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HfFUJL~TT-94CiCF)&.D

TRACKING GENERATOR

8444A

Serial Numbers Prefixed
This manual applies directly to serial numbers
prefixed 1147A.
With modifications described in Section VII this
manual also applies to serial numbers prefixed
1033A and 1139A.
For instruments with serial number prefixes not
listed, a "Manual changes" insert is included with
this manual.
For additicuial information about serial numbers
see "Instruments Covered by Manual" in Section I.

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lpwati~ Supplement ParI NO. ow444om2

HEWLETT !/I t PACKARD
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COPYRIGHT AND DISCLAIMER NOTICE

Copyright - Agilent Technologies, Inc. Reproduced with the permission of Agilent
Technologies Inc. Agilent Technologies, Inc. makes no warranty of any kind with regard
to this material including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose. Agilent Technologies, Inc. is not liable for errors
contained herein or for incidental or consequential damages in connection with the
furnishing, performance, or use of this material or data.
Table of Contents Model 8444A

TABLE OF CONTENTS

Section Page Section Page
GENERALINFORMATION 1-l 4.9. Preset Adjustments (8555A/8552B/
l-l. I,ntroduction 1.1 141T/8444ASystem) 4-2
l-5. Instruments Covered by Manual 1-l 4-11. Performance Tests 4-2
1.7. Description 1-l 4.16. Output Level : 4-3
1.10. 8554L RF Section Modifications 1.3 4.17. Frequency Stability 4-6
1.12. Accessories Supplied. 1.3 4.18, system Flatness 4-9
1.14. Operating Accessories 1-3 4-19. Frequency Accuracy 4-11
1.16,Test Equipment Required 1-3 4-20. Harmonic Distortion 4-13
1.18. Warranty l-3
INSTALLATION 2-l
2-l. Initial Inspection 2.1 V ADJUSTMENTS t 5.1
2.2. Mechanical Check : 2-l 5-l. Introduction 5"l
2.4. Electrical Check : : 2.1 5.4. Equipment Required 5-l
2-6. Claims PoorDamage 2.1 5.6. Factory SelectedComponents 6"l
2.9. Preparation for Use 2-l 5.8. Power Supply, Check and
2.10 Power Requirements 2.1 Adjustment , , 5.1
2"13. Power Cable 2.1 5.9. 1.55 GHz Oscillator Power Level,
2.16. Operating Environment 2.1 Frequency Check&Adjustment 5-3
2.18. Installation Connections 2"2 5-10. 1.55 GHz Oscillator Residual
2"21. Storage and Shipment 2.2 FMCheck t 5~6
2.22. Original Packaging 2-2, 5.11. First Converter Check and
2-26. Other Packaging Materials 2-2 Adjustment 5"9
5-12. Automatic Level dot&~ (AL;)
OPERATION 3-l Check and Adjustment 8"ll
3.1. Introduction 3.1 5.13. Level Control Calibration Check
3.3. Panel Features 3.1 and Adjustment 5-13
3.5. Operator's Checks 3-1 VI REPLACEABLE PARTS t 6-l
3-l. Operating Instructions 3.1
6.1. Introduction 6.1
3.9. Controls, Indicators and Connectors 3-l
6.5. Ordering Information 6-1
3-11.. Operating Techniques 3-l
3.13. Crystal Filter Measurement 3.8 VII MANUALCHANGES 7.1
3.15. Bandpass Filter Measurement 3-8 1.1. current Instruments 1~1
3-17. LowBass Filter Measurement 3.8 7.3. Older Instruments. t t l-l
3.19. Swept Return Loss Measurement 3.9 7.5, Newerlnstnrments 7.1
3-21. Amplifier Gain and Bandwidth
Measurement 3.9 VIII SERVICE 8.1
3-23. Precision Frequency Measurements 3"9 8.1
8.1. Introduction
8.3. Principlesof Operation 8-l
8.5. Recommended Test Equipment 8.1
PERFORMANCETESTS 4.1 8.7. Troubleshooting 8.1
4.1. Introduction 4.1 8.11. Repair 8.1
4-3. Equipment Required 4-l 8.20. General Service Hin.ts 8-2
4-5. Front Panel Checks t 4.1 8.23. General Service Information 8.4
4.1. Preset Adjustments (8654L/8552B 8.28. Operational Amplifiers t 8.5
/141T/8444A System) 8.31. Electrical Maintenance 8.6
Model S444A Table of Contents

LIST OF ILLUSTRATIONS

Figure Page Figure
Model 8444A Tracking Generator and 5-6. First Converter Passband CRTDisplay 5.10
Accessories 1-O 5.7. Automatic Level Control (ALC) Check and
Instrument Identification 1.1 Adjustment Test Setup 5.11
Power Cable Line Connector Labels 2.2 5-8. Level Control Calibration Check and Adjust-
Model 8444A Tracking Generator Front Panel ment Test Setup 5-13
Controls, Indicators and Connectors 3-2 8-l. Transistor Operation . 8.5
3-2. Model 8444A Tracking Generator Rear Panel 8~2. Examples of Diode and Transistor Marking
Controlsand Connectors 3-3 Methods. 8-6
Tracking Generator Operation with 8554L 8-3. Operational Amplifier Equivalent Circuit S-7
Spectrum Analyzer 3.4 8-4. 8444A Tracking Generator Top and Bottom
Tracking Generator Operation with 8565A Internal Views. `. 8-9
Spectrum Analyzer 3-6 8.5. Adjustment and Test Point Locations 8-9
3-5. 20 MHz Crystal Filter CRT Display . 3-8 8-6. Tracking Generator Spectrum Analyzer,
3.6. 50 MHz Bandpass Fitler CRT Display 3.8 Simplified Block Diagram 8~10
3.1. 23 MHz Low-Pass Filter CRT Display 3.9 S-i'. Tracking Generator Block Diagram with
3.8. Swept Return Loss Measurement Spectrum Analyzer Interconnections 8-11
CRT Display 3.9 S-8. Tracking Generator Troubleshooting
3-9. Amplifier Gain and Bandwidth CRT Display a-9 Block Diagram 8.13
3.10. Precision Frequency Measurement 8.9. Mixer Diode Forming Dimensions in Inches 8-14
CRT Display 3-10 8.lO.Modulator/Oscillator Driver Assy A2
4~1. Output Level Accuracy Test Setup . 4.3 Component Locations 8-15
4-2. Residual FM Test Setup 4-l 8.11,Amplifier and Pin. Diode Modulator Assy
4.2. Demodulation Sensitivity Measurement. 4.8 A4Al Component Locations 8-15
4.4. Amplitude Accuracy Test Setup t 4-9 8.12. First Converter Circuits
4"5. Frequency Accuracy Test Setup . 4-11 Schematic Diagram t , 8.15
46 Harmonic Distortion Test Setup 4.13 8.13. Jl RF Output Connector, Exploded View, 8"16
4.1. Typical Harmonic Distortion CRT Display 8.14. A2 Modulator/Oscillator Driver Assy,
OtolooMHz. 4-15 Component Location 8.17
4-8. Typical Harmonic Distortion CRT Display 8.15. Second Converter Circuits,
Oto500MHt,. t 4.15 Schematic Diagram 8.17
5.1. Power Supply Check and Adjustment S-16. Al Power Supply Assy, Component Location 8.19
Test setup 5.2 8.17. Power Supply and Input Circuit,
5-2. 1.55 GHz LO Power Level and Frequency Schematic Diagram 8-19
Check and Adjustment Test Setup 5-4 8-18. A5 First Converter Assembly
6-3. 1.55 GHz LO Residual FM Check Test Setup. 5.6 IllustratsdPartsBreakdown 8~20
5.4. Demodulation Sensitivity Measurement. 5.8 8.19. A7 1.55 GHz Oscillator Assembly
5-5. First Converter Check and Adjustment Test Setup. 5.9 Illuctiated PartsBreakdown 8-21

LIST OF TABLES
Table Page Table Page
1-l. System Specifications ,. 1.2 6-l. Abbreviations and Reference Designators
l-2. Accessories Supplied 1.3 Used in Parts List. , , 6.1
1.3. Test Equipment and Accessories 1-4 6.2. Replaceable Parts 6-2
6-3. Code List of +nufacturers, 6.6
8.1. Factory Selected Components.
l-4. Operating Accessories 1.6 8.2. Adjustable Components .i : 8-2
8.2
4-l. PerformanceTest Record 4.16 8-3. Schematic Diagram Notes , 8-3
5.1. Check and Adjustment Test Card. 5-15 8.4. Etched Circuit Soldering Equipment. 8.4
General Information Model 8444A

MODEL 8444A

08444.60018
(3)

Figure 1-l. Model 8444A Tracking Generator and Accessories
Model 8444A General Information

SECTION I
GENERAL INFORMATION

`i-1. INTRODUCTION instrument. When the instrument serial number
prefix is,not listed on the inside title pageof initial
I-2. This manual contains all information required issue, manual change sheets and manual up-dating
to install, operate, test, adjust and service the information is provided. Later editions or revisions
Hewlett-Packard Model 8444A Tracking Genera- to the manual will contain the required change
tor. This section covers instrument identification, information in Section VII.
description, options, accessories,specifications and
other basic information.
1.3. Figure 1-1 shows the Hewlett-Packard Model SERIAL PREFIX SERIAL NUMBER
8444A Tracking Generator with accessoriessup- \ /
plied.
1-4. The various sections in this manual provide
information as follows:
SECTION II, INSTALLATION, provides infor-
mation relative to incoming inspection, power
requirements, mounting, packing and shipping,
etc.
SECTION III, OPERATION, provides informa- Figure 1-2. Instrument Identification
tion relative to operating the instrument.
SECTION IV, PERFORMANCE'TESTS, pro-
vides information required to ascertain that the
instrument is performing in accordance with 1-7. DESfXlPTlON
published specifications.
I-8. The Model 8444A Tracking Generator is
SECTION V, ADJUSTMENTS, provides infor- designed to complement both Model- and
mation required to properly adjust and align Model 8555A Spectrum Analyzer RF Sections.
the instrument after repairs are made. The Tracking Generator covers the frequency range
of 500 kHz to 1250 MHz when used with the
SECTION VI, REPLACEABLE PARTS, pro- 85542 RF Section and from 10 MHz to 1.3 GHz
vides ordering information for all replaceable when used with the 8655A RF Section. The
parts and assemblies. Tracking Generator/Spectrum Analyzer functions
as a system to perform frequency responsemeas-
SECTION VII, MANUAL CHANGES, nor- urements. Additionally, the system can be used as
mally will contain no relevant information in a signal generator or sweeperto supply a test signal
the original issue of a manual. This section is to other devices. An auxilliary output is,,provided
reserved to provide backdated and updated for precision frequency measurementsby`an exter-
information in manual revisions or reprints. nal frequency counter.
SECTION VIII, SERVICE, includes all infor-
mation required to servicethe instrument. 1-9. The Tracking Generator converts the first and
thii local oscillator (LO) signals, from the Spec-
I-5. INSTRUMENTS COVERED BY MANUAL trum Analyzer RF Section, to a signal that tracks
the frequency tuning of the RF Section. With the
l-6. Hewlett-Packard instruments carry a serial Spectrum Analyzer operating in ZERO SCAN
number (see Figure 1-2) on the back panel. When WIDTH, the Tracking Generator is a CW signal
the serial number prefix on the instrument serial ~cnerntor. tuned to the frequency of the analyzer.
~_."_" _._., _-_^_- ~.
number plate of your instrument is the same as one In FllT,L or PER Dl[VISION SCAN WIDTH the
of the prefix numbers on the inside title page of Tracking Generator functions as a sweep oscillator
this manual, the manual applies directly to the which tracks the anaIyzer tuning. Additionally, a