HP 8900D User's Manual
Contents
1. NO CALIFORNIA San Francisco Area Hewlett Packard Canada Ltd Hewlett Packard Benelux NV 333 Logue Ave 6877 Goreway Drive Van Heuven Doedhartlaan 121 Mt View CA 94043 Mississauga Ontario P O Box 667 SO CALIFORNIA Los Angeles Area Canada L4V 1M8 NL Amstelvsen 1134 5400 West Rosecrans Blvd i ITALY Lawndale CA 90260 Hewlett Packard Italiana S p A GEORGIA Via G Di Vittorio 9 UNITED KINGDOM 450 Interstate N Parkway Hewlett Packard Ltd 20063 Cernusco Atlanta GA 30348 A King Street Lane ILLINOIS e IM GB Winnersh Wokingham 5201 Tollview Dr FRANCE Berks RG115AR Rolling Meadows IL 60008 Hewlett Packard France NEW JERSEY Quartier de Courtaboeuf W 120 Century Rd Boite Postale No 5 AFRICA ASIA CENTRAL ARO Paramus NJ 07652 F 91401 Orsay Cedex SOUTH AMERICA A USTRALIA amp ER MA N FEDERAL RE PUBLIC Hewlett Packard Intercontinental Hewlett Packard Australia Ltd Hewlett Packard GmbH 3200 Hiliview Avenue 31 41 Joseph Street Vertriebazentrale Frankfurt Paio Alta CA 94304 Postfach 560 140 D 60009 Frankfurt 56 Blackburn Vietoria 3130 Bernerstrasse 117 Model 8900D Safety Considerations SAFETY CONSIDERATIONS GENERAL This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation This product is a Safety Class I instrument pro vided with a protective earth terminal BEFORE APPLYING POWER Ver2. CD6 Amphenol and Cinch part num ber 57 30500 375 si 2 9 Operating Environment The operating environment should be within the following limitations Temperature risalente 0 to 55 C Humidity lt 95 relative humidity at 40 C Altitude lt 4600 metres 15 000 feet 100 120V 220 240V OPERATION OPERATION gt NSS PLUG NEMA 5 15P PLUG NEMA 6 15P CABLE 8120 1378 CABLE HP 8120 0698 220 240V 220 240V OPERATION OPERATION PLUG BS 1363A The number shown for the plug is the industry identifier for the plug only The number shown for the cable is an HP part number for a complete cable including the plug Figure 2 2 Power Cables Available 2 2 Model 8900D 2 10 Bench Operation The instrument cabinet has plastic feet and folda way tilt stand for convenience in bench operation The plastic feet are shaped to ensure self aligning of the instruments when stacked The tilt stands raise the front of the instrument for easier viewing of the control panel 2 11 STORAGE AND SHIPMENT 2 12 Storage Environment The instrument should be stored in a clean dry environment The following environmental limita tions apply to both storage and shipment Temperature 40 to 75 C Humidity lt 95 relative humidity at 40 C Altitude lt 7600 metres 25 000 feet 2 13 Packaging Original Packaging Containers and materials iden tical to t
3. Hewlett Packard office Keep the shipping mate rials for the carrier s inspection 2 3 PREPARATION FOR USE 2 4 Power Requirements The Peak Power Meter requires a power source of 100 120 220 or 240 Vac 5 10 48 to 66 Hz single phase Power consumption is less than 15 VA 2 5 Line Voltage and Fuse Selection Verify that the line voltage selection card and the fuse are matched to the power source Figure 2 1 provides instructions for line voltage selection Before plugging this instrument into the mains line voltage be sure the correct voltage and fuse have been selected other wise damage can occur to the instrument NOTE The correct fuse rating for the line vol tage is shown on the fuse compartment More information is given in Table 3 1 Power Line Fuse Information 2 6 Power Cable In accordance with international safety standards this instrument is equipped with a three wir power cable When connected to an appropriate ac power receptacle this cable grounds the instrument cabi net The type of power cable plug shipped with each instrument depends on the country of destination Refer to Figure 2 2 or the part numbers of the power cable plugs available WARNINGS Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal will cause a potential shock hazard that could result in personal injury i Grounding one con duc
4. MODE switch to DIRECT Set the READING OFF SET to zero 0 dBortothe appropriate value to com pensate for in circuit attenuation Set the CORRECTION switch to the value ofthe correction factor found on the peak power sensor for the frequency where the measurement is to be taken Set the RANGE switeh to 100 mW If after a read ing has been taken and the power level is less than 10 mW change the RANGE to 10 mW to get better resolution Connect the power sensor to an rf source Read the power level in mW If externa coupling or attenua tion is used set the offset to the amount of in circuit attenuation The Power Meter will then read the power level at the source in mW W or kW See Operating Precautions in the power sensor Operating and Service Manual for maximum power levels which may be safely coupled to this system Levels which exceed the limits may damage the power sensor Power Meter or both Compare Mode i 2 di oR 10 Perform steps 1 and 2 as stated above under DIRECT MODE Set the MODE switch to COMPARE Set the READING OFFSET to zero 0 dB orto the appropriate value to compensate for in circuit attenuation Set the CORRECTION switch to the value of the correction factor found on the peak power sensor for the frequency where the measurement is to be taken l Set the RANGE switch to 100 mW If after a read ing has been taken and the power level is less than 10 mW change the RANGE to 10 mW t
5. 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 programming 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 inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED 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 SPECIAL 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 HEWLETT PACKARD SERVICE OFFICES To obtain servicing information contact the nearest Hewlett Packard Sales and Service Office in HP Catalog or contact the nearest regional office listed below UNITED STATES CANADA NETHERLANDS
6. correction fac tor table printed on its cover To correct for sensor frequency response simply find the power sensor s correction factor at the measurement frequency from the table that is supplied with the power sen sor and set the CORRECTION switch to this value 3 14 Transfer Function of the Diode Current versus Input Voltage At low levels the output current is proportional to the square of the applied voltage At high levels the output current is directly proportional to the input voltage Each diode varies slightly in the precise transfer function uncertainty The Peak Power Meter s response is shaped for the average diode The maximum error for an 84811A diode transfer function is 0 7 dB to 12 GHz 1 00 dB to 18 GHz Transfer uncertainty can be reduced by calibrating the meter and sensor at the frequency and power of interest Meter and sensor are connected to an rf source of known frequency and precise power level at CW The CORRECTION switch is then adjusted until Model 8900D the Peak Power Meter displays the known power level The meter is now calibrated to measure a pulsed signal at the CW frequency and the known power level The transfer uncertainty from CW to pulse is lt 0 2 dB for the Peak Power Meter and 84811A peak power sensor The overall CW to pulse transfer uncertainty must also include the level uncertainty of the CW calibration source the mismatch error between the sensor and CW source and the mi
7. that some of the power fed to the sensor is reflected before it is dissipated in the load Mism atches affect the mea surement in two ways First the initia reflection is simple loss and is called mismatch loss Second the power reflected from the sensor mismatch travels back up the transmission line until it reaches the source There most of it is dissipated in the source impedance but some of it is re reflected by the source mismatch The re reflected power returns to the power sensor and adds to or subtracts from the incident power For all practical purposes the effect the re reflected power has upon the power mea surement is unpredictable This effect is called mismatch uncertainty 3 9 Instrumentation Uncertainty Instrumentation uncertainty describes the ability of the metering circuits to accurately measure the dc output from the power sensor s power sensing device In the Peak Power Meter this error is less than 0 35 dB Itis important to realize however thata 0 35 dB meter does not automatically give 0 35 dB overall measurement accuracy T 3 10 Specified Uncertainties The specified uncertainties which account for part of the total power measurement uncertainty are a 8900D instrumentation uncertainty Meter Cw Transfer Accuracy Accuracy CW to Pulse Direct 0 35 dB Compare 0 25 dB b 84811A calibration uncertainty 10 to 40 C 0 7 dB 0 1 GHz to 12 GHz 1 0 dB 12 GHz to 18 G
8. 1 INTRODUCTION This manual contains operating and service in formation for the Hewlett Packard Model 8900D Peak Power Meter The Peak Power Meter is shown in Figure 1 1 with all of its externally sup plied accessories This section of the manual describes the instru ments documented by this manual and covers instrument description specifications and other basic information The other sections provide the following Section IT Installation Section III Operation Section IV Performance Tests Section V Adjustments Section VI Replaceable Parts Section VII Manual Changes Section VIII Service Listed on the title page of this manualisa Micro fiche part number This number can be used to order 4 x 6 inch microfilm transparencies of the manual Each microfiche contains up to 96 photo duplicates of the manual s pages The microfiche package also includes the latest Manual Changes supplement as well as all pertinent Service Notes 1 2 SPECIFICATIONS Instrument specifications are listed in Table 1 1 These specifications are the performance stand ards or limits against which the instrument can be tested 1 3 INSTRUMENTS COVERED BY MANUAL Thisinstrumenthasa two part serial number The first four digits and the letter arethe serial number prefix which identifies the instrument configura tion The last five digits form the suffix that is unique to each instrument The contents of this manua
9. EADING OFFSET com pensates the Peak Power Meter reading for exter nal couplers or attenuators to indicate the true power at the source The am unt of external atte nuation is indicated on the slide switch The READING OFFSE T does not allow the Operator to read higher power levels The maximum power level is determined by the Power sensor For additional information refer to the power sensor manual COMPARE LEVEL When in compare mode the COM PARE LEVEL is used to measure power at user selected points on the pulse waveform This is accomplished by adjusting the COMPARE LEVEL which in turn moves a reference line up or down on the pulse waveform as seen on an oscillo scope O MODE switch Selects either DIRECT or COMPARE mode In DIRECT mode the meter automatically displays the maximum rf power with no user adjustments and no external instruments In COMPARE mode the meter is disconnected from the peak detecting circuit and instead indicates Power corresponding to the position of a reference line O une switch Connects the line power to the Power Meter circuits when the LINE switch is on The lamp contained within the LINE switch will be illuminated when the instrument is on Both sides of the mains line goes through the switch O VIDEO OUTPUT Provides detected input signal and reference line used in compare mode Not linear with power Nominal impedance 500 BNC con nector Typical output voltage for 1 mW input is 80 m
10. Hz 0 10 C and 40 55 C add 0 2 dB 3 11 Caiculating Mismatch Uncertainty Mismatch uncertainty is the result of the source mismatch interacting with the power sensor mis match The magnitude of uncertainty is related to the magnitudes of the source and power sensor reflection coefficients which can be calculated from 31 Operation Calculating Mismatch Uncertainty Cont d SWR Figure 3 6 shows how the calculations are made and Figure 3 7 illustrates mismatch uncer tainty and total calculated uncertainty for two cases In the first case the power sensor s SWR is 1 5 and in the second case the power sensor s SWR is 2 0 In both cases the source has an SWR of 2 0 The example shows the effect on power measure ment accuracy a poorly matched power sensor will have as compared to one with low mismatch A faster easier way to find mismatch uncertainty is to use the HP Mismatch Error uncertainty Limits Reflectometer Calculator The calculator may be obtained on request from your nearest Hewlett Packard office by using HP part number 5952 0948 The method of calculating measurement uncer tainty from the uncertainty in dB is shown by Fig ure 3 8 This method would be used when the initial uncertainty calculations were made with the Mis match Error Reflectometer Calculator 3 12 CORRECTIONS FOR ERROR 3 13 Correction Factor The peak power sensor used with the Peak Power Meter has an individually calibrated
11. OPERATING AND SERVICE MANUAL 89000 PEAK POWER METER SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 2131 A For additional important information about serial numbers see INSTRUMENTS COVERED BY MANUAL in Section I HEWLETT PACKARD Copyright HEWLETT PACKARD COMPANY 1981 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A MANUAL PART NUMBER 08900 90224 Microfiche Part No 08900 90225 Printed FEBRUARY 1982 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 This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period ofone year from date of shipment During the warranty period Hewlett Packard Company will at its 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 shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping
12. V De coupled O TRIGGER OUTPUT Provides the trigger signal for the test oscilloscope Typical output voltage gt 0 1V peak Nominal impedance 500 BNC connector sensor Input Five pin lock ring connector which serves as the input to the Power Meter from the power sensor This connector also serves as the supply for the plus and minus five 5 volts to the sensor O RANGE switch Sets the range of the Power Meter to either 10 mW or 100 mW maximum range 10 CORRECTION switch Used to set the correction factor of the frequency where the measurement is to be taken The correction factor data versus freq uency is found on the peak power sensor Figure 3 1 Front Panel Controls Indicators and Connectors Operation Model 8900D BED OUTPUT The front panel reading is reproduced 2 Window Safety interlock fuse cannot be removed in BCD format Binary Coded Decimal The BCD while power cable is connected to Power Meter output is useful for remote monitoring of the meter reading The TTL level for a 1 is typically gt 3 5 Fuse Refer to Table 3 1 for values 1V and a 0 is typically lt 0 2 0 4V Fuse Pull Handle Mechanical interlock to guarantee BGB pen at d5 fuse has been removed before line voltage selec tion card can be removed ay Decimal Line Voltage Selection Card Matches transformer pri LACIE mary to available line voltage si O Receptacle For power cable connection to available line v
13. afety information for installation operation and servicing is found in appropriate places throughout this manual Model 8900D General Information Table 1 3 Recommended Test Equipment 1 of 2 instrument Type Critical Specifications Suggested Modet ue Digital Voltmeter 0 1 mV Resolution amp Accuracy HP 3455A A 10 Volt Range L i A P Pulse Generator Square wave 0 5V P P 1 kHz Repetition HP 8013B Rate Rise time 35 ns maximum Power Supply Regulation load effect 5 mV HP 6203B A Source effect 3 mV Range 0 1 5V minimum Periodic and Random Deviation 200 uV rms 500 Potentiometer i HP 2100 0671 Mainframe erre ES Teo Microwave Amplifier Full band pavers to 18 GHz or Frequency HP 489A 491C ST 495A of interest 200 mW output HP 11692D u Power Sensor 0 1 18 GHz 1 mW to 100 mW HP 8481 A Coaxial Attenuator 10 dB attenuation HP 8491B 2W Opt 010 100W peak Coaxial Step 0 1 18 GHz l HP 8494B Attenuator 1 dB step 11 dB total Power Splitter De 18 GHz 0 5W input HP 11667A MES P 20 dB attenuation on reflected and incident ports 2 18 GHz frequency gt 26 dB directivity Dual Directional Coupler 0 118 GHz 0 1 mW 3W HP 8481H 100W Peak Coaxial Crystal HP 8470B Detector g 0 1 18 GHz 0 5 mV uW minimum 200 mW input P Performance A Adjustments T Troubleshootin General Information M
14. e i 2 Remove the Line Voltage Selection Card Position the card so the line voltage appears at top left corner Push the card firmly into the stat Rotate the FUSE PULL lever to its normal position Insert a fuse of the correct value in the holder Close the cover door WARNING Do not operate this instrument with frequencies greater than 66 Hz Line frequencies greaterthan 66 Hz with line voltages greater than 126 5 Vac will cause a potential shock hazard that could result in personal injury leak age current at these settings may exceed 3 5 mA In addition damage to the instrument may result Figure 2 1 Line Voltage Selection 220 240V 220 240V _ OPERATION OPERATION 7 es SS RR un R a XA Ss Q SS PLUG SEV 1011 1959 24507 TYPE 12 PLUG NZSS 198 AS C112 CABLE HP 8120 2104 CABLE HP 8120 1369 220 240V OPERATION PLUG CEE VII PLUG CEE22 V1 CABLE HP 8120 1689 CABLE HP 8120 1860 CABLE HP 8120 1351 Model 8900D 2 7 Interconnections The Power Meter and a power sensor are integral parts of this measurement system Before mea surements can be performed the Power Meter and sensor must be connected together with the power sensor cable 2 8 Mating Connectors Mating connectors used with the Peak Power Meter should be one of the following 1 50 ohm type BNC male 2 Five pin lock ring male 3 50 pin micro ribbon male The part number for the 50 pin connector is HP 1251 0086
15. hose used in factory packaging are availa ble through Hewlett Packard offices If the instru ment is being returned to Hewlett Packard for servicing attach a blue tag found at the back of thismanual indicating the type of service required return address model number and full serial number Also mark the container FRAGILE to Installation assure careful handling In any correspondence refer to the instrument by model number and full serial number Other Packaging The following general instruc tions should be used for re packaging with commer cially available materials a Wraptheinstrumentin heavy paper or plas tic If shipping to a Hewlett Packard office or service center attach a blue tag indicating the type of service required return address model number and full serial number b Use a strong shipping container A double wall carton made of 350 pound test material is adequate c Use enough shock absorbing material 3 to 4 inch layer around all sides of the instrument to provide a firm cushion and prevent movement inside the container Protect the control panel with cardboard d Seal the shipping container securely e Mark the shipping container FRAGILE to assure careful handling 2 3 2 4 w Model 8900D Operation SECTION Ili OPERATION 3 1 INTRODUCTION This section describes the functions of the controls and indicators of the Peak Power Meter I
16. ify that the product is set to match the avail able line voltage and the correct fuse is installed SAFETY EARTH GROUND An uninterruptible safety earth ground must be provided from the main Power source to the pro duct input wiring terminals power cord or sup plied power cord set WARNINGS Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal will cause a potential shock hazard that could resultin personal injury Grounding one conductor of a two conductor outlet is not sufficient protection In addition verify that a common ground exists between the unit under test and this instrument prior to energizing either unit Whenever itis likely that the protection has been impaired the instrument must be made inoperative and be secured against any unintended operation If this instrument is to be energized via an auto transformer for voltage reduction make sure the common terminal is connected to neutral that is the grounded side of the mains supply Servicing instructions are for use by service trained personnel only To avoid dangerous elec tric shock do not perform any servicing unless qualified to do so Adjustments described in the manual are per formed with power supplied to the instrument while protective covers are removed Energy avail able at many points may if contacted result in personal injury Capacitors
17. inside the instrument may still be charged even if the instrument has been discon nected from its source of supply For continued protection against fire hazard re place the line fuse s only with 250V fuse s of the same current rating and type for example normal blow time delay etc Do not use repaired fuses or short circuited fuseholders SAFETY SYMBOLS N Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the in struction manual see Table of Contents for page references Indicates hazardous voltages tp Ww Indicates earth ground terminal The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in per sonal injury Do not proceed be yond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure practice or the like which if not correctly performed or adhered to could result in damage to or destruc tion of part or all of the product Do not proceed beyond a CAU TION sign until the indicated conditions are fully understood and met General Information Model 8900D MODEL 8900D POWER CORD i Figure 1 1 8900D Peak Power Meter Model 8900D General Information SECTIONI GENERAL INFORMATION 1
18. l apply directly to instruments having the same serial number prefix es as listed under SERIALN UMBERS on the title page An instrument manufactured afterthe printing of this manual may have a serial number prefix that is not listed on the title page This unlisted prefix indicates that the instrument is different from those documented in this manual The manual for this instrumentis supplied with a Manua Changes supplement that contains change information that documents the differences In addition to change information the supple ment may contain information for correcting er rors in the manual To keep this manual as current and accurate as possible Hewlett Packard recom mends that you periodically request the latest Manual Changes supplement The supplement for this manual is keyed to this manual s print date and part number both of which appear on the title page Complimentary copies of the supplement are available from Hewlett Packard For information con cerning a serial number prefix not listed on the title page or in the Manual Changes supplement contact your nearest Hewlett Packard office eyes Table 1 1 Specifications 1 of 2 _ Frequency range 100 MHz to 18 GHz Dynamic range 20 dB 0 to 20 dBm Range 2 ranges of 10 and 100 mW full scale Operating Temperature 0 to 55 C Pulse Respanse Direct Mode Pulse width 1 us to CW Repetition rate 100 Hz to 100 kHz Compare mode Pulse width mi
19. nimum width limited by rise time Repetition rate O to 100 kHz Rise time 75 ns Fall time 125 ns as measured on video output Meter Transfer Accuracy Accuracy CW to Pulse 0 35 dB 0 25 dB Direct Compare 3 Specifications only apply in combination with specifications of 84811A sensor 2 Does not include errors due to source harmonics 3 Error in reading pulsed power when meter is first calibrated with a known CW level Eliminates sensor calibration error Mismatch errors and oscilloscope errors are not included General Information Table 1 1 Specifications 2 of 2 General l Suppiy 100 120 220 or 240 Vac 5 10 48 to 66 Hz Power 15W 15 V A maximum 6 5W typical Weight net 2 7 kg 6 1b Dimensions 165H x 130W x 292 mmD 6 5 x 5 1 x 11 5 in Tabie 1 2 Supplemental Characteristics Recorder output 0 1 Vdc linearly proportional to the indicated power on each range Output imped ance 1 kN BNC connector Video output provides detected input signal and ref erence line used in compare mode Not linear with power Nominal impedance 500 BNC con nector Typical output voltage for 1 mW input 30 mV de coupled Scope trigger output provides trigger signal for test oscilloscope Typical output voltage gt 0 1V Nominal impedance 500 BNC connector 1 4 DESCRIPTION The Hewlett Packard Model 8900D Peak Power Meter directly displays the peak
20. o get better resolution Connect the TRIGGER OUTPUT to the external trigger of an oscilloscope Connect the VIDEO OUTPUT to the vertical input of a de coupled oscilloscope Connect the power sensor to anrfsource Read the power level in mW If externa coupling or attenua tion is used set the offset to the amount of in cireujt attenuation The Peak Power Meter will then read the power level at the source in mW W or kW Adjust the scope for a clear display of the pulse waveform and the reference line Itis now possible to measure power at any point on the pulse waveform Adjust the COMPARE LEVEL to move the reference line as seen on the scope to the position on the pulse waveform thatis of interest The Power Meter will then display the power at that point Figure 3 4 Operating Instructions 3 0 3 6
21. odel 8900D Table 1 3 Recommended Test Equipment 2 of 2 Instrument Type Critical Specifications Suggested Model Use Pulse Modulator 2 18 GHz HP 11720A Rise and fall time lt 10 ns HP 3437A System Voltmeter 0 001V resolution 1 0V full scale Settling time 1 5 us Delay 0 1 us Low Pass Filter Cut off frequency in GHz 2 8 HP 11688A 4 4 HP 11689A 6 8 HP 11684A 9 5 HP 11685A 13 0 HP 11686A P Performance A Adjustments T Troubleshooting 1 4 Model 8900D Installation SECTION li INSTALLATION 2 1 INTRODUCTION This section provides information about incoming inspection selecting the input line voltage operat ing environment and information applicable to bench mounting 2 2 INITIAL INSPECTION Inspect the shipping container for damage If the shipping container or cushioning material is dam aged it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electrically The contents of the shipment are shown in Figure 1 1 and the procedures for checking elec trical performance are given in Section IV If the contents are incomplete if there is mechanical damage or defects or if the instrument does not pass the electrical performance test notify the nearest Hewlett Packard office If the shipping con taineris damaged orthe cushioning material shows signs of stress notify the carrier as well as the
22. oltage Power Module Assembly RECORDER CUTPUT 0 1 Vdc linearly proportional to the indicated power on each range Output i impe dance 1 kN BNC connector ARRE 0 0 0 0 0 0 0 0 1 1 COD m bm we em OO OO O oF FO G HM mo 0 Connector J5 is found on service sheet 3 Figure 3 2 Rear Panel Features Model 8900D BEFORESWIT Operation OPERATING INSTRUCTIONS CHING ON THISIN STRUMENT check that the power transformer primary is matched to the available line voltage the correct fuse is installed and safety precautions are taken See Power Requirement Line Voltage Selection Power Cables and associated warnings and cautions in Section IT WARNING BEFORE CONNECTING LINE POWER TO THE INSTRUMENT ensure that all devices connected to this instrument are connected to the protective earth ground BEFORE SWITCHING ON THIS INSTR UMENT ensure that the line power Mains plug is connected to a three conductor line power outlet that has a protective earth ground Grounding oneconductor of a two conductor outlet is not sufficient Do not twist the body of the power sensor when connecting or dis connecting it This can cause major damage to the sensor Direct Mode 1 Connect the power sensor to the Power Meter with the power sensor cable Connect the power cable to the power outlet and power module receptacles Set the LINE switch to ON the lamp within the switch lens should be lit Set the
23. power of RF pulses over a 100 MHz to 18 GHz frequency range Measurements can be made on pulses with widths from 1 us 100 ns in COMPARE mode to CW and repetition rates from 100 Hz 0 Hz in COMPARE mode to 100 kHz The dynamic range of the 8900D is 20 dB 0 to 20 dBm 1 2 Model 8900D The 8900D has two modes of operation DIRECT and COMPARE In the DIRECT mode the Power Meter automatically captures and displays the peak power of the pulse In the COMPARE mode an oscilloscope is used with the 8900D to measure power at any desired point on the pulse waveform 1 5 WARRANTY The Peak Pawer Meter is warranted and certified as indicated on the inner front cover of this man ual For further information contact the nearest Hewlett Packard Sales and Service office ad dresses are provided at the back of this manual 1 6 TEST EQUIPMENT REQUIRED Table 1 3 lists the test equipment and accessories required to check adjust and repair the Peak Power Meter If substitute equipment is used it must meet the listed critical specifications 1 7 SAFETY CONSIDERATIONS This product is a Safety Class I instrument pro vided with a protective earth terminal The Peak Power Meter and all related documentation must be reviewed for familiarization with safety mark ings and instructions before operation Refer to the Safety Considerations page found at the begin ning of this manual for a summary of general safety information S
24. s match error between the sensor and pulsed rf source 3 15 OPERATOR S MAINTENANCE CAUTION Be sure to select the correct fuse rating for the selected line voltage see LINE VOLT AGE SELECTION in Section Il and Power Line Fuse information in Table 3 1 3 16 Power Line Fuse The main ac line fuse is located on the rear panel next to the line power cable jack To remove the fuse first remove the line power cable from its jack Slide the fuse compartment cover to the left then pull the handle marked FUSE PULL and remove the fuse See Table 3 1 for replacement fuse information Table 3 1 Power Line Fuse information n men u HP Part Number l 100 120V ASA 250V 200 240V 1A 250V 21100320 2110 0234 3 17 Lamp Replacement The lamp is contained in a plastic lens sia dou bles for a pushbutton on the LINE switch When the Power Meter LINE switch is ON and is being oper ated by the available line power the lamp should be illuminated If the lamp is defective remove the lens by pulling it straight out Order lamp 3131 0434 CD6 and replace the old pushbutton lamp assembly with the new one To replace the assem bly align the pins with the notch in the receptacle and push straight in Model 8900D Operation Dd Digital Panel Meter Normally indicates peak rf power in mW Power can be displayed in watts and kilo watts when the READING OFFSET is used O READING OFFSET dB The R
25. t describes how to set the front and rear panel controls and covers such operator maintenance as fuses and indicator lamp replacement 3 2 PANEL FEATURES Front panel controls indicators and connectors are shown and described in Figure 3 1 Rear panel con trols and connectors are shown and described in Figure 3 2 3 3 OPERATOR S CHECKS Use the operator s checks in Figure 3 3 to verify Proper operation of the Peak Power Meter s main functions 3 4 OPERATING INSTRUCTIONS Figure 3 4 explains how to use the Peak Power Meter 3 5 POWER MEASUREMENT ACCURACY A power measurement is never free from error or uncertainty Any RF system has RF losses mis match losses harmonics mismatch uncertainty instrumentation uncertainty and calibration un certainty Measurement errors as high as 50 are not only possible they are highly likely unless the error sources are understood and as much as possi ble eliminated 3 6 SOURCES OF ERROR AND MEASURE MENT UNCERTAINTY l 3 7 RF Losses Some of the RF power that enters the power sensor is not dissipated in the power sensing elements This RF loss is caused by dissipation in the center conductor of coaxial power sensors in the dielectric of capacitors in radiation losses and connections within the sensor diode caused by shunt conduct ance and junction capacitance 3 8 Mismaich The result of mismatched impedance between the device under test and the power sensor is
26. tor of a two conductor outlet is not suffi cient protection In addition verify that a common ground exists between the unit under fest and this instrument prior to energizing either unit i Whenever it is likely that the protection has been impared the instrument must be made inoperative and be secured against any unin tended operation If this instrument is to be energized via an auto transformer for vol tage reduction make sure the common terminal is connected to neu tral that is the grounded side of the mains supply Servicing instructions are for use by service trained personnel only To avoid dangerous electric shock do not perform any servicing unless qualified to do so Adjustments described in the manual are per formed with power supplied to the instrument while protective covers are removed Energy available at many points may if contacted result in personal injury Capacitors inside the instrument may still be charged even if the instrument has been dig connected from its source of supply For continued protection against fire hazard replace the line fuse s only with 250V fuse s of the same current rating and type for exam ple normal blow time delay etc Do not use repatred fuses or short circuited fuseholders 2 1 Installation Operating voltage is shown in module window SELECTION OF OPERATING VOLTAGE 1 Open cover doar pull the FUSE PULL lever and rotate te left Remove the fus
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