HP 11652A User's Manual
Contents
1. OPERATING AND SERVICE MANUAL TRANSMISSION REFLECTION o e AT g 11652A DIRECTIO NAL BRID sap gd TOS f mm 0 aL CENTER ING po Not SHIP i l HEWLETT Pq JUNE 1980 o ta Er Page 2 Models 11652A 8721A Ve a A Va rs rr rem e er er a BACH Figure 1 HP 116524 Transmission Reflection Kit and HP 8721A Directional Bridge Models 11652A 8721A Page 3 Table 1 Contents of HP 11652A Transmission Reflection Kit 1 1 1250 0076 2 Conn Angle 2 1 1250 0080 8 Conn RF Adptr 3 1 1250 0216 2 Conn RF BNC 4 1 1250 0929 Conn BNC Short 5 1 8721A Directional Bridge 6 1 11652 60001 4 Precision Termination 7 2 11652 60002 5 Cable Assy 1 ft 8 1 11652 60003 6 Cable Assy 2 ft 9 1 11652 60004 7 Cable Assy 3 ft 1 in 10 1 11652 60009 2 Power Splitter INTRODUCTION The HP Model 116524 Transmission Reflection Kit see Figure 1 is used when characterizing 50 ohm RF networks from 0 1 to 110 MHz Swept measurements may be made when the HP 11652A is used with the HP 84074 Network Analyzer see Figures 4 and 5 Single frequency measurements may be made when using the HP 11652A with the HP 8405A Vector Voltmeter see Figures 6 and 7 The HP Model 8721A Directional Bridge which is available separately or as part of the HP Model 116524 Transmission Reflection Kit is princi pally used to make reflection measurements The HP 8721A is also very useful for p2. 86908 86988 SWEEP OSCILLATOR E 2 FT OR 3 FT CABLE me 30 POWER SPLITTER ON FRONT PANEL iF 86908 1S USED RF OUT Power Splitter 17652 60009 impedance 50 ohm nominal Input VSWR 1 02 gt 40 dB return loss Output VSWR 1 02 gt 40 dB return loss when used with the HP 8407A or HP 8405A Connectors BNC female dB When terminated in 50 ohms Circuit Equivalent of Power Splitter Precision Termination 11652 60001 impedance 50 ohm nominal VSWR 1 014 gt 43 dB return loss Connector BNC male nh pF ml De JR Typical values only Circuit Equivalent of Precision Termination BLANKING VTO INE SWEEP EN REF CHAN DIRECT I TEST CHAN DIRECT HP 8407A ae IA DE 1 FT CABLE MAINFRAME PHAS A u Page 6 b Power from the sweeper is again divided into a reference and a test channel This time how ever the signal entering the test channel is the re flected voltage from the input to a network not the transmitted voltage The HP 8407A takes the ratio of ErgF LECTED EINCIDENT which is defined as reflection coefficient c The cable lengths specified are necessary to ensure proper phase matching of the two channels d The general procedure for making a re flection measurement is the following refer also to AN 121 1 Network Analysis with the HP 8407A 0 1 110 MHz 1 Setup the equipment as shown in Figure 5 2 Place a short circuit or ope
3. 8721A DIRECTIONAL BRIDGE HP 8491A OPT 10 10 dB COAXIAL ATTENUATOR FT CABLE HP B405A VECTOR VOLTMETER TERMINATION HPTISISA PROBE TEE HP 9084 COAXIAL TEAMINATION HP 11538A gt PROBE TEE O REFLECTED 1280 0879 BNC SHORT fof Juan TERMINATION TEST NETWORK Figure 7 Setup for Making Reflection Measurements with HP 8405A Be sure the HP 8721A Directional Bridge is being used as a reverse coupler not as a forward coupler during a reflection measurement see Fig ure 5 This ensures that only the reflected signal will enter the test channel EREFLECTED MAINTENANCE Specifications for the Directional Bridge Power Splitter and Precision Termination are given in Table 2 However the individual specifications for these components are of such a tolerance that the ambiguities encountered in the directivity port VSWR and Input Output VSWR measure ment setups impair the checking of each of the component s specifications Verification of the individual specifications can be accomplished by using an 8507B Automatic Network Analyzer with an Accuracy Improved Measurement AIM Program This system will remove the vector mismatch uncertainties from the measurements REPLACEABLE PARTS The HP 87214 Directional Bridge the Power Splitter and the Precision Termination are not field repairable if any pa them do not meet the specifications in Table 2 return
4. TED STATES IN EUROPE CALIFORNIA _ SWITZERLAND 3939 Lankershim Blvd HEWPAK S A North Hollywood 91604 1217 Meyrin GEORGIA l Geneva PO Box 28234 450 Interstate North Atlanta 30328 ILLINOIS IN AFRICA ASIA AND AUSTRALIA H t o o Stree Hewlett Packard Export Marketing 3200 Hillview Ave NEW JERSEY ee W 120 Century Road Palo Alto California 94304 Paramus 07652 iN CANADA QUEBEC IN CENTRAL AND SOUTH AMERICA Hewlett Packard Canada Ltd Hewlett Packard Inter Americas 275 Hymus Blvd 3200 Hillview Ave Pointe Claire Palo Alto California 94304 o ean 11652 90002 PRINTED IN U S A
5. d return loss 20 Log reflection coefficient To find the ratio of two voltages measure the voitages present at a prescribed test channel and _ compare it to a reference voltage To make a re flection measurement use an instrument such as the HP 8405A Vector Voltmeter and connect the directional bridge as shown in Figure 2 Figure 2 Reflection Measurements with the HP 87214 Models 11652A 8721A Power Monitoring with the HP 8721A Power monitoring can also be accomplished by the HP 8721A Directional Bridge The 8721A can monitor the power being produced by a source while loaded and aiso monitor the power being delivered to a remote load To use the directional bridge for this purpose insert the bridge as shown in Figure 3 Since there is a 6 dB drop be low the source power level in both arms of the bridge the power meter measures the power de livered to the load Figure 3 Power Monitoring with the HP 8721A HP 11652A Kit Measurements with the HP 8407A Transmission Refer also to AN 121 1 Network Analysis with the HP 84074A 0 1 110 MHz a The HP 11652A is used as shown in Fig ure 4 when making a transmission measurement b Power entering the power splitter is di vided into two channels reference and test The HP 8407A measures the ratio of the test channel to the reference channel and measures the phase difference between the two channels c The cable lengths specified are necessary i
6. dge Establish a O dB 180 degree reference level with the CHANNEL switch set to B Use the oscillator output attenuator to set the amplitude and the HP 8405A PHASE ZERO to set the phase c Replace the short or open with the terminated network and read return loss in dB degrees PRECAUTIONS Do not misplace the cables supplied with the kit They have been carefully chosen for proper elec trical length and are triple shielded for isolation Be sure to use proper lengths of cable during set up refer to Figures 4 through 7 OMIT iF 8414A IS SS A HP 8412A MAINFRAME PHASE MAGNITUDE DISPLAY R HP BSI A POLAR DISPLAY SHORT J A CALIBRATE LOAD 1 4 2 MEASUREMENT das lt H TERMINATION TEST NETWORK Figure 5 Basic Setup for Reflection Measurements Models 11652A 8721A SIGNAL SOURCE SUCH AS HP 32008 VHF OSCILLATOR OR HP 508F SIGNAL GENERATOR HP 8405A VECTOR VOLTMETER HP 84914 OPT 10 HP 908A 10 dB COAXIAL COAXIAL ATTENUATOR TERMINATION 1 FT CABLE ENCTYPEN HP 11536A ADAPTER PROBE TEE E de i E HP 8491A OPT 10 HP 908A POWER TFT CABLE SPLITTER BNC TYPE N ADAPTER 10 dB COAXIAL COAXIAL ATTENUATOR TERMINATION LA sil HP 11536A PROBE TEE Figure 6 Setup for Making Transmission Measurements with HP 8405A SIGNAL SQUACE SUCH AS HP 32008 VHF OSCILLATOR OR HP SOBF VHF SIGNAL GENERATOR IFT t a CABLE POWER SPLITTER HP
7. n cir cuit at the LOAD port of the direc tional bridge Establish a O dB 180 degree or O dB zero degree refer ence level on the HP 8407A Phase Magnitude Display or the HP 8414A Polar Display 3 Replace the short with the termi nated network and make the meas urement HP 11652A Kit Measurements with the HP 8405A Vector Voltmeter 0 1 to 110 MHz The HP 11652A can be used with the HP 8405A Vector Voltmeter to make CW transmission and reflection measurements The procedure is out lined below Refer also to the HP 8405A Opera ting and Service Manual BLANKING SWEEP OUT POUT HP REOTA GENERATOR SWEEPER OR HP 86908 296988 SWEEP OSCILLATOR 900552 RF OUT qq 2 FECABLE CABLE POWER SPLITTER gt ON FRONT PANEL IF 86908 IS USED 1 FT CABLE REFLECTED E A 1 FT CABLE bp dog G SOURCE Models 11652A 8721A Transmission a Setup the equipment as shown in Figure 6 b Establish a O dB zero degree reference level with the CHANNEL switch set to B Set the amplitude with the oscillator attenuator and the phase with the HP 8405A PHASE ZERO c Insert the test device at point A in Fig ure 6 and make the measurement Reflection a Setup the equipment as shown in Figure 7 Be sure to use the cable lengths specified from the HP 11652A in order to ensure proper phase matching between channels A and B b Place a short circuit at the LOAD port of the directional bri
8. n order to ensure matched electrical lengths be tween channels d The general procedure for making a transmission measurement is the following refer also to AN 121 1 Network Analysis with the HP 8407A 0 1 110 MHz 1 Setup the equipment as shown in Figure 4 2 Establish a O dB zero degree refer ence level on the HP 84074A 3 Insert the test network at point A and make the measurement Reflection Referalso to AN 121 1 Network Analysis with the HP 8407A 0 1 110 MHz a The HP 11652A is used as shown in Fig ure 5 when measuring complex impedance reflec tion coefficient or return loss VSWR Models 11652A 8721A 2 ba a pr PVE RR a AAAA A A arr 00 000 ar ert ras Page 5 Table 2 Specifications COMPLETE KIT Plastic Case Dimensions 10 in by 7 1 2 in by 2 3 8 in Net Weight 2 lb 3 oz COMPONENTS Directional Bridge HP 8721A impedance 50 ohm nominal Load Port VSWR lt 1 063 30 dB return loss Directivity gt 40 dB gt 30 dB 0 1 1 0 MHz Coupling 6 dB nominal 0 6 dB fre quency variation when used with HP 8407A Network Analyzer Transmission 6 dB nominal insertion loss 0 2 dB frequency variation when used with HP 8407A Network Analy zer Maximum input power 20 dBm Connectors BNC female incident Reflected Circuit Equivalent of Directional Bridge VTO JSWEEP BLANKING our OUT jOUT HP 8601A GENERATOR SWEEPER OR TFT CABLE HP
9. ower monitor ing and closed loop leveling applications INITIAL INSPECTION Mechanical Check If damage to the shipping carton is evident ask that the carrier s agent be present when the in strument is unpacked Inspect the parts for me chanical damage such as scratches or dents Also check the cushioning material for signs of severe stress Electricai Check The electrical performance should be verified as soon as possible after receipt Refer to the para graph on MAINTENANCE Claim for Damage If any unit is mechanically damaged or fails to meet specifications upon receipt notify the car rier and your nearest Hewlett Packard office im mediately a list of regional offices is at the rear of this operating note Retain the shipping carton and the padding for the carrier s inspec tion The HP office will arrange for repair or re placement 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 near you a list of regional offices is at the rear of this operating note If the Model 11652A or Model 8721A is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required re turn address and model or part number Also mark the container FRAGILE to assure careful handling Using Other Packaging If it is de
10. sired to return a component without its case the following general instructions should be used for repackaging with commercially available materials Page 4 a Wrap the component in heavy paper or plastic If shipping to a Hewlett Packard office attach a tag indicating the type of service re quired return address and model or part number b Use a strong shipping container A double wall carton made of 350 pound test ma terial is adequate c Use enough shock absorbing material three to four inch layer around all sides of the fixture to provide a firm cushion and prevent movement inside the container d Seal the shipping carton securely e Mark the shipping carton FRAGILE to assure careful handling TRANSMISSION REFLECTION KIT CONTENTS Refer to Table 1 for a list of the components furnished in the HP Model 11652A Transmission Reflection Kit SPECIFICATIONS Refer to Table 2 for the specifications and circuit representations of the components in the HP 116524 Kit OPERATION Reflection Measurements with the HP 3721A The HP Modei 8721A Directional Bridge func tionally similar to a directional coupler is a valu able device in reflection measurements and power monitoring By measuring the reflected voltage and comparing this to the voltage incident upon a device under test you can characterize the test device for its complex reflection coefficient EREFLECTED EINCIDENT complex impedance VSWR an
11. the component to the HP Service Center nearest you CERTIFICATION ry The Hewlett Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory The Hewlett Packard Company further certifies that its calibration measurements are traceable to the U S National Bureau of Standards to the extent allowed by the Bureau s calibration facility l WARRANTY AND ASSISTANCE All Hewlett Packard products are warranted against defects in materials and workman ship This warranty applies for one year from the date of delivery or in the case of certain major components listed in the operating manual for the specified period We will repair or replace products which prove to be defective during the warranty period pro vided they are returned to Hewlett Packard No other warranty is expressed or implied We are not liable for consequential damages Service contracts or customer assistance agreements are available for Hewlett Packard products that require maintenance and repair on site For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual HEWLETT PACKARD SALES AND SERVICE OFFICES To obtain servicing information and order replacement parts contact the nearest Hewlett Packard Sales and Service Office in HP Catalog or contact the nearest regional office 0 IN THE UNI
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