HP423B/HP8470B Manual
Contents
1. 2 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 back 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 COUPLING SLEEVE Close the gap between coupling nuts with the nut CONTACTING on the extended sleeve connector SURFACES To Disconnect 1 Loosen the coupling nut of the connector showing the wider gold band 2 Protect the contacting surfaces when the connector is not in use by leaving the coupling sleeve extended WIDER BAND 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 2 IMPORTANT Part the connectors carefully to pre to both the cleaning fluid and its vapors as brief as vent striking the inner conductor contact possible Figure 6 APC 7 Connectors pa Model 423B 8470B Page 11 REPLACING AMPHENOL APC 7 CENTER CONTACT Through wear or damage the cont2. OPERATING AND SERVICE MANUAL 8470B CRYSTAL DETECTOR ll HEWLETT hp PACKARD Printed FEBRUARY 1979 O Hewlett Packard Co 1975 1977 gv dH 008 dH Page 2 1 GENERAL INFORMATION 2 This manual contains operating instructions for the Hewlett Packard Model 423B and 8470B Crys tal Detectors Included in the manual is the inform ation required to install and test the crystal detectors 8 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 423B and 8470B Crystal Detectors are 5002 nominal devices de signed for measurement use in coaxial systems The instruments convert RF power levels applied to the 5072 input connector into proportional values of dc voltage The instruments measure relative power up to 200 mW and have a BNC female connector for the output jack which allows the detected out put to be connected to a SWR meter The output voltage polarity is negative unless Option 003 is selected The frequency range of the 423B is 10 MHz to 12 4 GHz The 8470B s frequency range extends from 10 MHz to 18 GHz 8 Options 9 The 423B and 84
3. Connector Male BNC 1250 0045 Coupling Sleeve Connector Female BNC 1250 0251 Inner Conductor Contact Spring Contact 5000 0234 Outer Conductor Housing 5020 3215 Support Bead Tools 2 8470B and 8470B 012 Assemblies Connector Female BNC Contact RF Connector Connector RF APC 7 APC 7 Contact Extractor APC 7 Spanner Wreneh Open end Wrench 1250 0212 1250 0816 1250 0909 I refer to Table 1 for description of options part of HP Model 11591A APC 7 Connector Tool Kit EE are mawan Page 9 1460 0072 2190 0016 5020 0210 5021 0127 5020 8598 5040 0306 08470 2000 08470 20002 1250 0016 1250 0916 1250 0917 1250 0918 08470 60012 08470 60013 08470 60014 08470 60015 08470 60016 08470 60017 08470 60018 08470 60019 1250 0816 1250 0819 1250 0820 1250 0907 1250 1183 5040 0306 5060 0236 5060 0237 8710 0877 Page 10 Model 423B 8470B EN i CONDUCTOR SUPPORT BEAD INNER CONDUCTOR CONTACT MECHANISM OUTER CONDUCTOR COUPLING NUT COUPLING SLEEVE USE CARE To Connect 1 Keep contacting surfaces smooth and clean Irreg ularities and foreign particles can degrade electrical 1 On one connector retract the coupling sleeve by performance turning the coupling nut counterclockwise until the sleeve and nut disengage
4. 5020 0210 Nut RF Connector Opt 012 Washer Cap 5021 0127 Spacer Axial 5020 8598 Contact Outer 00423 201 Replacement Diode Assemblies Body Crystal Mount 00423 202 Single Diode Negative Polarity Single Diode Positive Polarity Opt 003 Single Diode w Matching Load Resistor Negative Polarity Opt 002 Single Diode w Matching Load Resistor Positive Polarity Opt 002 003 Matched Pair Diodes Negative Polarity Opt 001 Matched Pair Diodes Positive Polarity Opt 001 003 Matched Pair Diodes w Load Resistor Negative Polarity Opt 002 Matched Pair Diodes w Load Resistor Positive Polarity Opt 002 003 8470B APC 7 Connector Assembly Inner Conductor Contact Mechanism assemblied contact and outer body Coupling Nut Replacement Diode 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 002 Matched Pair Diode with Load Resis tor Positive Polarity Opt 002 003 00423 60003 00423 60004 00423 60005 00423 60006 00423 60007 00423 60008 00423 60009 00423 60011 11523A Load Resistor Assembly
5. and 30 C the sensitivity slope is typically 0 04 dB C NOTE Multiple mismatch errors caused by atten uator SWR power meter SWR and detec tor SWR should be taken into account as well as accuracy of indicator used to meas ure detector s output 35 Match Test SWR 36 To verify the detector 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 423B 8470B and the Load Resistor 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 423B and 8470B Crystal Detectors and the Option 002 Load Resistor Additional maintenance information can be ob tained 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 resistor for the Load Resistor is included The resistor is t
6. record measurement 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 VQ Total variation of detector readings should meet specifications see Table 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 2 GHz a 10 dB 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 the dc voltage out put from detector The output should be gt 5 0 mV at 25 C Between 20 C
7. 70B Crystal Detectors are avail able with the following options see Table 1 for further descriptions Option 001 Matched pair of detectors Option 002 Furnished with matched load re sistor for optimum square law characteristics Option 003 Positive polarity output Option 012 Furnished with stainless steel type N male connectors 8470B only 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 ETE Model 423B 8470B pri and the instrument has been checked mechanically and electrically HEE Sole is 13 The procedures for checking electrical perform ance 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 without waiting for claim settlement 14 Mating Connectors 15 The mating RF input connectors used with the 423B and the 8470B Option 012 must be Type N female connectors which comply with U S military sta
8. ISTOR CONTACT SPRING LOCK WASHER LOCK WASHER MALE BNC FEMALE BNC SOLDER THESE POINTS HOUSING Figure 3 Load Resistor Cutaway View Page 8 CAP CONNECTOR SPRING COMPRESSION WASHER LOCK INTERNAL CONNECTOR FEMALE BNC RING RF CONNECTOR NUT RF CONNECTOR OPTION 012 CONTACT RF CONNECTOR SPACER AXIAL CAP CONNECTOR SPRING COMPRESSION lt a g r Ad ON K CONNECTOR FEMALE BNC WASHER LOCK INTERNAL Figure 5 HP Model 8470B and 8470B Option 012 Crystal Detector Assemblies Model 423B 8470B NUT GASKET RF CONNECTOR RF CONNECTOR RING RF CONNECTOR CONTACT OUTER CENTER CONDUCTOR CONNECTOR BODY CRYSTAL MOUNT WASHER CAP DETECTOR ELEMENT CONNECTOR RF APC 7 CONTACT RF CONNECTOR INSULATOR CONDUCTOR CENTER CRYSTAL MOUNT WASHER gt DETECTOR RF ADAPTER ELEMENT 6 kestion Seiten an h Model 423B 8470B Table 2 Replaceable Parts Models 423B 8470B and 11523A Spring Compression Washer Lock Internal Cap Connector 423B Assembly Conductor Center 1250 0014 Gasket RF Connector 1250 0015 Washer Cap Ring RF Connector 1250 0016 Spacer Axial Connector Female BNC 1250 0212 Insulator Nut RF Connector 1250 0918 ae ine mri ne ona mtn ora 2 Connector RF APC Opt 012 Bead Connector 5020 0207 Contact RF Connector Opt 012 Cap Connector
9. YSTAL DETECTOR STEP CONTINUOUS WAVE OSCILLOSCOPE GENERATOR CRYSTAL DETECTOR VERTICAL STEP POWER METER CONTINUOUS WAVE GENERATOR THERMISTOR MOUNT Figure 1 Peak Power Measurement ee ke ai 2 Model 423B 8470B Connect output of CW generator 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 systems 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 asa 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
10. act in the center con ductor may 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 sa E naon of the four prongs With a magnifying TE PP COUPLING glass examine this contact to determine if it needs re A aa Sy placement DO NOT REMOVE THIS CONTACT FOR Wh imm INSPECTION it may be damaged by removal The WI yj IG contact should be free of burrs or wear and the prongs re 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 MME ee CONDUCTOR 1250 0907 If this contact needs replacement and a U E CONTACT new contact is available proceed as follows SG SY SUPPORT BEAD mm bima 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 4 Snap in anew contact by pushing a new of the Hewlett Packard collet remover Part Number contact in place Test the action of the new contact by 5060 0236 with the jaws open pushing in on it It should spring out again when released 3 Allow the jaws on the tool used to close and pull straight back from the connector without twisting Amphenol Part Number 131 129 HP Part Number The contact should come with the tool If not repeat 1250 0907 the process Do NOT re use the contact A mph
11. ct the nearest regional office listed below UNITED STATES EUROPE CALIFORNIA FRANCE 333 Logue Ave Hewlett Packard France Mt View CA 94043 Quartier de Courtaboeuf or 6315 Arizona Place i Boite Pastale No 6 Los Angeles CA 90045 F 91401 Orsay Cedex GEORGIA GERMAN FEDERAL REPUBLIC P O Box 105005 Hewlett Packard GmbH Atlanta GA 30348 Vertriebszentrale Frankfurt ILLINOIS Bernerstrasse 117 j 5201 Tollview Dr Postfach 560 140 Rolling Meadows IL 60008 D 6000 Frankfurt 56 NEW JERSEY NETHERLANDS W 120 Century Rd Hewlett Packard Benelux N V Paramus NJ 07652 Van Heuven Goedhartlaan 121 P O Box 667 AUSTRALIA NL Amstelveen 1134 g SWITZERLAND Hewlett Packard Australia Pty Ltd Hewlett Packard Schweiz AG P O Box 36 p Zurcherstrasse 20 Doncaster East Victoria 3109 P O Box 307 CH 8952 Schlieren Zurich CANADA UNITED KINGDOM Hewlett Packard Canada Ltd Hewlett Packard Ltd 6877 Goreway Drive King Street Lane Mississauga Ontario GB Winnersh Wokingham Canada L4V 1M8 Bers RG11 5AR AFRICA ASIA CENTRAL AND SOUTH AMERICA Hewlett Packard Intercontinental 3200 Hillview Avenue Palo Alto CA 94304 HEWLETT Api PACKARD Manual Part Number 00423 90103 Microfiche Part Number 00423 90104 Printed in U S A
12. enol RF Division Danbury Conn Figure 7 APC 7 Connector CERTIFICATION The Hewlett Packard Company certifies that this instrument met its published specifica tions at the time of shipment from the factory Hewlett Packard Company further certi fies 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 cali bration facilities of other International Standards Organization members WARRANTY AND ASSISTANCE This Hewlett Packard product is warranted against defects in materials and workmanship for a period of one year from the date of shipment Hewlett Packard will at its option repair or replace products which prove to be defective during the warranty period pro vided they are returned to Hewlett Packard Repairs necessitated by misuse of the product are not covered by this warranty NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE HEWLETT PACKARD IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES Service contracts or customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office HEWLETT PACKARD SERVICE OFFICES To obtain servicing information contact the nearest Hewlett Packard Sales and Service Office in HP Catalog or conta
13. ndard MIL C 39012 The 8470B standard RF input connector must be an APC 7 type connector The mating output connector for the 423B and 8470B must be a BNC male 16 Operating Environment 17 The operating environment of the crystal de NA tectors should be within the following limitations a Temperature 20 C to 85 C 8470B and 0 to 55 C 423B b Altitude lt 4570 metres 15 000 feet c Humidity lt 95 relative d Shock 100G for 11 ms e Vibration 20G from 80 to 2000 Hz 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 54 C to 85 C b Humidity lt 95 relative c Altitude lt 7620 metres 25 000 feet d Shock 100G for 11 ms e Vibration 20G from 80 to 2000 Hz Model 423B 8470B Page 3 Table 1 Specifications Frequency Range 423B 10 MHz to 12 4 GHz 8470B 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 gt 423B 0 2 dB over any octave 10 MHz to 8 GHz 0 3 dB 10 MHz to 12 4 GHz 0 2 dB over any octave 10 MHz to 8 GHz 0 3 dB 10 MHz to 12 4 GHz 0 5 dB 10 MHz to 15 GHz 0 6 dB 10 MHz to 18 GHz Maximum Operating Input Power 200 mW peak or average Maximum Short Term Inpu
14. nto the center conductor in the body The fingers of the center conductor or the detector element might be damaged if the detector element is not centered c Remove old detector element axial spacer and RF washer and discard the detector element d Install the RF washer axial spacer and new detector element Figures 4 and 5 show the proper orientation for the internal components Insert the RF adapter washer first then carefully insert the large pin end of the detector element into the center contact inside the detector body Place the axial spacer over the small pin end of the detector element e Carefully place the connector cap over the body and assembled components and tighten firmly in place f Place the compression spring into the center conductor of the female BNC connector Carefully start the spring over the small pin of the detector element through the hole in the connector cap Keep the spring in the BNC center conductor and screw the female BNC connector firmly into place 48 Replacement of Load Resistor 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 pliers Before using the vise or pliers protect the housing of the Load Resis tor with material such as heavy paper or ta
15. o load the diode for square law operation CAUTION The special detector element see Figures 4 and 5 contained in the detector can be damaged in handling removal or instal lation if certain precautions are not taken The handling precautions which follow should be read before performance of any operation with the detector element when it is out of either the housing or the detector element 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 diode 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 Figures 4 and 5 a Remove female BNC connector and com pression spring from inside of the connector cap Model 423B 8470B b Remove connector cap from body To remove connector cap use a pair of pliers with plastic jaws or protect body with heavy paper or tape CAUTION Do not rotate detector element while in serting or removing or damage may result When inserting detector element do not force the large pin end i
16. pe or use plastic jaws on the vise or pliers b Unsolder resistor 4 Model 423B 8470B Page 7 c Solder resistor to new BNC connector d Let resistor cool and then check resistance from male BNC pin through resistor resistance meas CONTACT ured should be 10 that indicated by the color coding e Replace lockwasher and male BNC connector 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 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 con nector center contact is covered in Figure 7 The disassembly and assembly instructions for the APC 7 connector is covered in Figure 6 SPRING 0 79 mm 1 32 in Figure 2 Cutting Center Conductor Lead to Accommodate Contact Spring RES
17. r pair Frequency response characteristics exclusive of basic sensi tivity track within 0 2 dB from 10 MHz to 12 5 GHz 0 3 dB from 12 4 GHz to 18 GHz Option 002 Furnished with matched Load Resistor for optimum square law characteristics of 25 C within 0 5 dB from square law over a range of at least 30 dB up to 10 mV peak output working into an external load gt 8 kQ Sensitivity typically gt 0 1 mV uW when load resistor is used Option 003 Positive polarity output Option 012 Furnished with stainless steel type N male connector Environmental 423B Operating Temperature 0 C to 55 C Humidity lt 95 relative Vibration 20G from 80 to 2000 Hz Shock 100G for 11 ms Altitude 4570m 15 000 ft 8470B Operating Temperature 20 C to 85 C Humidity lt 95 relative Vibration 20G from 80 to 2000 Hz Shock 100G for 11 ms Altitude 4570m 15 000 ft General Weight Net 114 g 4 oz 423B and 8470B Dimensions 423B 63 mm long 20 mm diameter 2 47 in long 0 78 in diameter 8470B 64 mm long 19 mm diameter 2 50 in long 0 75 in diameter E Page 4 20 Original Packaging Containers and materials identical to those used in factory 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 ma
18. rk 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 CAUTIONS Static discharge can damage the detector element A 100 pF capacitor 1 2 m 4 ft of coax cable charged to 14 volts stores 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 CRYSTAL DETECTOR Static electricity which builds up on a person especially on a cold dry day must never be allowed to discharge through the crystal detector Avoid exposed leads to or from the crys tal 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 Ideally this resistor should be 50 to terminate the coaxial cable properly However with 500 resistance the output video pulse may be too small to drive some oscilloscopes Therefore the cable should be shunted with the smalle
19. st value of resistance that will obtain suitable deflection on the oscilloscope typically the value will lie between 509 and 2kQ The larger the resistance the more degradation of rise time Model 423B 8470B 25 The power applied to the detector can be either modulated or continuous wave CW If modulated I ata 1000 Hz rate an SWR meter can be used as an indicator For CW detection a de 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 measured 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 de coupled 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 VERTICAL CR
20. t Power 1 watt typical peak or average for lt 1 minute Sensitivity 3 High Level lt 0 3 mW produces 100 mV output Low Level gt 0 5 mVdc uW CW SWR 1 2 423B and 8470B 10 MHz to 4 GHz 1 15 4 GHz to 12 4 GHz 1 3 8470B 4 GHz to 15 GHz 1 3 15 GHz to 18 GHz 1 4 Input Impedance 502 nominal Output Impedance 1 to 2 kQ typically 1 3 kQ shunted by 20 to 60 pF typically 30 pF Output Polarity Negative refer to Options for posi tive polarity units Detector Element Supplied refer to Table 2 for replacement elements Bias Not required Noise lt 50 uV p p with CW applied to produce 100 mV output I Specifications given for 25 C unless otherwise noted 2Measurement made at 20 dBm 3Sensitivity decreases with increasing temperature typically 0 5 dB from 20 C to 25 C 0 5 dB from 25 C to 40 C 1 dB from 40 C to 55 C 1 25 dB from 55 C to 75 C 1 dB from 75 C to 85 C Options 423B Option 001 Matched detector pair Frequency response characteristics exclusive of basic sensi tivity track within 0 2 dB from 10 MHz to 12 4 GHz Option 002 Furnished with matched Load Resistor for optimum square law characteristics at 25 C within 0 5 dB from square law over a range of at least 30 dB up to 10 mV peak output working into an external load gt 0 1 mV uW when load resistor is used Option 003 Positive polarity output 8470B Option 001 Matched detecto
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