HP 773d User's Manual
Contents
1. HEWLETT B8 PACKARD Copyright HEWLETT PACKARD COMPANY 1988 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A OPERATING AND SERVICE MANUAL PART NO 00772 90001 Edition 1 1288 Microfiche Part No 00773 90004 HP 772D HP 773D Figure 1 HP 772D and HP 773D Directional Couplers HP 772D HP 7730 RT This Operating Manual contains information about initial inspection General 5 Information performance tests adjustments operation and troubleshooting of the ibi HP 772D 773D Directional Couplers On the title page of this manual is a Microfiche part number This number can be used to order a 4 x 6 inch microfilm transparency of this Operating Note Description 7720 Dual Directional Coupler The 7720 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 HP 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 HP 773D Directional Coupler The HP 773D Directional Coupler is a three port passive device Directional couplers in their auxiliary arms sample the power flowing in one direction in the mainline and ignore power flowing in the opposite directio2. HP11664A DETECTOR HP772D DIRECTIONAL COUPLER HP11664A DETECTOR Figure 10 HP 772D 773D Performance Test Setup 1 17 HP 772D HP 773D Directivity Test Note This test assumes that setup and calibration has already been completed To check that the Couplers meet the directivity specifications in Table 1 perform the following steps The accuracy of the test system must be added to the directivity specification in Table 1 1 Connect the fixed termination as shown in Figure 10 2 Set the network analyzer Channel 1 reference level to 36 dBm Verify that the is within specification from 0 1 GHz to 2 GHz Directivity 0 1 to 2 GHz reat L 36 dB 3 Connect the sliding load as shown in Figure 10 At frequencies of interest phase move the load element Read the peaks and troughs and calculate the difference in dB Find the appropriate correction factor from Table 4 Actual directivity Directivity peak value in dB Degg Table 4 Correction for Element Reflection of the HP 905A 4 Verify that directivity is within specification from 2 GHz through 18 GHz Directivity 2 GHz 12 4 GHz 1 30 dB Directivity 12 4 GHz to 18 GHz _ lt 27 dB VSWR Test Maximum Coupling Variation With Frequency Test Tracking Test HP 772D only Primary Line Residual Loss Test HP 772D HP 773D To check that your Directional Coupler meets VSWR speci
3. a reference Insert the Directional Coupler under test and read the indication from the reference line HP 772D HP 773D Replaceable Parts 1 20 00772 20001 00772 20003 5040 0274 0361 0207 2510 0119 00772 80001 00773 80001 1401 0081 Service Caution HP Part No There are no internal replaceable parts within the HP 772D or HP 773D Directional Couplers The connectors and HP 772D bottom package are not considered field repairable and are not listed The parts listed in Table 5 are field repairable Table 5 Replaceable Parts HP 772D Top package does not include ends 7720 End two required HP 772D Foot 4 required HP 773D Foot 4 required HP 772D Screw Flat Head Pozidrive 8 32 x 1 4 16 required HP 772D ID Label HP 773D ID Label APC 7 Connector Dust Cover If your HP 772D or 773D does not pass the performance tests return it to Hewlett Packard Do not disassemble the HP 772D or 773D directional coupler assembly or any of the connectors Doing so will disturb the center conductor and adversely affect directivity Evidence of attempted customer repair will void warranty MANUAL CHANGES MANUAL IDENTIFICATION ee Model Number 772D 773D DIRECTIONAL COUPLER n t Part Number 00772 90001 ABOUT THIS SUPPLEMENT Use this supplement to correct your manual or to update it for instrument changes that occurred after the
4. 2 GHz for both units Delete the Auxiliary Line SWR specification for 0 1 to 2 GHz Delete the Primary Line Residual Loss specification for Opt O01 Change the specifications in the Limits column to the following HP 772D Maximum Primary Line SWR 2 12 4 GHz to 1 28 12 4 to 18 GHz to 1 40 Nominal Coupling 2 18 GHz to 20 dB 772 773D Maximum Coupling Variation 2 18 GHz to 1 dB HP 772D Primary Line Residual Loss 2 18 GHz to 1 5 dB HP 773D Primary Line Residual Loss 2 18 GHz to 0 90 dB Errata Manual change supplements are revised as often as necessary to keap mariuats as Current and accurate as possible Hewlett Packard recommends that you periodically request the latest edition of this supplement Free copies are available from offices When requesting copies quote the manua identification informabor fram your supplement or the model number and print date from the title page o the manual 0689 2 HEWLETT ae U PACKARD Printed in G S A 7720 7730 00772 90001 CHANGE INSTRUCTIONS Page 1 6 Supplemental Characteristics Add the following information to Supplemental Characteristics HP 772 773D Minimum Directivity 0 1 2 GHz is 39 dB Typ HP 772D Minimum Directivity 18 20 GHz is 20 dB Typ HP 7730 Minimum Directivity 18 20 GHz is 21 dB Typ HP 772D Maximum Primary Line SWR 0 1 2 GHz is 1 05 Typ HP 773D Maximum Primary Line SWR 0 1 2 GHz is 1 04 Typ HP
5. 772D Maximum Primary Line SWR 18 20 GHz is 1 29 Typ HP 773D Maximum Primary Line SWR 18 20 GHz is 1 16 Typ HP 772D Maximum Auxiliary Line SWR 0 1 2 GHz is 1 08 Typ HP 773D Maximum Auxiliary Line SWR 0 1 2 GHz is 1 07 Typ HP 772 773D Maximum Auxiliary Line SWR 18 20 GHz is 1 17 Typ HP 772D Primary Line Residual Loss 0 1 2 GHz is 0 26 dB Typ HP 773D Primary Line Residual Loss 0 1 2 GHz is 0 15 dB Typ HP 772D Primary Line Residual Loss 18 20 GHz is 1 3 dB Typ HP 773D Primary Line Residual Loss 18 20 GHz is 0 6 dB Typ Errata Page 1 6 Table 2 Effective Source Match Add a the frequency range 18 20 GHz 7720 Effective Source Match is gt 1 32 HP 773D is gt 1 28 Errata REGIONAL SALES AND SUPPORT OFFICES For information relating to Sales or Support of Hewlett Packard products first contact your local Hewiett Packard office listed in the white pages of your telephone directory If none is listed locally contact Hewlett Packard at one of the offices listed below to obtain the address or phone number of the Sales or Support office nearest you ASIA Hewlett Packard Asia Ltd 47 F 26 Harbour Road Wanchai HONG KONG G P O Box 863 Hong Kong Tel 852 5 8330833 Telex 76793 HPA HX Cable HPASIAL TD AUSTRALASIA Hewlett Packard Australia Ltd 31 41 Joseph Street BLACKBURN Victoria 3130 Australia Tel 61 895 2895 Telex 31 0
6. HP 905A No substitution Fixed Termination HP 909F Directional Coupler HP 773D Fixed Short HP 85050 80007 APC 7 or HP 85054 60025 m 1 Connect your HP 772D or HP 773D to the test equipment as shown in Figure 10 2 Set the test equipment controls as follows Sweep Oscillator Network Analyzer RF Plug in Start Marker 100 MHz STOP Marker 18 GHz Trigger Internal Time 0 2 seconds Display Blanking ON Modulation ON Channel 1 ALC Mode Internal Display A R RF ON Display A R Scale 1 dB din Reference Level 0 dBm 3 Perform Short Open calibrations according to the directions for your network analyzer The calibration should be automatically stored in Channel 1 memory 4 On the HP 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 E Er A CT See Calculating HP 772D Error under Supplemental Characteristics in this manual HP 772D HP 773D ANALYZER HP HP83508 ILLAT SWEEP OSCILLATOR HP 8757A SYSTEM INTERFACE HP 835928 RF PLUG IN Sliding Load HP 905A Termination HP 909F HP773D DIRECTIONAL COUPLER 8757 HP83508 NETWORK ANALYZER SWEEP OSCILLATOR HP 8757A SYSTEM INTERFACE HP 835928 RF PLUG IN Sliding Load HP 905A Termination 909
7. 24 Cabie HEWPARD Melbourne CANADA Hewlett Packard Canada Ltd 6877 Goreway Drive MISSISSAUGA Ontario L4V 1M8 Tel 416 678 9430 Telex 069 8644 JAPAN Yokogawa Hewlett Packard Lid 29 21 Takaido Higashi 3 Chome Suginami ku TOKYO 168 Tel 03 331 6111 Telex 232 2024 YHPTOK MEDITERRANEAN amp MIDDLE EAST Hewlett Packard S A Mediterranean and Middle East Operations Atrina Centre 32 Kifissias Avenue Paradissos Amarousion ATHENS Greece Tel 30 682 88 11 Telex 21 6588 HPAT GR Cable HEWPACKSA Athens February 1986 BENELUX amp SCANDINAVIA Hewl tt Packard S A Uilenstede 475 P O Box 999 NL 1183 AG AMSTELVEEN The Netherlands Tel 31 20 43 77 71 Telex 18 919 hpner nl SOUTH amp EAST EUROPE AFRICA Hewlett Packard S A 7 rue du Bois du Lan CH 1217 MEYRIN 2 Geneva Switzerland Tel 41 22 83 12 12 Telex 2 835 hmea Cable HEWPACKSA Geneve FRANCE Hewlett Packard France Parc d activit s du Bois Briard 2 avenue du Lac 91040 EVRY Cedex Tel 1 6 077 83 83 Telex 6923 15F GERMAN FEDERAL REPUBLIC Hewlett Packard GmbH Hewlett Packard Strasse Postfach 1641 D 6380 BAD HOMBURG West Germany Tel 06172 400 0 Telex 410 844 hpbhg ITALY Hewlett Packard italiana S p A Via G Di Vittorio 9 1 20063 CERNUSCO SUL NAVIGLIO Milano Tel 02 92 36 91 Telex 334632 UNITED KINGDOM Hewlett Packard Ltd King Street Lane Winnersh WOKINGHAM Berkshire RG11 5A
8. 2D Error 0 1 to 2 0 GHz 1 8 Figure 5 HP 772D Error 2 0 to 12 4 GHz HP 772D HP 773D NC ES 7 wi cui q EL BEM 0 Reflection Ty 1 Figure 6 HP 772D Error 12 4 to 18 0 GHz Table 3 Recommended Test Equipment Mates with Type N female Mates with APC 7 Sweep Oscillator CW and swept frequency signal in HP 8350B main frame with HP 0 01 GHz to 40 GHz range 83592B RF Plug in 0 01 to 20 GHz Scalar Network Analyzer Swept frequency transmission and HP 8757A P capability Detectors 2 Range 60 dBm to 16 dBm HP 11664A P T Coaxial Short Mates with Type N male HP 85054 60026 PT HP 85054 60025 Coaxial Open PT reflection measurements from 0 01 HP 85050 80007 to 60 GHz AC DC detection HP 85054 60028 Mates with Type N male HP 85054 60027 HP 85050 80010 Mates with Type N female Mates with APC 7 P Performance Test T Troubleshooting HP 772D HP 77 bi 80777777 0 0 000 mM Mmm installation 1 10 3D Initial inspection Connectors Inspect the shipping container for damage 1f the shipping container or packaging material is damaged it should be kept until the contents of the shipment have been checked If there is mechanical damage or if the Directional Couplers do not pass the performance tests notify the nearest Hewlett Packard office Keep the damaged shipp
9. OPERATING AWN D SERVICE MANUAL ma HP 772D HPTT3D DIRECTIONAL COUPLER MM REA HEWLETT PACKARD Operating and Service Manual Part No 00772 90001 Edition 1 E1288 Microfiche Part No 00772 90004 CERTIFICATION Hewlett Packard Company certifies 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 one year from date of shipment During the warranty period Hewlett Packard Company will atits 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 shail pay shipping charges to return the product to Buyer However Buyer shall pay all ship ping 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 progra
10. R Tel 734 78 47 74 Telex 847178 EASTERN U S A Hewlett Packard Co 4 Choke Cherry Road ROCKVILLE MD 20850 Tel 301 670 4300 MIDWESTERN U S A Hewlett Packard Co 5201 Toliview Drive ROLLING MEADOWS IL 60008 Tel 312 255 9800 SOUTHERN U S A Hewlett Packard Co 2000 South Park Place P O Box 105005 ATLANTA GA 30348 Tel 404 955 1500 WESTERN U S A Hewlett Packard Co 5161 Lankershim Blvd P O Box 3919 NO HOLLYWOOD CA 91609 Tel 818 506 3700 OTHER INTERNATIONAL AREAS Hewlett Packard Co Intercontinental Headquarters 3495 Deer Creek Road PALO ALTO CA 94304 Tel 415 857 1501 Telex 034 8300 Cable HEWPACK
11. 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 HP 772D HP 773D Caution To Disconnect 1 Loosen the coupling nut of the connector showing the wider gold band Part the connectors carefully to prevent striking the inner conductor contact Care Lh Keep the contacting surfaces smooth and clean Irregularities and foreign particles can degrade electrical performance Protect the contacting surfaces when the connector is not in use by leaving the coupling sleeve extended Use lintless material and or firm bristled brush such as toothbrush for cleaning If a cleaning fluid is needed use isopropyl alcohol IMPORTANT Do not use aromatic or chlorinated hydrocarbons esters ethers terpenes higher alcohols ketones or ether alcohols such as benzene toluene turpentine dioxane gasoline cellosolve acetate or carbon tetrachloride Keep exposure of the connector parts to both the cleaning fluid and its vapors as brief as possible HP 772D HP 773D Operation 0 0000 Operating Envi
12. fications in Table 1 use any test system that has a reflection coefficient accuracy better than 0 01 40 dB directivity Connect the port of the Coupler under test to the system and terminate all unused ports with a 50 ohm load Repeat this measurement on both primary ports and all auxiliary ports To check that your Directional Coupler meets the maximum coupling variation specification in Table 1 measure the coupling at the COUPLED port with respect to the OUTPUT port on the HP 773D For the HP 772D measure coupling at the INCIDENT port with respect to TEST PORT Use any insertion loss measurement system capable of measuring to an accuracy of 0 3 dB or better Be sure to terminate any unused ports with accurate 50 ohm loads To check that the HP 772D meets the tracking specifications in Table 1 make a ratio measurement as shown in Figure 10BA Measure the difference in coupling at the REFLECTED and INCIDENT ports while phasing moving a moving short connected to the TEST PORT Read the average indication as the tracking Note that the accuracy of the measurement system must be added to the specifications in Table 1 To check that your Directional Coupler meets the primary line residual loss specifications in Table 1 first calibrate the same equipment as used for the coupling test without a DUT connected in the test setup Store the trace in the Network Analyzer memory and use Measurement Memory Mode The trace can now be used as
13. ing materials if any for inspection by the carrier and a Hewlett Packard representative Storage and Shipment Storage Environment The Directional Couplers should be stored in a clean dry environment The following limitations apply to both storage and shipment Temperature 5 to 75 C Relative Humidity lt 95 Altitude lt 7620 metres 25 000 feet Original Packaging Containers and materials identical to those used in factory packaging are available through Hewlett Packard offices If the Direction Couplers are being returned to Hewlett Packard for calibration or service attach a tag indicating the type of service required return address model number and serial number Also mark the container FRAGILE to assure careful handling In any correspondence refer to the instrument by model number and serial number For instruction on connecting and care of your connectors we recommend Microwave Connector Care HP part number 08510 90064 For the use and care of APC 7 connector see Figure 5 ee HP 772D HP 773D WIDER BAND COUPLING SLEEVE CONTACTING SURFACES E A SUPPORT BEAD CN CENTER CONDUCTOR INNER CONDUCTOR CONTACT MECHANISM QUTER CONDUCTOR COUPLING NUT COUPLING SLEEVE Figure 7 Use and Care of APC 7 Connectors Use To Connect 1 On one connector retract the coupling sleeve by turning the coupling nut counterclockwise until the sleeve and nut disengage 2 On the other
14. le on request from your nearest Hewlett Packard office For information concerning a serial number prefix not listed on the title page or in the Manual Changes supplement contact your nearest Hewlett Packard office The Directional Couplers are warranted and certified as indicated on the inside cover of this manual Specifications Characteristics and Conditions Frequency Range Minimum Directivity 0 1 to 2 GHz 2 to 12 4 GHz 12 4 to 18 GHz Maximum Primary Line SWR HP 772D 0 1 to 2 GHz 2 to 12 4 GHz 12 4 to 18 GHz HP 773D 0 1 to 2 GHz 2 to 12 4 GHz 12 4 to 18 GHz Maximum Auxlary Line SWR 0 1 to 2 GHz 2 to 12 4 GHz 12 4 to 18 GHz Nominal Coupling 2 18 GHz Maximum Coupling Variation HP 772D 2 to 12 4 GHz 12 4 to 18 GHz HP 773D 2 to 18 GHz 1 4 The specifications listed in Table 1 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 0 1 to 18 GHz 36 dB 30 dB 27 dB 50 ohm nominal impedance 50 ohm nominal impedance 20 2 t dB Established with a best fit line through the coupling curve TEST PORT to INCIDENT OUTPUT to COUPLED PORT HP 772D HP 773D Table 1 Specifications With HP 772D TEST PORT shorted and not including source match ripple Refers to the relative tracking of the auxiliary arms auxiliary arms do not
15. manual was printed Some material in this supplement should be substituted for material in the manual You can either perform the physical substitution or simply mark your manual with reference to appropriate pages in the supplement Change instructions are arranged in the manuals page number order Then each instruction is identified by the word Errata or with a change number Errata changes relate to all Instruments Instructions with change numbers relate only to certain instruments These instruments are identified by serial number or prefix in the following table This symbol identifies instructions that are appearing in the supplement for the first time pese Serial Prefix oc Number 4 Make Manual Changes qp Senai Prefix or Number Ss Make Manual Changes i serial change Errata Only VENDS 40 a a Ona fp m xu i Wt i lt a d i E E 2a 222222 35502 CHANGE INSTRUCTIONS Page 1 4 Table 1 Specifications The 772D and 7730 Directional Couplers are specified from 2 GHz to 18 GHz Delete all specifications for the 0 1 to 2 GHz frequency range as follows Change the limits of Frequency Range to 2 to 18 GHz Deiete the Minimum Directivity specification for 0 1 to 2 GHz Delete the Maximum Primary Line SWR specification for 0 1 to
16. mming 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 inade quate 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 HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY 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 SPE CIAL 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 For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual OPERATING AND SERVICE MANUAL 7720 7730 DIRECTIONAL COUPLER SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 2829A and above For additional important information about serial numbers see INSTRUMENTS COVERED BY THIS MANUAL
17. n They can be used for measurement purposes or for power leveling The coupling in the HP 773D changes the same as the coupling variation of the input coupler in the HP 7720 This property may be used to cancel out the coupling variation of the HP 772D in a reflectometer setup by using the HP 773D to change the coupling for tracking purposes instruments Covered This instrument has a two part serial number The first four digits by Manual 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 listed under SERIAL NUMBERS on the title page Manual Changes Directional Couplers manufactured after the printing of this manual Supplement may have a serial number prefix that is not listed on the title page If your Directional Coupler has a prefix number not listed on the title page look for a yellow Manual Changes supplement that documents the differences In addition to change information the supplement may contain information for correcting errors in the manual To keep this manual as current and accurate as possible Hewlett Packard recommends that you periodically request the latest Manual Changes supplement The supplement is keyed to the manual print date and part number both of which appear on the title page HP 772D HP 773D Warranty Copies of the supplement are availab
18. necessarily track in absolute power Typical relative tracking between HP 772D and 773D is lt 0 7 dB Primary Line Residual Loss HP 772D Opt 001 HP 773D Opt 001 Maximum Power Input 50W 47 dBm average 250 W 54 dBm peak Connectors MIL C 39012 HP 772D INPUT Type N female INCIDENT Type N female REFLECTED Type N female TEST PORT APC 7 HP 773D INPUT APC 7 COUPLED Type N female OUTPUT APC 7 Option 001 Type N female On all ports on both HP 772D and 773D Operating Environment Temperature Range Humidity Maximum Altitude Net Weight HP 772D HP 773D 09 to 55 lt 95 4570 metres 15 000 feet 2 6 kg 5 72 1b 0 8 kg 1 76 1b Dimensions HP 772D Length 391 mm 15 4 in Width 133 mm 5 3 in Height 43 mm 1 7 in HP 773D Length 186 mm 7 3 in Width 108 mm 4 3 in Height 30 mm 1 2 in 1 5 HP 772D HP 773D Supplemental Characteristics N I 2 gt Q z uJ 2 ac Supplemental characteristics are not specifications that is they 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 Effective Source Match Effective source match is the apparent reflection at the output of an RF generator s
19. ronment operating environment for the Directional Couplers should be within the following limits Temperature 0 to 55 C Relative Humidity 9596 Altitude 4570 metres 15 000 feet Operating Precautions Caution Do not use 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 1 Inspect and clean all surfaces that come in contact 2 Do not connect to a damaged connector Replace damaged connectors 3 Turn only the connector nut not the device when making connection 1 13 HP 772D HP 773D Using the HP 772D Dual Directional Coupler 7504 Figure 8 HP 772D Dual Directional Coupler Caution Maximum power input is 50W CW or 250W peak Greater power may damage the HP 772D 1 Connect signal from signal source to the INPUT connector 2 Connect output signal from TEST PORT connector to the test setup 3 Connect 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 4 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 b
20. y 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 HP 772D HP 773D Using the HP 773D Directional Coupler Figure 9 HP 773D Directional Coupier Caution Maximum power input is 50W CW 250W peak Greater power may damage the HP 773D Numerals are keyed to the numbers in parentheses below i Connect signal from signal source to the INPUT port 2 Connect output signal from OUTPUT port to the test setup 3 Connect the 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 HP 772D HP 773D LT O ttt A M Performance Tests setup and Calibration The following procedures test the HP 772D and 773D electrical performance specified in Table 1 All tests can be performed without access to the interior of the instrument Figure 10 shows the test setup used for the subsequent performance tests To account for frequency response errors and calibrate your test setup perform the following procedure Equipment Sweep Oscillator HP 8350B RF Plug In HP 83592B Network Analyzer HP 8757A Detectors 2 HP 11664A Sliding Load
21. ystem which uses the HP 772D used as a reflectometer or HP 773D Table 2 Effective Source Match 0 1 to 2 GHz 2 to 12 4 GHz 12 4 to 18 GHz Voltage Incident on HP 772D TEST PORT and HP 773D INPUT Figure 2 depicts the typical coupling curve of the HP 772D and HP 773D 019721 23 25 27 29 31 33 35 37 39 41 43 COUPLING IN dB Figure 2 Voltage incident on HP 772D TEST PORT and HP 773D INPUT HP 772D HP 773D qu Directivity The following graph depicts the HP 772D 773D typical changes in directivity over the frequency range B RENI RR am eae UT Be ELECE CEN PNIS SELLLLLLLL 0 2 4 6 8 10 12 14 16 18 FREQUENCY IN GHz m Es z gt gt Q kit x ea Figure 3 Directivity Calculating HP 772D Error Analysis has shown the typical measurement error of the HP 772D to be A CL where E Error of Swept frequency Measurement A Directivity of HP 772D B Effective Source Match Coupler Directivity C Source Match T Reflection Coefficient of Unknown 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 Erp A CI These two equations are graphed as follows HP 772D HP 773D EC qe es P 0 Reflection 1 Figure 4 HP 77
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