Agilent Technologies Stud Sensor 85037-90013 User's Manual
Contents
1. Operation 3 5 Note Note Before you zero the detector remove all RF signals from the detector input Even a small RF signal present during zeroing produces measurement errors The 8757D analyzer has three types of zeroing Autozero AUTOZRO turns off the source RF signal output and automatically zeroes the detector Repeat REPT AZ ON OFF automatically repeats autozero at Autozero selected intervals Manual Zero MANUAL is similar to power meter zeroing First you must either physically remove the detector from the RF signal or turn the RF signal off then you select MANUAL to perform the zero See the analyzer documentation for more information on these softkeys AC Detection Measurements Making Accurate AC Measurements 3 6 Operation AC detection is the preferred method for the majority of measurements as it offers greater sensitivity It also offers immunity to noise and drift with time and temperature AC detection amplitude measurements require a modulation envelope The envelope is provided through a 27 778 kHz square wave amplitude modulation of the RF test signal Test set connections vary depending on the source Figure 3 2 illustrates a typical measurement setup with an Agilent 8360 synthesized sweeper supplying the 27 778 kHz modulation Accurate AC measurements depend heavily on the envelope of the amplitude modulated RF signal In addition to obtain the specified dynamic accuracy a ch2. ing procedures and service sheets in this manual Install the replacement assembly Keep the defective assembly for return to HP Is a replacement assem bly on hand Order rebuilt exchange assembly from HP Refer to the replaceable parts section for part numbers Order rebuilt exchange assembly from HP Refer to the replaceable parts section for partnumbers Put rebuilt exchange assembly in spares stock Swap replacement assembly and defective assembly Return defective assem bly to HP Return defective assem bly to HP HP pays postage on boxes mailed in U S A Rebuilt exchange assemblies are shipped individually in boxes like this In addition to the circuit assem bly the box contains Exchange assembly failure report Return address label Qpen box carefully it will be used to return defective assembly to HP Complete failure report Place it and defective assembly in box Be sure to remove enclosed return address label Seal box with tape Inside U S A stick preprinted return address label over label already on box and return box to HP Outside U S A do not use address label instead address box to the nearest HP office Figure 6 2 Module Exchange Program By internet phone or fax get assistance with all your test amp measurement needs Table 6 3 Contacting Agilent Online Assistance United States tel 1 800 452 484
3. Power Ref should remain off Set the Cal Factor on the power meter to the value indicated for 50 MHz on the power sensor Cal Factor Chart 3 On the 8757D Preset the analyzer turn channel 2 off and select the detector mode for DC Press PRESET Press Channel 2 2 Pressing twice turns Channel 2 off Measuring the Source Measuring the Detector Press Instrument State SYSTEM Select MODE DC 4 On the source 5 9 Press w Connect the power meter sensor to the output of the splitter Press ALC Ext Det MORE Coupling Factor aB Press POWER LEVEL 10 dBm and if necessary adjust the power level for a power meter reading within 0 05 dB of 10 dBm Do not readjust the power level for the remainder of this test On the source a Press and enter the test frequencies as shown on the work sheet For example GHz Using the Cal Factor Chart on the Power Sensor Set the Cal Factor on the power meter to the value indicated for the test frequency as needed Use the nearest frequency value Note the reading on the power meter Record this value onto the worksheet Table 4 3 under the Source Power column Repeat steps 5 and 6 using at minimum the test frequencies noted on the work sheet Disconnect the power meter sensor With the detector still disconnected from the source zero the detector Press CAL on the 8757D Select
4. removing 7 2 DC detection 3 1 detector characterization 3 7 connecting 2 3 power calibration 3 7 replacing 7 2 zeroing 3 5 detector rebuild exchange 7 1 dynamic accuracy 3 3 dynamic accuracy of the 8757D 4 2 dynamic power accuracy 4 10 Index 1 Index 2 electrical performance 4 1 electrostatic discharge ESD 2 2 cautions 3 1 equipment 4 6 exchange credit 7 1 feedthrough nulling adjustment 5 1 floor mat use 2 2 frequency response 4 5 correction constants 3 3 correction factors 3 3 gaging 2 4 heel strap use 2 2 initial inspection 2 1 installation 2 1 mat use 2 2 measurement errors sources 4 2 measurements AC detection 3 6 DC detection 3 5 measurement system configuration 3 4 measuring the detector 4 7 measuring the source 4 7 mixer or multiplier when using manually entering frequencies 3 3 module exchange program 6 4 operating environment 2 6 operation theory 3 1 ordering parts 6 1 packaging 2 6 performance tests 4 1 dynamic accuracy 4 1 10 frequency response 4 1 4 5 return loss 4 3 power requirements 2 3 reflection measurements 1 2 removing covers 7 2 repairable parts 7 1 replaceable parts 6 1 replacing cable 7 3 detector 7 2 return loss 4 3 test description 4 2 safety considerations 2 1 service 7 1 returning detector for service 2 7 setup AC detection mode 3 4 6 DC detection mode 3 4 5 static safe practices 2 2 w
5. Manual this symbol when it is necessary for the user to refer to the instructions in the manual Contents General Information Introduction Product Description Instruments Covered by This Manual Accessories Equipment Required but Not Supplied Recommended Test Equipment Reflection or Transmission Measurements AC Detection Specifications and Supplemental Characteristics Installation Safety Considerations Initial Inspection Preparation for Use Electrostatic Discharge ESD Static Safe Workstation Static Safe Practices Power Requirements Cable Lead Identification Mating Connectors Connecting an 85037A B Mating a Precision 3 5 mm Connector to an SMA Connector Electrical Performance Operating Environment Storage and Shipment Environment Packaging Returning a Detector for Service Operation Operating Theory AC Detection DC Detection Features Connector Torque Values Operator s Check Operating Modes and Specifications Dynamic Accuracy Frequency Response Measurement System Configuration 1 1 1 1 1 1 1 2 1 2 1 2 1 2 1 2 1 2 2 1 2 1 2 2 2 2 2 2 2 2 2 3 2 3 2 3 2 3 2 4 2 4 2 6 2 6 2 6 2 6 2 7 3 1 3 1 3 1 3 2 3 2 3 3 3 3 3 3 3 3 3 4 Contents 1 Contents 2 DC Detection Measurements i Enabling the DC Detection Mode Making Accurate DC Measurements Operation Zeroing an 85037A B AC Detection Measurements Making Accurate AC Measureme
6. Option 002 internal calibrator The default specifications apply when the calibrator is not used Power calibrator uncertainty is included in the 85037A B corrected specifications Dynamic accuracy refers to measurement accuracy as power varies in dB from a 0 dBm reference 25 5 C 50 MHz calibration and measurement at the same temperature 5 DC mode 25 5 C calibration and measurement at the same temperature General Information 1 3 Table 1 2 Agilent 85037B Specifications Connector 3 5 mm m Frequency Range 0 01 to 26 5 GHz Return Loss 0 01 to 0 04 GHz 10 dB 0 04 to 18 GHz 20 dB 18 to 26 5 GHz 18 dB Frequency Response 0 01 to 0 04 GHz 0 35 dB 0 04 to 18 GHz 0 18 dB 18 to 26 5 GHz 0 22 dB Dynamic Range AC mode 20 to 55 dBm DC mode 20 to 50 dBm DC Absolute Power Accuracy Power Corrected Default dBm dB dB 20 0 25 0 40 10 0 11 0 40 30 0 11 0 40 40 0 40 0 80 50 0 85 1 30 AC Dynamic Power Accuracy 4 Power Corrected Default dBm dB dB 20 0 25 0 40 10 0 11 0 40 30 0 11 0 40 40 0 40 0 80 50 0 85 1 30 55 0 85 1 30 Temperature Coefficient of Linearity 0 01 dB C temp change after calibration 1 The 85037A B specifications only apply when used with the 8757D scalar network analyzer 2 10 dBm 25 5 C 3 The corrected specifications apply after a calibration via the 8757D Op
7. Setup 4 11 4 5 First Alternate Dynamic Power Accuracy Test Setup 4 11 4 6 Second Alternate Dynamic Power Accuracy Test Setup 4 12 5 1 Coarse Zero Feedthrough Nulling Adjustment 5 2 5 2 Coarse Zero Adjustment Loe eee 5 3 5 3 Feedthrough Nulling Adjustment 5 4 6 1 Detectors and Cable Marker Kit 6 2 6 2 Module Exchange Program 6 4 7 1 Removing the Detector Covers 7 2 7 2 Cable Connections 7 4 Tables 1 1 Agilent 85037A Standard 1 3 1 2 Agilent 85037B Specifications 1 4 1 3 Supplemental Characteristics 1 5 1 4 Recommended Test Equipment 1 6 4 1 Return Loss Equipment Table 4 3 4 2 Frequency Response Panipment Table 4 6 4 3 Worksheet 4 9 4 4 Additional Equipment 4 12 4 5 Test Record for 85037A a 4 13 4 6 Test Record for 85037A Option 001 4 17 4 7 Test Record for 85037B 4 21 6 1 Miscellaneous Parts 6 2 6 2 Replaceable Parts and Accessories 6 3 6 3 Contacting Agilent 6 5 Contents 4 General Information Introduction Product Description Instruments Covered by This Manual This manual contains information on operating testing and servicing the Agilent 85037A and 85037B precision detectors Figure 6 1 shows the detectors and the supplied cable marker kit The Agilent 85037A B precision detectors are specifically designed for use with an Agilent 8757D scalar network analyzer and are not compatible with the Agilent 8757A C E 8756 or 8755 scalar network analyzers These dual dio
8. Two adjustments can be performed on the 85037A B 1 coarse zero adjustment 2 feedthrough nulling adjustment Normally these two adjustments do not need to be performed They should only be performed if the zeroing routine fails Before attempting any adjustments m Turn on all equipment and allow a minimum of 30 minutes warmup time m Note that the adjustments are interactive and must be performed in the order given Adjustments 5 1 Coarse Zero Adjustment Description Procedure 5 2 Adjustments The coarse zero adjustment centers the detector s DC preamp input offset voltage within the built in automatic zero routine s range This is accomplished by adjusting for the lowest overall indication of noise on the 8757D When the level is minimized it indicates that the range has been properly centered Remove the detector s outer covers and metal housing to allow access for making the adjustments Refer to Removing the Covers at the beginning of Chapter 7 Service SCALAR NETWORK ANALYZER Figure 5 1 Coarse Zero Feedthrough Nulling Adjustment Equipment 8757D scalar network analyzer 1 Connect the equipment as shown in Figure 5 1 with no input to the detector 2 Press PRESET 3 Press SYSTEM MORE SERVICE A4 ADC MORE CHANNEL VOLTS CHANV LOGGER 4 Locate the single turn potentiometer on bottom side of the board While viewing the for ad
9. detector takes about 60 seconds Once characterized do not unplug the detector from the analyzer or you will have to perform another characterization This is because the 8757 automatically recalibrates itself when it senses a detector has been removed or connected to the detector inputs However the analyzer can be turned off and on again without losing this information Perform the characterization at least once per day and more often if the temperature varies by more than 5 C Operation 3 7 Performance Tests 4 Introduction Equipment Required Note Use the procedures in this chapter to test the detector s electrical performance to the specifications listed in Chapter 1 None of these tests require access to the detector s interior To completely test each detector three tests are required 1 return loss 2 dynamic accuracy AC and DC uncorrected 3 frequency response Preceding each test is an equipment table that lists which equipment you will need for that particular test You may substitute any equipment that meets the indicated critical specifications Refer to Table 1 4 Before you perform a performance test gage the input connector on the detector and enter the results in the test record at the end of Performance Tests For descriptive illustrations defining connector tolerances see Microwave Connector Care part number 08510 90064 Performance Tests 4 1 Return Loss ata Nomi
10. produce a 27 778 kHz square wave whose peak to peak voltage corresponds to the magnitude of the original RF signal DC mode requires no modulation The detector diode converts the RF signal into DC voltage which is then chopped at a 27 778 kHz rate and amplified The amplified signal is a signal like that produced by AC detection Electrostatic discharge ESD can damage the highly sensitive microcircuits in this device charges as low as 100 V can destroy your detector ESD damage occurs most often as you connect or disconnect a device Use this detector at a static safe workstation and wear a grounding strap Never touch the input connector center contact or the cable contact pins Do not exceed the recommended torque specification to tighten a connector because greater surface torque can deform the mating surfaces Do not apply more than 23 dBm RF CW power or more than 10 Vdc to the detector Higher power voltage can electrically damage the detector Before you connect a cable to the detector always discharge the cable s center conductor static electricity to instrument ground Do not subject the detector to mechanical shock Operation 3 1 Features Q 1 RF INPUT CONNECTOR This connector accepts RF input signal The RF input connector varies with the detector selected 2 DC CONNECTOR This connector supplies the necessary DC voltage for operation of the HP 85037A B and feeds the detec
11. 3 5 mm and SMA connectors 1 Inspect the SMA connector Never mate a precision 3 5 mm connector to an SMA connector in which the solid plastic dielectric protrudes in front of the outer conductor mating plane 2 Gage both connectors The SMA connector must meet the precision 3 5 mm connector setback specifications If not it will damage the 3 5 mm connector In some SMA connectors the male contact pins are not held securely and are easily pulled out of specification especially if the female connector contact fingers are tight Also some SMA male pins are not true pins but are the cut off ends of the center conductor in semi rigid coaxial cable In this case misalignment and burrs are likely to occur 3 Carefully align the connectors 4 Push the two connectors together with the male contact pin precisely concentric with the female 5 Do not twist either connector or device 6 Turn only the outer male connector nut 7 Use a 60 N cm 5 in lb torque wrench for the final connection If you must make more than a few connections use a 3 5 mm to 3 5 mm adapter to protect the 3 5 mm connector Electrical Performance The electrical performance of the junction of two precision 3 5 mm connectors is superior to the junction of either two SMA connectors or an SMA connector mated to a precision 3 5 mm connector See Figure 2 3 When you mate an SMA connector with a precision 3 5 mm connector the connection has a typical mis
12. 4 Canada tel 1 877 894 4414 fax 905 206 4120 Europe tel 31 20 547 2323 fax 31 20 547 2390 Japan tel 81 426 56 7832 fax 81 426 56 7840 Latin America tel 305 269 7500 fax 305 269 7599 Australia tel 1 800 629 485 fax 61 3 9210 5947 New Zealand tel 0 800 738 378 fax 64 4 495 8950 Asia Pacific tel 852 3197 7777 fax 852 2506 9284 Replaceable Parts 6 5 Service 7 Caution This product is susceptible to damage from electrostatic discharge ESD When you perform any of the following procedures wear a grounded static strap and work at a static safe workstation Error Messages The message F Et Indicates that the EEPROM calibration constants are either corrupted or unable to be read from the detector The problem could be in either the detector or the 8757D Try another detector to isolate the cause If the detector appears to be the cause of the problem then the detector needs to have the calibration constants regenerated at the factory Refer to Returning a Detector for Service in Chapter 2 Installation Repair Remember These detectors have only one repairable item m The cable assembly If the detector fails electrically order an exchange detector 1 See the Replaceable parts Table 6 2 for the part number that matches the model that you are replacing 85037A 85037A Option 001 or 85037B 2 Follow The
13. Module Exchange Program instructions in Figure 6 2 To receive exchange credit you must return the failed assembly to Agilent in the exchange assembly box Service 7 1 Repair Replacing the Detector 1 Removing the Covers 1 7 2 Service Remove the plastic covers from the existing detector See Removing the Covers Install the covers on the replacement detector Perform an operator s check See Operator s Check in Chapter 3 If the replacement is a restored exchange detector return the defective detector using the packing material supplied Place the detector with its narrow side on a flat surface with the RF connector facing away from you See Figure 7 1 Holding the sides of the detector near the cable end insert a small flat blade screwdriver with a blade no greater than 3 5 mm 1 8 in between the side label and the raised edge See Figure 7 1 Make sure you insert the screwdriver as far forward on the detector as possible Rotate the screwdriver approximately 90 until the cover snaps apart Repeat steps 2 and 3 inserting the screwdriver approximately 2 3 of the way toward the cable end of the detector See the point shown in Figure 7 1 Separate the plastic shell halves If the cover does not separate easily repeat steps 2 through 4 on the other side of the detector See Figure 7 1 To attach the covers to a replacement detector snap
14. OC DET ZERO Select AUTOZERO When the zero is complete the display will indicate Performance Tests 4 7 Computing the Maximum Error 4 8 Performance Tests 10 11 12 13 Connect the detector to the power splitter On the 8757D Press Function to turn the cursor on On the source Press and enter the first test frequency Remember to use only the test frequencies used in steps 5 through 7 Note and record on the worksheet under the Measured Power column the value indicated by the 8757D cursor display Repeat this step until all of the same frequency points have been measured Using the values recorded in steps 6 and 12 subtract the value in step 6 from the value in step 12 for each of the frequencies as shown on the worksheet Now use these values to plot a point to point variation curve on the graph on the next page The peak to peak variations determine the frequency response of the detector Record this result on the test record This completes the procedure for measuring frequency response FREQUENCY RESPONSE 5 4 3 2 1 0 1 2 3 4 5 01 O4 2 6 10 14 18 22 26 Frequency in GHz Figure 4 3 Frequency Response Graph Table 4 3 Worksheet Recommended Test Frequencies Frequency Measured Power Source Power Meas Power minus in GHz dB
15. Operating and Service Manual Agilent Technologies 85037A B Precision Detectors Serial Numbers This manual applies directly to Agilent 85037A B detectors with serial number 00101 and above oh Agilent Technologies Part Number 85037 90013 Printed in USA November 2001 Supersedes J une 1993 Copyright 1992 1993 2001 Agilent Technologies Inc 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 shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performatnce or use of this material Hewlett Packard to Agilent Technologies Transition This documentation supports a product that previously shipped under the Hewlett Packard company brand name The brand name has now been changed to Agilent Technologies The two products are functionally identical only our name has changed The document still includes references to Hewlett Packard products some of which have been transitioned to Agilent Technologies Certification Warranty Agilent Technologies certifies that this product met its published specifications at the time of shipment from the factory Agilent further certifies that its calibration measurements are tra
16. Option 001 Directional Bridge 85027A Calibrated Open Short Part Number 85021 60001 Adapter Type N m to 3 5 mm f Part Number 1250 1744 Additional Equipment Required for 85037B Directional Bridge 85027B Calibrated Open Short Part Number 85037 60001 Procedure 1 Connect the equipment as shown in Figure 4 1 with nothing connected to the bridge test port On the 8757D Press PRESET Press Channel 2 2 Pressing twice turns channel 2 off Allow 30 minutes for warmup 2 Reset the stop frequency on the source and if necessary and set the power For the 85037A On the 83620A source Press STOP Ge C Press POWER LEVEL 3 dBm For the 85037B It is not necessary to reset the stop frequency on the Agilent 83630A source as it stops automatically at 26 5 GHz 3 Calibrate the test setup Press Function CAL Select SHORT OPEN Follow the directions prompts appearing on the CRT Connect the short to the test port of the bridge Select STORE SHORT Remove the short Performance Tests 4 3 Note 4 4 Performance Tests Connect the open to the test port of the bridge Select STORE OPEN Remove the open The CRT will display Press Function DISPLAY Select MEAS MEM 4 On the 8757D Connect the detector under test to the test port of the bridge Press Function SCALE 5 4B Press CURSOR Use the cursor to find the highest trace value the worst case measurement
17. PER NETWORK ANALYZER EXT ALC RF OUT A POWER SPLITTER N CRYSTAL 10 dB DETECTOR ATTENUATOR we62ab Figure 4 2 Frequency Response Test Setup Performance Tests 4 5 Table 4 2 Frequency Response Equipment Table Equipment Common to All Agilent Detectors Scalar Network Analyzer 8757D 8360 Series Synthesized Sweeper 83620A 30A Power Meter 436A 437B 438A Additional Equipment Required for Agilent 85037A Power Splitter 11667A Power Meter 436A 437B 438A Calibrated Sensor 8481A 10 dB Attenuator 8491B Option 010 Crystal Detector 8474B Additional Equipment Required for Agilent 85037A Option 001 Power Splitter Power Meter Calibrated Sensor 10 dB Attenuator 11667A Opt 002 436A 437B 438A 8481A Option 001 8492A Option 010 Crystal Detector 8474A Additional Equipment Required for Agilent 85037B Power Splitter 11667B Power Meter 436A 437B 438A Calibrated Sensor 8485A 10 dB Attenuator 8493C Option 010 Crystal Detector 8473D Procedure Configuring the System 4 6 Performance Tests 1 Connect the equipment as shown in Figure 4 2 with nothing connected to the open end of the power splitter Turn on all equipment Allow 30 minutes for warmup 2 On the power meter Press dBm mode Zero and calibrate the power meter If you are unsure of how to do this refer to the power meter operating and service manual Range Hold and
18. T Figure 4 5 First Alternate Dynamic Power Accuracy Test Setup This setup is for performing independent verification of dynamic accuracy in 10 dB increments up to 0 dBm in DC mode Performance Tests 4 11 Second Alternate Dynamic Power Accuracy Description Procedure 4 12 Performance Tests PULSE FUNCTION SCALAR NETWORK ANALYZER GENERATOR DETECTOR SOMH UNDER BANDPASS FILTER TEST GDB ATTENUATOR 10DB STEP ATTENUATOR Figure 4 6 Second Alternate Dynamic Power Accuracy Test Setup This setup is for performing independent verification of dynamic accuracy in 10 dB increments up to 20 dBm in DC mode Table 4 4 Additional Equipment Function Generator 50 MHz Bandpass Filter Agilent 8116A 08757 80027 1 Set the 8757D for CW DC mode cursor on 2 Set the step attenuator to 20 dB 3 Adjust the 8116 for a 50 MHz sinewave and adjust the amplitude for a cursor reading of 0 0 dBm 4 Adjust the step attenuator in 10 dB steps and compare the 8757D cursor reading with the calculated applied power determined by the calibrated step attenuator The 20 dB step on the step attenuator becomes the reference The other steps are relative to this 20 dB value 5 The detector should be rezeroed between the 30 and 40 dBm steps Table 4 5 Test Record for 85037A Test Facility Report Number Model Seria
19. aracterization of the detector a power cal must first be performed Without this characterization only the default dynamic accuracy is guaranteed Performing the characterization will calibrate the detector in both AC and DC modes See Characterizing the Detector in this chapter The RF signal must be squarewave modulated at a rate within 20 Hz of 27 778 kHz The amplitude ratio of the on portion to the off portion of the envelope must be at least 30 dB and the ratio of on time to off time should be within 5 of 50 50 Most Agilent sources provide this capability If your 8757D scalar network analyzer is equipped with the Option 002 power calibrator you can obtain the best power measurement accuracy by following this procedure Characterizing the Detector Performing a Power Calibration To obtain the best accuracy and to meet the corrected dynamic accuracy specifications each detector must be characterized on the 8757D input on which it will be used The characterization routine simultaneously corrects both AC and DC measurements This routine is also useful as an operator s check to ensure the detector is operating properly Only the 8757D with an Option 002 power calibrator have this capability Detector characterization begins at 20 dBm and decreases in 1 dB increments down to 35 dBm To reduce measurement time power steps are larger than 1 dB at lower power levels Correction values will be generated over
20. ceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members This Agilent instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Agilent will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by Agilent Buyer shall prepay shipping charges to Agilent and Agilent shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Agilent from another country Agilent Technologies warrants that its software and firmware designated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument Agilent does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparati
21. characterized using the built in correction routine in the 8757D Once this is done the detector will meet the enhanced corrected specification for dynamic accuracy for both AC and DC measurements This characterization will remain valid until the detector is unplugged For optimal performance however the detector must be recharacterized if its temperature changes by more than 5 C The 85037 uses built in correction factors to provide the best possible frequency response The number of correction factors will vary with each detector but is typically 25 These correction factors are determined at the factory and are stored within the EEPROM of the detector If the 8757D is used with the system interface then the analyzer will automatically determine the proper correction factor to use no user intervention is required If the 8757 system interface is not being used then the frequency related correction factors will be determined from the start stop labels These labels can be entered into the 8757 by pressing SYsTEM LABELS START LABEL or STOP LABEL and then entering the start or stop frequency Operation 3 3 Measurement System Configuration 3 4 Operation However if the frequency the detector sees is different from what is being swept for example when using a mixer or multiplier then the user must manually enter the correct detector frequencies as follows Press CAL 1 2 3 Select Sel
22. coupler AC detection requires the equipment listed above plus either a signal source capable of 27 778 kHz squarewave amplitude modulation or an external modulator Specifications and Supplemental Characteristics 1 2 General Information Table 1 1 and Table 1 2 list detector specifications which are the performance standards or limits against which you can test the device Table 1 3 lists supplemental typical non warranted detector characteristics Table 1 1 Agilent 85037A Standard Connector Standard Type N m Option 001 Precision 7 mm Frequency Range 0 01 to 18 GHz Return Loss 0 01 to 0 04 GHz 10 dB 0 04 to 18 GHz 20 dB Frequency Response 0 01 to 0 04 GHz 0 35 dB 0 04 to 18 GHz 0 18 dB Dynamic Range AC mode 20 to 55 dBm DC mode 20 to 50 dBm DC Absolute Power Accuracy Power Corrected Default dBm dB dB 20 0 25 0 40 10 0 11 0 40 30 0 11 0 40 40 0 40 0 80 50 0 85 1 30 AC Dynamic Power Accuracy 4 Power Corrected Default dBm dB dB 20 0 25 0 40 10 0 11 0 40 30 0 11 0 40 40 0 40 0 80 50 0 85 1 30 55 0 85 1 30 Temperature Coefficient of Linearity 0 01 dB C temp change after calibration 1 The 85037A B specifications only apply when used with the 8757D scalar network analyzer 2 10 dBm 25 5 C 3 The corrected specifications apply after a calibration via the 8757D
23. de detectors may be used in either AC or DC detection modes For improved power measurement accuracy versus frequency each Agilent 85037 series precision detector includes detector specific frequency response data stored in an internal EEPROM which is automatically read by the 8757D When used in conjunction with the 8757D s internal power calibrator Option 002 these detectors provide the maximum absolute power measurement accuracy Agilent Detector Connector Type 85037A Type N m 85037A Option 001 Precision 7 mm 85037B Precision 3 5 mm m Each detector has a unique serial number The contents of this manual apply directly to detectors with serial numbers listed on the title page General Information 1 1 Accessories Table 6 2 lists accessories available for use with these detectors Equipment Required but Not Supplied Recommended Test Equipment Reflection or Transmission Measurements AC Detection Table 1 4 lists the equipment required to test the detectors You may substitute any equipment that meets the indicated critical specifications Reflection and transmission measurements require the following equipment m One or more detectors m An Agilent 8757D scalar network analyzer m One of the following o A directional bridge a A directional coupler a A sweep oscillator or synthesized sweeper For ratio measurements use a A power splitter or dual directional
24. display indicates MANUAL ZERO COMPLETED Locate the Feedthrough Null multi turn potentiometer which is on the top side of the PC board the same side as the cable wires Adjust it one half turn either direction See Figure 5 3 Repeat steps 9 through 12 until turning the Feedthrough Null potentiometer in either direction will only decrease the displayed noise If the overall noise level is less lower on the screen than the beginning value noted reverse the direction of adjustment Continue adjusting until the noise level displayed is maximized MULTI TURN POTENTIOMETER FOR FEED THRU NULLING ADJUSTMENT TOP SIDE Figure 5 3 Feedthrough Nulling Adjustment Replaceable Parts Introduction This section provides replaceable parts and ordering information Ordering Parts To order a part listed in the replaceable parts Table 6 2 quote the Agilent part number indicate the quantity required and address the order to your nearest Agilent office Replaceable Parts 6 1 To request information on a part that is not listed in the replaceable parts table include the instrument model number and a description of the part and its function Address the inquiry to the nearest Agilent office 85037A DETECTOR 01 18GHz HEWLETT SER XXXXX PACKARD MADE IN USA Replace the microcircuit board assembly with rebuilt exchange assembly not shown Comes with fully assembled detector input co
25. ect Select Select Select Select MORE DET FREQ DET A B C or R Start Freq and use the keypad to enter a value Stop Freq and use the keypad to enter a value DET FREQ ON Figure 3 2 shows a typical measurement setup AC detection mode the turn on state of the 8757D analyzer does not require any special setup to initiate a measurement DC detection mode however requires that you press specific analyzer keys in the correct order SWEEP OUT IN SWEEP IN HP 8757 SYSTEM INTERFACE g RF SCALAR gt a PLUG IN NETWORK ANALYZER DETECTOR DEVICE UNDER TEST DETECTOR T DIRECTIONAL BRIDGE Figure 3 2 Typical Measurement Setup DC Detection Measurements Enabling the DC Detection Mode Remember Making Accurate DC Measurements DC detection offers absolute power measurement capability and the ability to characterize oscillators and modulation sensitive devices 1 On the analyzer press PRESET 2 Connect the detector 3 Enable DC mode Press SYSTEM and select MODE DC Selecting the MODE DC softkey also turns off the source square wave modulation m You must enable the DC mode to access the DC specific softkeys a To make DC mode measurements as shown in Figure 3 2 you must use an 85027 directional bridge capable of both AC and DC detection Operation Before accurate DC meas
26. el Serial Number Options Date Customer Tested by Ambient temperature C Relative humidity Special Notes Performance Tests 4 21 Table 4 7 Test Record for 85037B 2 of 3 Model Report Number Date Test Equipment Used Model Number Trace Number Cal Due Date 1 2 4 22 Performance Tests Table 4 7 Test Record for 85037B 3 of 3 Serial Number Report Number Date Test Measured Measurement Description Specification Results Uncertainty Return Loss at a Nominal 10 dBm 0 01 to 0 04 GHz 10 dB 0 7 dB 0 04 to 18 GHz 20 dB 1 4 dB 18 GHz to 26 5 GHz 18 dB 2 0 dB Frequency Response at a Nominal 10 dBm 0 01 to 0 04 GHz 0 35 dB 0 18 dB 0 04 to 18 GHz 0 18 dB 0 25 dB 18 GHz to 26 5 GHz 0 22 dB 0 3 dB Dynamic Power Accuracy AC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 3 dB 50 dBm 1 3 dB 0 36 dB Noise Floor gt 55 dBm Dynamic Power Accuracy DC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 0 dBm 0 4 dB 0 22 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 3 dB 50 dBm 1 3 dB 0 36 dB 1 Using the equipment and procedures documented in this manual Performance Tests 4 23 Adjustments Introduction
27. er Options Date Customer Tested by Ambient temperature C Relative humidity Special Notes Performance Tests 4 17 Table 4 6 Test Record for 85037A Option 001 2 of 3 Model Report Number Date Test Equipment Used Model Number Trace Number Cal Due Date 1 2 4 18 Performance Tests Table 4 6 Test Record for 85037A Option 001 3 of 3 Serial Number Report Number Date Test Measured Measurement Description Specification Results Uncertainty Return Loss at a Nominal 10 dBm 0 01 to 0 04 GHz 10 dB 7 dB 0 04 to 18 GHz 20 dB 1 4 dB Frequency Response at a Nominal 10 dBm 0 01 to 0 04 GHz 0 35 dB 0 18 dB 0 04 to 18 GHz 0 18 dB 0 25 dB Dynamic Power Accuracy AC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 3 dB 50 dBm 1 3 dB 0 36 dB Noise Floor gt 55 dBm Dynamic Power Accuracy DC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 3 dB 50 dBm 1 3 dB 0 36 dB 1 Using the equipment and procedures documented in this manual Performance Tests 4 19 4 20 Performance Tests Table 4 7 Test Record for 85037B Test Facility Report Number Mod
28. he container Use a 5 to 7 cm 3 to 4 inch layer of shock absorbing material around all sides of the detector Seal the shipping container securely Mark the shipping container FRAGILE Returning a Detector for Service If you ship the detector to a Agilent office or service center fill out a blue service tag provided at the back of this manual and include the following information 1 o e WwW N Company name and address Do not use an address with a P O box number because products cannot be returned to a P O box A technical contact person with a complete phone number The complete model and serial number of the detector The type of service required calibration repair Any other information such as failure condition or cause that could expedite service When you make an inquiry either by mail or by telephone refer to the detector by both model number and full serial number Installation 2 7 Operation 3 Operating Theory AC Detection DC Detection Cautions The 85037A B can detect either unmodulated RF signals DC mode or square wave amplitude modulated RF signals AC mode In either detection mode the detector provides a 27 778 kHz square wave signal to the analyzer to interpret and display In AC detection an RF or microwave signal is amplitude modulated with a 27 778 kHz square wave The detector demodulates envelope detects and amplifies this signal to
29. heck the alcohol periodically for contamination Caring for Connectors A 1 Mechanical Inspection A 2 Caring for Connectors Because coaxial connector mechanical tolerances can be very precise on the order of a few hundredths of microinches even a perfectly clean unused connector can cause trouble if it is mechanically out of specification Use a connector gage to mechanically inspect coaxial connectors Gage a connector at the following times m Before you use it for the first time a If either visual inspection or electrical performance indicates that the connector interface may be out of specification due to wear or damage for example m The device is used on another system or piece of equipment m As a matter of routine initially after every 100 connections and after that as often as experience suggests Index AC detection 1 2 3 1 adjustments 5 1 coarse zero adjustment 5 1 2 feedthrough nulling adjustment 5 1 2 autozero 4 7 bridge directivity 4 2 source match 4 2 cable lead identification 2 3 replacing 7 3 cable assembly 7 3 characterizing the detector 3 7 characterizing the source 4 7 cleaning connectors A 1 coarse zero adjustment 5 1 computing the maximum error 4 8 worksheet 4 9 connector care A 1 cleaning A 1 mating 2 3 mating a 3 5 mm to an SMA connector 2 4 mechanical inspection A 2 torque values 3 2 visual inspection A 1 contacting Agilent 6 5 cover attaching 7 2
30. in each specification range Write each value in the test record If more frequency resolution is needed at the low end of the frequency range repeat the preceeding procedure using a stop frequency of 50 MHz This completes the procedure for measuring return loss Frequency Response at a Nominal 10 dBm Description The frequency response of the 85037A B detector is specified as the maximum peak to peak deviation from a constant input signal of 10 dBm as measured over the specified frequency range To simplify the measurement procedure frequency response is measured with a nominal 10 dBm signal applied First the source is characterized for frequency response using a calibrated power meter sensor combination Second the DUT is characterized Finally a point by point difference is computed plotted and compared to the specification window The manual test described in this procedure has an approximate root sum of the squares RSS uncertainty ranging up to 0 25 dB This implies that a good detector well within the limits of its specifications could measure out of specification This measurement is only an indication of the detector s response within these limits If greater measurement accuracy is desired a test system that minimizes the sources of measurement uncertainty will be required 8757 SYSTEM INTERFACE POS Z BLANK SWP OUT IN SWP_IN STOP SWEEP SYNTHESIZED SCALER SWEE
31. just the coarse zero potentiometer the single turn pot for the most negative reading typically about 5 V See Figure 5 2 SINGLE TURN POTENTIOMETER FOR COARSE ZERO ADJUSTMENT R27 BOTTOM SIDE Figure 5 2 Coarse Zero Adjustment Feedthrough Nulling Adjustment Description Procedure The feedthrough nulling is adjusted for best DC accuracy below 45 dBm This is accomplished by adjusting for the highest overall indication of noise on the 8757D When the level of noise is maximized it indicates that the feedthrough is nulled Equipment 8757D scalar network analyzer Perform the following steps in order Connect the equipment as shown in Figure 5 1 On the 8757D 1 Press PRESET 2 Press Channel 2 2 Pressing twice turns Channel 2 off 3 Press SYSTEM MORE SWEEP MODE CW ON to place the 8757D in CW mode 4 Press SYSTEM MODE DC 5 Press SMOOTH ON 6 Press SCALE 5 4B 7 If necessary use the arrows keys to move up or down to set the reference line to the center of the screen This will be 4 divisions up from the bottom of the CRT screen 8 Press REF REF POSN 9 Press CURSOR CRSR gt REF LVL Adjustments 5 3 5 4 Adjustments 10 11 12 13 Press DC DET ZERO MANUAL The display indicates If you have connected the detector to an RF output disconnect it Press CONT When the routine is complete the
32. king a connection to a static sensitive device or test port ground yourself as far as possible from the test port m Discharge static electricity from a device before connecting it Touch the device briefly through a resistor of at least 2 MQ to either the outer shell of the test port or another exposed ground This discharges static electricity and protects test equipment circuitry Power Requirements Cable Lead Identification Mating Connectors Caution Connecting an The scalar network analyzer supplies power for the detector When you use more than one detector use the coded cable clips from the cable marker kit to identify leads place matching clips on each cable one at each end Table 1 3 lists connector mechanical tolerances Microwave Connector Care 08510 90064 provides information on the proper maintenance inspection and gaging of connectors Use the appropriate torque wrench See Table 1 4 When tightening a connector do not apply more than the recommended torque value If you torque the connectors with more pressure than is recommended it can deform the mating surfaces Connect a detector to the network analyzer as follows 85037A B 1 With the cable plug key downward insert the DC connector into the analyzer mating connector 2 To secure the DC connector in the analyzer turn the outer shell clockwise 3 For a standard detector connect the RF input by turning the male connector ou
33. l Number Options Date Customer Tested by Ambient temperature C Relative humidity Special Notes Performance Tests 4 13 Table 4 5 Test Record for 85037A 2 of 3 Model Report Number Date Test Equipment Used Model Number Trace Number Cal Due Date 1 2 4 14 Performance Tests Table 4 5 Test Record for 85037A 3 of 3 Serial Number Report Number Date Test Measured Measurement Description Specification Results Uncertainty Return Loss at a Nominal 10 dBm 0 01 to 0 04 GHz 10 dB 1 0 dB 0 04 to 18 GHz 20 dB 2 4 dB Frequency Response at a Nominal 10 dBm 0 01 to 0 04 GHz 0 35 dB 0 18 dB 0 04 to 18 GHz 0 18 dB 0 25 dB Dynamic Power Accuracy AC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 30 dB 50 dBm 1 3 dB 0 36 dB Noise Floor gt 55 dBm Dynamic Power Accuracy DC Mode uncorrected 19 dBm 0 4 dB 0 2 dB 10 dBm 0 4 dB 0 13 dB 30 dBm 0 4 dB 0 22 dB 40 dBm 0 8 dB 0 3 dB 50 dBm 1 3 dB 0 36 dB 1 Using the equipment and procedures documented in this manual Performance Tests 4 15 4 16 Performance Tests Table 4 6 Test Record for 85037A Option 001 Test Facility Report Number Model Serial Numb
34. m dBm Source Power dB 0 01 0 04 0 10 2 6 10 14 16 18 20 22 24 26 5 Performance Tests 4 9 Dynamic Power Accuracy Description Procedure 4 10 Performance Tests The dynamic power accuracy of the 85037A B is dependent upon the raw uncorrected response of the detector the correction routine of the 8757D analyzer and the accuracy of the 8757D Option 002 calibrator The accuracy of the calibrator is assumed to be within specifications This can be checked by following the performance test procedure in the 8757D manual The correction routine is fixed and cannot vary so it is also assumed to be accurate The high accuracy of the 85037A B is only guaranteed after performing the built in characterization routine a power cal in the 8757D Once this is done performing any dynamic accuracy tests using the same 8757D calibrator is ineffectual because the only error that will be seen will be due to measurement repeatability and any possible temperature drift Therefore to verify the dynamic accuracy of the 85037A B only the raw uncorrected performance is measured Once this has been verified the corrected dynamic accuracy by design must be within specification Independent verification of both corrected and uncorrected specifications can be performed by using either of the two alternative setups shown in Figure 4 5 or Figure 4 6 Testing of the raw dynamic accuracy performance is the only test req
35. match SWR of 1 10 at 2 GHz This mismatch is less than that of two SMA connectors but is much higher than that of two precision 3 5 mm connectors 3 5 mm CONNECTOR ZZ AIR DIELECTRIC Kant INTERIOR SUPPORT BEAD SMA CONNECTOR PLASTIC DIELECTRIC SUPPORT SMA SMA INTERFACES SMA PRECISION 3 5 mm INTERFACES PRECISION 3 5 mm PRECISION 3 5 mm INTERFACES FREQUENCY IN GHz Figure 2 3 SMA and 3 5 mm Connector Cross Sections and SWR Performance Installation 2 5 Operating Environment Storage and Shipment 2 6 Environment Installation Packaging Temperature 0 C to 55 C Humidity Up to 95 Protect the detector from temperature extremes which can cause condensation Altitude Up to 7 620m 25 000 ft Store or ship the detectors in environments within the following limits Temperature 25 C to 75 C Humidity Up to 95 Protect the detector from temperature extremes which can cause condensation Altitude Up to 7 620m 25 000 ft Containers and materials identical to those used in factory packaging are available Contact your local Agilent office for information If you package the detector using commercially available material follow these instructions 1 2 Wrap the detector in heavy paper Use a strong shipping container that has a double wall carton of at least 350 pound test material Provide a firm cushion that prevents movement inside t
36. nal 10 dBm Description 4 2 Performance Tests The return loss of the 85037 can be measured using the test system described in this procedure The test setup is calibrated using an open short to minimize frequency response and phasing errors Then the detector under test DUT is connected to the test port of the bridge and its return loss is measured on the 8757D The three main sources of error in these measurements come from 1 bridge directivity 2 source match of the bridge 3 dynamic accuracy of the 8757D The first two vary with frequency while dynamic accuracy varies with the measured return loss amplitude Use the corresponding connector compatible Agilent directional bridge Agilent 85027 A B or C 8757 SYSTEM INTERFACE POS Z BLANK SWP_OUT IN SYNTHESIZED SCALER SWEEPER NETHORK ANALYZER RF OUT ADAPTER amene AS REQUIRED g a Pu DETECTOR UNDER HP 85027 i DIRECTIONAL BRIDGE Figure 4 1 Return Loss Setup Table 4 1 Return Loss Equipment Table Equipment Common to all Agilent Detectors Scalar Network Analyzer 8757D 8360 Series Synthesized Sweeper 83620A 30A Additional Equipment Required for 85037A Directional Bridge 85027C Shielded Open Part Number 85032 60001 Short Agilent 11512A Adapter Type N m to 3 5 mm f Part Number 1250 1744 Additional Equipment Required for 85037A
37. nnector and cable CEJ HEWLETT e PACKARD Figure 6 1 Detectors and Cable Marker Kit Table 6 1 Miscellaneous Parts Item Agilent Description and Quantity Part Number 1 Plastic half body cover 2 85025 40006 2 Label warning max input 1 85037 80003 Label electrostatic sensitive 1 85037 80002 3 Cable assembly 1 85025 60003 4 Screw M2 5 x 0 45 4 mm LG 2 0515 0972 5 Lock washer 2 5 mm 2 2190 0583 6 Cable marker kit 1 5061 1044 6 2 Replaceable Parts Table 6 2 Replaceable Parts and Accessories Part Description Agilent Model or Part Number Rebuilt Exchange Assemblies 85037A Type N 85037 69006 85037A Option 001 7mm 85037 69007 85037B 3 5 mm 85037 69008 Accessories Connector Gage Kits Type N 85054 80011 7mm 85050 80012 3 5 mm 11752 60106 Collet Extractor Tool For 85037A Option 001 Adapters Extension Cables Connector Care Manual Type N f to BNC m 3 5 mm f to 3 5 mm f Type N m to APC 7 Option 001 only APC 3 5 f to N m 7 6 meter 25 foot 61 meter 200 foot Type N m to Type N m 5060 0370 1250 1534 1250 1475 1250 1749 11525A 1250 1744 11679A 11679B 08510 90064 Replaceable Parts 6 3 6 4 Replaceable Parts Use this fast efficient economical method to keep your Hewlett Packard instrument in service Locate defective assem bly using troubleshoot
38. nts Characterizing the Detector Performing a Power Calibration Performance Tests Introduction Equipment Required Return Loss at a Nominal 10 dBm Description Procedure Frequency Response at a Nominal 10 dBm Description Procedure Configuring the System Measuring the Source Measuring the Detector Computing the Maximum Error Dynamic Power Accuracy Description Procedure First Alternate Dynamic Power Accuracy Description Second Alternate Dynamic Power Accuracy Description Procedure Adjustments Introduction Coarse Zero Adjustment Description Procedure Feedthrough Nulling Adjustment Description Procedure Replaceable Parts Introduction Ordering Parts 3 5 3 5 3 5 3 5 3 5 3 6 3 6 3 7 4 1 5 1 5 2 5 2 5 2 5 3 5 3 5 3 6 1 6 1 T Service Error Messages Repair Replacing the Detector Removing the Covers Replacing the Cable Assembly W1 Caring for Connectors Visual Inspection Cleaning Mechanical Inspection Index 7 1 7 2 7 2 7 3 A 1 A 1 A 2 Contents 3 Figures 2 1 Example of a Static Safe Workstation 2 2 2 2 Using Precision 7 mm Connectors 2 3 2 3 SMA and 3 5 mm Connector Cross Sections and SWR Performance 2 5 3 1 Detector Features 3 2 3 2 Typical Measurement Setup 3 4 4 1 Return Loss Setup 4 2 4 2 Frequency Response Test Setup 4 5 4 3 Frequency Response Graph 4 9 4 4 Dynamic Power Accuracy Test
39. on or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HEWLETT PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HEWLETT PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent products For any assistance contact your nearest Agilent Technologies Sales and Service Office Safety Notes Caution Warning The following safety notes are used throughout this manual Familiarize yourself with each of the notes and its meaning before operating this instrument Caution denotes a hazard It calls attention to a procedure that if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met Warning denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning note until the indicated conditions are fully understood and met Instruction The instruction manual symbol The product is marked with
40. orkstation 2 2 storage and shipment 2 6 environment 2 6 table mat use 2 2 test records 4 13 transmission measurements 1 2 WI1 cable replacement 7 3 wrist strap use 2 2 zeroing 3 6 autozero 3 6 manual zero 3 6 repeat zero 3 6 Index 3
41. ppendix provides a brief introduction to the fundamentals of proper connector care as important to good measurements as proper instrument calibration and adjustment This appendix is intended to provide basic information and tell you where to find more Agilent s Microwave Connector Care See Table 6 2 for ordering information A damaged connector can destroy any connector attached to it Basic connector care comprises three parts 1 visual inspection 2 cleaning 3 mechanical inspection Visually inspect all system connectors often Examine connectors for problems such as contamination or corrosion especially on the contacting surfaces Look for deformed threads burrs scratches rounded shoulders and similar signs of wear or damage Any visible problem can degrade performance clean reinspect and if necessary replace the connector a Try compressed air first Use compressed air to loosen particles on the connector mating plane surfaces Clean air cannot damage a connector or leave particles or residues behind a Ifa solvent is necessary use only isopropyl alcohol If there is dirt or contamination on a connector that you cannot removed with compressed air try a foam swab or lint free cleaning cloth moistened with isopropyl alcohol m Use the least amount of alcohol possible m Avoid getting any plastic parts in the connectors wet with the alcohol m Never spray alcohol directly into a connector m C
42. r test to specifications See Chapter 3 Operation or Chapter 4 Performance Tests If any of the following conditions exist notify your nearest Agilent office m incomplete shipment m mechanical damage or defect m failed electrical test If you find damage or signs of stress to the shipping container or the cushioning material keep them for the carrier s inspection Agilent does not wait for a claim settlement before arranging for repair or replacement Installation 2 1 Preparation for Use Caution Electrostatic Discharge 2 2 Installation ESD Do not subject the detector to mechanical shock ESD can damage the highly sensitive microcircuits in this device charges as low as 100 V can destroy a detector ESD damage occurs most often as you connect or disconnect a device Use this detector at a static safe workstation and wear a grounding strap Never touch the input connector center contacts or the cable contact pins Static Safe Workstation Figure 2 1 illustrates a static safe station using two types of ESD protection that you can use either together or separately m A conductive table mat and wrist strap combination m A conductive floor mat and heel strap combination Building Ground 1 MegOhm Resistor Wrist Strap Figure 2 1 Example of a Static Safe Workstation Static Safe Practices m Before cleaning inspecting or ma
43. rectional Bridge Power Meter Calibrated Power Sensor 10 dB Attenuator Calibrated Short Shielded Open Calibrated Short Shielded Open Adapter Torque Wrench Required for 85037A No substitute Required for 85037A Option 001 No substitute Required for 85037B No substitute Required for 85037A Option 001 No substitute Compatible with 8757D No substitute Compatible with 8757D AC DC detection Type N Precision 7 mm Precision 3 5 mm Type N Precision 7 mm Precision 3 5 mm Type N Type N Precision 3 5 mm Precision 7 mm Type N f to BNC m Type N m to Type N m 3 5 mm f to 3 5 mm f Type N m to APC 7 Option 001 only Precision 7 mm 12 in lb 85037A Option 001 20 mm 8 in lb 85037B 85054 80011 85050 80012 11752 60105 5060 0370 83620A 30A 8757D 85027A B C 436A 437B or 438A 8481A 8481A Option 001 8485A 8491B Option 010 8492A Option 010 8493C Option 010 11511A 85032 60001 85037 60001 85021 60001 1250 1534 1250 1475 1250 1749 11525A 8710 1766 8710 1764 1 6 General Information Installation Safety There are no hazardous voltages in this detector Considerations Initial Inspection 1 Check the shipping container and packaging material for damage 2 Check that the shipment is complete 3 Check connector cable and detector body for mechanical damage 4 Check the detector electrically Either make a measurement o
44. ter shell clockwise 4 For a precision Option 001 7 mm connector refer to Figure 2 2 To Connect To Disconnect 1 On one connector retract the coupling sleeve by 1 Loosen the coupling nut of the connector turning the coupling nut counterclookwise until the showing the wider gold band sleeve and nut disengage 2 On the other connector fully extend the coupling prevent striking the inner conductor contact sleeve by turning the coupling nut clockwise To engage coupling sleeve and coupling nut whe the sleeve is fully retracted press back lightly on the LOOSEN THIS WIDER nut while turning it clockwise COUPLING NUT GOLD BAND TO DISCONNECT J 3 Push the connectors firmly together and thread F the coupling nut of the connector with retracted sleeve over the extended sleeve 4 Do NOT tighten the other coupling nut since this will tend to loosen the electrical connection 2 IMPORTANT Part the connectors carefully to Figure 2 2 Using Precision 7 mm Connectors Installation 2 3 2 4 Installation Mating a Precision 3 5 mm Connector to an SMA Connector It is possible to mate a precision 3 5 mm connector to an SMA connector but this is not ideal because the two connectors have slightly different dimensions and mechanical characteristics Mating a precision 3 5 mm connector to an SMA connector also affects the electrical performance See Electrical Performance Use the following procedure to safely mate
45. the halves together Paint in Step 4 Figure 7 1 Removing the Detector Covers Replacing the Cable L Assembly W1 Repair Remove the plastic covers from the detector See Removing the Covers Remove the two screws at the cable end of the metal housing Slide the metal housing away from the RF connector completely exposing the printed circuit PC assembly Unsolder all cable wires from the PC assembly With the PC assembly facing up carefully secure the detector frame in a vice Do not grip the PC assembly Caution Do not over tighten the vice you can bend the frame co ON DD 10 11 12 13 14 Using a 7 16 inch open ended wrench unscrew the cable hex nut Remove the old cable assembly Remove the metal housing from the cable Carefully slide the metal housing onto the new cable assembly making sure that you do not cover the adjustment potentiometers Solder the new cable wires to the PC assembly Refer to Figure 7 2 Ensure that all cable wires are securely connected to the assembly Slide the metal housing over the PC assembly Using the screws removed in step 2 secure the metal housing to the frame Snap the covers back on Service 7 3 Repair 7 4 Service RED BLUE 15 12 YELLOW GREEN WHITE vc Figure 7 2 Cable Connections A Caring for Connectors Remember Visual Inspection Cleaning This a
46. this range if the detector is operational It will also correct for any loss in the detector up to about 50 dB For example lets assume a DC detector has a dynamic range of 20 to 50 dBm A 30 dB attenuator is then placed on the detector and a characterization is performed Upon completion the detector will be characterized from 20 to 20 dBm Applying a 0 dBm signal to the detector pad combination will result in a 0 dBm reading not a 30 dBm reading which is what the detector itself is actually seeing A loss of more than about 50 dB may result in an error message being displayed on the analyzer This could occur if the detector is defective or if you simply forgot to connect the detector under test to the Power Cal Output of the 8757D Upon completion of this routine the dynamic range of the detector will be displayed verify that it is correct for the current detection mode taking into account any attenuation due to added pads or other devices or due to inherent loss such as in a directional bridge which typically has 12 5 dB of loss To characterize the detector perform a power cal connect the detector to the desired input of the 8757D Connect the RF input of the detector to the calibrator output Make sure the analyzer has been on and the detector connected for at least 30 minutes 1 Press CAL 2 Select MORE 3 Select POWER CAL 4 Select DET A B C or R 5 Select START CAL A complete characterization for one
47. tion 002 internal calibrator The default specifications apply when the calibrator is not used Power calibrator uncertainty is included in the 85037A B corrected specifications Dynamic accuracy refers to measurement accuracy as power varies in dB from a 0 dBm reference 25 5 C 50 MHz calibration and measurement at the same temperature 5 DC mode 25 5 C calibration and measurement at the same temperature 1 4 General Information Table 1 3 Supplemental Characteristics Cable Length 1 22m 48 in Weight Net 0 24 kg 0 5 Ib Shipping 1 kg 2 2 lb RF Connector Mechanical Tolerances Type N male 85037A Recession of the male center conductor 0 207 to 0 210 in Precision 7 mm 85037A Option 001 Recession of the center conductor 0 to 0 003 in Collet resilience After you depress the collet it must spring back out Precision 3 5 mm 85037B Recession of the male center conductor 0 to 0 003 in 1 Because a type N gage calibration block zeros the gage at a 0 207 inch offset the gage displays a 0 207 to 0 210 inch offset as 0 000 to 0 003 inches 2 With the center conductor collet removed General Information 1 5 Table 1 4 Recommended Test Equipment Item Critical Specifications Agilent Model or Part Number Type N Connector Gage Kit 7 mm Connector Gage Kit 3 5 mm Connector Gage Kit Collet Extractor Tool Synthesized Sweeper Scalar Network Analyzer Di
48. tor output signal to the network analyzer Figure 3 1 Detector Features Connector Torque a Tighten the 85037A type N connector finger tight only Values m Tighten the 85037A Option 001 with a torque wrench part number 8710 1766 set at 13 8 cm kg 12 in lb m Tighten the 85037B with a torque wrench part number 8710 1764 set at 9 2 cm kg 8 in lb 3 2 Operation Operator s Check See Characterizing the Detector in this chapter for a procedure that allows you to quickly check the detector This procedure can be used as a daily check Operating Modes and Specifications Dynamic Accuracy Frequency Response The Agilent 85037 series precision detectors have built in corrections for both frequency range and dynamic accuracy These corrections are used to enhance the measurement capability of the detector The following text explains how the corrections are made Additional information regarding detector operation is available in the 8757D Scalar Network Analyzer Operating Manual The dynamic accuracy and absolute power accuracy of the detector is measured at the factory Approximately 150 correction constants are then calculated and stored in the EEPROM of each detector This provides a default correction and is sufficient to guarantee the default dynamic accuracy specifications To obtain maximum performance the detector must be connected to the 50 MHz calibrator output of the 8757D Option 002 and then
49. uired The manual test procedure follows 1 Connect the equipment as shown in Figure 4 4 If the sweeper is on turn it off Allow equipment to warm up for 30 minutes Disconnect the detector Press PRESET Reconnect the detector to input A this forces default correction Press Channel 2 2 Pressing twice turns Channel 2 off Press SYSTEM Select MORE SWEEP MODE CW ON CoN DMD oO e W N 9 Press MORE DET OFFSET MEASURE DET OFS DET A 0 dBm START MEAS Read the offset value Note this number as the reference value 10 Press PRIOR MENU 49 dBm START MEAS 11 Read the offset value shown on the 8757D and subtract from this the reference value in step 9 Record the results on the test record card under Dynamic Accuracy AC Mode 12 Repeat steps 10 and 11 at the power levels shown on the test record First Alternate Dynamic Power Accuracy Description 13 Verify the noise floor in AC mode Press avc AVG ON and record the average noise floor as displayed by the cursor reading 14 Press PRESET SYSTEM MODE DC 15 Repeat steps 6 through 12 for DC mode The detector should be rezeroed between the 30 and 40 dBm steps SCALAR NETWORK ANALYZER OOOO0000 Figure 4 4 Dynamic Power Accuracy Test Setup SCALAR NETWORK ANALYZER POWER METER TT DETECTOR UNDER rm TES
50. urements can be made two quick routines must be performed a DC zero and a dynamic power characterization This is referred to as a power calibration on the 8757 and on other annotations The DC zero will improve accuracy below 35 dBm The dynamic characterization will provide the improved corrected power accuracy specification on the 8787D Option 002 only Measurements can be performed without this characterization such as on instruments without Option 002 however only the default dynamic accuracy specifications of the detector are guaranteed This characterization includes a DC zero so it is not necessary to perform the zero before performing the characterization Zeroing an 85037A B When making DC mode measurements you must perform a zeroing operation to compensate for the effects of DC drift and temperature fluctuations This is not required in AC detection The zeroing operation eliminates small DC voltages present in the detector that would otherwise cause amplitude measurement errors at low power levels 35 dBm and below Zeroing also establishes the displayed noise level the system noise floor with no RF signal applied A DC zero should be performed at least once every half hour once the system has stabilized A DC zero should be performed more often as the system warms up or if the temperature is changing The autozero function is provided to automatically perform DC zeros periodically when the system interface is used
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