Operating and Service Manual
Contents
1. 43 Repair Strategysw e IERI RD E OE 43 Procedure ce cr pA AO CROSS ERE 43 A2 Power Sensor Board Assembly 44 Repait Strategy sureste kde este 44 Procedure pM Pc 44 B Contents FET Balance Adjustment 45 Equipment Required sisson cet Slice Cased Pan Cae bees CRE EA 45 Lest DescriptiOn de Bia need 65 ben eee ss EVE PU SUE 45 FET Balance Procedure 46 Disassembly Reassembly Procedures 49 Disassembly Procedure rese Tet PDA Let Res Yu 49 Reassembly Procedures 51 EPM Series Power Meter E4418B Modification The Material and Tools 54 Iimp ct on Warranty f D SE eens 54 Modification Procedure 55 Bulkhead Assemblies Bulkhead Parts Lists tM ER E ptt 62 Bulkhead Exploded Graphics esee 69 Contents Introduction This Operating and Service Manual contains information about initial inspection performance tests adjustments operation troubleshooting and repair of the Agilent 8480 Series Coaxial Power Sensors Chapter 1 1 Figure 1 1 Introduction General Information Instruments Covered by Manual A serial number label is attached to the power sensor The serial number has two parts the prefix two letters and the first four numbers2. 049 EldW ANO 049 NOMIA lOd 20 5 Z Eldn Appendix B 76
3. 1 15 0 070 12 4 to 18 GHz 1 20 0 091 18 to 26 5 GHz lt 1 25 0 111 26 5 to 40 GHz 1 30 0 130 40 to 50 GHz 1 50 0 20 Chapter 2 27 General Information Table 2 2 Power Sensor SWR and Reflection Coefficient Frequency Maximum System SWR Performance Actual SWR Uncertainty Limit Rho Measurement Reflection System Rho Coefficient Uncertainty 8481B 10 MHz to 2 GHz 1 10 0 048 2 to 12 4 GHz 1 18 0 083 12 4 to 18 GHz 1 28 0 123 8482B 100 kHz to 2 GHz 1 10 0 048 2 to 4 2 GHz 1 18 0 083 8481H 10 MHz to 8 GHz 1 20 0 091 8 to 12 4 GHz lt 1 25 0 112 12 4 to 18 GHz 1 30 0 130 8482H 100 kHz to 4 2 GHz 1 20 0 091 8481D 10 to 30 MHz 1 40 0 167 0 03 to 4 GHz 1 15 0 070 4 to 10 GHz 1 20 0 091 10 to 15 GHz 1 30 0 130 15 to 18 GHz 1 35 0 112 28 Chapter 2 General Information Table 2 2 Power Sensor SWR and Reflection Coefficient Frequency Maximum System SWR Performance Actual SWR Uncertainty Limit Rho Measurement Reflection System Rho Coefficient Uncertainty 8485D 50 to 100 MHz 1 19 0 085 0 1 to 4 GHz 1 15 0 070 4 to 12 GHz 1 19 0 085 12 to 18 GHz 1 25 0 112 18 to 26 5 GHz 1 29 0 127 8487D 50 to 100 MHz 1 19 0 085 0 1 to 2 GHz 1 15 0 06
4. dte a E 3 Ditiensions 5 8480 series B models information 5 Safety Considerations ere RR RE EE hoes ees 6 8480 series Options Hote a pede UE SR UOS E OE 6 8485A and 8485 option 033 6 Accessories Supplied es tert uote e Boe meg Cea cR EHE rd e 6 8483 75 Ohi sensor ie or gU OUR UBI 7 D model 8480 series sensors 8481D 8485D 8485D 033 and 8487D 7 26 5 GHz and 33 GHz Frequency operation 8485A 8485A 033 8485D and 8485D 033 ete ee e RU cte mede sie Oei aera 8 50 GHz Frequency operation 8487A and 8487 9 Recommended Calibration 10 Warnanya ee Renee rece 10 8480 Series Power Sensor Specifications 11 Supplemental 18 Installation Sea bdo bl EE 19 Initial Inspection 19 Original Packaging 19 Interconnections i e Sees IRURE ee ets ME ee ae Dae RET eres 19 Storage and Shipment 19 Environment 2 A E uS mV Ce Se ERAS 19 Operation so Cu SIC CM eq ed ete 20 Environment 20 Operating Precautions cce ee
5. 22 Chapter 1 General Information This chapter contains information about recommended equipment performance tests and replacement parts of the Agilent Coaxial Power Sensors Chapter 2 23 General Information Recommended Test Equipment Table 2 1 lists the test equipment recommended to check adjust and troubleshoot the Power Sensor If substitute equipment is used it must meet or exceed the critical specifications to be used in place of the recommended instruments for servicing the Power Sensor NOTE Check the Power Sensor s warranty Opening it voids the warranty Table 2 1 Recommended Test Equipment done Instrument Type Critical Specifications Suggested Model Use Power meter No Substitute E4418B Modified A See Appendix A Digital Voltmeter Range 100 mVdc to 100 Vdc 34401A T Input Impedance 100 mohm Resolution 4 digit e Accuracy 0 05 1 digit Oscilloscope Bandwidth dc to 50 MHz 54622A Sensitivity Vertical 50 mV div Horizontal 500 us div BNC m to BNC m 10503C A 2 required Ohmmeter Range 1 100 000 ohm 34401A T Accuracy 5 a A Adjustment T Troubleshooting 24 Chapter 2 CAUTION CAUTION General Information Connector Care Keeping in mind its flammable nature a solution of pure isopropyl or ethyl alcohol can be used to clean connectors The RF connector bead deteriorates when contacted by
6. 2 GHz to 12 4 GHz 1 15 12 4 GHz to 18 GHz 1 20 18 GHz to 26 5 GHz 1 25 26 5 GHz to 40 GHz 1 30 40 GHz to 50 GHz 1 50 a Negligible deviation except for those power ranges noted Chapter 1 15 Introduction Table 1 8 High sensitivity sensors 100 pW to 10 uW 70 dBm to 20 dBm Model Frequency Maximum SWR Power Maximum Connector Weight Range Lin earity Power Type 8481D 10 MHz to 18 10 MHz to 30 MHz 30 dBm to 100 mW avg Type N m Net 0 16 kg GHz 1 40 20 dBm 1 100 mW pk 0 37 Ib 30 MHz to 4 GHz Shipping 1 15 0 5 kg 1 0 Ib 4 GHz to 10 GHz 1 20 10 GHz to 15 GHz 1 30 15 GHz to 18 GHz 1 35 8485D 50 MHz to 50 MHz to 30 dBm to 100 mW avg APC 3 5mm Net 0 2 kg 26 5 GHz 100 MHz 1 19 20 dBm 2 100 mW pk m 0 38 Ib 100 MHz to 4 GHz Shipping 1 15 0 5 kg 1 0 Ib 4 GHz to 12 GHz 1 19 12 GHz to 18 GHz 1 25 18 GHz to 26 5 GHz 1 29 Option 50 MHz to 26 5 GHz to 30 dBm to 100 mW avg APC 3 5mm Net 0 2 kg 8485D 33 GHz 33 GHz 1 35 20 dBm 2 100 mW pk m 0 38 Ib 033 Shipping 0 5 kg 1 0 Ib 16 Chapter 1 Table 1 8 High sensitivity sensors 100 pW to 10 uW 70 dBm to 20 dBm Introduction Model Frequency Range Maximum SWR Power Linearity Maximum Power Connector Type Weight 8487D gt 50 MHz to 50 GHz 50 MHz to 100 MHz 1 19 100 MHz to 2 GHz 1 15
7. and the suffix the last four numbers Refer to the Example Serial Number shown in Figure 1 1 Example Serial Number US 54250887 PREFIX SUFFIX V Y SERIAL NUMBER The two letters identify the country in which the unit was manufactured US represents the USA and MY represents Malaysia The four numbers of the prefix are a code identifying the date of a major design change incorporated in your power sensor The four digit suffix is a sequential number and coupled with the prefix provides a unique identification for each unit produced When seeking information about your power sensor refer to the complete serial number and include the full prefix number and the suffix number For further information concerning a serial number contact your nearest Agilent Technologies Sales and Service office 2 Chapter 1 NOTE Introduction Description The 8480 series power sensors are used for measuring the average power supplied by an RF or microwave source or device under test DUT In use the Power Sensor is connected to the RF or microwave source and to a compatible power meter Suitable and compatible power meters are the EPM series power meters E4418B and E4419B the EPM P series power meters E4416A and E4417A and the E1416A VXI power meter Discontinued and obsolete power meters that are compatible with the 8480 series sensors include the E4418A E4419A 435B 436A 437B 438A and 70100A MMS power meter T
8. account in order to determine the pass fail condition The Maximum SWR values also expressed in terms of the Reflection Coefficient Rho for each model of Power Sensor are listed in Table 2 2 NOTE For overlapping frequency points refer to the lower SWR specification Table 2 2 Power Sensor SWR and Reflection Coefficient Frequency Maximum System SWR Performance Actual SWR Uncertainty Limit Rho Measurement Reflection System Rho Coefficient Uncertainty 8481A 10 to 30 MHz 1 40 0 166 30 to 50 MHz 1 18 0 083 50 MHz to 2 GHz 1 10 0 048 2 to 12 4 GHz 1 18 0 083 12 4 to 18 GHz 1 28 0 123 8482A 100 kHz to 300 kHz 300 kHz to 1 MHz lt 1 60 0 231 lt 1 20 0 091 26 Chapter 2 General Information Table 2 2 Power Sensor SWR and Reflection Coefficient Frequency Maximum System SWR Performance Actual SWR Uncertainty Limit Rho Measurement Reflection System Rho Coefficient Uncertainty 1 MHz to 2 GHz lt 1 10 0 048 2 to 4 2 GHz 1 30 0 130 8483A 100 kHz to 600 kHz 1 80 0 286 600 kHz to 2 GHz 1 18 0 083 8485A 50 to 100 MHz 1 15 0 070 0 1 to 2 GHz 1 10 0 048 2 to 12 4 GHz lt 1 15 0 070 12 4 to 18 GHz lt 1 20 0 091 18 to 26 5 GHz 1 25 0 111 26 5 to 33 GHz 1 40 0 166 8487A 50 to 100 MHz 1 15 0 070 0 1 to 2 GHz 1 10 0 048 2 to 12 4 GHz
9. any chlorinated or aromatic hydrocarbon such as acetone trichlorethane carbon tetrachloride and benzene Do not attempt to clean connectors with anything metallic such as pins or paper clips Clean the connector face by first using a blast of compressed air If the compressed air fails to remove contaminants use a cotton swab dipped in isopropyl or ethyl alcohol If the swab is too big use a round wooden toothpick wrapped in a lint free cloth dipped in isopropyl or ethyl alcohol Torque For operation to 18 GHz the newer 8480 series power sensors have a Type N hex nut for tightening to the device under test or the power meter s 1 mW Power Reference Older 8480 series power sensors have a knurled portion on the connector Turn the connector nut or knurled portion only to tighten the torque should not exceed 135 N cm 12 in lb to avoid damage to the connector For APC3 5 mm and 2 4mm connectors the torque should not exceed 90 N cm 8 in Ib to avoid damage to the connector Damage can occur if torque 15 applied to the power sensor body Chapter 2 25 General Information Performance Test Standing Wave Ratio SWR and Reflection Coefficient Rho Performance Test This section does not provide a preset test procedure since there are several test methods and different equipment available to make these measurements Therefore when measuring this specification the actual accuracy of the test equipment must be taken into
10. bulkhead The Auto Zero Feedback circuit is coupled to the power sensor from the power meter The dc voltage used to set the zero level is applied to the input of FET A2UI by using A2R1 and as a voltage divider When the Power Sensor is used with a Power Meter the resistance to ground from J1 K Mount Resistor allows the Power Meter to determine the sensor s dynamic range Chapter 3 37 318 2 MOSN3S 83 04 VIA 23DW 33M0d OL iagram D Service Schematic Figure 3 1 Ados YOLIINNOY 5319193234 3H1 80230 ATINJNYWI3d AVW SIHL If 30 312N143234 NI d JHL OINI 50084 1531 E313WYI0 398Y 1 20803 LON Od NOLIDV2 759 XIONJddY JHL NI NOLL WIA JNILVODIOVE OL 83339 318 32 1434 AT31Vd3438 ALON 347 8 395 17 ZV JHL 40 SIN3N00M02 lt 73098 910 1 NI 32 9113 492 NI 39NVLSIS3H Q31V2ICNI SIANHH10 55318171 SILON NAOMS 31314003 JO SNOILYNOK3G Si iY JO M 4 201 0 NOLLYHOIS 1709 FUY 3099N355Y gt LIN SHOLLYNOIS3O 35343430 anorg Tenois 32 gt QAV09 w Nn09 gt sissvio 3 MOIS ISI INOW l Y JN 1 2H 02 119170 2 OW qnawvs gunawy 11411 mm Nem S 7
11. die Namen HP oder Hewlett Packard Bitte beachten Sie dass ehemalige Betriebsbereiche von Hewlett Packard wie HP Halbleiterprodukte HP chemische Analysen oder HP Test und Messwesen nun zu der Firma Agilent Technology geh ren Um Verwirrung zu vermeiden wurde lediglich bei Produktname und Nummer der vo laufende Firmenname ge ndert Produkte mit dem Namen Nummer HP XXXX lauten nun mehr Agilent XXXX Z B das Modell HP 8648 hei t nun Agilent 8648 Questo manuale potrebbe contenere riferimenti ad HP o Hewlett Packard Si noti che le attivit precedentemente gestite da Hewlett Packard nel campo di Test amp Misura Semiconduttori ed Analisi Chimica sono ora diventate parte di Agilent Technologies AI fine di ridurre il rischio di confusione l unica modifica effettuata sui numeri di prodotto e sui nomi ha riguardato il prefisso con il nome dell azienda dove precedentemente compariva HP compare ora Agilent Ad esempio il modello HP8648 ora indicato come Agilent 8648 Este manual puede hacer referencias a HP o Hewlett Packard Las organizaciones de Prueba y Medici n Test and Measurement Semiconductores Semiconductor Products y An lisis Qu mico Chemical Analysis que pertenec an a Hewlett Packard ahora forman parte de Agilent Technologies Para reducir una potencial confusi n el nico cambio en el n mero de producto y nombre es el prefijo de la compa a Si el producto sol a ser HP XXXX ahora pasa a ser A
12. input power The dc voltage is routed from the thermocouples to the input amplifier via gold wires reducing unwanted thermocouple effects The gold wires located in the black plastic block pass through ferrite beads A2E1 and A2E2 The ferrite beads increase the self inductance of the gold wires creating an RF choke The result is to minimize RF feedthrough to the A2 Power Sensor Board Assembly The dc output from the bulkhead assembly is applied to the two field effect transistors FETs in A2UI These transistors function as a sampling gate or chopper The sampling rate 1s controlled by a 220 Hz square wave supplied by the power meter The amplitude of the sampling gate output at pin 3 of A2U1 is a 220 Hz square wave proportional to the power input The sampled 220 Hz ac output is applied to the input amplifier A2Q1 which is the input stage for an operational amplifier The Auto Zero Feedback circuit is coupled to the power sensor from the power meter The dc voltage used to set the zero level is applied to the input of FET A2UI by using A2R1 and as a voltage divider When the Power Sensor is used with a Power Meter the resistance to ground from Mount Resistor allows the Power Meter to determine the sensor s dynamic range 36 Chapter 3 Service Diode Sensors The A1 Bulkhead Assembly presents a 50 Ohm load to the RF source A diode assembly in the bulkhead rectifies the applied RF to produce a dc voltage that var
13. merchantability and fitness for a particular purpose Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 5301 Stevens Creek Blvd Santa Clara CA 95052 USA Hersteller bescheinigung Warranty A copy of the specific warranty terms applicable to your Agilent Technologies product can be obtained from your local Sales and Service Office Manufacturer s Declaration This statement is provided to comply with the requirements of the German Sound Emission Directive from 18 January 1991 This product has a sound pressure emission at the operator position lt 70 dB A Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenl rminformationsverordnung vom 18 Januar 1991 Sound Pressure Lp 70 dB A At Operator Position Normal Operation According to ISO 7779 1988 EN 27779 1991 Type Test Schalldruckpegel Lp 70 dB A Am Arbeitsplatz Normaler Betrieb Nach ISO 7779 1988 EN 27779 1991 Typpr fung Contents 1 Introduction General Information 2 Instruments Covered by Manual 2 Description to
14. to those used in factory packaging are available through Agilent Technologies offices If the instrument is being returned to Agilent Technologies for servicing attach a tag indicating the type of service required return address model number and serial number Also mark the container FRAGILE to assure careful handling In any correspondence refer to the instrument by model number and serial number Interconnections Refer to the power meter s User s Guide for interconnecting instructions Storage and Shipment Environment The instrument should be stored in a clean dry environment The following limitations apply to both storage and shipment Temperature 40 to 75 C Relative humidity lt 95 Altitude lt 7 600 metres 25 000 ft Chapter 1 19 WARNING Introduction Operation Environment The operating environment for the Power Sensor should be as follows Temperature 0 to 55 C Relative humidity lt 95 Altitude lt 4 572 metres 15 000 ft Operating Precautions Before the Power Sensor is connected the following precautions must be observed BEFORE CONNECTING THE POWER SENSOR TO ANOTHER INSTRUMENT ensure that the instrument and power meter are connected to the protective earth ground Power Meter Calibrations Power Meter to Power Sensor calibration procedures differ with the power meter Follow the calibration procedure located in your power meter s user s guide Temperature Sensitivit
15. torque to the body of the Power Sensor Either of these common causes damages the bulkhead cartridge unit which holds the thermocouples diodes If this happens the fault causes a short or an open between the two gold wires Al Bulkhead Thermocouple Sensors Disconnect the gold wires from the A2 assembly before measuring the resistance Be extremely careful when measuring across the gold wires They are delicate and can be damaged easily Disconnect all cables from the Power Sensor Remove the clamp holding the two gold wires Resistance measured between the two gold wires from the Al Bulkhead Assembly is listed in Figure 3 1 40 Chapter 3 Table 3 1 CAUTION Step 1 Step 2 Step 3 Step 4 NOTE Step 5 Service Bulkhead Assembly Resistance Model Measured Resistance 8481A 8481B 8481H 8485A 8487A 200 Ohms 10 Ohms 8482A 8482B 8482H 245 Ohms 12 5 Ohms 8483A 375 Ohms 17 5 Ohms If the resistance value is incorrect failure is usually indicated by an open circuit then the A1 Bulkhead Assembly is defective If the resistance is correct then continue to test the A2 Power Sensor Board Assembly A1 Bulkhead Diode Sensors Disconnect the gold wires from the A2 assembly before measuring the voltage Be extremely careful when measuring across the gold wires They are delicate and can be damaged easily Disconnect all cables from the Power Sensor Remove the clamp holding the
16. two gold wires Connect the Precision 30dB Attenuator to the 1mW Power Reference connector on the power meter Connect the Power Sensor to the Precision 30dB Attenuator Models 8485A and 8487A require 3 5mm and 2 4mm adapters respectively Turn on the 1mW Power Reference and measure the voltage across the two gold wires The voltage should be between 0 9mV and 1 5mV If the voltage is incorrect then the A1 Bulkhead Assembly is defective If the voltage 1s correct then continue to test the A2 Power Sensor Board Assembly A2 Power Sensor Board Assembly It is extremely rare for the A2 Assembly to fail Eliminate the power meter the sensor cable and the A1 Bulkhead Assembly before suspecting the A2 Assembly Chapter 3 41 Service In most cases the operational amplifier made up of A2Q1 and the first amplifier of the power meter is operating correctly if the dc voltage on the metal cover of A2Q1 collector is 70 30 mV dc 42 Chapter 3 NOTE Step 1 Step 2 Step 3 Step 4 Service Repair Power Sensor repair consists of replacing either the A1 Bulkhead Assembly or the A2 Power Sensor Board Assembly A1 Bulkhead Assembly Repair Strategy The recommended repair strategy for the A1 Bulkhead Assembly is to completely replace it The replacement Bulkhead is calibrated at the factory and 1s supplied with a calibration report and a new calibration sticker for the Power Sensor Procedure Order your
17. used for other purposes 26 5 GHz and 33 GHz Frequency operation 8485A 8485A 033 8485D and 8485D 033 8480 series sensors that operate up to 26 5 GHz and 33 GHz are fitted with APC 3 5mm m connectors as standard To convert the APC 3 5mm m connector for calibration an adapter APC 3 5 f to Type N m is included with the power sensors Figure 1 4 shows the parts included with your power sensor NOTE The APC 3 5mm to Type N adapter is intended for use only at the 1 mW 50 MHz power reference of the power meter Its function as a calibration reference may be compromised if used for other purposes 8 Chapter 1 Figure 1 4 NOTE Introduction 8485A 8485A 033 8485D 8485D 033 Sensor Accessories 50 GHz Frequency operation 8487A and 8487D 8480 series sensors that operate up to 50 GHz are fitted with 2 4mm m connectors as standard To convert the 2 4mm m connector for calibration adapter 2 4mm f to Type N m is included with the power sensors shown in Figure 1 5 The 2 4mm to Type N adapter is intended for use only at the 1 mW 50 MHz power reference of the power meter Its function as a calibration reference may be compromised if used for other purposes Chapter 1 9 Introduction Figure 1 5 8487A Power Sensor with Adapter Recommended Calibration Interval Agilent Technologies recommends a one year calibration cycle for the 8480 series power sensors Warranty The 8480 series power
18. 000000711 S Bun Chop Output 2131 2 U23 HIGH GAIN J High Gain Output Low Gain Output Appendix A 59 EPM Series Power Meter E4418B Modification Step 10 Figure A 10 shows a different view of the modified Measurement PCB Figure A 10 Low Gain Output High Gain Output 2 Chop Output a gt ar ZIIT 0 Step 11 Label each of the connectors using the permanent marker and adhesive labels as shown in Figure A 11 Refit the cover handle and the rear bumper to the power meter Tighten both screws with the T 15 torque screwdriver Figure A 11 60 Appendix A Bulkhead Assemblies This Appendix contains the material lists and exploded graphics of the Bulkhead Assemblies 61 Bulkhead Assemblies Bulkhead Parts Lists Table B 1 Bulkhead Parts for the 8481A 8481B 8482B and 8482B Models Reference Part Description Sensor Model Designator 8481A 8481A 8482A 8481B Opt 001 8482B MP1 Connector Nut 5021 7255 5021 7255 MP2 Connector Component 1250 0016 1250 0016 MP3 Connector Body 1250 2132 1250 1466 1250 2132 MP4 Contact Assembly 1250 0917 1250 0816 1250 0917 MP5 Insulator 5040 0306 5040 0306 5040 0306 MP6 Center Conductor Cartridge 5020 3296 5020 3296 5020 3296 Adapter MP7 Compression Spring 1460 0977 1460 0977 1460 0977 MP8 Sliding Contact 5020 3297 5020 3297 5020 3297 MP9 Bulkhead 08481
19. 1 2 Input Introduction 8480 Series Power Sensor Simplified Block Diagram Cable Balanced Chopper I Power Sensing AC Signal Element 1 Thermocouple Thermistor or Diode Feedback 1 I 1 E 1 Autozero I Chop Signal Chop Signal Figure 1 2 shows a basic power sensor block diagram for both thermocouple and diode power sensing elements From the RF or microwave signal input both thermocouple and diode detector mounts generate very low voltages on the order of nV or nV The dc voltage is proportional to the power from the or microwave source As the dc voltage is a very low level it requires amplification before it can be transferred to the power meter on the standard cables The amplification is provided by an input amplifier assembly that consists of a balanced chopper sampling gate and an AC coupled low noise amplifier The dc voltage is routed on gold wires to the chopper circuit which converts the low level dc voltage to an ac voltage To do this the chopper 1s uses two field effect transistors FET s controlled by a 220 Hz square wave generated by in the power meter the Chop Signal The result is an ac output signal proportional to the dc input The ac signal is then amplified to a relatively high level ac signal that can be routed to the power meter by standard cables The autozero signal removes residual error voltages when there is no in
20. 14 109 04 13H m AfidNI 22 6009 6200 YCBYSI GDO09 29080 YER gt p0009 L880 2 18961 A18WISSY GV3HNTNG 1 1 gt 1 68y 2 ja e YU I ge i os 4 180041008 AT8WISSY ill 1dWV INANI ZY xi VERTS 28 81 VTSVS SHOSNIS HIMOd Chapter 3 38 NOTE CAUTION CAUTION Service Troubleshooting Troubleshooting information 1s intended to first isolate the Power Sensor or the Power Meter as the defective component When the Power Sensor is isolated troubleshooting information is intended to identify the A1 Bulkhead Assembly or the A2 Power Sensor Board Assembly as the defective component Before you open the Power Sensor to continue with the troubleshooting procedures try the substitution method of elimination Use another power meter known to be in good operating condition with the suspected power sensor and cable If the same problem occurs with the known good power meter substitute a known good power sensor cable Troubleshooting should be performed with the Power Sensor opened and the printed circuit board exposed Refer to the Disassembly Reassembly Procedures on page 49 When a failed assembly has been ide
21. 2 GHz to 12 4 GHz 1 20 12 4 GHz to 18 GHz 1 29 18 GHz to 34 GHz 1 37 34 GHz to 40 GHz 1 61 40 GHz to 50 GHz 1 89 30 dBm to 20 dBm 2 100 mW avg 100 mW pk 10 W us pulse 2 4 mm m Net 0 2 kg 0 38 Ib Shipping 0 5 kg 1 0 Ib a Negligible deviation except for those power ranges noted b Includes 11708A 30 dB attenuator for calibrating against 0 dBm 50 MHz power reference The 11708A is factory set to 30 dB 4 Chapter 1 0 05 dB at 50 MHz traceable to NIST SWR lt 1 05 at 50 MHz 17 Introduction Supplemental Characteristics Supplemental characteristics are intended to provide additional information useful in applying the power sensor by giving typical expected but not warranted performance parameters Figure 1 6 Typical CAL FACTOR and SWR vs Frequency SWR Cal Factor Frequency GHz Chapter 1 Introduction Installation Initial Inspection Inspect the shipping container If the container or packing material is damaged it should be kept until the contents of the shipment have been checked mechanically and electrically If there is mechanical damage or if the instrument does not pass the performance tests notify the nearest Agilent Technologies office Keep the damaged shipping materials if any for inspection by the carrier and an Agilent Technologies representative Original Packaging Containers and materials identical
22. 20015 08481 20015 08481 20015 MP10 Flat Washer 2190 0831 or 2190 0831 or 3050 0622 3050 0622 MP11 Cap Nut 08481 20016 08481 20016 08481 20016 MP12 Polyiron 08481 40006 08481 40006 MP13 Protective Cap 1401 0099 1401 0099 1401 0099 MP14 Outer Conductor Spacer 5021 0830 or 5021 0830 or 5021 0830 or 08742 0006 08742 0006 08742 0006 15 Inner Conductor Spacer 5020 8540 or 5020 8540 or 5020 8540 or 08742 0005 08742 0005 08742 0005 Al Cartridge 08481 60042 08481 60042 08482 60019 62 Appendix B Bulkhead Assemblies Table B 2 Bulkhead Parts for the 8481D Model Reference Part Description Sensor Model Designator 8481D MPI Connector Nut 5021 7255 MP2 Connector Component 1250 0016 MP3 Connector Body 1250 2132 MP4 Contact Assembly 1250 0917 5 Insulator 5040 0306 MP6 Center Conductor Cartridge Adapter 5020 3296 MP7 Compression Spring 1460 0977 MP8 Sliding Contact 5020 3297 MP9 Adapter Connector 08481 20034 MP10 Center Conductor Contact 08481 20032 MP11 Insulator 5040 0306 MP12 Stepped Center Conductor 08481 20033 MP13 Rear Spacer 08481 20029 MP14 Bellows 0955 0238 15 Feed Thru Insulator 08486 40001 MP16 Rear Housing 08481 20028 MP17 Cap Nut 08486 20007 18 Compensation Washer 08481 20031 MP19 Outer Conductor Spacer 5021 0830 MP20 Inner Conductor Spacer 5020 8540 MP21 Inner Conductor Spacer 08742 0005 MP22 Outer Conductor Spacer 08742 0006 Al Cartri
23. 3 15 W pk 3 5mm m 0 38 Ib 100 MHz to 2 30 W us pulse Shipping GHz 1 10 0 5 kg 1 0 Ib 2 GHz to 12 4 GHz 1 15 12 4 GHz to 18 GHz 1 20 18 GHz to 26 5 GHz 1 25 Option 26 5 MHz to 26 5 GHz to 33 10 dBm to 20 300 mW avg APC Net 0 2 kg 0 38 8485A 33 GHz GHz 1 40 dBm 3 15 W pk 3 5mm m Ib 033 30 W us pulse Shipping 0 5 kg 1 0 Ib 8481A 10 MHz to 18 10 MHz to 30 10 dBm to 20 300 mW avg Type N m Net 0 2 kg GHz MHz 1 40 dBm 3 15 W pk 0 38 Ib 30 MHz to 50 30 W us pulse Shipping 0 5 kg MHz 1 18 1 0 Ib 50 MHz to 2 GHz 1 10 2 GHz to 12 4 GHz 1 18 12 4 GHz to 18 GHz 1 28 8482A 100 kHz to 100 kHz to 300 10 dBm to 20 300 mW avg 15 Type N m Net 0 2 kg 0 38 4 2 GHz kHz 1 60 dBm 3 pk Ib 300 kHz to 1 30 W us pulse Shipping 0 5 kg MHz 1 20 1 0 Ib 1 MHz to 2 GHz 1 10 2 GHz to 4 2 GHz 1 30 Chapter 1 Introduction Table 1 7 100 mW sensors 1 uW to 100 mW 30 dBm to 20 dBm Model Frequency Maximum SWR Power Maximum Power Connector Weight Range Linearity Type 8483A 100 kHz to 100 kHz to 600 10 dBm to 20 300 mW avg 10W Type N m Net 0 2 kg 0 38 750hm 2 GHz kHz 1 80 dBm 3 pk 75 ohm Ib 600 kHz to 2 Shipping 0 5 kg GHz 1 18 1 0 Ib 8487A 50 MHz to 50 MHz to 10 dBm to 20 300 mW avg 15 2 4 mm m Net 0 14 kg 50 GHz 100 MHz 1 15 dBm 3 pk 0 28 Ib 100 MHz to 30 W us pulse Shipping 0 5 kg 2 GHz 1 10 1 0 Ib
24. 7 Al Cartridge 08487 67110 08487 60004 Cl Fixed Capacitor 1700Pf 50v 0160 6978 0160 6978 68 Appendix B Bulkhead Assemblies Bulkhead Exploded Graphics Figure B 1 8481A and 8481B ry MP6 7 N a MP8 c 9 S 5 10 Prey Al Y D B MP 12 5 MP13 SN MEM f NZ Appendix B 69 Figure B 2 Bulkhead Assemblies 8481A Option 001 MP3 OY MP14 MP10 MP12 70 Appendix B Bulkhead Assemblies Figure B 3 8482A and 8482B Appendix B 71 Bulkhead Assemblies Figure B 4 8481D Insulated brown wire eo a ASSEMBLED VIEW 72 Appendix B Bulkhead Assemblies 8481H and 8482 Figure B 5 AuO HL88 cu 5 AluO HL8v8 Fian 73 Appendix B Bulkhead Assemblies Figure B 6 8483A MP13 A S 74 Appendix B Bulkhead Assemblies 8485A 8485A Opt 033 8485D and 8485D Opt 033 Figure B 7 75 51101534 1531 NO Ndd3 Sd JYdS JO NOLLISOd OM NO ANON ALO JVdS 0 gt Appendix B 2 _ OL dl Bulkhead Assemblies 8487 and 8487 Figure B 8 048 MJA Q3 18N3SS Y O31 V InSNI aIA 0109 048 Q31VIFISNI
25. 8 to 18 GHz 125W pk 500W us pulse 8482B 100 kHz to 4 2 100 kHz to 35 dBm to 44 0 C to 35 C 30W Type N m Net 0 8 kg GHz 2 GHz 1 10 dBm 4 avg 1 75 1b 2 GHz to 35 C to 55 C Shipping 1 5 kg 4 2 GHz 1 18 25W avg 3 25 1b 0 1 to 4 2 GHz 500W pk 500W us pulse a Negligible deviation except for those power ranges noted b For pulses greater than 30 W the maximum average power is limited by the energy per pulse E in W us according to 30 0 02 E Table 1 6 3 Watt sensors 100 uW to 3 W 10 dBm to 35 dBm Model Frequency Maximum SWR Power Maximum Power Connector Weight Range Linearity Type 8481H 10 MHz to 18 10 MHz to 25 dBm to 3 5W avg Type N m Net 0 2 kg GHz 8 GHz 1 20 35 dBm 5 100W pk 0 38 Ib 8 GHz to 100W us pulse Shipping 0 5 kg 12 4 GHz 1 25 1 0 Ib 12 4 GHz to 18 GHz 1 30 8482H 100 kHz to 4 2 100 kHz to 25 dBm to 35 3 5W avg Type N m Net 0 2 kg GHz 4 2 GHz 1 20 dBm 5 100W pk 0 38 Ib 100W us pulse Shipping 0 5 kg 1 0 Ib a Negligible deviation except for those power ranges noted Chapter 1 13 Introduction Table 1 7 100 mW sensors 1 uW to 100 mW 30 dBm to 20 dBm Model Frequency Maximum SWR Power Maximum Power Connector Weight Range Linearity Type 8485A 50 MHz to 50 MHz to 100 10 dBm to 20 300 mW avg APC Net 0 2 kg 26 5 GHz MHz 1 15 dBm
26. 9 2 to 12 4 GHz 1 20 0 091 12 4 to 18 GHz 1 29 0 127 18 to 34 GHz 1 37 0 156 34 to 40 GHz 1 61 0 234 40 to 45 GHz 1 86 0 301 45 to 50 GHz 1 89 0 310 Chapter 2 29 General Information Replaceable Parts Table 2 3 to Table 2 8 are a list of replaceable parts Figure 2 1 illustrates the major parts To order a part listed in Table 2 3 to Table 2 8 contact your nearest Agilent Technologies Sales and Service Office Figure 2 1 Illustrated Major Parts Breakdown Al NOTE NOTE MP11 22 NOT SHOWN J1 5 AND MP7 SAME AS MP10 ARE NOW PART OF A2 30 Chapter 2 General Information Table 2 3 Bulkhead Assembly Model Reference Part Number Qty Description Designator 8481A AI 08481 60004 1 Bulkhead Assembly Type N 8481A Opt 001 Al 08481 60005 1 Bulkhead Assembly Type APC 7 8482A AI 08482 60003 1 Bulkhead Assembly Type N 8483A Al 08483 60003 1 Bulkhead Assembly Type N 8485A Al 08485 60007 1 Bulkhead Assembly 3 5mm 8485A Opt 033 Al 08485 60011 1 Bulkhead Assembly 3 5mm 8487A Al 08487 60002 1 Bulkhead Assembly 2 4mm 8481B Al 08481 60019 1 Bulkhead Assembly Type N 8482B Al 08482 60011 1 Bulkhead Assembly Type N 8481D Al 08481 60145 1 Bulkhead Assembly Type N 8485D Al 08485 60008 1 Bulkhead Assembly 3 5mm 8485D Opt 033 Al 08485 60012 1 Bulkhead Assembly 3 5mm 8487D Al 08487 67002 1 Bu
27. GGER SOURCE CHANNEL 2 VOLTS DIV SV POSITION 5V 46 Chapter 3 Service Step 4 Connect the Power Sensor to channel A of the Power Meter NOTE Heat can affect the adjustments so handle the sensor as little as possible Step 5 Adjust the black white and brown white wires until the waveform shown on the oscilloscope is similar to that shown in Figure 3 2 This shows an example of a High Gain output signal with acceptable sensor offset and spike balance settings Figure 3 2 Example of an Acceptable Waveform Step 6 Allow more than 50mV variance on the sensor offset step i e from top to top or bottom to bottom of the waveform Figure 3 3 shows an example of a High Gain output signal with an unacceptably high sensor offset setting Chapter 3 47 Service Figure 3 3 Example of an Unacceptable Waveform TIP You will find that positioning the wire for switching transients affects the offset Go back and forth between the two wires positioning and repositioning until both adjustments are deemed acceptable Step 7 Reassemble the Power Sensor ensuring that the waveform shown on the oscilloscope does not change If the waveform has changed remove the cover and readjust the black white and brown white wires again 48 Chapter 3 CAUTION NOTE Step 1 Service Disassembly Reassembly Procedures Disassembly Procedure Disassemble the Power Sensor by performing the following steps Disass
28. Operating and Service Manual Agilent 8480 Series Coaxial Power Sensors This manual applies to the following models 8481A 8482A 8483A 8485A 8487A 8481B 8482B 8481H 8482H 8487D 8485D 8481D ee Agilent Technologies Manufacturing Part Number 08481 90173 March 15 2012 Copyright 2003 2012 Agilent Technologies Errata This manual may contain references to HP or Hewlett Packard Please note that Hewlett Packard s former test and measurement semiconductor products and chemical analysis businesses are now part of Agilent Technologies To reduce potential confusion the only change to product numbers and names has been in the company name prefix where a product number name was HP XXXX the current name number is now Agilent XXXX For example model number HP8648 is now model number Agilent 8648 Ce manuel peut contenir des r f rences lt lt HP gt gt ou lt lt Hewlett Packard gt gt Veuillez noter que les produits de test et mesure de semi conducteur et d analyse chimique qui avaient fait partie de la soci t Hewlett Packard sont maintenent une partie de la soci t Agilent Technologies Pour reduire la confusion potentielle le seul changement aux noms de reference a t dans le pr fixe de nom de soci t l ou un nom de r f rence tait HP XXXX le nouveau nom de r f rence est maintenant Agilent XXXX Par example le HP 8648 s appelle maintenent Agilent 8648 Diese Gebrauchsanweiseung kann Bezug nehmen auf
29. Step 2 Remove the power meter handle To remove the handle pull the 2 ends as shown in Figure A 2 Figure A 2 Pull Pull Step 3 Remove the power meter cover To remove the cover slide it open as shown in Figure A 3 Figure A 3 Slide cover this direction 56 Appendix A EPM Series Power Meter E4418B Modification Step 4 Figure A 4 shows the power meter with its cover removed Figure A 4 Step 5 Use the razor blade or craft knife to remove three hole plugs in the rear panel as shown in Figure A 5 Figure A 5 Appendix A 57 EPM Series Power Meter E4418B Modification Step 6 Figure A 6 shows a different view of the holes in the rear panel Figure A 6 Step 7 Using the three lengths of AWG 20 wire strip away 2cm from each end of the wires Solder an end of each wire onto the screw fit BNC female connectors as shown in Figure A 7 Figure A 7 58 Appendix A EPM Series Power Meter E4418B Modification Step 8 Securely fit the three BNC connectors into the three holes in the rear panel as shown in Figure A 8 Use the 25 Ib in torque wrench to tighten the nuts Figure A 8 Step 9 The Measurement PCB A6 must now be modified The call outs in Figure A 9 show where the three wires need to be soldered Solder a wire into each hole Chop Low Gain and High Gain Outputs Take care not to over heat the PCB as this may damage the trace Figure A 9 3333 wj 33
30. These uncertainties only apply to Option 033 Chapter 1 11 Introduction Table 1 4 Typical measurement uncertainties of Calibration Factor CF data printed on the power sensor Frequency 25 C 8487A 8481B 8482B 8481H 8482H 8487D 8485D 8481D 100 kHz to 10 MHz 1 50 0 91 10 MHz to 30 MHz 1 48 1 44 0 86 0 81 0 77 30 MHz to 500 MHz 1 38 1 48 1 51 0 88 0 92 1 33 1 24 0 81 500 MHz to 1 2 GHz 1 34 1 48 1 48 0 87 0 88 1 35 1 26 0 81 1 2 GHz to 6 GHz 1 41 1 54 1 53 0 98 0 95 1 41 1 35 0 97 6 GHz to 14 GHz 1 59 1 71 1 36 1 62 1 63 1 20 14 GHz to 18 GHz 1 69 1 99 1 71 1 73 1 83 1 72 18 GHz to 26 5 GHz 2 23 2 25 2 45 26 5 GHz to 33 GHz 2 58 2 55 2 94 33 GHz to 34 GHz 2 73 3 08 34 GHz to 35 GHz 2 73 3 08 35 GHz to 40 GHz 2 73 3 08 40 GHz to 45 GHz 3 67 4 28 45 GHz to 50 GHz 4 33 4 72 These uncertainties only apply to Option 033 12 Chapter 1 Introduction Table 1 5 25 Watt sensors 1 mW to 25 W 0 dBm to 44 dBm Model Frequency Maximum SWR Power Maximum Power Connector Weight Range Linearity Type 8481B 10 MHz to 18 10 MHz to 35 dBm to 09 to 35 C Type N m Net 0 8 kg GHz 2 GHz 1 10 44 dBm 4 avg 1 75 1b 2 GHz to 35 C to 55 C Shipping 1 5 kg 12 4 GHz 1 18 25W avg 3 25 Ib 12 4 GHz to 0 01 to 5 8 GHz 18 GHz 1 28 500W pk 5
31. dels Reference Part Description Sensor Model Designator 8481H 8482H MP25 Inner Conductor Spacer 5020 8540 or 08742 0005 5020 8540 or 08742 0005 MP26 Flat Washer 2190 0831 or 3050 0622 AI Cartridge 08481 60042 08482 60019 A2 Cartridge Assembly 08481 60011 08481 60011 Appendix B 65 Bulkhead Assemblies Table B 4 Bulkhead Parts for the 8483A Model Reference Part Description Sensor Model Designator 8483A MP1 Connector Nut 5021 7255 MP2 Connector Component 1250 0016 MP3 Connector Body 1250 2132 MP4 Center Conductor 75 Ohm 08483 20003 MP5 Insulator 5020 8593 MP6 Center Contact 75 Ohm 08483 20002 MP7 Compression Spring 1460 0526 MP8 Sliding Contact 08491 2009 MP9 Bulkhead 08481 20015 MP10 Inner Conductor Spacer 00909 20006 MP11 Cap Nut 08481 20016 MP12 Information Label 7120 4351 MP13 Protective Cap 1401 0099 MP14 Outer Conductor Spacer 5021 0830 or 08742 0006 Al Cartridge 08483 60010 66 Appendix B Bulkhead Assemblies Table B 5 Bulkhead Parts for the 8485A and 8485D Models Reference Part Description Sensor Model Designator 8485A 8485D 8485A Opt 033 8485D Opt 033 MP1 Connector Nut 08485 20005 08485 20005 MP2 Connector Component 1250 0016 1250 0016 MP3 Bulkhead 08485 20011 08485 20011 MP4 Outer External Coax 5021 7092 5021 7092 5 Outer Conductor Spacer 00281 20046 00281 20046 MP6 Cen
32. dge 08481 60041 Flat Washer 2190 0831 or 3050 0622 Appendix B 63 Bulkhead Assemblies Table B 3 Bulkhead Parts for the 8481H and 8482H Models Reference Part Description Sensor Model Designator 8481H 8482H MP1 Connector Nut 5021 7255 5021 7255 MP2 Connector Component 1250 0016 1250 0016 MP3 Connector Body 1250 2132 1250 2132 MP4 Contact Assembly 1250 0917 1250 0917 MP5 Insulator 5040 0306 5040 0306 MP6 Center Conductor Cartridge Adapter 5020 3296 5020 3296 MP7 Compression Spring 1460 0977 1460 0977 MP8 Sliding Contact 5020 3297 5020 3297 MP9 Housing 08492 2000 08492 2000 MP10 Attenuator Adapter 5021 0154 5021 0154 MP11 Sliding Contact 5020 3297 5020 3297 MP12 Compression Spring 1460 1547 1460 1547 MP13 Contact Holder 5021 0157 5021 0157 MP14 Insulator 5040 0306 5040 0306 15 Center Conductor Cartridge Adapter 5020 3296 5020 3296 MP16 Compression Spring 1460 0977 1460 0977 MP17 Sliding Contact 5020 3297 5020 3297 MP18 Bulkhead 08481 20015 08481 20015 MP19 Cap Nut 08481 20016 08481 20016 MP20 Protective Cap 1401 0099 1401 0099 MP21 Polyiron 08481 40006 MP22 Flat Washer 3050 0622 3050 0622 MP23 Flat Washer 3050 0622 3050 0622 MP24 Outer Conductor Spacer 5021 0830 or 08742 0006 5021 0830 or 08742 0006 64 Appendix B Bulkhead Assemblies Table B 3 Bulkhead Parts for the 8481H and 8482H Mo
33. embly must be performed in sequence described in the following procedure otherwise damage may be caused to the two gold wires between the bulkhead assembly and the Power Sensor Board Assembly If these wires are damaged the 1 Bulkhead Assembly must be replaced Every Power Sensor has an individually prepared label on the housing If more than one power sensor is disassembled at a time be sure to mate the correct Power Sensor and housing when reassembling Insert the blade of a large screwdriver between the two piece plastic shell at the rear of the Power Sensor Gently pry the sections apart See Figure 3 4 Chapter 3 49 Service Figure 3 4 Removing the Power Sensor s Cover Step 2 At the other side of the sensor again pry the cover shell sections apart Remove the shells and the inner magnetic shields Step 3 Position the Power Sensor as shown in Figure 3 5 top The small hole 5 should be on the left side of the RF input connector Remove the allen cap screws 1 2 10 and 13 Loosen 11 and 12 Remove the upper chassis from the Power Sensor Step 4 Remove the spring clamp cap screw 7 to free the gold leads which come from the Bulkhead Assembly Step 5 Remove cap screws 3 4 and 5 Step 6 Slide the Bulkhead Assembly straight out from the chassis Step 7 Remove cap screws 8 9 11 12 14 and 15 Step 8 Lift the A2 Input Amplifier and J1 connector out of the chassis 50 Chapter 3 Service Figure 3 5 Power Se
34. er Qty Description 8481A 08481 80002 1 8481A ID Label 8482A 08482 80002 1 8482A ID Label 8483A 08483 80001 1 8483A ID Label 8485A 08485 80002 1 84854 ID Label 8487A 08487 80001 1 8487A ID Label 8481B 08481 80004 1 8481B ID Label 8482B 08482 80003 1 8482B ID Label 8481D 08481 80011 1 8481D ID Label 8485D 08485 80003 1 8485D ID Label 8487D 08487 80004 1 8487D ID Label 8481H 08481 80003 1 8481H ID Label 8482H 08482 80001 1 8482H ID Label Chapter 2 33 General Information Table 2 8 Miscellaneous Labels Part Number Qty Description 08481 80115 1 Cal Label Blank For Zebra brand printers 08486 80006 1 Cal Label Blank For impact printers 08481 80005 1 Mylar Overlay For use with Cal Label 08486 80006 08486 80005 1 Side Label Agilent Branding 7121 2422 1 Side Label Caution For all models except 8487A 8487D 08487 80002 1 Side Label Caution For 8487A 8487D 00346 80011 1 Information Label For 8481D 8485D 8487D 34 Chapter 2 Service This Service chapter contains information about principles of operation troubleshooting and repair of the Agilent Coaxial Power Sensors Chapter 3 35 Service Principles of Operation Thermocouple Sensors The Al Bulkhead Assembly presents a 50 Ohm load 75 Ohm for model 8483A to the RF source The RF signal is coupled through a dc blocking capacitor and absorbed by the thermocouples generating a dc voltage proportional to the RF
35. gilent XXXX Por ejemplo el modelo HP8648 es ahora Agilent 8648 REN E MH ERC CUBO SERM ez elo H HERTHA 22142 2 p PE 54348648 HS ESE 28648 Ne Document Part Number 5971 2668 Printed in the UK December 2010 Agilent Technologies HP YHP Agilent L ZW HP 4294A Agilent 42944 Go Notice The information contained in this document is subject to change without notice Agilent Technologies makes no warranty of any kind with regard to this material including but not limited to the implied warranties of
36. h it is affected by very small temperature differences between its components After performing any soldering in the unit wait several hours for the unit to reach thermal equilibrium before using or testing 1t 1 Use a temperature controlled 600F 311C with a zero crossover tip 2 Usealow temperature RMA flux SN 62 solder 3 Do not attempt to remove flux residue from around solder joints Using a cleaning solution may spread the flux over the entire assembly in a thin sticky layer 44 Chapter 3 NOTE Service FET Balance Adjustment The FET balance adjustment should be performed if the wires connecting J1 the sensor cable connector to A2 the power sensor board assembly have been moved If you have replaced A2 assembly or moved the wires during troubleshooting you need to perform this adjustment You do not need to perform a FET balance adjustment after an A1 bulkhead assembly replacement if the wires between J1 and A2 have not been disturbed Equipment Required Oscilloscope BNC cables 2 required Power Meter Modified as described in Appendix A Test Description This test applies to both thermocouple and diode power sensors Among the required equipment is a modified E4418B Power Meter The High Gain output of the power meter is connected to Channel 1 of an oscilloscope and the Chop Output 220Hz square wave of the power meter 15 connected to the oscilloscope trigger the High Gain output is the amp
37. he 8480 series power sensors place a 50 ohm load on the RF or microwave source except the 8483A which has a 75 ohm load The power meter indicates the power dissipated in this load in mW or dBm The coaxial power sensors in the 8480 series measure power levels from 70 dBm to 44 dBm 100 pW to 25 W at frequencies from 100 kHz to 50 GHz To cover this wide dynamic power range both thermocouple and diode power sensing elements are used Both types of power sensing elements have a maximum 50 dB dynamic range Thermocouple sensors have a square law region from 30 dBm to 20 dBm and with an attenuator can operate up to 44 dBm There are three model types of thermocouple sensors in the 8480 series covering the complete 30 dBm to 44 dBm range The A models cover 30 dBm to 20 dBm The H models cover from 10 dBm to 435 dBm The B models cover from 0 dBm to 44 dBm Diode detectors D models have the best sensitivity having an operating range from 70 dBm to 20 dBm Calibration factor CAL FACTOR data is provided on a label attached to the power sensor s cover Maximum uncertainties of the CAL FACTOR data are listed in the Specifications section in page 11 This calibration factor is used to adjust the power meter to suit the particular power sensor and frequency being measured For the B models in the 8480 series calibration factor data is valid only when the sensor is used with the supplied attenuator Chapter 1 3 Figure
38. ies with the square of the RF power across the 50 Ohm load Thus the voltage varies with the RF power dissipated in the load This low level DC voltage is passed on gold wires through ferrite beads and A2E2 The ferrite beads increase the self inductance of the gold wires causing this portion of the wires to provide the properties of an RF choke The result 1s to minimize RF feedthrough to the A2 Power Sensor Board Assembly The dc output from the bulkhead assembly is applied to the two field effect transistors FETs in A2UI These transistors function as a sampling gate or chopper The sampling rate is controlled by a 220 Hz square wave supplied by the power meter The amplitude of the sampling gate output at pin 3 of A2U1 is a 220 Hz square wave proportional to the power input The sampled 220 Hz ac output is applied to the input amplifier A2Q1 which is the input stage for an operational amplifier The A2 Power Sensor Board Assembly also contains various components that comprise a shaping network This network brings about a linear change in the amplitude of the square wave output as RF input power changes shaping network 18 necessary in diode power sensors to compensate for the characteristics of the thermocouple type shaping in the power meter and to make minor diode corrections In order to bring about a linear change in amplitude the components in this network are factory selected to match variations of the diode assembly in the
39. lified version of the Power Sensor chopped signal Ideally when no RF power is applied to the power sensor the High Gain output signal displayed on the oscilloscope is a straight line If there is a sensor offset the offset signal is visible on the oscilloscope as a square wave chopped signal Also a switching transient spike usually occurs at the edge of the chopped signal due to the switching of the FET in the Power Sensor Sensor offset and spike balance are affected by the relative positions of the wires connected to pins G and H of connector J1 One wire is black and white the other is brown and white Moving the black and white wire adjusts the amplitude of the switching transient spike Moving the brown and white wire changes the offset Once positioned care must be taken not to displace these wires To correctly position these wires perform the FET Balance Procedure on page 46 Chapter 3 45 Service FET Balance Procedure Step 1 Set the Power Meter as follows CAL FACTOR 100 POWER REF ON Step 2 Connect the HIGH GAIN OUTPUT on the modified Power Meter to CHANNEL 1 on the Oscilloscope and set it up as follows POSITION 0 Volts centered COUPLING AC PROBE 1 1 DISPLAY AVERAGE AVERAGE 8 VECTORS ON GRID ON MAIN DELAYED MAIN TIME REF CENTER TIME DIV 500us VOLTS DIV 50 mV Step 3 Connect the CHOP OUTPUT on the modified Power Meter to CHANNEL 2 on the Oscilloscope and set it up as follows MODE AUTO LEVEL TRI
40. lkhead Assembly 2 4mm 8481H Al 08481 60014 1 20dB Bulkhead Assembly Type N 8482H Al 08482 60009 1 20dB Bulkhead Assembly Type N Chapter 2 31 General Information Table 2 4 Power Sensor Board Assemblies Model Reference Part Number Qty Description Designator 848xA A2 5061 0982 1 Power Sensor Board Assembly 8481B 8482B A2 08481 60039 1 Power Sensor Board Assembly 8481D 8485D 8487D A2 5061 0983 1 Power Sensor Board Assembly 8481H 8482H A2 08481 60040 1 Power Sensor Board Assembly Table 2 5 Common Chassis Components Reference Designator Part Number Qty Description MP1 MP2 5040 6998 2 Plastic Shell MP3 MP4 08481 20011 2 Chassis MP6 1460 1978 1 Compression Spring MP8 MP9 08481 00002 2 Shield MP10 MP22 0515 0879 13 Screw MP23 3030 0436 1 Screw MP24 5040 6939 1 Clamp MP25 5040 6940 1 Block 32 Chapter 2 General Information Table 2 6 Adapters and Attenuators Model Part Number Qty Description 8483A 1250 0597 1 50 Ohm to 75 Ohm Coax Adapter 8485A 8485D 08485 60005 1 3 5mm to N m Coax Adapter 8487A 8487D 08487 60001 1 2 4mm to N m Coax Adapter 8481B 08498 60001 1 Coaxial Fixed 30dB Attenuator 8482B 08498 60010 1 Coaxial Fixed 30dB Attenuator 8481D 8485D 8487D 11708 60001 1 Precision 30dB Attenuator Table 2 7 Identification Labels IModel Part Numb
41. new or restored A1 Bulkhead Assembly fromTable 2 1 on page 24 Follow the disassembly and reassembly procedures for Bulkhead removal and replacement See Disassembly Reassembly Procedures on page 49 Check the FET balance using the procedure described in FET Balance Adjustment on page 45 If you did not disturb the wires it is likely that no adjustment is necessary Place the new calibration sticker on the plastic shell of the Power Sensor Although the recommended Bulkhead strategy is to completely replace it we are aware that some customers have both the ability and experience that enables them to disassemble and repair Bulkheads to a lower level For this reason Appendix B provides exploded views of the various Bulkheads and tables listing the parts Lower level Bulkhead repair can be more economical than replacement although this may be offset by the need to invest in sensor calibration equipment and a SWR test set up Chapter 3 43 Service A2 Power Sensor Board Assembly Repair Strategy The recommended repair strategy for the A2 Power Sensor Board Assembly is to completely replace it Replacing this assembly is usually less costly than the time it takes to troubleshoot and replace faulty components Procedure When replacing the A2 Power Sensor Board Assembly some soldering is required in order to remove and replace the wires from connector J1 Remember that the Power Sensor is a highly sensitive device As suc
42. not an impedance transformer therefore an impedance mismatch exists that must be taken into consideration when calibrating the power meter and sensor The REF CAL FACTOR on the power sensor label has been adjusted for the impedance mismatch This REF CAL FACTOR when used to calibrate any power meter will allow calibration to 1 000 mW The CAL FACTOR from the data on the sensor label should be used for any power measurements in a 75 ohm system at 50 MHz Remove the mechanical adapter from the power sensor before connecting the sensor to a 75 ohm source Mechanical Adapter 8483A Only D model 8480 series sensors 8481D 8485D 8485D 033 and 8487D D model sensors are supplied with a 11708A 30 dB attenuator To calibrate a D model sensor the 1 mW 50 MHz Power Reference supplied by the power meter must be reduced to 1uW The reference attenuator provides the means to do this Chapter 1 7 Introduction Table 1 2 11708A 30 dB attenuator characteristics Characteristic Limits Comments 11708A accuracy at 30 0 05 dB Accuracy traceable to National Institute of 50 MHz 25 C Standards and Technology NIST with a temperature coefficient typically 0 003 dB per Dimensions Length 60 mm 2 4 in Diameter 20 mm 0 8 in NOTE The 11708A 30 dB attenuator is intended for use only at the 1 mW 50 MHz power reference of the power meter Its function as a calibration reference may be compromised if
43. nsor Hardware Locations HIDDEN Reassembly Procedures CAUTION The gold wires connecting the A1 Bulkhead Assembly and the A2 Power Sensor Board Assembly are extremely delicate and may be easily broken Be careful when working around them Step 1 Set the printed circuit board and connector into place as shown in Figure 3 5 bottom view Chapter 3 51 Step 2 Step 3 Step 4 Step 5 Step 6 CAUTION Step 7 Step 8 Step 9 Step 10 Step 11 Service Insert cap screws 8 9 11 12 14 and 15 but do not tighten Center the circuit board so there is equal air gap between each side and the chassis Tighten 8 9 14 and 15 Insert screw 3 4 and 5 Tighten only screw 5 With small hole 5 to the left carefully insert the gold leads on A1 bulkhead assembly through the holes in the black plastic guide on A2 input amplifier Using tweezers position the ends of the gold wires over the electrical pads DO NOT tighten clamp screw 6 excessively or the FET circuit may be broken Place and hold plastic clamp 16 over the gold wires As you tighten the clamp screw watch the compression spring Tighten the clamp screw 7 only until the spring coils touch Any further tightening could damage the FET circuit Place the upper chassis in position and insert cap screws 1 2 10 and 13 Tighten 1 2 3 and 4 Tighten 10 11 12 and 13 Place the plastic shells magnetic shields and the chassis together a
44. ntified refer to the repair section in either the 1 Bulkhead Assembly on page 43 or the 2 Power Sensor Board Assembly on page 44 The FETs in A2UI are light sensitive and dc levels are shifted slightly when the FETs are exposed Excessive power damages the Power Sensor Electrostatic discharge renders the Power Sensor inoperative Troubleshooting and Repair procedures must be carried out at a static free workstation Troubleshooting Eliminating the Power Meter and Sensor Cable Where a known good power meter and or sensor cable is unavailable another means must be used to isolate the fault to the Power Sensor This is done by ensuring the power meter is providing the correct 220Hz drive Chapter 3 39 CAUTION Step 1 Step 2 Step 3 Service signal Check the following levels of the square wave with an oscilloscope e At the black white wire 0 05 0 05 Vdc top of square wave At the brown white wire 9Vdc bottom of square wave If the levels are incorrect then the power meter or sensor cable is at fault Refer to the power meter service manual for troubleshooting information If the levels are correct then the Power Sensor is at fault Continue by troubleshooting the Al Bulkhead Assembly Troubleshooting Power Sensors The most common cause of Power Sensor failure is the application of power levels beyond the specified tolerance The second most common cause of failure is applying
45. put RF or microwave power connected to the sensor input and temperature compensation is provided by a thermistor located in amplifier feedback path 4 Chapter 1 Introduction Dimensions The physical dimensions of the power sensors differ in the model types This is due to the additional attenuation used to obtain the high power performance Table 1 1 8480 Series Power Sensor Dimensions including the RF Connector 8480 series power Dimensions sensor models A models 8481A 8482A and 8483A 38 mm wide 30 mm high 105 mm long 1 5 in x 1 2 in x 4 1 in 8485A and 84874 38 mm wide 30 mm high 95 mm long 1 5 in x 1 25 in x 3 75 in B models 83 mm x 114 mm x 248 mm approx 3 25 in x 4 50 in x 9 75 in D models 8481D and 8485D 38 mm wide 30 mm high 102 mm long 1 5 in x 1 2 in x 4 02 in 8487D 38 mm wide 30 mm high 94 mm long 1 5 in x 1 2 in x 3 7 in H models 38 mm wide 30 mm high 149 mm long 1 5 in x 1 2 in x 5 9 in CAUTION Do not disassemble the power sensor The 8480 series power sensors are static sensitive and can be easily damaged 8480 series B models information The 25 W 44 dBm power sensor is a calibrated combination of a 30 dB 25 W attenuator assembly and a sensor assembly The attenuator and sensor assemblies are calibrated as a set and must be used together if specified accuracies are to be obtained This combination is referred to as the power sensor Chapte
46. r 1 5 CAUTION WARNING Introduction Removal of the D ring that is on the sensor assembly WILL VOID THE WARRANTY The input connector on the sensor has a D ring to prevent the sensor from being connected to a high power source when its attenuator 15 not attached The sensor must only be connected to the power meter for calibration or to the high power attenuator for RF measurement Safety Considerations The warning that follows is related to possible personal injury The high power attenuator contains a substrate of beryllium oxide Beryllium oxide in a powder form is a hazardous material and may be injurious to your health if inhaled Do not perform any operation on the beryllium oxide that might generate dust Defective attenuator should be returned to Agilent Technologies for proper disposal 8480 series Options 8485A and 8485D option 033 The 8485A and 8485D power sensors with option 033 are calibrated to measure power levels in the 50 MHz to 33 GHz frequency range In all other respects they are the same as their respective standard power sensor Accessories Supplied Accessories are required to connect various power sensors to the power meter s 50 ohm Power Reference 1 mW 50 MHz output connector Type N f 6 Chapter 1 CAUTION Figure 1 3 Introduction 8483A 75 ohm sensor The 84834 sensor 1s supplied with an adapter shown in Figure 1 3 This accessory is a mechanical adapter only
47. r beat eoe t eese eR ae ex ege ee es 20 Power Meter 20 Operating 1 21 Contents Power 21 Modulation Effects eerte ete VOR closes eee 21 2 General Information Recommended Test Equipment 24 Connector Cafe snae ULIS wee oes 25 TORQUE e rcm e RI A TAD eae aces PRA 25 Performance Test eed EE GEES 26 Standing Wave Ratio SWR and Reflection Coefficient Rho Performance Test 26 ReplaceablePartS oy 30 3 Service Principles of Operation 36 Thermocouple 018 36 Diode Sensors ees RAT IURE URP EE 37 Troubleshooting teen ARMEN BUR INR E CRUS ENDE 39 Troubleshooting Eliminating the Power Meter and Sensor Cable 40 Troubleshooting Power Sensors 40 1 Bulkhead Thermocouple Sensors 40 1 Bulkhead Diode 41 A2 Power Sensor Board Assembly 42 cess chains hire duds 43 Al Bulkhead
48. s shown in Figure 2 1 Snap the plastic shells together 52 Chapter 3 EPM Series Power Meter 4418 Modification This Appendix describes the modification procedure for adapting an E4418B Power Meter to allow it to be used for the 8480 Series Power Sensor FET Balance Adjustment 53 EPM Series Power Meter E4418B Modification The Material and Tools Required The following material and tools are required for this modification T 15 torque screwdriver Razor blade or Craft Knife Three 30 cm lengths of AWG 20 single core wire Three screw fit BNC Female connectors Agilent Part Number 1250 0118 A fine tip marker pen and adhesive labels A 10 20 Watt pencil tip soldering iron 60 40 0 8 mm rosin activated core solder wire A Wire stripper 25 b in Torque Wrench Size 7 16 in AF Impact on Warranty NOTE Please be aware that doing this modification requires you to open the power sensor Therefore as stated earlier any attempt to disassemble the power sensor will void the warranty 54 Appendix A EPM Series Power Meter E4418B Modification Modification Procedure CAUTION Precautions must be taken to protect the Power Meter s PCBs from Electrical Static Damage ESD Step 1 Using the T 15 torque screwdriver remove the two screws shown in Figure A 1 Figure A 1 Remove these 2 screws Appendix A 55 EPM Series Power Meter E4418B Modification
49. sensors described in this manual are warranted and certified as indicated on the inside cover of this manual Power sensors are warranted only when they are operated within their specifications especially the maximum power handling capability Any power sensor returned to Agilent Technologies under warranty will be examined carefully to determine if the failure was possibly due to improper use Do not open the power sensor Any attempt to disassemble the power sensor will void the warranty 10 Chapter 1 NOTE 8480 Series Power Sensor Specifications These specifications are valid with EPM and EPM P Series of power meters Introduction The 8480 series thermocouple and diode power sensors provide accuracy stability and SWR over a wide range of frequencies 100 kHz to 50 GHz and power levels 70 dBm to 44 dBm Table 1 3 Typical measurement uncertainties of Calibration Factor CF data printed on the power sensor Frequency 25 C 3 C 8481A 8482A 8483A 8485A 100 kHz to 10 MHz 0 87 1 59 10 MHz to 30 MHz 0 81 0 8 1 39 30 MHz to 500 MHz 0 78 0 8 1 41 1 29 500 MHz to 1 2 GHz 0 78 0 8 1 41 1 26 1 2 GHz to 6 GHz 0 92 0 9 1 46 1 35 6 GHz to 14 GHz 1 16 1 61 14 GHz to 18 GHz 1 59 1 77 18 GHz to 26 5 GHz 2 47 26 5 GHz to 33 GHz 3 35 33 GHz to 34 GHz 34 GHz to 35 GHz 35 GHz to 40 GHz 40 GHz to 45 GHz 45 GHz to 50 GHz
50. ter Conductor 5040 6958 5040 6958 MP7 Center Internal Coax 5021 7093 5021 7093 MP8 Bellows 0955 0238 0955 0238 MP9 Outer Internal Coax 5021 7091 5021 7091 MP10 Bellows Spacer 5021 9206 5021 9206 MP11 Matching Washer 5021 7094 or 08485 20024 5021 7094 or 08485 20024 MP12 Feed Thru Insulator 08486 40001 08486 40001 MP13 Cap Nut 08486 20007 08486 20007 A1 Cartridge 08485 60015 08481 60041 Fixed Capacitor 1300Pf 50v 0160 4746 0160 4746 Appendix B 67 Bulkhead Assemblies Table B 6 Bulkhead Parts for the 8487A and 8487D Models Reference Part Description Sensor Model Designator 8487A 8487D MP1 Connector Nut 5021 7081 5021 7081 MP2 Connector Component 1250 0016 1250 0016 MP3 Bulkhead 08487 20001 08487 20001 MP4 Outer External Coax 08487 20002 08487 20002 MP5 Pin Depth Washer 08487 00001 08487 00001 MP6 Center Contact 1250 2115 1250 2115 MP7 Bead Ring Assembly 1250 2107 1250 2107 MP8 Internal Center Conductor 08487 20003 08487 20003 MP9 Bellows 0955 0333 0955 0333 MP10 Outer Internal Coax 08487 20004 08487 20004 MP11 Matching Washer 08487 20006 08487 20005 or 08487 20006 08487 20005 or 08487 20007 08487 20007 MP12 Matching Washer 08487 20011 or 5022 2866 or 08487 20011 or 5022 2866 or 5022 2878 or 5022 3611 5022 2878 or 5022 3611 MP13 Polyiron 08673 20046 MP14 Feed Thru Insulator 08486 40001 08486 40001 15 Cap Nut 08486 20007 08486 2000
51. y The sensitivity of the power sensor is influenced by ambient temperature The sensor should be recalibrated at each change in temperature to obtain the most accurate results Typical temperature sensitivity variations are shown in Figure 1 7 for the 8481D power sensor 20 Chapter 1 Introduction Figure 1 7 Typical Influence of Temperature on Sensitivity Temperature 9C 0 10 20 30 40 50 60 Sensitivity Change dB Operating Instructions To operate the Power Sensor refer to the operating instructions in of the power meter s user s guide Power Measurements To correct for varying responses at different frequencies a cal factor table is included on the Power Sensors To use the cal factor at the frequency of interest adjust the power meter s CAL FACTOR control according to the instructions in the power meter s user s guide Modulation Effects When measuring RF or microwave sources that are modulated at the chopper frequency nominally 220 Hz at the first or second harmonic or submultiples of the chopper frequency beat notes may occur Unless these beat notes are exactly the chopper frequency they can usually be eliminated by averaging filtering since the amplitudes are plus and minus the actual power These frequencies may also be avoided by changing the modulation frequency slightly if possible Refer to the power meter s user s guide for information on setting the averaging filtering Chapter 1 21 Introduction
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