Agilent Technologies 8752C User manual

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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11/16/04

Service Guide
HP 8752C Network Analyzer
ABCDE
HP Part No. 08752-90136 Supersedes December 1997
Printed in USA February 1998

Notice.
The information contained in this document is subject to change without notice.
Hewlett-Packard 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-Packard 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-Packard Company

Contents
1. Service Equipment and Analyzer Options
Table of Service Test Equipment ................ 1-1
Principles of Microwave Connector Care ............ 1-5
Analyzer Options Available . . . . . . . . . . . . . . . . . . . 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, 75 Impedance . . . . . . . . . . . . . . . . . . 1-7
Option 1CM, Rack Mount Flange Kit Without Handles .... . 1-7
Option 1CP, Rack Mount Flange Kit With Handles ....... 1-8
Option AFN, add 50 Test Port Cable ............. 1-8
Option AFP, add 75 Test Port Cable .. .. .. .. .. .. . 1-8
Option B02, External Disk Drive .... .. .. .. .. .. . 1-8
Service and Support Options .................. 1-9
2. System Verication and Performance Tests
How to Test the Performance of Your Analyzer .... .. .. . 2-1
Sections in this Chapter .................... 2-2
HP 8752C System Verication . . . . . . . . . . . . . . . . . . 2-3
Equipment ......................... 2-3
Description .... .. .. .. .. .. .. .. .. .. .. . 2-3
System Verication Cycle and Kit Recertication . . . . . . . . 2-4
Measurement Uncertainty ...... .. .. .. .. .. .. 2-4
Measurement Uncertainty Window .............. 2-4
HP 8752C Type-N Test Port Characteristics (50 System) .... 2-6
Directivity ........................ 2-6
Source Match (Reection) ...... .. .. .. .. .. . 2-6
Source Match (Transmission)* ............... 2-6
Reection Tracking .................... 2-6
Load Match ........................ 2-7
Transmission Tracking . . . . . . . . . . . . . . . . . . . 2-7
Contents-1

HP 8752C Type-N Test Port 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 Verication Procedure .. .. .. .. .. .. .. . .. 2-9
In case of diculty ..................... 2-10
HP 8752C Performance Tests . . . . . . . . . . . . . . . . . . 2-11
Equipment Required to Run the Performance Tests ...... 2-12
1. Reection Test Port Output Frequency Range and Accuracy .. 2-13
Specications ........................ 2-13
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-13
Description ......................... 2-13
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
In case of diculty ..................... 2-14
2. Reection Test Port Output Power Range and Level Linearity
(For HP 8752C Analyzers without Option 004) ........ 2-15
Specications ........................ 2-15
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-15
Description ......................... 2-15
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Power Range and Level Linearity for an HP 8752C or an HP
8752C Option 075 ................... 2-16
Power Range and Level Linearity for an HP 8752C with Option
003 .......................... 2-17
Power Range and Level Linearity for an HP 8752C with Options
003 and 075 .. .. .. .. .. .. .. .. .. .. .. 2-18
Power Range and Level Linearity for an HP 8752C with Option
006 .......................... 2-18
In case of diculty ...... .. .. .. .. .. .. .. 2-18
3. Reection Test Port Output Power Range and Level Linearity (HP
8752C with Option 004) . . . . . . . . . . . . . . . . . . . 2-19
Specications ........................ 2-19
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-19
Description ......................... 2-19
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Power Range for an HP 8752C with Option 004 ....... 2-20
Power Level Linearity for an HP 8752C with Option 004
or an HP 8752C withOptions 004 and 075 ........ 2-21
Contents-2

Power Level Linearity for an HP 8752C with Options 003 and
004 .... .. .. .. .. .. .. .. .. .. .. .. 2-22
Power Level Linearity for an HP 8752C with Options 004 and
006 .... .. .. .. .. .. .. .. .. .. .. .. 2-23
Power Level Linearity for an HP 8752C with Options 003, 004,
and 075 .. .. .. .. .. .. .. .. .. .. . .. . 2-23
In case of diculty .................... 2-23
4. Transmission Test Port Input Noise Floor Level (HP 8752C
without Option 075) .. .. .. .. .. .. .. .. .. .. 2-24
Specications ........................ 2-24
Equipment ......................... 2-24
Description .... .. .. .. .. .. .. .. .. .. .. . 2-24
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Noise Floor Level at 300 kHz to 1.3 GHz (Standard Option), 300
kHz to 3 GHz (Option 003), or 300 kHz to 6 GHz (Option
006) with an IF BW of 3 kHz .. .. .. .. .. . .. . 2-24
Noise Floor Level at 300 kHz to 1.3 GHz (Standard Option) or
300 kHz to 3 GHz (Option 003) with an IF BW of 10 Hz . . 2-26
Noise Floor Level at 3 GHz to 6 GHz (Option 006) with an IF
BWof10Hz .... .. .. .. .. .. .. .. .. .. 2-27
Noise Floor Level at 3 GHz to 6 GHz (Option 006) with IF BW of
3 kHz ......................... 2-28
In case of diculty .................... 2-28
5. Transmission Test Port Input Noise Floor Level
(HP 8752C with Option 075) . . . . . . . . . . . . . . . . . 2-29
Specications ........................ 2-29
Equipment ......................... 2-29
Description .... .. .. .. .. .. .. .. .. .. .. . 2-29
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Noise Floor Level at 300 kHz to 1.3 GHz (Option 075) or 300
kHz to3 GHz (Options 075 and 003) with an IF BW of 3 kHz 2-29
Noise Floor Level at 300 kHz to 1.3 GHz (Option 075) or 300
kHz to3 GHz (Options 075 and 003) with an IF BW of 10 Hz 2-31
In case of diculty .................... 2-31
6. Test Port Crosstalk .. .. .. .. .. .. .. .. .. .. . 2-32
Specications ........................ 2-32
Equipment ......................... 2-32
Description .... .. .. .. .. .. .. .. .. .. .. . 2-32
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
Test Port Crosstalk for a Standard HP 8752C or an HP 8752C
with Option 003 .................... 2-33
Contents-3

Test Port Crosstalk for an HP 8752C with Option 006 . . . . . 2-33
Test Port Crosstalk for an HP 8752C with Option 075 . . . . . 2-34
Test Port 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
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Reection Trace Noise (Magnitude) ............. 2-37
Reection Trace Noise (Phase) .... .. .. .. .. .. . 2-38
Transmission Trace Noise (Magnitude) . . . . . . . . . . . . 2-38
Transmission Trace Noise (Phase) . . . . . . . . . . . . . . 2-39
In case of diculty ...... .. .. .. .. .. .. .. 2-39
8. Magnitude Dynamic Accuracy (HP 8752C - All Options) .... 2-40
Specications ........................ 2-40
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-40
Description ......................... 2-41
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
In case of diculty ...... .. .. .. .. .. .. .. 2-44
9. Phase Dynamic Accuracy (HP 8752C - All Options) ...... 2-45
Specications ........................ 2-45
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-45
Description ......................... 2-45
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
10. Compression . . . . . . . . . . . . . . . . . . . . . . . . 2-47
Specications ........................ 2-47
Equipment .... .. .. .. .. .. .. .. .. .. .. . 2-47
Description ......................... 2-47
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48
In case of diculty ...... .. .. .. .. .. .. .. 2-49
Performance Test Record . . . . . . . . . . . . . . . . . . . . 2-50
3. Adjustments and Correction Constants
When to Perform the Adjustment Procedures .......... 3-1
Keep Correction Constants Current to Save Time .... .. . 3-1
Adjustment Procedure Error Messages .... .. .. .. .. 3-1
Perform Adjustments in This Order .. .. .. .. .. .. .. . 3-2
Test Equipment Specications ................ 3-3
Analyzer Cover Removal . . . . . . . . . . . . . . . . . . . 3-4
1. A9 CC Jumper Position Procedure .............. 3-5
Contents-4

A9 CC (Correction Constant) Jumper Position .. .. .. .. . 3-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
2. Source Default Correction Constants (Test #44) ........ 3-8
Equipment ......................... 3-8
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-8
Description and Procedure . . . . . . . . . . . . . . . . . . 3-8
3. Source Pretune Default Correction Constants (Test #45) . . . . 3-9
Equipment ......................... 3-9
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-9
Description and Procedure . . . . . . . . . . . . . . . . . . 3-9
4. Analog Bus Correction Constants (Test #46) . . . . . . . . . . 3-10
Equipment ......................... 3-10
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-10
Description and Procedure . . . . . . . . . . . . . . . . . . 3-10
5. RF Output Power Correction Constants (Test #47) . . . . . . . 3-11
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-11
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-11
Description and Procedure . . . . . . . . . . . . . . . . . . 3-11
Power Sensor Calibration Factor Entry .. .. .. .. .. .. 3-12
Source Correction Routine ...... .. .. .. .. .. .. 3-13
6. Source Pretune Correction Constants (Test #48) . . . . . . . . 3-14
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-14
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-14
Description and Procedure . . . . . . . . . . . . . . . . . . 3-14
7. Display Intensity Adjustments (Test #49) ........... 3-15
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-15
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-15
Description and Procedure . . . . . . . . . . . . . . . . . . 3-15
Background Adjustment ................... 3-15
Maximum Intensity Adjustment . . . . . . . . . . . . . . . . 3-16
Operating Default Intensity Adjustment . . . . . . . . . . . . 3-18
8. IF Amplier Correction Constants (Test #51) ......... 3-19
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-19
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-19
Description and Procedure . . . . . . . . . . . . . . . . . . 3-19
9. ADC Oset Correction Constants (Test #52) . . . . . . . . . . 3-21
Equipment ......................... 3-21
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-21
Description and Procedure . . . . . . . . . . . . . . . . . . 3-21
10. Frequency Response Correction Constants (Tests #53 and #57) 3-22
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-22
Contents-5

Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-22
Description and Procedure . . . . . . . . . . . . . . . . . . 3-22
11. Cavity Oscillator Frequency Correction Constants (Test #54) . 3-24
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-24
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-24
Description and Procedure . . . . . . . . . . . . . . . . . . 3-24
Spur Search Procedure with Filter .............. 3-26
Spur Search Procedure without Filter . . . . . . . . . . . . . 3-28
12. Serial Number Correction Constant (Test #55) ........ 3-32
Equipment .... .. .. .. .. .. .. .. .. .. .. . 3-32
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-32
Description and Procedure . . . . . . . . . . . . . . . . . . 3-32
13. Option Numbers Correction Constant (Test #56) .. .. .. . 3-34
Equipment .... .. .. .. .. .. .. .. .. .. .. . 3-34
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-34
Description and Procedure . . . . . . . . . . . . . . . . . . 3-35
Option 004 Installation . . . . . . . . . . . . . . . . . . . 3-36
14. Initialize EEPROMs (Test #58) . . . . . . . . . . . . . . . . 3-37
15. EEPROM Backup Disk Procedure . . . . . . . . . . . . . . 3-38
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-38
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-38
Description and Procedure . . . . . . . . . . . . . . . . . . 3-38
How to Make an EEPROM Backup Disk and Store CCs and Data
toIt.... .. .. .. .. .. .. .. .. .. .. .. . 3-39
How to Recall CC Data from the EEPROM Disk into the Analyzer 3-40
16. Model Number Correction Constant (Option 075 Only) .. .. 3-42
Equipment .... .. .. .. .. .. .. .. .. .. .. . 3-42
Warmup time ....................... 3-42
Description and Procedure . . . . . . . . . . . . . . . . . . 3-42
17. Vertical Position and Focus Adjustments . . . . . . . . . . . 3-43
Equipment .... .. .. .. .. .. .. .. .. .. .. . 3-43
Warmup time ....................... 3-43
Description and Procedure . . . . . . . . . . . . . . . . . . 3-43
Vertical Position Adjustment ................. 3-43
Focus Adjustment ...................... 3-44
18. Display Degaussing (Demagnetizing) . . . . . . . . . . . . . 3-45
Equipment .... .. .. .. .. .. .. .. .. .. .. . 3-45
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-45
Description and Procedure . . . . . . . . . . . . . . . . . . 3-45
19. Fractional-N Frequency Range Adjustment .. .. .. .. . 3-46
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-46
Contents-6

Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-46
Description and Procedure . . . . . . . . . . . . . . . . . . 3-46
20. Frequency Accuracy Adjustment .. .. .. .. .. .. .. 3-49
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-49
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-49
Description and Procedure . . . . . . . . . . . . . . . . . . 3-50
21. High/Low Band Transition Adjustment ........... 3-51
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-51
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-51
Description and Procedure . . . . . . . . . . . . . . . . . . 3-51
22. Fractional-N Spur Avoidance and FM Sideband Adjustment . . 3-54
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-54
Warmup time .... .. .. .. .. .. .. .. .. .. . 3-54
Description and Procedure . . . . . . . . . . . . . . . . . 3-54
23. Source Spur Avoidance Tracking Adjustment ........ 3-58
Equipment Required . . . . . . . . . . . . . . . . . . . . . 3-58
Warm-up time . . . . . . . . . . . . . . . . . . . . . . . 3-58
Description and Procedure . . . . . . . . . . . . . . . . . . 3-58
4. Start Troubleshooting Here
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 4-2
Having Your Analyzer Serviced . . . . . . . . . . . . . . . . . 4-2
Step 1. Initial Observations . . . . . . . . . . . . . . . . . . . 4-3
Initiate the Analyzer Self-Test ................ 4-3
If the Self-Test Failed .. .. .. .. .. .. .. .. .. . 4-3
Step 2. Condence Test .................... 4-4
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Cable Condence Test .. .. .. .. .. .. .. .. .. .. 4-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Step 3. HP-IB Systems Check . . . . . . . . . . . . . . . . . . 4-7
If Using a Plotter or Printer ................. 4-8
If Using an External Disk Drive . . . . . . . . . . . . . . . . 4-8
Troubleshooting Systems with Multiple Peripherals . . . . . . . 4-9
Troubleshooting Systems with Controllers . . . . . . . . . . . 4-9
Step 4. Faulty Group Isolation ................. 4-10
Power Supply Check . . . . . . . . . . . . . . . . . . . . . 4-11
Check the Rear Panel LEDs . . . . . . . . . . . . . . . . . 4-11
Check the A8 Post Regulator LEDs ............. 4-11
Digital Control Check .. .. .. .. .. .. .. .. .. .. 4-12
Observe the Power Up Sequence .............. 4-12
Verify Internal Tests Passed . . . . . . . . . . . . . . . . . 4-13
Contents-7

Source Check ........................ 4-13
Receiver Check ....................... 4-15
Accessories Check . . . . . . . . . . . . . . . . . . . . . . 4-15
5. Power 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 A8 . . . . . . . . . . . . . . . . . 5-5
Measure the Post Regulator Voltages ............. 5-5
If the Green LED on A15 is not On Steadily . . . . . . . . . . . 5-7
Check the Line Voltage, Selector Switch, and Fuse . . . . . . . 5-7
If the Red LED On A15 is On . . . . . . . . . . . . . . . . . . 5-8
Check the A8 Post Regulator . . . . . . . . . . . . . . . . . 5-8
Verify the A15 Preregulator .. .. .. .. .. .. .. .. . 5-9
Check for a Faulty Assembly . . . . . . . . . . . . . . . . . 5-11
Check the Operating Temperature .............. 5-13
Inspect the Motherboard . . . . . . . . . . . . . . . . . . . 5-13
If the Green LEDs On A8 are not All On .. .. .. .. .. .. 5-14
Remove A8, Maintain A15W1 Cable Connection . . . . . . . . 5-14
Check the A8 Fuses and Voltages . . . . . . . . . . . . . . . 5-14
Remove the Assemblies .... .. .. .. .. .. .. .. . 5-15
Briey Disable the Shutdown Circuitry .... .. .. .. .. 5-16
Inspect the Motherboard . . . . . . . . . . . . . . . . . . . 5-18
Error Messages ........................ 5-19
Check the Fuses and Isolate A8 . . . . . . . . . . . . . . . . 5-21
Fan Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 5-22
Fan Speeds ......................... 5-22
Check the Fan Voltages . . . . . . . . . . . . . . . . . . . . 5-22
Short A8TP3 to Ground ................... 5-22
Intermittent Problems .... .. .. .. .. .. .. .. .. . 5-23
6. Digital Control Troubleshooting
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 6-2
Digital Control Group Block Diagram .............. 6-3
Check A9 CPU Operation . . . . . . . . . . . . . . . . . . . . 6-4
A9 CC Jumper Positions ................... 6-4
Checking A9 CPU Red LED Patterns .. .. .. .. .. .. . 6-5
Check A19 GSP and A18 Display Operation ........... 6-7
Cycle Power and Look at the Display ............. 6-7
Contents-8

Perform Display Intensity and Focus Adjustments .. .. .. . 6-7
A1/A2 Front Panel Troubleshooting . . . . . . . . . . . . . . . 6-7
Check Front Panel LEDs After Preset . . . . . . . . . . . . . 6-7
Identify the Stuck Key . . . . . . . . . . . . . . . . . . . . 6-8
Inspect Cables . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Test Using a Controller . . . . . . . . . . . . . . . . . . . . 6-11
Run the Internal Diagnostic Tests . . . . . . . . . . . . . . . . 6-11
A19 GSP and A18 Display Troubleshooting ........... 6-13
Measure Display Power Supply Voltages on A19 .. .. .. .. 6-13
Measure Display Power Supply Voltages Entering A19 .... . 6-14
Run Display Test 59 ..................... 6-15
Inspect Ribbon Cable Repeat Display Test59.......... 6-15
Perform Walking One Pattern . . . . . . . . . . . . . . . . . 6-16
Run display Tests 60-65 .... .. .. .. .. .. .. .. . 6-17
If the Fault is Intermittent .. .. .. .. .. .. .. .. .. . 6-18
Repeat Test Function . . . . . . . . . . . . . . . . . . . . . 6-18
HP-IB Failures . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
7. Source Troubleshooting
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 7-2
Before You Start Troubleshooting . . . . . . . . . . . . . . . . 7-2
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
1. Source Default Correction Constants (Test44)........ 7-3
2. RF Output Power Correction Constants (Test 47) ...... 7-3
3. Sampler Magnitude and Phase Correction Constants (Test 53) 7-3
Phase Lock Error ....................... 7-4
Phase Lock Loop Error Message Check ............ 7-4
A4 Sampler/Mixer Check . . . . . . . . . . . . . . . . . . . 7-6
A3 Source and A11 Phase Lock Check ............ 7-8
YO Coil Drive Check with Analog Bus . . . . . . . . . . . . 7-11
YO Coil Drive Check with Oscilloscope .... .. .. .. . 7-12
A12 Reference Check .................... 7-13
Analog Bus Method .................... 7-13
Oscilloscope Method . . . . . . . . . . . . . . . . . . . . 7-15
100 kHz Pulses ...................... 7-16
PLREF Waveforms . . . . . . . . . . . . . . . . . . . . . 7-17
REF Signal At A11TP1 PIN 9 . . . . . . . . . . . . . . . 7-17
High Band REF Signal .. .. .. .. .. . .. .. .. . 7-17
Low Band REF Signal .................. 7-18
FN LO at A12 Check . . . . . . . . . . . . . . . . . . . . 7-19
4 MHz Reference Signal .. .. .. .. .. .. .. .. .. 7-20
Contents-9

2ND LO Waveforms .................... 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 VCO Range Check with Oscilloscope .... .. .. .. 7-26
A14 VCO Exercise . . . . . . . . . . . . . . . . . . . . . 7-28
A14 Divide-by-N Circuit Check . . . . . . . . . . . . . . . 7-29
A14-to-A13 Digital Control Signals Check. . . . . . . . . . . 7-30
H MB Line ....................... 7-32
A7 Pulse Generator Check .................. 7-33
A7 Pulse Generator Check with Spectrum Analyzer .. .. . 7-33
Rechecking the A13/A14 Fractional-N . . . . . . . . . . . . 7-35
A7 Pulse Generator Check with Oscilloscope . . . . . . . . . 7-35
A11 Phase Lock Check . . . . . . . . . . . . . . . . . . . . 7-37
Phase Lock Check with PLL DIAG ............. 7-37
Phase Lock Check by Signal Examination . . . . . . . . . . 7-37
Source Group Troubleshooting Appendix .. .. .. .. . .. . 7-39
Troubleshooting Source Problems with the Analog Bus . . . . . 7-39
Phase Lock Diagnostic Tools .... .. .. .. .. .. .. . 7-39
Phase Lock Error Messages . . . . . . . . . . . . . . . . . 7-39
Phase Lock Diagnostic Routines . . . . . . . . . . . . . . . 7-40
Broadband Power Problems .... .. .. .. .. .. .. . 7-40
8. Receiver Troubleshooting
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 8-2
Receiver Failure Error Messages ................ 8-2
CAUTION: OVERLOAD ON REFL PORT, POWER REDUCED ...... 8-2
CAUTION: OVERLOAD ON TRANS PORT, POWER REDUCED ...... 8-3
Check the R, A, and B Inputs . . . . . . . . . . . . . . . . . . 8-4
Troubleshooting When All Inputs Look Bad ........... 8-7
Run Internal Tests 18 and 17 . . . . . . . . . . . . . . . . . 8-7
Check the 4 MHz REF Signal .................. 8-8
Check A10 by Substitution or Signal Examination ....... 8-8
Troubleshooting When One or More Inputs Look Good . . . . . . 8-11
Check the Frequency Response Correction .......... 8-11
Check the 4 kHz Signal . . . . . . . . . . . . . . . . . . . . 8-11
Check 1st LO Signal at Sampler/Mixer . . . . . . . . . . . . . 8-12
Contents-10

Check 2nd LO Signal at Sampler/Mixer ............ 8-13
Check Input Trace . . . . . . . . . . . . . . . . . . . . . . 8-14
9. Accessories Troubleshooting
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 9-2
Inspect the Accessories . . . . . . . . . . . . . . . . . . . . . 9-3
Inspect the Test Port Connectors and Calibration Devices . . . . 9-3
Inspect the Error Terms .... .. .. .. .. .. .. .. .. 9-3
Cable Test.......................... 9-5
Verify Shorts and Opens ................... 9-6
10. Service Key Menus and Error Messages
Service Key Menus . . . . . . . . . . . . . . . . . . . . . . . 10-1
Error Messages ........................ 10-1
Service Key Menus - Internal Diagnostics .. .. .. .. .. .. 10-2
Tests Menu ......................... 10-3
Test Options Menu . . . . . . . . . . . . . . . . . . . . . . 10-5
Self Diagnose Softkey .................... 10-7
Test Descriptions . . . . . . . . . . . . . . . . . . . . . . . 10-7
Internal Tests .. .. .. .. .. .. .. .. .. .. .. . 10-7
External Tests . . . . . . . . . . . . . . . . . . . . . . . 10-12
System Verication Tests . . . . . . . . . . . . . . . . . . 10-13
Adjustment Tests ..................... 10-14
Display Tests .. .. .. .. .. .. .. .. . .. .. .. 10-16
Test Patterns .. .. .. .. .. .. .. .. .. .. .. . 10-17
Service Key Menus - Service Features . . . . . . . . . . . . . . 10-19
Service Modes Menu . . . . . . . . . . . . . . . . . . . . . 10-20
Service Modes More Menu .................. 10-23
Analog Bus ......................... 10-25
Description of the Analog Bus .. .. .. .. .. .. .. . 10-25
The Main ADC . . . . . . . . . . . . . . . . . . . . . . . 10-25
The Frequency Counter .................. 10-25
Analog In Menu ....................... 10-27
Analog Bus Nodes .... .. .. .. .. .. .. .. .. .. 10-29
A3 Source . . . . . . . . . . . . . . . . . . . . . . . . . 10-29
A10 Digital IF . . . . . . . . . . . . . . . . . . . . . . . 10-36
A11 Phase Lock . . . . . . . . . . . . . . . . . . . . . . 10-37
A12 Reference . . . . . . . . . . . . . . . . . . . . . . . 10-44
A14 Fractional-N (Digital) ................. 10-47
PEEK/POKE Menu . . . . . . . . . . . . . . . . . . . . . . 10-50
Firmware Revision Softkey . . . . . . . . . . . . . . . . . . . 10-51
Contents-11

HP-IB Service Mnemonic Denitions .............. 10-52
Invoking Tests Remotely ................... 10-52
Analog Bus Codes .. .. .. .. .. .. .. .. .. .. . . 10-53
Error Messages ........................ 10-54
11. Error Terms
Error Terms Can Also Serve a Diagnostic Purpose ........ 11-2
Reection 1-Port Error-Correction Procedure .......... 11-4
Response and Isolation Calibration Procedures . . . . . . . . . . 11-6
Error Term Inspection ..................... 11-8
If Error Terms Seem Worse than Typical Values ........ 11-9
Uncorrected Performance .................. 11-9
Error Term Descriptions .................... 11-10
Directivity (E
D
) - After a Reection 1-Port Calibration ..... 11-11
Description ........................ 11-11
Signicant System Components . . . . . . . . . . . . . . . 11-11
Aected Measurements .. .. .. .. .. .. .. .. .. 11-11
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
Source Match (E
S
) - After a Reection 1-Port Calibration . . . . 11-13
Description ........................ 11-13
Signicant System Components . . . . . . . . . . . . . . . 11-13
Aected Measurements .. .. .. .. .. .. .. .. .. 11-13
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
Reection Tracking (E
R
) - After a Reection 1-Port Calibration . 11-15
Description ........................ 11-15
Signicant System Components . . . . . . . . . . . . . . . 11-15
Aected Measurements .. .. .. .. .. .. .. .. .. 11-15
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
Isolation (Crosstalk, E
X
) - After a Response and Isolation
(Transmission) Calibration . . . . . . . . . . . . . . . . . 11-17
Description ........................ 11-17
Signicant System Components . . . . . . . . . . . . . . . 11-17
Aected Measurements .. .. .. .. .. .. .. .. .. 11-17
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Transmission Tracking (E
T
)..... .. .. .. . .. .. .. 11-19
Description ........................ 11-19
Signicant System Components . . . . . . . . . . . . . . . 11-19
Aected Measurements .. .. .. .. .. .. .. .. .. 11-19
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
Contents-12

12. Theory of Operation
How the HP 8752C Works .. .. .. .. .. .. .. .. .. . 12-2
The Built-In Synthesized Source ............... 12-3
The Source Step Attenuator (Option 004) .......... 12-3
The Built-In Transmission/Reection Test Set ......... 12-4
The Receiver Block .. .. .. .. .. .. .. .. .. .. . 12-4
The Microprocessor .. .. .. .. .. .. .. .. .. .. 12-4
A Close Look at the Analyzer's Functional Groups . . . . . . . . 12-5
Power Supply Theory ..................... 12-6
A15 Preregulator ...................... 12-6
Line Power Module .. .. .. .. .. .. .. .. .. .. 12-7
Preregulated Voltages ................... 12-7
Regulated +5V Digital Supply ............... 12-7
Shutdown Indications: the Green LED and Red LED . . . . . 12-7
A8 Post Regulator .... .. .. .. .. .. .. .. .. .. 12-8
Voltage Indications: the Green LEDs ............ 12-8
Shutdown Circuit ..................... 12-8
Variable Fan Circuit and Air Flow Detector .. .. .. .. . 12-8
Display Power . . . . . . . . . . . . . . . . . . . . . . . 12-9
Probe Power ....................... 12-9
Digital Control Theory . . . . . . . . . . . . . . . . . . . . . 12-9
A1 Front Panel Keyboard .................. 12-10
A2 Front Panel Processor . . . . . . . . . . . . . . . . . . . 12-11
A9 CPU/A10 Digital IF . . . . . . . . . . . . . . . . . . . . 12-11
Main CPU . . . . . . . . . . . . . . . . . . . . . . . . . 12-11
Main RAM . . . . . . . . . . . . . . . . . . . . . . . . . 12-11
EEPROM .... .. .. .. .. .. . .. .. .. .. .. 12-12
Digital Signal Processor .................. 12-12
A18 Display . . . . . . . . . . . . . . . . . . . . . . . . . 12-12
A19 GSP .. .. .. .. .. .. .. .. .. .. .. .. .. 12-12
A16 Rear Panel ....................... 12-13
Source Theory Overview . . . . . . . . . . . . . . . . . . . . 12-14
A14/A13 Fractional-N .. .. .. .. .. .. .. .. . .. . 12-14
A12 Reference . . . . . . . . . . . . . . . . . . . . . . . . 12-14
A7 Pulse Generator ..................... 12-14
A11 Phase Lock . . . . . . . . . . . . . . . . . . . . . . . 12-15
A3 Source . . . . . . . . . . . . . . . . . . . . . . . . . . 12-15
Source Low Band Operation .. .. .. .. .. .. .. . .. . 12-16
Source High Band Operation .. .. .. .. .. .. .. .. .. 12-19
Signal Separation .. .. .. .. .. .. .. .. .. .. .. . 12-23
The A30 Dual Directional Coupler .............. 12-23
Contents-13

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 Parts
Assembly Replacement Sequence . . . . . . . . . . . . . . . . 13-2
Save Money with Rebuilt-Exchange Assemblies ......... 13-2
Gather This Information Before Ordering ............ 13-4
Call [phone] to Order Parts Fast (U.S. only) .. .. .. . 13-4
Replaceable Part Listings . . . . . . . . . . . . . . . . . . . . 13-5
Major Assemblies ...................... 13-6
Front Panel Assemblies . . . . . . . . . . . . . . . . . . . . 13-8
Rear Panel Assemblies .................... 13-10
Cables,Top View .. .. .. .. .. .. .. .. .. .. .. 13-12
Front Panel, Cables and Attaching Hardware .. .. .. .. . 13-14
Rear Panel, Cables and Attaching Hardware . . . . . . . . . . 13-16
Source and Sampler Parts: Standard and Option 003 . . . . . . 13-18
Source and Sampler Parts: Option 004/006 .. .. .. .. .. 13-20
Source and Sampler Parts: Options 004 and 003/004 . . . . . . 13-22
Source and Sampler Parts: Option 006 .. .. .. .. .. .. 13-24
Display Bezel Assembly .... .. .. .. .. .. .. .. . 13-26
Chassis Parts ........................ 13-28
Top View of Attaching Hardware and Post Regulator Fuses . . . 13-30
Bottom View of Attaching Hardware .. .. .. .. .. .. . 13-32
Right View of Attaching Hardware .............. 13-34
Left View of Attaching Hardware . . . . . . . . . . . . . . . 13-35
Rear Panel Attaching Hardware ............... 13-36
Replaceable Labels . . . . . . . . . . . . . . . . . . . . . . 13-37
Miscellaneous Parts and Accessories . . . . . . . . . . . . . . 13-38
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . 13-40
Contents-14