as additional information for the user Characteristics Frequency 772D 773D Minimum Directivity 0 1 to 2 0 GHz 39 dB 39 dB 12 4 to 20 GHz 20 dB 21 dB Maximum Primary Line SWR 0 1 to 2 0 GHz 1 05 1 29 18 to 20 GHz 1 29 1 16 Maximum Auxiliary Line SWR 0 1 to 2 0 GHz 1 08 1 07 18 to 20 GHz 1 17 1 17 Primary Line Residual Loss 0 1 to 2 0 GHz lt 0 26 dB lt 0 15 dB 18 to 20 GHz 1 3 dB 0 6 dB Effective Source Match Frequency 772D 773D 0 1 to 2 GHz 1 06 1 05 2 to 12 4 GHz 1 13 1 12 2 4 GHz to 18 GHz 1 18 1 15 18 to 20 GHz 1 32 1 28 14 772D 773D Operating and Service Manual Specifications Voltage Incident on 772D Test Port and 773D Input Figure 2 depicts the typical coupling curve of the 772D and 773D FREQUENCY IN GHz IRSE fel NISI 19 21 23 25 27 29 31 33 35 37 39 41 43 COUPLING IN dB Figure 2 Voltage Incident on 772D Test Port and 773D Input Directivity The following graph depicts the 772D 773D typical changes in directivity over the frequency range DIRECTIVITY IN dB 0 2 4 6 8 10 12
10. gulatory Information viii 772D 773D Operating and Service Manual ING Crete cgay Stare sata ose e tuae E emus e aera ar UN ME Re ii Warranty araa e esca ae ete ace e Pe ee AAEN iii Certification oven Echt a eaa opted Sea eea ae iii Warranty dee ter e eas e tat ee EAT ER RC E RR TREE idu scs ii INSSISTANCE 5 o aatia ede ERE Sn Need Wakes be ieget d etes iv Service and Support ossucsn slap Ae ERE RAE NER dae V Safety and Regulatory Information 0 0 0000 eee eee vi Safety Earth Ground i spp bear ed eee estas eh ed vii Before Applying Power llle vii Description zoo e eee hae ee ee ey a a 11 Figure 1 772D and 773D Directional Couplers su 11 772D Dual Directional Coupler sees 11 TID Directional Coupler 2 0 0 0 0 eee eee ee eee 11 Specifications rasa uber LA aude Rae a eene e Bas 12 Table 1 Specifications ccce 12 Figure 2 Voltage Incident on 772D Test Port and 773D Input 15 Figure 3 Directivity ccce 15 Figure 4 772D Error 0 1 to 2 0 GHz lees 16 Figure 5 772D Error 2 0 to 12 4 GHz lesse 16 Figure 6 772D Error 12 4 to 18 0 GHz sees 16 Installation 45 doves iex ebur dote eR EM eta 17 Initial Inspection 2 o6 odes pda ha Een ou eugene ee das 17 Storage and Shipment 0 0 0 eee eee eee eee 17 Operating Information 0 0 0 0 eee eee eh 18 Using the 772D Dual Directional Coupler 18 F
11. he 772D and 773D electrical performance specified in Table 1 All tests can be performed without access to the interior of the instrument Table 2 Recommended Test Equipment Set Up and Calibration Instrument Critical Specifications Suggested Agilent Model Use 8350B main frame with PT 83592B RF plug in 0 01 Sweep oscillator CW and swept frequency signal in 0 01 GHz to 40 GHz range to 20 GHz Scalar network analyzer Swept frequency transmission 8757A PT and reflection measurements from 0 01 to 60 GHz AC DC detection capability Detectors 2 Range 60dBmto 16dBm 116644 PT Fixed termination Range dc to 6 GHz 909F PT Sliding load Range 1 8 to 18 GHz 905A PT Coaxial short ates with type N male 85054 60026 PT ates with type N female 85054 60025 ates with APC 7 85050 80007 Coaxial open ates with type N male 85054 60028 PT ates with type N female 85054 60027 ates with APC 7 85050 80010 1 P Performance test T Troubleshooting To account for frequency response errors and calibrate your test setup perform the following procedure Refer to Figure 9 for the test setup used for the performance tests 1 Connect your 772D or 773D to the test equipment as shown in Figure 9 Set the test equipment controls as follows Sweep Oscillator Network Analyzer RF Plug In Start marker 2 GHz Channel 1 ALC mode internal Stop marker 18 GHZ Display A R RF ON Modulation ON Scal
12. igure 7 772D Dual Direction Coupler lesse 18 Using the 773D Directional Coupler 0 005 19 Figure 8 773D Directional Coupler cee 19 Performance Tests 0 0 ccc cece ence eens 20 Table 2 Recommended Test Equipment 00 0000 eee 20 Set Up and Calibration 0 0 cece ee eee 20 Figure 9 772D 773D Performance Test Setup 0000 000s 21 Directivity Test oua etu veu teh e ace tae aee ete da 22 Table 3 Correction for Element Reflection of the 905A 22 Service Instructions seras a 000 c ese ence ee ehm uh 23 Connectors o ie ER EU SES Ee a Cede e CR A SUR 23 Figure 10 Use and Care of APC 7 Connectors 0 04 23 772D 773D Operating and Service Manual ix x 772D 773D Operating and Service Manual Description Description Figure 1 772D Dual Directional Coupler 773D Directional Coupler 772D and 773D Directional Couplers The 772D dual directional coupler is a four port passive device Directional couplers sample power flowing in one direction and ignore power flowing in the opposite direction Two couplers are incorporated in the 772D so that power flowing in either direction can be sampled Such a system is usually called a reflectometer In a reflectometer the incident power flowing into the setup and the reflected power from the device under test are compared The 773D directional coupler is a three port passive device
13. inal Coupling 2 0 to 18 GHz 20 1 dB Maximum Coupling Variation Test port to incident 772D 2 0 to 18 GHz 1dB 773D 2 0 to 18 GHz 1 dB Tracking lt 0 7 dB With 772D TEST PORT shorted and not including source match ripple Refers to the relative tracking of the auxiliary arms auxiliary arms do not necessarily track in absolute power Typical relative tracking between 772D and 713D lt 0 7 dB Primary Line Residual Loss 772D lt 1 5 dB 773D 90 dB Maximum Power Input 50 W 47 dBm average 250 W 54 dBm peak 12 772D 773D Operating and Service Manual Table 1 Specifications Continued Specifications Characteristics and Conditions Limits Comments Connectors MIL C 39012 772D Input Type N female Incident Type N female Reflected Type N female Test port APC 7 773D Input APC 7 Coupled Type N female Output APC 7 Offset by 2 5 degrees by design Option 001 Type N female Onall ports on both 772D and 773D 773D only Option 002 Input Type N male Coupled Type N female Output Type N female Option 010 Input Type N female Coupled Type N female Output Type N male Operating Environment Temperature range 0 to 455 C Humidity lt 95 relative Maximum altitude 4570 meters 15 000 feet Net Weight 772D 2 6 kg 5 72 Ib 773D 0 8 kg 1 76 Ib Dimensions 772D Length 391 mm 15 4 in Width 133 mm 5 3 in Height 43 mm 1 7 in 773D Len
14. ion in Table 1 1 2 Connect the fixed termination as shown in Figure 9 Set the network analyzer Channel 1 reference level to 30 dBm Verify that directivity is within specification from 2 GHz through 18 GHz Directivity 2 to 12 4 GHZ 0 ce eee lt 30 dB Directivity 12 4 to 18 GHz 2 2 ee eee lt 27dB Connect the sliding load as shown in Figure 9 At frequencies of interest phase move the load element Read the peaks and troughs and calculate the difference in dB Agp Find the appropriate correction factor Dcgp from Table 3 Table 3 Correction for Element Reflection of the 905A ADap Degp ADap Degp ADap Degp 1 0 0 40 3 6 1 60 6 0 2 40 11 0 50 3 9 1 70 6 5 2 60 14 0 60 40 1 70 7 0 2 80 1 6 0 70 41 1 80 1 5 2 90 1 8 0 80 42 1 80 8 0 3 10 2 0 0 90 4 3 1 85 8 5 3 20 2 2 1 00 44 1 90 9 0 3 30 25 1 10 45 1 90 95 3 50 2 7 1 20 4 6 2 00 10 0 3 60 3 0 1 30 47 2 00 12 0 4 00 3 1 1 40 49 2 10 14 0 4 30 32 1 40 5 0 2 10 16 0 4 60 3 4 1 50 5 5 2 30 22 772D 773D Operating and Service Manual Service Instructions Service Instructions Connectors For instruction on connecting and care of your connectors we recommend Microwave Connector Care Quick Reference Card 08510 90360 K y NON Center Conductor Support Bead Inner Conductor Contact Mechanism Outer Conductor Coupling Nut ns Sleeve Figure 10 Use and Care of APC 7 Connectors To Connect 1 O
15. is symbol indicates that the instrument requires alternating current ac input ce The CE mark is a registered trademark of the European Community If it is ccompanied by a year it indicates the year the design was proven QD 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 Scientific and Medical Group 1 lass A product CISPER 11 Clause 4 O 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 772D 773D Operating and Service Manual Safety Earth This is a Safety Class I product provided with a protective earthing Ground 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 Verify that the product is configured to match the available main power 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 772D 773D Operating and Service Manual vii Safety and Re
16. l be performed at Buyer s facility only upon Agilent s prior agreement and Buyer shall pay Agilent s round trip travel expenses In all other areas products must be returned to a service facility designated by Agilent For products returned to Agilent for warranty service Buyer shall prepay shipping charges to Agilent and Agilent 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 from another country Agilent warrants that its software and firmware designated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument Agilent 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 SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 772D 773D Operating and Service Manual iii Assistance Hewlett Packard to Agilent Technologies Transition EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN
17. nce test contact the nearest Agilent Sales and Service office Refer to the Service and Support information in the front matter of this manual Agilent 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 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 office 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 The instrument should be stored in a clean dry environment The following environmental limitations apply to both storage and shipment a Temperature 5 to 475 C b Altitude 7620 meters 25 000 feet c Humidity 95 relative 772D 773D Operating and Service Manual 17 Using the 772D Dual Directional Coupler CAUTION Figure 7 Operating Information Operating Information 772D Dual Direction Coupler Maximum power input is 50 W CW or 250 W peak Greater power may damage the 772D 1 Connect the signal from the signal source to the INPUT connector 2 Conne
18. noneconnector retract the coupling sleeve by turning the coupling nut counterclockwise until the sleeve and nut disengage 2 Onthe 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 3 Push the connectors firmly together and thread the coupling nut of the connector with retracted sleeve over the extended sleeve 4 DO NOT tighten the other coupling nut since this will tend to loosen the electrical connection Wider Band P Contacting Surfaces To Disconnect 1 Loosen the coupling nut of the connector showing the wider gold band CAUTION Part the connectors carefully to prevent striking the inner conductor contact 772D 773D Operating and Service Manual 23 Service Instructions Care Donotuse aromatic hydrocarbons such as acetone trichlorethylene carbon tetrachloride or benzene to clean connector surfaces Do not spray any liquid solvent directly onto connector surfaces Connector wear eventually degrades performance To prolong the life of your connectors o Inspect and clean all surfaces that come in contact o Do not connect to a damaged connector Replace damaged connectors o Turn only the connector nut not the device when making connection 24 772D 773D Operating and Service Manual
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