HP 8720A Manuals

Manuals and User Guides for HP 8720A. We have 2 HP 8720A manuals available for free PDF download: Service Manual

HP 8720A Service Manual (275 pages)

MICROWAVE NETWORK ANALYZER

Brand: HP | Category: Measuring Instruments | Size: 10.37 MB

Table of Contents
6
Service and Equipment Overview
11
Introduction
11
Organization of the Service Manual
11
Table of Service Test Equipment
13
Preventive Maintenance
15
Introduction
15
Check the Front Panel Connectors
15
Check the Error Terms
15
- Perform a Full 2-Port Calibration
  16
- Plot the Error Terms
  16
Clean the Fan Filter
17
Clean the Glass Filter
18
Verification
19
Operators Check
19
Procedure
20
Equipment
20
In Case of Difficulty
21
System Verification
23
Description
23
Verification Kit
23
System Verification Cycle and
23
- Measurement Uncertainty
  24
Equipment
24
- System Verification
  24
- Connecting Devices
  29
In Case of Failure
30
Connecting the Airlines
31
Calibration Cycle
41
If the Instrument Fails a Test
41
Frequency Range and Accuracy
42
- Performance Test
  42
- Equipment
  42
- Description and Procedure
  42
- If the Instrument Fails this Test
  42
Power Level Performance Test
43
- Equipment
  43
- Description and Procedure
  43
- If the Instrument Fails this Test
  44
Dynamic Range Performance Test
45
- Equipment
  45
- Description and Procedure
  45
- If the Instrument Fails this Test
  45
Option 003 Performance Test Record
45
Performance Test Record
46
Adjustments
48
Order of Adjustments
48
Test Equipment
49
Instrument Cover Removal
49
A9 CC (Correction Constant) Jumper Position
49
A9 CC Jumper Position Procedure
50
- Focus Adjustments
  51
Equipment
51
- Description and Procedure
  51
HP 8719A/20B Display Lntensity
53
- Adjustments
  54
- Description and Procedure
  56
Serial Number Correction Constant
57
- Description and Procedure
  57
Option Numbers Correction Constant
58
- Description and Procedure
  58
Analog Bus Correction Constants
60
- Description and Procedure
  60
IF Amplifier Correction Constants
60
- Equipment
  60
ADJUSTMENTS (Cont'D)
61
ADC Linearity Correction Constants
61
- Equipment
  61
- Description and Procedure
  61
Source Pretune Correction Constants
62
- Equipment
  62
- Description and Procedure
  62
EEPROM Backup Disk Procedure
63
- Equipment
  63
- Description and Procedure
  63
- How to Make an EEPROM Backup
  63
  - Data to It
    63
  - The EEPROM Backup Disk
    64
HP 8720A Display Image Size. Position and Trace Alignment Adjustments
65
- Description and Procedure
  65
Reference Assembly VCO Tune Adjustment
66
- Description and Procedure
  66
Frequency Accuracy Adjustment
67
- Equipment
  67
- Description and Procedure
  67
Sampler Check
68
- Description and Procedure
  68
- A Sampler Check
  68
- B Sampler Check
  68
- R Sampler Check
  69
Power Adjustments
70
- Equipment
  70
Low Band Power Level Adjustment
70
- Description and Procedure
  70
Automatic Leveling Control Adjustment
73
- Description and Procedure
  73
Optional Fractional-N Spur and
74
- FM Sideband Adjustment
  74
- Description and Procedure
  75
Cal Kit Defaults Correction Constants
76
- Description Ande Procedure
  76
Introduction
79
Troubleshooting HP-IB Systems
80
- Controllers
  80
Isolate Faulty Group
84
Introduction
84
Power Supply
84
Digital Control
85
Source
85
Receiver
86
Accessories
86
Isolate Faulty Group Worksheets
88
Power Supply
90
Introduction
90
- LED State Definitions
  90
Start here
92
- Fan
  92
- Power Supply Error Messages
  92
Check A15 Preregulator and Loads
92
- Check A15 Green LED on Rear Panel
  92
- Check A15 and +5V Loads
  93
- Remove A51 Loads
  94
Check A8 Post-Regulator and Loads
95
- Checkfan Display
  96
- Check Assemblies Loading
  96
- Supply
  96
A8 Leds Are Not All on
96
- Check A8 Alone
  97
- Check Upper Box Assemblies
  97
- Check Lower Box Assemblies
  97
- Check the Display
  97
- Measure A8 Fan Voltages
  98
- Measure A15 Fan Voltages
  98
Display Power Troubleshooting
99
- Verify A8 Display Voltages
  99
Test Point Voltages
101
- In Case of Difficulty
  102
Introduction
103
Digital Control
103
Start here
103
- Abus Test Failure
  103
Fatal Errors
103
- HP-IB Failures
  103
- Preliminary Checks (All Models)
  104
Display Check (All Models)
104
DIGITAL CONTROL (Cont'D)
106
Diagnostic Checks
106
Front Panel Control Check (All Models)
106
Fatal Error Troubleshooting
108
Display Troubleshooting (All Models)
108
HP 8719A/20B Display Troubleshooting
108
HP 8720A Display Troubleshooting
111
- Check Display Power Supplies
  111
- Check Display Test Pattern
  113
- Check Display Intensity and Focus
  113
- Identify the Faulty Assembly
  116
HP-IB Troubleshooting
116
- No Front Panel Control
  116
- Stuckkey
  117
Source
119
Start here
119
Broadband Phase Lock Problems
121
- Check A7 ALC by Disconnecting W2
  122
- Swap Samplers to Check A64 R Sampler
  122
- Check Open Loop Power
  122
- Check A12 Reference
  123
- Check A14 Fractional-N
  123
- A14 VCO Range Check with Oscilloscope
  124
- A14 VCO Exercise
  125
- A14 Divide-By-N Circuit Check
  126
- A14-To-A13 Digital Control Signals Check
  126
- A52 Pulse Generator Check
  127
Broadband Power Problems
131
- A7 Alcisignal Separation Check
  131
- A69 Step Attenuator Check
  131
HP 8719 and HP 8720
131
- A67 Power Splitter Check
  132
- Measuring Lower Box Bias Voltages
  132
Receiver
134
Introduction
134
Start here
134
All Signal Paths Look Bad
135
- 2Nd lo Check
  135
- Mhz Check
  135
- At Least One Signal Path Looks Good
  135
Directional Coupler Check
136
A and B Sampler Check by Substitution
137
- Sampler Voltage Check
  137
- 2Nd Converter Check
  137
Accessories
139
Introduction
139
Start here
139
Inspectandgageconnectors
140
Switch Repeatability
140
Inspect Error Terms
141
- Isolate the Fault in the RF Path
  142
- Cable Test
  143
- Verify Shorts and Opens
  144
Service Key Menus
146
Introduction
146
Internal Diagnostics Summary
146
Tests Menu
147
Test Options Menu
148
Self Diagnose Softkey
149
Test Descriptions
149
- Internal Tests
  149
- External Tests
  151
- Sys Ver Tests
  151
- Adjustment Tests
  152
- Display Tests (HP 8719A120B)
  152
- Test Patterns
  153
Service Modes Summary
154
Service Modes more Menu
156
SRC Tune Menu
156
SERVICE KEY MENUS (Cont'D)
157
ALC on off Softkey
157
Peekipoke Menu
157
Firmware Revision Softkey
158
Input Ports Menu
158
Analog Bus Menu
159
Description of the Analog Bus
159
- The Frequency Counter
  160
- Notes
  160
Analog Bus Nodes
160
- A10 Digital if
  161
- A L L Phase Lock
  164
- A12 Reference
  164
- A14 Fractional-N (Digital)
  165
- Invoking Tests Remotely
  166
- Symbol Conventions
  166
- Analog Bus Codes
  167
Error Terms
169
Error Term Inspection
171
- Hardcopy Procedure
  172
Error Term Descriptions
172
- Directivity (EDF and EDR)
  173
- Source Match (ESF and ESR)
  174
- Reflection Tracking (ERF and ERR)
  175
- Isolation (Crosstalk. EXF and EXR)
  176
- Load Match (ELF and ELR)
  177
- Transmission Tracking (ETF and ETR)
  178
Introduction
179
Theory of Operation
179
System Operation
179
Functional Groups of the Analyzer
180
Power Supply Theory
181
- A15 Preregulator
  181
- A8 Post-Regulator
  182
Digital Control Theory
184
- A1 Front Panel
  185
- A2 Front Panel Processor
  185
- A9 Cpu
  185
- A18 Display
  186
- A16 Rear Panel
  186
Source Group Theory
187
- Source Pretune
  188
- A14/A13 Fractional-N Synthesizer
  188
- Harmonic Comb
  188
- Phase Locked Sweep
  189
- A12 Reference: the Crystal Reference Frequencies
  189
- Signals
  190
- A7 ALC: Automatic Leveling Control
  191
Signal Separation
193
- A67 Power Splitter. A68 Attenuator
  193
- A69 Step Attenuator
  193
- S4 Transfer Switch
  194
- A56 Lower Front Panel Assembly
  194
- A60 and A61 DC Bias Tees
  194
- A62 and A63 Directional Couplers
  194
Receiver Theory
195
- Samplers and Second Converters
  195
- A10 Digital if
  196
Replaceable Parts
197
Introduction
197
Replaceable Parts Figures
197
Adjustments and Verification
197
(R-E) Rebuilt-Exchange Assemblies Cost Less
197
Ordering Information
198
- How to Order Parts Fast
  198
Introduction
231
Replacement Procedures
231
Adjustments and Performance Tests
231
Cover Removal
231
- Tools Required
  233
- Procedure
  233
- To Disassemble
  233
- To Remove the Rotary Pulse
  233
A18 Display Replacement
235
- To Disassemble
  235
- To Remove the A16 Rear Panel Assembly
  240
- To Remove the Preregulator
  240
- To Reassemble
  240
A64/A65/A66 Sampler Replacement
242
- Tools Required
  242
- Procedure
  242
- To Disassemble
  242
- To Remove the a or B Sampler
  242
- To Remove the R Sampler
  242
- To Reassemble
  245
- A62/A63 Directional Couplers
  246
- Tools Required
  246
- Procedure
  246
- To Remove the Front Panel Board
  246
A60/A61 Bias Tees and S4 Transfer Switch Replacement
250
- Tools Required
  250
- To Remove the Bias Tees
  250
- To Remove the Transfer Switch
  250
- To Reassemble
  250
A69 Step Attenuator Replacement
251
- Tools
  251
- Procedure
  251
- To Disassemble
  251
- To Reassemble
  251
A51 Interface Replacement
252
- Tools Required
  252
- Procedure
  252
- To Disassemble
  252
- To Reassemble
  254
A53 Mixer/Amplifier Replacement
257
- Tools Required
  257
- Procedure
  257
- To Disassemble
  257
- To Reassemble
  257
- A55 YIG 1/A54 YIG 2 Replacement
  259
- Tools Required
  259
- Procedure
  259
- To Disassemble
  259
- To Reassemble
  259
- S1/S2/S3 Microwave Switch Replacement
  260
- Tools Required
  260
- Procedure
  260
- To Disassemble
  260
- To Reassemble
  260
Introduction
262
Instrument History
265
Introduction
265
Index
269

HP 8720A Service Manual (273 pages)

Microwave Network Analyzer

Brand: HP | Category: Measuring Instruments | Size: 7.47 MB

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HP 8720A Service Manual (273 pages)

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