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 Manufacturing Part Number: 08481-90173 December 2010 © Copyright 2003-2010 Agilent Technologies.
5971-2668 Small.fm Page 1 Wednesday, September 22, 2004 2:20 PM 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.
マニュアル・チェンジ 変更 本文中の「HP（YHP）」、または「(横河)ヒューレット・パッカード株式会社」とい う語句を、「Agilent」、または「アジレント・テクノロジー株式会社」と変更して ください。 ヒューレット・パッカード社の電子計測、半導体製品、化学分析ビジネス部門は分 離独立し、アジレント・テクノロジー社となりました。 社名変更に伴うお客様の混乱を避けるため、製品番号の接頭部のみ変更しておりま す。 （例: 旧製品名 HP 4294A は、現在 Agilent 4294A として販売いたしておりま す。）
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 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.
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) < 70 dB(A). Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenlärminformationsverordnung vom 18 Januar 1991.
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Contents 1. Introduction General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Instruments Covered by Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents Power Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Modulation Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. General Information Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Connector Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Torque . . . . . . . . .
Contents FET Balance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Equipment Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 FET Balance Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 Disassembly / Reassembly Procedures . . . .
Contents 4
1 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.
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 numbers), and the suffix (the last four numbers). Refer to the Example Serial Number shown in Figure 1-1. Figure 1-1 Example Serial Number The two letters identify the country in which the unit was manufactured. "US" represents the USA and "MY" represents Malaysia.
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.
Introduction Figure 1-2 8480 Series Power Sensor Simplified Block Diagram Cable Balanced Chopper Power Sensing Element Input Thermocouple or Diode AC Signal Thermistor Feedback Autozero 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 µV).
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 sensor models Dimensions 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 8487A: 38 mm wide, 30 mm high, 95 mm long (1.5 in. x 1.25 in. x 3.75 in.
Introduction CAUTION 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 is 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.
Introduction 8483A 75 ohm sensor The 8483A sensor is supplied with an adapter, shown in Figure 1-3. This accessory is a mechanical adapter only, 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.
Introduction Table 1-2 11708A 30 dB attenuator characteristics Characteristic Limits Comments 11708A accuracy at 50 MHz, 25 °C 30 ± 0.05 dB Accuracy traceable to National Institute of Standards and Technology (NIST), with a temperature coefficient typically 0.003 dB per °C. 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.
Introduction Figure 1-4 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). NOTE The 2.4mm to Type-N adapter is intended for use only at the 1 mW, 50 MHz power reference of the power meter.
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 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.
Introduction 8480 Series Power Sensor Specifications NOTE These specifications are valid with EPM and EPM-P Series of power meters. 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.
Introduction Table 1-4 Typical measurement uncertainties of Calibration Factor (CF) data printed on the power sensor Frequency 25°C ± 3°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.
Introduction Table 1-5 Model 8481B 25 Watt sensors, 1 mW to 25 W (0 dBm to +44 dBm) Frequency Range Maximum SWR 10 MHz to 18 GHz 10 MHz to 2 GHz: 1.10 Power Maximum Power Connector Type Weight 0°C to 35°C: 30W Type-N(m) avgb Net: 0.8 kg (1.75 lb) 2 GHz to 12.4 GHz: 1.18 35°C to 55°C: 25W avg Shipping: 1.5 kg (3.25 lb) 12.4 GHz to 18 GHz: 1.28 0.01 to 5.8 GHz: 500W pk Linearitya +35 dBm to +44 dBm: ±4% 5.8 to 18 GHz: 125W pk 500W.µs / pulse 8482B 100 kHz to 4.2 GHz 100 kHz to 2 GHz: 1.
Introduction Table 1-7 Model 8485A 100 mW sensors, 1 µW to 100 mW (–30 dBm to +20 dBm) Frequency Range Maximum SWR 50 MHz to 26.5 GHz 50 MHz to 100 MHz: 1.15 Power Maximum Power Connector Type Weight 300 mW avg, 15 W pk APC 3.5mm(m) Net: 0.2 kg (0.38 lb) Linearitya +10 dBm to +20 dBm: ±3% 30 W.µs / pulse 100 MHz to 2 GHz: 1.10 Shipping: 0.5 kg (1.0 lb) 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 8485A -033 8481A 26.5 MHz to 33 GHz 26.
Introduction Table 1-7 Model 8483A (75ohm) 100 mW sensors, 1 µW to 100 mW (–30 dBm to +20 dBm) Frequency Range Maximum SWR 100 kHz to 2 GHz 100 kHz to 600 kHz: 1.80 Power Maximum Power Connector Type Weight 300 mW avg, 10W pk Type-N(m) Net: 0.2 kg (0.38 lb) Linearitya +10 dBm to +20 dBm: ±3% (75 ohm) Shipping: 0.5 kg (1.0 lb) 600 kHz to 2 GHz: 1.18 8487A 50 MHz to 50 GHz 50 MHz to 100 MHz: 1.15 +10 dBm to +20 dBm: ±3% 100 MHz to 2 GHz: 1.10 300 mW avg, 15W pk 30 W.µs / pulse 2.
Introduction Table 1-8 High sensitivity sensors, 100 pW to 10 µW (–70 dBm to –20 dBm) Model Frequency Range Maximum SWR Power Linearitya Maximum Power Connector Type Weight 8481Db 10 MHz to 18 GHz 10 MHz to 30 MHz: 1.40 -30 dBm to -20 dBm: ±1% 100 mW avg, 100 mW pk Type-N (m) Net: 0.16 kg (0.37 lb) Shipping: 0.5 kg (1.0 lb) 30 MHz to 4 GHz: 1.15 4 GHz to 10 GHz: 1.20 10 GHz to 15 GHz: 1.30 15 GHz to 18 GHz: 1.35 8485Db 50 MHz to 26.5 GHz 50 MHz to 100 MHz: 1.
Introduction Table 1-8 High sensitivity sensors, 100 pW to 10 µW (–70 dBm to –20 dBm) Model Frequency Range Maximum SWR Power Linearitya Maximum Power Connector Type Weight 8487Db 50 MHz to 50 GHz 50 MHz to 100 MHz: 1.19 -30 dBm to -20 dBm: ±2% 100 mW avg, 100 mW pk 2.4 mm (m) Net: 0.2 kg (0.38 lb) 100 MHz to 2 GHz: 1.15 10 W.µs / pulse Shipping: 0.5 kg (1.0 lb) 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 a.
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.
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.
Introduction Operation Environment The operating environment for the Power Sensor should be as follows: Temperature 0 to +55oC Relative humidity <95% Altitude < 4,572 metres (15,000 ft.) Operating Precautions Before the Power Sensor is connected, the following precautions must be observed. WARNING BEFORE CONNECTING THE POWER SENSOR TO ANOTHER INSTRUMENT, ensure that the instrument and power meter are connected to the protective (earth) ground.
Introduction Figure 1-7 Typical Influence of Temperature on Sensitivity Temperature (oC) Sensitivity Change (dB) 0 10 20 30 40 50 60 -0.5 -1.0 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.
Introduction 22 Chapter 1
2 General Information This chapter contains information about recommended equipment, performance tests, and replacement parts of the Agilent Coaxial Power Sensors.
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. .
General Information Connector Care Keeping in mind its flammable nature, a solution of pure isopropyl or ethyl alcohol can be used to clean connectors. CAUTION The RF connector bead deteriorates when contacted by 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.
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 account in order to determine the pass/fail condition.
General Information Table 2-2 Frequency Power Sensor SWR and Reflection Coefficient Maximum SWR (Reflection Coefficient) 100 kHz to 600 kHz < 1.80 (0.286) 600 kHz to 2 GHz < 1.18 (0.083) System SWR Uncertainty Performance Limit (Rho System Rho Uncertainty) Actual Measurement 8485A 50 to 100 MHz < 1.15 (0.070) 0.1 to 2 GHz < 1.10 (0.048) 2 to 12.4 GHz < 1.15 (0.070) 12.4 to 18 GHz < 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.
General Information Table 2-2 Power Sensor SWR and Reflection Coefficient Frequency Maximum SWR (Reflection Coefficient) 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) System SWR Uncertainty Performance Limit (Rho System Rho Uncertainty) Actual Measurement 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 < 1.25 (0.112) 12.4 to 18 GHz < 1.30 (0.130) 8482H 100 kHz to 4.
General Information Table 2-2 Frequency Power Sensor SWR and Reflection Coefficient Maximum SWR (Reflection Coefficient) 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) System SWR Uncertainty Performance Limit (Rho System Rho Uncertainty) Actual Measurement 8487D 50 to 100 MHz < 1.19 (0.085) 0.1 to 2 GHz < 1.15 (0.069) 2 to 12.4 GHz < 1.20 (0.091) 12.4 to 18 GHz < 1.29 (0.
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.
General Information Table 2-3 Bulkhead Assembly Model Reference Designator Part Number Qty Description 8481A A1 08481-60004 1 Bulkhead Assembly, Type N 8481A Opt 001 A1 08481-60005 1 Bulkhead Assembly, Type APC-7 8482A A1 08482-60003 1 Bulkhead Assembly, Type N 8483A A1 08483-60003 1 Bulkhead Assembly, Type N 8485A A1 08485-60007 1 Bulkhead Assembly, 3.5mm 8485A Opt 033 A1 08485-60011 1 Bulkhead Assembly, 3.5mm 8487A A1 08487-60002 1 Bulkhead Assembly, 2.
General Information Table 2-4 Power Sensor Board Assemblies Model Reference Designator Part Number Qty Description 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 08481-2
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.
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 Ch
3 Service This Service chapter contains information about principles of operation, troubleshooting, and repair of the Agilent Coaxial Power Sensors.
Service Principles of Operation Thermocouple Sensors The A1 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 input power. The dc voltage is routed from the thermocouples to the input amplifier via gold wires reducing unwanted thermocouple effects.
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 varies 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 A2E1 and A2E2.
Service Figure 3-1 Schematic Diagram 38 Chapter 3
Service Troubleshooting Troubleshooting information is 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.
Service signal. Check the following levels of the square wave with an oscilloscope. • 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 A1 Bulkhead Assembly.
Service Table 3-1 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.
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.
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 is supplied with a calibration report and a new calibration sticker for the Power Sensor. Procedure Step 1.
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.
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. NOTE 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.
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.
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.
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.
Service Disassembly / Reassembly Procedures Disassembly Procedure Disassemble the Power Sensor by performing the following steps: CAUTION Disassembly 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 A1 Bulkhead Assembly must be replaced. NOTE Every Power Sensor has an individually prepared label on the housing.
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.
Service Figure 3-5 Power Sensor Hardware Locations 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.
Service Step 2. Insert cap screws 8, 9, 11, 12, 14, and 15 but do not tighten. Step 3. Center the circuit board so there is equal air gap between each side and the chassis. Tighten 8, 9, 14, and 15. Step 4. Insert screw 3, 4, and 5. Tighten only screw 5. Step 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. Step 6. Using tweezers, position the ends of the gold wires over the electrical pads.
A EPM Series Power Meter (E4418B) 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.
EPM Series Power Meter (E4418B) Modification The Material and Tools Required The following material and tools are required for this modification: • A T-15 torque screwdriver. • A 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.
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.
EPM Series Power Meter (E4418B) Modification 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.
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.
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.
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 lb/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.
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 Chop Output Step 11. Label each of the BNC 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.
B Bulkhead Assemblies This Appendix contains the material lists and exploded graphics of the Bulkhead Assemblies.
Bulkhead Assemblies Bulkhead Parts Lists Table B-1 Reference Designator Bulkhead Parts for the 8481A, 8481B, 8482B, and 8482B Models Part Description Sensor Model 8481A 8481B 8481A Opt 001 8482A 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 Adapter 5020-3
Bulkhead Assemblies Table B-2 Reference Designator Bulkhead Parts for the 8481D Model Part Description Sensor Model 8481D MP1 Connector Nut 5021-7255 MP2 Connector Component 1250-0016 MP3 Connector Body 1250-2132 MP4 Contact Assembly 1250-0917 MP5 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 504
Bulkhead Assemblies Table B-3 Reference Designator Bulkhead Parts for the 8481H and 8482H Models Part Description Sensor Model 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 5020-3
Bulkhead Assemblies Table B-3 Reference Designator Bulkhead Parts for the 8481H and 8482H Models Part Description Sensor Model 8481H 8482H MP25 Inner Conductor Spacer 5020-8540 or 08742-0005 5020-8540 or 08742-0005 MP26 Flat Washer 2190-0831 or 3050-0622 - A1 Cartridge 08481-60042 08482-60019 A2 Cartridge Assembly 08481-60011 08481-60011 Appendix B 65
Bulkhead Assemblies Table B-4 Reference Designator Bulkhead Parts for the 8483A Model Part Description Sensor Model 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
Bulkhead Assemblies Table B-5 Reference Designator Bulkhead Parts for the 8485A and 8485D Models Part Description Sensor Model 8485A 8485A Opt 033 8485D 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 MP5 Outer Conductor Spacer 00281-20046 00281-20046 MP6 Center Conductor 5040-6958 5040-6958 MP7 Center Internal Coax 5021-7093 5021-7093 MP8 Be
Bulkhead Assemblies Table B-6 Reference Designator Bulkhead Parts for the 8487A and 8487D Models Part Description Sensor Model 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
Bulkhead Assemblies Bulkhead Exploded Graphics Figure B-1 8481A and 8481B Appendix B 69
Bulkhead Assemblies Figure B-2 8481A Option 001 70 Appendix B
Bulkhead Assemblies Figure B-3 8482A and 8482B Appendix B 71
Bulkhead Assemblies Figure B-4 8481D 72 Appendix B
Bulkhead Assemblies Appendix B 8481H Only 8481H and 8482H 8481H Only Figure B-5 73
Bulkhead Assemblies Figure B-6 8483A 74 Appendix B
Bulkhead Assemblies Figure B-7 8485A, 8485A Opt 033, 8485D, and 8485D Opt 033 Appendix B 75
Bulkhead Assemblies Figure B-8 8487A and 8487D 76 Appendix B
