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HP 85325A, Operating And Service Manual

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HP 85325A Operating and Service Manual

Service

Theory of Operation

Theory of Operation

A millimeter wave antenna measurement system (which uses an HP 85309A
frequency converter) consists of a transmitter and receiver section.

Figure 6-1 shows the block diagram of the antenna measurement system.

Figure 6-1

System Diagram

Summary of Contents for 85325A

Page 1: ...HP 85325A R Q U V W Millimeter Subsystem HP 85326A Millimeter Wave Interface Kit Operating and Service Manual ...

Page 2: ......

Page 3: ...HP 85325A R Q U V W Millimeter Subsystem HP 85326A Millimeter Wave Interface Kit Operating and Service Manual HP part number 85325 90061 Printed in USA 08 December 1998 Edition 2 0 ...

Page 4: ...ot furnished by Hewlett Packard 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 Hewlett Packard Company Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in...

Page 5: ...s Manual Chapter 1 Installation Chapter 2 Operation Chapter 3 General Information Chapter 4 Performance Verification Chapter 5 Timebase Check and Adjustment Chapter 6 Service Appendix A Using the HP 8340 41 in Your System Appendix B Connecting the Waveguide Properly ...

Page 6: ...ly upon HP s prior agreement and Buyer shall pay HP s round trip travel expenses In all other areas products must be returned to a service facility designated by HP For products returned to HP for warranty service 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 retu...

Page 7: ...N CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For assistance call your local Hewlett Packard Sales and Service Office refer to Service and Support on page viii ...

Page 8: ...50 Spectrum Way Mississauga Ontario L4W 5G1 905 206 4725 Europe Hewlett Packard European Marketing Centre Postbox 999 1180 AZ Amstelveen The Netherlands 31 20 547 9900 Japan Hewlett Packard Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 Japan 81 426 56 7832 81 426 56 7840 FAX Latin America Hewlett Packard Latin American Region Headquarters 5200 Blue Lagoon Drive 9th Floo...

Page 9: ...to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met Instrument Markings When you see this symbol on your instrument you should refer to the instrument s instruction manual for important information This symbol indicates hazardous voltages The laser radiation symbol is marked on products that have a laser output...

Page 10: ...ed 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 Power Verify that the product is configured to match the available main 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...

Page 11: ...e operating conditions the radio frequency interference limits are met at the border of his premises Model HP 85325A and Model HP 85326A Hiermit wird bescheinigt dass dieses Gert System in bereinstimmung mit den Bestimmungen von Postverfgung 1046 84 funkentst rt ist Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gertes Systems angezeight und die Berechtigung zur berprfung der Serie auf...

Page 12: ... keyboard Press Return Softkey Used for simulated keys that appear on an instrument display Press Prior Menu User Entry Used to indicate text that you will enter using the computer keyboard text shown in this typeface must be typed exactly as printed Type LOAD PARMFILE Used for examples of programming code endif ifndef NO_CLASS Path Name Used for a subdirectory name or file path Edit the file usr ...

Page 13: ...nuation 1 9 Figure 1 2 Reference Attenuator Installation 1 10 Figure 1 3 Test Attenuator Installation 1 10 Adjustment Procedures 1 11 Procedure 1 1 11 Figure 1 4 Measuring LO Power from the Reference Module 1 11 Figure 1 5 Reference Mixer Connections 1 12 Figure 1 6 LO Power Measurement Point for Test Module 1 13 Procedure 2 1 14 Mixer Operational Check 1 16 Figure 1 7 Test Mixer Connections 1 17 ...

Page 14: ... Supplied Equipment 3 5 Table 3 5 Supplied Parts 3 5 Maximum RF Cable Lengths 3 6 Figure 3 1 LS LR and LT Cables 3 6 Table 3 6 Maximum Cable Lengths meters 3 6 Formulas for Cable Length Maximums 3 7 Figure 3 2 LS LR LT Cable Lengths Example 3 7 4 System Performance Verification Introduction 4 1 Recommended Test Equipment 4 1 Non Banded Equipment 4 2 Table 4 1 Recommended Test Equipment non banded ...

Page 15: ...re 6 1 System Diagram 6 2 Transmitter Section 6 3 The Purpose of Each Device in the Transmitter Section 6 3 Allowable HP IB Cable Lengths 6 3 Extender Recommendations 6 4 Receiver Section 6 4 Purpose of Each Device in the Receiver Section 6 4 Receiver 6 5 Recommended Test Equipment 6 6 Non Banded Equipment 6 7 Table 6 1 Recommended Test Equipment Non Banded 6 7 Band Dependent Equipment 6 8 Table 6...

Page 16: ... A 1 HP 8340 41 RF Source A 1 8 Connecting the Waveguide Properly Handling and Storing B 1 Connecting WR 62 Waveguide B 1 Wear B 1 Visual Inspection B 1 Precision Flanges B 2 Figure B 1 Alignment Holes B 2 Aligning Two Precision Flanges B 3 Figure B 2 Inserting Slip Rings B 3 Figure B 3 Align Flanges B 3 Figure B 4 Inspect Flange Connections B 4 Aligning Precision and Non Precision Flanges B 5 Fig...

Page 17: ... millimeter wave energy Take precautions consistent with ANSI C95 1 1982 a study performed by the American National Standards Institute that sets limits for human exposure to microwave and millimeter wave energy Copies of this publication are available from American National Standards Institute 11 West 42 Street New York New York 10036 Telephone 212 642 4900 WEB site www ansi org CAUTION Do not co...

Page 18: ...tem Qty HP Model or Part Number Power Meter 1 HP 436 437 or 438 Power Sensor 1 HP 8485A 5 16 inch Wrench 1 08555 20097 supplied with HP 85326A T 10 Torx Driver 1 8710 1623 supplied with HP 85326A 1 4 inch Wrench 1 8710 0510 supplied with HP 85325A 3 16 inch Wrench 1 8710 0013 supplied with HP 85325A 3 32 Hex Ball Driver 1 8710 1539 supplied with HP 85325A Adapter 3 5 mm f to f 1 1250 1749 ...

Page 19: ...the procedures in this manual The mm wave head configures the RF source so it will accept mm wave band start and stop frequency commands from the receiver Using an HP 8340 41 RF Source If you are using an HP 8340 41 as an RF source refer to Appendix A for setup information Connecting the Waveguide When connecting the waveguide refer to Appendix B Connecting the Waveguide Properly Use the waveguide...

Page 20: ...he 10 MHz REF OUTPUT produces 0 dBm Checking the Signal You can check to see if a 10 MHz signal is reaching the destination source as follows NOTE This procedure assumes at least one source has a front panel Procedure 1 Set up the sources so that they are not under HP 8530 control 2 Connect the 10 MHz cable between the LO and RF source 10 MHz REF jacks Make sure you use the 10 MHz REF IN on the so...

Page 21: ... amplifier if used b HP 85309A c Receiver NOTE If your LO source is an HP 8350 it is normal for CAUTION NO IF FOUND or CAUTION SOURCE 1 FAILURE RF UNLOCKED to appear on the screen at this time The message will go away later when you connect the reference mixer 4 Press USER PRESET SYSTEM HPIB ADDRESSES SOURCE 2 1 8 x1 sets address of the LO source 5 If using an HP 8510 press TEST SET 3 1 x1 6 If us...

Page 22: ... and it is not connected as shown in Appendix A 8 Press SOURCE 2 INTERNAL PRIOR MENU EDIT MULT SRC 9 Press DEFINE SOURCE 1 MULTIPLIER NUMER 1 x1 10 Press MULTIPLIER DENOM and do one of the following a If source 1 the RF source is an HP 836xx and the source interface cable is connected press 1 x1 b If source 1 is an HP 836xx and the source interface cable is not connected enter the DENOM value for ...

Page 23: ...able 1 3 remember to terminate with x1 14 Press OFFSET FREQUENCY 2 0 MHz DONE 15 Press RECEIVER CONSTANT FREQUENCY 2 0 MHz 16 Press DONE MULT SRC ON SAVE 17 Press STIMULUS MENU POWER MENU POWER SOURCE 1 0 x1 POWER SOURCE 2 1 0 x1 PRIOR MENU STEP 18 Enter the start and stop frequencies using the START and STOP keys Use the start stop frequencies shown in Table 1 2 for your specific mixer Table 1 3 ...

Page 24: ...the mixer LO input port is not damaged by excessive power maximum power for an HP 11970x is 20 dB The maximum unleveled power is possible if the ALC loop of the HP 85309A and reference module is broken To check what the maximum unleveled power level is 1 Disconnect the detector voltage feedback cable at the reference module while monitoring the power level as shown in Figure 1 4 on page 1 11 Perfo...

Page 25: ...e the screws securing the module covers 2 Observe the attenuator that is connected to the reformable cable Hold the body of this attenuator in place with one of the supplied 5 16 inch wrenches 3 Use the other 5 16 inch wrench to disconnect the reformable cable 4 Remove other attenuators as required using this method 5 Place unused attenuators in the holders see Figure 1 2 and Figure 1 3 on page 1 ...

Page 26: ...the connections inside the module are secure before replacing the module covers 8 to 10 in lbs of torque is recommended 8 Replace the module covers and screws Tighten the screws until they are snug Do not over tighten Figure 1 2 Reference Attenuator Installation Figure 1 3 Test Attenuator Installation ...

Page 27: ...going to reconfigure your system between HP 85325A HP 85326A mixers and other mixer types Procedure 2 eliminates the need to readjust LO power when switching between the HP 85325A and other mixers Procedure 1 This procedure applies to systems that only use HP 85325A mixers Initial Setup 1 Zero and calibrate the power meter refer to your power meter manual 2 Determine the power sensor calibration f...

Page 28: ...evel Turn the LO POWER ADJUST knob until the voltage reading matches the value written above To find the maximum unleveled power disconnect the detector voltage feedback cable at the reference module while monitoring the power level as shown in Figure 1 4 on page 1 11 Remember to perform the test within the frequency range of operation NOTE When performing the following step connect the LO IF and ...

Page 29: ...or Test Module 3 The LO power should be between 16 and 17 dBm If the LO power is outside this range you must change the amount of attenuation inside the test module This is accomplished by adding or removing attenuators inside the module Use various combinations of the 1 2 and 4 dB attenuators to adjust the LO power to the required range 4 If you have more than one test module repeat power measure...

Page 30: ...ange you will have to change the LO power whenever you switch between HP 85320A B and HP 85325A mixer systems For HP 85320A B mixers refer to the HP 85320A B Mixer Modules User s Guide Since you must set the LO power separately for each type of mixer adjust the LO power for the millimeter wave mixers at this time To do this perform Procedure 1 starting at Adjusting LO Power to the Reference Mixer ...

Page 31: ...ount of attenuation in the test module until power is between 14 75 and 16 25 dBm NOTE If you have removed all attenuators from the test module and power is still less than 14 75 dBm this means that you cannot switch between the HP 85325A mixers and your other mixers without readjusting LO power each time Perform Procedure 1 on page 1 11 to adjust LO power for the HP 85325A mixers To adjust LO pow...

Page 32: ...age 1 12 2 Press STIMULUS MENU STEP 3 Enter the start and stop frequencies of your millimeter band 4 Make sure averaging is OFF by pressing RESPONSE MENU AVERAGING OFF 5 Measure the a1 input as follows If using an HP 8510 press PARAMETER MENU USER 1 a1 If using an HP 8530 press PARAMETER MENU SERVICE PARAMETERS SERVICE 1 a1 The signal you are measuring is from the coupled arm of the directional co...

Page 33: ...ORY 11 Disconnect the reference mixer from the coupled arm of the directional coupler Put the test mixer in its place as shown in Figure 1 7 NOTE If your system has more than one test channel connect the coupled arm to the first test channel TEST 1 12 Connect the Test LO and Test IF cables to the test module first then to the test mixer Figure 1 7 Test Mixer Connections NOTE Perform steps 13 throu...

Page 34: ...n HP 8350 LO Source Perform the following steps ONLY if using an HP 8350 LO source 1 Press DATA and MEMORY 2 On the rear panel of the HP 85309A a Disconnect the green b2 wire from the TEST IF OUT connector b Move the brown a1 cable from the REFERENCE IF OUT connector to the TEST IF OUT connector 3 Make sure the two displayed traces are within 3 dB of each other This step is required so the receive...

Page 35: ...e Setup NOTE Brackets indicate a front panel key or a computer keyboard Braces indicate a display softkey selection Press SAVE USER PRESET 8 to save the current instrument setup Whenever you press USER PRESET or turn the receiver on the proper settings for this system will be recalled ...

Page 36: ...ect the LO signal cable the LO power will go to maximum while the HP 85309A tries to send the appropriate amount of power to the mixers If you then reconnect the LO cable the LO power to any connected mixer will initially be at damage levels The HP 85309A will detect the high LO power and reduce it but the mixers could be damaged before power is reduced Remember that the HP 85309A sends the same L...

Page 37: ...sing one of these methods a If you are using a coupled reference channel connect the system as shown in Figure 1 9 and Figure 1 10 on page 1 22 b If you are using a radiated reference connect as shown in Figure 1 11 on page 1 23 Refer to Figure 1 1 on page 1 3 for system level connections Figure 1 9 HP 85325A 85326A Installation Block Diagram Coupled Reference ...

Page 38: ...1 22 HP 85325A Operating and Service Manual Installation Final Installation Figure 1 10 HP 85325A 85326A Visual Installation Diagram Coupled Reference ...

Page 39: ...m Radiated Reference If Using an HP 8340 41 RF Source If you are using an HP 8340 41 as an RF source refer to Appendix A for setup information Connecting the Waveguide When connecting a waveguide refer to Appendix B Connecting the Waveguide Properly Use the Waveguide Accessory Hardware Kit when connecting the waveguide components ...

Page 40: ... RFI from the connector interface The amount of torque required depends on the type of connector Table 1 5 lists the proper torque values Do not over tighten connectors Turn ON AC Power Turn ON the AC power for all of the components in the following order 1 RF and LO sources RF power amplifier 2 HP 85309A LO IF unit 3 Receiver Table 1 5 Proper Connector Torque Connector Torque cm kg Torque N cm To...

Page 41: ...r to exceed the damage level of the HP 11970 mixers Electrostatic Discharge When installing the mixers connect the SMA cables to the test reference modules before connecting them to the mixers This will minimize the danger of an electrostatic discharge damaging the mixers NOTE The HP 85325 millimeter wave system is designed to be used with a HP 85310A or HP 85301B Refer to these instrument manuals...

Page 42: ...Bm Maximum LO Input Power No greater than 20 dBm Required LO Power The HP 11970 mixers require 14 to 18 dBm at the LO input Connector Care Leave the plastic waveguide flange cap on whenever the system waveguide connectors are not connected together This protects the mating surface from scratches which can degrade performance Proper Waveguide Connector Alignment If you are using Q U V or W bands wa...

Page 43: ...ption The HP 85325A millimeter subsystem is designed for use with the HP 85309A distributed frequency converter The subsystem in conjunction with the transmit RF source source amplifier and HP 85309A downconverts mm wave frequencies to a 20 MHz IF signal This IF signal is required by the HP 8510 or HP 8530 receiver The frequency range of your millimeter wave system depends on whether you are using...

Page 44: ...guide connectors properly For specified performance of the mm wave source refer to documentation for the RF source module used Table 3 1 R Q and U Band System Level Specifications HP R85325A R Band HP Q85325A Q Band HP U85325A U Band Frequency Range GHz 26 5 to 40 GHz 33 to 40 GHz 40 to 50 GHz 40 to 48 GHz 48 to 60 GHz mm Wave Source Module HP 83554A HP 83555A HP 83556A Max Output Power dBm 1 1 th...

Page 45: ...z W Band mm Wave Source Module HP 83557A HP 83558A Sensitivity dBm S N 1 with 0 averages 78 82 typical 71 74 typical Sensitivity dBm S N 1 with 128 averages 99 103 typical 92 95 typical Dynamic Range dB 0 averages 60 68 typical 56 62 typical Compression Lvl dBm at 0 1 dB 18 15 Channel Isolation dB reference to test 100 100 Typical Match 1 dB 1 At the input of test and reference isolators 9 5 9 5 ...

Page 46: ...rce Model Output Frequency MM Wave Output1 Harmonic Number RF Input Level HP 83554A 26 5 40 GHz 7 dBm 2 17 dBm HP 83555A 33 50 GHz 3 dBm 3 17 dBm H P83556A 40 60 GHz 3 dBm 3 17 dBm HP 83557A 50 75 GHz 3 dBm 4 17 dBm HP 83558A 75 110 GHz 0 dBm 6 17 dBm 1 At 25 C 5 C Table 3 4 MM Wave Mixer Information Mixer Model RF Frequency Range Harmonic Number LO Power Level HP 11970A 26 5 40 GHz 8 16 2 dBm HP ...

Page 47: ...HP 365A 1 4 inch Wrench 1 1 1 8710 0510 3 16 inch Wrench 1 1 1 8710 0013 3 32 Hex Ball Drive 1 1 1 8710 1539 4 40 0 4 inch Screws 50 50 50 3030 0221 4 40 0 5 inch Screws 50 50 50 3030 0209 4 40 Hex Nuts 50 50 50 2260 0002 4 40 Captive Screws 50 50 50 1390 0765 With the HP 85326A T 10 TORX Driver 1 1 1 8710 1623 5 16 inch Wrench 1 1 1 8720 0015 4 dB Attenuator1 1 2 3 0955 0208 1 dB Attenuator2 2 3 ...

Page 48: ...LS and the LR cable the cable that goes between the REF LO OUT of the HP 85309A and the LO IN on the reference module LS source module cable LR reference module cable LT test module cable Refer to Figure 3 1 and Table 3 6 to determine the maximum LS length Figure 3 1 LS LR and LT Cables Table 3 6 Maximum Cable Lengths meters Cable Type LO Frequency max GHz LO Source to HP 85309A LS HP 85309A to HP...

Page 49: ...mum length of the LO cables LR or LT is a function of a the LO power required by the mixers b the LO output power available from the HP 85309A across the LO frequency range 3 to 6 GHz c the loss through other microwave components in the LO path NOTE Test and reference cables must be the same length The output LO power of the HP 85309A is normally greater than 20 8 dBm between 3 and 6 GHz The mixer...

Page 50: ...le is about 1 6 dB The loss associated with either the LR or LT cables cannot exceed 3 2 dB If using an HP 85381A type cable the length should not exceed 5 meters CAUTION The damage level for the HP 11970x mixer is 20 dBm This can occur if the ALC loop is broken and the proper setup procedure was not used for the HP 85325A internal attenuator values ...

Page 51: ...s transmitter verification receiver verification The transmitter verification should be performed first This allows the receiver verification to be run with a transmitter that is known to be within specifications Recommended Test Equipment The following tables list major instruments required for performing the millimeter wave measurement system verification Substitute test instruments can be used ...

Page 52: ...ute HP 5343A opt 001 or opt 002 HP 5351B opt 001 or opt 002 HP 5350B opt 001 or opt 002 with HP IB Power Meter6 No substitute HP 436A 437B 438A Power Sensor6 No substitute HP 8485A or 8481A Oscilloscope9 50MHz bandwidth Connector Adapters Type N and 3 5 mm Various10 3 32 Hex Ball Driver No substitute 8710 1539 supplied with HP 85325A 5 in lb Torque Wrench No substitute 8710 1582 supplied with HP 8...

Page 53: ...commended Model or Part Number Power Meter No substitute Anritsu ML83A for V or U bands only Power Sensor No substitute R band HP R8486A Q band HP Q8486A U band Anritsu ML715A V band Anritsu ML716A W band HP W8486A Fixed Termination1 Return loss 30 dB R band HR R910A Q band HP Q910A U band HP U910A V band HP V910C W band HP W910C Variable Vane Attenuator 0 to 40 dB attenuation R band HP R382A Q ba...

Page 54: ...ve system for verification It is also used to input the system hardware s model and serial numbers CW Frequency Accuracy Checks the frequency accuracy of the transmitter source The Self Test performs the HP 8360 series full self test Maximum Leveled Power Ensures that the RF source and the optional amplifier produce the specified leveled power RF Source Calibration Calibrates the transmitter for u...

Page 55: ...h a 50 ohm load This is not a specified system performance parameter Crosstalk Measures signal leakage between the antenna reference and the test channels This is a specified system performance parameter Compression Measures input power at which the mixers exhibit 0 1 dB compression This is a specified system performance parameter Second Section The second section takes the results of the above se...

Page 56: ...rmance Verification Dynamic Range Results Calculates the dynamic range of the system using Compression IF Noise and RF to IF Conversion measurements from the first section This is a specified system performance parameter See Detailed Test Description on page 4 15 for additional information ...

Page 57: ...e source mode as is used in your system All connectors should be properly torqued refer to Table 4 3 for proper torque specifications CAUTION Never exceed the recommended torque when attaching cables 3 Connect test equipment to the system components as shown in Figure 4 1 on page 4 8 The mixers must be placed near the verification system during the performance verification CAUTION Do not connect t...

Page 58: ...fication system If the cables cannot be pulled they must be tested separately In this case the mixers should be connected to the verification system with a backup set of HP 85381 cables of the same type and length as the cables normally used in the system 4 Turn on all equipment and allow it to warm up for one hour If you cannot bring the mixer down from the antenna tower consider taking the RF so...

Page 59: ...eswitches are set to the Analyzer Mode shown in Table 4 4 The HP 8360A will not work with your antenna measurement system while set to the TMSL mode Turn the HP 8360A OFF then ON to implement the switch change Table 4 4 Switch Positions for Analyzer Mode L3 L2 L1 A5 A4 A3 A2 A1 0 0 1 X X X X X 0 switch down 1 switch up X leave as is ...

Page 60: ...ection This procedure will load the performance verification software onto a hard disk This procedure will take approximately 2 hours to complete Copy Onto a Hard Disk 1 Insert the System Implementation disk into your floppy disk drive 2 You must set the mass storage address to that floppy disk drive For example type MSI 700 1 and press Return 3 Type LOAD HFS_COPY and press Return 4 Press the RUN ...

Page 61: ...ng the corresponding number then pressing Enter NOTE Load the calibration software onto a hard disk Refer Install the Performance Verification Software Onto a Hard Disk on page 10 then continue with the following procedure Loading the Program From a Hard Disk 1 Turn on the computer and load HP BASIC 2 Type MSI ANT_PERF_VER 700 0 or an appropriate hard drive location and press Enter 3 Type LOAD BOO...

Page 62: ... Mark the type of system option that you are using a Standard 1 Test Channel b Opt 001 2 Test Channels c Opt 002 3 Test Channels 9 Use the up down keys to select the appropriate choice 10 Press Mark to make the selection then press Done Running the Tests 1 When the SYSTEMS TEST menu appears perform each test in numerical order Use Next Test to select each test NOTE Tests 2 and 3 are optional if us...

Page 63: ...ed LO Source Timebase Check and Adjustment Maximum Leveled Power Test The maximum leveled power test takes approximately 15 minutes to run This procedure considers the RF source and optional amplifier a single unit Therefore when the procedure refers to the transmitter source or source it is referring to both units connected together In this case when the procedure says to connect the power meter ...

Page 64: ...okup changes required by the operator you are only required to start each test wait for data to be computed print the data and exit each test All the tests are now complete If you have more than one frequency band for this system rerun the program using the other bands NOTE When all tests and frequency bands are tested you can archive the data on the hard disk by copying the test and data subdirec...

Page 65: ...gle unit Therefore when the procedure refers to the transmitter source or source it is referring to both units connected together In this case when the procedure says to connect the power meter to the output of the source you should actually connect the power meter to the output of the amplifier RF to IF Conversion This procedure uses a power meter to calibrate the RF output power from a RF source...

Page 66: ...aken at 51 frequency points First a power level is input to the test mixer that is within its normal operating range The input to reference mixer is set to a much lower level The test mixer output is ratioed to the reference mixer output and the data is put into memory The data is then normalized to give a 0 dB reference Next the input level is increased until the normalized data changes by 0 1 dB...

Page 67: ...recise adjustment interval See the HP 8360 series synthesizer service manual for more information For the best accuracy readjust the 10 MHz timebase oscillator after the LO source and RF source have been ON or in STANDBY for 24 hours After the LO source timebase is adjusted the timebase frequency should stay within the aging rate if the following things happen The timebase oven does not cool down ...

Page 68: ...echanical shock usually appears as a fixed frequency error Procedure 1 Connect the equipment as shown in Table 5 1 Preset all instruments and let them warm up for one hour Figure 5 1 LO Source 10 MHz Timebase Adjustment Setup NOTE If the oscilloscope does not have a 50 ohm input impedance connect channel 1 and the Trig 3 input through a 50 ohm feed through Ensure that an external frequency standar...

Page 69: ...ut Coupling ac Display Display Model Real Time 3 On the oscilloscope adjust the trigger level so that the sweep is synchronized to the synthesizer s internal standard The waveform will appear to drift 4 Using a non metallic tool adjust the LO source s A23 10 MHz standard see Figure 5 2 for minimum horizontal movement of the oscilloscope waveform Figure 5 2 10 MHz Standard Adjustment Location ...

Page 70: ...5 4 HP 85325A Operating and Service Manual Synthesized LO Source Timebase Check and Adjustment ...

Page 71: ... Service Introduction This chapter explains how to find and correct malfunctions in the millimeter wave system This chapter covers the following topics Theory of Operation Recommended Test Equipment Receiver Troubleshooting Replaceable Parts Adjustments ...

Page 72: ... Operation Theory of Operation A millimeter wave antenna measurement system which uses an HP 85309A frequency converter consists of a transmitter and receiver section Figure 6 1 shows the block diagram of the antenna measurement system Figure 6 1 System Diagram ...

Page 73: ...he source responds properly when the receiver asks for frequencies above its normal range The source module accepts RF input power levels from 17 to 27 dBm The power output of the source module can be changed with the STIMULUS controls on the receiver When the SMI cable is used the HP source module produces leveled mm wave power Allowable HP IB Cable Lengths You are allowed 2 meters of cable lengt...

Page 74: ...solators stop mixer harmonic signals from radiating back toward the antennas reducing crosstalk Mixers The HP 8510 or HP 8530 receivers cannot accept RF frequencies directly Mixers are required to downconvert the RF frequencies to a 20 MHz IF frequency The test and reference mixers are identical but are driven by different types of mixer modules Mixer Modules Mixers must receive proper LO power 16...

Page 75: ...nconverted IF frequency is exactly 20 MHz If distance prohibits the timebase connections then adjustments to the LO timebase must be performed periodically Refer to the HP 85310A Operating and Service Manual for instructions NOTE The HP 85310 is a product that contains the HP 85309A along with microwave frequency mixers The HP 85310A manual describes the HP 85309A LO IF unit in great detail Non sy...

Page 76: ... To determine recommended test equipment for each of the mm wave system instruments refer to the manual for that instrument Substitute test instruments can be used if they meet or exceed the Critical Specification shown in Table 6 1 on page 7 and Table 6 2 on page 8 No substitute means you must use the listed device Miscellaneous adapters and cables are also required and may not be listed in the t...

Page 77: ...Must be controlled independently of receiver HP 83640B T Amplifier No substitute HP 8349B I O Controller No substitute HP 9000 series 3004 4 Requires HP BASIC revision 6 0 or higher IP Floppy Disk Drive Double sided high density HP 9122D IP Power Meter No substitute HP 436A 437B for R Q or W bands IP T Power Sensor No substitute HP 8485A or 8481A I P T Connector Adapters type N and 3 5 mm Various5...

Page 78: ...ical Specification Recommended Model or Part Number Use1 Power Meter No substitute Anritsu ML83A for V or U bands Power Sensors2 Return loss 14 dB R band HP R8486A Q band HP Q8486A U band Anritsu ML715A V band Anritsu ML716A W band HP W8486A P T Fixed Termination2 Return loss 30 dB HP x910A3 P T Variable Vane Attenuator2 0 to 40 dB attenuation HP x382A3 V band Millitech DRA 15 W band Millitech DRA...

Page 79: ...e mmW system refer to the Service chapter of the HP 85310A Distributed Frequency Converter Operating and Service Manual Special 5 16 Inch Wrench A specially modified 5 16 wrench is supplied with this product The closed end has been machined to be smaller and has been slotted so it will fit over a cable ...

Page 80: ...t of HP Service Centers on the web at http www hp com go tmdir How to Order Parts If you need to order a replacement part contact you nearest Hewlett Packard representative To order a part that is not listed in the replaceable parts lists include the instrument model number complete serial number the description and function of the part and the number of parts required Address the order to the nea...

Page 81: ... new diplexer make sure the end with the dot is connected to the cable that goes to the LO OUT bulkhead connector Table 6 3 Test Module 85326 60001 Parts Reference Designator Description HP Part Number AT1 4 dB attenuator coax 0955 0208 AT2 2 dB attenuator coax 0955 0301 AT3 1 dB attenuator coax 0955 0321 E1 Adapter SMA m m 1250 1159 J1 Connector RF type N 08340 60221 J2 J3 Connector 3 5 mm bulkhe...

Page 82: ...5326 60002 Parts Reference Designator Description HP Part Number AT1 2 dB attenuator coax 0955 0301 AT2 1 dB attenuator coax 0955 0321 D1 Directional coupler detector 0955 0568 J1 J2 J3 Connector RF type N 08340 60221 J4 J5 Connector 3 5 mm bulkhead 5062 6618 W1 Cable IF through 85325 20006 W2 Cable detector voltage 85325 60004 W3 Cable reformable 85325 20004 W4 Cable LO out 85325 20005 ...

Page 83: ... field serviceable Table 6 5 Parts Supplied in Specific Bands Description Parts Supplied for R Bands Parts Supplied for Q bands Parts Supplied for U bands Parts Supplied for V Bands Parts Supplied for W Bands Directional coupler 0955 0616 0955 0617 0955 0618 0955 0619 HP W752D MM source module1 1 This item can be repaired HP 83554A HP 83555A HP 83556A HP 83557A HP 83558A Mixer1 HP 11970A2 2 Must b...

Page 84: ...Miscellaneous Parts Description HP Part Number Screws captive 1390 0765 Screws 1 2 inch 3030 0209 Screws 3 8 inch 3030 0221 Nut hex 4 40 2260 0002 Nut hex 4 40 2260 00091 RF cable SMA m m 1 m 5061 5458 Wrench 1 4 inch 8710 0510 Wrench 3 16 inch 8720 0013 Torx driver T10 8710 1623 Modified wrench 5 162 08555 20097 Attenuator fixed 10 dB 3 5 mm HP 8493C opt 010 Operating and Service Manual 85325 900...

Page 85: ...P 85325A Operating and Service Manual A 1 Using the HP 8340 41 in Your System A Using the HP 8340 41 in Your System Connect an HP 8340 41 RF source as shown in Figure A 1 Figure A 1 HP 8340 41 RF Source ...

Page 86: ...A 2 HP 85325A Operating and Service Manual Using the HP 8340 41 in Your System ...

Page 87: ...arefully screw together Always connect waveguide in the same flange orientation For example use the label as a reference and always connect a device with the label facing the same direction Wear While connector wear can eventually degrade performance properly connected waveguide flanges experience very little wear and should have a long life Visual Inspection Each time you make a connection inspec...

Page 88: ...recision alignment holes as shown in Figure B 1 below A non precision flange has only the four corner holes Figure B 1 Alignment Holes If you wish to connect two precision flanges refer to Aligning Two Precision Flanges on page 3 If you wish to connect a precision flange to a non precision flange refer to Aligning Precision and Non Precision Flanges on page 5 ...

Page 89: ...Inserting Slip Rings 2 Using the pins as guides carefully align the flanges and insert screws in two opposite corner holes see Figure B 3 below Figure B 3 Align Flanges 3 Place a lock washer and nut on each screw and finger tighten 4 Insert the remaining two screws 5 Place a lock washer and nut on each screw and finger tighten 6 If necessary remove the alignment pins 7 Go to Tighten Flange Connect...

Page 90: ... symmetrical pressure applied as you gradually tighten the screws Inspect Flange Connections Visually inspect a flange connection as follows 10 Place an electric light or white paper behind the connection 11 Check the flange matings for any gap A good connection has no gaps between the connected waveguide flanges and the waveguide walls are flush there is no step or offset 12 Make sure that all fo...

Page 91: ...elow Figure B 5 Align Pin with Head 2 Using the pins as guides carefully align the flanges and insert screws in the two open corner holes 3 Place a lock washer and nut on each screw and finger tighten 4 Remove the alignment pins and insert the remaining two screws 5 Place a lock washer and nut on each screw and finger tighten Tighten Flange Connections 6 In an X pattern for equal compression tight...

Page 92: ...ly inspect a flange connection as follows 7 Place an electric light or white paper behind the connection 8 Check the flange matings for any gap A good connection has no gaps between the connected waveguide flanges and the waveguide walls are flush there is no step or offset 9 Make sure that all four screws are equally torqued NOTE Remember the most common cause of measurement error is a poor conne...

Page 93: ...changing attenuation 1 9 checking reference LO power 1 14 coax torque specifications 1 24 connector proper torque 4 7 proper torque specifications 1 24 connector care 2 2 D denom values see Table 1 2 1 6 description of product 3 1 diplexer replacing 6 11 E electrostatic discharge 2 1 equipment 1 1 band dependent 4 3 initial onfiguration 4 8 non banded 4 2 proper connector torque 4 7 recommended te...

Page 94: ...on 4 5 sensitivity results 4 5 tracking results 4 5 transmitter 4 4 phaselock settings 1 5 power adjusting LO power to test module 1 15 checking reference LO 1 14 LO adjusting if using HP 85325A in conjunction with other mixers 1 14 adjusting if using HP 85325A mixers 1 11 power LO 2 2 product description 3 1 program starting 4 11 proper waveguide connector alignment 2 2 R receiver section isolato...

Page 95: ... 4 7 torque specifications for cables 1 24 transmitter section 6 3 purpose of each device 6 3 U using an HP 8350 LO power source 1 18 using the HP 8340 41 RF source 1 23 V verification CW frequency accuracy 4 4 maximum leveled power 4 4 RF source calibration 4 4 system configuration 4 4 W waveguide accesory hardware kit 1 23 accessory hardware kit 1 3 connecting 1 23 connector alignment 2 2 wavegu...

Page 96: ...Index iv HP 85325A Operating and Service Manual ...

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