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Performance Tests and
Adjustments Manual
HP 8568B Spectrum Analyzer
HEWLETT
PACKARD
HP Part No. 08568-90118
Printed in USA September 1993
@Copyright Hewlett-Packard Company 1993
All Rights Reserved. Reproduction, adaptation, or translation without
prior written permission is prohibited, except as allowed under the
copyright laws.
1212 Valley House Drive, Rohnert Park, CA 94928-4999, USA
Certification Hewlett-Packard Company certifies that this product met its
published specifications at the time of shipment from the factory.
Hewlett-Packard further certifies that its calibration measurements
are traceable 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.
Warranty This Hewlett-Packard instrument product is warranted against defects
in material and workmanship for a period of one year from date of
shipment. During the warranty period, Hewlett-Packard Company
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 Hewlett-Packard. Buyer shall prepay
shipping charges to Hewlett-Packard and Hewlett-Packard shall pay
shipping charges to return the product to Buyer. However, Buyer shall
pay all shipping charges, duties, and taxes for products returned to
Hewlett-Packard from another country.
Hewlett-Packard warrants that its software and firmware designated
by Hewlett-Packard for use with an instrument will execute
its programming instructions when properly installed on that
instrument. Hewlett-Packard does not warrant that the operation
of the instrument, or software, or firmware will be uninterrupted or
error-free.
L IMITATION OF W ARRANTY
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 preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.
HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.
E XCLUSIVE R EMEDIES
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.
...
III
Assistance Product maintenance agreements and other customer assistance
agreements are available for Hewlett-Rwkard products.
Fbr any assistance, contact your nearest Hewlett-Packard Sales and
Service OJke.
Safety Symbols The following safety symbols are used throughout this manual.
Familiarize yourself with each of the symbols and its meaning before
operating this instrument.
Caution The caution sign denotes a hazard. It calls attention to a procedure
which, 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 The warning sign 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
sign until the indicated conditions are fully understood and met.
General Safety
Considerations
Warning Before this instrument is switched on, make sure it has been
properly grounded through the protective conductor of the ac
power cable to a socket outlet provided with protective earth
contact.
Any interruption of the protective (grounding) conductor, inside
or outside the instrument, or disconnection of the protective
earth terminal can result in personal injury.
Warning There are many points in the instrument which can, if contacted,
cause personal injury. Be extremely careful.
Any adjustments or service procedures that require operation
of the instrument with protective covers removed should be
performed only by trained service personnel.
Caution Before this instrument is switched on, make sure its primary power
circuitry has been adapted to the voltage of the ac power source.
Failure to set the ac power input to the correct voltage could cause
damage to the instrument when the ac power cable is plugged in.
V
HP 8568B Included with the HP Model 8568B Spectrum Analyzer are three
Spectrum Analyzer manuals: the Installation and Verification Manual, the Operating and
Programming Manual, and the Performance Tests and Adjustments
Documentation Manual.
Outline
HP 8568B Installation General information, installation, specifications, characteristics, and
and Verification operation verification.
Manual
HP 8568B Operating Manual and remote operation, including complete syntax and
and Programming command description. Accompanying this manual is the separate,
Manual pocket-sized Quick Reference Guide.
HP 8568B Electrical performance tests and adjustment procedures.
Performance Tests and
Adjustments Manual
HP 85680B RF Section RF Section service information.
Troubleshooting and
Repair Manual
HP 85662A IF-Display IF-Display Section service information.
Section
Troubleshooting and
Repair Manual
vi
Contents
1. General Information
Introduction . . . . . . . . . . . . . . . . . . . . . l-l
Instruments Covered by this Manual . . . . . . . . . l-l
Operation Verification . . . . . . . . . . . . . . . . l-2
Option 462 Instruments . . . . . . . . . . . . . . . 1-2
Option 857 Instruments . . . . . . . . . . . . . . . l-2
2. Performance Tests
Introduction . . . . . . . . . . . . . . . . . . . . . 2-l
Verification of Specifications . . . . . . . . . . . . . 2-l
Calibration Cycle . . . . . . . . . . . . . . . . . . 2-l
Equipment Required . . . . . . . . . . . . . . . . 2-2
Test Record . . . . . . . . . . . . . . . . . . . . 2-2
1. Center Frequency Readout Accuracy Test . . . . 2-3
2. Frequency Span Accuracy Test . . . . . . . . . 2-6
3. Sweep Time Accuracy Test (220 ms) . . . . . . 2-9
4. Resolution Bandwidth Accuracy Test . . . . . . 2-13
5. Resolution Bandwidth Selectivity Test . . . . . . 2-15
6. Resolution Bandwidth Switching Uncertainty Test 2-18
7. Input Attenuator Switching Uncertainty Test . . 2-20
8. Frequency Response Test . . . . . . . . . . . . 2-22
9. RF Gain Uncertainty Test . . . . . . . . . . . . 2-31
10. IF Gain Uncertainty Test . . . . . . . . . . . 2-33
11. Log Scale Switching Uncertainty Test . . . . . 2-39
12. Amplitude Fidelity Test . . . . . . . . . . . . 2-41
13. Average Noise Level Test . . . . . . . . . . . 2-45
14. Residual Responses Test . . . . . . . . . . . . 2-47
15. Spurious Responses Test . . . . . . . . . . . . 2-49
16. Residual FM Test . . . . . . . . . . . . . . . 2-56
17. Line-Related Sidebands Tests . . . . . . . . . 2-60
18. Calibrator Amplitude Accuracy Test . . . . . . 2-62
19. Fast Sweep Time Accuracy Test (~20 ms) . . . . 2-63
20. 1st LO Output Amplitude Test . . . . . . . . . 2-66
21. Frequency Reference Error Test . . . . . . . . 2-67
`Ihble 2-19. Performance Test Record . . . . . . . . . . 2-69
Test 1. Center Frequency Readout Accuracy Test . . . 2-70
Test 2. Frequency Span Accuracy Test . . . . . . . . 2-71
Test 3. Sweep Time Accuracy . . . . . . . . . . . . 2-72
Test 4. Resolution Bandwidth Accuracy . . . . . . . 2-73
Test 5. Resolution Bandwidth Selectivity . . . . . . . 2-74
Test 6. Resolution Bandwidth Switching Uncertainty
Test . . . . . . . . . . . . . . . . . . . . . . 2-75
Test 7. Input Attenuator Switching Uncertainty Test . 2-76
Test 8. Frequency Response Test . . . . . . . . . . 2-77
Test 9. RF Gain Uncertainty Test . . . . . . . . . . 2-78
Test 10. IF Gain Uncertainty Test . . . . . . . . . . 2-79
Contents-l
Test 11. Log Scale Switching Uncertainty Test . . . . 2-82
Test 12. Amplitude Fidelity Test . . . . . . . . . . . 2-83
Test 13. Average Noise Level Test . . . . . . . . . . 2-84
Test 14. Residual Responses Test . . . . . . . . . . . 2-85
Test 15. Spurious Responses Test . . . . . . . . . . 2-86
Test 16. Residual FM Test . . . . . . . . . . . . . . 2-87
Test 17. Line-Related Sidebands Test . . . . . . . . . 2-88
Test 18. Calibrator Amplitude Accuracy Test . . . . . 2-89
Test 19. Fast Sweep Time Accuracy Test (~20 ms) . . 2-90
Test 20. 1st LO Output Amplitude Test . . . . . . . . 2-91
Test 21. Frequency Reference Error Test . . . . . . . 2-92
3. Adjustments
Introduction . . . . . . . . . . . . . . . . . . . . . 3-l
Safety Considerations . . . . . . . . . . . . . . . . . 3-2
Equipment Required . . . . . . . . . . . . . . . . . 3-2
Adjustment Tools . . . . . . . . . . . . . . . . . . . 3-2
Factory-Selected Components . . . . . . . . . . . . . 3-3
Related Adjustments . . . . . . . . . . . . . . . . . 3-4
Location of Test Points and Adjustments . . . . . . . . 3-4
1. Low-Voltage Power Supply Adjustments . . . . . . 3-25
2. High-Voltage Adjustment (SN 3001A and Below) . . 3-29
2. High-Voltage Adjustment (SN 3004A and Above) . . 3-39
3. Preliminary Display Adjustments (SN 3001A and
Below) . . . . . . . . . . . . . . . . . . . . . 3-45
3. Preliminary Display Adjustments (SN 3004A and
Above) . . . . . . . . . . . . . . . . . . . . . 3-52
4. Final Display Adjustments (SN 3001A and Below) . 3-59
4. Final Display Adjustments (SN 3004A and Above) . 3-61
5. Log Amplifier Adjustments . . . . . . . . . . . . 3-65
6. Video Processor Adjustments . . . . . . . . . . . 3-69
7. 3 MHz Bandwidth Filter Adjustments . . . . . . . 3-72
8. 21.4 MHz Bandwidth Filter Adjustments . . . . . 3-77
9. 3 dB Bandwidth Adjustments . . . . . . . . . . 3-84
10. Step Gain and 18.4 MHz Local Oscillator
Adjustments . . . . . . . . . . . . . . . . . . 3-87
11. Down/Up Converter Adjustments . . . . . . . . 3-92
12. Time Base Adjustment (SN 2840A and Below, also
32 17AO5568 and Above) . . . . . . . . . . . . . 3-95
12. Time Base Adjustment (SN 2848A to 3217A05567) 3-99
13. 20 MHz Reference Adjustments . . . . . . . . . 3-103
14. 249 MHz Phase Lock Oscillator Adjustments . . . 3-107
15. 275 MHz Phase Lock Oscillator Adjustment . . . . 3-110
16. Second IF Amplifier and Third Converter
Adjustment . . . . . . . . . . . . . . . . . . . 3-112
17. Pilot Second IF Amplifier Adjustments . . . . . . 3-116
18. Frequency Control Adjustments . . . . . . . . . 3-119
19. Second Converter Adjustments . . . . . . . . . 3-123
20. 50 MHz Voltage-Tuned Oscillator Adjustments . . 3-130
2 1. Slope Compensation Adjustments . . . . . . . . 3-133
22. Comb Generator Adjustments . . . . . . . . . . 3-136
23. Analog-To-Digital Converter Adjustments . . . . . 3-139
24. Track and Hold Adjustments . . . . . . . . . . . 3-142
25. Digital Storage Display Adjustments . . . . . . . 3-145
Low-Noise DC Supply . . . . . . . . . . . . . . . . 3-150
Contents-2
Crystal Filter Bypass Network Configuration . . . . . 3-151
4. Option 462
Introduction . . . . . . . . . . . . . . . . . . . . . 4-l
4. 6 dB Resolution Bandwidth Accuracy Test . . . . . 4-2
4. Impulse and Resolution Bandwidth Accuracy Test . 4-4
5. 6 dB Resolution Bandwidth Selectivity Test . . . . 4-10
5. Impulse and Resolution Bandwidth Selectivity Test . 4-13
6. Impulse and Resolution Bandwidth Switching
Uncertainty Test . . . . . . . . . . . . . . . . 4-16
Test 4. 6 dB Resolution Bandwidth Accuracy Test (p/o
Table 2-19, Performance Test Record) . . . . . . . 4-18
Test 4. Impulse and Resolution Bandwidth Accuracy
Test (p/o Table 2-19, Performance Test Record) . . 4-19
Test 5. 6 dB Resolution Bandwidth Selectivity (p/o
`Ihble 2-19, Performance Test Record) . . . . . . . 4-21
Test 5. Impulse and Resolution Bandwidth Selectivity
(p/o Table 2-19, Performance Test Record) . . . . . 4-22
Test 6. Impulse and Resolution Bandwidth Switching
Uncertainty (p/o `Iable 2-19, Performace Test
Record) . . . . . . . . . . . . . . . . . . . . . 4-23
9. 6 dB Resolution Bandwidth Adjustments . . . . . 4-24
9. Impulse Bandwidth Adjustments . . . . . . . . . 4-27
5. Option 857
Introduction . . . . . . . . . . . . . . . . . . . . . 5-l
12. Option 857 Amplitude Fidelity Test . . . . . . . 5-2
Performance Test Record . . . . . . . . . . . . . . . 5-7
Test 12. Option 857 Amplitude Fidelity Test . . . . . 5-8
6. Major Assembly and Component Locations
IF-Display Section Figure Index . . . . . . . . . . . . 6-l
RF Section Figure Index . . . . . . . . . . . . . . . 6-2
Contents-3
Figures
l-l. Service Accessories, HP Part Number 08568-60001 . . l-8
2-l. Center Frequency Accuracy Test Setup . . . . . . . . 2-3
2-2. Center Frequency Readout Error Measurement . . . . 2-4
2-3. Frequency Span Accuracy Test Setup . . . . . . . . 2-6
2-4. Sweep Time Accuracy Test Setup . . . . . . . . . . 2-9
2-5. Penlift Output Signal . . . . . . . . . . . . . . . . 2-11
2-6. Resolution Bandwidth Measurement . . . . . . . . . 2-14
2-7. 60 dB Bandwidth Measurement . . . . . . . . . . . 2-16
2-8. Bandwidth Switching Uncertainty Measurement . . . 2-19
2-9. Attenuator Switching Uncertainty Test Setup . . . . . 2-20
2-10. Attenuator Switching Uncertainty Measurement . . . 2-21
2-l 1. Frequency Response Test Setup (20 MHz to 1.5 GHz) . 2-22
2-12. Frequency Response Measurement (20 MHz to 1.5 GHz) 2-24
2-13. Frequency Response Test Setup (100 kHz to 20 MHz) . 2-25
2-14. Frequency Response Measurement (100 kHz to 20 MHz) 2-26
2-15. Frequency Response Test Setup (100 Hz to 100 kHz) . 2-27
2-16. RF Gain Uncertainty Measurement . . . . . . . . . 2-32
2-17. IF Gain Uncertainty Test Setup . . . . . . . . . . . 2-33
2-18. IF Gain Uncertainty Measurement . . . . . . . . . . 2-35
2-19. IF Gain Uncertainty Measurement (2 dB) . . . . . . . 2-36
2-20. Log Scale Switching Uncertainty Measurement . . . . 2-40
2-21. Amplitude Fidelity Test Setup . . . . . . . . . . . . 2-41
2-22. Amplitude Fidelity Measurement . . . . . . . . . . 2-43
2-23. Average Noise Level Measurement . . . . . . . . . . 2-46
2-24. Residual Responses Measurement . . . . . . . . . . 2-48
2-25. Harmonic Distortion Test Setup . . . . . . . . . . . 2-50
2-26. Intermodulation Distortion Test Setup . . . . . . . . 2-52
2-27. Intermodulation Distortion Products . . . . . . . . . 2-53
2-28. Bandwidth Filter Slope Measurement . . . . . . . . 2-57
2-29. Slope Detected Residual FM . . . . . . . . . . . . . 2-58
2-30. Peak-to-Peak Amplitude Measurement . . . . . . . . 2-58
2-31. Line Related Sidebands Measurement . . . . . . . . 2-61
2-32. Calibrator Amplitude Accuracy Test Setup . . . . . . 2-62
2-33. Fast Sweep Time Accuracy (~20 ms Test Setup) . . . . 2-63
2-34. Fast Sweep Time Measurement (~20 ms) . . . . . . . 2-64
2-35. 1st LO Output Amplitude Test Setup . . . . . . . . . 2-66
2-36. Frequency Reference Test Setup . . . . . . . . . . . 2-68
3-l. Low-Voltage Power Supply Adjustments Setup . . . . 3-25
3-2. IF-Display Section Low-Voltage Adjustments (SN 3001A
and Below) . . . . . . . . . . . . . . . . . . . 3-26
3-3. IF-Display Section Low-Voltage Adjustments (SN 3004A
and Above) . . . . . . . . . . . . . . . . . . . 3-26
3-4. Location of RF Section Low-Voltage Adjustments . . . 3-27
3-5. High Voltage Adjustment Setup . . . . . . . . . . . 3-30
3-6. Location of High Voltage Adjustments . . . . . . . . 3-31
3-7. Location of Label and Test Point . . . . . . . . . . . 3-32
Contents-4
3-8. Location of AlA Components . . . . . . . . . . . 3-34
3-9. CRT Cut-Off Voltage 3-35
3-10. Waveform at AlA3TP5' : : : : : : : : : : : : : : : 3-36
3-11. Discharging the CRT Post-Accelerator Cable . . . . . 3-38
3-12. High Voltage Adjustment Setup . . . . . . . . . . . 3-40
3-13. Location of High Voltage Adjustments . . . . . . . . 3-41
3-14. Location of AlA Label and Test Point . . . . . . . . 3-42
3-15. Discharging the CRT Post-Accelerator Cable . . . . . 3-44
3-16. Preliminary Display Adjustments Setup . . . . . . . 3-46
3-17. Location of AlA2, AlA4, AlA5, and A3A2 . . . . . 3-47
3-18. AlA2, AlA4, and AlA Adjustment Locations . . . . 3-47
3-19. X+ and X- Waveforms . . . . . . . . . . . . . . . 3-48
3-20. Composite X Deflection Waveform . . . . . . . . . . 3-49
3-21. Rise and Fall Times and Overshoot Adjustment
Waveform . . . . . . . . . . . . . . . . . . . 3-49
3-22. 5OV,-, Signal . . . . . . . . . . . . . . . . . . . . 3-51
3-23. Preliminary Display Adjustments Setup . . . . . . . 3-53
3-24. Location of AlA and A3A2 . . . . . . . . . . . . 3-54
3-25. AlA Adjustment Locations . . . . . . . . . . . . . 3-54
3-26. X+ and X- Waveforms . . . . . . . . . . . . . . . 3-55
3-27. Composite X Deflection Waveform . . . . . . . . . . 3-56
3-28. Rise and Fall Times and Overshoot Adjustment
Waveform . . . . . . . . . . . . . . . . . . . 3-56
3-29. 5OV,-, Signal . . . . . . . . . . . . . . . . . . . . 3-58
3-30. Location of Final Display Adjustments on AlA2, AlA4,
and AlA5. . . . . . . . . . . . . . . . . . . . 3-60
3-31. Final Display Adjustments Setup . . . . . . . . . . . 3-61
3-32. Location of Final Display Adjustments on AlA . . . 3-62
3-33. Log Amplifier Adjustments Setup . . . . . . . . . . 3-65
3-34. Location of Log Amplifier Adjustments . . . . . . . . 3-66
3-35. Video Processor Adjustments Setup . . . . . . . . . 3-69
3-36. Location of Video Processor Adjustments . . . . . . . 3-70
3-37. 3 MHz Bandwidth Filter Adjustments Setup . . . . . 3-72
3-38. Location of Center, Symmetry, and 10 Hz Amplitude
Adjustments . . . . . . . . . . . . . . . . . . 3-73
3-39. Location of 3 MHz Peak Adjustments . . . . . . . . . 3-75
3-40. 21.4 MHz Bandwidth Filter Adjustments Setup . . . . 3-77
3-41. Location of A4A4 21.4 MHz LC Filter Adjustments . . 3-78
3-42. Location of A4A4 21.4 MHz Crystal Filter Adjustments 3-79
3-43. Location of A4AS 21.4 MHz LC Filter and Attenuation
Adjustments . . . . . . . . . . . . . . . . . . 3-80
3-44. Location of A4A8 21.4 MHz Crystal Filter Adjustments 3-81
3-45. Location of 3 dB Bandwidth Adjustments . . . . . . 3-85
3-46. Step Gain and 18.4 MHz Local Oscillator Adjustments
Setup . . . . . . . . . . . . . . . . . . . . . . 3-87
3-47. Location of IF Gain Adjustment . . . . . . . . . . . 3-88
3-48. Location of 10 dB Gain Step Adjustments . . . . . . 3-89
3-49. Location of .l dB Gain Step, 18.4 MHz LO, and + 1OV
Adjustments . . . . . . . . . . . . . . . . . . 3-91
3-50. Down/Up Converter Adjustments Setup . . . . . . . 3-92
3-51. Location of Down/Up Converter Adjustments . . . . . 3-93
3-52. Time Base Adjustment Setup . . . . . . . . . . . . 3-95
3-53. Location of A27Al Adjustment . . . . . . . . . . . 3-98
3-54. Time Base Adjustment Setup . . . . . . . . . . . . 3-99
3-55. Location of A27A2 Adjustment . . . . . . . . . . . 3-102
Contents-5
3-56. 20 MHz Reference Adjustments Setup . . . . . . . . 3-103
3-57. Location of 20 MHz Reference Adjustments . . . . . 3-104
3-58. Typical Signal at A16TP3 . . . . . . . . . . . . . . 3-106
3-59. 249 MHz Phase Lock Oscillator Adjustments Setup . . 3-107
3-60. Location of 249 MHz Phase Lock Oscillator Adjustments 3-108
3-61. 275 MHz Phase Lock Oscillator Adjustment Setup . . . 3-110
3-62. Location of 275 MHz PLO Adjustment . . . . . . . . 3-111
3-63. Second IF Amplifier Adjustments Setup . . . . . . . 3-112
3-64. Location of 301.4 MHz BPF and 280 MHz AMPTD
Adjustments . . . . . . . . . . . . . . . . . . 3-114
3-65. 301.4 MHz Bandpass Filter Adjustment Waveform . . 3-l 14
3-66. Minimum Image Response at 258.4 MHz . . . . . . . 3-115
3-67. Pilot Second IF Amplifier Adjustments Setup . . . . . 3-116
3-68. Location of 269 MHz Bandpass Filter Adjustments . . 3-118
3-69. 269 MHz Bandpass Filter Adjustments Waveforms . . 3-118
3-70. Frequency Control Adjustments Setup . . . . . . . . 3-119
3-71. Location of Frequency Control Adjustments . . . . . 3-120
3-72. Second Converter Adjustments Setup . . . . . . . . 3-123
3-73. Location of Second Converter Adjustments . . . . . . 3-124
3-74. Typical PILOT 2ND IF Bandpass (SHIFT t) . . . . . . 3-127
3-75. Typical PILOT 2ND IF Bandpass (SHIFT 1) . . . . . . 3-127
3-76. Typical Bandpass (SHIFT t) . . . . . . . . . . . . . 3-128
3-77. Typical Bandpass (SHIFT 1) . . . . . . . . . . . . . 3-128
3-78. 50 MHz Voltage-Tuned Oscillator Adjustments Setup . 3-130
3-79. Location of 50 MHz VT0 Adjustments . . . . . . . . 3-131
3-80. Slope Compensation Adjustment Setup . . . . . . . . 3-133
3-81. Location of A22R66 TILT Adjustment . . . . . . . . 3-135
3-82. Slope Compensation Adjustment Waveforms . . . . . 3-135
3-83. Location of Comb Generator Adjustments . . . . . . 3-136
3-84. Comb Teeth Display . . . . . . . . . . . . . . . . . 3-137
3-85. Analog-To-Digital Converter Adjustments Setup . . . . 3-139
3-86. Location of Analog-To-Digital Converter Adjustments . 3-140
3-87. Track and Hold Adjustments Setup . . . . . . . . . 3-142
3-88. Location of Track and Hold Adjustments . . . . . . . 3-143
3-89. Digital Storage Display Adjustments Setup . . . . . . 3-145
3-90. Location of Digital Storage Display Adjustments . . . 3-146
3-91. Sample and Hold Balance Adjustment Waveforms . . . 3-147
3-92. Waveform Before Adjustment . . . . . . . . . . . . 3-147
3-93. Low-Noise DC Supply . . . . . . . . . . . . . . . . 3-150
3-94. Crystal Filter Bypass Network Configurations . . . . . 3-151
4-l. Resolution Bandwidth Measurement . . . . . . . . . 4-3
4-2. Impulse Bandwidth Test Setup . . . . . . . . . . . . 4-4
4-3. 6 dB Resolution Bandwidth Measurement . . . . . . 4-8
4-4. 60 dB Bandwidth Measurement . . . . . . . . . . . 4-11
4-5. 60 dB Bandwidth Measurement . . . . . . . . . . . 4-14
4-6. Bandwidth Switching Uncertainty Measurement . . . 4-17
4-7. Location of Bandwidth Adjustments . . . . . . . . . 4-25
4-8. Location of Bandwidth Adjustments . . . . . . . . . 4-28
5.1. Option 857 Amplitude Fidelity Test Setup . . . . . . 5-2
6-l. RF Section, Top View . . . . . . . . . . . . . . . . 6-4
6-2. RF Section, Front View . . . . . . . . . . . . . . . 6-5
6-3. RF Section, Bottom View . . . . . . . . . . . . . . 6-6
6-4. IF Section, Top View (SN 3001A and Below) . . . . . 6-7
6-5. IF Section, Top View (SN 3004A and Above) . . . . . 6-8
6-6. IF Section, Front View . . . . . . . . . . . . . . . 6-9
Contents-6
6-10
6-7. IF Section, Bottom View . . . . . . . . . . . . . .
Contents-7
lhbles
2-l. Performance Test Cross-Reference . . . . . . . . . . 2-2
2-2. Center Frequency Readout Error Test Record . . . . . 2-5
2-3. Wide Span Error . . . . . . . . . . . . . . . . . . 2-7
2-4. Span Error . . . . . . . . . . . . . . . . . . . . . 2-8
2-5. Sweep Time Accuracy, Sweep Times 220 ms . . . . . 2-11
2-6. Sweep Time Accuracy, Sweep Times ~20 s . . . . . . 2-12
2-7. Sweep Time Accuracy, Sweep Times 220 ms (Alternate
Procedure) . . . . . . . . . . . . . . . . . . . 2-12
2-8. Bandwidth Accuracy . . . . . . . . . . . . . . . . 2-14
2-9. Resolution Bandwidth Selectivity . . . . . . . . . . 2-17
2-10. Bandwidth Switching Uncertainty . . . . . . . . . . 2-19
2-11. Input Attenuator Switching Uncertainty . . . . . . . 2-21
2-12. IF Gain Uncertainty, 10 dB Steps . . . . . . . . . . 2-35
2-13. IF Gain Uncertainty, 2 dB Steps . . . . . . . . . . . 2-36
2-14. IF Gain Uncertainty, 0.1 dB Steps . . . . . . . . . . 2-38
2-15. Log Scale Switching Uncertainty . . . . . . . . . . . 2-40
2-16. Log Amplitude Fidelity . . . . . . . . . . . . . . . 2-42
2- 17. Linear Amplitude Fidelity . . . . . . . . . . . . . . 2-44
2-18. Fast Sweep Time Accuracy (~20 ms) . . . . . . . . . 2-65
3-1. Adjustment Cross Reference . . . . . . . . . . . . . 3-3
3-2. Adjustable Components . . . . . . . . . . . . . . . 3-5
3-3. Factory-Selected Components . . . . . . . . . . . . 3-13
3-4. Standard Value Replacement Capacitors . . . . . . . 3-20
3-5. Standard Value Replacement 0.125 Resistors . . . . . 3-21
3-6. Standard Value Replacement 0.5 Resistors . . . . . . 3-23
3.5. Initial Adjustment Positions . . . . . . . . . . . . . 3-59
3-6. Initial Adjustment Positions . . . . . . . . . . . . . 3-62
3-7. Parts for Low-Noise DC Supply . . . . . . . . . . . 3-150
3-8. Crystal Filter Bypass Network Configuration for A4A4
and A4A8 (21.4 MHz) . . . . . . . . . . . . . . 3-151
3-9. Crystal Filter Bypass Network Configuration for A4A7
(3 MHz) . . . . . . . . . . . . . . . . . . . . . 3-151
4-l. 6 dB Resolution Bandwidth Accuracy . . . . . . . . 4-3
4-2. Impulse Bandwidth Accuracy . . . . . . . . . . . . 4-8
4-3. 6 dB Resolution Bandwidth Accuracy . . . . . . . . 4-9
4-4. 6 dB Resolution Bandwidth Selectivity . . . . . . . . 4-12
4-5. Impulse and Resolution Bandwidth Selectivity . . . . 4-15
4-6. Bandwidth Switching Uncertainty . . . . . . . . . . 4-17
5-l. Log Amplitude Fidelity (10 Hz RBW; Option 857) . . . 5-4
5-2. Log Amplitude Fidelity (10 kHz RBW; Option 857) . . 5-5
5-3. Linear Amplitude Fidelity . . . . . . _ . . . . . . . 5-6
Contents-E
1
General Information
Introduction This HP 8568B Tests and Adjustments Manual contains two sections:
Performance Tests and Adjustments Procedures. The Performance
Tests provided should be performed for the following reasons:
w If the test equipment for the Operation Verification Program is not
available.
n If the instrument does not pass all of the Operation Verification
tests.
w For complete verification of specifications not covered by the
Operation Verification program.
The adjustment procedures should be performed for the following
reasons:
w If the results of a performance test are not within the specifications.
w After the replacement of a part or component that affects electrical
performance.
Warning The adjustment procedures require access to the interior of the
instrument and therefore should only be performed by qualified
service personnel. There are voltages at many points in the
instrument which can, if contacted, cause personal injury. Be
extremely careful. Adjustments should be performed only by
trained service personnel.
Power is still applied to this instrument with the LINE switch in
STANDBY. There is no OFF position on the LINE switch. Before
removing or installing any assembly or printed circuit board,
remove the power cord from the rear of both instruments and
wait for the MAINS indicators (red LEDs) to go completely out.
Capacitors inside the instrument may still be charged even if the
instrument has been disconnected from its source of power.
Use a non-metallic tuning tool whenever possible.
Instruments Covered This manual contains procedures for testing and adjusting HP 8568B
by this Manual Spectrum Analyzers, including those with Option 001 (75 Ohm RF
INPUT), Option 400 (400 Hz operation), Option 462, and Option 857
installed. The procedures in this manual can also be used to adjust HP
8568A Spectrum Analyzers that have been converted into HP 8568B
Spectrum Analyzers through the installation of an HP 8568AB Retrofit
Kit (formerly HP 8568A+ OlK Retrofit Kit).
G e n e r a l I n f o r m a t i o n l-1
Operation Verification A high confidence level in the instrument's operation can be achieved
by running only the Operation Verification Program, since it tests
most of the instrument's specifications. It is recommended that the
Operation Verification Program be used for incoming inspection and
after repairs, since it requires much less time and test equipment.
A description of the program can be found in the Installation and
Verification manual.
Option 462 Option 462 instruments require that the performance tests and
Instruments adjustment procedures listed below be performed instead of their
standard versions included in chapters two and three. Information on
Option 462 versions are located in Chapter 4, Option 462.
6 dB Bandwidths:
Test 4, 6 dB Resolution Bandwidth Accuracy Test
Test 5, 6 dB Resolution Selectivity Test
Adjustment 9, 6 dB Bandwidth Adjustments
Impulse Bandwidths:
Test 4, Impulse and Resolution Bandwidth Accuracy Test
Test 5, Impulse and Resolution Selectivity Test
Test 6, Impulse and Resolution Bandwidth Switching Uncertainty
Test
Adjustment 9, Impulse Bandwidth Adjustments
Option 857 Option 857 instruments require that the performance test procedure
Instruments listed below be performed instead of the standard version included in
Chapter 2. Information on Option 857 is located in Chapter 5, Option
857.
Test 12, Option 857 Amplitude Fidelity Test
l-2 G e n e r a l I n f o r m a t i o n
`Ihble l-l. Recommended Test Equipment (1 of 5)
Instrument Critical Specifications for Zecommended Perf. 4dj.
Equipment Substitution Model Test
SIGNAL
SOURCES
Synthesized Frequency: 10 MHz to 1500 MHz HP 8340A X
Sweeper Output Power: + 10 dBm maximum (leveled)
Aging Rate: ~1 x 10mg/day
Spurious Signals: 135 dBc (~7 GHz)
125 dBc (<20 GHz)
Amplitude Modulation: dc to 100 kHz
Leveling: Internal, External Power Meter
Signal Frequency: 20 MHz to 450 MHz HP 8640B X
Generator SSB Phase Noise: >130 dB below carrier at
20 kHz away
Stability: ~10 ppm/lO min.
(HP 8340A may be substituted)
Frequency Frequency: 200 Hz to 80 MHz HP 3335A X X
Synthesizer Stability: f 1 x lo-`/day
Amplitude Range: + 13 to -86 dBm with 0.01 dB
resolution
Attenuator Accuracy: < f0.07 dB (+ 13 to -47 dBm)
Pulse Pulse Width: 10 nsec to 250 nsec HP 8116A X
Generator Rise and Fall Times: ~6 nsec
Output Level: + 2.5V
Function Output: Sine Wave and Triangle Wave, 2Vp-p HP 3312A X X
Generator Range: 100 Hz to 500 kHz (Sweep Function Available)
Frequency Output: 1, 2, 5, or 10 MHz HP 5061B X X
Standard Accuracy: lO MHz HP 5345A X
Counter Resolution: 2 x lo-' gate time
Ext. Time Base: 1, 2, 5, or 10 MHz
j = Universal Frequency: dc to 100 MHz HP 5316B X
Counter Time Interval A + B: 100 nsec to 200 set
Sensitivity: 50 mV rms
Range: 30 mV to 5V p-p
OSCILLOSCOPE
Oscilloscope Digitizing OSCOPE, 4 Channel HP 54501A
Frequency: 100 MHz
Sensitivity: .005V/Division
Probe 10: 1 Divider, compatible with oscilloscope HP 10432A
l-4 G e n e r a l I n f o r m a t i o n
`Ihble l-l. Recommended Test Equipment (4 of 5)
Instrument Critical Specifications for Recommended Perf. 1dj.
Equipment Substitution Model Test
ATTENUATORS
(Cont'd)
20 dB ?requency: 200 Hz to 18 GHz HP 8491B,
Attenuator rype N Connectors Option 020
TERMINATIONS
Termination Impedance: 500; BNC HP 11593A X
FIWERS
Low-Pass ?latness: ho.25 dB Telonic
Filter Cut-off Frequency:2400 MHz and ~500 MHz TLS450-7EE
Xejection: >40 dB at 1750 MHz
Low-Pass ht.-off Frequency: 300 MHz HP 0955-0455 X
Filter
Low-Pass Cut-off Frequency: 50 MHz HP 0955-0306 X
Filter
MISCELLANEOUS
DEVICES
Power Frequency: 1 MHz to 1500 MHz HP 11667A X X
Splitter backing: ~0.2 dB
Directional HP 8721A X
Bridge
SPECIAL
DEVICES
Display Required for preliminary display adjustments HP85662-60088 X
Adjustment
PC Board
Low-Noise Zefer to Figure 70 X
DC Supply (Optional)
Crystal Filter Xefer to Figure 71 X
Bypass Network
(4 required)
l-6 G e n e r a l I n f o r m a t i o n
`Ihble l-l. Recommended Test Equipment (5 of 5)
Instrument Critical Specifications for Recommended Perf. Adj a
Equipment Substitution Model Test
CABLES
Cable Assembly Frequency Range: 200 Hz to 22 GHz HP 8120-4921 X X
APC 3.5 Male Connectors
Length: 91 cm (36 inches)
SWR: cl.4 at 22 GHz
Cable BNC, 122 cm (48 in.) (3 required) 10503A x x
Test Cable * BNC (m) to SMB Snap-On (f) HP 85680-60093 X
Test Cable SMA (m) to SMA (m) HP 85680-20094 X
Test Cable SMA (m) to SMA (m) HP5061-5458 X X
ADAPTERS
Adapter Type N (f) to BNC (m) HP1250-0077 X
Adapter Type N (m) to BNC (m) HP1250-0082 X
Adapter Tee, SMB Male Connectors HP 1250-0670 X
Adapter Type N (m) to N (m) HP1250-0778 X
Adapter Type N (m) to BNC (f)(2 required) HP1250-0780 X
Adapter BNC Tee (m) (f) (f) HP1250-0781 X
Adapter Type N (m) to SMA (f) HP1250-1250 X
Adapter Type N (f) to BNC (f)(2 required) HP1250-1474 X
Adapter APC-3.5 (f) to APC-3.5 (f) HP1250-1749 X
Adapter APC-3.5 (f) TO N (f)(2 required) HP 1250-1745
BOARD
EXTENDERS
Extender * PC Board: 36 contacts; HP 08505-60042 X
12 required) 2 rows of 18
Extender * PC Board: 30 contacts; HP 08505-60041 X
13 required) 2 rows of 15
Extender * PC Board: 20 contacts; HP 85680-60028 X
2 rows of 10
Extender * PC Board: 12 contacts; HP08505-60109 X
12 required) 2 rows of 6
PC Board PC Board extracting tool HP 03950-4001 ,X
Extractor
* Part of Service Accessories
G e n e r a l I n f o r m a t i o n l-7
Description HP Part Number
Extender Board: 20 contacts; 2 rows of 10 85680-60028
Cable: 4-foot long; BNC to SMB snap-on 85680-60093
PC Board: Display Adjustment Test 85662-60088
Extender Board: 30 contacts; 2 rows of 15 08505-60041
Extender Board: 12 contacts; 2 rows of 6 08505-60109
Extender Board: 50 contacts; 2 rows of 25 85680-60034
Extender Board: 36 contacts; 2 rows of 18 08505-60042
Figure l-l. Service Accessories, HP Part Number 08568-60001
l-8 G e n e r a l I n f o r m a t i o n
2
Performance Tksts
Introduction The procedures in this section test the instrument's electrical
performance using the Specifications in the Installation and
Verification Manual as the performance standards. None of the
tests require access to the interior of the instrument. The manual
Performance Tests provided in this section should be performed only
if semi-automatic test equipment (for Operation Verification) is not
available or the Performance Test is not in the Operation Verification
Program. (Refer to the Installation and Verification Manual for
information on Operation Verification.)
Verification of When a complete verification of specifications is required, proceed as
Specifications follows:
1. Run the Operation Verification Program.
2. The Operation Verification Program verifies compliance with
specifications of all tests it performs. The tests not performed by
the Operation Verification Program must be done manually and are
as follows:
n Center Frequency Readout Accuracy
n Spurious Responses
H Fast Sweep Time Accuracy
n 1st LO Output Amplitude Responses
n Frequency Reference Error
If the results of a performance test are marginally within
specification, go to the Adjustments section of this manual and
perform the related adjustment procedures. When an adjustment is
directly related to a performance test, the adjustment procedure is
referenced under RELATED ADJUSTMENT in the performance test.
Calibration Cycle This instrument requires periodic verification of performance. The
instrument should have a complete verification of specifications at
least every six months.
P e r f o r m a n c e T e s t s 2-l
Equipment Required Equipment required for the manual performance tests and
adjustments is listed in `Ihble 2-1, Recommended Test Equipment,
at the beginning of this manual. Any equipment that satisfies the
critical specifications given in the list may be substituted for the
recommended model.
Test Record The Operation Verification Program provides a detailed test record
when a printer is used with the controller. If manual performance
tests are done, results of the performance tests may be tabulated in
the HP 8568B Performance Test Record at the end of this section. The
HP 8568B Performance Test Record lists all of the tested specifications
and the acceptable ranges for the measurement values obtained
during the tests.
Note Allow l/2-hour warm-up time for the HP 8568B before beginning the
Performance Tests.
able 2-1. Performance Test Cross-Reference
Function or Characteristic Tested Test Performance Test
No.
Center Frequency Readout 1 Center Frequency Readout Accuracy Test
Frequency Spans 2 Frequency Span Accuracy Test
Sweep Time Accuracy (220 ms) 3 Sweep Time Accuracy Test
3-dB Bandwidths 4 Resolution Bandwidth Accuracy Test
Bandwidth Shape 5 Resolution Bandwidth Selectivity Test
Bandwidth Amplitudes 6 Resolution Bandwidth Switching Uncertainty Test
Input Attenuator Accuracay 7 Input Attenuator Switching Uncertainty
Frequency Response 8 Frequency Response Test
RF Gains 9 RF Gain Uncertainty Test
IF Gains 10 IF Gain Uncertainty Test
Log Scales Accuracy 11 Log Scale Switching Uncertainty Test
Log and Linear Amplifier Fidelity 12 Amplitude Fidelity Test
Noise Floor 13 Average Noise Level Test
Residual Responses 14 Residual Responses Test
Spurious Responses 15 Spurious Responses Test
Residual FM 16 Residual FM Test
Line-Related Sidebands 17 Line-Related Sidebands Test
CAL OUTPUT Level 18 Calibrator Amplitude Accuracy Test
Fast Sweep Times 19 Fast Sweep Time Accuracy Test
1ST LO OUTPUT Amplitude 20 1ST LO OUTPUT Amplitude Test
Frequency Reference 21 Frequency Reference Error Test
2-2 Performance Tests
1. Center Frequency Readout Accuracy Test
1. Center
Frequency Readout
Accuracy `I&t
Related Adjustments Frequency Control Adjustments
Time Base Adjustment
Step Gain and 18.4 MHz Local Oscillator Adjustments
50 MHz Voltage-Tuned Oscillator Adjustments
Specification (uncorrected)
f2% of frequency span + frequency reference error x tune frequency
+30% of resolution bandwidth setting + 10 Hz) in AUTO resolution
bandwidth after adjusting FREQ ZERO at stabilized temperature.
Description A synthesized signal source that is phase-locked to a known frequency
standard is used to input a signal to the analyzer. The frequency
readout of the analyzer is compared to the actual input frequency
for several different frequency settings over the analyzer's range.
The signal source is phase-locked to a standard known to be as
accurate as the analyzer's internal frequency reference to minimize
the "frequency reference error x center frequency" term of the
specification.
FAEQUENCY
SPECTRUH ANALYZER STANDARD
SYNTHESIZED
SHEEPER
SIONAL
INPUT 2
ADAPTER
CABLE ASSENBLY
Figure 2-1. Center Frequency Accuracy Test Setup
P e r f o r m a n c e T e s t s 2-3
1. Center Frequency Readout Accuracy Test
Equipment Synthesized Sweeper . . . . . . . . . HP8340A
Frequency Standard . 10 MHz standard, accy within + 1 part in lOlo,
e.g. HP 5061A
Adapter, Type N (m) to SMA (f) . . . HP1250-1250
61 cm (24 in.) Cable Assembly, SMA Male Connectors HP 5061-1086
Procedure 1. Connect CAL OUTPUT to SIGNAL INPUT 2.
2 . Press [INSTR PRESET), @ on the analyzer.
3 . Adjust FREQ ZERO for a maximum amplitude trace.
4 . Press (1tds-r~ PRESET).
5 . Set the synthesized sweeper for a 100.000 MHz signal at a level of
approximately 0 dBm.
6 . Connect equipment as shown in Figure 2-l.
7 . Set analyzer ~CENTER FREQUENCY ) and [ FREQUENCY SPAN ) and
synthesized sweeper frequency according to Table 2-2. At each
setting, press [PEAK SEARCH).~~) to center the signal. Adjust
CREFERENCE LEVEL) as necessary to place signal peak at a convenient
level.
8. Record the CENTER readout frequency in the table for each
setting. The limits for this frequency are given in the table. See
Figure 2-2.
Figure 2-2. Center Frequency Readout Error Measurement
2-4 Performance Tests
1. Center Frequency Readout Accuracy Test
Note Spectrum analyzer center frequency readout can fall outside of
specified limits if 10 MHz frequency reference has not been calibrated
within the past year. To eliminate "frequency reference error x
tune frequency" term, substitute spectrum analyzer 10 MHz FREQ
REFERENCE rear panel output for frequency standard and repeat
test.
`Ihble 2-2. Center Frequency Readout Error Test Record
Spectrum Analyzer
I
[FREQUENCYSPAN)I(CENTER FREQumcy~ Center Readout
(MHz)
\ I \
(MHZ)
I
Min Measured Max
100 MHz 100 98 102
100 MHz 500 498 502
100 MHz 1000 998 1002
10 MHz 100 99.8 100.2
10 MHz 500 499.8 500.2
10 MHz 1000 999.8 1000.2
10 MHz 1500 1499.8 1500.2
1 MHz 1000 999.98 1000.02
100 kHz 1000 999.998 1000.002
10 kHz 1000 999.9998 1000.0002
Performance Tests 2-5
2. Frequency Span
Accuracy lkst
Related Adjustments Frequency Control Adjustments
50 MHz Voltage-Tuned Oscillator Adjustments
Specification
Span Uncertainty
>l MHz f(2% of the actual frequency
separation between two points +0.5%
of span setting)
51 MHz 445% of the actual frequency
separation between two points +0.5%
of span setting)
Description Frequency Span accuracy is determined by measuring a frequency at
5% of sweep and then at 95% of sweep. These frequencies correspond
to half a division from each edge of the CRT.
The spans chosen are based on the architecture of the HP 8568B RF
hardware:
Span Assembly Being Swept
200 Hz VT0 Oscillator (low divide)
100 kHz VT0 Oscillator (low divide)
100.1 kHz VT0 Oscillator (high divide)
1 MHz VT0 Oscillator (high divide)
1.01 MHz FM Coil of Yig Oscillator
20 MHz FM Coil of Yig Oscillator
20.1 MHz Main Coil of Yig Oscillator
1.5 GHz Main Coil of Yig Oscillator
SYNTHESIZED WEEPER
Figure 2-3. Frequency Span Accuracy Test Setup
2-6 P e r f o r m a n c e T e s t s
2. Frequency Span Accuracy Test
Equipment Synthesized Sweeper ..................................................................... 83640A
AdapterTypeN(m) to SMA(f).................................................1250-1250
Cable;SMAconnectors....................................................................
.5061-5458
Cable; BNC122cm(48in)............................................................HP10503A
Procedure 1. Connect equipment as shown in Figure 2-3.
2. Press QNsTR PRESET] on analyzer.
3. Press [CENTER FREQ UENCY ] 100 MHz, [ FREQUENCY SPAN_) 200 Hz.
4. Connect synthesized sweeper tot spectrum analyzer RF input 2.
5. On synthesized sweeper, select external REFERENCE and key in
(jj' 0 dBm.
6. Press Icw] and key in 99.999 910 MHz.
7. Press MARKER [PEAK SEARCH) on spectrum analyzer and record
marker reading under FREQ C of Table 2-3.
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