Transcription
Agilent Technologies8753ES Option H85
Agilent Technologies8753ES Option H85User’s and Service Guide SupplementThis User’s and Service Guide Supplement is intended for usewith the following documents:Agilent 8753ES Network Analyzer’s User’s GuidePart Number 08753-90472Agilent 8753ES Network Analyzer’s Reference GuidePart Number 08753-90473Agilent 8753ES Network Analyzer’s Service GuidePart Number 08753-90484Agilent 8753E High Power Application Note 1287-6,Publication Number 5966-3319EAgilent Part Number: 08753-90522Printed in USA May 2000
NoticeThe information contained in this document is subject to changewithout notice. Agilent Technologies makes no warranty of any kindwith regard to this material, including but not limited to, the impliedwarranties of merchantability and fitness for a particular purpose.Agilent Technologies shall not be liable for errors contained herein orfor incidental or consequential damages in connection with thefurnishing, performance, or use of this material.Agilent Technologies assumes no responsibility for the use or reliabilityof its software on equipment that is not furnished by AgilentTechnologies.Restricted Rights LegendUse, duplication, or disclosure by the U.S. Government is subject torestrictions as set forth in subparagraph (c)(1)(ii) of the Rights inTechnical Data and Computer Software clause at DFARS 252.227-7013for DOD agencies, and subparagraphs (c)(1) and (c)(2) of theCommercial Computer Software Restricted Rights clause at FAR52.227-19 for other agencies. Copyright 2000 Agilent Technologiesiv
Warranty InformationIMPORTANTCertificationAgilent Technologies certifies that this product met its published specificationsat the time of shipment from the factory. Agilent Technologies further certifiesthat its calibration measurements are traceable to the United States NationalInstitute of Standards and Technology (NIST, formerly NBS), to the extent allowedby the Institute’s calibration facility, and to the calibration facilities of otherInternational Standards Organization members.NOTEThe actual warranty on your instrument depends on the date it wasordered as well as whether or not any warranty options were purchasedat that time. To determine the exact warranty on your instrument,contact the nearest Agilent Technologies sales or service office with themodel and serial number of your instrument. See the list of sales andservice offices in this document.This Agilent Technologies instrument product is warranted againstdefects in material and workmanship for the warranty period. Duringthe warranty period, Agilent Technologies will, at its option, eitherrepair or replace products which prove to be defective.If the warranty covers repair or service to be performed at the Buyer’sfacility, then the service or repair will be performed at the Buyer’sfacility at no charge within Agilent’s service travel areas. OutsideAgilent’s service travel areas, warranty service will be performed atBuyer’s facility only upon Agilent’s prior agreement, and Buyer shallpay Agilent’s round-trip travel expenses. In all other areas, productsmust be returned to a service facility designated by Agilent.If the product is to be returned to Agilent Technologies for service orrepair, it must be returned to a service facility designated by AgilentTechnologies . Buyer shall prepay shipping charges to AgilentTechnologies and Agilent Technologies shall pay shipping charges toreturn the product to Buyer. However, Buyer shall pay all shippingcharges, duties, and taxes for products returned to Agilent Technologiesfrom another country.Agilent Technologies warrants that its software and firmwaredesignated by Agilent Technologies for use with an instrument willexecute its programming instructions when properly installed on thatinstrument. Agilent Technologies does not warrant that the operationof the instrument, or software, or firmware will be uninterrupted orerror-free.v
Limitation of Warranty. The foregoing warranty shall not apply todefects resulting from improper or inadequate maintenance by Buyer,Buyer-supplied software or interfacing, unauthorized modification ormisuse, operation outside of the environmental specifications for theproduct, or improper site preparation or maintenance.NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENTTECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIEDWARRANTIES OF MERCHANTABILITY AND FITNESS FOR APARTICULAR PURPOSE.EXCLUSIVE REMEDIESTHE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE ANDEXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOTBE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHERBASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.vi
Contents8753ES Option H85 OverviewIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. Installation, Control, and SpecificationsInstalling the 8753ES Option H85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2Check the Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2Controlling the Option H85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3Menu Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3Manual Control of the Option H85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3Attenuator Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3R Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3Phase Lock Menu Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4GPIB Control of the Option H85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Attenuator Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Example GPIB Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5R IN Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Example GPIB Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Phase Lock Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-62. Application ConceptsApplication Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2High Power Amplifier Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2High Power Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4Determining Power Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5Additional Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6Selecting Power Ranges and Attenuator Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7Final Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9High Power 2 Port Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11High Power Forward Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-123. Servicing the Option H85 Test SetIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2Adjustment Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3Performing Test 53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4Replaceable Parts and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5Option H85 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7Checking the Option H85 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8Option H85 Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8Major Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8Coupler Bracket Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12RF Rear Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13Installation and Removal Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14Contents-1
ContentsSwitch Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19Deck Assembly Removal or Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21SMA to SMA Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23LED PC Board Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25Coupler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27Coupler Bracket Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31Cable Installation Source and R-Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33Coupler Bracket Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35Cable Installation R-Switch to R-Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37Cable Installation PORT A and PORT B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39PORT 1 and PORT 2 SWITCH to F/R Transfer Switch Cables . . . . . . . . . . . . . . . . . . . 3-41RF IN to F/R Transfer Switch Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43RF OUT to Source Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47RF IN to RF OUT Jumper Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-49Front Panel Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50Option H85 Front View Without Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51Option H85 Bottom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52Option H85 Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53Option H85 Front Bottom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54Contents-2
8753ES Option H85 Overview1
8753ES Option H85 OverviewIntroductionIntroductionThis User’s and Service Guide Supplement contains information that isonly pertinent on the setup, operation, and service of the 8753ESOption H85. This manual supplement is intended to be used inconjunction with the following documents: 8753ES Network Analyzer’s User’s Guide,part number 08753-90472 8753ES Network Analyzer’s Reference Guide,part number 08753-90473 8753ES Network Analyzer’s Service Guide,part number 08753-90484 Using a Network Analyzer to Characterize High Power Components,Application Note 1287-6, Publication Number 5966-3319EIMPORTANTRefer to the 8753ES standard documentation for information oncertification, warranty, safety and regulatory information.2Overview
8753ES Option H85 OverviewOverviewOverviewThe 8753ES Option H85 provides a built-in, high-power capable testset. High power measurements can be made up to 20 watts ( 43 dBm)maximum at each test port. The usable frequency range of theOption H85 is 50 MHz to 3 GHz or 6 GHz with the standard Option 006.Frequencies below 50 MHz are degraded due to the roll-off of thecouplers.The front panel test ports are 3.5mm male. All other front panelconnections are 3.5mm female.The 8753ES Option H85 uses a mechanical transfer switch (A24) toroute the RF signal to Port 1 or Port 2. The inactive port is groundedthrough the transfer switch. Continuous switching is not allowedbetween forward and reverse measurement states.Access to the analyzer’s RF source is located on the rear panel of theanalyzer. These connections are 3.5mm female. This allows an RFamplifier to be connected in the RF source path to increase test portpower.Test port coupler access to the transfer switch is located on the frontpanel. Coupler access allows the user to connect high power circulatorsor isolators to protect the internal transfer switch when making highpower measurements.A and B channel access to the samplers is also located on the frontpanel. Sampler access allows the user to increase the dynamic rangeand lower the noise floor. The maximum power to the A and B samplersis 10 dB. Recommended power to the sampler is –10 dB. Maximumpower to the attenuators is 1 watt ( 30 dBm).The A and B channel attenuators are built into the Option H85 test set.The attenuators may be set with different settings. Once the values areset, they must remain the same for both the forward and reversemeasurements. Once set, they cannot be uncoupled to allow a channelattenuator forward measurement to differ from reverse measurementstate value settings.These variable mechanical attenuators range from 0 to 55 dB in 5 dBsteps. The variable attenuators are used to reduce the power to the Aand B channel samplers. The A and B channel attenuators can either becontrolled manually by the 8753ES display user softkeys or by GPIBsettings. These settings can be saved in instrument states.Do not exceed the maximum power of 10 dBm to the A, B, and RSamplers. If the maximum power is exceeded, damage will occur.Overview3
8753ES Option H85 OverviewOverviewThe R IN port is located on the front panel and allows direct access tothe R–Channel. R IN is used to provide an external reference signalused for ratioing. To ensure optimum power level at the receiver, addany needed attenuation to reduce the power level to –10 dBm. R IN’sexternal maximum power is 10 dBm.The Option H85 default is set to the internal reference channel whenthe instrument is preset or during power on.Control of the internal reference switch is provided using theTESTSET I/O FWD and TESTSET I/O REV display keys and GPIBcommands. A decimal value of seven is for internal and a decimal valueof six is for external.Analyzers equipped with Option H85 can be configured to measure highpower devices. This ability is useful if the required input power for adevice under test is greater than the analyzer can provide, or if themaximum output power from an amplifier under test exceeds the safeinput limits for a standard analyzer.Analyzers equipped with Option H85 are capable of increasing their RFoutput levels by means of inserting an external, high power boosteramplifier. As a result, up to 20 watts ( 43 dBm) can be delivered to adevice or amplifier under test. The maximum test port input power is1 watt ( 30 dBm) CW, but jumpers on the front panel allow theinsertion of high power attenuators or isolators. This allows test deviceoutput levels up to the power limits of the inserted components.4Overview
1Installation, Control, andSpecifications1-1
Installation, Control, and SpecificationsInstalling the 8753ES Option H85Installing the 8753ES Option H85The Option H85 is pre-installed in the test set at the factory. Refer tothe standard 8753ES documentation for complete installationinformation.Check the Shipment1. After you have unpacked your Option H85, it is recommended thatyou keep the original packaging materials so they can be used if yourinstrument needs to be transported.2. Check the items shipped with your Option H85 against the itemslisted in Table 1-1 to make sure that you have received everything.3. Inspect the Option H85 and all accessories for any signs of damagethat may have occurred during shipment. If any of the equipmentappears to be damaged or missing, call your nearest Agilent sales orservice office. Refer to the table at the end of this manualsupplement for the nearest office.Table 1-1Option H85 Accessories SuppliedDescriptionPart NumberQuantityUser’s and Service Guide Supplement08753-905221Application Note5966-3319E11-2Chapter 1
Installation, Control, and SpecificationsControlling the Option H85Controlling the Option H85The following information describes the manual control and the GPIBcontrol of the Option H85.Menu KeysThe following menu keys are only available on the Option H85. Themenu keys are identified as follows:Hardkey – A key located on the front panel and identified by the labelon the key. A hardkey is shown as a bolded word with an initial capitalletter in this document. For example: Configure Menu.Softkey – A key located to the side of the instrument display andidentified by the wording on the display. A softkey is shown as a boldedword in all uppercase letters in this document. For example: TTL OUT.Manual Control of the Option H85Attenuator ControlThe following key entries will control the A and B channel attenuators.Press System, CONFIGURE MENU, OPTION Hxx, CONFIG.Press ATTENUATOR A or ATTENUATOR B.Press the desired decimal value [D], attenuation X 1.R ControlPress Seq, TTL I/O, TTL OUT, TESTSET I/O FWD [D], X 1Press I/O REV, [D], X 1Press desired decimal value [D].6 External7 InternalChapter 11-3
Installation, Control, and SpecificationsControlling the Option H85Phase Lock Menu Keys1. Press System, SERVICE MENU, SERVICE MODES, PPL AUTO OFF or2. Press System, INSTRUMENT MODE, FREQ OFFS MENU, FREQ OFFS ON .With the frequency offset mode on (FREQS OFF ON), the phase lock ofthe Option H85 is turned off.NOTEBanded high power solutions require that the Phase Lock be turned OFFor an error message will be displayed on the LCD display. Phase lockshould be established once a day or before calibration in order tomaintain the analyzer’s integrity.1-4Chapter 1
Installation, Control, and SpecificationsGPIB Control of the Option H85GPIB Control of the Option H85General Purpose Interface Bus (GPIB) and Hewlett-Packard InterfaceBus (HP-IB) are different names for the same command structure.Currently, “HP-IB” is changing to “GPIB”, so some instruments may belabeled “HP-IB” while others are labeled “GPIB”. The format andcommand structure is not affected by this name change.Attenuator ControlThe following GPIB commands will control the A and B channelattenuators:ATTA[D]ATTB[D]Example GPIB CommandOUTPUT 716;”ATTA10”!SET A atten to 10 dBOUTPUT 716;”ATTA20”!SET B atten to 20 dBR IN ControlThe following GPIB commands will control the R-Channel switch:TSTIOFWD[D]TSTIOREV[D]Example GPIB CommandOUTPUT 716;”TSTIOFWD6”;”TSTIOREV6”;!External ControlOUTPUT 716;”TSTIOFWD7”;”TSTIOREV7”;!Internal ControlPhase Lock ControlsThere are no GPIB commands for controlling the phase lock throughthe service modes.Phase lock can be turned off or on by:OUTPUT 716;”FREQOFFSON”!Phase lock offOUTPUT 716;”FREQOFFSOFF”!Phase lock onNOTEBanded high power solutions require that the Phase Lock be turned OFFor an error message will be displayed on the LCD display. Phase lockshould be established once a day or before calibration in order tomaintain the analyzer’s integrity.Chapter 11-5
Installation, Control, and SpecificationsSpecificationsSpecificationsThe specifications in this section apply to the 8753ES Option H85. Forstandard instrument specifications, refer to the standard analyzerdocumentation.Table 1-2 shows the uncorrected instrument specifications for theOption H85.Table 1-2Option H85 Instrument Specifications, UncorrectedUncorrected Performance SpecificationsDescription50 MHz to500 MHz (dB)500 MHz to2 GHz (dB)2 GHz to6 GHz (dB)Directivity303021Source Match161814Load Match262415Reflection Trackinga 3 3 3TransmissionTrackinga 3 3 3Crosstalk7010090a. Excludes rolloff below 840 MHz, which is characteristically –3 dB at 500 MHz, –15 dB at 100 MHz, and –20 dBat 50 MHz.1-6Chapter 1
Installation, Control, and SpecificationsSpecificationsTable 1-3 shows the corrected instrument specification for theOption H85. The specifications listed describe the system performanceof the Option H85 network analyzer. The system hardware includes thefollowing:Table 1-3Calibration Kit85033DCables85131FOption H85 Instrument Specifications, CorrectedCorrected Performance SpecificationsDescription50 MHz to500 MHz (dB)500 MHz to2 GHz (dB)2 GHz to6 GHz (dB)Directivity424238Source Match373731Load Match424238Reflection Tracking 0.005 0.005 .005TransmissionTracking 0.028 0.03 0.096Chapter 11-7
Installation, Control, and SpecificationsSpecificationsTEST PORT INPUTSDescriptionSpecificationOUTPUT POWER aLinearity (25 5 C)–15 to 15 dBm 0.2 dB (relative to 0 dBm outputlevel) 5 to 10 dBm (Standard) 0.2 dB (relative to 0 dBm outputlevel)FREQUENCYFrequency RangeStandard50 MHz to 3 GHzOption 00650 MHz to 6 GHzDamage Level 26 dBm or 6 VdcFrequency Response (25 5 C)50 MHz to 500 MHz 25 dB500 MHz to 800 MHz 5 dB800 MHz to 6 GHz 3 dBFrequency Offset OperationFrequency Range50 MHz to 6 GHzR-Channel Input Requirements0 to –30 dBm, to 3 GHz(required for phase-locked operation)0 to –25 dBm, 3 GHz to 6 GHzExternal Source Mode (CW Time sweep only)Frequency Range50 MHz to 6 GHzR Input RequirementsPower Level1-80 to –25 dBmChapter 1
Installation, Control, and SpecificationsSpecificationsTEST PORT INPUTSDescriptionSpecificationOUTPUT POWER aLinearity (25 5 C)–15 to 15 dBm 0.2 dB (relative to 0 dBm outputlevel) 5 to 10 dBm (Standard) 0.2 dB (relative to 0 dBm outputlevel)Harmonic Measurement Accuracy (25 5 C) 18 dB 50 MHz to 300 MHz 3.5 dB 300 MHz to 3 GHz 3.5 dB 3 GHz to 6 GHz (Option 006 ona. Excludes rolloff below 840 MHz, which is characteristically –3 dB at 500 MHz,–15 dB at 100 MHz, and –20 dB at 50 MHz.Chapter 11-9
Installation, Control, and SpecificationsSpecifications1-10Chapter 1
2Application Concepts2-1
Application ConceptsApplication ConceptsApplication ConceptsHigh Power Amplifier TestingAnalyzers equipped with Option H85 are capable of increasing their RFoutput levels by means of inserting an external, high power boosteramplifier. As a result, up to 20 watts ( 43 dBm) can be delivered to adevice under test (DUT) or amplifier under test. The maximum testport input power is 1 watt ( 30 dBm) CW, but jumpers on the frontpanel allow the insertion of high power attenuators or isolators. Thisallows test device output levels up to the power limits of the insertedcomponents.To protect the analyzer from high power levels, this option allows theaddition of isolators at both test ports and includes internally controlledstep attenuators located between the couplers and samplers.NOTEWhen making high power amplifier measurements, careful planning isrequired and precautions must be observed. For more information onhow to make high power measurements, refer to the chapter on“Making Measurements” in the standard documentation.Figure 2-1 provides the test configuration for setting up the RF Inputusing automatic power meter calibration.Figure 2-1Test Configuration for Setting RF Input usingAutomatic Power Meter Calibration2-2Chapter 2
Application ConceptsApplication ConceptsHigh Power MeasurementsAnalyzers equipped with Option H85 can be configured to measure highpower devices. This ability is useful if the required input power for adevice under test is greater than the analyzer can provide or if themaximum output power from an amplifier under test exceeds safe inputlimits for a standard analyzer. The Option H85 can be set up in thestandard mode of operation. However, in the standard mode ofoperation the Option H85 will not be able to make high powermeasurements.This section provides the following information:1. Initial Setup2. Determining Power Levels3. Additional Setup4. Selecting Power Ranges and Attenuator Settings5. Final Setup6. High Power 2 Port Configuration Example7. High Power Forward Configuration ExampleChapter 22-3
Application ConceptsApplication ConceptsInitial SetupFigure 2-2 shows the initial setup of the Option H85 for making highpower measurements.1. If the analyzer is in the bypass mode configuration, remove thejumper between the RF OUT and RF IN connector on the rear panel.2. Connect the booster amplifier RF INPUT connector to the RF OUTconnector on the rear panel of the analyzer.3. Connect a 20 dB coupler (that operates within the frequency range ofinterest) to the booster amplifier RF OUTPUT connector.Figure 2-2High Power Test Setup2-4Chapter 2
Application ConceptsApplication ConceptsDetermining Power LevelsThe following provides the information needed to determine what thecorrect power levels are and what additional attenuation is needed, ifany.4. Switch on the analyzer and reduce the power level to 20 dBm bypressing Menu, POWER, PWR RANGE AUTO, POWER RANGES, 20 x1.5. Switch on the booster amplifier.6. Using a power meter, measure the output power from the coupledarm and the open port of the coupler.NOTEDepending on the power meter being used, additional attenuation mayneed to be added between the coupler port and the power meter.7. Verify the gain of the booster amplifier. For example, if the analyzeroutput power level was set to 20 dBm and the output powermeasured from the open end of the coupler was 5 dBm, then thegain of the booster amplifier would be 15 dB.8. Verify that the power measured in step 6 is well within theacceptable limits (less than 10 dBm for the coupled arm, less than 43 dBm for the open port).9. Estimate the maximum power level that will be needed to force theDUT into compression.10.At the maximum estimated power level, determine if the maximumoutput power from the coupled arm of the coupler will be higher thanthe acceptable limit. If so, add the appropriate amount ofattenuation that will keep the coupled output power below 0 dBmand above 25 dBm.Chapter 22-5
Application ConceptsApplication ConceptsAdditional SetupFigure 2-3 (rear view) and Figure 2-4 (front view) show how to make theRF amplifier and coupler connections to the Option H85.11.Switch off the booster amplifier.12.Make a connection between the open port of the 20 dB coupler andthe RF IN connector on the rear panel of the analyzer.13.Make a connection between the coupled arm of the 20 dB coupler(along with any added attenuation) and the R-CHANNEL INconnector on the front panel.14.Turn the Phase Lock OFF. Press System, SERVICE MENU, SERVICEMODES, PLL AUTO OFF.Figure 2-3High Power Test Setup (Amplifier and Coupler Connections)Figure 2-4High Power Test Setup (RF IN Connections)2-6Chapter 2
Application ConceptsApplication ConceptsSelecting Power Ranges and Attenuator SettingsThe following information describes how to select the correct powerrange, if an isolator is needed, and what amount of attenuation isneeded. Refer to Figure 2-5 to identify the internal signal paths of theanalyzer.15.Select a power range that will not exceed the maximum estimatedpower level that will force the DUT into compression. For example, ifyour booster amplifier has a gain of 15 dB and the DUT willcompress if supplied with 20 dBm, then you would adjust theanalyzer output power to not exceed 5 dBm by pressing Power,PWR RANGE MAN, POWER RANGES, RANGE 0 15 TO 10.16.Adjust the analyzer power level to be below the maximum limit ofthe power range by pressing 0 (or less) x1.17.Estimate the maximum amount of gain that could be provided by theDUT and, as a result, the maximum amount of power that could bereceived by TEST PORT 2 when the DUT is in compression. Forexample, if a DUT with a maximum gain of 10 dB receives an inputof 20 dBm, then the maximum amount of power that could bereceived by TEST PORT 2 is 30 dBm. If this power level is greaterthan 30 dBm, an isolator is needed to protect the internalmechanical transfer switch.Figure 2-5Internal Signal Path
Agilent 8753ES Network Analyzer’s Reference Guide Part Number 08753-90473 Agilent 8753ES Network Analyzer’s Service Guide Part Number 08753-90484 Agilent 8753E High Power Application Note 1287-6, Publication Number 5966-3319E Agi
