HP 85640A Operation And Service 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-
Packar d'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The sales and service contact information in this manual may be out of date.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:

http://www.agilent.com/find/assist

If you do not have acce ss to t he Internet, contact your fiel d engineer. In any co rresponde nce
or telephone conversation, refer to your instrument by its model number and full serial
number.

All manuals and user guides at all-guides.com

all-guides.com

HP 85640A

RF Tracking Generator

Operation and Service Manual

ABCDE

Printed in USA

All manuals and user guides at all-guides.com

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

.

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

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

All manuals and user guides at all-guides.com

all-guides.com

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.

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-1

All manuals and user guides at all-guides.com

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 to080 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.

1-2 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

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

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-3

All manuals and user guides at all-guides.com

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.

1-4 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

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.

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-5

All manuals and user guides at all-guides.com

all-guides.com

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

1-6 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Amplitude Specications

Output Level

Range 0 dBm to080 dBm

Vernier

>

10 dB

Attenuator 70 dB

Maximum leveled output power



0 dBm

Resolution

Attenuator 10 dB steps

Vernier Continuously adjustable

Accuracy

Level atness

<62.0 dB

(referenced to 300 MHz, vernier at 0 dB,

attenuator at010 dB)

Output attenuator

Switching Accuracy

<60.8 dB per 10 dB step,toa

(10 dB to 70 dB settings, referenced to 0 dB setting maximum of61.5 dB

Spurious Outputs

Unless otherwise specied, with vernier set to 0 dBm

and attenuator set to010 dB

(010 dBm output power)

Harmonic spurious

300 kHz to 2.9 GHz

<025 dBc

Non-harmonic spurious

300 kHz to 2.0 GHz

<027 dBc

2.0 GHz to 2.9 GHz

<023 dBc

LO feedthrough

3.9 GHz to 6.8 GHz

<026 dBm

Dynamic Range

Tracking generator feedthrough*

(Spectrum analyzer set to 300 Hz resolution

bandwidth and 0 dB input attenuation.)

300 kHz to 1 MHz

<095 dBm

1 MHz to 2.0 GHz

<0115 dBm

2.0 GHz to 2.9 GHz

<0110 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.

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-7

All manuals and user guides at all-guides.com

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

1-8 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

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

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-9

All manuals and user guides at all-guides.com

Physical and Mechanical Specications

Power Requirements

Voltage 100, 120, 220, or 240 V ac,610%

Current 47 to 66 Hz

Maximum power dissipation 130 VA, 35 W

Compatibility

Works with HP 8560A/E*, HP 8561A/B/E,

HP 8562A/B, and HP 8563A/E portable

spectrum analyzers.

Weight

8.4 kg (18.5 lb)

Dimensions

A337.6 mm (13.5 in) wide

B461.1 mm (18.3 in) long

C138.6 mm (5.5 in) deep

* Except HP 8560A/E Option 002. This option does not provide sucient 1st LO drive to the

HP 85640A.

1-10 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

Table 1-2. HP 85640A Characteristics

Note

These are not specications. Characteristics provide useful, but nonwarranted,

information about instrument performance.

Frequency Characteristics

Frequency Drift

(after 30-min. warmup) 300 Hz per hour

Tracking Drift

Usable in a 1 kHz RES BW after 5 min.

Usable in a 300 Hz RES BW after 30 min.

Amplitude Characteristics

Output Range

+2.8 dBm to080 dBm

Output Attenuator Repeatability

<60.2 dB

Eective Source Match

0 dB attenuator setting

<

1.92:1

10 dB attenuator setting

<

1.33:1

Dynamic Range

(300 Hz RES BW, 0 dB input attenuation)

300 kHz to 1 MHz

>

95 dB

1 MHz to 2.0 GHz

>

115 dB

2.0 GHz to 2.9 GHz

>

110 dB

HP 85640A RF Tracking Generator Operation and Service Manual

General Information 1-11

All manuals and user guides at all-guides.com

Inputs and Outputs

300 MHz INPUT

Connector BNC female, front panel

Impedance 50

Input amplitude

0

10 dBm61.0 dB

LO INPUT

Connector SMA female, front panel

Impedance 50

Frequency 3.9107 GHz to 6.8107 GHz

Input amplitude +16.5 dBm62.0 dB

0.5V/GHz INPUT

Connector BNC female, rear panel

Impedance

>

100 k

Input amplitude 0.5 V/GHz of tuned frequency

BLANKING INPUT

Connector BNC female, rear panel

Input amplitude

During sweep Low TTL level

During retrace High TTL level

EXT ALC INPUT

Connector BNC female, rear panel

Impedance

>

10 k

Polarity Negative

RF OUTPUT

Connector Type N female, front panel

Impedance 50

Maximum safe reverse level +30 dBm, 30 V dc

Output VSWR See Table 1-1, \HP 85640A Characteristics: Amplitude

Characteristics, Eective Source Match."

1-12 General Information

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

2

Installation

What You'll Find in This Chapter

...

This chapter explains how to set up the HP 85640A tracking generator for operation. You'll

also nd:

Serial numbers of host spectrum analyzers that can be used with the tracking generator.

Line power and line fuse requirements.

Illustrations of front- and rear-panel connections.

HP sales and service oce addresses.

Compatibility with Portable Spectrum Analyzers

The HP 85640A is compatible with these portable spectrum analyzers:

Table 2-1.

Host Spectrum Analyzer-to-Tracking Generator Compatibility

Spectrum Analyzer Model Numbers Serial Number

HP 8560A all serials of non-Option 002

HP 8560E all serials of non-Option 002

HP 8561A all serials

HP 8561B all serials

HP 8561E all serials

HP 8562A all serials

HP 8562B all serials

HP 8563A all serials

HP 8563E all serials

HP 85640A RF Tracking Generator Operation and Service Manual

Installation 2-1

All manuals and user guides at all-guides.com

Initial Inspection

Is the Shipment Complete?

Figure 1-1 shows the parts and accessories that are shipped with your HP 85640A RF tracking

generator. If any part or accessory is missing, contact your sales representative.

Is the Shipping Container in Good Condition?

Inspect the shipping container. If the container or cushioning material is damaged, verify that

the contents are complete and that the analyzer functions correctly, both mechanically and

electrically.

If the contents are incomplete or if the HP 85640A fails the verication tests in Chapter 4,

notify any Hewlett-Packard sales and service oce (see Table 2-3). The HP sales and service

oce will arrange for repair or replacement without waiting for a claim settlement.

Save all packaging materials; show any damages to the container or cushioning materials to the

carrier.

Save the Packaging Materials

The shipping container and cushioning materials are shown in Figure 7-2. Save these materials

,

to use when you ship your instrument, or return it for service or repair

. If the original

materials are not available, you may order replacements from any HP sales and service oce

(see Table 2-3).

Instructions for repackaging the HP 85640A are in \Returning the RF Tracking Generator for

Service" in Chapter 7.

Preparing the RF Tracking Generator for Use

The RF tracking generator must be properly connected to one of the compatible portable

spectrum analyzers listed in Table 2-1. You also need to connect it to an ac power source.If

you want to install your tracking generator in an HP System II cabinet or a standard 19 inch

(486.2 mm) equipment rack, complete instructions are provided with the Option 908 and Option

909 rack mounting kits.

Caution

Before

you connect your tracking generator to an ac power source

, make sure

that the line voltage is correct, the line-voltage selector switch located on

the tracking generator rear panel is set to the correct voltage (refer to the

following paragraphs), and the proper fuse is installed. You can damage the

instrument if you connect it to the wrong voltage.

2-2 Installation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Power Requirements

Table 2-2. Operating Power Requirements

100/120 V ac Operation 220/240 V ac Operation

Line Voltage

100 V to 120 V,610% 220 V to 240 V,610%

Line Current

1 A rms max 0.5 A rms max

Line Frequency

47 Hz to 66 Hz 47 Hz to 66 Hz

HP 85640A RF Tracking Generator Operation and Service Manual

Installation 2-3

All manuals and user guides at all-guides.com

all-guides.com

Setting the Line-Voltage Selector Switch

Set the tracking generator's rear-panel voltage selector switch to the line voltage range

(100, 120, 220, or 240 V) corresponding to the available ac voltage. Insert a small screwdriver

or similar tool in the line-module door slot and gently pry open the door. Rotate the voltage

barrel to the appropriate value.

Figure 2-1. Voltage Selection Switch and Line Fuse Locations

2-4 Installation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Checking the Fuse

The type of ac line input fuse depends on the input line voltage. Use the correct fuse for your

voltage:

100 V to 120 V operation:

1 A 250 V UL/CSA

(HP part number 2110-0823)

(for use in any of the United States)

220 V to 240 V operation:

0.5 A 250 V IEC

(HP part number 2110-0458)

(for use in other countries)

The line fuse is housed in a small container located inside the rear-panel power-connector

module. When replacing a fuse, be sure the arrows on the container match the direction of the

arrows on the power-connector door. See Figure 2-1.

Power Cable

The HP 85640A is equipped with a three-wire power cable

, in accordance with international

safety standards. When connected to an appropriate power source outlet, this cable grounds

the instrument cabinet.

Warning

Failure to ground the instrument properly can result in personal injury

.

Before turning on the tracking generator, you must connect its protective

earth terminals to the protective conductor of the main power cable

.

Insert the main power cable plug only into a socket outlet that has a

protective earth contact.

Do not

defeat the earth-grounding protection by using an extension cable

,

power cable, or auto transformer without a protective ground conductor.

If you are using an auto transformer, make sure its common terminal is

connected to the protective earth contact of the power source socket.

Various power cables are available for the power outlets unique to specic geographic areas.

The appropriate cable is included with the instrument when it is shipped to an area requiring

one of these cables.You can order additional ac power cables listed in Figure 2-2 for use in

dierent areas. Figure 2-2 also illustrates the plug congurations and identies the geographic

area in which each cable is appropriate.

HP 85640A RF Tracking Generator Operation and Service Manual

Installation 2-5

All manuals and user guides at all-guides.com

Figure 2-2. ACPower Cables Available

2-6 Installation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Connecting an HP 85640A to a Compatible Spectrum Analyzer

Figure 1-1 contains the cable part numbers included with your tracking generator at shipment.

Use these cables to connect your portable tracking generator to a compatible spectrum

analyzer. Figure 2-3 and Figure 2-4 illustrate the proper cable connections between the

tracking generator and an HP 8561B spectrum analyzer. Any of the compatible spectrum

analyzers is connected to the same inputs and outputs as illustrated in these gures.

Note

Connect the cables with the tracking generator placed beneath the portable

spectrum analyzer to prevent the cables from obscuring your view of the

display during operation.

Figure 2-3. Front-Panel Cable Connections

HP 85640A RF Tracking Generator Operation and Service Manual

Installation 2-7

All manuals and user guides at all-guides.com

Figure 2-4. Rear-Panel Cable Connections

Note

On HP 8560 E-Series spectrum analyzers, BLANKING OUTPUT is labeled

BLKG/GATE OUTPUT.

Turning On the Tracking Generator

If the tracking generator does not seem to function properly the rst time you turn it on, turn

the power o and refer to the cable connection illustrations in Figure 2-3 and Figure 2-4. If the

cable connections appear to be correct, contact one of the HP sales and service oces listed in

Table 2-3.

2-8 Installation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

Sales and Service Oces

Hewlett-Packard has sales and service oces around the world providing complete support

for Hewlett-Packard products.To obtain servicing information, or to order replacement parts,

contact the nearest Hewlett-Packard sales and service oce listed in Table 2-3 .

In any correspondence, be sure to include the pertinent information about model numbers,

serial numbers, or assembly part numbers.

HP 85640A RF Tracking Generator Operation and Service Manual

Installation 2-9

All manuals and user guides at all-guides.com

Table 2-3. Hewlett-Packard Sales and Service Oces

US FIELD OPERATIONS

Customer Information California, Northern California, Southern

Hewlett-Packard Company Hewlett-Packard Co. Hewlett-Packard Co.

19320 Pruneridge Avenue 301 E. Evelyn 1421 South Manhattan Ave.

Cupertino, CA 95014, USA Mountain View, CA 94041 Fullerton, CA 92631

[phone] [phone] [phone]

Colorado Georgia Illinois

Hewlett-Packard Co. Hewlett-Packard Co. Hewlett-Packard Co.

24 Inverness Place, East 2000 South Park Place 5201 Tollview Drive

Englewood, CO 80112 Atlanta, GA 30339 Rolling Meadows, IL 60008

[phone] [phone] [phone]

New Jersey Texas

120 W. Century Road 930 E. Campbell Rd.

Paramus, NJ 07653 Richardson, TX 75081

[phone] [phone]

EUROPEAN FIELD OPERATIONS

Headquarters France Germany

Hewlett-Packard S.A. Hewlett-Packard France Hewlett-Packard GmbH

150, Route du Nant-d'Avril 1Avenue Du Canada Berner Strasse 117

1217 Meyrin 2/Geneva Zone D'Activite De Courtaboeuf 6000 Frankfurt 56

Switzerland F-91947 Les Ulis Cedex West Germany

(41 22) 780.8111 France (49 69) 500006-0

(33 1) 69 82 60 60

Great Britain

Hewlett-Packard Ltd

Eskdale Road, Winnersh Triangle

Wokingham, Berkshire RF11 5DZ

England

(44 734) 696622

INTERCON FIELD OPERATIONS

Headquarters Australia Canada

Hewlett-Packard Company Hewlett-Packard Australia Ltd. Hewlett- Packard (Canada) Ltd.

3495 Deer Creek Rd. 31-41 Joseph Street 17500 South Service Road

Palo Alto, California 94304-1316 Blackburn, Victoria 3130 Trans- Canada Highway

[phone] (61 3) 895-2895 Kirkland, Quebec H9J 2X8

Canada

[phone]

China Japan Singapore

China Hewlett-Packard Co. Yokogawa-Hewlett-Packard Ltd. Hewlett-Packard Singapore (Pte.) Ltd

38 Bei San Huan X1 Road 1-27-15 Yabe, Sagamihara 1150 Depot Road

Shuang Yu Shu Kanagawa 229, Japan Singapore 0410

Hai Dian District (81 427) 59-1311 (65) 273-7388

Beijing, China

(86 1) 256-6888

Taiwan

Hewlett-Packard Taiwan

8th Floor, H-P Building

337 Fu Hsing North Road

Taipei, Taiwan

(886 2) 712-0404

2-10 Installation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

3

Operation

What You'll Find in This Chapter

...

After a quick overview of the HP 85640A RF tracking generator, you'll learn about:

Using front- and rear-panel features.

Connecting the tracking generator to an HP host portable spectrum analyzer.

Making a simple transmission measurement.

Making a simple reection measurement.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-1

All manuals and user guides at all-guides.com

Front-Panel Features

LINE SWITCH

turns the instrument on or o. The LED above the switch indicates

whether or not ac power is applied to the tracking generator.

LO INPUT

uses the 1st LO output from the host spectrum analyzer to drive the

tuning of the tracking generator.

300 MHz INPUT

uses the 300 MHz calibrator signal (3rd LO) of the host spectrum

analyzer to drive the tracking generator.

RF OUTPUT

is the output signal of the tracking generator.

TRACKING ADJUST

knob

allows you to adjust for any tracking errors that may result from

dierences between the tracking generator output frequency and the

frequency to which the spectrum analyzer is tuned.

The tracking adjust knob is non-linear; clockwise and counter-clockwise

rotation will not necessarily have an equal eect on the displayed

signal.

OUTPUT LEVEL

knobs

adjust the tracking generator's output power. The vernier (left-hand)

knob makes ne-resolution adjustments, while the right-hand knob

adjusts the attenuator from 0 dB to070 dB in 10 dB increments.

UNLEVELED LED

lights when an unleveled condition is detected (except during retrace).

Table 3-1. Front-Panel Interconnections

Connector Frequency Range Amplitude Limits

LO INPUT

(SMA female) 3.9107 GHz06.8107 GHz +16.5 dBm62.0 dB

300 MHz INPUT

(BNC female) N/A

0

10 dBm61.0 dB

RF OUTPUT

(Type N female) 300 kHz02.9 GHz Maximum output power: 0 dBm

Minimum output power:080 dBm

3-2 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Figure 3-1. Front-Panel Feature Overview

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-3

All manuals and user guides at all-guides.com

all-guides.com

Rear-Panel Features

Input power

The appropriate power cable is included with your tracking generator.

Connect the main-power plug only to a socket outlet that has protective

ground contact.

ALC INT EXT

allows you to select between internal and external leveling.

EXT ALC INPUT

allows you to form an external leveling loop, using a negative-polarity

detector.

BLANKING

INPUT

uses the spectrum analyzer's blanking output to deactivate the unleveled

LED during retrace.

0.5V/GHZ INPUT

uses the 0.5 V/GHz output from the spectrum analyzer for atness

compensation.

Table 3-2. Rear-Panel Interconnections

Connector Amplitude Voltage Limits

EXT ALC INPUT

(BNC female) 0to01 V (operating)

6

15 V (damage level)

BLANKING INPUT

(BNC female) TTL high during retrace

TTL low during sweep

0.5 V/GHz INPUT

(BNC female) 0.5 V/GHz of tuned frequency

Figure 3-2. HP 85640A Rear-Panel Feature Overview

3-4 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

HP 85640A and Host Spectrum Analyzer Connections

One SMA cable and three BNC cables connect the tracking generator to a host spectrum

analyzer, as shown in Figure 3-3 and Figure 3-4.

Table 3-3. HP 85640A and Host Spectrum Analyzer Connections

Tracking Generator to Spectrum Analyzer

Front-panel connections

1ST LO INPUT to 1ST LO OUTPUT

300 MHz INPUT to CAL OUTPUT

Rear-panel connections

0.5 V/GHz INPUT to LO SWPj0.5V/GHz OUTPUT

BLANKING INPUT to BLANKING OUTPUT or

BLKG/GATE OUTPUT

Figure 3-3. Tracking Generator-to-Host Analyzer Front-Panel Connections

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-5

All manuals and user guides at all-guides.com

Figure 3-4. Tracking Generator-to-Host Analyzer Rear-Panel Connections

When you have made these connections, select the 0.5 V/GHz output on the spectrum analyzer:

On an HP 8561A or HP 8562A/B, select

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ(FAV)

.

On an HP 8560A/E, HP 8561B/E, or HP 8563A/E press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ (FAV)

.

To view the tracking generator's output, connect the tracking generator's RF OUTPUT directly

to the host spectrum analyzer's INPUT 50 connector. The spectrum analyzer should be tuned

between 300 kHz and 2.9 GHz, within the specied range of the tracking generator.

On an HP 8560E, HP 8561E, or HP 8563E, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNN

GATE OFF

.

3-6 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Measurement Overview

A spectrum analyzer combined with a tracking generator forms a stimulus-response

measurement system. With the tracking generator as the swept source and the spectrum

analyzer as the receiver, operation is analogous to a single-channel scalar network analyzer.It

can be used to characterize a device under test (DUT) in terms of transmission or reection

parameters. Transmission measurements include ripple, atness, and rejection. Return loss is a

typical reection measurement.

Because it is a narrowband system, the tracking generator's output frequency tracks the

spectrum analyzer's input frequency, resulting in a wide dynamic range. This wide dynamic

range is illustrated in the following simplied block diagram.

Figure 3-5. Host Spectrum Analyzer and Tracking Generator System Block Diagram

Making a Stimulus-Response Measurement

There are four basic steps to perform when doing stimulus-response measurements, whether

transmission or reection measurements:

Set up the spectrum analyzer settings.

Calibrate.

Normalize.

Measure.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-7

All manuals and user guides at all-guides.com

Equipment Needed

The DUT used in the transmission and reection measurements shown in this chapter is a

bandpass lter with a 321.4 MHz center frequency and a specied rejection of080 dB.For

the test setups in Figure 3-8 , Figure 3-22, Figure 3-33, and Figure 3-43, you also will need

a directional bridge with sucient range to accommodate the frequency of the DUT, a 50

termination, a short and an open, a barrel or bullet connector (to replace the DUT when

making the reference trace), and appropriate cables and adapters.

Note

If you have an HP 8560A/E, HP 8561B/E, or HP 8563A/E spectrum analyzer,

follow the instructions starting on page 3-9 for a transmission measurement

and on page 3-30 for a reection measurement. These spectrum analyzers

have tracking generator-related softkeys included in their rmware.

If you have an HP 8561A or HP 8562A/B spectrum analyzer, follow the

instructions starting on page 3-21 for a transmission measurement and on

page 3-37 for a reection measurement.

3-8 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

Transmission Measurements

Making a Transmission Measurement Using an HP 8560A/E, HP 8561B/E,

or HP 8563A/E Spectrum Analyzer

Note

Instructions for making transmission measurements using an HP 8561A or

HP 8562A/B begin on page 3-21.

The examples in this section were made using an HP 8560A spectrum analyzer,

but are similar to results you may expect with an HP 8560E, HP 8561B/E or

HP 8563A/E.

Set up the System.

To measure the rejection of a bandpass lter:

1. Make the necessary connections between the spectrum analyzer and the tracking generator

(see Figure 3-3).

2. Examine the tracking generator's output power by connecting its RF OUTPUT directly to

the spectrum analyzer's INPUT 50.

3.

On the spectrum analyzer, press

4

PRESET54FREQUENCY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

START FREQ

300

4

kHz

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STOP FREQ

2.9

4

GHz

5

.

4. Select the 0.5 V/GHz OUTPUT on the spectrum analyzer by pressing

4

AUX CONTROL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ(FAV)

.

On an HP 8560E, HP 8561E, or HP 8563E, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNN

GATE OFF

.

5. Adjust the tracking generator's output power with the OUTPUT LEVEL controls: set the

output power of the tracking generator to010 dBm by setting the attenuator (right-hand)

knob to010 dBm, and the vernier (left-hand) knob to 0 dBm. (The lter we are testing will

not be damaged by the010 dBm power level.)

Figure 3-6 shows the spectrum analyzer display with these settings

.

Note

Although the displayed start frequency annotation was set to 300 kHz, notice

that it remains at 0 Hz. This is due to the resolution of the display. If the stop

frequency is decreased to 1 GHz, the start frequency reads 300 kHz.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-9

All manuals and user guides at all-guides.com

Figure 3-6. Tracking Generator Power over Specied Frequency Range

6. Connect the DUT as shown in Figure 3-8. Figure 3-7 shows the corresponding display.

Figure 3-7. Display of DUT Response

3-10 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Figure 3-8. System Setup for Transmission Measurement

7.

Access tracking generator-related keys by pressing

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENRATOR

.

8. Set the spectrum analyzer's sweep time to stimulus-response auto-coupled mode by

pressing

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SWP CPL SR SA

until SR is selected.

In stimulus-response mode, the auto-coupled sweep times usually are much faster for

swept-response measurements. Stimulus-response auto-coupled sweep times typically are

valid in stimulus-response measurements where the system's frequency span is less than

20 times the bandwidth of the DUT. When a stimulus-response sweep time is chosen, an

E

appears in the special functions area at the left-hand side of the display screen. Figure 3-9

illustrates the faster sweep time of 50 ms instead of 60 ms for the same analyzer settings

.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-11

All manuals and user guides at all-guides.com

Figure 3-9. Faster Sweep Times in Stimulus-Response Auto-Coupled Mode

9. Because this test is for bandpass lter rejection only, tune the spectrum analyzer so the

lter's roll-o takes up most of trace on the display

. Set the start frequency to 1 MHz and

the stop frequency to 1 GHz, as shown in Figure 3-10.

Figure 3-10. Adjusting the Spectrum Analyzer for Measurement Requirements

10. Decrease resolution bandwidth to reduce the displayed average noise level. Press

4BW5

NNNNNNNNNNNNNNNNNNNN

RES BW

(to select MAN), then press

4

+

5

on the spectrum analyzer. In Figure 3-11,

resolution bandwidth is set at 300 kHz.

11. Narrow video bandwidth to smooth the noise; press

NNNNNNNNNNNNNNNNNNNNNNNNNN

VIDEO BW

(to select MAN), then press

4+5

on the spectrum analyzer. In Figure 3-11, video bandwidth is set at 300 Hz.

3-12 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Figure 3-11. Decrease Resolution Bandwidth to Improve Sensitivity

12. Note the decrease in amplitude due to the tracking error. Compensate for any tracking

errors with the TRACKING ADJUST vernier knob on the HP 85640A (see Figure 3-12).

Figure 3-12. Using Tracking Adjust to Compensate for Tracking Error

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-13

All manuals and user guides at all-guides.com

all-guides.com

Note

Tracking errors occur when the tracking generator's output frequency does not

exactly match the input frequency of the spectrum analyzer. The resulting

product from the spectrum analyzer's input mixer is not at the center of the

IF bandwidth. The degradation in tracking causes a decrease of the displayed

amplitude, as shown in Figure 3-13.

Because a small error in tracking causes a larger change in amplitude,

tracking errors are most noticeable in narrow resolution bandwidths. Use

the TRACKING ADJUST vernier knob on the HP 85640A to compensate for

tracking errors.Adjust the knob until the displayed signal increases to its

maximum amplitude.

Figure 3-13. Tracking Error

3-14 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Calibrate.

Notice that the output power of the tracking generator is not perfectly at, as previously

shown in Figure 3-6. This is due in part to the frequency response error, inherent in all scalar

network measurement systems. Normalization is a technique used to eliminate frequency

response errors, thereby increasing the amplitude accuracy of the measurement.

Before normalizing, a reference trace must be taken. For transmission measurements, this

reference trace is referred to as a \thru," because the reference trace is measured with the

DUT removed from the system. For reection measurements, an open/short average is used.

Because you are making a transmission measurement, a thru-reference trace must be stored.

To store the thru trace:

13. Press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENRATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SOURCE CAL MENU

NNNNNNNNNNNNNNNNNNNNNNNNNN

CAL THRU

.

14. The guided calibration routine illustrated in Figure 3-14 prompts you to connect the thru.

Remove the DUT, replacing it with a barrel connector for optimum measurement integrity,

and connect the thru as shown in Figure 3-15.

Figure 3-14. Guided Calibration Prompt

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-15

All manuals and user guides at all-guides.com

Figure 3-15. Thru Connected for Guided Calibration Routines

3-16 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

15.

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STORE THRU

when ready. The thru trace is stored in trace B. It is also stored in an

internal memory location in the analyzer. The state information of the thru-reference trace

is stored in state register #9. This trace can be recalled for future use. In Figure 3-16, the

DUT is reconnected and trace B is in view, showing the thru trace.

Note

If SAVE LOCK is on, pressing

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STORE THRU

causes the message

SAVELOCK ON

to

appear in the active function area. If this happens, press:

a.

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE LOCK OFF

.

b.

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENERATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SOURCE CAL MENU

NNNNNNNNNNNNNNNNNNNNNNNNNN

CAL THRU

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STORE THRU

.

Figure 3-16. Display of Thru-Reference Trace in Trace B

Normalize.

16. To normalize, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENERATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORMLIZE ON OFF

until ON is

selected. Notice that an arrow appears on each side of the graticule when normalization is

activated. These arrows mark the normalized reference position, or the position where 0

dB insertion loss (transmission measurements) or 0 dB return loss (reection measurements)

normally resides.

When normalization is ON, trace math is being performed on the active trace:

A0B + NRP!A

where:

A is the active trace,

B is the stored thru-reference trace,

NRP is the normalized reference position.

When normalization is on, anNappears in the special function section of the display

screen. Notice that the reference level reading changes to dB to reect this relative

measurement (see Figure 3-17).

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-17

All manuals and user guides at all-guides.com

Note

After a reference trace is saved, changing the settings of the spectrum

analyzer, then activating normalization, will cause an

ERR 902 BAD NORM.

Error messages are displayed in the lower right-hand corner of the spectrum

analyzer's display.To clear the error (and obtain a valid measurement), either

reset the analyzer to the same settings as the reference trace, or save a new

reference trace.

Figure 3-17. Normalized Trace

Measure.

17. Measure the rejection range using the spectrum analyzer's delta markers

. Press

4

PEAK SEARCH

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER DELTA

, and adjust the vernier knob on the front panel of the

spectrum analyzer to position the second marker in the rejection area of the bandpass lter

.

See Figure 3-18.

Figure 3-18. Measuring Rejection Range with Delta Markers

18.

Press

4

AMPLITUDE

5

; note that activating normalization changes the

NNNNNNNNNNNNNNNNNNNNNNN

REF LVL

softkey

label to

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORM REF LVL

.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORM REF LVL

, like

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORM REF POSN

, is a trace math function

that allows you to change the position of the normalized trace within the range of the

3-18 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

graticule without changing spectrum analyzer settings. See Figure 3-19. As a result, your

measurement remains calibrated. However, using these two trace math functions may

mean that the top of the screen does not represent the gain-compression limit.

19.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RANGE LVL

increases the dynamic range of the measurement by changing the input

attenuator and IF gain. It is equivalent to

NNNNNNNNNNNNNNNNNNNNNNN

REF LVL

used in signal analysis measurements.

Both

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RANGE LVL

and

NNNNNNNNNNNNNNNNNNNNNNN

REF LVL

ensure the input signal is not in gain compression.

To increase dynamic range of the measurement, press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RANGE LVL

. Note that, while

increasing the dynamic range, more errors are introduced into the measurement, such as

attenuator switching. However, as shown in Figure 3-20 , dynamic range level has increased

when using

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RANGE LVL

.

Figure 3-19.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORM REF LVL

Adjusts the Trace and Retains Analyzer Settings

Figure 3-20.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RANGE LVL

Increases Dynamic Measurement Range

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-19

All manuals and user guides at all-guides.com

Note

If the actual signal measurement is beyond the gain-compression limit, or

below the bottom graticule of the display, an error message appears in the

lower right-hand corner of the display. In the case shown in Figure 3-20,

the passband information has been adjusted o-screen in order to view

the rejection range with better resolution. Changing the analyzer settings

to raise the pass-band information above the top of the screen causes an

ERR 903 A>DLMT

.

3-20 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Making a Transmission Measurement Using an HP 8561A or HP 8562A/B

Spectrum Analyzer

Note

Instructions for making transmission measurements using an HP 8560A/E,

HP 8561B/E, or HP 8563A/E begin on page 3-9.

The examples in this section were made using an HP 8562B spectrum analyzer,

but are similar to results you may expect with an HP 8561A or HP 8562A.

Set up the System.

To measure the rejection of a bandpass lter:

1. Make the necessary connections between the spectrum analyzer and the tracking generator

(see Figure 3-3).

2. Examine the tracking generator's output power by connecting its RF OUTPUT directly to

the spectrum analyzer's INPUT 50. On the spectrum analyzer, press

4

PRESET54FREQUENCY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

START FREQ

300

4

kHz

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STOP FREQ

2.9

4

GHz

5

.

3. Select the 0.5 V/GHz OUTPUT on the spectrum analyzer by pressing

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ(FAV)

.

On an HP 8560E, HP 8561E, or HP 8563E, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNN

GATE OFF

.

4. Adjust the tracking generator's output power with the OUTPUT LEVEL controls; set the

output power of the tracking generator to010 dBm by setting the attenuator (right-hand)

knob to010 dBm, and the vernier (left-hand) knob to 0 dB

. (The lter we are testing will

not be damaged by the010 dBm power level.)

Figure 3-21 shows the spectrum analyzer display with these settings

.

Note

Although the displayed start frequency annotation was set to 300 kHz, notice

that it remains at 0 Hz. This is due to the resolution of the display

. If the stop

frequency is decreased to 1 GHz, the start frequency reads 300 kHz.

Figure 3-21. Tracking Generator Power over Specied Frequency Range

5. Connect the DUT as shown in Figure 3-22. Figure 3-23 shows the corresponding display

.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-21

All manuals and user guides at all-guides.com

Figure 3-22. System Setup for Transmission Measurement

Figure 3-23. Display of DUT Response

3-22 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

6. Because this test is for bandpass lter rejection only, tune the spectrum analyzer so the

lter's roll-o takes up most of trace on the display. Set the start frequency to 1 MHz and

the stop frequency to 1 GHz, as shown in Figure 3-24.

Figure 3-24. Adjusting the Spectrum Analyzer for Measurement Requirements

Note

HP 8561A and HP 8562A/B spectrum analyzers do not have tracking

generator-related keys. Sweep-time settings during a stimulus-response

measurement are highly dependent on the device under test. Any changes to

resolution bandwidth, span, or other analyzer settings may cause a change in

sweep time.

Setting Sweeptimes

Accurate stimulus-response measurements typically can use sweeptimes much

faster than auto-coupled sweeptimes. The following procedure calculates the

fastest sweeptime for stimulus-response measurements, assuming the span is

less than 20 times the bandwidth of the DUT:

1. Note the autocoupled sweeptime.

2. Calculate each of the following:

a. span (Hz) / 156 GHz

b. 500 / resolution bandwidth (Hz)

c. 200 / video bandwidth (Hz)

3. Determine the greatest of the values in steps 2a, 2b

, and 2c.

4. Set sweeptime to the smaller of the values in steps 1 and 3. The analyzer

will limit sweeptime to 50 msec or less in non-zero spans.

If the value in step 4 is less than the auto-coupled sweeptime, the

MEAS UNCAL

indicator will be displayed; this message may be ignored, as it has no eect on

the outcome of the measurement.

7. Decrease resolution bandwidth to reduce the displayed average noise level. Press

4BW5

N

NNNNNNNNNNNNNNNNNNN

RES BW

4

+

5

on the spectrum analyzer. Note the decrease in amplitude due to the tracking

error.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-23

All manuals and user guides at all-guides.com

all-guides.com

8. Narrow the video bandwidth to smooth the noise; press

4BW5

NNNNNNNNNNNNNNNNNNNNNNNNNN

VIDEO BW

4+5

on the

spectrum analyzer. In Figure 3-25, video bandwidth is set at 300 Hz.

9. Recalculate the sweeptime, as described in the note above.

Figure 3-25. Decrease Resolution Bandwidth to Improve Sensitivity

10. Use TRACKING ADJUST on the HP 85640A to compensate for any tracking errors (see

Figure 3-26).

Figure 3-26. Using TRACKING ADJUST to Compensate for Tracking Error

3-24 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Note

Tracking errors occur when the tracking generator's output frequency does not

exactly match the input frequency of the spectrum analyzer. The resulting

product from the spectrum analyzer's input mixer is not at the center of the

IF bandwidth. The degradation in tracking causes a decrease of the displayed

amplitude, as shown in Figure 3-27.

Because a small error in tracking causes a larger change in amplitude,

tracking errors are most noticeable in narrow resolution bandwidths. Use

the TRACKING ADJUST vernier knob on the HP 85640A to compensate for

tracking errors.Adjust the knob until the displayed signal increases to its

maximum amplitude.

Figure 3-27. Tracking Error

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-25

All manuals and user guides at all-guides.com

Calibrate.

Notice that the output power of the tracking generator is not perfectly at, as previously

shown in Figure 3-21. This is due in part to the frequency response error, inherent in all scalar

network measurement systems. Normalization is a technique used to eliminate frequency

response errors, thereby increasing the amplitude accuracy of the measurement.

Before normalizing, a reference trace must be taken. For transmission measurements, this

reference trace is referred to as a \thru," because the reference trace is measured with the

DUT removed from the system. For reection measurements, an open/short average is used.

Because you are making a transmission measurement, a thru-reference trace must be stored.

To store the thru trace:

11. Remove the DUT, replacing it with a barrel connector for optimum measurement integrity.

Connect the thru, as shown in Figure 3-28.

Figure 3-28. Thru Connected for Calibration Routine

12.

Store the thru trace in trace B by pressing

4

TRACE

5

NNNNNNNNNNNNNNNNNNNNNNN

TRACE B

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CLR-WRT B

.Wait for the new

speed to nish, then

NNNNNNNNNNNNNNNNNNNN

VIEW B

.

13.

For future reference, store the thru trace in a trace register

. Press

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE TRACE B

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

(wherenis the number of the trace register.)

3-26 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Note

If SAVE LOCK is on, pressing

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

on an HP 8561A/62A causes the

message

SAVELOCK ON

to appear in the active function area.

If this happens, press

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVELOCK OFF

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE TRACE B

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

Figure 3-29 shows the on-screen condition after a thru trace is stored. In the illustration, the

DUT is reconnected and trace B is in view, displaying the thru trace.

Figure 3-29. Display of Thru-Reference Trace in Trace B

Normalize.

14. To normalize, activate the trace math function, A0B+DL!A, by pressing

4

TRACE

5

NNNNNNNNNNNNNN

MORE

.

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

A0B+DL!A ON OFF

to select ON.

Note

When trace math is on, anMwill appear in the special functions section of the

display.

15. If necessary, make adjustments to the position of the trace by changing the position of the

display line.Access the display line by pressing

4

DISPLAY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

DSPL LIN ON OFF

. The preset

value of the display line is 0 dBm.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-27

All manuals and user guides at all-guides.com

16. Reconnect the DUT. Figure 3-30 shows the normalized trace.

Figure 3-30. Normalized Trace

Measure.

17. Measure the rejection range using the spectrum analyzer's delta markers

. Press

4

PEAK SEARCH

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER DELTA

, and adjust the vernier knob on the front panel of the

spectrum analyzer to position the second marker in the rejection area of the bandpass lter

.

See Figure 3-31.

Figure 3-31. Measuring Rejection Range with Delta Markers

3-28 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

18.

NNNNNNNNNNNNNNNNNNNNNNN

REF LVL

increases the dynamic range of the measurement by changing the input

attenuator and IF gain. It makes sure the input signal is not in gain compression. To

increase the dynamic range of the measurement, press

4

AMPLITUDE

5

NNNNNNNNNNNNNNNNNNNNNNN

REF LVL

4+5

. Note that

while increasing the dynamic range, more errors are introduced into the measurement.

Figure 3-32 shows the results of increasing the dynamic range. Notice that the top of the

screen does not necessarily represent the gain-compression limit.

Figure 3-32. Increased Dynamic Measurement Range

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-29

All manuals and user guides at all-guides.com

Reection Measurements

Making a Reection Measurement Using an HP 8560A/E, HP 8561B/E, or

HP 8563A/E Spectrum Analyzer

Note

Instructions for making reection measurements using an HP 8561A or

HP 8562A/B begin on page 3-37.

The examples in this section were made using an HP 8560A spectrum analyzer,

but are similar to results you may expect with an HP 8560E, HP 8561B/E or

HP 8563A/E.

Set up the System.

To measure the return loss of a bandpass lter:

1. Make the necessary connections between the spectrum analyzer and the tracking generator

(see Figure 3-3).

2. Select the 0.5 V/GHz OUTPUT on the spectrum analyzer by pressing

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ(FAV)

.

On an HP 8560E, HP 8561E, or HP 8563E, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNN

GATE OFF

.

3. Examine the tracking generator's output power by connecting its RF OUTPUT directly to

the spectrum analyzer's INPUT 50.

4.

On the spectrum analyzer, Press

4

PRESET54FREQUENCY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

START FREQ

300

4

kHz

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STOP FREQ

2.9

4

GHz

5

.

Calibrate.

5. Connect the DUT as shown in Figure 3-33. The corresponding display is illustrated in

Figure 3-34.

3-30 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Figure 3-33. System Setup for a Reection Measurement

Figure 3-34. Display with System Congured for a Reection Measurement

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-31

All manuals and user guides at all-guides.com

6. Adjust the tracking generator's output power with the OUTPUT LEVEL controls: increase

the output power 6 dB by setting the attenuator (right-hand) knob to 0 dBm and the

vernier (left-hand) knob to04 dBm. This output-power level diers from the level used for

the transmission measurement example because a 6 dB coupler is used in the reection

measurement setup.

7. Select stimulus-response auto-coupled sweep time mode for the spectrum analyzer by

pressing

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENRATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SWP CPL SA SR

until SR is selected.

8. Adjust the spectrum analyzer settings according to the measurement requirements.For this

measurement, set the analyzer to frequencies around the minimum reection region of the

lter. Change the start frequency to 1 MHz and the stop frequency to 1 GHz. Figure 3-35

illustrates what should appear on-screen.

Note

On the HP 8560A/E, HP 8561B/E, or HP 8563A/E, the minimum resolution

bandwidth supported in stimulus-response measurements is 300 Hz.

Figure 3-35. Spectrum Analyzer Display of Bandpass Filter Region

To store an open/short-average reference trace:

9. Remove the DUT.

10. Press

4

AUX CTRL

5

N

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENRATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SOURCE CAL MENU

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CAL OPN/SHRT

.

11. The analyzer will prompt you to connect the open (Figure 3-36).

3-32 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Figure 3-36. On-Screen Prompts to Connect an Open

Figure 3-37. Connect the Open

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-33

All manuals and user guides at all-guides.com

all-guides.com

12.

After connecting the open as shown in Figure 3-27, press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STORE OPEN

.

13. The analyzer will prompt you to connect the short (Figure 3-38).

Figure 3-38. On-Screen Prompts to Connect an Short

14. Connect the short as shown in Figure 3-39.

Figure 3-39. Connect the Short

3-34 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

15.

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

AVERAGE SHORT

. The analyzer takes the average of the open and short traces,

then stores the averaged trace in the analyzer's internal memory and in trace B. The

corresponding state information is stored in state register #8.

Note

If SAVE LOCK is on, pressing

N

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

AVERAGE SHORT

causes the message

SAVELOCK

ON

to appear in the active function area. If this happens, press:

a.

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE LOCK OFF

.

b.

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TRACKING GENERATOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SOURCE CAL MENU

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CAL SHORT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STORE SHORT

.

Normalize.

16. Reconnect the DUT, and normalize by pressing

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORMLIZE ON OFF

until ON is selected. The

normalized trace is shown in Figure 3-40. In this case,

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NORM REF POSN

was adjusted for

better viewing of the signal.

Figure 3-40. Normalized Return Loss Measurement

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-35

All manuals and user guides at all-guides.com

Measure.

17. Read the return loss by activating the marker. Press

4

MKR

5

. Use the analyzer's knob to

position the marker at the frequency of interest. See Figure 3-41 .

Figure 3-41. Return Loss Reading Using the

4

MKR

5

Function

3-36 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Making a Reection Measurement Using an HP 8561A or HP 8562A/B

Spectrum Analyzer

Note

Instructions for making reection measurements using an HP 8560A/E,

HP 8561B/E, or HP 8563A/E begin on page 3-30.

The examples in this section were made using an HP 8562B spectrum analyzer,

but are similar to results you may expect with an HP 8561A or HP 8562A.

Set up the System.

To measure the return loss of a bandpass lter:

1. Make the necessary connections between the spectrum analyzer and the tracking generator

(see Figure 3-3).

2. Examine the tracking generator's output power by connecting its RF OUTPUT directly to

the spectrum analyzer's INPUT 50. On the spectrum analyze, Press

4

PRESET54FREQUENCY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

START FREQ

300

4

kHz

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

STOP FREQ

2.9

4

GHz

5

.

3. Select the 0.5 V/GHz OUTPUT on the spectrum analyzer by pressing

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHZ(FAV)

.

Note

HP 8561A and HP 8562A/B spectrum analyzers do not have tracking

generator-related keys. Sweep-time settings during a stimulus-response

measurement are highly dependent on the device under test. Any changes to

resolution bandwidth, span, or other analyzer settings may cause a change in

sweep time.

Setting Sweeptimes

Accurate stimulus-response measurements typically can use sweeptimes much

faster than auto-coupled sweeptimes. The following procedure calculates the

fastest sweeptime for stimulus-response measurements, assuming the span is

less than 20 times the bandwidth for the DUT:

1. Note the autocoupled sweeptime.

2. Calculate each of the following:

a. span (Hz) / 156 GHz

b. 500 / resolution bandwidth (Hz)

c. 200 / video bandwidth (Hz)

3. Determine the greatest of the values in steps 2a, 2b

, and 2c.

4. Set sweeptime to the smaller of the values in steps 1 and 3. The analyzer

will limit sweeptime to 50 msec or less in non-zero spans.

If the value in step 4 is less than the auto-coupled sweeptime, the

MEAS UNCAL

indicator will be displayed; this message may be ignored, as it has no eect on

the outcome of the measurement.

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-37

All manuals and user guides at all-guides.com

Calibrate.

4. Connect the DUT as shown in Figure 3-43. The corresponding display is illustrated in

Figure 3-42.

Figure 3-42. Display with the System Congured for a Reection Measurement

Figure 3-43. System Setup for a Reection Measurement

3-38 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

5. Adjust the tracking generator's output power with the OUTPUT LEVEL controls: increase

the output power 6 dB by setting the attenuator (right-hand) knob to 0 dBm and the

vernier (left-hand) knob to04 dBm. This output-power level diers from the level used for

the transmission measurement example because a 6 dB coupler is used in the reection

measurement setup.

6. Adjust the host analyzer's settings according to the measurement requirements.For this

measurement, set the analyzer to frequencies around the minimum reection region of

the lter. Change the start frequency to 1 MHz and the stop frequency to 1 GHz. Figure

Figure 3-44 shows what should appear on the display.

Figure 3-44. Spectrum Analyzer Display of Bandpass Filter Region

Note

Unlike the thru-reference trace, an open/short average-reference trace cannot

be performed from the front panel of an HP 8561A or HP 8562A/B

. However,

this measurement can be done via remote operation.

The program should perform the following steps:

1. Read the open trace.

2. Read the short trace.

3. Average the two traces.

4. Put the average trace into trace B.

For more information, refer to the host analyzer's operating and programming

manual, and to the

HP 85620A Mass Memory Module Operating and

Programming Manual

.

7. On HP 8561A and HP 8562A/B host analyzers, an open/short average-reference trace can

only be performed via remote operation (see note). If a controller is not available, steps 8

through 10 will establish a reference trace using only a short.

8. Remove the DUT. Replace it with a short.

9.

Press

4

TRACE

5

NNNNNNNNNNNNNNNNNNNNNNN

TRACE B

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CLR-WRT B

.Wait for a new sweep to nish. Press

NNNNNNNNNNNNNNNNNNNN

VIEW B

.

10.

For future reference, store the short trace in a trace register

. Press

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE TRACE B

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

(wherenis the number of the trace register).

HP 85640A RF Tracking Generator Operation and Service Manual

Operation 3-39

All manuals and user guides at all-guides.com

Note

If SAVE LOCK is on, pressing

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

on an HP 8561A/62A causes the

message

SAVELOCK ON

to appear in the active function area.

If this happens, press

4

SAVE

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVELOCK OFF

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SAVE TRACE B

NNNNNNNNNNNNNNNNNNNNNNN

TRACE n

.

Normalize.

11. Reconnect the DUT.

12. To normalize, activate the trace math function A0B+DL!A, by pressing

4

TRACE

5

NNNNNNNNNNNNNN

MORE

. Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

A0B+DL!A ON OFF

until ON is selected.

13. If necessary, make adjustments to the position of the trace by changing the position of the

display line.Access the display line by pressing

4

DISPLAY

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

DSPL LIN ON OFF

. The preset

value of the display line is 0 dBm.

Measure.

14. Read the return loss by activating the marker. Press PEAK SEARCH

4ON5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER DELTA

,

then use the analyzer's adjustment knob to position the marker at the frequency of interest

(typically the point of maximum return loss). See Figure 3-45.

Figure 3-45. Return Loss Reading Using the

4

MKR

5

Function

3-40 Operation

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

4

Performance Tests

What You'll Find in This Chapter

...

This chapter contains performance test procedures that verify the electrical performance of

the HP 85640A RF tracking generator against the specications in Table 1-1. None of the test

procedures requires removing the instrument cover.

To test the tracking generator, you must connect it to a powered-on Hewlett- Packard spectrum

analyzer. Any one of the following may serve as the \host" spectrum analyzer:

HP 8560A/E spectrum analyzer (non-Option 002)

HP 8561A/B/E spectrum analyzer

HP 8562A/B spectrum analyzer

HP 8563A/E spectrum analyzer

What is Performance Verication?

The highest-level testing, called

performance verication

, tests the tracking generator's

performance against all its specications listed in Table 1-1. Table 4-1 lists all performance

verication tests and test equipment required to perform each test. Refer to each test for

appropriate adapters and cables.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-1

All manuals and user guides at all-guides.com

Table 4-1. Performance Tests

Test

Number

Test Name Equipment Used

1 Output attenuator accuracy Measuring receiver

Host spectrum analyzer*

2 Maximum leveled output power 50 termination

Host spectrum analyzer*

3 Level atness Measuring receiver

Power sensor

Host spectrum analyzer*

4 Harmonic spurious outputs Microwave spectrum analyzer

Host spectrum analyzer*

5 Non-harmonic spurious outputs Microwave spectrum analyzer

Host spectrum analyzer*

6 LO feedthrough amplitude Microwave spectrum analyzer

Host spectrum analyzer

7 Tracking generator feedthrough 50 termination

Host spectrum analyzer*

8 Frequency tracking range Frequency counter

Power splitter

Host spectrum analyzer*

* A host spectrum analyzer can be any one of these models:

HP 8560A or HP 8560E spectrum analyzer (non-Option 002)

HP 8561A, HP 8561B or HP 8561E spectrum analyzer

HP 8562A or HP 8562B spectrum analyzer

HP 8563A or HP 8563E spectrum analyzer

4-2 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Before Beginning

The HP 85640A RF tracking generator requires at least a ve-minute warm-up before beginning

the performance tests.

Figure 4-1 illustrates the connections to make between the host spectrum analyzer and the

tracking generator.You must also set the rear-panel sweep output to 0.5 V/GHz as instructed

in each performance test. Retain the cable conguration illustrated in Figure 4-1 unless a test

procedure species otherwise.

Figure 4-1. HP 85640A RF Tracking Generator Connections

Test Equipment You'll Need

Refer to Table 4-2 for the recommended test equipment model numbers

. Any equipment that

meets the critical specications given in the table may be substituted for the recommended

model(s). The table also lists the recommended test equipment for the tracking generator's

adjustment procedures located in Chapter 5, \Adjustment Procedures," and the troubleshooting

procedures in Chapter 7, \Service Information."

Note

Each host spectrum analyzer has a required warm-up time; refer to Table 1-1 in

the appropriate installation and verication manual for specications.

Each performance test in this section describes setting your host spectrum

analyzer for 0.5 V/GHz output.

Recording Test Results

Record test results in the performance test record located at the end of this chapter. The table

lists test specications and acceptable limits.We recommend that you make a copy of this

table, record the complete test results on the copy, and keep the copy for your calibration test

record. This record could prove invaluable in tracking gradual changes in test results over long

periods of time.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-3

All manuals and user guides at all-guides.com

all-guides.com

Table 4-2. Recommended Test Equipment

Instrument Critical Specications

for Equipment Substitution

Recommended

Model

Use

Host spectrum Compatible with the tracking generator HP 8560A/E, P,A,T

analyzer (See Table 1-1) HP 8561A/B/E,

HP 8562A/B

HP 8563A/E

Microwave spectrum Frequency range: 300 kHz to 7 GHz HP 8566A/B* P,T

analyzer Relative amplitude accuracy:

300 kHz to 2.7 GHz:<6

1.8 dB

300 kHz to 7 GHz:<6

4.0 dB

Absolute amplitude accuracy:

3.9 GHz to 6.9 GHz:<6

2.7 dB

Frequency accuracy:

<610 kHz at 7 GHz

Microwave frequency Frequency range: 1 MHz to 2.9 GHz HP 5343A* P,A,T

counter Timebase accuracy (aging):<5210

0

10

/day Option 001

External frequency reference input

Measuring receiver Compatible with power sensor HP8902A* P,A,T

dB-relative mode

Resolution: 0.01 dB

Reference accuracy:<6

1.2%

Tuned RF level mode

Tuned RF level accuracy:<6

0.15 dB

Tuned RF level frequency range: 300 MHz61 MHz

Power sensor Frequency range: 300 kHz to 2.9 GHz HP 8482A* P,A,T

Maximum SWR:

1.1 (1 MHz to 2.0 GHz)

1.30 (2.0 GHz to 2.9 GHz)

Digital Voltmeter Range:015 V dc to +15 V dc HP 3456A* A,T

Accuracy:<6

10 mV on 100 V range

Input impedance:1M

Power splitter Frequency range: 300 kHz to 2.9 GHz HP 11667A P,A,T

Insertion loss: 6 dB (nominal)

Output tracking:<0.25 dB

Equivalent output SWR:<1.22

P=Performance tests; A = Adjustments; T = Troubleshooting;3Part of microwave workstation

4-4 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

Table 4-2. Recommended Test Equipment (continued)

Instrument Critical Specications

for Equipment Substitution

Recommended

Model

Use

DVM test leads



36 inches, alligator clips, probe tips HP 34118A A,T

Termination Frequency range: dc to 2.9 GHz HP 908A P,A

Impedance: 50

Maximum SWR:<1.05

Connector: Type N

Adapters BNC (f) to SMB (f) HP 1250-1236 A

Type N (f) to APC 3.5 (f) HP 1250-1745 P

Type N (m) to BNC (f) HP 1250-1476 P,A

Cable, RG-214/U Connectors: Type N (m) HP 11500B/C P,A

(two required)

Length:61 cm (24 in)

Cable, 50 Coaxial Connectors: BNC (m) HP 10502A P,A

(two required)

Length:23 cm (9 in)

Cable, 50 Coaxial Connectors: BNC (m) HP 10503A P,A,

(two required)

Length:122 cm (48 in)

Cable Frequency range: dc to 300 MHz HP 8120-1839 P,A

(three required)

Connectors: BNC (m), both ends

Length:62 cm (24 in)

Cable Frequency range: 3.9 to 6.9 GHz HP 5061-9038 P,A,T

Maximum SWR:<1.4:1

Maximum insertion loss: 1.5 dB

Connectors: SMA(m), both ends

Length:52 cm (20 in.)

Non-metallic N/A HP 8710-0033 A

alignment tool

Balldriver 0.050 in HP 8710-1199 A

Hexdriver 0.050 in HP 8710-1250 T

P=Performance tests; A = Adjustments; T = Troubleshooting

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-5

All manuals and user guides at all-guides.com

1. Output Attenuator Accuracy

Specication

<60.8 dB/10 dB step<6

1.5 dB maximum for attenuator settings 10 to 70 dB,

referenced to 0 dB setting

Related Adjustment

There is no related adjustment for this performance test.

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT

50. Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's

RF OUTPUT is then connected to the input of a measuring receiver. The measuring receiver,

used in its tuned RF level (TRFL) mode, measures the tracking generator's output attenuator

accuracy relative to the 0 dB attenuator setting. The step-to-step error is calculated.

Figure 4-2. Output Attenuator Accuracy Test Setup

4-6 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

1. Output Attenuator Accuracy

Equipment

Measuring receiver .................................................... HP 8902A

Host spectrum analyzer . . . HP 8560A/E, 8561A/B/E, HP 8562A/62B, or HP 8563A/E

Cables

Type N, 62 cm (24 in) . ............................................. HP 11500B/C

BNC, 62 cm (24 in)

(3 required)

........................................ 8120-1839

SMA, 52 cm (20 in) . . . ................................................. 5061-9038

Procedure

1. Connect the equipment as shown in Figure 4-2. Use the type N cable to connect the

tracking generator RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ . ......................................................300 MHz

SPAN ....................................................................0 Hz

RES BW .............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B

, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal level on the host spectrum analyzer.

5. Set the tracking generator OUTPUT LEVEL vernier to 0 dBm.

Do not

readjust the OUTPUT

LEVEL vernier control for the remainder of this test.

6. Connect the type N cable to the tracking generator RF OUTPUT and the measuring receiver

INPUT 50 connectors.

7. On the measuring receiver, press the blue shift-key AUTOMATIC OPERATION (INSTR

PRESET), FREQ

4

MHz

5

(INPUT FREQ), gold shift-key, RF POWER (TUNED RF LEVEL), 4.4,

4

SPCL

5

, 32.0,

4

SPCL

5

, blue shift-key, ZERO (SET REF), LOG/LIN. The display should read

0.00 dB60.01 dB.

8. Set the tracking generator OUTPUT LEVEL attenuator control to each of the settings listed

in Table 4-3. If

RECAL

is displayed on the measuring receiver, press CALIBRATE. At each

attenuator setting, subtract the attenuator setting (always negative) from the measuring

receiver reading and record the result as the cumulative attenuator accuracy (CAA) in

Table 4-3.

CAA = measuring receiver reading0attenuator setting

9. Calculate the step-to-step attenuator accuracy for each setting other than 0 dB by

subtracting the previous CAA from the current CAA. Record the result in Table 4-3 as the

step-to-step attenuator accuracy (SSAA) for the current attenuator setting.

SSAA = current CAA0previous CAA

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-7

All manuals and user guides at all-guides.com

1. Output Attenuator Accuracy

Table 4-3. Output Attenuator Accuracy

Output Level

Attenuator Setting

Attenuator Accuracy Measurement

Uncertainty

(dB) Cumulative (dB) Step-to-Step (dB) (dB)

0 0 (Ref) 0 (Ref) 0 (Ref)

0

10

6

0.40

0

20 +0.07/00.08

0

30

6

0.09

0

40

6

0.10

0

50

6

0.11

0

60

6

0.12

0

70 +0.12/00.13

4-8 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

2. Maximum Leveled Output Power

2. Maximum Leveled Output Power

Specication

Maximum leveled output power:



0 dBm

Related Adjustment

Tracking generator power level adjustments

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT 50.

Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's RF

OUTPUT is then terminated in 50.

The tracking generator is set to specied output level settings and slowly swept from 300 kHz

to 2.9 GHz. The UNLEVELED indicator is monitored to check for an unleveled condition. If

the UNLEVELED indicator is not activated during the sweep, the tracking generator meets

this specication. If the UNLEVELED indicator is activated during the sweep

, the OUTPUT

LEVEL vernier setting is decreased until the output remains leveled during the entire sweep

.

This setting is recorded.

Figure 4-3. Maximum Leveled Output Power Test Setup

Equipment

Host spectrum analyzer . . . . . . HP 8560A/E, 8561A/B/E, HP 8562A/B, or HP 8563A/E

50 termination ....................................................... HP

908A

Cables

Type N, 62 cm (24 in) . ............................................. HP 11500B/C

BNC, 62 cm (24 in)

(3 required)

........................................

8120-1839

SMA, 52 cm (20 in) . . . .................................................

5061-9038

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-9

All manuals and user guides at all-guides.com

2. Maximum Leveled Output Power

Procedure

1. Connect the equipment as shown in Figure 4-3. Use the type N cable to connect the

tracking generator's RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ .....................................................300 MHz

SPAN ...................................................................0 Hz

RES BW ............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal level on the host spectrum analyzer.

Note

The OUTPUT LEVEL vernier is prone to parallax error

.To minimize parallax

when setting the knob, view the pointer and the scale marking directly from

the front of the instrument panel. The ridges on the knob are also useful for

properly aligning the pointer with the scale marking.

5. Set the tracking generator OUTPUT LEVEL vernier precisely to 0 dBm. Locate the groove

on the vernier knob closest to the pointer on the knob

.Follow this groove down the knob

to the front panel. Align this groove with the front-panel \0" mark.

6. Disconnect the type N cable from the tracking generator RF OUTPUT

.Terminate the RF

OUTPUT using the 50 termination.

7. Set the host spectrum analyzer controls as follows:

START FREQ ....................................................... 300 kHz

STOP FREQ ......................................................... 2.9 GHz

SWEEP TIME . . ....................................................... 10 sec

8. Check the UNLEVELED indicator function by temporarily disconnecting the BNC

cable between the host spectrum analyzer CAL OUTPUT and the tracking generator

300 MHz INPUT connectors. The UNLEVELED indicator should light when this cable is

disconnected. Reconnect the BNC cable.

9. Watch the UNLEVELED indicator as the host spectrum analyzer sweeps

. If the

UNLEVELED indicator does not light during a sweep, proceed to step 13 and enter

>

0 dBm as the maximum leveled output power in the space provided below

.

10. If the UNLEVELED indicator does light anytime during a sweep, reduce the OUTPUT

LEVEL vernier setting by 1 dB.

11. Watch the UNLEVELED indicator as the host spectrum analyzer sweeps. If the

UNLEVELED indicator does not light during a sweep, proceed to step 13.

4-10 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

2. Maximum Leveled Output Power

12. Repeat steps 9 through 11 until an OUTPUT LEVEL vernier setting is achieved that results

in a leveled output during the entire sweep.

13. Record the power level value indicated by the OUTPUT LEVEL vernier as the maximum

leveled output power.

Maximum leveled output power dBm

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-11

All manuals and user guides at all-guides.com

3. Level Flatness

Specication

Flatness:

<62.0 dB referenced to 300 MHz, 10 dB attenuation, 0 dB vernier setting

Related Adjustment

Power level adjustment

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT

50. Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's

RF OUTPUT is then connected to a calibrated power sensor and the power level is measured

at 300 MHz. The measuring receiver is set to RATIO mode so that subsequent power-level

readings are dB relative to the power level at 300 MHz.

The tracking generator is stepped through several frequencies within its range. The

output-power dierence relative to the power level at 300 MHz is measured at each frequency

and recorded.

Figure 4-4. Level Flatness Test Setup

4-12 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

3. Level Flatness

Equipment

Host spectrum analyzer . . . . . . HP 8560A/E, 8561A/B/E, HP 8562A/B, or HP 8563A/E

Measuring receiver .................................................... HP 8902A

Power sensor . . . ...................................................... HP 8482A

Cables

Type N, 62 cm (24 in) . ............................................. HP 11500B/C

BNC, 62 cm (24 in)

(3 required)

........................................ 8120-1839

SMA, 52 cm (20 in) . . . ................................................. 5061-9038

Procedure

1. Connect the equipment as shown in Figure 4-4. Use the type N cable to connect the

tracking generator's RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ .....................................................300 MHz

CF STEP ...........................................................100 MHz

SPAN ...................................................................0 Hz

RES BW ............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B

, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

N

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal amplitude on the host spectrum analyzer

.

5. Zero and calibrate the measuring-receiver/power-sensor combination in log mode (power

level readings are in dBm). Enter the power sensor's 300 MHz calibration factor into the

measuring receiver.

6. Replace the type N cable on the RF OUTPUT with the power sensor

.

7. On the tracking generator, set the OUTPUT LEVEL vernier knob to 0 dBm and the OUTPUT

LEVEL attenuator knob to010 dB.

8.

On the host spectrum analyzer, press

4

TRIG

5

N

NNNNNNNNNNNNNNNNNNN

SINGLE

.

9. Press RATIO on the measuring receiver. The measuring receiver readings are now relative

to the power level at 300 MHz.

10.

Set the spectrum analyzer center frequency to 300 kHz. Press

4

TRIG

5

NNNNNNNNNNNNNNNNNNNN

SINGLE

.

11. Enter the appropriate power sensor calibration factor into the measuring receiver as

indicated in Table 4-4.

12. Record the measuring receiver power level reading as the atness in Table 4-4.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-13

All manuals and user guides at all-guides.com

all-guides.com

3. Level Flatness

13. Repeat steps 10 through 12 to measure the atness at each CENTER FREQ setting listed in

Table 4-4. The

4*5

key can be used to tune to center frequencies above 100 MHz.

14. Record the most positive atness reading in Table 4-4 as the maximum atness.

Maximum atness dB

15. Record the most negative atness reading in Table 4-4 as the Minimum Flatness.

Minimum atness dB

4-14 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

3. Level Flatness

Table 4-4. Flatness Relative to 300 MHz

Center Frequency Flatness (dB) CAL Factor

Frequency (MHz)

Measurement

Uncertainty (dB)

300 kHz 0.3 +0.28/00.28

500 kHz 0.3 +0.28/00.28

1 MHz 1 +0.28/00.28

2 MHz 3 +0.28/00.28

5 MHz 3 +0.28/00.28

10 MHz 10 +0.24/00.24

20 MHz 30 +0.24/00.24

50 MHz 50 +0.24/00.24

100 MHz 100 +0.24/00.24

200 MHz 300 +0.24/00.24

300 MHz 300 +0.24/00.24

400 MHz 300 +0.24/00.24

500 MHz 300 +0.24/00.24

600 MHz 300 +0.24/00.24

700 MHz 1000 +0.24/00.24

800 MHz 1000 +0.24/00.24

900 MHz 1000 +0.24/00.24

1000 MHz 1000 +0.24/00.24

1100 MHz 1000 +0.24/00.24

1200 MHz 1000 +0.24/00.24

1300 MHz 1000 +0.24/00.24

1400 MHz 1000 +0.24/00.24

1500 MHz 2000 +0.24/00.24

1600 MHz 2000 +0.24/00.24

1700 MHz 2000 +0.24/00.24

1800 MHz 2000 +0.24/00.24

1900 MHz 2000 +0.24/00.24

2000 MHz 2000 +0.41/00.41

2100 MHz 2000 +0.41/00.41

2200 MHz 2000 +0.41/00.41

2300 MHz 2000 +0.41/00.41

2400 MHz 2000 +0.41/00.41

2500 MHz 3000 +0.41/00.41

2600 MHz 3000 +0.41/00.41

2700 MHz 3000 +0.41/00.41

2800 MHz 3000 +0.41/00.41

2900 MHz 3000 +0.41/00.41

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-15

All manuals and user guides at all-guides.com

4. Harmonic Spurious Outputs

Specication

Harmonic spurious

outputs:

<025 dBc

Related Adjustment

There is no related adjustment for this performance test.

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT 50.

Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's RF

OUTPUT is then connected to the input of an HP 8566A/B spectrum analyzer. The spectrum

analyzer is tuned to dierent frequencies and the amplitude of the second and third harmonics

relative to the fundamental are measured at each frequency.

Figure 4-5. Harmonic Spurious Outputs Test Setup

4-16 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

4. Harmonic Spurious Outputs

Equipment

Microwave spectrum analyzer ....................................... HP 8566A/B

Host spectrum analyzer . . . . . . HP 8560A/E, 8561A/B/E, HP 8562A/B, or HP 8563A/E

Cables

Type N, 62 cm (24 in) . ............................................. HP 11500B/C

BNC, 23 cm (9 in) .................................................... HP 10502A

BNC, 62 cm (24 in)

(3 required)

........................................ 8120-1839

SMA, 52 cm (20 in) . . . ................................................. 5061-9038

Adapter

Type N (m) to BNC (f) . . ............................................... 1250-1476

Procedure

1. Connect the equipment as shown in Figure 4-5. Use the type N cable to connect the

tracking generator RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ .....................................................300 MHz

SPAN ...................................................................0 Hz

RES BW ............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B

, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal level on the host spectrum analyzer

.

5. Set the tracking generator OUTPUT LEVEL vernier knob to 0 dBm. Set the OUTPUT

LEVEL attenuator knob to010 dB.

6.

Press

4

TRIG

5

NNNNNNNNNNNNNNNNNNNN

SINGLE

on the host spectrum analyzer.

Note

It is only necessary to perform step 7 if more than two hours have elapsed

since a front-panel calibration of the HP 8566A/B has been performed. The

HP 8566A/B needs to be allowed to warm up for at least 30 minutes before

proceeding.

7. Perform a front-panel calibration of the HP 8566A/B as follows:

a. Connect a BNC cable between CAL OUTPUT and RF INPUT.

b. Press

4

2022 GHz

5

(INSTR PRESET), then

4

RECALL548

5

.Adjust AMPTD CAL for a marker

amplitude reading of010 dBm.

c. Press

4

RECALL549

5

.Adjust FREQ ZERO for maximum amplitude response.

d. Press

4

SHIFT54FREQUENCY SPAN

5

to start the 30 second internal error correction routine.

e. Press

4

SHIFT54START FREQ

5

to use the error correction factors just calculated.

8. Connect the type N cable from the tracking generator RF OUTPUT to the HP 8566A/B RF

INPUT as shown in Figure 4-5.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-17

All manuals and user guides at all-guides.com

4. Harmonic Spurious Outputs

9. Set the HP 8566A/B controls as follows:

CENTER FREQUENCY .............................................. 300 kHz

SPAN ............................................................... 100 kHz

REFERENCE LEVEL . ...............................................05 dBm

RES BW ............................................................. 30 kHz

10. On the HP 8566A/B do the following:

a. Press

4

PEAK SEARCH

5

and

4

SIGNAL TRACK

5

(ON). Wait for the signal to be displayed at

center screen. Press

4

SIGNAL TRACK

5

(OFF).

b. If the marker frequency is less than 2.5 GHz, press

4

PEAK SEARCH54MKR!CF STEP

5

4

MARKER DELTA

5

.

c. If the marker frequency is greater than 2.5 GHz, press

4

PEAK SEARCH54PRESEL PEAK

5

.Wait

for the

PEAKING!

message to disappear. Then press

4

MKR!CF STEP54MARKER DELTA

5

.

d. Press

4

CENTER FREQUENCY54*

5

to tune to the second harmonic. Press

4

PEAK SEARCH

5

.If

the center frequency value is greater than 2.5 GHz, press

4

PRESEL PEAK

5

and wait for the

PEAKING!

message to disappear. Record the marker amplitude reading in Table 4-5 as

the 2nd harmonic level for the 300 kHz tracking generator output frequency.

e. If the tracking generator output frequency is less than 1 GHz, press

4

CENTER FREQUENCY

5

4*5

on the HP 8566A/B to tune to the third harmonic. Press

4

PEAK SEARCH

5

. If the center

frequency is greater than 2.5 GHz, press

4

PRESEL PEAK

5

and wait for the

PEAKING!

message to disappear. Record the marker amplitude reading in Table 4-5 as the 3rd

harmonic level for the 300 kHz tracking generator output frequency

.

f. On the HP 8566A/B, press MARKER

4

OFF

5

.

11. Repeat steps 9 and 10 for the remaining tracking generator output frequencies listed in

Table 4-5. Note that the host spectrum analyzer's center frequency is the same as the

tracking generator output frequency.

12. Locate the most positive 2nd harmonic level in T

able 4-5 and record the value below.

2nd harmonic level dBc

13. Locate the most positive 3rd harmonic level in T

able 4-5 and record the value below.

3rd harmonic level dBc

Table 4-5. Harmonic Spurious Outputs

Tracking Generator

Frequency

2nd Harmonic

Level (dBc)

3rd Harmonic

Level (dBc)

Measurement

Uncertainty (dB)

300 kHz +1.55/01.80

100 MHz +1.55/01.80

300 MHz +1.55/01.80

900 MHz +1.55/01.80

1.4 GHz N/A +3.45/04.01

4-18 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

all-guides.com

5. Non-Harmonic Spurious Outputs

5. Non-Harmonic Spurious Outputs

Specication

Non-harmonic spurious

outputs:

300 kHz to 2.0 GHz:<0

27 dBc

2.0 GHz to 2.9 GHz:<0

23 dBc

Related Adjustment

There is no related adjustment for this performance test.

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT 50.

Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's RF

OUTPUT is then connected to the input of an HP 8566A/B spectrum analyzer. The tracking

generator is set to various output frequencies.

At each output frequency, several sweeps are taken with an HP 8566A/B at dierent span

settings. The highest displayed spurious output is measured in each span. Responses at the

fundamental frequency of the tracking generator output, or their harmonics

, are ignored. The

amplitude of the highest spurious response is recorded.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-19

All manuals and user guides at all-guides.com

5. Non-Harmonic Spurious Outputs

Figure 4-6. Non-Harmonic Spurious Outputs Test Setup

Equipment

Host spectrum analyzer ......HP 8560A/E, 8561A/B/E, HP 8562A/B, or HP 8563A/E

Microwave spectrum analyzer ....................................... HP

8566A/B

Cables

Type N, 62 cm (24 in)

(2 required)

.................................. HP 11500B/C

BNC, 62 cm (24 in)

(3 required)

........................................ 8120-1839

SMA, 52 cm (20 in) .................................................... 5061-9038

BNC, 23 cm (9 in) . ................................................... HP

10502A

Adapters

Type N (m) to BNC (f) . . . ..............................................

1250-1476

4-20 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

5. Non-Harmonic Spurious Outputs

Procedure

1. Connect the equipment as shown in Figure 4-6. Use the type N cable to connect the

tracking generator's RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ .....................................................300 MHz

SPAN ...................................................................0 Hz

RES BW ............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal level on the host spectrum analyzer.

5. On the tracking generator, set the OUTPUT LEVEL vernier knob to 0 dBm and the OUTPUT

LEVEL attenuator knob to010 dB.

6. On the host spectrum analyzer, press

4

TRIG54SGL SWP

5

.

Note

You need to perform step 8 only if more than 2 hours have elapsed since a

front-panel calibration of the HP 8566A/B has been performed.

The HP 8566A/B should be allowed to warm up for at least 30 minutes before

proceeding.

7. Perform a front-panel calibration of the HP 8566A/B as follows:

a. Connect a BNC cable between CAL OUTPUT and RF INPUT

.

b. Press

4

2022 GHz

5

(INSTR PRESET)

4

RECALL548

5

.Adjust AMPTD CAL for a marker

amplitude reading of010 dBm.

c. Press

4

RECALL549

5

.Adjust FREQ ZERO for a maximum amplitude response.

d. Press

4

SHIFT54FREQUENCY SPAN

5

to start the 30 second internal error correction routine

.

e. Press

4

SHIFT54START FREQ

5

to use the error correction factors just calculated.

8. Connect the type N cable from the tracking generator output to the HP 8566A/B RF INPUT.

See Figure 4-6.

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-21

All manuals and user guides at all-guides.com

5. Non-Harmonic Spurious Outputs

Measure fundamental amplitudes.

9. Set the host spectrum analyzer's center frequency to the fundamental frequency listed in

Table 4-6.

10. Set the HP 8566A/B controls as follows:

SPAN ............................................................... 100 kHz

REFERENCE LEVEL . ...............................................05 dBm

ATTEN . .............................................................. 10 dB

11. Set the HP 8566A/B center frequency to the fundamental frequency listed in Table 4-6.

12. On the HP 8566A/B, press

4

PEAK SEARCH

5

. If the marker frequency is greater than

2.5 GHz, press

4

PRESEL PEAK

5

and wait for the

PEAKING!

message to disappear. Press

4

MKR!REF LVL

5

.Wait for another sweep to nish.

13. Record the HP 8566A/B marker amplitude reading in Table 4-6 as the fundamental

amplitude.

14. Repeat steps 9 through 13 for all fundamental frequency settings in Table 4-6.

Measure non-harmonic responses.

15. On the host spectrum analyzer, set the center frequency to 300 kHz.

16. Set the HP 8566A/B

4

START FREQ

5,4

STOP FREQ

5

, and

4

RES BW

5

as indicated in the rst row of

Table 4-7.

17. Press

4

SINGLE

5

on the HP 8566A/B and wait for the sweep to nish. Press

4

PEAK SEARCH

5

.

If the marker frequency is greater than 2.5 GHz, press

4

PRESEL PEAK

5

and wait for the

PEAKING!

message to disappear.

18. Verify that the marked signal is not the fundamental or a harmonic of the fundamental as

follows:

a. Divide the marker frequency by the fundamental frequency (the host spectrum analyzer

center frequency setting). For example, if the marker frequency is 880 kHz and the

fundamental frequency is 300 kHz, dividing 880 kHz by 300 kHz yields 2.933.

b. Round the number calculated in step a to the nearest whole number

. In the example

above, 2.933 should be rounded to three.

c. Multiply the fundamental frequency by the number calculated in step b.Following the

example, multiplying 300 kHz by three yields 900 kHz.

d. Calculate the dierence between the marker frequency and the frequency calculated in

step c above. Continuing the example, the dierence would be 20 kHz.

e. Due to span accuracy uncertainties in the HP 8566A/B

, the marker frequency might

not equal the actual frequency. Given the marker frequency, check if the dierence

calculated in step d is within the appropriate tolerance:

For marker frequencies<5 MHz, tolerance =6200 kHz.

For marker frequencies<55 MHz, tolerance =6750 kHz.

For marker frequencies>55 MHz, tolerance =610 MHz.

f. If the dierence in step d is within the indicated tolerance, the signal in question is the

fundamental signal (if the number in step b equals 1) or a harmonic of the fundamental

(if the number in step b is greater than 1). This response should be ignored.

19. Press

4

SINGLE

5

on the HP 8566A/B to verify that the marked signal is a true response and

not a random noise peak. Wait for the sweep to complete, then press

4

PEAK SEARCH

5

. A true

4-22 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

5. Non-Harmonic Spurious Outputs

response remains at the same frequency and amplitude on successive sweeps, but a noise

peak does not.

20. If the marked signal is either the fundamental (or a harmonic of the fundamental|see step

18) or a noise peak (see step 19), move the marker to the next highest signal by pressing

4

SHIFT

5

, then

4

PEAK SEARCH

5

. Continue with step 18.

21. If the marked signal is not the fundamental or a harmonic of the fundamental (see step

16) and is a true response (see step 17), calculate the dierence between the amplitude of

marked signal and the fundamental amplitude as listed in Table 4-6.

a. For example, if the fundamental amplitude for a fundamental frequency of 300 kHz is

+1.2 dBm, and the marker amplitude is030.8 dBm, the dierence is032 dBc.

b. Record this dierence as the non-harmonic response amplitude for the appropriate host

spectrum analyzer CENTER FREQ and HP 8566A/B START and STOP FREQ settings in

Table 4-7.

non-harmonic amplitude = marker amplitude0fundamental amplitude

22. If a true non-harmonic spurious response is not found, record \NOISE" as the

non-harmonic response amplitude in Table 4-7 for the appropriate host spectrum analyzer

CENTER FREQ and HP 8566A/B START and STOP FREQ settings.

23. Repeat steps 17 through 22 for the remaining HP 8566A/B settings for ST

ART FREQ, STOP

FREQ, and RES BW for the host spectrum analyzer CENTER FREQ setting of 300 kHz.

24. Repeat steps 16 through 23 with the host spectrum analyzer CENTER FREQ set to 1.5 GHz.

25. Repeat steps 16 through 23 with the host spectrum analyzer CENTER FREQ set to 2.9 GHz.

26. Locate in Table 4-7 the most-positive non-harmonic response amplitude for HP 8566A/B

STOP FREQ settings of2000 MHz. Record this amplitude below:

Non-harmonic response amplitude (2000 MHz) dBc

27. Locate in Table 4-7 the most-positive non-harmonic response amplitude for the HP 8566A/B

START FREQ settings2000 MHz. Record this amplitude below:

Non-harmonic response amplitude (2000 MHz) dBc

Table 4-6. Fundamental Response Amplitudes

Fundamental Frequency Fundamental

Amplitude (dBm)

300 kHz

1.5 GHz

2.9 GHz

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-23

All manuals and user guides at all-guides.com

all-guides.com

5. Non-Harmonic Spurious Outputs

Table 4-7. Non-Harmonic Spurious Responses

HP 8566A/B Settings Non-Harmonic Response Amplitude

(dBc)

Measurement

Uncertainty

Start Stop RES at 300 kHz at 1.5 GHz at 2.9 GHz

Frequency Frequency BW CENTER FREQ CENTER FREQ CENTER FREQ (in dB)

(in MHz) (in MHz)

0.3 5.0 30 kHz +1.55/01.80

5.0 55 100 kHz +1.55/01.80

55 1240 1 MHz +1.55/01.80

1240 2000 1MHz +1.55/01.80

2000 2900 1 MHz +3.48/04.01

4-24 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

6. LO Feedthrough Amplitude

6. LO Feedthrough Amplitude

Specication

LO feedthrough:<0

26 dBm with output level vernier knob set to 0 dBm and

attenuator knob set to010 dB.

Related Adjustment

There is no related adjustment for this performance test.

Description

The tracking generator's RF OUTPUT is connected to the host spectrum analyzer's INPUT 50.

Tracking is adjusted at 300 MHz for a maximum signal level. The tracking generator's RF

OUTPUT is then connected to the input of an HP 8566A/B spectrum analyzer. The tracking

generator is tuned to several frequencies and the LO feedthrough is measured at each

frequency.

Figure 4-7. LO Feedthrough Test Setup

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-25

All manuals and user guides at all-guides.com

6. LO Feedthrough Amplitude

Equipment

Host spectrum analyzer ......HP 8560A/E, 8561A/B/E, HP 8562A/B, or HP 8563A/E

Microwave spectrum analyzer ....................................... HP 8566A/B

Cables

Type N, 62 cm (24 in)

(2 required)

.................................. HP 11500B/C

BNC, 62 cm (24 in)

(3 required)

........................................ 8120-1839

SMA, 52 cm (20 in) .................................................... 5061-9038

BNC, 23 cm (9 in) . ................................................... HP 10502A

Adapters

Type N (m) to BNC (f) . . . .............................................. 1250-1476

Procedure

1. Connect the equipment as shown in Figure 4-7. Use the type N cable to connect the

tracking generator's RF OUTPUT to the host spectrum analyzer's INPUT 50.

2. Press

4

PRESET

5

on the host spectrum analyzer and set the controls as follows:

CENTER FREQ .....................................................300 MHz

SPAN ...................................................................0 Hz

RES BW ............................................................. 300 Hz

3. If the host spectrum analyzer is an HP 8561A, HP 8562A, or HP 8562B

, press

4

SWEEP

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PNL OUTPUT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

If the host spectrum analyzer is an HP 8560A/E, HP 8561B/E, or HP 8563A/E, press

4

AUX CTRL

5

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

REAR PANEL

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

.5 V/GHz (FAV)

.

4. On the tracking generator, set the OUTPUT LEVEL vernier knob to05 dBm. Set the

OUTPUT LEVEL attenuator knob to 0 dB, then adjust TRACKING ADJUST to display a

maximum signal level on the host spectrum analyzer

.

Note

It is only necessary to perform step ve if more than two hours have elapsed

since a front-panel calibration of the HP 8566A/B has been performed.

The HP 8566A/B should be allowed to warm up for at least 30 minutes before

proceeding.

5. Perform a front-panel calibration of the HP 8566A/B as follows:

a. Connect a BNC cable between CAL OUTPUT and RF INPUT

.

b. Press

4

2--22 GHz

5

(INSTR PRESET)

4

RECALL548

5

.Adjust AMPTD CAL for a marker

amplitude reading of010 dBm.

c. Press

4

RECALL549

5

.Adjust FREQ ZERO for a maximum amplitude response.

d. Press

4

SHIFT54FREQUENCY SPAN

5

to start the 30 second internal error correction routine.

e. Press

4

SHIFT54START FREQ

5

to use the error correction factors just calculated.

6. Connect the type N cable from the tracking generator output to the HP 8566A/B RF INPUT

.

See Figure 4-7.

7. Set the tracking generator OUTPUT LEVEL vernier knob to 0 dBm and the OUTPUT

LEVEL attenuator knob to010 dB. Set the host spectrum analyzer CENTER FREQ to

300 kHz.

4-26 Performance Tests

HP 85640A RF Tracking Generator Operation and Service Manual

All manuals and user guides at all-guides.com

6. LO Feedthrough Amplitude

8. Set the HP 8566A/B controls as follows:

CENTER FREQUENCY ............................................ 3.911 GHz

SPAN ............................................................... 100 kHz

REFERENCE LEVEL ..................................................0 dBm

RES BW .............................................................. 1 kHz

9. On the HP 8566A/B, press

4

PEAK SEARCH54SIGNAL TRACK

5

(ON). Wait for the signal to be

centered on the display. Press

4

SIGNAL TRACK

5

(OFF).

10. On the HP 8566A/B, press

4

PEAK SEARCH54PRESEL PEAK

5

.Wait for the

PEAKING!

message to

disappear.

11. Record the HP 8566A/B marker amplitude below:

LO feedthrough (at 3.911 GHz) dBm

(Measurement uncertainty:<+2.02/02.50 dB)

12. Set the host spectrum analyzer CENTER FREQ to 2.9 GHz.

13. Set the HP 8566A/B CENTER FREQUENCY to 6.8107 GHz.

14. On the HP 8566A/B, press

4

PEAK SEARCH54SIGNAL TRACK

5

(ON). Wait for the signal to be

centered on the display. Press

4

SIGNAL TRACK

5

(OFF).

15. On the HP 8566A/B, press

4

PEAK SEARCH54PRESEL PEAK

5

.Wait for the

PEAKING!

message to

disappear.

16. Record the HP 8566A/B marker amplitude below:

LO feedthrough (at 6.8107 GHz) dBm

(Measurement uncertainty:<+2.10/02.67 dB)

HP 85640A RF Tracking Generator Operation and Service Manual

Performance Tests 4-27

All manuals and user guides at all-guides.com