HP 423a User's Manual
Contents
1. OPERATING AND SERVICE MANUAL Ta A A Wa TE AA A A rs oooh ont ae 423A 8470A CRYSTAL DETECTOR HEWLETT PACKARD Printed JULY 1976 Hewlett Packard Co 1976 VOL08 dH YEZH dH Page 2 1 GENERAL INFORMATION 2 This manual contains operating instructions for the Hewlett Packard Model 423A and 8470A Crys tal Detectors Included in the manual is the inform ation required to install and test the crystal detectors 3 On the rear cover of this manual below the manual part number is a Microfiche part num ber This number may be used to order a 4 x 6 inch microfilm transparency of the manual 4 Specifications 5 Instrument specifications are listed in Table 1 These specifications are the performance standards or limits against which the instrument may be tested 6 Description 7 The Hewlett Packard Model 423A and 8470A Crystal Detectors are 502 nominal devices de signed for measurement use in coaxial systems The instruments convert RF power levels applied to the 50Q input connector into proportional values of de voltage The instruments measure relative power up to 100 mW and have a BNC female connector for the output jack which allows the detected out put to be connected to aSWR meter The output voltage polarity is negative unless Option 003 is selected The frequency range of the 423A is 10 MHz to 12 4 GHz The 8470A s frequency range extends from 10 MHz to 18 GHz 82. KINGDOM Hewlett Packard Ltd King Street Lane GB Winnersh Wokingham Berks RGL1 5AR AFRICA ASIA CENTRAL AND SOUTH AMERICA Hewlett Packard Intercontinental 3200 Hillview Avenue Palo Alto CA 94304 HEWLETT PACKARD Manual Part Number 00423 90019 Microfiche Part Number 00423 90021 Printed in U S A
3. 03 00423 800 00423 801 00423 605 00423 606 00423 603 00423 604 1250 0045 1250 0251 5000 0234 5020 3215 1250 0816 1250 0820 1250 0907 1250 1183 1250 1465 5040 0306 Description 8470A APC 7 Connector Assembly Cont d Tools APC 7 Contact Extractor APC 7 Spanner Wrench Open end Wrench 8470A Assembly Resistor Tubular Ring RF Connector Opt 012 Connector Female BNC Connector RF APC N Female Opt 013 Contact RF Connector Female Opt 013 Connector RF APC N Male Opt 012 Contact RF Connector Male Opt 012 Nut RF Connector Opt 012 Washer Lock Internal Contact Spring Cap Connector Insulator Washer Compression Washer Fiber Body Crystal Mount Conductor Center 8470A Diode Replacement Assemblies Single Diode Negative Polarity Single Diode Positive Polarity Opt 003 Single Diode Negative Polarity with Matching Load Resistor Opt 002 Single Diode Positive Polarity with Matching Load Resistor Opt 002 003 Matched Pair Diodes Negative Polarity Opt 001 Matched Pair Diodes Positive Polarity Opt 001 003 Matched Pair Diodes with Load Resis tor Negative Polarity Opt 001 002 Matched Pair Diode with Load Resistor Positive Polarity Opt 001 002 and 003 li efer to Table i for description of options 2 Part of HP Model 115914 APC 7 Connector Tool Kit Page 9 Stock No 5060 0236 5060 0237 8710 0877 0727 1033 1250 0016 1250 0251 1250 0914
4. 1 for all frequencies of interest across the band NOTE Multiple mismatch errors caused by atten uator SWR power meter SWR and detec tor SWR should be taken into account as well as the accuracy of the indicator used to measure the detector s output Page 5 33 High Level Sensitivity Test a Using signal sources covering 10 MHz to 18 GHz and a dc voltmeter or oscilloscope as the indicator connect detector to signal source Ad just RF power level for a 100 mV detected output from detector b Disconnect detector from signal source and measure RF output level The RF output level should be lt 0 35 mW c Repeat steps a and b for all frequencies of interest across the band 34 Low Level Sensitivity Test a Using a signal source covering 100 MHz to 1 GHz a 10 GB attenuator and a power meter connect attenuator to signal source and power sen sor to attenuator Adjust RF power level for 20 dBm output from attenuator Verify the am bient temperature b Disconnect power sensor from attenuator and connect detector Measure dc voltage output from detector The output should be gt 4 0 mV at 25 C The sensitivity slope is typically 0 015 dB C from 0 C to 55 C NOTE Multiple mismatch errors caused by atten uator SWR power meter SWR and detec tor SWR sould be taken into account as well as accuracy of indicator used to meas ure detector s output 35 Match Test SWR 86 To verify the d
5. 1250 0915 1250 0916 1250 0917 1250 0918 2190 0016 5000 0234 5020 0210 5040 0306 08470 0001 08470 0002 08470 2000 08470 2001 08470 6001 08470 6002 08470 6003 08470 6004 08470 6005 08470 6006 08470 6007 08470 6008 Page 10 Y f k ae g u g ka ik N sill ku kl HA A ki Ne Model 423A 8470A No CENTER CONDUCTOR SUPPORT BEAD INNER CONDUCTOR CONTACT MECHANISM OUTER CONDUCTOR COUPLING NUT COUPLING SLEEVE USE To Connect 1 On one connector retract the coupling sleeve by turning the coupling nut counterclockwise until the sleeve and nut disengage On the other connector fully extend the coupling sleeve by turning the coupling nut clockwise To engage coupling sleeve and coupling nut when the sleeve is fully retracted press baek lightly on the nut while turning it clockwise Push the connectors firmly together and thread the coupling nut of the connector with retracted sleeve over the extended sleeve Ciose the gap between coupling nuts with the nut on the extended sleeve connector To Disconnect 1 Loosen the coupling nut of the connector showing the wider gold band WIDER BAND 2 IMPORTANT Part the connectors carefully to pre vent striking the inner conductor contact CARE Keep contacting surfaces smooth and clean Irreg ularities and foreign particles can degrade electrical performance COUPLING NUT INNER CONDUCTOR CONTACT COUPLING SLEEVE Prote
6. ES 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 NO CALIFORNIA San Francisco Area 383 Logue Ave Mt View CA 94043 SO CALIFORNIA Los Angeles Area 5400 West Rosecrans Blvd Lawndale CA 90260 GEORGIA 450 Interatate N Parkway Atlanta GA 30348 ILLINOIS 5201 Tollview Dr Rolling Meadows IL 60008 NEW JERSEY W 120 Century Rd Paramus NJ 07652 AUSTRALIA Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 CANADA Hewlett Packard Canada Ltd 6877 Goreway Drive Mississauga Ontario Canada L4V 1M8 ITALY Hewlett Packard Italiana S p A Via G Di Vittorio 8 20063 Cernusco Sul Naviglio MD FRANCE Hewlett Packard France Quartier de Courtaboeuf Boite Postale No 6 F 91401 Orsay Cedex GERMAN FEDERAL REPUBLIC Hewlett Packard GmbH Vertriebazentrale Frankfurt Bernerstrasse 117 Postfach 560 146 D 6000 Frankfurt 56 NETHERLANOS Hewlett Packard Benelux N V Van Heuven Doedhartlaan 121 P O Box 67 NL Amstelveen 1134 UNITED
7. Options 9 The 423A and 8470A Crystal Detectors are available with the following options see Table 1 for further descriptions Option 001 Matched pair of detectors Option 002 Furnished with matched load re sistor HP 11523A for optimum square law characteristics Option 008 Positive polarity output Option 012 Furnished with stainless steel type N male connectors 8470A only Option 018 Furnished with stainless steel type N female connectors 8470A only Model 423A 8470A 10 INSTALLATION 11 Initial Inspection 12 Inspect the shipping container for damage If the shipping container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electrically 13 The procedures for checking electrical perfor mance are given under PERFORMANCE TESTS If the contents are incomplete if there is mechanical damage or defect or if the instrument does not pass the electrical performance test notify the nearest Hewlett Packard office If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping materials for the carrier s inspection The HP office will arrange for repair or replacement at HP s option without wait ing for claim settlement 14 Mating Connectors 15 The 8470A standard RF input connec
8. Y This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will 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 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 WARRANTV The foregoing warranty shall not apply to defects resulting from i 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 REMEDI
9. aged if the detector element is not centered d Replace connector cap and TIGHTEN FIRMLY NOTE The Option 002 Detector Element Assem bly includes a detector element and a re sistor The resistor is for use in the Model 11523A and must be installed to match it to the detector 48 Replacement of Load Resistor 11523A Parts 49 Parts mentioned in the following procedure are identified in Figures 2 and 3 50 Replacing Male BNC Connector a Remove male BNC connector and lock washer from housing To remove BNC connector use a 3 8 inch open end wrench and hold the hous ing either in a vise or with phers Before using the vise or pliers protect the housing of the 11523A with material such as heavy paper or tape or use plastic jaws on the vise or pliers b Unsolder resistor c Solder resistor to new BNC connector Model 423A 8470A d Let resistor cool and then check resistance from male BNC pin through resistor resistance meas sured should be 10 that indicated by the color coding e Replace lockwasher and male BNC con nector 51 Replacing Female BNC Connector a Remove female BNC connector To re move or install BNC connector use a BNC wrench or use a male BNC connector as a wrench to pre vent damage to the connector b Unsolder contact spring c Prepare replacement female BNC connector 1 Cut center conductor lead to approx imately 0 79 mm 1 32 in 2 With flat file smooth
10. average for lt 1 minute Sensitivity at 25 C High Level lt 0 35 mW produces 100 mV output Low Level gt 0 4 mVde uW CW Output decreases with increasing temperture Typically 0 015 dB C from 0 C to 55 C SWR 423A and 8470A 10 MHz to 4 5 GHz 1 20 4 5 GHz to 7 0 GHz 1 35 7 0 GHz to 12 4 GHz 1 50 8470A 12 4 GHz to 18 0 GHz 1 70 input Impedance 502 nominal Output Impedance lt 15 kQ shunted by 10 pF Output Polarity Negative refer to options for posi tive polarity units Detector Element Supplied refer to Table 2 for re placement assemblies Bias Not required Noise lt 200 uV p p with CW applied to produce 100 mVdc output las read on a meter calibrated for square law detectors such as HP 415E SWR Meter Options 423A Option 001 Matched pair Frequency response characteristics exclusive of basic sensitivity track within 0 2 dB over any octave from 10 MHz to 8 GHz 20 3 dB from 8 to 12 4 GHz Option 002 Furnished with matched load resis tor 11523A for optimum square law character istics at 24 C 75 F L 0 5 dB variation from square law over a range of at least 30 dB up to 50 mV peak output working into an external load gt 75 kQ Sensitivity typically gt 0 1 mV uW when load resistor is used Overall length 144 mm 4 5 in Option 003 Positive polarity output 84704 Option 001 Matched pair Frequency response characteristics exclusive of basic sensiti
11. ay need replacing This contact is a small four pronged collet which snaps into a recess in the center conductor This contact is normally held in by the spring action of the four prongs With a magnifying glass examine this contact to determine if it needs re placement DO NOT REMOVE THIS CONTACT FOR INSPECTION it may be damaged by removal The contact should be free of burrs or wear and the prongs should be equally spaced If the contact is removed do NOT re use it it may be damaged by removal This contact is Amphenol part number 131 129 and HP 1250 0907 If this contact needs replacement and a new contact is available proceed as follows 1 Place the instrument so the connector faces down if possible 2 Tap the connector lightly and the contact should now protrude slightly Insert the centering pin of the Hewlett Packard collet remover Part Number 5060 0236 with the jaws open 3 Allow the jaws on the tool used to close and pull straight back from the connector without twisting The contact should come with the tool If not repeat the process Do NOT re use the contact SES kl Tr Y f SARA LU N INNER CONDUCTOR CONTACT Ue Il PE im QUTER CONDUCTOR 4 Snapinanew contact by pushing a new contact in place Test the action of the new contact by pushing in on it It should spring out again when released Amphenol Part Number 131 129 HP Part Number 1250 0907 Amphenol RF Division Da
12. cable charged to 14 volts stores 0 1 erg the maximum pulse rating of the detector element Connect cables to test equipment and discharge the cen ter conductor before connecting to the detector DO NOT NEEDLESSLY HANDLE DE TECTOR ELEMENT USED IN CR VS TAL DETECTOR Static electricity which builds up on a person especial ly on a cold dry day must never be allowed to discharge through the crys tal detector Avoid exposed leads to or from the crystal detector since these are often touched accidentally 22 Operating Information 23 The crystal detector can be used as a demodu lator to obtain a pulse envelope which can then be observed on an oscilloscope It can also be used as a general purpose detector 24 When using the crystal detector with an oscil loscope and the waveshapes to be observed have rise times of less than 5 us the coaxial cable con necting oscilloscope and detector should be as short as possible and shunted with a resistor Ideal ly this resistor should be 5082 to terminate the coaxial cable properly However with 500 resis tance the output video pulse may be too small to drive some oscilloscopes Therefore the cable should be shunted with the smailest value of resis tance that will obtain suitable deflection on the oscilloscope typically the value will lie between 508 and 2kQ The larger the resistance the more Model 423A 8470A degradation of rise time 25 The power applied to the detect
13. ct the contacting surfaces when the connector is not in use by leaving the coupling sleeve extended Use lintless material and or firm bristled brush such as a tooth brush for cleaning If a cleaning fluid is needed use isopropyl alcohol IMPORTANT Do not use aromatic or chlorinated hydrocarbons es ters ethers terpenes higher alcohols ketones or ether alcohols such as benzene toluene turpentine dioxane gasoline cellosolve acetate or carbon tetrachloride Keep exposure of the connector parts to both the cleaning fluid and its vapors as brief as possible Figure 6 APC 7 Connectors Model 423A 8470A i i Page 11 8 03 mm MIN 8470A 0 316 in 7 98 mm MIN 8 13 mm MAX 0 314 in 0 320 in 8 03 mm MAX AAA q 0 316 in 1 60 mm MIN 0 063 in 1 67 mm MAX 0 066 in 1 67 mm MAX 0 066 in A AW 423A l 8 08 mm MIN 0 318 in 8 18 mm MAX 0 322 in 10 207 in it 5 44 mm MIN 0 214 in ALL DIMENSIONS IN MILLIMETRES AND INCHES Figure 7 Type N Connector Dimensions 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 WARRANT
14. e of any operation with the detector element when it is out of either the housing or the detector ele ment shipping container a Before installing diode into mount touch exposed metal on mount with your hand to dis charge static electricity Then insert diode into mount b When handing dicde to another person touch hands first to ensure there is no difference in static electricity potential between you c Ohmmeters should not be used to meas ure forward and back resistance since it is easy to damage these diodes The difficulty arises because of the ohmmeter s open circuit voltages and short circuit currents 46 Replacing Detector Element 47 Parts mentioned in the following procedure are identified in Figure 4 a Remove connector cap from body To Model 423A 8470A remove connector cap use a pair of gas pliers with plastic teeth or protect bodv with heavv paper or tape b Remove old detector element capsule spacer and capacitive washer and discard them c Install the new capacitivie washer capsule spacer and detector element Install the washer first the spacer with its polyiron side against the washer Finally install the detector element by inserting the resistive end into the center contact inside the detector body CAUTION When inserting the detector element do not force the tip resistive end into the center conductor in the body as the fin gers of the center conductor might be dam
15. end of lead remove burr with tweezers or simi lar metal instrument d Slip contact spring over center conductor lead and solder CAUTION Use solder sparingly or it will creep back on spring Solder on spring destroys its usefulness and is difficult to remove e Let contact spring cool and then screw connector into mount 52 Replacement of APC 7 Connector Center Contact 53 The replacement procedure for the APC 7 connector center contact is covered in Figure 5 Page 7 CONTACT SPRING 1 i 0 79 mm 1 32 in pF Figure 2 Cutting Center Conductor Lead to Accommodate Contact Spring RESISTOR CONTACT SPRING LOCK WASHER LOCK WAS HER N ie Figure 3 Model 11523A Load Resistor Cutaway View The disassembly and assembly instructions for the APC 7 connecotr is covered in Figure 6 54 Type N Connector Dimensions 55 The critical dimensions for the type N connec tor are covered in Figure 7 Page 8 X DETECTOR ELEMENT RESISTIVE ELEMENT RUBBER GASKET TYPE N MALE NUT H TYPE N NUT RETAINING RING Model 423A 8470A FEMALE BNC CONNECTOR WASHER Pi da ASSEMBLY CONNECTOR CAP H THESE ITEMS REPLACED TOGETHER REFER TO TABLE 2 FOR DIODE REPLACEMENT ASSEMBLY STOCK NUMBERS l SPACER CAPACITIVE X WASHER Figure 4 HP Model 423A Crystal Detector Assembly REPLACING AMPHENOL APC 7 CENTER CONTACT Through wear or damage the contact in the center con ductor m
16. etector s SWR specifications use any system whose measurement accuracies for SWR residual SWR are known 37 ADJUSTMENTS 38 The detectors have no internal adjustments 39 REPLACEABLE PARTS 40 The succeeding paragraphs contain informa tion pertaining to replaceable parts see Table 2 and the ordering of replaceable parts for the Models 423A 8470A and 115234 41 To order a replacement part address order or inquiry to the nearest Hewlett Packard office see Page 6 list in back of manual Include the following in formation for each part model number Hewlett Packard part number and description 42 SERVICE 43 The succeeding paragraphs give instructions for repair of the Model 423A and 8470A Crystal Detectors and the Option 002 Load Resistor Model 11528A Additional maintenance informa tion can be obtained from the local Hewlett Packard office Part numbers for replaceable parts are given in Table 2 44 Detector Element Replacement 45 The detector element assembly includes only a detector element unless an Option 002 is ordered then a replacement load resistor for the 11523 A is included The resistor is to load the diode for square law operation CAUTION The special detector element see Figure 4 contained in the detector can be damaged in handling removal or installation if cer tain precautions are not taken Then hand ling precautions which follow should be read before performanc
17. nbury Conn Figure 5 APC 7 Connector Model 423A 8470A Table 2 Replaceable Parts Models 423A 8470A and 11523A is so 423A Assembly Connector Female BNC Connector Cap Connector Assembly Female BNC including contact assembly Body Assembly 423A Includes the following Type N Male Connector Outer Conductor Type N Male Nut Rubber Gasket Type N Nut Retaining Ring Type N Male Nut Type N Male Connector Bead Type N Male Connector Center Conductor Body Crystal Mount 423A Diode Replacement Assemblies Single Diode Negative Polarity Single Diode Positive Polarity Opt 003 Single Diode Negative Polarity with Matching Load Resistor Opt 002 Single Diode Positive Polarity with Matching Load Resistor Opt 002 and 003 Matched Pair Diodes Negative Polarity Opt 001 Matched Pair Diodes Positive Polarity Opt 001 003 Matched Pair Diodes with Load Resis tor Negative Polarity Opt 001 002 Matched Pair Diode with Load Resis tor Positive Polarity Opt 001 002 and 003 11523A Load Resistor Assembly Connector Male BNC Connector Female BNC Spring Contact Housing 8470A APC 7 Connector Assembly Inner Conductor Contact Mechanism assemblied contact and outer body Coupling Sleeve Inner Conductor Contact Outer Conductor Coupling Nut Support Bead 1250 0251 5020 0210 00423 600 00423 601 1250 0014 1250 0015 1250 0016 1250 0918 5020 0207 00423 201 00423 202 00423 802 00423 8
18. or can be either modulated or continuous wave CW If modulated at a 1000 Hz rate an SWR meter can be used as an indicator For CW detection a dc milliammeter or millivoltmeter can be used as the indicator 26 Operator s Checks 27 Peak Power Measurement The arrangement of equipment for peak power measurement is shown in Figure 1 The procedure involves calibration of an oscilloscope which in turn is used to calibrate a CW generator The output of the calibrated CW generator is measure with a power meter the peak power of a pulse is thereby measured The proce dure is as follows a Connect equipment as shown in Figure 1 step a Observe pulse on a dc coupied oscilloscope Using a marking pencil mark on the graticule the base to peak amplitude of the pulse envelope b Replace the pulse source with a CW gen erator While observing the oscilloscope trace ad just amplitude of CW generator output to make de tector s output equal to that of pulse generator as indicated by markings on graticule step a c Leave CW generator at setting obtained in step b Disconnect detector from CW generator sTEP A PULSE SOURCE OSCILLOSCOPE CRYSTAL DETECTOR VERTICAL STEP CONTINUOUS WAVE GENERATOR OSCILLOSCOPE CRYSTAL DETECTOR VERTICAL POWER METER STEP CONTINUOUS WAVE GENERATOR THERMISTOR MOUNT Figure 1 Peak Power Measurement Model 423A 8470A Connect output of CW genera
19. tor must be an APC 7 type connector The mating RF input connectors used with the 423A and 8470A Option 012 must be Type N female connec tors which comply with U S military standard MIL C 39012 The mating RF input connector used with the 8470A Option 013 must be Type N male connector which complies with MIL C 39012 16 Operating Environment 17 The operating environment of the crystal de tectors should be within the following limitations a Temperature 0 to 55 C b Altitude lt 4572 metres 15 000 feet c Humidity lt 95 relative 18 STORAGE AND SHIPMENT 19 Environment The instrument should be stored in a clean dry environment The following environ mental limitations apply to both storage and shipment a Temperature 20 C to 55 C b Altitude lt 7620 metres 25 000 feet c Humidity lt 95 relative Model 423A 8470A Fi FS Page 3 Table 1 Specifications Frequency Range 423A 10 MHz to 12 4 GHz 8470A 10 MHz to 18 GHz NOTE RF may leak through the output connector especially below 1 GHz It can be reduced if objectionable with a suitable low pass filter Frequency Response 423A 0 2 dB over any octave 10 MHz to 8 GHz 0 5 dB 10 MHz to 12 4 GHz 8470A 0 2 dB over any octave 10 MHz to 8GHz 10 5 dB 10 MHz to 12 4 GHz 1 0 dB 10 MHz to 18 GHz Maximum Operating Input Power 100 mW peak or average Maximum Short Term Input Power 100 mW typi cal peak or
20. tor to power meter Measure adjusted levels set in step b of CW gener ator output The peak power of the pulse envelope observed in step a is equal to the output power of the CW generator 28 Reflectometer Application For information about reflectometer svstems and measurements see HP Application Note Index copies of which are available upon request 29 Harmonic Frequency Comparison Measure ment Application The detector can be used as a mixer in harmonic frequency comparison measure ments see HP Application Note Index for further information 30 PERFORMANCE TESTS 31 The following paragraphs suggest methods to use for testing detector specifications For these tests refer to the manuals of the equipment involved for operating instructions 32 Frequency Response Test a Using signal sources covering 10 MHz to 18 GHz with a 10 dB isolating attenuator and a power meter connect power sensor to attenuator Adjust RF power level to 20 dBm input to power sensor b Without changing RF power level of sig nal source disconnect power sensor c Connect detector to attenuator Measure dc voltage output from detector and record meas urement d Change frequency of signal source and re peat steps a through c e Since the detector follows a square law response at this power level its output is propor tional to power Pap 10 log Vo Total variation of detector readings should meet specifications see Table
21. vity track within 10 2 dB over any octave from 10 MHz to 8 GHz 0 3 dB from 8 to 12 4 GHz 20 6 dB from 12 4 to 18 GHz Option 002 Furnished with matched load resis tor 11523A for optimum square law character isties at 24 C 75 F lt 0 5 dB variation from square law over a range of at least 30 dB up to 50 mV peak output working into an external load gt 75 kQ Sensitivity typically gt 0 1 mV uW when load resistor is used Overall length 144 mm 4 5 in Option 003 Positive polarity output Option 012 Furnished with stainless steel type N male connector Option 013 Furnished with stainless steel type N female connector General Weight Net 114 g 4 oz 423A and 8470A Dimensions 423A 63 mm long 20 mm diameter 2 46 in long 0 78 in diameter 8470A 64 mm long 19 mm diameter 2 50 in long 0 75 in diameter Page 4 20 Original Packaging Containers and materials identical to those used in factorv packaging are available through Hewlett Packard offices If the instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and serial number Also mark the container FRA GILE to assure careful handling In any corres pondence refer to the instrument by model num ber and serial number 21 OPERATION CAUTION Static discharge can damage the detector element A 100 pF capacitor 1 2 m 4 ft of coax
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