HP 85640A Operation manual

Printed in USA July 2004
Notice
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 name/number was HP XXXX the current name/number is now Agilent XXXX. For
example, model number HP 8648 is now model number Agilent 8648.
Contacting Agilent Sales and Service Offices
The sales and service contact information in this manual may be out of date. The latest
service and contact information for your location can be found on the Web at:
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If you do not have access to the Internet, contact your field engineer. In any correspondence
or telephone conversation, refer to your instrument by its model number and full serial
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HP 85640A
RF Tracking Generator
Operation and Service Manual
ABCDE
Printed in USA
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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.
HP part number: 85640-90005
Printed July 1992
This manual applies to HP 85640A RF tracking generators with serial numbers prexed 2918A
and below.
c
 Copyright Hewlett-Packard Company 1989, 1992.
All Rights Reserved. Reproduction, adaptation, or translation without prior written permission
is prohibited, except as allowed under the copyright laws
.
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Certication
Hewlett-Packard Company certies that this product met its published specications at the
time of shipment from the factory. Hewlett-Packard further certies 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
HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the
product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products
returned to HP from another country.
HP warrants that its software and rmware designated by HP for use with an instrument will
execute its programming instructions when properly installed on that instrument. HP does not
warrant that the operation of the instrument, or software
, or rmware will be uninterrupted or
error- free.
Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modication or
misuse, operation outside of the environmental specications for the product, or improper
site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
Exclusive Remedies
THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES.
HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER
LEGAL THEORY.
Assistance
Product maintenance agreements and other customer assistance agreements are available for
Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Oce.
iii
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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.
iv
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Contents
1. General Information
What You'll Find in This Operation and Service Manual . . . .......... 1-1
What You'll Find in This Chapter ....................... 1-1
Quick Overview of the HP 85640A RF Tracking Generator .. .. .. .. .. . 1-2
Accessories Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
RF Tracking Generators Covered by This Manual ............... 1-4
Serial Numbers .. .. .. .. .. .. .. .. .. .. .. .. .. . .. . 1-4
Calibration Cycle .............................. 1-4
Specications and Characteristics . . . . . . . . . . . . . . . . . . . . . . . 1-5
Table 1-1. HP 85640A Specications ..................... 1-6
Frequency Specications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Amplitude Specications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Electromagnetic Specications .. .. .. .. .. .. .. .. .. .. .. . 1-8
General Specications .. .. .. .. .. .. .. .. .. .. .. .. .. . 1-9
Physical and Mechanical Specications ................... 1-10
Table 1-2. HP 85640A Characteristics . . . . . . . . . . . . . . . . . . . . . 1-11
Frequency Characteristics ......................... 1-11
Amplitude Characteristics .. .. .. .. .. .. .. .. . .. .. .. .. 1-11
Inputs and Outputs .. .. .. .. .. .. .. .. .. .. .. .. .. .. 1-12
2. Installation
What You'll Find in This Chapter . . . ..................... 2-1
Compatibility with Portable Spectrum Analyzers . . . . . . . . . . . . . . . . 2-1
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Is the Shipment Complete? . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Is the Shipping Container in Good Condition? ................ 2-2
Save the Packaging Materials . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Preparing the RF Tracking Generator for Use ................. 2-2
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Setting the Line-Voltage Selector Switch . . . . . . . . . . . . . . . . . . . 2-4
Checking the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Power Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Connecting an HP 85640A to a Compatible Spectrum Analyzer .... .. .. . 2-7
Turning On the Tracking Generator . . . . . . . . . . . . . . . . . . . . . . 2-8
Sales and Service Oces . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
3. Operation
What You'll Find in This Chapter . . . ..................... 3-1
Front-Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Rear-Panel Features ............................. 3-4
HP 85640A and Host Spectrum Analyzer Connections ............. 3-5
Measurement Overview .... .. .. .. .. .. .. .. .. .. .. .. . 3-7
Making a Stimulus-Response Measurement .. .. .. .. .. .. .. .. . 3-7
Equipment Needed ............................ 3-8
Transmission Measurements .... .. .. .. .. .. .. .. .. .. .. . 3-9
HP 85640A RF Tracking Generator Operation and Service Manual Contents-1
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Making a Transmission Measurement Using an HP 8560A/E, HP 8561B/E, or
HP 8563A/E Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . 3-9
Set up the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Calibrate. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3-15
Normalize................................. 3-17
Measure. ................................ 3-18
Making a Transmission Measurement Using an HP 8561A or HP 8562A/B
Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Set up the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Calibrate. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3-26
Normalize................................. 3-27
Measure. ................................ 3-28
Reection Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Making a Reection Measurement Using an HP 8560A/E, HP 8561B/E, or
HP 8563A/E Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . 3-30
Set up the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Calibrate. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3-30
Normalize................................. 3-35
Measure. ................................ 3-36
Making a Reection Measurement Using an HP 8561A or HP 8562A/B
Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Set up the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Calibrate. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3-38
Normalize................................. 3-40
Measure. ................................ 3-40
4. Performance Tests
What You'll Find in This Chapter . . . .... .. .. .. .. .. .. .. .. . 4-1
What is Performance Verication? ...................... 4-1
Before Beginning .............................. 4-3
Test Equipment You'll Need ........................ 4-3
Recording Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
1. Output Attenuator Accuracy . . . . . . . . . . . . . . . . . . . . . . 4-6
2. Maximum Leveled Output Power . . . . . . . . . . . . . . . . . . . . 4-9
3. Level Flatness ............................ 4-12
4. Harmonic Spurious Outputs ...................... 4-16
5. Non-Harmonic Spurious Outputs . . . . . . . . . . . . . . . . . . . . 4-19
6. LO Feedthrough Amplitude .... .. .. .. .. .. .. .. .. .. 4-25
7. Tracking Generator Feedthrough . . . . . . . . . . . . . . . . . . . . 4-28
8. Frequency Tracking Range ...................... 4-32
5. Adjustment Procedures
What You'll Find in This Chapter . . . .... .. .. .. .. .. .. .. .. . 5-1
Safety Considerations ............................ 5-1
Which Adjustment Should Be Performed? . . . . . . . . . . . . . . . . . . 5-1
Test Equipment .............................. 5-1
Adjustable and Factory-Selected Components .. .. .. .. .. .. .. .. 5-2
Adjustment Tools ............................. 5-2
1. Power Supply Adjustments and Checks . . . . . . . . . . . . . . . . . 5-4
2. 600 MHz Level Adjustment ...................... 5-7
3. Power Level Adjustments ....................... 5-12
4. Tracking Oscillator Range Adjustments . . . . . . . . . . . . . . . . . 5-15
Fine Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Coarse Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Contents-2 HP 85640A RF Tracking Generator Operation and Service Manual
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6. Assembly Replaceable Parts
What You'll Find in This Chapter ....................... 6-1
Major Assembly and Cable Locations .................... 6-2
Mechanical Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . 6-4
7. Service Information
What You'll Find in This Chapter . . . ..................... 7-1
Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
PC Board Assemblies and Electronic Components .............. 7-2
Returning the RF Tracking Generator for Service .. .. .. .. .. . .. .. 7-4
Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Rebuilt Exchange Assemblies . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Removing and Replacing the Instrument Cover .. .. .. .. .. .. .. .. 7-7
Removal ................................. 7-7
Replacement ............................... 7-7
A1 Attenuator Replacement .. .. .. .. .. .. .. .. .. .. .. .. . 7-8
Removal ................................. 7-8
Replacement ............................... 7-8
A2 Tracking Generator Assembly Replacement .... .. .. .. .. .. .. 7-10
Removal ................................. 7-10
Replacement ............................... 7-10
A3 Interface Board Assembly Replacement .... .. .. .. .. .. .. .. 7-12
Removal ................................. 7-12
Replacement ............................... 7-12
A4 Power Supply Replacement . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Removal ................................. 7-14
Replacement ............................... 7-14
A5 Line Filter/Switch Assembly Replacement ................. 7-16
Removal ................................. 7-16
Replacement ............................... 7-16
HP 85640A RF Tracking Generator Circuit Descriptions and Troubleshooting
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
HP 85640A Block Diagram Circuit Descriptions ............... 7-18
Troubleshooting the HP 85640A RF Tracking Generator Circuits ........ 7-21
A1 Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
A2 Tracking Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
A3 Interface Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22
A4 Power Supply ............................. 7-23
A5 Line Filter/Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . 7-23
Troubleshooting Tracking Generator-Related Faults .. .. .. .. . .. .. . 7-24
Output Unleveled ............................. 7-24
Excessive Residual FM . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26
Flatness Out of Tolerance ......................... 7-27
Harmonic/Spurious Outputs Too High .................... 7-28
No Output Power ............................. 7-30
Index
HP 85640A RF Tracking Generator Operation and Service Manual Contents-3
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Figures
1-1. HP 85640A with Accessories Supplied . . . . . . . . . . . . . . . . . . . . 1-3
1-2. An Example of a Serial Number Label . . . . . . . . . . . . . . . . . . . . 1-4
2-1. Voltage Selection Switch and Line Fuse Locations .............. 2-4
2-2. ACPower Cables Available . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2-3. Front-Panel Cable Connections ....................... 2-7
2-4. Rear-Panel Cable Connections .. .. .. .. .. .. .. .. .. .. . .. 2-8
3-1. Front-Panel Feature Overview ....................... 3-3
3-2. HP 85640A Rear-Panel Feature Overview .................. 3-4
3-3. Tracking Generator-to-Host Analyzer Front-Panel Connections .. .. .. .. 3-5
3-4. Tracking Generator-to-Host Analyzer Rear-Panel Connections . . . . . . . . . 3-6
3-5. Host Spectrum Analyzer and Tracking Generator System Block Diagram . . . . 3-7
3-6. Tracking Generator Power over Specied Frequency Range . . . . . . . . . . 3-10
3-7. Display of DUT Response . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3-8. System Setup for Transmission Measurement ................ 3-11
3-9. Faster Sweep Times in Stimulus-Response Auto-Coupled Mode .. .. .. .. 3-12
3-10. Adjusting the Spectrum Analyzer for Measurement Requirements . . . . . . . 3-12
3-11. Decrease Resolution Bandwidth to Improve Sensitivity . . . . . . . . . . . . 3-13
3-12. Using Tracking Adjust to Compensate for Tracking Error . . . . . . . . . . . 3-13
3-13. Tracking Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3-14. Guided Calibration Prompt . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3-15. Thru Connected for Guided Calibration Routines . . . . . . . . . . . . . . . 3-16
3-16. Display of Thru-Reference Trace in Trace B . . . . . . . . . . . . . . . . . 3-17
3-17. Normalized Trace ............................. 3-18
3-18. Measuring Rejection Range with Delta Markers .. .. .. .. .. .. .. . 3-18
3-19.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NORM REF LVL Adjusts the Trace and Retains Analyzer Settings .... .. . 3-19
3-20.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RANGE LVL Increases Dynamic Measurement Range . . . . . . . . . . . . . 3-19
3-21. Tracking Generator Power over Specied Frequency Range . . . . . . . . . . 3-21
3-22. System Setup for Transmission Measurement ................ 3-22
3-23. Display of DUT Response . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
3-24. Adjusting the Spectrum Analyzer for Measurement Requirements . . . . . . . 3-23
3-25. Decrease Resolution Bandwidth to Improve Sensitivity . . . . . . . . . . . . 3-24
3-26. Using TRACKING ADJUST to Compensate for Tracking Error . . . . . . . . . 3-24
3-27. Tracking Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-28. Thru Connected for Calibration Routine . . . . . . . . . . . . . . . . . . . 3-26
3-29. Display of Thru-Reference Trace in Trace B . . . . . . . . . . . . . . . . . 3-27
3-30. Normalized Trace ............................. 3-28
3-31. Measuring Rejection Range with Delta Markers .. .. .. .. .. .. .. . 3-28
3-32. Increased Dynamic Measurement Range . . . . . . . . . . . . . . . . . . . 3-29
3-33. System Setup for a Reection Measurement . . . . . . . . . . . . . . . . . 3-31
3-34. Display with System Congured for a Reection Measurement ........ 3-31
3-35. Spectrum Analyzer Display of Bandpass Filter Region ............ 3-32
3-36. On-Screen Prompts to Connect an Open . . . . . . . . . . . . . . . . . . . 3-33
3-37. Connect the Open ............................. 3-33
3-38. On-Screen Prompts to Connect an Short . . . . . . . . . . . . . . . . . . . 3-34
3-39. Connect the Short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34
Contents-4 HP 85640A RF Tracking Generator Operation and Service Manual
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3-40. Normalized Return Loss Measurement . . . . . . . . . . . . . . . . . . . . 3-35
3-41. Return Loss Reading Using the 4
MKR
5 Function . . . . . . . . . . . . . . . . 3-36
3-42. Display with the System Congured for a Reection Measurement ...... 3-38
3-43. System Setup for a Reection Measurement . . . . . . . . . . . . . . . . . 3-38
3-44. Spectrum Analyzer Display of Bandpass Filter Region .... .. .. .. .. 3-39
3-45. Return Loss Reading Using the 4
MKR
5 Function . . . . . . . . . . . . . . . . 3-40
4-1. HP 85640A RF Tracking Generator Connections ............... 4-3
4-2. Output Attenuator Accuracy Test Setup . . . . . . . . . . . . . . . . . . . 4-6
4-3. Maximum Leveled Output Power Test Setup . . . . . . . . . . . . . . . . . 4-9
4-4. Level Flatness Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4-5. Harmonic Spurious Outputs Test Setup .... .. .. .. .. .. .. .. . 4-16
4-6. Non-Harmonic Spurious Outputs Test Setup ................. 4-20
4-7. LO Feedthrough Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
4-8. Tracking Generator Feedthrough Test Setup . . . . . . . . . . . . . . . . . 4-28
4-9. Frequency Tracking Range Test Setup . . . . . . . . . . . . . . . . . . . . 4-32
5-1. Power Supply Adjustments and Checks Setup ................ 5-4
5-2. Power Supply Adjustments and Test Point Locations ............. 5-5
5-3. 600 MHz Level Adjustment Setup . . . . . . . . . . . . . . . . . . . . . . 5-7
5-4. Attenuator A3U4 Location . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5-5. Power Level Adjustment Setup . . . . . . . . . . . . . . . . . . . . . . . 5-12
5-6. Power Level Adjustment and Test Point Locations .............. 5-13
5-7. Tracking Oscillator Range Adjustment . . . . . . . . . . . . . . . . . . . . 5-15
5-8. Tracking Oscillator Range Adjustment Locations . . . . . . . . . . . . . . . 5-16
6-1. Major Assemblies and Cable Locations ................... 6-3
6-2. Mechanical Replaceable Parts (1 of 2) . . . . . . . . . . . . . . . . . . . . 6-4
6-3. Mechanical Replaceable Parts (2 of 2) . . . . . . . . . . . . . . . . . . . . 6-6
7-1. A Static-Safe Workstation ......................... 7-2
7-2. HP 85640A Shipping Container and Cushioning Materials . . . . . . . . . . . 7-5
7-3. A1 Attenuator Replacement ........................ 7-9
7-4. A2 Tracking Generator Assembly Replacement ............... 7-11
7-5. A3 Interface Board Assembly Replacement ................. 7-13
7-6. A4 Power Supply Replacement . . . . . . . . . . . . . . . . . . . . . . . 7-15
7-7. A5 FL1 Line Filter Module Replacement . . . . . . . . . . . . . . . . . . . 7-17
7-8. Simplied HP 85640A to Host Spectrum Analyzer System Block Diagram ... 7-19
7-9. Simplied HP 85640A RF Tracking Generator Block Diagram . . . . . . . . . 7-20
HP 85640A RF Tracking Generator Operation and Service Manual Contents-5
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Tables
2-1. Host Spectrum Analyzer-to-Tracking Generator Compatibility . . . . . . . . . 2-1
2-2. Operating Power Requirements . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-3. Hewlett-Packard Sales and Service Oces . . . . . . . . . . . . . . . . . . 2-10
3-1. Front-Panel Interconnections . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-2. Rear-Panel Interconnections ........................ 3-4
3-3. HP 85640A and Host Spectrum Analyzer Connections ............ 3-5
4-1. Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-2. Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-3. Output Attenuator Accuracy ........................ 4-8
4-4. Flatness Relative to 300 MHz . . . . . . . . . . . . . . . . . . . . . . . . 4-15
4-5. Harmonic Spurious Outputs ........................ 4-18
4-6. Fundamental Response Amplitudes . . . . . . . . . . . . . . . . . . . . . 4-23
4-7. Non-Harmonic Spurious Responses ..................... 4-24
4-8. Tracking Generator Feedthrough ...................... 4-31
4-9. Performance Test Record (Page 1 of 3) .. .. .. .. .. .. .. . .. .. 4-35
4-9. Performance Test Record (Page 2 of 3) .. .. .. .. .. .. .. . .. .. 4-36
4-9. Performance Test Record (Page 3 of 3) .. .. .. .. .. .. .. . .. .. 4-37
5-1. Adjustment Procedures and Equipment Used .. .. .. .. .. .. .. .. 5-2
5-2. Post-Repair or Specication Failure Adjustment List ............. 5-3
5-3. Adjustable Components .. .. .. .. .. .. .. . .. .. .. .. .. . 5-3
5-4. Factory Selectable Component ....................... 5-3
5-5. Attenuation Values of Pad A3U4 ...................... 5-10
5-6. Harmonic and Subharmonic Levels ..................... 5-11
5-7. Tracking Oscillator Range Centering . . . . . . . . . . . . . . . . . . . . . 5-18
6-1. Part Numbers for Figure 6-2 ........................ 6-4
7-1. Static-Safe Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Contents-6 HP 85640A RF Tracking Generator Operation and Service Manual
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1
General Information
What You'll Find in This Operation and Service Manual ...
Chapter 1, \General Information," gives specications and characteristics for the instrument.
Chapter 2, \Installation," discusses power requirements, spectrum analyzer compatibility, and
interconnect requirements, and gives a list of HP sales and service oces.
Chapter 3, \Operation," explains the use of front- and rear-panel features and gives the
steps for transmission and reection measurements using the tracking generator with a host
spectrum analyzer.
Chapter 4, \Performance Tests," describes the tests you'll use to verify the electrical
performance of the tracking generator
.
Chapter 5, \Adjustment Procedures," provides steps to adjust assemblies of the tracking
generator.
Chapter 6, \Assembly Replaceable Parts," shows the replaceable parts of the tracking
generator.
Chapter 7, \Service Information," describes replacement procedures, suggests methods for
troubleshooting, and explains how to return the instrument for service or repair
. In this
chapter you'll also nd lists of component-level replaceable parts
, instrument block diagrams,
and schematic and component location diagrams for the A3 interface assembly
.
What You'll Find in This Chapter
This chapter introduces you to the HP 85640A RF tracking generator. Figure 1-1 shows the
accessories supplied with the instrument at shipment; Table 1-1, \HP 85640 Specications" and
Table 1-2, \HP 85640 Characteristics," describe the instrument's performance under specied
conditions.
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Quick Overview of the HP 85640A RF Tracking Generator
The HP 85640A RF tracking generator provides a tracking source covering the 300 kHz to
2.9 GHz frequency range. It is compatible with HP 8560A/E, HP 8561A/B/E, HP 8562A/B, and
HP 8563A/E spectrum analyzers.
A 70 dB step attenuator combined with an 11 dB vernier provide continuously variable output
power levels from 0 dBm to 0 80 dBm. The tracking generator's output frequency is controlled
by the spectrum analyzer. The front-panel tracking control enables the tracking generator's
output frequency to be matched exactly to the spectrum analyzer input frequency, minimizing
tracking errors. Tracking errors appear as a decrease in the displayed signal amplitude when
the resolution bandwidth of the spectrum analyzer signal is decreased.
The HP 85640A can be leveled externally with a negative-polarity detector improving eective
source match. A rear-panel switch selects between internal and external leveling.
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Accessories Supplied
Accessories (some not shown) HP Part Number
3 cables with BNC(m) connectors 8120-1839
1 cable with SMA(m) connectors 5061-9038
2 fuses, 1A 250V UL/CSA (for 100/120V operation) 2110-0823
or
2 fuses, 0.5A 250V IEC (for 220/240V operation) 210-0824
Figure 1-1. HP 85640A with Accessories Supplied
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RF Tracking Generators Covered by This Manual
This manual applies to tracking generators with the serial number prexes listed inside the title
page.
Serial Numbers
Hewlett-Packard makes frequent improvements to its products to enhance their performance,
usability, or reliability. Hewlett-Packard service personnel have access to complete records of
design changes to each type of equipment, based on the equipment's serial number. Whenever
you contact Hewlett-Packard about your tracking generator, have the complete serial number
available to ensure obtaining the most complete and accurate information possible.
The serial number label is attached to the rear of the tracking generator. The serial number has
two parts: a prex (the rst four numbers and a letter), and a sux (the last ve numbers).
See Figure 1-2.
The rst four numbers of the prex are a code identifying the date of the last major design
change incorporated in your analyzer. The letter identies the country in which the unit
was manufactured. The ve-digit sux is a sequential number and is dierent for each unit.
Whenever you list the serial number or refer to it in obtaining information about your tracking
generator, be sure to use the complete number, including the full prex and the sux.
Figure 1-2. An Example of a Serial Number Label
Calibration Cycle
The performance tests located in Chapter 4, \Performance Tests," should be used every 12
months to check the analyzer against the specications listed in T
able 1-1.
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Specications and Characteristics
Table 1-1 lists the tracking generator's specications. Unless stated otherwise, all specications
describe the tracking generator's warranted performance under these conditions:
a ve-minute warmup for ambient conditions.
a one-year calibration cycle.
all environmental requirements met.
tracking generator used with one of the compatible spectrum analyzers listed in
Table 1-1, \HP 85640 Specications."
Characteristics provide useful, but non-warranted, information in the form of typical, nominal,
or approximate values for tracking generator performance. See Table 1-2 for a list of tracking
generator characteristics.
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Table 1-1. HP 85640A Specications
Frequency Specications
Frequency Range 300 kHz to 2.9 GHz
Minimum Resolution Bandwidth Supported
HP 8561A, HP 8562A/B 100 Hz
HP 8560A/E, HP 8561B/E, HP 8563A/E 300 Hz
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Amplitude Specications
Output Level
Range 0 dBm to 0 80 dBm
Vernier > 10 dB
Attenuator 70 dB
Maximum leveled output power  0 dBm
Resolution
Attenuator 10 dB steps
Vernier Continuously adjustable
Accuracy
Level atness < 6 2.0 dB
(referenced to 300 MHz, vernier at 0 dB,
attenuator at 0 10 dB)
Output attenuator
Switching Accuracy < 6 0.8 dB per 10 dB step,toa
(10 dB to 70 dB settings, referenced to 0 dB setting maximum of 6 1.5 dB
Spurious Outputs
Unless otherwise specied, with vernier set to 0 dBm
and attenuator set to 0 10 dB
( 0 10 dBm output power)
Harmonic spurious
300 kHz to 2.9 GHz < 0 25 dBc
Non-harmonic spurious
300 kHz to 2.0 GHz < 0 27 dBc
2.0 GHz to 2.9 GHz < 0 23 dBc
LO feedthrough
3.9 GHz to 6.8 GHz < 0 26 dBm
Dynamic Range
Tracking generator feedthrough*
(Spectrum analyzer set to 300 Hz resolution
bandwidth and 0 dB input attenuation.)
300 kHz to 1 MHz < 0 95 dBm
1 MHz to 2.0 GHz < 0 115 dBm
2.0 GHz to 2.9 GHz < 0 110 dBm
* Leakage measured on spectrum analyzer with tracking generator delivering maximum
leveled output power into a 50 termination, and spectrum analyzer input terminated in 50.
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Electromagnetic Specications
Electromagnetic Compatibility
Military specication Conducted and radiated interference complies with CISPR
Publication 11 (1985), and Messempfaenger-
Postverfuegung 526/527/79 (Kennzeichnung Mit
F-Nummer/Funkschutzzeichen).
Meets the requirements of MIL-STD-461B,Part 4,
with the exceptions shown below:
Conducted emissions
CE01 (narrowband) 1 kHz to 15 kHz only
CE03 (narrowband) Full limits
CE03 (broadband) 20 dB relaxation from 15 kHz to 100 kHz
Conducted susceptibility
CS01 Full limits
CS02 Full limits
CS06 Full limits
Radiated emissions
RE01 15 dB relaxation of 30 kHz
(exceptioned from 30 kHz to 50 kHz)
RE02 Full limits to 1 GHz
Radiated susceptibility
RS03 Limited to 1 V/m from 14 kHz to 1 GHz, with 20 dB
relaxation IF frequencies (30 dB relaxation at spectrum
analyzer IF frequencies for Option 001 spectrum
analyzers).
RS01 Full limits
RS02 Exceptioned
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General Specications
Type-tested to MIL-T-28800C, Class 5 environmental conditions as listed below:
Warmup 5 min. from ambient conditions
Temperature
Operating 0 10

C to +50

C
Non-operating 0 62

C to +85

C
Humidity 95% at 40

C for 5 days
Altitude
Operating 15,000 ft
Non-operating 50,000 ft
Vibration
5to15Hz 0.060 in. peak-to-peak excursion
15 to 25 Hz 0.040 in. peak-to-peak excursion
25 to 55 Hz 0.020 in. peak-to-peak excursion
Pulse Shock
Half Sine 30 g for 11 ms duration
Transit Drop 8-in. drop on 6 faces and 8 corners
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