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Service Guide
Agilent Technologies
8752C
Network Analyzer
Manufacturing Part Number: 08752-90136
Printed in USA
Print Date: February 1998
Supersedes: December 1997
© Agilent Technologies, Inc. 1998
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Hewlett-Packard to Agilent Technologies Transition This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. To reduce potential confusion, the only change to product numbers and names has been in the company name prefix: where a product number/name was HP XXXX the current name/number is now Agilent XXXX. For example, model number H
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Printing Copies of Documentation from the Web To print copies of documentation from the Web, download the PDF file from the Agilent web site: Go to http://www.agilent.com. Enter the document’s part number (located on the title page) in the Quick Search box. Click GO. Click on the hyperlink for the document. Click the printer icon located in the tool bar.
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Contacting Agilent This information supersedes all prior HP contact information. Online assistance: www.agilent.com/find/assist Americas Brazil Canada Mexico United States (tel) 1 800 254 2440 (tel) (+55) 11 3351 7012 (tel) +1 877 894 4414 (tel) 800 829 4444 (fax) 1 800 254 4222 (fax) (+55) 11 3351 7024 (fax) +1 303 662 3369 (alt) (+1) 303 662 3998 (fax) 800 829 4433 Asia Pacific and Japan Australia China Hong Kong India (tel) 1 800 225 574 (tel) 800 810 0508 (tel) 800 933 229 (tel) 1600 112 626
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Service Guide HP 8752C Network Analyzer ABCDE HP P art No . 08752-90136 Supersedes December 1997 Printed in US A F ebruary 1998
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Notice. The information contained in this document is subject to change without notice . Hewlett-P ackard makes no warranty of any kind with regard to this material, including but not limited to , the implied warranties of merchantability and tness for a particular purpose . Hewlett-P ackard 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. c Copyright 1995, 1997, 1998 Hewlett-P
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Contents 1. Service Equipment and Analyzer Options T able of Service T est Equipment .. .. .. .. .. .. .. .. 1-1 Principles of Microwave Connector Care .. .. .. .. .. .. 1-5 Analyzer Options A vailable . . . . . . . . . . . . . . . . . . . 1-7 Option 003, 3 GHz Operation . . . . . . . . . . . . . . . . . 1-7 Option 004, Step Attenuator .. .. .. .. .. .. .. .. . 1-7 Option 006, 6 GHz Operation . . . . . . . . . . . . . . . . . 1-7 Option 010, Time Domain .. .. .. .. .. .. .. .. .. 1-7 Option 075,
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HP 8752C Type-N T est P ort Characteristics (75 System) .. .. 2-7 Directivity .. .. .. .. .. .. .. .. .. .. .. .. 2-7 Source Match (Re ection) .. .. .. .. .. .. .. .. . 2-7 Source Match (Transmission)* .. .. .. .. .. .. .. . 2-8 Re ection Tracking .. .. .. .. .. .. .. .. .. .. 2-8 Load Match .. .. .. .. .. .. .. .. .. ... .. . 2-8 Transmission Tracking .. .. .. .. .. .. .. .. .. . 2-8 System V eri cation Procedure .. .. .. .. .. .. .. . . . 2-9 In case of di culty .. .. .. .. .. .. .. .. .. ..
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P ower Level Linearity for an HP 8752C with Options 003 and 004 .. .. .. .. .. .. .. .. .. .. .. .. .. 2-22 P ower Level Linearity for an HP 8752C with Options 004 and 006 .. .. .. .. .. .. .. .. .. .. .. .. .. 2-23 P ower Level Linearity for an HP 8752C with Options 003, 004, and 075 .. .. .. .. .. .. .. .. .. .. . . . . 2-23 In case of di culty .. .. .. .. ... .. .. .. .. . 2-23 4. Transmission T est P ort Input Noise Floor Level (HP 8752C without Option 075) .. .. .. .. .. .. .. .. .. .. 2-24
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T est P ort Crosstalk for an HP 8752C with Option 006 . . . . . 2-33 T est P ort Crosstalk for an HP 8752C with Option 075 . . . . . 2-34 T est P ort Crosstalk for an HP 8752C with Options 003 and 075 2-34 In case of di culty .. .. .. .. .. .. .. .. .. .. 2-35 7. System Trace Noise . . . . . . . . . . . . . . . . . . . . . 2-36 Speci cations .. .. .. .. .. .. ... .. .. .. .. . 2-36 Equipment .. .. .. .. .. .. .. .. .. .. .. .. . 2-36 Description . . . . . . . . . . . ... .. .. .. .. .. . 2-36 Pr
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A9 CC (Correction Constant) Jumper P osition .. .. .. .. . 3-5 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 2. Source Default Correction Constants (T est #44) .. .. .. .. 3-8 Equipment .. .. .. .. .. .. .. .. .. .. .. .. . 3-8 W arm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-8 Description and Procedure . . . . . . . . . . . . . . . . . . 3-8 3. Source Pretune Default Correction Constants (T est #45) . . . . 3-9 Equipment .. .. .. .. .. .. .. .. .. .. .. .. . 3-9
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W arm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-22 Description and Procedure . . . . . . . . . . . . . . . . . . 3-22 11. Cavity Oscillator Frequency Correction Constants (T est #54) . 3-24 Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-24 W arm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-24 Description and Procedure . . . . . . . . . . . . . . . . . . 3-24 Spur Search Procedure with Filter . . . . . ... .. .. .. 3-26 Spur Search Procedure without Filter
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W arm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-46 Description and Procedure . . . . . . . . . . . . . . . . . . 3-46 20. Frequency A ccuracy A djustment .. .. .. .. .. .. .. 3-49 Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-49 W arm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-49 Description and Procedure . . . . . . . . . . . . . . . . . . 3-50 21. High/Low Band Transition A djustment .. .. .. ... .. 3-51 Equipment Required . . . . . . . . . . . . . .
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Source Check .. .. .. ... .. .. .. .. .. .. .. . 4-13 Receiver Check .. .. .. .. .. .. .. .. .. ... .. 4-15 A ccessories Check . . . . . . . . . . . . . . . . . . . . . . 4-15 5. P ower Supply Troubleshooting Assembly Replacement Sequence . . . . . . . . . . . . . . . . 5-2 Simpli ed Block Diagram . . . . . . . . . . . . . . . . . . . . 5-3 Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 Check the Green LED and Red LED on A15 . . . . . . . . . . 5-4 Check the Green LEDs on A
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P erform Display Intensity and F ocus A djustments .. .. .. . 6-7 A1/A2 Front P anel Troubleshooting . . . . . . . . . . . . . . . 6-7 Check Front P anel LEDs After Preset . . . . . . . . . . . . . 6-7 Identify the Stuck Key . . . . . . . . . . . . . . . . . . . . 6-8 Inspect Cables . . . . . . . . . . . . . . . . . . . . . . . . 6-10 T est Using a Controller . . . . . . . . . . . . . . . . . . . . 6-11 Run the Internal Diagnostic T ests . . . . . . . . . . . . . . . . 6-11 A19 GSP and A18 Displ
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2ND LO W aveforms .. .. .. .. .. .. .. .. .. .. 7-21 90 Degree Phase O set of 2nd LO Signals in High Band .. 7-21 In-Phase 2nd LO Signals in Low Band . . . . . . . . . . . 7-22 A12 Digital Control Signals Check . . . . . . . . . . . . . . 7-23 L ENREF Line . . . . . . . . . . . . . . . . . . . . . . 7-23 L HB and L LB Lines . . . . . . . . . . . . . . . . . . . 7-24 A13/A14 Fractional-N Check .. .. .. .. .. .. .. .. . 7-24 Fractional-N Check with Analog Bus . . . . . ... .. .. 7-24 A14 V CO Rang
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Check 2nd LO Signal at Sampler/Mixer .. ... .. .. .. . 8-13 Check Input Trace . . . . . . . . . . . . . . . . . . . . . . 8-14 9. A ccessories Troubleshooting Assembly Replacement Sequence . . . . . . . . . . . . . . . . 9-2 Inspect the A ccessories . . . . . . . . . . . . . . . . . . . . . 9-3 Inspect the T est P ort Connectors and Calibration Devices . . . . 9-3 Inspect the Error T erms .. .. .. .. .. .. .. .. .. .. 9-3 Cable T est .. .. .. .. .. .. .. .. .. .. ... .. . 9-5 V erify Shorts and
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HP-IB Service Mnemonic De nitions .. .. .. .. .. .. .. 10-52 Invoking T ests Remotely . ... .. .. .. .. .. .. .. . 10-52 Analog Bus Codes .. .. .. .. .. .. .. .. .. .. . . 10-53 Error Messages .. .. .. .. .. .. .. .. .. .. .. .. 10-54 11. Error T erms Error T erms Can Also Serve a Diagnostic Purpose .. .. .. .. 11-2 Re ection 1-P ort Error-Correction Procedure .. .. .. .. .. 11-4 Response and Isolation Calibration Procedures . . . . . . . . . . 11-6 Error T erm Inspection .. .. .. .. .. .. .. ..
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12. Theory of Operation How the HP 8752C W orks .. .. .. .. .. .. .. .. .. . 12-2 The Built-In Synthesized Source .. .. .. .. .. .. .. . 12-3 The Source Step Attenuator (Option 004) .. .. .. .. .. 12-3 The Built-In Transmission/Re ection T est Set .. ... .. .. 12-4 The Receiver Block .. .. .. .. .. .. .. .. .. .. . 12-4 The Microprocessor .. .. .. .. .. .. .. .. .. .. 12-4 A Close Look at the Analyzer’s Functional Groups . . . . . . . . 12-5 P ower Supply Theory .. .. .. .. .. .. .. .. .. .. . 1
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Receiver Theory . . . . . . . . . . . . . . . . . . . . . . . . 12-23 A4/A5/A6 Sampler/Mixer . . . . . . . . . . . . . . . . . . . 12-28 The Sampler Circuit in High Band . . . . . . . . . . . . . . 12-28 The Sampler Circuit in Low Band . . . . . . . . . . . . . . 12-28 The 2nd LO Signal . . . . . . . . . . . . . . . . . . . . . 12-28 The Mixer Circuit .. .. ... .. .. .. .. .. .. .. 12-29 A10 Digital IF . . . . . . . . . . . . . . . . . . . . . . . . 12-29 13. Replaceable P arts Assembly Replacem
