TM-11-6625-2781-14-1
TM 11-6625-2781-14-1
TECHNICAL MANUAL
OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL
SUPPORT MAINTENANCE MANUAL
FOR
PLUG-IN UNIT, ELECTRONIC TEST EQUIPMENT PL1388/U
(HEWLETT-PACKARD MODEL 8552B)
(NSN 6625-00-431-9939)
HEADQUARTERS,
DEPARTMENT OF THE ARMY
18 SEPTEMBER 1978
This manual contains copyright material reproduced by Permission of the Hewlett-Packard Company.
TM 11-6625-2781-14-1
T ECHNICAL M ANUAL
No.
HEADQUARTERS
DEPARTMENT OF THE ARMY
W ASHINGTON , DC 18 September 1978
11-6625-2781-14-1
OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUAL
FOR
PLUG-IN UNIT, ELECTRONIC TEST EQUIPMENT PL-1388/U
(HEWLETT-PACKARD MODEL 8552B)
(NSN
6625-00-431-9939)
REPORTING OF ERRORS
You can improve this manual by recommending improvements using DA Form 2028-2 located in
the back of the manual. Simply tear out the self-addressed form, fill it out as shown on the sample,
fold it where shown, and drop it in the mail.
If there are no blank DA Forms 2028-2 in the back of your manual, use the standard DA Form
2028 (Recommended Changes to Publications and Blank Forms) and forward to the Commander, US
Army Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-MA-Q, Fort
Monmouth, NJ 07703.
In either case a reply will be furnished direct to you.
This manual is an authentication of the manufacturer’s commertial literature which, through usage, has been found to cover
the data required to operate and maintain this equipment. Since the manual was not prepared in accordance with military
specifications, the format has not been structured to consider levels of maintenance.
i
TM 11-6625-2781-14-1
Mode1 8552B
Table of Contents
CONTENTS
Page
Section
Section
0
INTRODUCTION OOOOOO 0-1
ADJUSTMENTS (cont’d)
V
GENERAL INFORMATION l l l l s l 1-1
I
HP 11592A Service Kit. . . . . . 5-1
5-11.
1-1. Introduction . . . . . . . . . . 1-1
Extender Cable Installation . . . . 5-1
5-14.
1-8. Instruments Covered by Manual . . . . 1-1
Plug-in Cover Removal . . . . . . 5-1
5-17.
1-12. Description . . . . . . . . . . 1-2
Extender Connections . . . . . . 5-2
5-19.
l-16. Options. . . . . . . . . . . . 1-2
5-22. Factory Selected Components . . . . 5-2
1-21. Equipment Required but not Supplied . 1-2
5-24. Related Adjustments . . . . . . . 5-2
RF Section. . . . . . . . . . 1-2
1-23.
5-26. Checks and Adjustments . . . . . . 5-3
Display Section . . . . . . . . 1-2
1-25.
Power Supply Check and Adjustment . 5-3
5-27.
1-27. Equipment Available . . . . . . . 1-4
Horizontal Scan Check and Adjustment 5-4
5-28.
1-29. Recommended Test Equipment . . . . 1-4
5-29.
Final Scan Check . . . . . . . . 5-6
II
INSTALLATION . . . . . . . . . . . 2-1
Vertical Deflection Amplifier Check . 5-8
5-30.
2-1. Shipping Information . . . . . . . 2-1
5-31.
Log/Linear Amplifier Check and
2-3. Initial Inspection . . . . . . . . . 2-1
Adjustment . . . . . . . . 5-11
Mechanical Check . . . . . . . 2-1
2-4.
300 kHz Bandpass Filter Adjustment . 5-14
5-32.
Performance Check . . . . . . . 2-1
2-6.
LC Filter Adjustment . . . . . . 5-15
5-33.
2-8. Claims for Damage . .!. . . . . 2-1
Crystal Filter Fine Adjustment . . . 5-16
5-34.
2-10. Power Requirements. . . . . . . . 2-1
Crystal Filter Coarse Adjustment . . 5-20
5-35.
2-1
2-12. Connections . . . . . . . . .
3 MHz IF Gain Adjustment . . . . 5-22
5-36.
2-14. Installation Check . . . . . . . . 2-1
5-37.
47 MHz LO Automatic Phase Lock
2-16. Storage and Shipment . . . . . . . 2-1
Check and Adjustment . . . . . 5-25
Original Packaging . . . . . . . 2-1
2-17.
5-38.
50 MHz IF Bandpass Check and
Other Packaging Materials . . . . , 2-1
2-21.
Adjustment . . . . . . . . 5-29
3-1
III OPERATION . . . . . . . . . .
44 MHz Rejection Adjustment . . . 5-32
5-39.
3-1
3-1. Introduction . . . . . . . .
30 MHz Calibration ,Oscillator
5-40.
3-1
. . .
3-3. Panel Features
Check and Adjustment . . . . . 5-34
3-1
3.5. Operator’s Checks : : : . . .
Analogic Check and Adjustment. . . 5-37
5-41.
3-1
3-8. Operational Adjustments . . . .
3-1
H01/H02 Instruments . . . .
DELETED
REPLACEABLE PARTS
VI
3-10.
3-1
H04 Instruments . . . . . . .
3-12.
3-1
3-14. Operating Instructions . . . . .
VII MANUAL CHANGES . . . . . . . . 7-1
3-1
. . . .
3-16. Operating Tips
7-1. Introduction . . . . . . . . . . 7-1
3-2
3-19. Operator’s Maintenance - . . . .
7-5. Manual Change Instructions . . . . . 7-4
IV PERFORMANCE TESTS . . . . . . . . 4-1
4-1. Introduction . . . . . . . . . . 4-1
VIII SERVICE . . . . . . . . . . . . .8-1
4-5. Front Panel Checks . . . . . . . , 4-1
8-1. Introduction . . . . . . . . . . 8-1
4-7. Performance Teats . . . . . . . . 4-1
8-3. Line Voltage Requirements . . . . . 8-1
4-1
4-12, Front Panel Check Procedure . . . . ,
8-5. Maintenance Aids . . . . . . . . 8-1
preset Adjustments . . . . . . , 4-1
4-13.
8-7. Test Equipment and Accessories Required. 8-1
Display Section Adjustments . . ! . 4-2
4-16.
8-10. Adjustments . . . . . . . . . . 8-2
IF Section Display Adjustments . ~ . . 4-2
4-17.
8-12.
General Procedures . . . . . . . . 8-2
4-3
Ampl Cal Adjustment RF Section . .
4-18.
8-15. General Service Information . . . . . 8-2
Ampl Cal Check for Linear
4-19.
8-23. Etched Circuits . . . . . . . . . 8-2
Sensitivity Accuracy. . . . . . 4-3
8-26. Component Replacement . . . . . . 8-4
Calibrator Output. . . . . . . . 4-5
4-23.
8-27.
Transistor Replacement . . . . . 8-5
4-7
Bandwidth
Accuracy.
.
.
.
.
.
.
4-24.
Diode Replacement . . . . . . . 8-6
8-31.
Bandwidth Selectivity . . . . , . 4-9
4-25.
8-33.
Switching
Information . . . . . . . 8-6
Switching Between Bandwidths
4-26.
Accuracy . . . . . . . . . 4-11
SERVICE SHEETS
Amplitude Display Accuracy . . . . 4-12
4-27.
Block Diagram . . . . . . . . . 8-20
1.
Scan Time Accuracy. . . . . . . 4-13
4-28.
RF Section/IF Section/Display Section
2.
Interconnections . . . . . . . . 8-22
V
ADJUSTMENTS . . . . . . . . . . . 5-1
50 MHz Converter . . . . . . . . 8-24
3.
47 MHz Automatic Phase Control and
4.
5-1. Introduction . . . . . . . . . . 5-1
2 MHz Voltage Tuned Oscillator. . . 8-26
5-3. Equipment Required . . . . . . . 5-1
2 MHz VTO Shaping Circuit . . . . . 8-28
5.
Posidriv Screwdriver . . . . . . 5-1
5-5.
3 MHz Amplifier (Sheet 1). . . . . . 8-30
6.
5-7.
Slug Tuning Tools . . . . . . . 5-1
7.
3 MHz Amplifier (Sheet 2). . . . . . 8-32
5-9.
Blade Tuning Tools . . . . . . . 5-1
ii
TM 11-6625-2781-14-1
Table of Contents
Model 8552B
CONTENTS (cont’d)
SERVICE SHEETS (cont’d)
8.
9.
10.
11.
12.
13.
LC Bandwidth Filter . . . . . , . .
Amplifier Filter Control Circuits. . . . .
Crystal Filter (Sheet 1) . . . . . . . .
Crystal Filter (Sheet 2) . . . . . . . .
Log/Linear Amplifier (Sheet 1) . . . . .
Log/Linear Amplifier (Sheet 2) . . . . .
8.34
8.36
8-38
8.40
8.42
8-44
14.
15.
16.
17.
18.
Deflection Amplifier . . . . . . . . .8-46
Scan Generator and Trigger Circuits . . . .8-48
Scan Driver and Pen Lift Driver . , . . . .8-50
Analogic Circuit . . . . . . .
8-52
Reference Oscillator & LOG REFERENCE
Index Light Circuit . . . . . . . . .8-54
19. Power Supply . . . . . . . . . . . .8-56
ILLUSTRATIONS
Figure
Page
Figure
Page
1-0
1-1. Model 8552B Spectrum Analyzer IF Section
7-9. Log/Linear Amplifier Partial Schematic
1-2. HP 11592A Service Kit Required
(Part of Change U) . . . . . . . . . 7-19
for Maintenance . . . . . . . . . . 1-7
7-10. Log/Linear Amplifier Partial schematic
2-1. Model 8552B Spectrum Analyzer IF Section
(Part of Change U) . . . . . . . . . 7-19
with 8553B RF Section and 141T
7-11.50 MHz Converter
Display Section . . . . . . . . . . 2-0
(Part of Change X) . . . . . . . . . 7-24
7-12. Power Supply Partial Schematic
3-1. 82552B Spectrum Analyzer IF Section Controls,
(Part of Change Y) . . . . . . . . . 7-25
Indicators and Connectors. . . . . . . 3-3
8-1. 8552B IF Section with Circuit Board
4-1. 30 MHz Calibrator Signal& Harmonica . . . 4-2
Extended for Maintenance. . . . . . . 8-1
4-2. Vertical Gain Adjustment . . . . . . . . 4-2
8-2. Diagram of Modular Exchange Program . . . 8-3
4-3. Calibrator Amplitude Test Setup . . , . . 4-5
8-3. Examples of Diode and Transistor
4-4. Calibrator Frequency Check Test Setup . . . 4-7
Marking Methods. . . . . . . . . . 8-5
4-5. 10 kHz Bandwidth Accuracy Test Setup , . . 4-8
8-4. Integrated Circuit Packaging . . . . . . . 8-6
4-6. Scan Time Accuracy Teat Setup . . . . . , 4-13
8-5. Evolution of Straight-Line Switch presentation . 8-7
4-7. Scan Time Modulation Peaks .‘ . . . . . . 4-14
Three Positions of Typical Switch Wafers . . . 8-7
8-6.
5-1. Power Supply Check & Adjustment Test Setup . 5-3
8-7. Wafer Switch Presentation Versus
5-2. Scan Generator Check& Adjustment Teat Setup. 5-4
Straight-Line Presentation . . . . . , . 8.8
5-3. Scan Voltage Waveform Measurement . . . . 5-5
8-8.
8553B
Component, Assembly and
5-4. Final Scan Time Adjustment Test Setup . . , 5-6
Adjustment
Locations . . . . . . , . 8-19
5-5. Vertical Deflection Amplifier Teat Setup . . . 5-9
8-9. Simplified Block Diagram . . . . . , . . . 8-20
5-6. Log/Linear Amplifier Check and Adjustment
8-10. 8552B Block Diagram . , . . . . . ,
8-21
Test Setup . . . . . . . . . . . . 5-11
8-11.
Video
Filter
Assembly
All,
.
.
.
,
.
.
8-22
5-7. Crystal Filter Fine Adjustment Test Setup . . 5-17
8-12. Log Reference Level Switch Assembly A10 ,
5-8. Crystal Filter Bypass Network . . . . . . 5-21
8-22
5-9. 3 MHz IF Gain Adjustment Test Setup . . , 5-22
8.13. Scan Time Switch Assembly A9 . . . . . .
8-22
5-10.47 MHz LO Automatic Phase Lock Test Setup . 5.26
8.14. RF Section/IF Section/Display Section
Interconnections . . . . . , . . .
5-11. Search Waveform , . . . . . . . . . . 5.28
8-23
8-15. 50 MHz Bandpass Filter A3A1,
6.12.50 MHz IF Bandpass Adjustment Teat Setup, . 5-30
Component Identification, . . . . , . 8-25
5-13.50 MHz Bandpass Display for 10 MHz
8-16. 47 MHz LO A3A2 Component Identification
and 3 MHz Sweeps . . . . . . , . . 5-31
8-25
8-17. 50 MHz Converter A3 Component
5-14.50 MHz Bandpass Flatness Display . . . . . 5-32
Identification, . , . , . . . . . . 8-25
5-15.44 MHz Rejection Adjustment Test Setup . . 5-33
8-18. 50 MHz Converter, Schematic Diagram. . ,
8-25
5-16.30 MHz Calibration Amplitude Adjustment
setup . . . . . . . . . . . .. 5-35
8-19. 47 MHz APC A1 2 Component Identification.
8-27
7-1. Power Supply Partial Schematic
8-20. 2 MHz VTO A13 Component Identification .
8-27
(Part of Change F) . . . . . . . . . 7-5
8-21. 47 MHz Automatic Phase Control and
7-2. Deflection Amplifier A7 Component
2 MHz Voltage Tuned Oscillator. . . .
8-27
Identification (Part of Change H) . . . . 7-12
8-22. P/O Power Supply A5 Component
7-3. Deflection Amplifier (Part of Change H) . . . . 7-13
Identification , . . . . . . . . , . 8-29
7-4. Log/Linear Amplifier Partial
8-23. 2 MHz VTO Shaping Circuit . . , . . . . 8-29
Schematic (Part of Change J) . . . . . . 7-14
8-24 P/O 3 MHz Amplifier A2 Component
7-5. Log/Linear Amplifier Partial
Identification . . . . . . . . . . . 8-31
Schematic (Part of Change J) . . . . . . 7-14
8-25. 3 MHz Amplifier (Sheet 1 of 2) . , . . . . 8-31
7-6. Deflection Amplifier A7
8-26. P/O 3 MHz Amplifier A2 Component
Component Identification (Part of Change O). 7-16
Identification . . . . . . . . . . . 8-33
7.7. Deflection Amplifier Partial Schematic
8-27. 3 MHz Amplifier (Sheet 2 of 2) . . . . . . 8-33
(Part of Change O) . . . . . . . . . 7.17
8-28. LC Filter A1 Component Identification . . . 8-35
7-8. Deflection Amplifier Partial Schematic
8-29. LC Bandwidth Filter . . . . . . , , . 8-35
(Part of Change O) . . . . . . . . . 7-17
8-30. Amplifier/Filter Control Circuits . . . . . 8-37
iii
TM 11-6625-2781-14-1
Table of Contents
Model 8552B
ILLUSTRATIONS (cont’d)
Page
Figure
8-31. P/O Crystal Filter A4 Component
Identification . . . . . . . . . . 8-39
8-32. Crystal Filter (1 of 2) . . . . . . . . 8-39
8-33. P/O Crystal Filter A4
Component Identification . . . . . . 8-41
8-34. Crystal Filter (2 of 2) . . . . . . . . 8-41
8-35. Simplified Diagram, Log Mode of Operation . 8-42
8-36. P/O Log/Linear Amplifier A8
Component Identification . . . . . . 8-43
8.37. Log/Linear Amplifier (1 of 2) . . . . . 8-43
8-38. P/O Log/Linear Amplifier A8,
Component Identification . . . . . . 8-45
8-39. Log/Linear Amplifier (2 of 2) . . . . . 8-45
8-40. Deflection Amplifier A7
Component Identification , . . . . . 8-47
8-41. Deflection Amplifier . . . . . . . . 8-47
Page
Figure
8-42. P/O Scan Generator A6
Component Identification . . . . . .
8-43. Scan Generator and Trigger Circuits . . .
8-44. P/O Scan Generator A6
Component Identification . . . . . .
8-45. Scan Driver and Pen Lift Driver . . . . .
8-46. P/O Power Supply AS
Component Identification . . . . . .
8-47. Analogic Circuit . . . . . . . . . .
8-48. P/O Scan Generator A6
Component Identification . . . . . .
8-49. Reference Oscillator and LOG REFERENCE
Index Light Circuit . . . . . , . .
8-50. P/O Power Supply AS
Component Identification . . . . . .
8-51. Power Supply . . . . . . . . , . .
8-49
8-49
8-51
8-51
8-53
8-53
8-55
8-55
8-57
8-57
TABLES
Page
Table
1-1.
1-2.
4-1.
4-2.
4-3.
4-4.
4-5.
5-1.
5-2.
5-3.
5-4.
5-5.
8552B Specifications . . . . . . . . .
Test Equipment and Accessories. . . . . .
Front Panel Checks . . . . . . . . . .
Bandwidth Checks . . . . . . . . . .
Bandwidth Selectivity Checks . . . . . .
Modulation Frequencies for Checking Scan Time
Performance Check Test Record. . . . . .
Modulation Frequencies for Checking Scan Time.
Analogic Threshold Adjustment . . . . . .
Display Calibration Conditions . . . . . .
Factory Selected Components . . . . . .
Check and Adjustment Test Record . . . .
1-3
1-4
4-4
4-8
4-10
4-14
4-15
5-7
5-37
5-38
5-39
5-40
Table
Page
7-1.
7-2.
7-3.
7-4.
8-1.
8-2.
8-3.
8-4.
8-5.
Manual Changes by Serial Number . . . . 7-1
Summary of Changes by Component . . . 7-2
Replaceable Parts (Part of Change H) . . . 7-10
Replaceable Parts (Part of Change X) . . . 7-22
Etched Circuit Soldering Equipment . , . 8-4
System Test and Troubleshooting Procedure . 8-9
Schematic Diagram Notes . . . . . . . 8-16
IF Section Assy & Component Location . . 8-17
Gain Changes when LOG REF LEVEL Switch
is Adjusted. . . . . . . . . . . 8-21
8-6. IF-to-RF Sections Interconnecting Jack
Identification . . . . . . . . . . 8-23
8-7. IF-to-Display Sections Interconnecting
Plug Identification . . . . . . . . 8-23
APPENDIXES
A.
B.
C.
D.
E.
iv
R E F E R E N C E
. o o c .
o e e e .
c
. . .
o o o
.
.
.
. . e
l
COMPONENTS OF END ITEM LIST
(Not Applicable)
ADDITIONAL AUTHORIZATION LIST (Not Applicable)
MAINTENANCE ALLOCATION o l o.o . . . . ..o. .o.000ssoo~o
EXPENDABLE SUPPLIES AND MATERIALS LIST
(Not Applicable)
A - 1
l
wl
TM
11-6625-2781-14-1
SECTION O
INTRODUCTION
0-1.
SCOPE .
This manual describes Plug-in Unit, Electronic Test Equipment PL-1388/U
a n d p r o v i d e s i n s t r u c t i o n s f o r o p e r a t i o n a n d m a i n t e n a n c e . Throughout this
manual, the PL-1388/U is referred to as Hewlett-Packard Model 8552B Spectrum
Analyzer IF Section.
0-2.
INDEXES OF PUBLICATIONS.
a . DA Pam 310-4. Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions , c h a n g e s , o r a d d i t i o n a l p u b l i c a t i o n s
pertaining to the equipment.
b . DA Pam 310-7. Refer to DA Pam 310-7 to determine whether there
are modification work orders (MWO’s) pertaining to the equipment.
0-3.
FORMS AND RECORDS.
a . Reports of Maintenance and Unsatisfactory Equipment. Maintenance
forms, records , and reports which are to be used by maintenance personnel
at all maintenance levels are listed in and prescribed by TM 38-750.
b . Report of Packaging and Handling Deficiencies. Fill out and
forward DD Form 6 (Packaging Improvement Report) as prescribed in AR
700-58/NAVSUPINST 4030.29/AFR 71-13/MCO P4030.29A and DLAR 4145.8.
c . Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and
forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed
in AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO P4610.19C and DLAR 4500.15.
0-4.
REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).
EIR’s will be prepared using DA Form 2407, Maintenance Request. Instructions for preparing EIR’s are provided in TM 38-750, The Army Maintenance Management System. EIR’s should be mailed directly to Commander,
US Army CERCOM, ATTN: DRSEL-MA-Q, Fort Monmouth, NJ 07703. A reply will
be furnished directly to you.
0-5.
ADMINISTRATIVE STORAGE.
“Administrative storage of equipment issued to and used by Army activities shall be in a c c o r d a n c e w i t h p a r a g r a p h 4 - 7 .
0-6.
DESTRUCTION OF ARMY ELECTRONICS MATERIEL.
Destruction of Army electronics materiel to prevent enemy use shall be
in accordance with TM 750-244-2.
0-1
TM 11-6625-2781-14-1
Model 8552B
General Information
Figure 1-1. Model 8552B Spectrum Analyzer IF Section
1-0
TM 11-6625-2781-14-1
General Information
Model 8552B
SECTION I
GENERAL
1-1. INTRODUCTION
1-2. This manual contains pertinent information
required to install, operate, test, adjust and service
the Hewlett-Packard Model 8552B Spectrum
Analyzer IF Section. This section covers instrument identification, description, accessories, specifications and other basic information. A more
complete discussion of overall operation of the
Spectrum Analyzer system is given in RF Section
manuals.
1-3. Figure 1-1 shows the Hewlett-Packard Model
8552B Spectrum Analyzer IF Section.
1-4. The various sections in this manual provide
information as follows:
SECTION II, INSTALLATION, provides information relating to inspection, power requirements, mounting, packing and shipping, etc.
SECTION III, OPERATION, provides information relative to operating the equipment.
SECTION IV, PERFORMANCE TESTS, provides information required to ascertain
whether the instrument is performing in
accordance with published specifications.
SECTION V, ADJUSTMENTS, provides information required to properly adjust and align
the instrument.
INFORMATION
may be tested. Table 1-1 also lists supplemental
characteristics. Supplemental characteristics are
not specifications but are typical characteristics
included as additional information for the user.
1-7. INSTRUMENTS COVERED BY MANUAL
1-8. This instrument has a two-part serial number.
The first four digits and the letter or the first three
digits and the hyphen comprise the serial number
prefix. The last five digits form the sequential
suffix that is unique to each instrument. The
contents of this manual apply directly to instruments having the serial prefix 1410A.
1-9. An instrument manufactured after the printing of this manual may have a serial prefix that is
different from that indicated above. If
so, refer to Section VII and make the
applicable manual changes.
1-10. In addition to change information, Section VII may contain information for correcting
errors in the manual. To keep this manual as
current and accurate as possible, Hewlett-Packard
recommends that you periodically request the
latest Manual Changes supplement.
SECTION VI, REPLACEABLE PARTS,
deleted. Refer to TM 11-6625-278124P-1 for replaceable parts.
SECTION VII, MANUAL CHANGES, provides backdating information.
SECTION VIII, SERVICE, provides information required to service the instrument.
1-5. Deleted.
1-11. For information concerning a serial number
prefix not covered in this manual, contact
your nearest Hewlett-Packard office.
1-12. DESCRIPTION
1-13. The HP Model 8552B Spectrum Analyzer IF
Section was designed to be used in conjunction
with an RF Section and a Display Section.
1-8. Instrument specifications are listed in Table
1-1. These specifications are the performance
standards, or limits against which the instrument
1-14. The complete analyzer is a highly sensitive
superheterodyne receiver with spectrum scanning
capabilities determined by the RF Section. Output video from the receiver circuits is applied to
the CRT in the display section; thus, a signal or
group of signals can be analyzed in the frequency
1-1
TM 11-6625-2781-14-1
General Information
domain. Input signals are plotted on the CRT as a
function of amplitude versus frequency. The amplitude (Y-axis) of the CRT is calibrated in absolute
units of power (dBm) or voltage (pV/mV); accordingly, absolute and relative measurements of both
amplitude and frequency can be made.
Model 8552B
1-19. Option H02. The calibrator output impedance is 75 ohms with an output of 8.66 mV (—30
dBm). The CAL OUTPUT connector is a BNC.
1-20. Option H04. The Log Amplitude reference is
calibrated in dB yV (0 dB~V is 1 ~V across 50 ohms).
1-15. The instrument controls are arranged for
easy operation. For wide spectrum analysis, the
operator can use the preset scan of the RF Section
used, or for a more detailed study, the spectrum
width can be progressively narrowed. The frequency scan can be stopped to allow use of the
instrument as a fixed frequency receiver. The RF
Section’s widest bandwidth is automatically
selected for preset scan operation; for variable scan
and fixed frequency operation, narrower bandwidths can be selected by the operator.
1-22. The Model 8552B must be mated with a
standard 8550 series RF Section and a 140 series
Display Section before it can function as a spectrum analysis system.
1-16. OPTIONS
1) 8552B-H01 . . . . . . . . . . . 8553B-H01
2) 8553B-H02 . . . . . . . . . . . 8553B-H02
3) 8552B-H04 . . 8553,8554,8555 (standard)
8556A-H11 (special)
1-17. The standard 8552B provides –30 ± 0.3
dBm calibrator output (7.07 mV into 50 ohms) at
30 ±0.003 MHz. A standard BNC connector is
used.
1-18. Option HOI. The calibrator output impedance is 75 ohms with an output of 8.66 mV (—30
dBm). The CAL OUTPUT Connector is equivalent
to the Western Electric WE-560A.
1-2
1-21. EQUIPMENT REQUIRED BUT NOT
SUPPLIED
1-23. RF Sections
1-24. The available 8552B Options must be mated
with the following RF Sections:
1-25. Display Sections
1-26, The 140 Display Sections are equipped with
a fixed-persistence, non-storage CRT. 141T Display
Sections are equipped with a variable persistence,
storage CRT. The 143 Display Sections have a large
screen (8 x 10 inch) fixed-persistence, non-storage
CRT.
TM
Model 8552B
11-6625-2781-14-1
General Information
Table 1-1. 8552B Specifications
SPECIFICATIONS
FREQUENCY
Resolution:
Bandwidth: IF bandwidths of 10 Hz to 300 kHz
provided in a 1, 3 sequence.
Bandwidth Accuracy: Individual IF bandwidths’ 3 dB
points calibrated to *20%(10 kHz bandwidth ±5%).
Bandwidth Selectivity: 60 dB/3 dB IF bandwidth
ratio <11:1 for IF bandwidths from 30 Hz
to 3 kHz and <20:1 for IF bandwidths from
10 kHz to 300 kHz, 60 dB points separated by
<100 Hz for 10 Hz bandwidth.
AMPLITUDE
Absolute Amplitude Calibration Range:
Amplitude Accuracy:
Log: From –130 to +10 dBm. 10 dB/div on a
70 dB display or 2 dB/div expand below LOG
reference.
Switching between
bandwidths
(at 20°C):
0.1-300 kHz
0.03-300 kHz
0.01-300 kHz
Amplitude Display
H04: From –23 to +117 dBV, 10 dB/div on a
70 dB display or 2 dB/div expand below LOG
reference.
Calibrator Output:
Amplitude: –30 dBm ± 0.3 dB; +77 dB#V (H04)
Standard/H04-8552B: 7.07 mV into 50 ohms
H01/H02-8552B: 8.66 mV into 75 ohms
Log
±0.5 dB
±1.0 dB
±1.5 dB
±0.25 dB/dB
but not more
than ±1.5 dB
over full 70
dB display
range
Linear
±5.8%
±12.0%
±19.0%
±2.8%
of full 8 div.
deflection
GENERAL
Scan Time: 16 internal scan rates from 0.1 ms/div
to 10 sec/div in a 1, 2, 5 sequence, or Manual
Scan.
Power Requirements: 115 or 230 volts ±10%, 50 to
60 Hz, normally less than 225 watts for complete
analyzer (varies with plug-in units used).
Scan Time Accuracy:
0.1 ms/div to 20 ms/div: ±10%
50 ms/div to 10 sec/div: ±20%
Weight: Model 8552B IF Section: Net 9 lb., 11 oz.,
(4,4 kg.)
Scan Mode:
Scan Characteristics
Scan Trigger: For Internal scan mode, select between:
Internal: Analyzer repetitively scanned by internally
generated ramp; synchronization selected by Scan
Trigger.
Auto: Scan free runs.
Single: Single scan actuated by front panel push.
button.
External: Scan synchronized with >2 volt (20V max)
trigger signal. Polarity selected by internal switch
(on assembly A6) of 8552B IF Section. Scan
triggers with negative impulse when switch in
NORMAL position.
External: Scan determined by 0 to +8 volt external
signal; scan input impedance >10 kfl.
Blanking: –1.5V external blanking signal required.
Manual: Scan controlled by position of Manual Scan
knob.
Line: Scan synchronized with power line frequency.
Video: Scan internally synchronized to envelope
of RF input signal (signal amplitude of 1.5
major divisions peak-to-peak required on display
section CRT).
Penlift Characteristics
Penlift output: 0 to +14 volts (0V pen down). Available in Internal and Single Scan modes and Auto, Line and Video
Scan Tigger.
1-3
TM
11-6625-2781-14-1
Model 8552B
General Information
1-27. EQUIPMENT AVAILABLE
1-29. RECOMMENDED TEST EQUIPMENT
1-28. The following equipment is recommended
for maintenance purposes:
a. HP 11592A Service Kit (shown in Figure
1-2).
b. Six-pin extender board (not included
in HP 11592A Service Kit) HP Part Number
5060-5914.
1-30. Table 1-2 lists the test equipment and accessories required to check, adjust and repair the
8552B Spectrum Analyzer IF Section. If substitute
equipment is used, it must meet the Minimum
Specifications listed in Table 1-2. Refer to
the Maintenance Allocation Chart in the
appendix for the required test equipments.
Table 1-2. Test Equipment and Accessories
Item
Minimum Specifications or Required Features
Suggested Model
Note*
Amplifier
Frequency Range: 3 to 30 MHz
Gain: 20 dB
Input and Output Impedance: 50 ohms
Flatness: ±1 dB
HP 8447A
P, A
Attenuator
Frequency Range: 0 – 30 MHz
Flatness: ±0.5 dB
Steps: 1 dB from 0 to 12 dB
HP 355C
A
Attenuator
Frequency Range: 0 – 30 MHz
Flatness: ±0.5 dB
Steps: 10 dB – 0 to 110 dB
HP 355D
A
Audio Oscillator
Frequency Range: 10 kHz
Output Amplitude: 2V rms
Frequency Accuracy: ±2%
Output Impedance: 600 ohms
HP 200CD
Digital Voltmeter
Voltage Accuracy: ±0.2%
Range Selection: Manual or Automatic
Voltage Range: 1 – 1000 Vdc full scale
Input Impedance: 10 megohms
Polarity: Automatic Indication
HP 3440A Digital
Voltmeter with
HP 3443A Plug-in
P, A, T
Crystal Detector
Frequency: 1 – 50 MHz
Sensitivity: >0.04 mV/pW
Frequency Response: ±0.2 dB
Polarity: Negative
HP 423A Crystal
Detector
A
Frequency Counter
Frequency Range: 100 kHz – 50 MHz
Accuracy: ±0.001%
Sensitivity: 30 mV rms
Readout Digits: 7
HP 5245L Frequency Counter
with
HP 5261A Plug-in
P, A
Oscilloscope
Frequency Range: DC to 50 MHz
Time Base: 1 ps/div to 10 ms/div
Time Base Accuracy: ±3%
Dual Channel, Alternate Operation
Ac or dc Coupling
External Sweep Mode
Voltage Accuracy: ±3%
Sensitivity: 0.005 V/div
HP 180A with
HP 1801A Vertical
Amplifier and
HP 1821A Horizontal Amplifier
HP 10004A 10:1
Probes
Divider
(2)
A, T
Note*
Performance
1-4
=
P;
Adjustment
=
A;
Troubleshooting
=
T
P, A
TM 11-6625-2781-14-1
Model 8552B
General Information
Table 1-2. Test Equipment and Accessories (cont’d)
Item
Minimum Specifications or Required Features
Suggested Model
Note*
Ohmmeter
Resistance Range: 1 ohm to 100 megohms
Accuracy: ±10 of Reading
HP 412A
T
Power Supply
Output Voltage: Variable, 0 – 30 Vdc
Output Current: 0 – 400 mA
Meter Resolution: <5 mV
HP 6217A Power
supply
A
Signal Generator
Frequency Range: 1 – 30 MHz
Output Amplitude: >0 dBm
Amplitude Accuracy: ±1%
Frequency Accuracy: ±1%
Output Impedance: 50 ohms
Modulation: External to 100%
HP 606B HF Signal
Generator
A
Signal Generator
Frequency Range: 30 to 50 MHz
Output Amplitude: >-20 dBm
Amplitude Accuracy: ±1%
Output Impedance: 50 ohms
Modulation: External Pulse or CW to 100%
HP 608F VHF Signal Generator
P, A, T
Oscillator Synchronizer
Frequency Range: 50 kHz – 310 MHz
Input Signal Level: 50 kHz – 20 MHz; 0.1 –
2V rms into 50 ohms, 10 – 310 MHz; 180 –
500 mV rms into 50 ohms.
Frequency Reference Stability: Short term, 5 x
10-8/minute
Frequency Control Output: Frequency control
voltage directly compatible with HP 606B and
HP 608F signal generators; output voltage
range, -2 to -32 Vdc (maximum)
HP 8708A Synchronizer
A
Sweep Oscillator
Frequency Range: 1 – 60 MHz
Output Flatness: ±0.25 dB over full band
Output Impedance: 50 ohms
Sweep Width: Up to 10 MHz
Output Amplitude: At least 0 dBm.
HP 8601A Generator/Sweeper
A
Pulse Generator
Rep Rate: 10 kHz to 100 kHz
Pulse Width: 0.5 to 5 msec
Pulse Amplitude: 2V
HP 222A
A
RF Voltmeter
Frequency Range: 3 MHz to 50 MHz
Amplitude Range: 0 to -40 dBm
Accuracy : ±5%
HP 3406A
T
Tunable RF Voltmeter
Bandwidth: 1 kHz
Frequency Range: 1 – 50 MHz
Sensitivity: 10 mV – 1V rms
Input Impedance: XI.1 megohms
HP 8405A Vector
Voltmeter
Extender Board
6-Pin
HP 5060-0050
A, T
50-ohm Tee
Type N female connectors on two ports, with
the third port able to accept HP 8405A probe
tips.
HP 11536A 50.ohm
Tee
P, A
P, A, T
Note*
Performance = P; Adjustment - A; Troubleshooting = T
1-5
TM
11-6625-2781-14-1
Model 8552B
General Information
Table 1-2. Test Equipment and Accessories (cont’d)
Item
Minimum Specifications or Required Features
Suggested Model
Note*
50-ohm Termination
Frequency Range: Dc -310 MHz
VSWR: 1.1
Power Rating: 0.5 Watt
Connector Type N Male
HP 908A Coaxial
Termination
P, A
Variable
Voltage
Transformer
Range: 102 – 127 Vac
Voltmeter Range: 103 – 127 Vac ±1 volt
General Radio
W5MT3A or
Superior Electric
UC1M
A
BNC Tee (2)
Two BNC Female Connectors; one Male BNC
Connector
UG-274B/U
HP 1250-0781
P, A, T
Adapter
BNC Male to Type N Female
UG-349A/U
HP 1250-0077
A
Adapter
BNC Male to Binding Post
HP 10110A
A
Adapter (3)
BNC Female to Type N Male
UG-201A/U
HP 1250-0780
P, A
Voltage Probe
Dust Banana Plug-to-Probe Tip
(Ground) Lead
HP 10025A
Straight-thru
Voltage Probe
A, T
Cable Assy (6)
Male BNC Connectors, 48 inches long
HP 10503A
P, A, T
Cable Assy
BNC Male to Dual Banana Plug, 45 inches long
HP 11001A
P, A, T
Cable Assy
Dual Banana Plug to Clip Leads, 45 inches long
HP 11002A
A, T
Cable Aasy
Dual Banana Plug to Dual Banana Plug, 44 inches
long
HP 11000A
A, T
Cable Assy
BNC Male to one end only; 44 inches. (Attach
Teat Clips to Shield and Center Conductor.)
HP 10501A
A, T
Tuning Tool, Slot
Nonmetallic, 6-inch shaft
Gowanda PC9668
A, T
Screwdrivers
Pozidrive No. 1 (small)
Stanley No. 5531
HP 8710-0899
A, T
Tuning Tool, Slot
Nonmetallic, 2.5-inch shaft
HP 8710-0095
A, T
Capacitor
8200 pF (approx.), See paragraph 5-38
HP 0140-0184
A, T
Adapter
Type N Female Connector to Type N Female
Connector
UG-29B/U
HP 1250-0777
A, T
Adapter
Type N Female to BNC Female Adapter
FXR 21850
A, T
Adapter
Type NBC Plug-to-Plug Adapter
UG-491B/U
HP 1250-0216
A, T
Tuning Tool
Fluted Tip, Siemans Halske B63399-B004-X000
HP 8710-0957
A
and Clip
Note
Performance = P: Adjustment = A; Troubleshooting = T
1-6
TM
11-6625-2781-14-1
General Information
Model 8552B
Table 1-2. Test Equipment and Test Accessories (cont’d)
Item
Service Kit
Minimum Specifications or Required Features
Suggested Model
Note
Contents:
140/141 Display Section to Spectrum Analyzer
Plug-in Extender Assembly (HP 11592-60015)
IF to RF Unit Interconnection Extender Cable
Assembly (HP 11592-60016)
Selectro Female to BNC Male Test Cable, Three
each, 36 inches long (HP 11592-60001)
Selectro Male to Selectro Female Test Cable,
Two each, 8 inches long (HP 11592-60003)
Selectro Female to Selectro Female Cable, One
each, 8 inches long (HP 11592-60002)
Extender Board Assembly, 15 pins, 30 conductors, for Plug-in Circuit Boards (HP
11592-60011)
Fastener Assembly, 8553 Circuit Board Extender,
Two each (HP 11592-20001 and HP
1390-0170)
Selectro Jack-to-Jack Adapter (HP 1250-0827)
Wrench, open end, 15/64 inch (HP 8710-0946)
BNC Jack-to-OSM Plug Adapter (HP 1250-1200)
OSM Plug-to-Plug Adapter (HP 1250-1158)
Cable Assembly, R and P Connector (HP
11592-60013)
HP 11592A Service
Kit
Adjustment,
Troubleshooting
Figure 1-2. HP 11592A Service Kit Required for Maintenance
1-7
TM 11-6625-2781-14-1
Installation
Model 8552B
Figure 2-1. Mode1 8552B Spectrum Analyzer IF Section with 8553B RF Section and 141T Display Section
2-0
TM
Model 8552B
SECTION
11-6625-2781-14-1
Installation
II
INSTALLATION
2-1. SHIPPING INFORMATION
2-2. Because of individual customer requirements,
shipping configurations are flexible. Initial inspection is based on the premise that the RF and IF
Sections are installed in the Display Section; thus
the instrument is physically and functionally complete for test. Since the RF and IF Sections are
received
separate] y, the plug-ins must be
mechanically fitted together, electrically connected, and inserted in a Display Section.
together, electrically connected, and then inserted
into the Display Section mainframe. To make these
connections refer to the RF Section Manual.
2-14. INSTALLATION CHECK
2-15. After installing the IF/RF Sections in the
Display Section, the installation procedures given
in Section II of the. RF Section manual should be
performed.
2-16. STORAGE AND SHIPMENT
2-3. INITIAL INSPECTION
2-17. Original Packaging
2-4. Mechanical Check
2-5. If shipping carton is damaged, ask that agent
of carrier be present when instrument is unpacked.
Inspect instrument for mechanical damage such as
scratches, dents, broken knobs, or other defects.
Also, check cushioning material for signs of severe
stress.
2-6. Performance Check
2-18. The same containers and materials used in
factory packaging can be obtained through any
Hewlett-Packard Sales and Service office.
2-19. If the instrument is being returned to
Hewlett-Packard for servicing attach a tag indicating the type of service required, return address,
model number and full serial number. Also mark
the container FRAGILE to assure careful handling.
2-7. As soon as possible after receipt, the instrument should be checked in accordance with the
Performance Tests in Section IV.
2-20. In any correspondence refer to the instrument by model number and full serial number.
2-8. CLAIMS FOR DAMAGE
2-21. Other Packaging Materials
2-9. If the Spectrum Analyzer
mechanically damaged or fails to
fied performance tests, refer to
0-3 and complete the proper
IF Section is
meet the speciparagraph
form. Reatain
shipping carton and padding material for inspection by the carrier.
2-22. The following general instructions should be
used for repackaging with commercially available
materials.
a. Wrap the instrument in heavy paper or
plastic. (If shipping to a Hewlett-Packard Service
office or center, attach a tag indicating the type of
service required, return address, model number and
full serial number.)
b. Use a strong shipping container. A doublewall carton made of 350 pound test material is
adequate.
2-10. POWER REQUIREMENTS
2-11. The IF Section receives its power from the
Display Section. Before connecting the analyzer to
a line power source, perform the installation procedures given in the Display Section manual.
2-12. CONNECTIONS
2-13. Since the RF and IF Sections are shipped
separately, the plug-ins must be mechanically fitted
c. Use enough shock-absorbing material
(three to four inch layer) around all sides of the
instrument to provide firm cushion and prevent
movement inside the container. Protect the control
panel with cardboard.
d. Seal the shipping container securely.
e. Mark the shipping container FRAGILE to
assure careful handling.
2-1/2-2
TM 11-6625-2781-14-1
Model 8552B
Operation
SECTION
III
OPERATION
3-1. INTRODUCTION
3-2. This section provides operating instructions
for the HP 8552B IF Section. The panel features
are described in Figure 3-1, Operator’s checks are
outlined in Figure 3-2, and Operating Instructions
are provided in the appropriate RF Section manual. Operator’s Maintenance provides instructions
for maintenance that can be done by the operator.
and AMPL CAL is set so that the signal peaks 3 dB
below the LOG REF graticule line. And since
-30 dBm = 7.07 mV (across 50 ohms), AMPL CAL
is fine-adjusted for 7.1 mV (27.07 mV) on the
CRT display.
Use the following procedure as a supplement to the
procedures specified in Section IV and the RF
Section manuals for AMPL CAL adjustment.
3-3. PANEL FEATURES
3-4. The panel features of the 8552B are shown
and explained in Figure 3-1, 8552B Spectrum
Analyzer IF Section Controls, Connectors and
Indicators.
NOTE
When the 8556A RF Section is used, the
correct adjustment procedure is located
in the RF Section manual.
1.
Make VERTICAL GAIN and POSITION
adjustments as specified in the manuals.
2.
Set LOG REF LEVEL to 80 dBgV (check that
LOG/LINEAR is set to 10 dB LOG, LOG REF
LEVEL Vernier is set to 0, and CAL OUTPUT
is connected to RF INPUT).
3.
Adjust AMPL CAL to set the 30 MHz calibrator signal 3 dB below the top (0 dB) graticule line on the CRT.
4.
Step INPUT ATTENUATION and LOG REF
LEVEL through their ranges. The signal
should increase or decrease 10 dB per step.
Set LOG/LINEAR to LINEAR and LINEAR
SENSITIVITY to 1 mV/div. Adjust AMPL
CAL to set the 30 MHz Calibrate; signal for
7.1 divisions on the CRT.
3-5. OPERATOR’S CHECKS
3-6. The Operator’s Checks are designed to familiarize the operator with the 8552B and give him an
understanding of the instrument capabilities.
3-7. The FRONT PANEL CHECK PROCEDURE
and Table 4-1, (in Section 4), provide the Operator’s Checks for the 8552B.
NOTE
When the 8552B-H04 is being used, the
adjustment of paragraph 3-14 should be
substituted for those in Section IV.
3-8. OPERATIONAL ADJUSTMENTS
5.
3-9. During checkout at the factory, the IF
Section is adjusted for proper operation. Upon
receipt of the instrument the operator must perform the front panel adjustments as shown in the
RF Section manual.
3-15. Refer to the RF Section manuals for specific operating instructions.
3-10. H01/H02 Instruments
3-16. OPERATING TIPS
3-11. For H01/H02 instruments it should be
recalled that at -30 dBm, the equivalent voltage is
8.66 mV (75 ohms). Perform the tests and adjustments as shown in the RF Section Manual.
3-17. When using the 10 Hz Bandwidth, use a
scan time of 1 second or slower, Special provision
is made in the 8552B IF Section to increase the
stability of the 50 MHz Converter during the slow
scans.
3-14. OPERATING INSTRUCTIONS
3-12. H04 Instruments
3-13. The -30 dBm CAL OUTPUT signal is used
to calibrate the analyzer. However, since 0 dBpV
(across 50 ohms) = -107 dBm, the -30 dBm signal
corresponds to +77 dBpV. To achieve correct log
calibration, LOG REF LEVEL is set to 80 d~V
3-18. When using MANUAL SCAN or EXTERNAL SCAN, the DISPLAY UNCAL lamp warns if
the combination of control settings being used
degrades the calibration. Do not sweep the analyzer any faster than it would be swept by an
internal scan with the control settings selected.
3-1
TM 11-6625-2781-14-1
Operation
Model 8552B
Figure 3-1. 8662B Spectrum Analyzer IF Section Controls and Connectors Indicators
3-2
TM
Model 8552B
11-6625-2781-14-1
Operation
Figure 3-1. 8552B Spectrum Analyzer IF Section Controls, Connectors and Indicators (cont ‘d)
3-3
TM 11-6625-2781-14-1
Operation
3-19. OPERATOR’S MAINTENANCE
3-20. Operator’s maintenance involves changing
the -12.6 and -10 Vdc fuses, which are located on
the rear panel of the 8552B.
3-21. Both fuses (F1 and F2), may be ordered
under HP part number 2110-0001.
3-4
Model 8552B
3-22. If the fuse is replaced and it immediately
burns out again, a competent technician should
be called to troubleshoot the instrument.
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
SECTION
IV
PERFORMANCE
4-1. INTRODUCTION
4-2. Perform tests in procedural order with the
test equipment called for, or with its equivalent.
Specifications of test equipment and accessories
required to performance-test the analyzer are given
in Table 1-2.
4-3. Front panel checks for routine inspection are
given in Table 4-1. Procedures for verifying that
the instrument meets specifications are given in
Paragraphs 4-23 through 4-28, and a test card in
Table 4-5 contains data spaces for recording test
results.
4-4. During any performance test, all shields and
attaching hardware must be in place and the RF
and IF Section plug-ins must be installed in the
display section. The analyzer must be allowed to
warm up at least one-half hour before being tested
or adjusted.
4-5. FRONT PANEL CHECKS
4-6. Before proceeding to the front panel checks,
the instrument must be adjusted and all the controls set as specified in the preset adjustment instructions in paragraph 4-13. After the instrument
is set up, proceed with the checks. The instrument
should perform as called out in the procedure
(paragraphs 4-12 through 4-21) before going on to
the performance tests.
4-7. PERFORMANCE TESTS
4-8. The performance tests given in this manual
are suitable for incoming inspection, troubleshooting or preventive maintenance. The tests are
designed to verify published instrument specifications. Perform the tests in the order given, and
record data on the test card (Table 4-5) at the end
of this section. These tests assume the use of an
8553B RF Section and a 141T Display Section
unless otherwise noted. If another RF Section is
used the procedure must be adjusted accordingly: the frequencies used may change and some
bandwidths will not be available for checking. If
another Display Section is used, the tests that
require variable persistence can be performed using
an X-Y Recorder.
TESTS
4-9. The tests are arranged in the following order:
Para.
4-23
4-24
4-25
4-26
4-27
4-28
Test Description
Calibrator Output
Bandwidth Accuracy
Bandwidth Selectivity
Switching between Bandwidths Accuracy
Amplitude Display Accuracy
Scan Time Accuracy
4-10. Each test is arranged so that the specification is written out as it appears in the Table of
Specifications. Next, a description of the test and
any special instructions or problem areas is included. Each test that requires test equipment has
a test setup drawing and a list of required equipment. Each procedure gives control settings required for that particular test. Data spaces are
included in each test procedure, and the spaces are
repeated in the Performance Test Card at the end
of this section.
4-11. Required specifications for test equipment
are detailed in Table 1-2 in Section 1. If substitute
test equipment is to be used, it must meet the
specifications listed in order to check the analyzer.
4-12. FRONT PANEL CHECK PROCEDURE
4-13. Preset Adjustments
4-14. Turn analyzer ON and preset the INTENSITY & FOCUS to approximately 1 o’clock. While
the analyzer is warming up make the following
control settings:
RANGE MHz . . . . . . . . . . . . . . . . . . . . . 0–110
FREQUENCY . . . . . . . . . . . . . . . . . . . . 40 MHz
FINE TUNE . . . . . . . . . . . . . . . . . . . . . . Centered
BANDWIDTH . . . . . . . . . . . . . . . . . . . . 300 kHz
SCAN WIDTH . . . . . . . . . . . . . . . . . 0-100 MHz
SCAN WIDTH PER DIVISION . . . . . . . 10 MHz
INPUT ATTENUATION . . . . . . . . . . . . . . 10 dB
TUNING STABILIZER . . . . . . . . . . . . . . . . . On
BASELINE CLIPPER . . . . . . . . . . . . . . . . . . .ccw
SCAN TIME PER DIVISION 5 MILLISECONDS
LOG REF LEVEL . . . . . . . . . . . . . . . . . -l0 dBm
LOG REF LEVEL Vernier . . . . . . . . . . . . . . . ..0
LOG LINEAR . . . . . . . . . . . . . . . . . . 10 dB LOG
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . 10 kHz
SCAN MODE . . . . . . . . . . . . . . . . . . . . . . . . INT
SCAN TRIGGER . . . . . . . . . . . . . . . . . . . AUTO
4-15. Connect CAL OUTPUT to RF INPUT using
a BNC-to-BNC cable. The display on your analyzer
should be similar to Figure 4-1.
4-1
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
NOTE
The other signals on the display are the
"zero frequenty" First LO feed through
and the 60 MHz and 90 MHz harmonics
of the calibrator signal.
d. Set the SCAN WIDTH PER DIVISION
control to .05 MHz and the BANDWIDTH to 10
kHz.
e. Switch the red SCAN WIDTH control to
the PER DIVISION position. The BANDWIDTH,
SCAN WIDTH PER DIVISION, and Center Frequency are now those selected in steps c and d.
(The marker makes it easy to select any signal in
0–100 MHz scan and expand the display about
that signal.)
Figure 4-1. 30 MHz Calibrator Signal & Harmonics
4-16. Display Section Adjustments
a.
Set LOG REF LEVEL max ccw.
b. Set SCAN TIME PER DIVISION to 10
SECONDS and adjust FOCUS and ASTIGMATISM
for the smallest round spot possible.
c. Reset SCAN TIME PER DIVISION to 5
MILLISECONDS. Adjust TRACE ALIGN so that
horizontal base line of the CRT trace is exactly
parallel to the horizontal graticule lines.
4-17. IF Section Display Adjustments
a. Adjust VERTICAL POSITION so that the
horizontal base line of the CRT trace is exactly on
the bottom horizontal graticule line of the CRT,
Set LOG REF LEVEL to 0 dBm.
b. Adjust HORIZONTAL POSITION so
display is centered on CRT. Then adjust HORIZONTAL GAIN until the displayed scan width is
exactly 10 divisions. Some interaction between
HORIZONTAL POSITION and GAIN may occur,
requiring slight readjustment of the controls.
f. Adjust FREQUENCY tuning to center 30
MHz calibrator signal, if necessary. Then reduce
SCAN WIDTH PER DIVISION to 10 kHz. Use
FINE TUNE to center the signal on the display,
(The analyzer’s First LO is automatically phaselocked to a crystal oscillator reference for the blue
color-coded SCAN WIDTH positions since the
TUNING STABILIZER was set on. Therefore, the
FREQUENCY control — which tunes the First LO
— should not be used to tune the analyzer; frequency would tune in 100 kHz steps, )
g. Adjust the LOG REF LEVEL controls so
the maximum signal amplitude is exactly on the
-70 dB, graticule line. Rotate LOG REF LEVEL
control seven steps in the clockwise direction. The
amplitude of the signal should increase in increments of one division per 10-dB step (see Figure
4-2),
h. Adjust VERTICAL GAIN to place maximum signal amplitude exactly on LOG REF (top)
graticule line (Figure 4-2). Repeat steps g and h to
obtain optimum adjustment of VERTICAL GAIN
(increments as close to one division per 10 dB step
as possible),
The display on your CRT should now match
Figure 4-1 almost exactly. (The amplitudes of the
individual signals may be slightly different,)
c. Note the inverted marker below the bottom graticule line. This marker indicates the display center frequency of the ZERO and SCAN
WIDTH PER DIVISION tuning modes. Adjust the
FREQUENCY control to place this marker exactly
under the signal three divisions from the left,
This signal is the 30 MHz calibrator signal. Tune
the marker carefully to null the signal.
4-2
Figure 4-2. Vertical Gain Adjustment
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
4-18. Ampl. Cal Adjustment Resection
a. Set the LOG REF LEVEL controls to -30
dBm (-30 +0).
Since the –30 dBm calibrator output is ~7.1
mV (across 50 ohms), the CRT deflection should
be =7.1 divisions.
NOTE
For standard options H01/H02 the CRT
deflection should be =8.7 mV across
75 ohms.
b. Adjust AMPL CAL so that the signal
amplitude (-30 dBm) is exactly on the LOG REF
(top) graticule line of the CRT.
b. Adjust AMPL CAL on RF Section for a
=7.1 div CRT deflection, if necessary. (LINEAR
display is more expanded than the compressed
LOG display, so adjustment of the AMPL CAL
control can be made with more resolution in
LINEAR without noticeable effect on the LOG
calibration. )
The analyzer is now calibrated in the LOG display
mode.
4-19. Ampl Cal Check for Linear Sensitivity
Accuracy
4-20. In the LINEAR display mode the vertical
display is calibrated in absolute voltage. For
LINEAR measurements the LIN scale factors on
the left side of the CRT and the blue color-coded
scales of the LINEAR SENSITIVITY controls are
used. The signal voltage is the product (note
lighted “x” lamp) of the CRT deflection and
LINEAR SENSITIVITY control settings. It is
usually most convenient to normalize the LINEAR
SENSITIVITY vernier by setting it to “1” (blue
scale ).
a. Set the LOG-LINEAR switch to LINEAR,
Set LINEAR SENSITIVITY to 1 mV/div (1 mV x 1).
The analyzer is now calibrated for both the LOG
and LIN display modes.
4-21. Set controls as follows:
SCAN WIDTH, , . . . . . . . . . . . . . . . 0-100 MHZ
SCAN WIDTH PER DIVISION . . . . 10 MHz
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . 10 kHz
LOG -LINEAR . . . . . . . . . . . . . . . . . .10 dB LOG
LOG REF LEVEL . . . . . . . . . . . . . . . . -10 dBm
TUNING STABILIZER . . . . . . . . . . . . . . . . On
Perform tests in Table 4-1, Front Panel Checks.
NOTE
Make NO Front Panel adjustments with
LOG- LINEAR set to 2 dB LOG.
4-3
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
Table 4-1. Front Panel Checks
Function
Procedure
Result
Base Line Clipper
1. Turn BASE LINE CLIPPER cw.
2. Return clipper to ccw.
1. At least the bottom 2 divisions
should blank.
Scan
3. Tune SCAN TIME across its range.
4. Return to 5 ms/div.
3. Scan should occur in all positions.
Scan Width
5. Turn SCAN WIDTH to PER
DIVISION.
6. Center CAL OUTPUT signal on
display.
5.30 MHz signal and harmonics
visible. DISPLAY UNCAL light
comes on.
7. Reduce SCAN WIDTH PER DIVISION to 20 kHz; use FINE
TUNE to center display.
7. Signal remains on-screen, centered.
8. With TUNING STABILIZER on,
slowly turn the FREQUENCY
control.
8. Signal jumps to left or right hand
edges of CRT (± 100 kHz). This
corresponds to the 100 kHz
reference oscillator in the automatic phase control circuit.
9. Turn TUNING STABILIZER to
OFF; use FREQUENCY to center
display.
9. Signal should tune continuously.
10. Turn TUNING STABILIZER on,
use FINE TUNE to center display,
10. Signal should not jump 100 kHz.
11. Reduce BANDWIDTH, SCAN TIME
PER DIVISION, and SCAN WIDTH
PER DIVISION, using FINE TUNE
to center display.
11. Display should be stable, and
viewable as long as DISPLAY
UNCAL is unlit.
Phase Lock
Bandwidth
and Display
Uncal Light
12. Return BANDWIDTH to 10 kHz,
SCAN WIDTH PER DIVISION to
20 kHz and SCAN TIME PER DIVISION to 5 MILLISECONDS.
4-4
Calibration
13. Lit index light on LOG REF LEVEL.
LINEAR SENSITIVITY corresponds
to top line of graticule; with input
attenuation at 20 dB and LOG REF
LEVEL at -10 dBm, signal level is
-30 dBm.
13. Calibrator signal is -30 dBm level
(2 divisions down from top of
graticule).
Gain Vernier
14. Turn LOG REF LEVEL LINEAR
SENSITIVITY vernier CW.
14. Signal level increases by amount
marked on vernier dial.
Attenuators
15. Turn INPUT ATTENUATION and
LOG REF LEVEL-LINEAR SENSITIVITY in 10 dB steps.
15. Signal increases or decreases one
vertical division per 10 dB step.
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
PERFORMANCE TESTS
4-23. Calibrator Output
SPECIFICATION:
Amplitude: .30 dBm ±0.3 dB
Frequency: 30 MHz ± 3 kHz
DESCRIPTION: The Calibrator’s amplitude accuracy is checked by comparing the 30 MHz fundamental
signal with a source of known accuracy. The frequency is checked by amplifying the signal and measuring it
with a frequency counter.
Figure 4-3. Calibrator Amplitude Test Setup
EQUIPMENT:
SIGNAL
GENERATOR
.
. . . . . . . . . . . . . . . . . . . . HP608F
CABLE ASSEMBLY (2). . . . . . . . . . . . . . . . . . . HP10503A
CABLE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . HP11001A
50-OHM TEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP11536A
UG-201A/U
ADAPTER (2)
HP 908A
50-OHM TERMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP 8447A
FREQUENCY COUNTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5245 L
HP 8405A
VECTOR VOLTMETER . . . . . . . . . . . . . . . . . . . . . . .
DIGITAL VOLTMETER . . . . . . . . . . . . . . . . . . . . . . HP 3440A/3443A
4-5
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
PERFORMANCE TESTS
4-23. Calibrator Output (cont’d)
1. Connect the equipment as shown in Figure 4-3 and make the following settings:
ANALYZER:
. . . . . .
RANGE MHz
. . . . . .
FREQUENCY
. . . . . .
BANDWIDTH
. . . . . .
SCAN WIDTH
SCAN WIDTH PER DIVISION
INPUT ATTENUATION . .
SCAN TIME PER DIVISION
.
LOG-LINEAR
LINEAR Sensitivity
: .
VIDEO FILTER . . . .
.
SCAN MODE
SCAN TRIGGER . . . . . . .
8405A:
FREQ. RANGE -MC . .
CHANNEL . . . .
.
AMPLITUDE RANGE – dB
.
.
.
.
.
.
.
.
.
.
.
.
3440A:
RANGE . . . . . .
. .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
608F:
FREQUENCY RANGE
MEGACYCLES .
.
MODULATION . .
ATTENUATION . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
0–110
. . . .
. . . . 30 MHz
300 kHz
.
. PER DIVISION
1 MHz
. . . .
10 dB
.
5 M i l l i Se C O n d S
LINEAR
.
mV/DIV
.
.
. OFF
INT
AUTO
20–40
. .
. . -30
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. .
. .
30
Cw
-30 dBm
AUTO
2.
Use signal generator ATTENUATOR VERNIER to set generator amplitude to exactly -30 dBm (7.22
mV for Options H01/H02) as read on vector voltmeter.
3.
Disconnect the signal generator from the vector voltmeter; connect signal generator to analyzer RF
INPUT, Center the signal on the CRT display with analyzer FREQUENCY control.
4.
Set SCAN WIDTH to ZERO and peak the trace with analyzer FREQUENCY control. Use analyzer
LINEAR SENSITIVITY vernier to set signal level (as read on digital voltmeter) to 700 ± 0.4 mV. Do
not change LINEAR SENSITIVITY vernier during remainder of check.
5.
Disconnect the signal generator from RF INPUT and connect CAL OUTPUT to RF INPUT. Peak trace
with FREQUENCY control. Signal level (as read on digital voltmeter) should be between 670 and 731
mV (±0.3 dB):
670
731 mV
4-6
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
PERFORMANCE TESTS
4-23. Calibrator Output (cont’d)
Figure 4-4. Calibrator Frequency Check Test Setup
6. Connect the equipment as shown in Figure 4-4 and make the following settings:
HP 5245L:
SAMPLE RATE
TIME BASE. . . . . . . . . . . . . . . . . . . . . .
FUNCTION. . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
9 o’clock
. . . . . . . . . . . . .
FREQUENCY
. . . . . . . .
7. Read CAL OUTPUT on the frequency counter, 30 MHz ± 3 kHz.
30.003 MHz
29.997
4-24. Bandwidth Accuracy
SPECIFICATION: Individual IF bandwidtb 3 dB points calibrated to ±20% (10 kHz bandwidth ± 5%).
DESCRIPTION: While observing a signal on the CRT display, all bandwidths except 10 kHz are verified by
measuring the half-power points of the signal. The 10 kHz bandwidth is measured by using a frequency
counter to monitor the input signal generator frequency as it is tuned between the IF filter half-power
points.
EQUIPMENT:
SIGNAL GENERATOR
FREQUENCY COUNTER . . . . . . . . . . . . . .
CABLE
ASSEMBLY
(2)
.
. . . . . . .
ADAPTER
.
.
.
.
.
.
.
.
.
1. Make the following analyzer control settings:
RANGE–MHz . . . . . . . . .
.
FREQUENCY
.
. . . . .
. . . .
. . . .
BANDWIDTH . . . . . .
. . . .
SCAN WIDTH
SCAN WIDTH PER DIVISION . .
. .
INPUT ATTENUATION
. . . . .
. . . .
SCAN TIME PER DIVISION
TUNING STABILIZER . . . . . . . .
BASE LINE CLIPPER . . . . . . . .
LOG-LINEAR . . . . . . . . .
.
.
. . .
. .
.
. .
. . . . .
. .
.
.
. .
.
. . . . . . . . .
.
. . .
.
. . .
. . .
. . .
. .
.
. . .
. . .
. . .
.
.
.
. .
. .
. .
.
.
.
.
.
. . . . .
.
. . .
.
. . .
. .
.
. . .
.
. .
. .
.
.
.
.
. .
.
.
.
. .
.
. .
. .
. . .
. .
. .
.
.
. .
.
.
.
.
.
.
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.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
6
. . HP 608F
HP 5245L
HP 10503A
UG-201A/U
. . .
. . . 30 MHz
. . . 300 kHz
PER DIVISION
. .
.05 MHz
. . .
. 10 dB
MILLISECONDS
. . . . . On
.
.
. Max ccw
. . . . . LINEAR
4-7
TM 11-6625-2781-14-1
performance Tests
Model 8552B
PERFORMANCE TESTS
4-24. Bandwidth Accuracy (cont’d)
Analyzer control settings (cent ‘d)
LINEAR SENSITIVITY . . .
VIDEO FILTER . . . . . .
SCAN MODE . . . . . . . . . . . . .
SCAN TRIGGER . . . . . . . . . . . . .
. .
. . .
. . . .
. . . .
.
. .
. . .
. . . . . .
. . . . . .
. . .
. . .
. . . . .
. . . . .
. . .
. . . .
. . . . . .
. . . . . .
.
. .
. . .
. . . . .
. . . . .
. . . . . . .2mV/Div
10 kHz
. . . . . . .
. . . . . . . . . . . . . . . INT
. . . . . . . . . . . . . . . . . . . . . . AUTO
2. Connect CAL OUTPUT to RF INPUT.
3. Use LINEAR SENSITIVITY vernier control to adjust for 5.7 divisions signal amplitude.
4. Measure the bandwidth at the half-power points at the 4.0 division line. Bandwidth should be 300 ± 60
kHz (4.8 to 7.2 divisions).
4.8
7.2 div
NOTE
The bandwidth checks (Table 4-2), assume the use of the 8553B RF Section and 141 T
Display Section. With other RF Sections, some bandwidths aren’t used; on bandwidths
that are used it may be impossible to achieve the resolution needed to take the reading.
5. Repeat steps 3 and 4 to measure the bandwidths listed in Table 4-2, and set the controls as indicated in
the table. (When checking .03 and .01 kHz bandwidths: set SCAN MODE to SINGLE, PERSISTENCE
to MAX and push single scan button. When finished, set SCAN MODE to INT, PERSISTENCE to
MIN.)
Table 4-2. Bandwidth Checks
BANDWIDTH
100 kHz
30 kHz
3 kHz
1 kHz
0.3 kHz
0.1 kHz
.03 kHz
.01 kHz
SCAN WIDTH
PER DIVISION
20 kHz
5 kHz
0.5 kHz
0.2 kHz
.05 kHz
.02 kHz
.02 kHz
.02 kHz
SCAN TIME
PER DIVISION
5 MILLISECONDS
5 MILLISECONDS
10 MILLISECONDS
10 MILLISECONDS
10 MILLISECONDS
0.2 SECONDS
1 SECONDS
1 SECONDS
3 dB Bandwidth
4.0
4.8
4.8
4.0
4.8
4.0
1.2
0.4
Figure 4-5. 10 kHz Bandwidth Accuracy Test Setup
4-8
6.0 div
7.2 div
7.2 div
6.0 div
7.2 div
6.0 div
1.8 div
0.6 div
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
PERFORMANCE TESTS
4-24. Bandwidth Accuracy (cont’d)
6. To check the 10 kHz bandwidth, connect the test setup shown in Figure 4-5 and make the following
control settings.
ANALYZER :
BANDWIDTH
SCAN WIDTH PER DIVISION” : : : : : : : : : : : : : : : : : : :
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . .
TUNING STABILIZER . . . . . . . . . . . . . . . . . . . .
608F:
MEGACYCLES . . . . . . . . . . . . . . . . . . . . . .
ATTENUATION . . . . . . . . . . . . . . . . . . . . . .
MODULATION . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY RANGE . . . . . . . . . . . . . . . . . . . . .
RF OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . .
: : : :
10 kHz
.
5 MILLISECONDS
. . . . . . . .On
.
.
.
.
.
.
.
.
.
.
.
. ...30
..-30dBm
. . ..CW
. . . . .
. . . . .
. ... +7(on meter)
5245L:
SENSITIVITY (VOLTS RMS) . . . . . . . . . . . . . . . . . . . . . .
FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY
7.
Fine adjust the signal generator frequency to center the 30 MHz signal on the CRT display.
8.
Using FINE TUNE to keep the display centered, reduce SCAN WIDTH PER DIVISION to 20 kHz. Set
SCAN WIDTH to ZERO scan. Set VIDEO FILTER to 10 Hz.
9.
Peak the signal using FINE TUNE and adjust LINEAR SENSITIVITY Vernier control for a 7.1 division
display.
NOTE
Steps 10 and 11 check upper and lower 3 dB points.
10. Decrease HP 608F frequency until the base line drops to the 5.0 division line. Record the signal
generator frequency as read from the HP 5245L Frequency Counter.
MHz
11. Increase HP 608F frequent until the base line peaks and then drops to the 5.0 division line. Record
the signal generator frequency.
MHz
12. The difference in the readings of steps 10 and 11 equals the half-power bandwidth. The bandwidth
should be 10 ±0.5 kHz.
9.5
10.5 kHz
4-25. Bandwidth Selectivity
SPECIFICATION:
60 dB/3 dB IF bandwidth ratio <20:1 for IF bandwidths from 10 kHz to 300 kHz.
60 dB/3 dB IF bandwidth ratio <11:1 for IF bandwidths from 10 Hz to 3 kHz.
60 dB points separated by <100 Hz for 10 Hz bandwidth.
DESCRIPTION: Bandwidth selectivity is verified by observing the CAL OUTPUT signal in the LOG mode
on the CRT and measuring the bandwidth at the -60 dB points using the analyzer’s calibrated scan widths.
The ratio of this bandwidth to the 3 dB bandwidths defines the analyzer selectivity.
4-9
TM 11-6625-2781-14-1
Model 8552B
Perforrnance Tests
PERFORMANCE TESTS
4-25. Bandwidth Selectivity (cont’d)
1. Connect CAL OUTPUT to RF INPUT and make the following control settings:
ANALYZER:
0-110
RANGE - MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..30 MHz
300 kHz
BANDWIDTH
0 dB
I N P U T
A t t e n u a t i o n ’ : : : : :
: : : : : : : : : : : : : : : :
: : : : : .
PER DIVISION
SCAN WIDTH
1 MHz
SCAN WIDTH PER DIVISION.::: :::::::::::::::: :: . . .
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . 50 MILLISECONDS
10 dB LOG
LOG LINEAR
L O G
R E F
L E V E L : : : : : : : : :
: : : : : : : : : : : : : : : : :
: : . 2 0 d B m
BASE LINE CLIPPER . . .. o.. . . . . . . . . . . . . . . . . . . .. Max ccw
TUNING STABILIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . ..On
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . ..100HZ
INT
SCAN MODE
S C A N
T R I G G E R ” : : : : : : : :
: : : : : : : : : : : : : : : :
: : : :
: ’
A U T O
2. Tune FREQUENCY to center the CAL OUTPUT signal on the CRT display; adjust LOG REF LEVEL
Vernier to peak the signal on the top graticule line.
3. Compute the bandwidth at the -60 dB graticule line (SCAN WIDTH PER DIVISION setting times the
number of divisions separating the signal’s dopes). Compute the 60 dB/3 dB IF bandwidth ratio using
the 3 dB bandwidth found in Paragraph 4-24.
60 dB bandwidth
3 dB bandwidth
20:1
NOTE
If the DISPLAY UNCAL lamp is illuminated in any of the steps shown in table 4-3, it
may be disregarded.
4. To check the remaining BANDWIDTH settings, refer to Table 4-3 for control settings and test limits.
Compute the 60 dB/3 dB IF bandwidth ratios using the 3 dB bandwidths found in Table 4-2. (When
checking 0,03 and 0,01 bandwidths, set SCAN MODE to INT, PERSISTENCE to MIN.)
Table 4-3. Bandwidth Selectivity Checks
BANDWITH
SCAN WIDTH
PER DIVISION
SCAN TIME
PER DIVISION
100 kHz
30 kHz
10 kHz
3 kHz
1 kHz
0.3 kHz
0.1 kHz
.03 kHz
.01 kHz*
0.5 MHz
0.1 MHz
0.05 MHz
kHz
5
kHz
2
0.6 kHz
0.2 kHz
0.06 kHz
0.02 kHz
50 MILLISECONDS
50 MILLISECONDS
60 MILLISECONDS
SO MILLISECONDS
0.1 SECONDS
0,2 SECONDS
0.2 SECONDS
0.2 SECONDS
0.5 SECONDS
RATIO FREQUENCY
60 dB BANDWIDTH
DIVISIONS
60 dB/3 dB BANDWIDTHS
*10 Hz 60 dB bandwidth must be less than the 11:1 ratio and the 60 dB points separated by less than 100 Hz.
4-10
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
PERFORMANCE TESTS
4-26. Switching Between Bandwidths Accuracy
SPECIFICATION:At
0.1-300 kHz
0.03-300 kHz
0.01-300 kHz
20°C, L o g Linear
±0.5dB ±5.8%
±1 .0 dB
±12.0%
±1.5 dB
±19.0%
DESCRIPTION: Relative bandwidth amplitude accuracy is verified by observing the amplitude of the CAL
OUTPUT signal while switching IF bandwidths. The display is observed in the LINEAR mode for best
amplitude resolution.
1.
Connect CAL OUTPUT to RF INPUT and set analyzer controls as follows:
RANGE – MHz . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY
F I N E T U N E
. :
~ : : : : : : : :
: : : : : : : : : : : : : : : : :
: :
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . .
SCAN WIDTH
S C A N W I D T H P E R D I V I S I O N ” : : : : : : : : : : : : : : : : : :
INPUT ATTENUATION
SCAN TIME PER DIVISION “ : : : : : : : : : : : : : : : : : : :
BASE LINE CLIPPER . . . . . . . . . . . . . . . . . . . . . .
LOG LINEAR
L I N E A R
S e n s i t i v i t y ” : : : : : :
: : : : : : : : : : : : : : : : :
TUNING STABILIZER . . . . . . . . . . . . . . . . . . . . . . .
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . .
SCAN MODE
S C A N
T R I G G E R ’ : : : : : : : : : :
: : : : : : : : : : : : : : :
. . . .
0-110
30 Mhz
: C e n t e r e d
. . . ,..300kHz
PER DIVISION
: : : 0 . 5 M H z
:5MILLISECONDS
. . . . .Maxccw
LINEAR
: : 2 m V / D I V
ON
. . . . .
. . . ,,, 10kHz
INT
: : :
A U T O
2.
Adjust FREQUENCY to center CAL OUTPUT signal on CRT.
3.
Set LINEAR SENSITIVITY controls for a 7.0 division display; set SCAN TIME PER DIVISION to 0.2
SECONDS, SCAN WIDTH PER DIVISION to ,05 MHz.
4.
Progressively switch BANDWIDTH from 300 kHz through 1 kHz. Note the signal amplitude at each
BANDWIDTH setting.
NOTE
Steps 5 and 6 require use of a 141 type variable persistence Display Section.
5.
Set SCAN WIDTH to .05 kHz; set SCAN TIME PER DIVISION to 1 SECOND.
6.
progressively switch BANDWIDTH from 0.3 kHz to 0.01 kHz. Again note the signal amplitude at
each BANDWIDTH setting. The maximum deviation between any two bandwidths (100 Hz to 300
kHz) should be less than 0.8 division. The maximum deviation between any two bandwidths (30 Hz
to 300 kHz) should be less than 1.6 division. The maximum deviation between any two bandwidths
(10 Hz to 300 kHz) should be less than 2,6 division.
100 Hz to 300 kHz:
0.8 div
30 Hz to 300 kHz:
1.6 div
10 Hz to 300 kHz:
2.6 div
4-11
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
PERFORMANCE TESTS
4-27. Amplitude Display Accuracy
SPECIFICATION:
± 0.25 dB/dB but not more than ±1.5 dB over the full 70 dB display range.
DESCRIPTION: A full eight division signal is displayed on the CRT in the LOG mode. The LOG REF
LEVEL is then changed 70 dB in 10 dB steps. The error of the CRT display is measured at each step. It is
assumed that the IF Section Display Adjustments in Paragraph 4-17 have been performed.
1. Connect CAL OUTPUT to RF INPUT.
2. Set Analyzer controls as follows:
RANGE – MHz.. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0-110
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..30 MHz
FINE TUNE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Centered
BANDWIDTH . . . . . . . . . . . . . . . . . ..... . . . ..100kHz
PER DIVISION
SCAN WIDTH
SCAN WIDTH PER DIVISION” : : : : : : : : : : : : : : : : : : : : : . . . 0.5 MHz
INPUT ATTENUATION
SCAN TIME PER DIVISION “ : : : : : : : : : : : : : : : : : : : : 5MILLISECONDS
BASE LINE CLIPPER . . . . . . . . . . . . . . . . . . . . . . . . . .. Maxccw
LOG-LINEAR
10 dB LOG
L O G
R E F
L E V E L ; : : : : : : :
: : : : : : : : : : : : : : : :
: : : :
. - 2 0 d B m
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
INT
SCAN MODE
S C A N
T R I G G E R . : : : : : : : : :
: : : : : : : : : : : : : : : : :
: : : ”
A U T O
3. Adjust FREQUENCY to center the 30 MHz CAL signal on the CRT display and adjust LOG REF
LEVEL Vernier for a full eight division vertical display.
4. Change the LOG REF LEVEL to reduce the displayed signal amplitude 10 dB. Signal amplitude should
be seven divisions ±0.15 division.
6.85
7.15 div
5. Change the LOG REF LEVEL to reduce the signal amplitude in 10 dB steps to verify the entire 70 dB
display range.
4-12
a.
-20 dB
5.85
6.15 div d.
-50 dB
2.85
3.15 div
b.
-30 dB
4.85
5.15
e.
-60 dB
1.85
2.15 div
c.
-40 dB
3.85
4.15 div f.
-70 dB
0.85
1.15 div
div
TM 11-6625-2781-14-1
Model 8552B
Performance Tests
PERFORMANCE TESTS
4-28. Scan Time Accuracy
SPECIFICATION:
0.1 ms/div up to 20 ms/div ±10%.
50 ms/div to 10s/div ±20%.
DESCRIPTION: A sine wave modulated RF signal is connected to the RF INPUT. The demodulated signal
is displayed on the analyzer CRT and its peaks aligned with the CRT graticule by adjusting the modulation
frequency. Scan time is verified by measuring the period average of the modulation signal using a frequency
counter.
Figure 4-6. Scan Time Accuracy Test Setup
EQUIPMENT:
FREQUENCY COUNTER
AUDIO OSCILLATOR .
SIGNAL GENERATOR
CABLE ASSEMBLY (3)
CABLE ASSEMBLY . .
BNC Tee . . . . . .
ADAPTER . . . . .
.
.
,
.
.
.
.
.
. .
. . #
.
.
.
.
.
. . .
.
.
. . . .
. .
.
.
.
.
.
.
. . .
. .
.
.
.
.
.
.
.
.
.
.
.
HP 5245L
HP 200CD
, HP 608F
HP 10503A
HP 11001A
UG-274B/U
UG-201A/U
1. Connect the test setup in Figure 4-6 and make the following control settings:
ANALYZER:
RANGE - MHz . . . ,
.
FREQUENCY . . . , .
.
FINE-TUNE . . , . ,
.
BANDWIDTH . . , ,
.
SCAN WIDTH . . . .
INPUT ATTENUATION
.
.
SCAN TIME PER DIVISION
.
BASE LINE CLIPPER , ,
.
LOG LINEAR
LINEAR SENSITIVITY “ :
. . .
VIDEO FILTER . . , , .
.
SCAN MODE
. .
SCAN TRIGGER “ : : ; :
. ,
.
.
.
.
. .
.
.
. .
.
. .
. .
. .
.
. . . .
. ... ,. .
. . . .
...
,.
. . . .
. . . .
. ,. .,. .
. . .
0 ,
.,
. ...
. ., .,. .
. . . .
.,,
. .,
. . . . .
. .
.
. .
,,,
. .
. .
.
, .
,,,
.
. .
,.,
. .
. . . .
. . .
. . . .
,,
,, ...
,, .,.
. . .
, ,
, 0
.
.
. . .
,, .,,
.,
. . . .
.
.
,
.
,
,
.
.
,
,
.
.
.
, .
0–110
. . , 30 MHz
. . Centered
. . 300 kHz
.
. . . ZERO
. . . 10 dB
.
, 2 MILLISECONDS
,0,
.
. Max CCW
. , ,
, , LINEAR
. , ,
, 1 mV/DIV
10 kHz
. . . . .
INT
,, . . . ,
. . . . . VIDEO
4-13
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
PERFORMANCE TESTS
4-28. Scan Time Accuracy(cont’d)
608F :
MEGACYCLES
.
.
.
. . .
. . . .
MODULATION . . . . . .
FREQUENCY RANGE . . .
5245L:
SENSITIVITY (VOLTS RMS)
FUNCTION . . . . . . . .
TIME BASE . . . . . . .
ATTENUATION
.
.
.
.
.
.
.
.
. . . . . . .
. . . . . . . .
. . . . . . .
. . . . . . . .
. . .
. . .
. . .
. . .
. . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . ...30
. . . -40dBm
. . .EXTAM
.
. . . B
. . . . . . . . . . . . . . . . - . . . . . . . . 0.1
. . . . . . . . . . . . . . . . PERIOD AVERAGE -(10)
. . . . . . . . . . . . . . . . . .. . . . . .
10
200CD :
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Frequency Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X100
. ,5
2. Adjust the HP 200CD AMPLITUDE for 90%
modulation as indicated on the HP 608F panel
meter.
3. Fine tune the HP 608F Signal Generator for
maximum signal indication of the analyzer
CRT. Adjust LINEAR SENSITIVITY Vernier
control for a convenient display height.
4. Position the first modulation peak directly on
the -5 graticule line by adjusting the
HORIZONTAL POSITION control.
5. Adjust the audio oscillator modulation
frequency to align the tenth modulation peak
with the +4 graticule line (see Figure 4-7).
Total scan time is read on the HP 5245L and
should be 2.0 ±0.2 ms.
2.2 ms
1.8
Figure 4-7. Scan Time Modulation Peaks
6. Repeat steps 4 and 5 to verify the SCAN
TIME PFR DIVISION positions as listed in
Table +4, The approximate HP 200CD
frequency settings and HP 5245L PERIOD
AVERAGE tolerances are also contained in
Table 4-4.
Table 4-4. Modulation Frequencies for Checking Scan Time
SCAN TIME PER DIVISION
0.1 MILLISECONDS
10 kHz
90
110 s
0.2 MILLISECONDS
5 kHz
180
220 s
0,5 MILLISECONDS
2 kHz
450
550 s
1 MILLISECOND
2 MILLISECONDS
1 kHz
500 Hz
0.9
1.8
1.1 ms
200 Hz
100 Hz
SO Hz
20 Hz
10 Hz
5 Hz
4.5
9.0
18.0
40.0
80.0
160
5 MILLISECONDS
10 MILLISECONDS
20 MILLISECONDS
60 MILLISECONDS
0.1 SECONDS
0.2 SECONDS
4-14
Scan Time
HP 200CD Frequency
2.2 ms
6.5 ms
11.0 ms
22.0 ms
60.0 ms
120.0 ms
240.0 ms
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
Table 4-5. Performance Check Test Record
Hewlett-Packard Model 8552B
Test Performed by:
Spectrum Analyzer IF Section
Date:
Serial No.
Para.
No.
4-23
4-24
4-25
4-26
Measurement
Unit
Min
Calibrator Output
Amplitude: -30 dBm ±0.3 dB
Frequency: 30 MHz, ± 3 kHz
millivolts
MHz
676
29.997
Bandwidth Accuracy
Bandwidths: ± 20% 10 kHz Bandwidth: ± 5%
300 kHz Bandwidth
100 kHz Bandwidth
30 kHz Bandwidth
10 kHz Bandwidth
3 kHz Bandwidth
1 kHz Bandwidth
.3 kHz Bandwidth
.1 kHz Bandwidth
.03 kHz Bandwidth
.01 kHz Bandwidth
divisions
divisions
divisions
kHz
divisions
divisions
divisions
divisions
divisions
divisions
Test Description
Bandwidth Selectivity
Bandwidths
300 kHz
100 kHz
30 kHz
10 kHz
1 kHz
0.3 kHz
0.1 kHz
0.03 kHz
0.01 kHz
0.01 kHz
Max
724
30.003
7.2
6.0
7.2
10.5
7.2
6.0
7,2
6.0
1.8
0.6
20:1
20:1
20:1
20:1
20:1
11:1
11:1
11:1
11:1
11:1
— 100
ratio
ratio
ratio
ratio
ratio
ratio
ratio
ratio
ratio
ratio
Hz
Switching Between Bandwidths
±0.5 dB 100 Hz to 300 kHz
±1.0 dB 30 Hz to 300 kHz
±1.6 dB 10 Hz to 300 kHz
4.27
Actual
Amplitude Display
Accuracy at
-10
-20
-30
-40
-50
-60
-70
dB:
dB:
dB:
dB:
dB:
dB:
dB:
±.15
±.15
±.15
±.15
±.15
±.15
±.15
divisions
divisions
divisions
dB
dB
dB
dB
dB
dB
dB
divisions
divisions
divisions
divisions
divisions
divisions
divisions
—
6.85
5.85
4.86
3.85
2.85
1.85
0.85
—
—
—
—
—
0.8
1.6
2.6
7.15
6.15
5.15
4.15
3.15
2.15
1.15
4-15
TM 11-6625-2781-14-1
Performance Tests
Model 8552B
Table 4-5. Performance Check Test Record (cont’d)
Para.
No.
4-28
Min
0.1 MILLISECONDS
s
90
110
0.2 MILLISECONDS
s
180
220
0.5 MILLISECONDS
s
450
550
1 MILLISECONDS
ms
0.9
1,1
2 MILLISECONDS
ms
1.8
2,2
5 MILLISECONDS
ms
4.5
5,5
10 MILLISECONDS
ms
9.0
11.0
20 MILLISECONDS
ms
18.0
22,0
50 MILLISECONDS
ms
40.0
60,0
0.1 SECONDS
ms
80
120
0.2 SECONDS
ms
160
240
Actual
Max
Scan Time
Accuracy at
4-16
Measurement
Unit
Test Description
TM 11-6625-2781-14-1
Model 8552B
Adjustments
SECTION V
ADJUSTMENTS
5-1. INTRODUCTION
5-11. HP 11692A Service Kit
5-2. This section describes adjustments and checks
required to return the analyzer IF section to peak
operating condition when repairs are required.
Included in this section are test setups, procedure,
and tips about tools and test equipment.
Adjustment location photograph are located on
fold-outs at the back of the manual. A test record
for recording data taken during adjustment
procedures is included at the end of this section,
The analyzer must warm up one hour before any
adjustments are attempted.
5-12. The HP 11592A Service Kit is an accessory
item available from Hewlett-Packard for use in
maintaining the spectrum analyzer, No attempt to
adjust the analyzer should be made unless the user
has the service kit.
5-3. EQUIPMENT REQUIRED
5-4. A complete list of test equipment and a list of
accessories are contained in Table 1-2. In addition,
each test procedure contains a list of test equipment and identifies all test equipment and accessories by call-outs. Any equipment substituted for
the instruments or accessories listed must meet the
minimum specifications in order to calibrate the
analyzer.
5-5. Posidriv Screwdrivers
5-6, Many screws in the instrument appear to be
Phillips, but are not. The table of accessories gives
the name and number of the Posidriv screwdrivers
designed to fit these screws. To avoid damage to
the screw slots, the Posidriv screwdrivers should be
used.
5-7. Slug Tuning Tools
5-8. Use HP 8710-1010 and HP 8710-0957 tuning
tools for tuning the slugs in the ferrite inductors in
the IF Section, No other tools should be used for
this purpose.
5-9. Blade Tuning Tools
5-10. For adjustments requiring a nonmetallic
metal-blade tuning tool, use the General Cement
Model No. 5003 (HP 8730-0013). It may be necessary to cut away part of the plastic on the tuning
blade end to use the tool on all the adjustments. In
situations not requiring nonmetallic tuning tools,
an ordinary small srewdriver or other suitable tool
is sufficient. No matter what tool is used, never try
to force any adjustment control in the analyzer.
This is especially critical when tuning variable slug
tuned inductors and variable capacitor.
5-13. Table 1-2 contains a detailed description of
the contents of the service kit. Any item in the kit
may be ordered separately if desired. The wiring in
the 11S92-60015 Extender Assembly is especially
critical and fabrication should not be attempted.
Other items in the kit may be built if desired.
5-14. Extender Cable Installation
5-15. Plug-in Removal. Push the front panel latch
in the direction indicated by the arrow until the
latch disengages and pops out from the panel. Pull
the plug-ins out of the instrument, Locate the
black press-to-release button on the left side of the
RF Section. Press the button and firmly pull the
two sections apart.
5-16. When the two sections separate at the front
panel, raise the upper section until it is above the
lower section by two or three inches at the front
panel. Disengage the metal tab-slot connection at
the rear of the plug-ins and separate the two sections.
5-17. Plug-in Cover Removal
5-18. Remove the bottom cover from the IF Section. Do not remove the shield covers from the
A1/A12, A13 and A8 assemblies in the IF Section
until those assemblies are to be adjusted.
“Some of the maintenance and servicing
operations described herein are performed
with power supplied to the instrument while
protective covers are removed, Be careful
when performing these operations. Line voltage is always present on terminals including
the power input connector, fuse holder,
power switch, etc. In addition, when the in5-1
TM 11-6625-2781-14-1
Model 8552B
Adjustments
strument is on, energy available at many
points may result in personal injury or death
when contacted. ”
lated to preceding or following ones. The following
sets of adjustments are related, and if one adjustment in the set is made, the other procedures in
that set should be checked or adjusted.
5-19. Extender Connections
5-20. Place the plate end of the HP 11592-60015
Extender Assembly in the display section and press
firmly into place so that both plugs make contact.
The plate and plugs cannot be installed upside
down as the plate has two holes corresponding to
two guide rods in the mainframe.
5-21. Connect the upper cable plug to the RF Section and the lower cable plug to the IF Section.
The plugs are keyed so that they will go on correctly and will not make contact upside down.
Connect the HP 11592-60016 Interconnection
Cable Assembly between the RF and IF Sections.
The connectors are keyed by the shape of the plug
and the arrangement of the pins. Press the connectors firmly together and extend the instrument sections as far apart as the cables will allow without
putting stress on the connectors.
5-22. FACTORY SELECTED COMPONENTS
Power Supply Checks and Adjustments (para.
5-27).
Scan Circuits
Horizontal Scan Checks and Adjustments
(para. 5-28),
2. Final Scan Checks (para. 5-29).
1.
Log/Linear Amplifier Circuits
1. Vertical Deflection Amplifier Checks (para.
5-30).
2. Log/Linear Amplifier Checks and Adjustments
(para. 5-31).
3 MHz IF Circuits
1.
300 kHz Bandpass Filter Adjustment (para.
5-32).
2. LC Filter Adjustments (para. 5-33).
3. Crystal Filter Fine Adjustment (para. 5-34).
4. 3 MHz IF Gain Adjustment (para. 5-36).
5-23. Table 5-4 contains a list of factory selected
components by reference designation, basis of selection, and schematic diagram location on which
the component is illustrated. Factory selected components are designated by an asterisk (*) on the
schematic diagrams in Section VIII of this manual.
Converter Circuits
5-24. R ELATED ADJUSTMENTS
30 MHz Calibration Oscillator Check and Adjustment (para. 5-40).
5-25. The adjustment procedures are arranged in
numerical order. Man y adjustments are directly re-
5-2
1. 47 MHz Local Oscillator Automatic Phase
Lock Check and Adjustment (para. 5-37).
2. 50 MHz IF Bandpass Check and Adjustment
(para. 5-38).
3. 44 MHz Rejection Adjustment (para. 5-39).
Analogic Check and Adjustment (para. 5-41).
TM 11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-26. CHECKS AND ADJUSTMENTS
5-27. Power Supply Check and Adjustment
REFERENCE: Schematic 19.
DESCRIPTION: The spectrum analyzer IF Section regulates power fed from the display section. These
checks verify and validate the display section power supply voltages and the regulated voltages in the
spectrum analyzer plug-ins.
Figure 5-1. Power Supply Check and Adjustment Test Setup
EQUIPMENT:
EXTENDER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . .
DIGITAL VOLTMETER
INTERCONNECTION ASSEMBLY” : : : : : : : : : : : :“ : : : : : : .
STRAIGHT-THROUGH VOLTAGE PROBE . . .
VARIABLE VOLTAGE TRANSFORMER , . . . ; : : : : : : : : : : :
AC VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . .
BNC TEE . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.
2.
HP 11592-60015
HP 3440A/3443A
HP 11592-60016
HP 10025A
: : . W5MT3A
. . .
HP 400E
.,. .UG-274 B/U
Connect the test setup shown in Figure 5-1. Measure the dc display voltages with the HP 3440A/3443A
Digital Voltmeter while the analyzer plug-ins are installed on extender cables.
Test Point (to Chassis)
Wire Color
Voltage
P1-9
P1-4, P2-2
P1-6, P2-6
F1, F2
red
wht/red
vio
wht /vio
+250 ± 3 Vdc
+100 ± Vdc
-100 ± Vdc
-12.6 ± Vdc
If the display section supplies need adjustment, refer to the manual provided with the display section
for instructions.
5-3
TM 11-6625-2781-14-1
Model 8562B
Adjustments
ADJUSTMENTS
5-27. Power Supply Check and Adjustment (cont’d)
3.
Connect the digital voltmeter to the IF Section XA5-11 (wht/blk/red lead, Figure 8-8) and measure
+20 ± 0.10 Vdc. Ripple should be < 0.5 mV rms. These tolerances should be maintained as the line
voltage is varied between 103.5 Vac and 126.5 Vac using the variable voltage transformer.
+19.90
+20.10 Vdc
4.
If the +20 Vdc supply is out of tolerance, adjust ASR16 +20V ADJ on the power supply assembly for
+20V ± 0.1 Vdc.
5.
Connect the digital and ac voltmeters to the IF Section XA6-8 (wht/blk/vie) and measure -10 ± 0.01
Vdc. Ripple should be <0.5 mV rms. These tolerances should be maintained as the line voltage is varied
between 103.5 Vac and 126.5 Vac using the variable voltage transformer,
–10.01 Vdc
-8.99
6.
If the –10 Vdc supply is out of tolerance, adjust ASR82 -10V ADJ on the power supply assembly for
–10V ±0.01 Vdc.
5-28. Horizontal Scan Check and Adjustment
REFERENCE: Schematic 15,16.
DESCRIPTION: The SCAN OUT voltage is measured and pre-set in this procedure. The Final Scan Check
(paragraph 5-29) is then performed. The SCAN OUT voltage waveform is observed and adjustments made,
if necessary, to obtain the proper waveform.
Figure 5-2. Scan Generator Check and Adjustment Test Setup
5-4
TM 11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-28. Horizontal Scan Check and Adjustment (cont’d)
EQUIPMENT:
OSCILLOSCOPE
DIGITAL VOLTMETER : : : : : : : : : : : : : : : : : :
EXTENDER ASSEMBLY
INTERCONNECTION ASSEMBLY. : : : : : : : : : : : : : : : :
BNC Tee (2)
C A B L E A S S E M B L Y ( 4 ) ” : : : : : : : : :
CABLE ASSEMBLY. ... .... ... .
HP 180A/1801A/1821A
: : . . . . . . . . . . . . . . .. HP 3440/3443A
HP 11592-60015
: : : : : : : : : : : : : : : : : : : : : : : :HP 11592-60016
UG-274B/U
: : : : : : : : : : : : : : : : H P 1 0 5 0 3 A
.. ... ........ .. HP 11001A
1. Connect the test setup shown in Figure 5-2 and make the following control settings:
ANALYZER:
BASE LINE CLIPPER
SCAN TIME PER DIVISION “ : : : : : :
SCAN MODE
SCAN TRIGGER’ : : : : : : : : : : :
.
. . .
. . .
. . .
. . .
. , , Max ccw
. .
. .
. . .
. .
. . .
. 5 MILLISECONDS
. .
. .
. . .
. .
. . .
. .
. . . 0
INT
. . .
. .
. .
. . .
.
. . . .
. . .
AUTO
180A/1801A/1821A:
HORIZONTAL SCALE
VERTICAL SENSITIVITY ‘ : : : : : : :
EXTERNAL TRIGGER . . . . . . . .
. . .
...
. . .
3440A/3443A:
S A M P L E R A T E . . . . . . . . .
R A N G E
. . .
.
. . . . . . . . .
. .
. . .
. . .
.. ... . . . .
. .
. .
. .
.
.
. .
. . .
..
. . .
. .
...
. .
.
. .
.
. . 10 milliseconds/division
..
... 2 volts/division
trigger on external dc signal
.
. . .
. .
. .
9 o’clock
. . . . . .
AUTO
2. Synchronize the oscilloscope horizontal scan
with the signal from the analyzer SCAN
IN/OUT jack.
3. Observe and measure the SCAN IN/OUT
waveform and compare it against the
waveform shown in Figure 5-3. Rise time
should be 54 ±4 milliseconds.
50
58 ms
4. If rise time of the scan voltage is out of
tolerance. adjust A6R12 SCAN TIME control.
Then proceed with the remainder of the scan
generator adjustments given below.
5. Set the analyzer SCAN TRIGGER to EXT.
Use the digital voltmeter to measure the dc
voltage level at the SCAN IN/OUT jack.
Voltage should be -5.5. ±t 0.02 Vdc.
-5.02 Vdc
Figure 5-3. Scan Voltage Waveform Measurement
6. If the voltage is out of tolerance. adjust
A6R50 -5V ADJ control on the scan generator
assembly.
7. Turn the SCAN TIME PER DIVISION control to 10 SECONDS. SCAN MODE to SINGLE; push the
SINGLE button. (Note: This requires 100 seconds to reach peak.)
8. Observe the SCAN IN/OUT voltage as the scan reaches the right-hand edge of the graticule. The highest
reading should be +5.0 ±0.1 Vdc. Repeat this operation several times to make sure the voltage reading
is correct.
+5.1 Vdc
+4.9
9. If the voltage is out of tolerance, adjust A6R46 SCAN AMPL control on the scan generator assembly
and repeat steps 5 through 8 until both readings are correct.
5-5
TM 11-6625-2781-14-1
Adjustments
ADJUSTMENTS
549. Final Scan Check
REFERENCE: Schematics 15, 16.
DESCRIPTION: A modulated RF signal is connected to the RF INPUT. The demodulated signal on the
analyzer display is used to fine-adjust scan time circuits, Then, the operation of remaining scan circuits is
checked. The analyzer’s front panel calibration procedure (see paragraph 4-12) must be performed before
these checks and adjustments are made.
Figure 5-4. Final Scan Time Adjustment Test Setup
EQUIPMENT”
FREQUENCY COUNTER . .
OSCILLATOR
SIGNAL GENERATOR “ : : :
CABLE ASSEMBLY (2) . . .
CABLE ASSEMBLY
INTERCONNECTING ASSEMBLY
EXTENDER ASSEMBLY . . .
BNC Tee . . . . . . . . .
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. . . .HP 5245L
. . . HP 200CD
. . . . HP 606B
. . . HP 10503A
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. HP 11001A
. . HP 11592-60016
. . HP 11592-60015
. . . . UG-274B/U
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1. Connect the test setup shown in Figure 5-4 and make the following control settings:
ANALYZER:
FREQUENCY . . . . .
FINE TUNE , . . . . .
BANDWIDTH . . . . .
SCAN WIDTH
INPUT ATTENUATION “ :
BASE LINE CLIPPER
SCAN TIME PER DIVISION
LINEAR SENSITIVITY .
LOG-LINEAR . . . . .
5-6
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. . . 50 MHz
. . . Centered
. . 300 kHz
. . . . ZERO
0 dB
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. . . Max ccw
1 MILLISECOND
. . . 1 mV/DIV
. . . . LINEAR
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TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-29. Final Scan Check (cont’d)
ANALYZER Control settings (cont‘d)
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . ..10 kHz
SCAN MODE . . . . . . . . . . . . . . . . . . . . . . . . . ..
. . . . . .INT
SCAN TRIGGER : : : : : : : : : : : : : : : : : : : : : : : : : : :: : VIDEO
606B:
FREQUENCY
30 MHz
ATTENUATOR (dBm) :: : : : : : : : : : : : : : : : : : :: : : :: : : -40
MODULATION SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . .EXT DC
RANGE . . .
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6
5245L:
S E N SI T I V I T Y
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FUNCTION
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TIME BASE
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0.1
PERIOD AVERAGE (10)
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10 ps
2.
Adjust the HP 200CD Audio Oscillator AMPLITUDE for 90 percent modulation as indicated on the
HP 606B Signal Generator.
3.
Fine tune the signal generator for maximum signal indication on the analyzer. Adjust LINEAR
SENSITIVITY controls for a convenient display height.
4.
Adjust the audio oscillator modulation frequency to give a 1.0 ms HP 5245L Period Average reading.
Table 5-1. Modulation Frequencies for Checking Scan Time
SCAN TIME PER DIVISION
1 MILLISECOND
5 MILLISECONDS
10 MILLISECONDS
50 MILLISECONDS
0.1 SECOND
HP 200CD Frequency
=
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1 kHz
200 Hz
100 Hz
20 Hz
10 Hz
HP 5245L Period Average
1.0
5.0
10.0
50.0
100.0
± 1 ms
±0.5 ms
± 1 ms
±10 ms
±20 ms
5.
Position the first modulation peak directly on the -5 graticule line by adjusting the HORIZONTAL
POSITION control.
6.
If the tenth modulation peak does not align with the +4 graticule line, adjust the SCAN TIME control
A6R12 on the Scan Generator Assembly (see Figure 4-7).
7.
Check the scan time limits of the SCAN TIME PER DIVISION positions as listed in Table 5-1 by
setting the first modulation peak in alignment with the -5 graticule line. Then align the tenth
modulation peak with +4 graticule line by slightly changing, if necessary, the modulation frequency
from the audio oscillator (one peak per division). The HP 5245L Period Average readings should be
within the tolerances as listed in Table 5-1. If they are not, readjust A6R12 SCAN TIME for the best
compromise at all SCAN TIME PER DIVISION settings.
8.
To check scan time linearity, set the controls as follows:
SCAN TIME PER DIVISION
Modulation Frequency (HP 200CD) : : : : : : : : : : : : : : : :
2 MILLISECONDS
: . . . . = 500 Hz
5-7
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-29. Final Scan Check (cont’d)
9. Use the HORIZONTAL POSITION control to set the first modulation peak on the -5 graticule line.
Adjust, if necessary, the audio oscillator modulation frequency to position the tenth modulation peak
on the +4 graticule line. The peaks should align with each graticule line ± 0.1 division.
10.
Switch to each position of the SCAN TRIGGER switch and make sure that the scan triggers, To verify
the EXT position, place an ac signal (5 Hz to 50 kHz) at the TRIGGER/BLANK INPUT.
EXT Trigger: 2
20 v p-p
11. To check VIDEO trigger operation, reduce the modulated signal input slowly to 1.5 divisions of
vertical deflection. The scan should continue to trigger down to this level.
V I D E O T R I G G E R : 1 . 5 division_
12. To check the EXT position of the SCAN MODE switch, connect an 8-volt peak-to-peak, 1 kHz
sine-wave signal from the HP 200CD Oscillator to the SCAN IN/OUT jack. A horizontal trace should
appear on the CRT display.
EXT SCAN MODE: 8 V p-p
13. To check MAN position of the SCAN MODE switch, rotate MANUAL SCAN from full ccw to full
The trace should sweep across the CRT display from left to right (at least 10 full divisions
MANUAL SCAN: 10 dvisions
C w.
5-30. Vertical Deflection Amplifier Check
REFERENCE: Schematic 14.
DESCRIPTION: The A4 Crystal Filter Assembly is removed from the IF Section. A 3 MHz signal of known
amplitude is applied at the input (XA4-14) of the LOG REF LEVEL LINEAR SENSITIVITY attenuator.
The VERTICAL POSITION and VERTICAL GAIN controls and 2 dB LOG mode are then checked. A time
domain waveform is then placed on the analyzer by an AM modulated 3 MHz signal at XA4-14. Operation
of the BASE LINE CLIPPER is checked visually on the display.
5-8
TM
11-6625-2781-14-1
Model 8662B
Adjustment
ADJUSTMENTS
5-30. Vertical Deflection Amplifier Check (cont’d)
Figure 5-5. Vertical Deflection Amplifier Teat Setup
EQUIPMENT:
SIGNAL GENERATOR
CABLE ASSEMBLY (with test clip installed)
INTERCONNECTION ASSEMBLY . . .
EXTENDER ASSEMBLY . , . . . , .
ATTENUATOR
CABLE ASSEMBLY : : : : : : : : :
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, HP 606B
. . . HP 10601A
HP 11692-60016
: HP 11592-60015
. . .
, HP 355D
, . , HP 10603A
1. With the analyzer power off, remove the A4 Crystal Filter board from the 8562B.
2. Connect the the setup shown in Figure 6-5, turn analyzer power ON, and set controls as follows:
ANALYZER:
INPUT ATTENUATION
SCAN TIME PER DIVISION
LOG REF LEVEL , . , .
LOG-LINEAR
BASE LINE CLIPPER “ : :
VIDEO FILTER , . . .
SCAN MODE
SCAN TRIGGER . : : : :
606B:
FREQUENCY
ATTENUATOR (dBm) : :
MODULATION SELECTOR
RANGE . . . . . . . .
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. . 2 MILLISECONDS
, . 0 , -20 dBm
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. . . 10 dB LOG
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Max ccw
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INT
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5-9
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-30.
Vertical Deflection Amplifier Check (cont’d)
355D:
ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..100 dB
3. With an input signal at –100 dBm, adjust the front-panel VERTICAL POSITION control. The trace
should move ± 2 vertical divisions as the control is moved through its range.
+2 div
–2
4. Reset the trace to the bottom vertical graticule line. Then increase the signal level to -50 dBm at
XA4-14.
5. Switch LOG LINEAR to LINEAR. Observe the display as the VERTICAL GAIN control is turned
through its full range. The trace should move at least two vertical divisions.
2 div
6. Set LOG-LINEAR to 10 dB LOG; set 606B to –100 dB. Set trace to bottom graticule line with
VERTICAL POSITION.
7. Set 355D to 70 dB; using 606B VERNIER and ATTENUATOR, adjust trace to –70 dB graticule on
CRT.
8. Set 355D to 0 dB. Set trace to LOG REF graticule with VERTICAL GAIN. Check trace alignment and
adjust if necessary.
9. Repeat steps 6 through 8 until trace is split by graticule in each step.
10. Set 355 D to 0 dB. Switch LOG-LINEAR to 2 dB LOG and adjust A7R35 2 dB OFFSET (see Figure
8-8) to set trace to LOG REF graticule.
11. Set 355D to 10 dB. Note the difference between the trace and the –50 dB graticule; adjust A7R35
2 dB GAIN to move the trace to the –50 dB graticule.
12. Repeat steps 10 and 11 until the trace is at LOG REF graticule at 0 dB and a —50 dB graticule at –10
dB.
LOG REF at 0 dB:
(<)
–50 dB at -10 dB.
(d)
13. Make the following control settings:
ANALYZER:
LOG- LINEAR . . . . . . . . . . . .
VIDEO FILTER . . . . . . . . . . .
606B:
MODULATION SELECTOR, ..,, .
MODULATION AMPLITUDE..,.. . .
355D:
ATTENUATION . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . ..10 dB LOG
.’ . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
. . . . . . . . . . . . . . . . . . . ... INT 100Hz
. . . . . . . . . . . . . . . . . . . . . . ...90%
. . . . . . . . . . . . . . . . . . . . . . . . . ...110
14. Turn the BASE LINE CLIPPER until the signal is blanked, The control arrow should indicate between
8 and 12 o’clock,
15. Increase the 356D to 50 dB. Set the SCAN TRIGGER to VIDEO.
16. The scan should trigger on the video signal. Turn the BASE LINE CLIPPER fully clockwise and check
signal clipping.
17. The clipping circuit should function so that two to eight divisions of signal above the base line are
blanked when the BASE LINE CLIPPER is fully clockwise.
8 div
5-10
TM
Model 8552B
11-6625-2781-14-1
Adjustments
ADJUSTMENTS
5-31. Log Linear Amplifier Check and Adjustment
REFERENCE: Schematics 12, 13.
DESCRIPTION: A 3 MHz signal is applied at the input to the LOG REF LEVEL-LINEAR
SENSITIVITY attenuator (XA4-14). The log and linear amplifier circuits are calibrated by varying the
signal amplitude by known increments.
Figure 5-6. Log Linear Amplifier Check and Adjustment Test Setup
EQUIPMENT:
SIGNAL GENERATOR . . . . . . . . . . . . . . . . . .
FREQUENCY COUNTER
CABLE ASSEMBLY (install test clips on unterminated end) : : : : : :
TUNING TOOL, SLOT
STRAIGHT
- THROUGH
VOLTAGE PROBE “ : : : : : : : : : : : : :
DIGITAL VOLTMETER
INTERCONNECTING ASSEMBLY : : : : : : : : : : : : : : : : :
EXTENDER ASSEMBLY . , . . . , . . . . . . . . . . . . . . .
CABLE ASSEMBLY .,...., . . . . . . . . . . . . . . . . .
ATTENUATOR
C A B L E A S S E M B L Y ( 3 ) ” : : : : : : : : : : : : : : : : : : : : : : :
HP 606B
HP 5245L
: : : : : HP 10501A
Gowanda PC-9668
: . . . HP 10025A
HP 3440A/3443A
: . HP 11592-60016
. HP 11592-60015
. .. HP 11001A
HP 355C
: : H P 1 0 5 0 3 A
...*.
.
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1. With the analyzer power off, remove A4 Crystal Filter board.
2. Make the following control settings and then connect the test setup shown in Figure 5-6.
ANALYZER:
LOG LINEAR
L O G
R E F
L E V E L
’ : : : : : : : :
INPUT
ATTENUATION
..,.,.
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: : : : : : : : : : : : : : : : :
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10 dB LOG
2 0 d B m
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...0
dB
5-11
TM 11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-31. Log Linear Amplifier Check and Adjustment (cont’d)
ANALYZER control settings (cont’d)
SCAN TIME PER DIVISION . . . . .
BASE LINE CLIPPER . . . . . . .
VIDEO FILTER ........ . . . .
SCAN MODE
S C A N
T R I G G E R
” ’ . : : : : :
2 MILLISECONDS
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . ‘.. . ..Max ccw
. . . . . . . . . . . . . . . ..10 kHz
INT
: :
: : : : : : : : : : : : : : : :
: : : :
A U T O
3440A/3443A:
SAMPLE RATE ........ . . . . . . . . . . . . . . . . ... ..9 o'clock
AUTO
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
606B:
RANGE . . . . . . . . . . .
FREQUENCY
MODULATION SELECTOR ::
ATTENUATOR – dBm . . . . .
VERNIER . . . . . . . . . . . .
5245L:
SAMPLE RATE . . .
SENSITIVITY . . .
TIME BASE . . .
FUNCTION. .. .......
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3 MHz (±1 kHz)
: : : : : : : : : : : : : : : : : . . . . . . CW
-110
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. . . . . . . . . . . . Set for 0on meter dB scale
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9 o’clock
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(volts rms)
. . . .1 s
FREQUENCY
355C:
ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dB
3.
Turn the analyzer power on and connect a 3 MHz ±1 kHz CW signal from the 606B to pin XA4-14.
With an input signal of -110 dBm adjust the VERTICAL POSITION control to set the base line on
the bottom graticule line.
4.
Increase the signal generator level to –40 dBm and adjustA8L12 detector tuning on Service Sheet 13
for maximum vertical deflection on the trace, Repeat –110 dBm adjustment if necessary.
NOTE
Steps 5 and 6 may require iteration.
5.
Increase the signal level to +10 dBm. Adjust the VERTICAL GAIN control for eight divisions of
vertical deflection,
6.
Decrease the signal generator level to -60 dBm and set ATTEN VERNIER on 606B for 1,0 division
deflection of the vertical display. Retain this ATTEN VERNIER setting through step 14,
7.
Repeat steps S and 6, then increase the signal level 20 dB (do not move 606B ATTEN VERNIER) and
set LOG-LINEAR to LINEAR.
8.
Adjust A8R52, LINEAR GAIN (sets basedrive to Linear Scale Factor Amplifier) for 7,07 divisions of
vertical deflection. Measure the dc voltage present at the VERTICAL OUTPUT jack with a digital
voltmeter. Record the voltage.
VERTICAL OUTPUT Voltage:
9.
Set the HP 355C attenuation to 4 dB and turn LINEAR SENSITIVITY to 20 ~V/DIV, Adjust 4 dB
ADJ A8R63 to the reference voltage in step 8, ±6 m Vdc. Repeat step 8 if necessary.
10. With the analyzer power off, remove the A7 Deflection Amplifier Assembly,
5-12
TM
Model 8552B
11-6625-2781-14-1
Adjustments
ADJUSTMENTS
5-31. Log·Linear Amplifier Check and Adjustment (cont’d)
11. Set the HP 355C to 0 dB; set the HP 606B Signal Generator 3 MHz level to -110 dBm, and set
LOG LINEAR to 10 dB LOG (LOG REF LEVEL at -20 dBm).
12. Turn the analyzer on and measure the dc voltage with the HP 3440A/3443A Digital Voltmeter and
straight-through voltage probe (HP 10025A) connected to XA8-14. The dc level should measure
more negative than -6 m Vdc.
-6 m Vdc
13. Increase the signal generator level to +10 dBm. The signal level at XA8-14 should be -800 ±40
m Vdc.
-840
-760 m V
14. Decrease the signal generator level in 10 dB steps (to -60 dBm). For each 10 dB reduction, the dc
level at XA8-14 should change by 100 ±40 m Vdc.
Signal Generator
Level at XA4-14
0 dBm
-10 dBm
-20 dBm
-30 dBm
DC Level at XA8-14
-740
-640
-540
-440
mVdc
mVdc
mVdc
mVdc
—
—
—
_
-660
-560
-460
-360
Signal Generator
Level at XA4-14
DC Level at XA8-14
-40 dBm
-50 dBm
-60 dBm
-340 mVdc _ -260
-240 mVdc _ -160
-140 mVdc _ - 60
15. Turn the analyzer power off and re-install the A7 Deflection Amplifier assembly.
16. Turn the analyzer power on. Check vertical position, Step 3. Set the LOG·LINEAR switch to
LINEAR. Set the signal generator output to -30 dBm.
17. Adjust the generator output level vernier for a full eight division display on the analyzer.
18. Carefully reduce the signal input to the analyzer at XA4-14 by the amounts shown in the table
below using the HP 355C and HP 606B output attenuators. Deflection should be ±0.2 division for
the levels indicated.
Input at XA14-14
Reference: -30 dBm (approx.)
Add: 6 dB attenuation
Add: 6 dB attenuation
Add: 8 dB attenuation
Add: 10 dB attenuation
Add: 40 dB attenuation
CRT Display: Deflection in Divisions
8.0
4.0
2.0
0.8
0.25
0
±0.2
±0.2
±0.2
±0.2
±0.2
19. Reinstall A4 Crystal Filter Assembly.
5-13
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-32. 300 k Hz Band pass Filter Adjustment
REFERENCE: Schematics 6, 7.
DESCRIPTION: The 300 kHz bandpass filter is adjusted for symmetry and center frequency. Then the
300 kHz bandwidth is checked.
EQUIPMENT:
CABLE ASSEMBLY
HP 10503A
INTERCONNECTING ASSEMBLY . . . . . . . . . . . . . . . . . . . HP 11592-60016
EXTENDER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . HP 11592-60015
TUNING TOOL . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8710-0095
1. Install the analyzer plug-ins on the two extender cable assemblies, connect CAL OUTPUT to RF
INPUT and make the following control settings:
ANALYZER:
INPUT ATTENUATION
20 dB
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . .
3kHz
SCAN WIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PER DIVISION
SCAN WIDTH PER DIVISION
. . . . . . . . . . . . . . . . . . . .
5 kHz
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 MHz
FINE TUNE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Centered
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . . .10 MILLISECONDS
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 kHz
TUNING STABILIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . On
SCAN MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INT
SCAN TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LINE
LOG·LINEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .LINEAR
LINEAR Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lm V/DIV
BASE LINE CLIPPER . . . . . . . . . . . . . . . . . . . . . Max
ccw
2. Place the A2 3 MHz Amplifier assembly on an extender and install it in the analyzer. Center
the signal on the CRT display with the FINE TUNE control.
3. Set BANDWIDTH to 300 kHz and SCAN WIDTH PER DIVISION to .05 MHz.
4. Adjust A2A1L2, A2A1L4 and A2R1 for a smooth, symmetrical wave shape centered on the CRT
display.
5. Set SCAN WIDTH PER DIVISION to 5 kHz and BANDWIDTH to 3 kHz. The display should
remain centered, Return these controls to .05 MHz and 300 kHz, respectively.
6. Install the circuit board without the extender. Readjust A2R1 IMP if necessary.
7. Check 300 kHz bandwidth, paragraph 4-24: 300 kHz ±60 kHz
240
360 kHz
8. If necessary, repeat adjustment procedure.
9. Switch BANDWIDTH to 10 kHz. The peak amplitude should remain the same ±0.4 division. If not,
perform the LC Filter Adjustment, paragraph 5-33.
5-14
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-33. LC Filter Adjustment
REFERENCE: Schematic.
DESCRIPTION: The LC Filter circuits (100, 30 and 10 kHz bandwidths) are peaked and centered. The
10 kHz gain control is set so that the 10 kHz bandwidth has the same gain as the 300 kHz bandwidth.
Then the gain and bandwidth of the filters are checked.
EQUIPMENT:
CABLE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
TUNING TOOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8710-0095
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11592-60016
EXTENDER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . HP 11592-60015
1. Install the analyzer plug-ins on the two extender cable assemblies; connect CAL OUTPUT to RF
INPUT, and make the following control settings:
ANALYZER:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 MHz
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 k H z
S C A N W I D T H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PER DIVISION
SCAN WIDTH PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . . . 5kHz
INPUT ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 20dB
TUNING STABILIZER
. . . . . . . . . . . . . . . . . . . . . . . . 10
MILLISECONDS
SCAN TIME PER DIVISION
L O G - L I N E A R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .LINEAR
LINEAR SENSITIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 m V/DIV
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10kHz
S C A N M O D E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .INT
SCAN TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AUTO
2. Center the signal as carefully as possible on the CRT display with the FINE TUNE control.
3. Set BANDWIDTH to 10 kHz and SCAN WIDTH to ZERO. Peak A1C4, A1C10, A1C16 and A1C22
for maximum trace deflection on the display.
4.
a.
If one of the PEAK capacitors is at the end of its range (or if an inductor has been replaced)
remove the circuit board from the analyzer.
b. Free the related inductor core with acetone and center the capacitor.
c.
InstaIl the circuit board on the extender. Perform steps 1 through 3 except tune the inductor,
rather than the capacitors.
d. Re-glue the inductor, using Duco cement, and re-install the circuit board without the extender.
e.
Again perform steps 1 through 3.
5. Set SCAN WIDTH to PER DIVISION and BANDWIDTH to 300 kHz. Use LINEAR SENSITIVITY
to set signal for a 7.0 division display.
6. Set BANDWIDTH to 10 kHz and adjust A1R35 10 kHz ADJ for a 7.0 division display.
7. Install the shield cover and check the change in signal amplitude on the display as BANDWIDTH is
switched from 300 kHz to 10 kHz. Deflection at these bandwidths should be within ±0.4 division
of 300 kHz.
5-15
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-33. LC Filter Adjustment (cont’d)
300 kHz:
Reference
100 kHz:
-0.4
+0.4 div
30 kHz:
-0.4
+0.4 div
10 kHz:
-0.4
+0.4 div
8. Set BANDWIDTH to 3 kHz. Again the signal amplitude should not change more than ±0.4 divisions;
if it does, perform the crystal filter adjustment, paragraph 5-34.
300 kHz:
Reference
-0.4
+0.4 div
100 kHz Bandwidth: 80
120 kHz
30 kHz Bandwidth: 24
36 kHz
3 kHz:
9. Check 100, 30 and 10 kHz bandwidths, paragraph 4-24.
10 kHz Bandwidth: 9.5
10.5 kHz
10. If necessary, repeat adjustment procedure.
5-34. Crystal Filter Fine Adjustment
REFERENCE: Schematics 10 and 11.
DESCRIPTION: This procedure fine adjusts the crystal filters for bandwidth and amplitude. If
component changes are made, Coarse Adjustment (paragraph 5-35) may be necessary. The center
frequency of the last four stages is referenced to the first stage, then all five stages are nulled. Next, the
bandwidth amplitudes are set. Finally, the filters are checked for bandwidth and amplitude.
EQUIPMENT:
SIGNAL GENERATOR . . . . . . . .
OSCILLATOR
SYNCHRONIZER
FREQUENCY COUNTER . . . . .
CABLE ASSEMBLY (6) . . . . . . .
INTERCONNECTING ASSEMBLY . . . .
EXTENDER ASSEMBLY . . . . .
OSCILLOSCOPE . . . . . . . . . . . . . . .
CABLE ASSEMBLY . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . HP 606B
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP
8708A
. . . . . . . . . . . . . . . . . . . HP 5245L
. . . . . . . . . . . . . . . . . . . HP 10503A
. . . . . . . . . . . . . . . . . . . . . HP 11592-60016
. . . . . . . . . . . . . . . . .HP 1592-60015
. . . . . . . . . . . . . . . . . . . . . .HP 180A/1801A/1821A
. . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 10501A
1. Remove A2 3 MHz Amplifier Assembly, connect the test setup in Figure 5-7 and make the
following control settings:
ANALYZER:
FREQUENCY
TUNING STABILIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BANDWIDTH . .
. . . . . . . . . . . . . . .
SCAN WIDTH
SCANWIDTHPERDIVISION . . . . . . . . . . . . . . . . . . . . . . . .
INPUT ATTENUATION . . . . . . . . . . . . .
BASE LINE CLIPPER
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . .
5-16
30 MHz
. . . . . . . . . . . . . . . . . . . . . On
. . . . . . ...01 kHz
PER DIVISION
1 MHz
. . . . . . . . . . . . . .
. . . . . . . . . .20dB
Max ccw
. . . . . . . . . . .MILLISECONDS
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-34. Crystal Filter Fine Adjustment (cont’d)
Figure 5-7. Crystal Filter Fine Adjustment Test Setup
ANALYZER control settings (cont’d)
LINEAR SENSITIVITY
VIDEO FILTER
LOG-LINEAR
SCAN MODE
SCAN TRIGGER
606B:
RANGE . . .
FREQUENCY
MODULATION
ATTENUATOR (dBm)
VERNIER . .
8708A:
FREQUENCY RANGE
RF INPUT
MODULATION
FREQUENCY TUNING
AC-DC . . . . . . . .
5245L:
SAMPLE RATE . . . .
TIME BASE . . . . . .
.
.
.
.
20 µ V/DIV
. . 10 Hz
. LINEAR
. .
INT
.
AUTO
. . . . . 4
. . . 3 MHz
. . . . CW
. . . . -30
Set for 0 on dB meter
4
Under lit lamp
CW
Centered
AC
9 o’clock
1s
5-17
TM
11-6625-2781-14-1
Adjustments
ADJUSTMENTS
5-34. Crystal Filter Fine Adjustment (cont’d)
5245L settings (cont’d)
FUNCTION
SENSITIVITY . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . .
180A:
VOLTS/DIV . . . . . . . . . . . . . . . .
TIME/DIV . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .01
. . . . . . . . . . . . . . . 1 MSEC
FREQUENCY
0.1 (volts rms)
2. Tune the synchronizer for 3 MHz ±10 Hz, connect oscilloscope probe to A4TP6, then tune the
synchronizer for a peak on the oscilloscope.
3. Remove the probe from TP6 and reduce LINEAR SENSITIVITY until trace appears on analyzer’s
CRT display. Adjust A4C30, 43, 57 and 70 for maximum trace deflection.
4.
Repeat steps 2 and 3. Then remove the clip leads at XA1-14 and install A2 3 MHz Amplifier
Assembly.
5. Connect CAL OUTPUT to RF INPUT and make the following control settings:
ANALYZER:
3 kHz
BANDWIDTH
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 MILLISECONDS
LINEAR SENSITIVITY . . . . . . . . . . . . . . . . . . . .1 mV/DIV
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . .
. . 10 kHz
6.
Center signal on display with FREQUENCY control and reduce SCAN WIDTH PER DIVISION to 1
kHz.
7.
Adjust A4C19, 34, 47, 61 and 74 to null the signal. Set the signal to the 7 graticule line with LINEAR
SENSITIVITY vernier.
8.
Set BANDWIDTH to 1 kHz; signal level should not change more than ±0.3 division.
9.
If signal is out of limits, repeat steps 6 and 7.
10. Set SCAN WIDTH to ZERO and make the BANDWIDTH changes and adjustments indicated below.
Re-peak the signal with FINE TUNE every time BANDWIDTH is changed.
BANDWIDTH
5-13
I
Adjust for 7.0 Divisions
0.3 kHz
A4R129
300 Hz
0.1 kHz
A4R126
100 Hz
.03 kHz
A4R122
30 Hz
.01 kHz
A4R115
10 Hz
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-34. Crystal Filter Fine Adjustment (cont’d)
11. Repeat steps 8 through 10 until the bandwidth amplitude variations from 3 kHz through 0.1 kHz are
as shown below:
3 kHz:
Set for 7 div
1 kHz:
6.7
7.3 div
0.3 kHz:
6.7
7.3 div
6.7
7.3 div
0.1 kHz:
7.5 div
6,5
0.03 kHz:
7.0 div
0.01 kHz:
6.0
12. Place the A4 Crystal Filter Assembly on an extender. Set BANDWIDTH to 3 kHz, peak the trace
with FINE TUNE and set the trace to the 7 graticule with LINEAR SENSITIVITY vernier.
13. Set BANDWIDTH to 300 kHz and adjust A4R133 to set the trace to the 7 graticule line,
14. Install the A4 Crystal Filter Assembly without the extender. Repeat steps 12 through 14 until the
bandwidth amplitude variation between 3 kHz to 300 kHz less than ±0.3 divisions.
6.7
7.3 div
15. Perform the bandwidth checks for the 3 kHz through .01 kHz bandwidths, paragraphs 4-24, 4-25:
BANDWIDTH
3
1
0.3
0.1
.03
.01
kHz
kHz
kHz
kHz
kHz
kHz
3 dB Bandwidth
4.8
4.0
4.8
4.0
1.2
0.4
7.2
,6.0
7.2
6.0
1.8
0.6
60 dB/3 dB Bandwidth Ratio
div
div
div
div
div
div
11:1
11:1
11:1
11:1
11:1
11:1
div
div
div
div
div
div
16. If necessary, repeat adjustment procedure.
5-19
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-35. Crystal Filter Coarse Adjustment
REFERENCE: Schematics 10 and 11.
DESCRIPTION: This procedure adjusts A4C18, 32, 45, 59 and 73; it coarse adjusts A4C19, 34, 47, 61
and 74. It should be performed only if component changes that would affect the crystal alignment are
made, The crystal filter circuits are adjusted, in turn, by bypassing all but the stage being adjusted; they
are adjusted for center frequency, symmetry and null.
NOTE
This procedure can be difficult and time consuming and should not be attempted
unless the Fine Adjustment procedure will not align the filters.
EQUIPMENT:
CRYSTAL FILTER BYPASS NETWORK (4) . . . . . . . . . . . . . . . . .(See Step 9)
CABLE ASSEMBLY
HP 10503A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11592-60016
INTERCONNECTING ASSEMBLY
EXTENDER ASSEMBLY
. . . . . . . . . . . . . . . . . . . HP 11592-60015
1. Install the analyzer plug-ins on the two extender cable assemblies, connect CAL OUTPUT to RF
INPUT, and make the following control settings:
ANALYZER:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 MHz
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3kHz
PER DIVISION
SCAN WIDTH
.05 MHz
SCAN WIDTH PER DIVISION
INPUT ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10dB
TUNING STABILIZER
On
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MILISECONDS
LOG-LINEAR
10 dB LOG
LOG REF LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 dBm
VIDEO FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10kHz
INT
SCAN MODE
SCAN TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUTO
2.
Place the A4 Crystal Filter Assembly on an extender board and install it in the analyzer. Place the
four Crystal Filter Bypass Networks across: TP2 to TP7, TP3 to TP8, TP4 to TP9 and TP5 to
TP10.
3.
Center the signal on the CRT display with the FREQUENCY control. Use the LOG REF LEVEL
controls to set signal peak at LOG REF graticule.
4.
Tune A4C19 and A4C18 respectively for signal null and symmetrical skirts (60 dB down).
NOTE
Oscillations sometimes occur when the Crystal Filter board is on the Extender board and
the Crystal Filter Bypass Networks are being used, Place your fingers across the last
Crystal Filter Bandpass Network. This will dampen the oscillations while the adjustment
are being made.
5.
Perform Step 4 for each of the Filter stages in turn, as indicated:
5-20
TM
11-6625-2781-14-1
Model 8552B
Adjustrnents
ADJUSTMENTS
5-35. Crystal Filter Coarse Adjustment (cont’d)
Place Bypass Networks
Across Test Points
Tune for null and symmetrical
skirts (60 dB down)
1 and 6, 3 and 8
4 and 9, 5 and 10
A4C34 and A4C32
1 and 6, 2 and 7
4 and 9, 5 and 10
A4C47 and A4C45
1 and 6, 2 and 7
3 and 8, 5 and 10
A4C61 and A4C59
1 and 6, 2 and 7
3 and 8, 4 and 9
A4C74 and A4C73
6. Repeat steps 4 and 5.
7. Remove the Bypass Networks and install A4 assembly without an extender.
8. Perform Crystal Filter Fine Adjustment, paragraph 5-34.
9. Assemble four Crystal Filter bypass networks from parts listed below:
a.
4 capacitors – .047 microfarad 10% HP 0170-0040
b. 4 resistors – 3.3 ohm 5% HP 0683-0335
c.
8 receptacles – for .040 inch pin HP 1200-0063
Figure 5-8. Crystal Filter Bypass Network
5-21
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-36. 3 MHz IF Gain Adjustment
REFERENCE: Schematics 6,7,8.
DESCRIPTION: The amplifier gain controls are adjusted for various positions of the LOG REF LEVEL
attenuator and then the remaining positions of the LINEAR SENSITIVITY dial are checked. The
VERTICAL OUTPUT circuit adjustment is set for output voltage with full-scale display deflection.
Figure 5-9. 3 MHz IF Gain Adjustment Test Setup
EQUIPMENT:
SIGNAL GENERATOR . . . . . . . . . . . . . . .
DIGITAL VOLTMETER . . . . . . . . . . . . . . .
ATTENUATOR . . . . . . . . . . . . . . . . . .
ADAPTER
INTERCONNETING ASSEMBLY . . . . . . . . . . . . . . .
EXTENDER ASSEMBLY . . . . . . . . . . . . . . .
ATTENUATOR
CABLE ASSEMBLY(3) . . . . . . . . . . . . . . . . .
. . . . . . . . . . . HP 606B
. . . . . . . HP 3440A/3443A
. . . . . . . . . .. HP 355C
. HP 1258-0216
. . . . . . . . . . HP 11592-60016
. . . . . . . .HP 11592-60015
. . . . . . . . . . . HP 10503A
1. Remove the cover shield from the Al LC Filter Assembly, connect the test setup shown in Figure
5-9 and make the following control settings:
ANALYZER:
FREQUENCY
TUNING STABILIZER . . . . . . .
BANDWIDTH . . . . . . . . .
SCAN WIDTH
INPUT ATTENUATION . . . . . . . . .
SCAN TIME PER DIVISION . . .
LINEAR SENSITIVITY . . . . . .
LOG·LINEAR
BASE LINE CLIPPER . . . . . . . .
5-22
30 MHz
. . . . . . . . . . . . . . . . . . . . . . . .
On
. . . . . . . . . . . . . . . . . . . 100 kHz
. ZERO
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dB
. . . . . . . . . . . . . . . .
2 MILLISECONDS
. . . . . . . . . . . . . . . . . . . 1 mV/DIV
LINEAR
. . . . . . . . . . . . . . . . . . . . . . . . . . .Max ccw
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-36. 3 MHz lF Gain Adjustment(cont’d)
ANALYZER control settings (cont’d)
SCAN MODE
SCAN TRIGGER
VIDEO FILTER
606B :
FREQUENCY
ATTENUATOR (dBm)
RANGE
MODULATION SELECTOR
VERNIER
INT
AUTO
OFF
30 MHz
-20
5
CW
Set for 0 dB on meter
3440A/3443A:
SAMPLE RATE
RANGE
9 o’clock
AUTO
355C and 355D:
0 dB
2.
Adjust FREQUENCY control for maximum trace deflection.
3.
Adjust signal generator output so that VERTICAL OUTPUT voltage is -1.000 ±0.005 Vdc.
4.
Increase test attenuators by 12 dB.
5.
Turn LOG REF LEVEL vernier to -12 dB.
6.
Adjust A2R44 12 dB ADJ for -1.000 ±0.005 Vdc.
7.
Decrease test attenuators by 12 dB.
8.
Turn LOG REF LEVEL vernier to 0 dB.
9.
Adjust A2R51 0 dB ADJ for -1.000 ±0.005 Vdc.
10. Repeat adjustments in steps 4 through 9 to minimize interaction between controls.
11. Set test attenuator to 6 dB.
12. Turn LOG REF LEVEL vernier to -6. Note error from 1.000 Vdc and adjust HP 606B output for
-1.000 Vdc minus error.
13. Set test attenuator to 12 dB and repeat steps 5 through 10.
5-23
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-36, 3 MHz IF Gain Adjustment (cont’d)
14. Measure the LOG REF LEVEL vernier accuracy at each dB mark by the substitution method
employed in steps 4 through 9. The VERTICAL OUTPUT voltage at each step should be -1.000
±0.04 Vdc.
-1 dB -0.96
1.04 Vdc
-7 dB
-0,96
-1.04 Vdc
-2 dB -0.96
-1.04 Vdc
-8 dB
-0,96
-1.04 Vdc
-3 dB -0.96
-1.04 Vdc
-9 dB
-0.96
-1.04 Vdc
-4 dB -0.96
-1.04 Vdc
-10 dB -0.96
-1.04 Vdc
-5 dB -0.96
-1.04 Vdc
-11 dB -0.96
-1.04 Vdc
-6 dB -0.96
-1.04 Vdc
-12 dB -0.96
-1.04 Vdc
15. Change the control settings as follows:
ANALYZER:
INPUT ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . 10 dB
0 dBm
LOG REF LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 dB LOG
LOG-LINEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . .
606B :
ATTENUATOR (dBm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..0
355D and 355C:
ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10dB
16. Tune FREQUENCY control for maximum trace deflection.
17. Note reference voltage at VERTICAL OUTPUT.
Reference Voltage <-600 mV (more negative) :
18. Adjust 3 MHz IF Gain positions as follows:
Test
Attenuator
10
20
30
40
50
5-24
dB
dB
dB
dB
dB
LOG REF LEVEL
-10
-20
-30
-40
-50
dBm
dBm
dBm
dBm
dBm
Adjust
A1R59
A1R58
A2R21
A2R24
A2R27
Error Limit: ±2 mVdc
(from Reference Voltage)
-2
-2
-2
-2
-2
+2
+2
+2
+2
+2
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-36. 3 MHz IF Gain Adjustment (cont’d)
19. Check the remaining attenuator steps as follows:
a.
Connect a shorting strap between the green and blue wires on the LOG REF LEVEL switch
A10S1-2R.
b. Set LOG-LINEAR control to LINEAR and test attenuators to 43 dB.
c.
Set LINEAR SENSITIVITY to 0.1 m V/DIV with INPUT ATTENUATION at 10 dB.
d. Measure the voltage at the VERTICAL OUTPUT jack.
Reference Voltage:
e.
Check the remaining LINEAR SENSITIVITY positions according to the table below:
Test Attenuator
43
33
23
13
3
f.
dB
dB
dB
dB
dB
LINEAR SENSITIVITY
0.1
0.2
1.0
2.0
10.0
mV/DIV
mV/DIV
mV/DIV
mV/DIV
mV/DIV
Error Limit: ±15 mVdc
-15
-15
-15
-15
-15
+15
+15
+15
+15
+15
Remove the shorting strap installed in step a on page 5-24.
5-37. 47 MHz LO Automatic Phase Lock Check and Adjustment
REFERENCE: Schematics 3, 4, 5.
DESCRIPTION: The oscillator levels are set and checked and the phase lock loop is checked. The
summing and shaping circuits are then adjusted by applying dc offsets and adjusting for a linear 47 MHz
Lo sweep.
5-25
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-37.47 MHz LO Automatic Phase Lock Check and Adjustment (cont’d)
Figure 5-10. 47 MHz LO Automatic Phase Lock Test Setup
EQUIPMENT:
FREQUENCY COUNTER . . . . . .
OSCILLOSCOPE
SIGNAL GENERATOR . . . . . . . . . . . . . .
PULSE GENERATOR . . . . . . . .
POWER SUPPLY
6-PIN EXTENDER BOARD . . . . . . . . . . . . . .
5-26
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HP
. . .
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. . .
HP 5245L/5261A
180A/1801A/1820A
. . .
HP 608F
. . .
HP 222A
. . . HP 6217A
.
HP 5060-5914
TM 11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-37. 47 MHz LO Automatic Phase Lock Check and Adjustment (cont'd)
EQUIPMENT (cont’d)
EXTENDER ASSEMBLY
INTERCONNECTING ASSEMBLY.
CABLE ASSEMBLY . . . . . .
CABLE ASSEMBLY . . . . . . .
CABLE ASSEMBLY (w/test clips) .
DIGITAL VOLTMETER . . . .
ADAPTER
CABLE ASSEMBLY . . . . . . . . .
CABLE ASSEMBLY (w/test clips) .
. . . . .
ALIGNMENT
TOOL
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HP
HP
HP
. .
11592-60015
11592-60016
11592-60001
HP 10503A
HP 10501A
HP 3440A/3443A
. .
UG-201A/U
. .
HP 11000A
. .
HP 11002A
HP 8710-0957
1. Connect the test setup in Figure 5-10. Remove the A1/A12 Assemblies cover shield and the A13
2 MHz VTO Assembly, and make the following control settings:
ANALYZER:
FINE TUNE
SCAN TIME PER DIVISION
BANDWIDTH
TUNING STABILIZER
SCAN WIDTH
SCAN WIDTH PER DIVISION
VIDEO FILTER
SCAN MODE
SCAN TRIGGER .
LOG·LINEAR
LOG REF LEVEL
50 MILLISECONDS
. . . . 1 kHz
. . . . . . . .. OFF
PER DIVISION
. . . 20 kHz
. . . .
OFF
. . . .
INT
. . .
AUTO
10 dB LOG
-40 dBm
180A/1801/1820:
VOLTS/DIV
TIME/DIV .
Probe . . .
.0.5 MSEC
. .
X10
5245L/5261A:
SENSITIVITY
SAMPLE RATE
TIME BASE .
FUNCTION .
SENSITIVITY (PLUG-IN)
PLUG IN
. . . ccw
. . . 1s
FREQUENCY
30 mV RMS
608F:
MODULATION . . . .
ATTENUATION . . .
MEGACYCLES . . . .
EXT PULSE
. . . -20 dBm
50
.. . . .
222A:
REF RATE
PULSE WIDTH. . . . . . .
PULSE AMPLITUDE
PULSE POLARITY . . .
10K – 100K
5 (vernier ccw)
. . . . . . . 2V
. . . . . . . . +
2. Attach oscilloscope probe to A12TP2. Adjust A12T1 for maximum; signal level should be 650 ±200
mV p-p.
450
850 mV p-p
5-27
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-37. 47 MHz LO Automatic Phase Lock Check and Adjustment (cont'd)
3. Remove oscilloscope probe and attach frequency counter to A12TP2. 45 MHz Crystal Oscillator
frequency should be 45 MHz ±10 kHz.
44.990
45.010 MHz
4. Attach oscilloscope probe to feedthrough capacitor C8 (see Figure 8-8) and set oscilloscope
VOLTS/DIV to 0.2 and TIME/DIV to 5 msec. Search waveform should be as shown in Figure 5-11
with amplitude from 8.5 to 11.5 V pp.
8.5
11.5 v p-p
Figure 5-11. Search Waveform
5. Remove oscilloscope probe from C8 and attach to J8 (see Figure 8-8); set oscilloscope VOLTS/DIV
to .05 and TIME/DIV to 5 msec. The 47 MHz LO level should be 2.OV±0.5.
1.5V
2.5 V p-p
6. Remove oscilloscope probe from J8 and re-attach to feedthrough C8. Insert A13 2 MHz VTO
Assembly into 8552B on 6-pin extender board. 47 MHz LO phase lock will be indicated by the 50
Hz square wave becoming steady dc.
NOTE
If square wave does not become steady dc, adjust 47 MHz LO (A3A2L1) as specified in
step 16. Then repeat steps 4 through 6.
7. Remove oscilloscope probe from C8 and attach to A13TP1, Set oscilloscope VOLTS/DIV to ,02
and TIME/DIV to 5 msec. Adjust A13R5 VTO LEVEL ADJ for 900 ±250 mV p-p.
660
1150 mV p-p
8. Disconnect oscilloscope probe and attach frequency counter to A13TP1. Switch analyzer SCAN
WIDTH to ZERO. With alignment tool, adjust A13T1 for 2 MHz ±2 kHz. (FINE TUNE must be
centered and TUNING STABILIZER must be off.)
1998
5-28
2002 kHz
TM
Model 8552B
11-6625-2781-14-1
Adjustments
ADJUSTMENTS
5-37. 47 MHz LO Automtic Phase Lock Check and Adjustment(cont'd)
9.
Remove A13 2 MHz VTO and re-install in 8552B without extender.
NOTE
The following steps of this paragraph should be omitted if the RF Section being used is
an 8554 or 8555.
Turn analyzer POWER off. Unsolder yellow wire at 8552B XA5 pin 3 and connect power supply
positive lead to XA5 pin 3 (connect negative lead to chassis ground.) Adjust power supply for +7.50
V with digital voltmeter.
10. Connect pulse generator to frequency counter. Adjust REP RATE VERNIER for 20.000 kHz, then
connect pulse generator to signal generator. Disconnect W7-50 MHz, white coax at J6 (see Figure
8-8). Connect the signal generator output to J6. Set analyzer SCAN WIDTH to PER DIVISION
(SCAN WIDTH PER DIVISION should be 20 kHz).
11. Turn analyzer POWER on and observe signal on Display Section CRT.
12. Adjust A5R45 SHAPING ADJ for optimum linearity, aligning the pulses of the modulated signal or.
the vertical graticule lines. Adjust frequency of signal generator to keep pulses aligned on graticule
lines as adjustment is made. Pulses should not deviate more than ±0.75 minor divisions from
graticule lines across entire display.
Max. deviation: 0.75
0.75 minor div
13. Change power supply to put -7.50V at XA5 pin 3. Adjust A5R71 OFFSET ADJ for optimum
linearity, aligning pulses on vertical graticule lines and adjusting signal generator frequency as
necessary to keep pulses on graticule lines. Pulses should not deviate more than ±0.75 minor
divisions horn graticule lines across entire display.
Max. deviation 0.75
0.75 minor div
14. Set the power supply to 0V and check to see that the pulses do not deviate more than ±0.75 minor
divisions from vertical graticule lines across entire display.
Max. deviation 0.75
0.75 minor div
15. Repeat steps 8 through 14 until no further adjustments are necessary to meet the specifications in
each step. (Yellow wire at XA5 pin 3 can remain unsoldered until adjustments are completed.)
16. Set analyzer SCAN WIDTH to ZERO and attach DVM to feedthrough C8. Phase lock error signal
should be +4 ±0.4V, If not, adjust A3A2L1 (accessible through hole in A3A2 cover).
+3.6
+4.4V
17. Turn the analyzer POWER off, reconnect W6 to J6 and resolder yellow wire to XA6 pin 3.
Remove test W equipment connections from analyzer and reinstall the cover shields to the A13 and
A1/A12 Assemblies,
5-38, 50 MHz IF Bandpass Check and Adjustment
REFERENCE: Schematic 3.
DESCRIPTION: The 50 MHz IF bandpass is checked by manually sweeping the 47 MHz Local
Oscillator over a 200 kHz range and viewing the analyzer display for flatness. For adjustment, the 50
MHz IF is swept using a flat external source. The output is detected, filtered and displayed on an
oscilloscope. The band pass filter is adjusted for frequency, amplitude, width and flatness.
5-29
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-38. 50 MHz IF Bandpass Check and Adjustment (cont’d)
Figure 5-12. 50 MHz IF Bandpass Adjustment Test Setup
EQUIPMENT:
GENERATOR/SWEEPER . . . . . . . . .
OSCILLOSCOPE with 1801A/1821A PLUG-INS
FREQUENCY COUNTER . . . . . . . .
AMPLIFIER
CRYSTAL DETECTOR . . . . . . . . . . . .
CABLE ASSEMBLY
CABLE ASSEMBLY (3) . . . . . . . . . . .
TEST CABLE
EXTENDER ASSEMBLY . . . . . . . . .
INTERCONNECTING ASSEMBLY
ADAPTER . . . . . . . . . . . . . . . . . . . . .
ADAPTER . . . . . . . . . . . . . . . . . . . .
BNC Tee. . . . . . . . . .
ADAPTER
CAPACITOR . . . . . . . . . . . . . . . . . . .
1.
HP
HP
HP
. .
. .
. .
8200
HP 8601A
HP 180A
HP 5245L
HP 8447A
HP 423A
HP 10501A
HP 10503A
11592-60001
11592-60015
11592-60016
HP 10110A
UG-201A/U
UG-274B/U
UG-349A/U
PF (approx.)
Connect the test setup as shown in Figure 5-12. Make the following control settings:
ANALYZER :
3 MHz Amplifier Assembly A2 removed.
8601A:
FREQUENCY . . . . . . . . .
RANGE . . . . . . . . . . . .
SWEEP
OUTPUT LEVEL . . . . . . . . . . . . . . .
SWEEP MODE . . . . . . . . .
1 kHz MODE . . . . . . . . . .
5-30
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. 50 MHz
. . . 110
. . SYM
. -10 dBm
LINE-FAST
. .
OFF
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-38. 50 MHz lF Bandpass Check and Adjustment (cont’d)
180A/1801A:
MAGNIFIER . . .
POSITION . . . .
VOLTS/DIV (Channel
POLARITY . . .
INPUT
DISPLAY
. . . . . . . . . . . . . . . . . . . . . . . .
.
.
A) . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . .
. . . . . . . . . . . . . . . . . . . . . . . .
.
(see- Figure 5-13)
. . . . . . . . . . 05
. . . . . .UP
5245L:
SAMPLE RATE
9 o’clock
SENSITIVITY (volts rms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.1
TIME BASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 ms
FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY
2.
Adjust Generator/Sweeper and oscilloscope to display a 10 MHz swept signal centered on 50 MHz.
(See Figure 5-13.)
3.
If the bandpass is not flat (±2 mV) at least 0.3 MHz on either side of 50 MHz, adjust A3A1C5, 6, 9 and
10 for maximum amplitude and flatness.
4.
Select 3 MHz sweep width on the HP 8601A and observe oscilloscope display for a bandpass as
shown in Figure 5-13. Repeat Step 3 as required to obtain desired bandpass.
5.
Remove power from display section and install 3 MHz Amplifier Assembly A2.
6.
Remove cable assembly from Generator/Sweeper.
7.
Perform 44 MHz Rejection Check, paragraph 5-39. If capacitors A3C11, 14 or 19 are adjusted,
repeat steps 1 through 4 above.
Figure 5-13. 50 MHz Bandpass Display for 10 MHz and 3 MHz Sweeps
5-31
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-38. 50 MHz lF Bandpass Check and Adjustment (cont’d)
8. Connect a test cable from CAL OUTPUT to
RF INPUT and make the following control
settings:
ANALYZER:
FREQUENCY . . , . . . . . 30 MHz
. Full cw
FINE TUNE
INPUT ATTENUATION . . . . . . . .dB
TUNING STABILIZER . . . . . . OFF
BANDWIDTH . . . . . . . . 10 kHz
PER DIVISION
SCAN WIDTH
SCAN WIDTH PER DIVISION
. 100 kHz
BASE LINE CLIPPER. . . . . . . . Max ccw
SCAN TIME PER DIVISION
. . . . . . . . . . . 2 MILLISECONDS
LINEAR SENSITIVITY
Set for full scale display
VIDEO FILTER. . . . . . . . . OFF
INT
SCAN MODE
SCAN TRIGGER . . . . . . . . . . . . . . . . LINE
LOG·LINEAR . . . . . . . . LINEAR
9.
Figure 5-14. 50 MHz Bandpass Flatness Display
Tune FREQUENCY for display indicated in Figure 5-14 when FINE TUNE is rotated in 100 kHz
steps.
10. Reduce LINEAR SENSITIVITY Vernier to a seven division vertical deflection. Rotate FINE TUNE
through its range while observing display for flatness. Display should be flat ±0.2 division across the
1.0 MHz FINE TUNE range.
-0.2
+0.2 div
5-39. 44 MHz Rejection Adjustment
REFERENCE: Schematic 3.
DESCRIPTION: A 50 MHz reference is established, then 44 MHz is fed into the 47 MHz converter and
nulled 70 dB below the reference level. The 50 MHz IF Bandpass Check and Adjustment must be
repeated after the 44 MHz rejected controls are adjusted.
5-32
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-39. 44 MHz Rejection Adjustment (cont'd)
Figure 5-15. 44 MHz Rejection Adjustment Test Setup
EQUIPMENT:
SIGNAL GENERATOR . . . . . .
TEST CABLE
INTERCONNECTING ASSEMBLY . . . . . .
EXTENDER ASSEMBLY . . . . . .
ADAPTER . . . . . . . . . . .
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. HP
. HP
. .
HP 608F
11592-60001
11592-60016
11592-60015
. UG-201A/U
1. Connect the test setup shown in Figure 5-15 and make the following control settings:
ANALYZER:
INPUT ATTENUATION . .
FINE TUNE . . . . . . . . . .
TUNING STABILIZER . . . .
BANDWIDTH . . . . .
SCAN WIDTH . . . . .
SCAN WIDTH PER DIVISION
BASE LINE CLIPPER . . .
SCAN TIME PER DIVISION
LOG REF LEVEL controls .
VIDEO FILTER . .
SCAN MODE . . . . . .
SCAN TRIGGER . . . .
LOG-LINEAR . . .
608F:
MODULATION . . .
ATTENUATION . .
. . . 0 dB
. . Centered
. . . . OFF
. . 10 kHz
PER DIVISION
. . . 20 kHz
. . . Max CCW
. MILLISECONDS
. . See text
. . .
OFF
. . .
INT
. . . LINE
. 10 dB LOG
. . . . CW
. . -20 dBm
5-33
TM
11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-39. 44 MHz Rejection Adjustment (cont’d)
608F control settings (cont’d)
MEGACYCLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..50
Press & peak meter reading
AMPL TRIMMER . . . . . . . . . . . . . . . . . . . . .
FREQUENCY RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C
2.
Adjust LOG REF LEVEL controls for a full-scale signal display. Use the signal generator frequency
control to center the display.
3.
Establish a reference by observing the position of the LOG REF LEVEL control with reference to
the lit indicator light.
4.
Tune the signal generator to 44 MHz and peak the AMPL TRIMMER. Use the LOG REF LEVEL
control to once more get an on-screen display, but without disturbing the vernier. If necessary, use
the signal generator frequency control to center the display.
5.
Increase the signal level on the display while keeping track of the number of LOG REF LEVEL
10-dB steps. Use LOG REF LEVEL vernier for the final small adjustment.
6.
Add up total attenuation. The level of the 44 MHz signal in step 5 should be at least 70 dB below
the level in step 2.
44 MHz Rejection: 70 dB
7.
If the rejection is not at least 70 dB, adjust the 44 MHz capacitors A3C11, 14, and 19 on the A3
50 MHz Converter assembly for minimum 44 MHz signal indication on the analyzer display.
8.
When the 44 MHz rejection adjustment is completed, repeat the check and adjustment procedure in
the 50 MHz IF Bandpass Check and Adjustment, paragraph 5-38.
5-40. 30 MHz Calibration Oscillator Check and Adjustment
REFERENCE: Schematic 18.
DESCRIPTION: The CAL OUTPUT at the front panel is measured and adjusted for 30 MHz at -30
dBm. The amplitude is measured on the analyzer CRT by comparing it to a calibrated signal. The
frequency is amplified and measured with a counter.
5-34
TM 11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-40. 30 MHz Calibration Oscillator Check and Adjustment (cont'd)
Figure 5-16. 30 MHz Calibration Amplitude Adjustment Setup
EQUIPMENT:
VECTOR VOLTMETER . . . .
CABLE ASSEMBLY (2) . . . .
EXTENDER ASSEMBLY
INTERCONNETING ASSEMBLY
50-OHM LOAD . . . . . . . .
50-OHM TEE . . . . . . . .
ADAPTER
SIGNAL GENERATOR . . . . . .
1. Connect the equipment shown in Figure 5-16 and make
ANALYZER:
FREQUENCY . . . . . . .
. . . . . . . .
BANDWIDTH . . . . . . . . . . .
. . . .
SCAN WIDTH
. . .
. . .
SCAN WIDTH PER DIVISION
. . . . . . .
TUNING STABILIZER . . .
. . . . . . . .
INPUT ATTENUATOR
. . . . . . . .
SCAN TIME PER DIVISION . . .
. . . . . . . .
. . . HP 8405A
. .
HP 10503A
HP 11592-60015
HP 11592-60016
. . .
HP 908A
. .
HP 11536A
. .
UG-201A/U
. . .
HP 606B
the following control settings:
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. . . 30 MHz
. . . 30 kHz
PER DIVISION
. . . 20 kHz
. . . . . On
. . . . . 10 dB
5 MILLISECONDS
5-35
TM 11-6625-2781-14-1
Adjustments
Model 8552B
ADJUSTMENTS
5-40. 30 MHz Calibration Oscillator Check and Adjustment (con’t.)
ANALYZER control settings (cont’d)
LOG-LINEAR
LINEAR SENSITIVITY . . . . . . .
SCAN MODE
SCAN TRIGGER . . . . . . . . . . .
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LINEAR
. 1 mV/DIV
INT
. . . . AUTO
8405A:
20–40
FREQUENCY RANGE – MHZ. . . . . . . . . . . . . . . . . . . . . . .
A
CHANNEL
AMPLITUDE RANGE - dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-30
606B:
RANGE . . . . . . . . . . . . . . .
FREQUENCY . . . . . . . . . . . . .
MODULATION . . . . . . . . . . .
ATTENUATOR . . . . . . . . . . . .
VERNIER . . . . . . . . . . . . . . .
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. . . . .
. . ..6
.30 MHz
. . CW
.30 dB
. 0 dB
2.
Set amplitude of signal generator (as read on vector voltmeter) to exactly -30 dBm with
ATTENUATOR VERNIER.
3.
Disconnect signal generator from vector voltmeter and connect to analyzer RF INPUT. Adjust
analyzer FINE TUNE control to center signal.
4.
Adjust signal with LINEAR SENSITIVITY vernier for a 7.0 division reference on CRT display.
5.
Disconnect signal generator from RF INPUT. Connect CAL OUTPUT to RF INPUT.
6.
Signal Amplitude should be 7.0 division ±0.2 divisions.
7.2 div
6.8
7.
If it is out of limits, peak signal with A6C15 and set signal level to 7.0 division with A6R54 CAL
LEVEL.
NOTE
A6 must not be operated on extender board for this adjustment.
8.
9.
Measure the Calibrator frequency (see paragraph 4-23). Frequency limits:
29.997
If frequency is out of limits, replace A6Y1 and repeat steps 1 through 8.
5-36
_30.003
MHz
TM
11-6625-2781-14-1
Model 8552B
Adjustments
ADJUSTMENTS
5-41. Analogic Check and Adjustment
REFERENCE: Schematic 17.
DESCRIPTION: The A5R75 THRESH control is adjusted so that under the conditions specified in this
test, the DISPLAY UNCAL light comes on. Check the remaining positions of the switches in the table
to verify operation of the DISPLAY UNCAL switch matrix.
1. Install the analyzer plug-ins on the two extender cable assemblies, and make the following control
settings:
ANALYZER:
VIDEO FILTER
OFF
SCAN TIME PER DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 MILLISECOND
SCAN WIDTH
PER DIVISION
SCAN WIDTH PER DIVIASION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 MHz
BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30kHz
2. With the controls set as in step 1 above, the DISPLAY UNCAL light should be on. If not, adjust
A5R75 THRESH control until the light just comes on.
3. Use Table 5-2 below to complete adjusting the THRESH control:
Table 5-2. Analogic Threshold Adjustment
SCAN TIME PER DIVISION BANDWIDTH SCAN WIDTH PER DIVISION DISPLAY UNCAL Light
1 ms
2 ms
10 s
10 s
30
30
1
1
kHz
kHz
kHz
kHz
1
1
10
5
MHz
MHz
MHz
MHz
On
Off
On
Off
5-37
TM 11-6625-2781-14-1
Adjustments
Model 8552B
CHECKS AND ADJUSTMENTS
541. Analogic Test and Adjustment (cont’d)
4.
Check operation of DISPLAY UNCAL light using Table 5-3. When the table indicates the DISPLAY
UNCAL light to be “off”, it is acceptable for light to be “on” if the light subsequently goes “off”
when either the SCAN TIME PER DIVISION or the SCAN WIDTH PER DIVISION control is
switched one position counterclockwise.
Table 5-3 Display Calibration Conditions
SCAN TIME PER DIVISION
1 ms
1 ms
1 ms
1 ms
5 ms
5 ms
20 ms
20 ms
0.1 s
0.1 s
0.5
0.5
2
2
10
5-38
s
s
s
s
s
BANDWIDTH SCAN WIDTH PER DIVISION
300
100
100
30
30
kHz
kHz
kHz
kHz
kHz
10 kHz
10 kHz
3 kHz
3 kHz
1 kHz
1 kHz
0.3 kHz
0.3 kHz
0.1 kHz
0.1 kHz
10
10
5
5
2
DISPLAY UNCAL Light
MHz
MHz
MHz
MHz
MHz
Off
On
Off
On
Off
2 MHz
1 MHz
1 MHz
0.5 MHz
0.5 MHz
On
Off
On
Off
On
0.2 MHz
0.2 MHz
0.1 MHz
0.1 MHz
.05 MHz
Off
On
Off
On
Off
.05 MHz
20 kHz
20 kHz
10 kHz
10 kHz
On
Off
On
Off
On
10 s
5 s
2 s
2 s
1 s
.05
0.1
0.1
0.1
0.1
kHz
kHz
kHz
kHz
kHz
1 s
0.5 s
0.5 s
0.2 s
0.2 s
0.1
0.1
0.1
0.1
0.1
kHz
kHz
kHz
kHz
kHz
5 kHz
5 kHz
2 kHz
2 kHz
1 kHz
Off
On
Off
On
Off
0.1 s
0.1 s
50 ms
50 ms
20 ms
0.1
0.1
0.1
0.1
0.1
kHz
kHz
kHz
kHz
kHz
1 kHz
0.5 kHz
0.5 kHz
0.2 kHz
0.2 kHz
On
Off
On
Off
On
TM
11-6625-2781-14-1
Model 8552B
Adjustments
Table 5-4. Factory Selected Components
Component
Service Sheet
Basis of Selection
A1R16
8
Adjusts 10 kHz Bandwidth amplitude: 750 to 1200 ohms.
A1R38
8
Adjusts 300 kHz Bandwidth amplitude: 10 to 50 ohms.
A3R3
3
Adjusts 47 MHz LO level: 1.5K to 2.15K ohms.
A3R9
3
Adjusts 50 MHz Converter Gain: 18 to 52 ohms (4 ohm/dB
change).
A4R125
11
Adjusts overall gain of 8552B for full deflection to Log Ref
graticule with –13 dBm input at J6 (LOG REF LEVEL at
–10 dBm): 200 to 700 ohms.
A6C13
15
Adjusts scan time at 0.2 to 10 sec/div: 0 to 15 microfarads.
A8R3
12
Optimizes 10 dB gain step: 1.47K to 2.37K.
A10R8
A10R9
11
Insures 10 dB/step attenuation: R8, 6.81K to 16.2K;
R9, 21.5K to 51.1K.
A4R25
A4R26
11
Adjusts crystal filter skirt width. If out of specifications,
change both resistors. Possible value ranges: R25, 19.6K
to 23.7K; R26, 42.2K to 51.1K.
A4R44
A4R45
11
Adjusts crystal filter skirt width. If out of specifications,
change both resistors. Possible value ranges: R44, 23.7K to
26.1K; R45, 51.1K to 56.2K.
A4R70
A4R71
11
Adjusts crystal filter skirt width. If out of specifications
change both resistors. Possible value ranges: R70, 23.7K to
26.1K; R71, 51.1K to 56.2K.
A4R81
A4R82
11
Adjusts crystal filter skirt width, If out of specifications
change both resistors. Possible value ranges: R81, 23.7K to
26.1K; R82, 51.1K to 56.2K.
A12R14
4
Adjusts search loop gain: 0 to 1K ohm.
5-39
TM 11-6625-2781-14-1
Model 8552B
Adjustments
Table 5-5. Check and Adjustment Test Record
Test Performed by
Date
Hewlett-Packard Model 8552
Spectrum Analyzer IF Section
Serial No___
Para.
No.
5-27
Test Description
Power Supply Checks and Adjustments
109.5 – 126.5 Line Voltage:
+20 Vdc supply
Ripple
-10 Vdc supply
Ripple
5-28
5-29
Horizontal Scan Checks & Adjustments
SCAN IN/OUT voltage:
Rise Time
Max
Actual
+19.90
+20.10
0.5
Vdc
mVp-p
9.99
5 0
ms
-10.01
0.02
58
5.02
Vdc
Scan Amplitude
Vdc
+
4.9
+ 5.1
4.98
-5
divisions
-
0.1
+ 0.1
-4
divisions
-
0.1
+ 0.1
-3
divisions
-
0.1
+ 0.1
-2
divisions
-
0.1
+ 0.1
-1
0
+1
divisions
-
0.1
+ 0.1
divisions
-
0.1
+ 0.1
divisions
divisions
-
0.1
0.1
+ 0.1
+ 0.1
divisions
-
0.1
+ 0.1
divisions
-
0.1
+ 0.1
Vp-p
2
20
Vp-p
8
Final Scan Checks
Scan Linearity Graticule:
+3
+4
SCAN TRIGGER . . . . EXT
EXT SCAN MODE: voltage
required for trace
VIDEO TRIGGER: voltage
required for trace
MANUAL SCAN
divisions
1.5
divisions
10
divisions
2
divisions
LOG REF
2
Vertical Deflection Amplifier Checks
VERTICAL POSITION control check
VERTICAL GAIN control check
2 dB LOG: at 0 dB
at -10 dB
BASE LINE CLIPPER Check: full CW
5-40
Vdc
mVrms
Min
SCAN TRIGGER . . . . EXT
+2
5-30
Measurement
Unit
-50 dB
divisions
2
+2
8
TM
11-6625-2781-14-1
Adjustments
Model 8552B
Table 5-5. Check and Adjustment Test Record (cont’d)
Para.
No.
5-31
Test Description
Actual
Max
Vdc
Input Level
at XA4-14
Output at
XA8-14
-100 dBm
<6 mVdc
+ 10 dBm
800 ±40
mVdc
-840
-760
0 dBm
- 10 dBm
700 ±40
mVdc
-740
-660
600 ±40
mVdc
-640
-560
- 20 dBm
500 ±40
mVdc
-540
-460
- 30 dBm
400 ±40
mVdc
-440
-360
- 40 dBm
300 ±40
mVdc
-340
-260
- 50 dBm
200 ±40
mVdc
-240
-160
- 60 dBm
100 ±40
mVdc
-140
- 60
240
360
-6
mVdc
300 kHz Bandpass Filter Adjustment
Bandwidth
5-33
Min
Log/Linear Amplifier Checks & Adjustments
VERTICAL OUTPUT voltage: 7.07 div
deflection
5-32
Measurement
Unit
kHz
LC Filter Adjustment
Gain Check:
300 kHz
100 kHz
30 kHz
10 kHz
3 kHz
Reference
±0.4 div
divisions
-0.4
+0.4
±0.4 div
±0.4 div
±0.4 div
divisions
divisions
-0.4
-0.4
+0.4
divisions
-0.4
+0.4
+0.4
Bandwidth Check:
5-34
100 kHz
kHz
80
120
30 kHz
kHz
24
10 kHz
kHz
9.5
36
10.5
divisions
6.7
7.3
divisions
6.7
7.3
0.3 kHz
divisions
6.7
7.3
0.1 kHz
divisions
divisions
divisions
6.7
7.3
6.5
6.0
7.5
7.0
Crystal Filter Fine Adjustment
Gain Check:
3 kHz : set for 7 div
1 kHz
0.03 kHz
0.01 kHz
5-41
TM 11-6625-2781-14-1
Adjustments
Model 8552B
Table 5-5. Check and Adjustment Test Record (cont’d)
Para.
No.
5-34
(cont)
Measurement
Unit
Min
3 kHz
divisions
1 kHz
0.3 kHz
divisions
4.8
4.0
divisions
divisions
4.8
4.0
6.0
7.2
6.0
.03 kHz
divisions
1.2
1.8
.01 kHz
divisions
0.4
0.6
Test Description
Actual
Max
Between 3 kHz and 300 kHz
Bandwidth Check:
0.1 kHz
60 dB/3 dB Bandwidth Ratio
3 kHz
7.2
Ratio
Ratio
Ratio
11:1
11:1
11:1
.03 kHz
Ratio
Ratio
11:1
11:1
.01 kHz
Ratio
11:1
1 kHz
0.3 kHz
0.1 kHz
5-35
Crystal Filter Come Adjustment
If necessary
5-36
3 MHz If Gain Log Adjustments
LOG REF LEVEL vernier: -0
-1
Vdc
-0.96
+1.04
Vdc
-0.96
+1.04
-2
Vdc
+1.04
-3
-4
Vdc
Vdc
Vdc
Vdc
-0.96
-0.96
-0.96
-0.96
-0.96
+1.04
-5
-6
-7
-8
Vdc
-0.96
+1.04
Vdc
-b.96
+1.04
-9
Vdc
-0.96
+1.04
-10
Vdc
Vdc
Vdc
-0.96
+1.04
+1.04
-11
-12
VERTICAL OUTPUT voltage:
7.07 div deflection
5-42
+1.04
+1.04
+1.04
Vdc
-0.96
-0.96
+1.04
TM 11-6625-2781-14-1
Model 8552B
Adjustments
Table 5-5. Check and Adjustment Test Record (cont’d)
Para.
No.
5-36
(cont)
Test Description
Measurement
Unit
Min
Actual
Max
Test Atten. LOG REF Error Limit
LEVEL
10 dB
-10 dBm
2 mVdc
mVdc
-2
+2
20 dB
-20 dBm
2 mVdc
- 2
+2
30 dB
40 dB
50 dB
-30 dBm
-40 dBm
-50 dBm
2 mVdc
2 mVdc
mVdc
mVdc
-2
- 2
+2
+2
- 2
+2
2 mVdc
mVdc
mVdc
Test Atten. LINEAR Error Limit
SENSIVITY
43 dB 0.1 mV/DIV
-15
-15
-15
+15
+15
mVdc
-15
+15
Level at A12TP2
mV p-p
450
Frequency at A12TP2
MHz
Level at C8
Level at J8
V p-p
V p-p
8.5
1.5
2.5
Level at A13TP1
mV p-p
650
1150
Frequency at A13TP1
kHz
1998
Frequency Linearity: Positive Offset
divisions
2002
0.75
0.75
±15 mVdc
±15 mvdc
47 MHz LO Automatic Phase
Lock Check and Adjustment
850
45.010
44.990
Negative Offset
divisions
No Offset
divisions
Vdc
0.75
0.75
0.76
+3.6
divisions
-0.2
11.5
0.75
+4.4
50 MHz IF Band pass Check & Adjustment
Flatness: ±0.2 vertical divisions over
2 horizontal divisions
+0.2
44 MHz Rejection Adjustment
44 MHz Rejection> 70 dB
5-40
+15
mVdc
±15 mVdc
APC Error at C8
5-39
-15
mVdc
mVdc
3 dB 10 mV/DIV
5-36
mVdc
+15
33 dB 0.2 mV/DIV
23 dB
1 mV/DIV
13 dB
2 mV/DIV
5-37
±15 mVdc
±15 mVdc
dB
70
30 MHz Calibration Oscillator Check
& Adjustment
Amplitude
divisions
6.8
Frequency
MHz
29.997
7.2
—
30.003
5-43
TM 11-6625-2781-14-1
Adjustments
Model 8552B
Tab le 5-5. Check and Adjustment Test Record (cont’d)
5-44
TM
11-6625-2781-14-1
Manual Changes
Model 8552B
SECTION Vll
MANUAL CHANGES
7-1. INTRODUCTION
form these changes in the sequence listed.
7-1. This section contains information for adapting
this manual to instruments for which the content
does not apply directly.
7-4. Refer to paragraph 7-6 for manual
changes pertaining to later serial numbered instruments.
7-3. To adapt this manual to your instrument, refer to Table 7-1 and make all of the manual changes
listed opposite your instrument serial number. Per-
NOTE
Changes M, N, and R in Table 7-1
below are deleted.
Table 7-1. Manual Changes by Serial Number
Serial Prefix or No.
1345A
1335A04961 to
1335 A04861 to
1311A
1250A
1234A02983 to
1217A
1210A
1209A
1144A01311 to
1144A01211 to
1137A
05360
04960
03210
01810
01310
Make Manual Changes
Serial Prefix or No.
A
A, B
A, B, C
A through D
A through E
A through F
A through G
A through H
A through I
A through J
A through K
A through L
1131A
1121A00811 to 00960
1121A00761 to 00810
1107A00561 to 00760
1107A00436 to 00560
1050A00386 to 00435
1050A00311 to 00385
977-00261 to 00310
977-00186 to 00260
977-00161 to 00185
974
971
Make Manual Changes
A through M
A through N
A through O
A through P
A through Q
A through R
A through S
A through T
A through U
A through V
A through W
A through X
7-1
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
Table 7-2. Summary of Changes by Component (1 of 2)
Changes
A
B
A1
L7
R4, R7, R12,
R21, R25, R26,
R30, R44, R45,
R70, R71, R81,
R82
A2
c
D
E
G
H
I
J
K
R60
Z1
A3
A3A2
R36
R55
R96
R112
A4
AS
A6
A7
A8
R122
C20
R18
RS7
Note
2
R98
A10
A11
A12
A13
W13
CHASSIS
PARTS
7-2
W13
TM
Model 8552B
11-6625-2781-14-1
Manual Changes
Table 7-2. Summary of Changes by Component (2 of 2)
NOTES
1. Extensive changes in A3 assembly. New parts list and schematic for instruments with serial prefix 974- and lower.
2. The instrument contains a new A7 board assembly. Section 7 of this manual contains the information contained
on Service Sheet 14 for instruments with aerial number prefixes 1217A and lower.
7-3
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
7-5. MANUAL CHANGE INSTRUCTIONS
CHANGE A
Page 8-27, Figure 8-19 (Service Sheet 4):
Delete L7 on lead from “+20” to “TO C10” on right-hand side of A12 assembly.
Page 8-21 (Service Sheet 4):
Add A12L7 between “+20 V” on A12 Assembly and C10 feedthrough capacitor.
CHANGE B
Page 8-35, Figure 6-29 (Semite Sheet 8):
Change A1R4, A1R12, A1R21, and A1R30 to 3.65K ohms.
Page 8-39,
Change
Change
Change
Change
Figure 8-32 (Semite Sheet 10):
A4R25* to A4R25 19.6K ohms.
A4R26* to A4R26 42.2K ohms.
A4R44
to A4R44 23.7K ohms.
A4R45
to A4R45 51.1K ohms.
Page 8-41,
Change
Change
Change
Change
Figure 8-34 (Service
A4R70
to A4R70
A4R71
to A4R71
A4R81
to A4R81
A4R82
to A4R82
Sheet 11):
23.7K ohms.
51.1K ohms.
23.7K ohms.
51.1K ohms.
CHANGE C
Page 8-31, Figure 8-25 (Service Sheet 6):
Delete shielding bead A2Z1 adjacent to A2C10.
Page 8-57, Figure 8-51 (Service Sheet 19):
Delete A5Z2 at base lead of A5Q23 (top left-hand side of schematic).
7-4
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE D
Page 8-57, Figure 8-50, (Service Sheet 19):
Change C20 to R18 on A5 Power Supply.
Page 8-57, Figure 8-51 (Service Sheet 19):
Delete A5C20 .01 µF (lower left-hand portion of schematic).
Add A5R18 511 ohms in place of A5C20 (from gate to cathode of A5CR10).
CHANGE E
Page 8-35, Figure 8-29 (Service Sheet 8):
Change the value of R60 to 147 ohms.
CHANGE F
Page 8-23, Table 8-5 (Service Sheet 2):
Delete under connector J3: Pin 22, Wire Color Code, 90; Function, Scan width Ground.
Page 8-29, Figure 8-23 (Service Sheet 5):
Change the diagram as shown in the partial schematic.
Figure 7-1. Power Supply Partial Schematic (Part of Change F)
7-5
TM 11-6625-2781-14-1
Manual Changes
Model 8552B
CHANGE G
Page 8-55, Figure 8-49 (Service Sheet 18):
Change Note 1 to: R57 is 1.1K ohms for Options H01/H02.
CHANGE H
Service Sheet 14 Component Locations:
Change to Figure 7-10.
Service Sheet 14 Schematic:
Change the figure as shown by Figure 7-11.
Service Sheet 14 Text:
Redate the text material with the information contained under the heading SERVICE
SHEET 14 TEXT.
SERVICE SHEET 14 TEXT (Part of Change H)
It is assumed that the video signal from the Log/
Lin assembly and dc supply voltages are present
and correct but that the vertical deflection output
signals are not correct.
TROUBLESHOOTING PROCEDURE
When trouble has been isolated to the Deflection
Amplifier assembly, the assembly should be
removed from the chassis and re-installed using an
extender board to provide easy access to components. Test procedures follow the technical discussions of individual circuits.
BLANKING AND BLANKING CONTROL
CIRCUITS
Operation of the blanking preamplifier Q12/Q21 is
controlled by the scan generator in the INT
(internal) mode of operation and by an external
source (via J2) in the EXT (external) mode. In the
SINGLE mode a -12.6V dc level is applied to the
trigger circuit in the scan generator to enable the
circuit for one scan only. In the MANUAL mode,
blanking is not used.
Q12/Q21 act as a switch to control the operation
of Q11. When Q11 is turned off the CRT is blanked. Blanking is also partially controlled by the
baseline clipper and clipper override circuits. See
step
TEST PROCEDURE
EQUIPMENT REQUIRED
SERVICE KIT. . . . . . . . . . . . HP 11592A
. HP 180A/1801A/1821A
OSCILLOSCOPE
DIGITAL VOLTMETER . . . HP 3440A/3443A
CONTROL SETTINGS
Unless otherwise specified in individual tests.
SCAN WIDTH PER DIVISION . . . . . . 2 MHz
LOG REF LEVEL . . . . . . . . . . . 30 dBm
VIDEO FILTER . . . . . . . . . . . . . .. OFF
SCAN TRIGGER . . . . . . . . . . . . . . . . . . . .LINE
INPUT ATTENUATION . . . . . . . . . . . . . . . 0 dB
LOG-LINEAR . . . . . . . . . . . . .10 dB LOG
SCAN MODE. . . . . . . .. . . . . . . . . . . . . . . . . .INT
SCAN TIME PER DIVISION . 1 MILLISECOND
CAL OUTPUT connected to
RF INPUT
FREQUENCY. . . . . . . . . . . . . . . . . . .30 MHz
7-6
Connect the HP 180A/1801A/1821A to TP A
(Q11-e) and observe the waveforms shown in A
and B below.
CONTROL SETTINGS :
(Waveform A)
Oscilloscope:
5V/Div
2 msec/Div
10:1 Probe
Analyzer:
BASE LINE
CLIPPER CCW
Waveform GOOD:
Proceed to waveform B.
Waveform BAD:
Check Q11/Q12/Q21
and associated components.
TM 11-6625-2781-14-1
Model 8552B
SERVICE SHEET 14 TEXT (cont’d)
(Part of Change H)
CONTROL SETTINGS:
(Waveform B)
oscilloscope:
Same as A.
Analyzer: Same as
above except rotate
BASE LINE CLIPPER
full cw.
If waveform A was
GOOD and B was
BAD, trouble
should be in the
baseline clipper
circuits.
If correct waveforms
were obtained,
blanking circuits and
baseline clipper circuit is functioning
properly. Proceed
to step
Manual Changes
operation of the clipper override circuit, connect
the HP 180A/1801A/1821A to TP B (Q20-c) and
observe the waveform.
CONTROL SETTINGS:
Oscilloscope:
0.1 V/Div
2 msec/Div
10:1 probe
Analyzer:
SCAN WIDTH:
preset SCAN
Rotate the BASE LINE CLIPPER control and
observe that marker signal remains regardless of
BASE LINE CLIPPER control position.
Waveform GOOD: Clipper override functions
properly.
Waveform BAD: Check Q20. (After verifying presence of marker input. )
2 dB LOG AND VERTICAL
PREAMPLIFIER CIRCUITS
BASELINE CLIPPER AND CLIPPER
CIRCUIT
Q3/Q13 operates as a comparator in which the
video signal is compared to a reference level established by the BASE LINE CLIPPER control and
the clipper override circuit.
When R10 is turned fully ccw and marker signals
are not present, Q13 conducts heavily and the dc
level at the junction of CR5/CR6 reaches approximately +14 V Olt S dc. Under these conditions Q3
cannot conduct and the display CRT is unblanked
except when blanking pulses are present.
When the BASE LINE CLIPPER control is turned
in a clockwise direction, Q13 conduction decreases, the dc level at the junction of CR5/CR6
decreases, and Q3 conducts when the negativegoing deflection pulses are more positive than the
established threshold. When Q3 conducts the CRT
display is blanked. When a marker signal appears,
Q20 inverts the marker and the dc level at the base
of Q13 rises. Q13 conduction increases and holds
Q3 off while the marker is present regardless of the
position of the BASE LINE CLIPPER control.
Q15, Q16 and associated circuitry comprise an
operational amplifier; when S1 (LOG-LINEAR
switch ) is in the 10 dB LOG position the amplifier’s gain is 1. When S1 is in the 2 dB LOG position, K1 is energized by Q25. This adds a feedback
divider and an offset to the amplifier to increase its
gain to 5 and re-reference the maximum signal
point to the CRT LOG REF graticule. Q24 is used
as a dual diode and prevents any signal on the CRT
display from going below the base line.
Q5, Q6, Q7 and associated circuitry comprise an
operational amplifier with a gain of approximately
10. VERTICAL GAIN control, R11, controls the
amplifier’s feedback and thus its gain.
TEST PROCEDURE
3a. With LOG-LINEAR in 10 dB LOG, switch
LOG REF LEVEL to -20 dBm to put the signal
peak at the -10 dB graticule on the CRT display.
Switch LOG-LINEAR to 2 dB LOG; signal should
drop approximately to the -50 dB graticule.
TEST PROCEDURE
Test GOOD: Proceed to 3b.
Test BAD: Check Q15, Q16, Q24, Q25 and associated circuitry.
Operation of the BASE LINE CLIPPER is verified
by the test procedure in step
To verify
3b. Connect HP 180A/1801A/1821A to TP C
(Q5-c) and observe the waveform.
7-7
TM
11-6625-2781-14-1
Model 8552B
Manual Changes
SERVICE SHEET 14 TEXT (cont’d)
(Part of Change H)
CONTROL SETTINGS
CONTROL SETTINGS
Oscilloscope:
0.1 V/Div
2 msec/Div
10:1 probe
Analyzer:
Same as basic except:
SCAN WIDTH . . . . . . . . . . . . 0–100 MHz
SCAN TIME PER DIVISION . 1 MILLISECOND
LOG REF LEVEL . . . . . . . . . . . .-10dBm
FREQUENCY . . . . . . . . . . . . . .50 MHz
Not e negative-going video and positive-going
marker pulses. Rotate vertical gain control to verify proper operation.
Waveform GOOD: Proceed to step
Waveform BAD: Check Q5, Q6, Q7 and associated
circuity.
NOTE
If repairs to the 2 dB LOG and vertical preamplifier circuits are required, the adjustments specified in paragraphs 5-30 of Section V should be performed.
VERTICAL DEFLECTION POWER AMPLIFIERS
The vertical deflection signals from the vertical preamplifier are dc coupled through VR1 and R34 to
output drive stage Q2. VR1 also provides a dc offset level for the vertical signals and Q1 provides a
temperature compensation for the voltage control
circuit. Q8 inverts the deflection signals to provide
negative-going signals at the Q8 collector to drive
one of the CRT deflection plates. Q8 also provides
a non-inverted signal which is emitter coupled to
Q18. Q18 does not invert the signal and it appears
at the collector of Q18 as a positive-going deflection signal. Thus the signals at the emitters and
bases of Q8 and Q18 are in phase and the collector
signals are 180 degrees out of phase to provide
push-pull deflection. VERTICAL POSITION control R15 controls the vertical position of the CRT
trace by controlling the dc level of the pedestal on
which the vertical deflection signals are applied to
the CRT deflection plates.
TEST PROCEDURE
Connect the HP 180A/1801A/1821A Channel A
probe to TP D (Q8-e) and the Channel B probe to
TP E (Q18-e), and observe the waveforms.
7-8
SCAN TIME PER DIVISION 0.5 MILLISECOND
LOG REF LEVEL . . . . . . . . . . . . . -10dBm
Waveform GOOD: Proceed to step
Waveform BAD: Check Q1, VR1, VR2, Q2, Q8,
Q9, Q10, Q18, Q19 and associated components.
HORIZONTAL
DEFLECTION
AMPLIFIER
Driver stage Q23 inverts the scan ramp and applies
it to the base of Q22. Q22 inverts the signal and
supplies the positive-going deflection signal. The
scan ramp is also emitter coupled to Q14 which
supplies the negative-going deflection signal. The
signals at the emitters and bases of Q14 and Q22
are in phase but the collector signals are 180
degrees out of phase and provide push-pull deflection signals to the horizontal deflection plates of
the CRT. Controls are provided to vary the width
and position of the CRT trace.
TEST PROCEDURE
Connect the HP 180A/1801A/1821A Channel A
input to TP G (Q22-c) and the Channel B input to
TP H (Q14-c) and observe the waveforms.
Waveform GOOD: Assembly functions properly.
If neither waveform is good, check Q1/Q2/Q8/Q10
and associated components.
If Channel A waveform is good and Channel B
waveform is bad, check Q9/Q18/Q19 and associated components.
NOTE
If repairs to the deflection amplifier
assembly are required, the Front Panel
Check Procedure, paragraph 4-12 of Section IV, should be performed.
Model 8552B
TM 11-6625-2781-14-1
Manual Changes
SERVICE SHEET 14 TEXT (cont’d)
(Part of Change H)
CONTROL SETTINGS
Oscilloscope:
2V/Div
5 msec/Div
10:1 probe
Waveform GOOD:
Unit functions
properly
Waveform A GOOD and B BAD check
Q4/Q14 and associated components.
Both waveforms BAD check Q23/Q22 and
associated components.
CHANGE I
Service Sheet 11 and 12 Schematics:
Change:
A4R36, R55, R96 and R112 to 7500 OHMS.
7-9
Pages 7-10 and 7-11 deleted
TM
11-6625-2781-14-1
Manual Changes
Mode18552B
Figure 7-2. Deflection Amplifier A7Component identification (Part of Change H)
7-12
Model 8552B
TM 11-6625-2781-14-1
Manual Changes
7-13
TM
11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE J
Service Sheet 13 Schematic:
Change the figure as shown in the partial schematics of Figures 7-4 and 7-5.
Figure 7-4. Log/Linear Amp!ifier Partial Schematic (Part of Change J)
Figure 7-5. Log/Linear Amplifier Partial Schematic (Part of Change J)
7-14
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE K
Service Sheet 11 Schematic:
Change the value of A4R122 to 511.
CHANGE L
Semite Sheet 14:
Change the value of A7R7 to 680 and A7C4 to 0.22.
CHANGE M
Deleted.
CHANGE N
Deleted.
CHANGE O
Service Sheet 14 Component Locations:
Change the figure to the one shown in Figure 7-5.
Service Sheet 14 Schematic:
change:
The HP Part number for the Deflection Amplifier Assy A7 (upper left-hand comer of the schematic)
to 08552-60108.
A7Q2 and Q9 HP part numbers to 1853-0050 of Figures 7-6 and 7-7.
The diagram as shown in the partial schematics.
7-15
TM 11-6625-2781-14-1
Manual Changes
Model 8552B
Figure 7-6. Deflection Amplifier A7 Component Identification (Part of Change O)
7-16
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
Figure 7-7. Deflection Amplifier Partial Schematic (Part of Change O)
Figure 7-8. Deflection Amplifier Partial Schematic (Part of Change O)
7-17
TM
11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE P
Service Sheet 19 Schematic:
Delete A5Z1.
Semite Sheet 10 Schematic:
Delete A4CR48 and CR49.
CHANGE Q
Table 1-1:
Change the AMPLITUDE SPECIFICATIONS:
Amplitude Accuracy:
Switching between bandwidths (at 20°C)
0.03 – 300 kHz
0.01 – 300 kHz
LOG
±0.05 dB
±1.0dB
LINEAR
±5.8%
± 19.0%
CHANGE R
Delated.
CHANGE S
Service Sheet 13 Schematic:
Change: R13 value to 147.
Delete: A10R10 and show the –12.6 Vdc supply voltage connected directly to the switch contact.
CHANGE T
Service Sheet 14:
Change: A7Q10 and Q19 to 1864-0232.
Service Sheet 17:
Change: A11R1 to 34.8K.
7-18
TM
11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE U
Service Sheet 13 Schematic:
Change the diagram as shown in the partial Schematics, Figure 7-9 and 7-10.
Figure 7-9. Log/Linear Amplifier Partial Schematic (Part of Change U)
Figure 7-10. Log/Linear Amplifier Partial Schematic (Part of Change U)
7-19
TM
11-6625-2781-14-1
Manual Changes
CHANGE V
Service Sheet 4 Schematic:
Change: A12U1 HP Part number to 1820-0216.
Service Sheet 5 Schematic:
Change: A5U1 and U2 HP part numbers to 1820-0216.
Service Sheet 11 Schematic:
Change the value of
A4R115 to 147.
A4R122 to 1000.
Service Sheet 14 Schematic:
change:
The value of A7R23 to 909.
A7R24 to 100 ohm potentiometer.
Service Sheet 15 Schematic:
Change:
The value of A6C13 to 12.
A6U1 and U2 HP part numbers to 1820-0216.
7-20
Model 8552B
TM
Model 8552B
11-6625-2781-14-1
Manual Changes
CHANGE W
Service Sheet 3 Schematic:
Change the value of:
A3A2C15 to 39
A3A2R3 to 2150
A3A2R7 to 147
A3A2R8 to 61.9
A3A2R13 to 21.5
A3A2R14 to 90.9.
Service Sheet 4 Schematic:
Change the value of A4R10 to 2.15K.
Service Sheet 8 Schematic:
Change the value of A1R38 to 51.1.
Service Sheet 10 Schematic:
Change the value of:
A4R44 to 19.6K
A4R45 to 42.2K.
Service Sheet 11 Schematic:
Change the value of:
A4R70 and A4R81 to 19.6K
A4R71 and A4R82 to 42.2K
A4R102 to 12.1K
A4R115 to 51.1
A4R122 to 511
A4R126 and R128 to 1K
A4R132 to 10K.
CHANGE X
Service Sheet 3 Schematic Diagram:
Change the schematic to the one shown in Figure 7-11.
Service Sheet 4 Schematic Diagram:
Change the value of:
A12L4 and A12L5 to 8.2.
A12R14 to a 1000 ohm variable resistor.
A12R16 to 26.1
A13L2 to 33.0
Delete: A12L2.
7-21
Pages 7-22 and 7-23 deleted
TM
11-6625-2781-14-1
Manual Chages
7-24
Model 8552B
fig. 7-11
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
CHANGE Y
Service Sheet 5 Schematic Diagram:
Change the Schematic as shown in Figure 7-12.
Figure 7-12. Power Supply Partial Schematic Diagram (Part of Change Y)
7-25
TM 11-6625-2781-14-1
Model 8552B
Manual Changes
7-6. The manual changes given below are for correcting errors and for adapting
the manual to instruments containing improvements made after the printing of the
manual. Make all ERRATA corrections first l nd then make all appropriate serial
number related changes indicated in the table.
Serial Prefix or Number
1431A
1
1437A thru 1437A07660,
1505A thru 1505A prefix,
1613A
1,2
1616A
1,2,3
1650A
1,2,3,4
ERRATA
Page 8-27, Figure 8-19, SERVICE SHEET 4:
Change C10 (far left) to C11.
Page 8-31, Figure 8-25, SERVICE SHEET 6:
Delete pF from value of L12.
CHANGE 1
Page 8-41, Figure 8-34, SERVICE SHEET 11:
Change R122 to R122*.
Page 8-49, Figure 8-43, SERVICE SHEET 15:
Change A6R29 to 1.96K.
Change A6R39 to 19.6K.
CHANGE 2
Page 8-39, Figure 8-32, SERVICE SHEET 10:
Change A4R33 to A4R33* 1.33K.
Change A4R52 to A4R52* 1.33K.
Change A4R66 to A4R66* 1.33K.
Change A4R36† to A4R36†* 6.19K.
Change A4R55† to A4R55†* 6.19K.
Change A4R68† to A4R68†* 6.19K.
7-26
Make Manual Changes
TM
Model 8552B
11-6625-2781-14-1
Manual Changes
CHANGE 2 (Cont’d)
Page 8-41, Figure 8-34, SERVICE SHEET 11.
Change A4R92 to A4R92* 1.33K.
Change A4R96† to A4R96†* 6.19K.
Change A4R108 to A4R108* 1.33K.
Change A4R112† to A4R112†* 6.19K.
CHANGE 3
Page 8-45, Figure 8-39, SERVICE SHEET 13:
Add A8R99 2.15K, on A8 LOG AMPLIFIER ASSY, between XA8 pin 8 and XA8 pin 9. Connection XA8 pin 9 is on
SERVICE SHEET 12.
CHANGE 4
Page 1-6, Table 1-2:
Change Tuning Tool. Slot, Nonmettalic, 2.5-inch shaft HP Part Number to 8710-0772.
Page 5-14, Paragraph 5.32:
Under EQUIPMENT, change TUNING TOOL HP Part Number to 8710-0772.
Page 5-15, Paragraph 5-33:
Under EQUIPMENT, change TUNING TOOL HP Part Number to 8710-0772.
7-27
TM
11-6625-2781-14-1
Model 8552B
Service
SECTION
VIII
SERVICE
8-1. INTRODUCTION
8-2. This section provides instructions for troubleshooting and repair of the HP 8552B Spectrum
Analyzer IF Section.
8-3, LINE VOLTAGE REQUIREMENTS
8-4. During adjustment and testing, the Spectrum
Analyzer must be installed with an RF Section into
a 140 Series Display Section which is connected to
a source of power which is 50 to 60 Hz and 115 or
230 Vac ±10%. If adjustment of the dc voltage
regulators is necessary, the Spectrum Analyzer
should be connected to the ac power source
through a variable auto transformer and then be
adjusted to check regulator action when the line
voltage varies as much as 10%.
“Some of the maintenance and servicing
operations described herein are performed
with power supplied to the instrument
while protective covers are removed, Be
careful when performing these operations.
Line voltage is always present on terminals including the power input connec-
tor, fuse holder, power switch, etc. In
addition, when the instrument is on, energy available at many points may result in
personal injury or death when contacted.”
8-5. MAINTENANCE AIDS
8-6. Servicing aids provided on circuit boards include holes to fit the board removal tool, numbered test points (on some boards), transistor
designators, adjustment callouts, and assembly
stock numbers.
8-7. TEST EQUIPMENT AND ACCESSORIES
REQUIRED
8-8. Test equipment and accessory requirements
are listed in the Maintenance Allocation
Chart in the appendix.
Test instruments other than those listed may be
used if their performance equals or exceeds that of
the equipment listed (refer to Table 1-2).
8-9. Two circuit board extenders are required to
service the 8552B IF Section. A 15-pin extender is
supplied with the HP 11592A Service Kit. It may
be used to extend the A1 through A8 Assemblies.
In addition, a 6-pin extender (HP 5060-5914) is
required to extend the A13 Assembly.
Figure 8-1. 8552B IF Section with Circuit Board Extended for Maintenance
8-1
TM
11-6625-2781-14-1
Model 8552B
Service
8-10. ADJUSTMENTS
8-11. The procedures .contained in these sections
do not include calibration or adjustment. Service
Sheets which contain adjustable components refer
to procedures in the Performance and Adjustment
Sections which should be performed after repairs
are accomplished.
8-12. GENERAL PROCEDURES
8-13. The troubleshooting procedure is divided
into two maintenance levels. The first, System Test
and Troubleshooting Procedure, is designed to
quickly isolate the cause of a malfunction to a circuit or assembly. The second provides circuit analysis and test procedures to aid in isolating faults to
a defective component. Circuit descriptions and
test procedures for the second maintenance level
are located on the page facing the schematic
diagram of the circuit to be repaired.
8-14. After the cause of a malfunction has been
located and remedied in any circuit containing
adjustable components, the applicable procedure
specified in the Performance and Adjustment Section should be performed.
8-15. GENERAL SERVICE INFORMATION
8-16. Part Location Aids. The locations of chassismounted parts and major assemblies are shown in
Figure 8-8, The locations of individual components
mounted on printed circuit boards or other assemblies are shown on the appropriate schematic diagram page or on the page opposite it. The part
reference designator is the assembly designator plus
the part designator. (Example: A10R9 is R9 on the
Log Reference Assembly A10). For specific component description and ordering information refer to
TM 11-6625-2781-24P-1.
8-17. Factory Selected Components. Some component values are selected at the time of final
checkout at the factory (see Table 5-4). Usually
these values are not extremely critical; they are
selected to provide optimum compatibility with
associated components. These components are
identified on individual schematics by an asterisk.
The recommended procedure for replacing a
factory-selected part is as follows:
a. Try the original value, then perform the
calibration test specified for the circuit in the performance and adjustment sections of this manual.
b. If calibration cannot be accomplished, try
the typical value shown in the parts list and repeat
the test.
c. If calibration still cannot be accomplished, perform the calibration test using various
values until calibration is accomplished.
8-2
8-18. Modular Exchange Program. Circuit boards
for the 8552B Spectrum Analyzer IF Section are
available on an exchange basis at a considerable
savings in cost, Simply contact the HewlettPackard office nearest you and make your requirements known. The local Hewlett-Packard office
will arrange for immediate airmail shipment to
minimize equipment downtime. At least 90% of
the orders for exchange modules (circuit boards)
received by an HP Field Sales office will be shipped
the same day — either from the sales office itself or
from service center.
8-19. An exchange module should be ordered by
the “Exchange Assembly” part number listed
under the assembly designation.
Upon receiving the exchange
module, the faulty module should be returned in
the same special carton in which the exchange
module was received, A flow diagram of the Modular Exchange Program is shown in Figure 8-2.
8-20, System Test and Troubleshooting Procedure.
Table 8-2 provides information that will, in most
cases, isolate the causes of a malfunction to a circuit or assembly, RF Section, or Display Section.
This procedure should be used in conjunction with
the block diagrams and text located on Service
Sheet 1. The test equipment required follows:
RF Voltmeter . . . . . . . . . . . .HP 3406A
Oscilloscope . . . . . . HP 180A/1801A/1821A
Signal Generator . . . . . . . . . . . HP 608F
Service Kit . . . . . . . . . . . .HP 11592A
A/U
Adapter . . . . . . . . . . . . UG-201
Cable Assembly . . . . . . . . . . HP 10503A
8-21. No attempt is made in this procedure to isolate causes of trouble to the component level.
Reference is made to the specific Service Sheet
which describes the circuits and test procedures for
the portion of the analyzer to which the malfunction has been isolated. Where RF or Display Section maintenance is indicated, refer to the RF or
Display Section Operating and Service manual.
8-22. Diagram Notes. Table 8-3, Schematic Diagram Notes, provides information relative to symbols and measurement units shown in schematic
diagrams.
8-23. ETCHED CIRCUITS
8-24. The etched circuit boards in the 8552B are
of the plated-through type consisting of metallic
conductors bonded to both sides of insulating
material. The metallic conductors are extended
through the component mounting holes by a plating process. Soldering can be done from either side
of the board with equally good results. Table 8-1
lists recommendations and precautions pertinent to
TM
11-6625-2781-14-1
Model 8552B
Service
The module exchange program described here is a fast, efficient, economical
method of keeping your Hewlett-Packard instrument in service.
Figure 8-2. Diagram of Modular Exchange Program
8-3
TM
11-6625-2781-14-1
Model 8552B
Service
etched circuit repair work.
a. Avoid unnecessary component substitution; it can result in damage to the circuit
board and/or adjacent components.
b. Do not use a high-power soldering iron on
etched circuit boards. Excessive heat may lift a
conductor or damage the board.
c. Use a suction device (Table 8-1) or
wooden toothpick to remove solder from component mounting holes. DO NOT USE A SHARP
METAL OBJECT SUCH AS AN AWL OR TWIST
DRILL FOR THIS PURPOSE. SHARP OBJECTS
MAY DAMAGE THE PLATED-THROUGH CONDUCTOR.
d. After soldering, remove excess flux from
the soldered areas and apply a protective coating to
prevent contamination and corrosion. See Table
8-1 for recommendations.
S-25. Etched Conductor Repair, A broken or
burned section of conductor can be repaired by
bridging the damaged section with a length of tinned copper wire. Allow adequate overlap and remove any varnish from etched conductor before
soldering wire into place.
8-26. COMPONENT REPLACEMENT.
a.
Remove defective component from board.
NOTE
Axial lead components, such as resistors
and tubular capacitors, can be replaced
without unsoldering, Clip leads near body
of defective component, remove component and straighten leads left in board,
Wrap leads of replacement component
one turn around original leads. Solder
wrapped connection, and clip off excess
lead.
Table 8-1. Etched Circuit Soldcring Equipment
8-4
TM 11-6625-2781-14-1
Service
Model 8552B
If component was unsoldered, remove
b.
solder from mounting holes. and position component as original was positioned.
DO NOT
FORCE LEADS INTO MOUNTING HOLES; sharp
lead ends may damage plated-through conductor,
8-27. Transistor Replacement
8-28. Solid state transistors are in many physical
forms. This sometimes results in confusion as to
which lead is the collector, which is the emitter,
and which is the base. Figures 8-3 and 8-4 show
epoxy and metal case transistors and integrated circuits and the means of identifying the leads.
8-29. To replace a transistor, proceed as follows:
a. Do not apply excessive heat; see Table 8-1
for recommended soldering tools.
b. Use long-nose pliers between transistor
and hot soldering iron as a heat sink, The instant
solder is melted, use pliers to pull lead free of
board .
c. When installing replacement transistor,
ensure sufficient lead length to dissipate soldering
heat by using about the same length of exposed
lead as used for original transistor.
d. Integrated circuit replacement instructions are the same as those for transistors.
8-30. Some transistors are mounted for good heat
dissipation. This requires good thermal contact
with mounting surfaces, To assure good thermal
contact for a replacement transistor, coat both
sides of the black insulator with Dow Corning No.
6 silicone compound or equivalent before fastening
the transistor to the chassis, Dow Corning No. 5
compound is available in 8-oz. tubes from Hewlett.
Packard; order HP Part No. 8500-0059.
Figure 8-3. Examples of Diode and Transistor Marking Methods
8-5
TM 11-6625-2781-14-1
Model 8552B
Service
8-31. Diode Replacement
8-32. Solid state diodes are in many physical
forms. This sometimes results in confusion as to
which lead or connection is for the cathode (negative) or anode (positive), since not all diodes are
marked with the standard symbols. Figure 8-3
shows examples of some diode marking methods.
If doubt exists as to polarity, an ohmmeter may be
used to determine the proper connection. It is
necessary to know the polarity of the ohms lead
with respect to the common lead for the ohmmeter
used. (For the HP Model 410B Vacuum Tube Voltmeter, the ohms lead is negative with respect to the
common; for the HP Model 412A DC Vacuum
Tube Voltmeter, the ohms lead is positive with
respect to the common.) When the ohmmeter
indicates the least diode resistance, the cathode of
the diode is connected to the ohmmeter lead which
is negative with respect to the other lead.
NOTE
Replacement instructions are the same as
those listed for transistor replacement.
8-33. SWITCHING INFORMATION
8-34. The manner in which switch wafers are schematically presented in this manual is distinctly dif-
ferent from that used in previous Hewlett-Packard
manuals. If the following information concerning
the evolution of this system of switch presentation
is carefully studied, it will be seen that circuits are
more easily understood and much more easily
traced.
8-35. One of the major objections to drawing
switch wafer symbols as the wafer appears is that
many lines must cross other lines on the schematics. This problem has not been completely
eliminated by use of straight-line presentation, but
it has been minimized and circuits are much easier
to follow once the basic principles are understood.
8-36. Figure 8-5 illustrates the evolution of
straight-line switch presentation from the pictorial
view of a switch wafer. Part A shows the wafer as it
actually appears. In parts B and C, when the wafer
is viewed as being a flexible, stretchable material,
the transition from wafer to straight-line presentation begins to be obvious. In part D the transition
is complete and the wafer now appears to be a slide
type switch. In part E the final result is shown.
Note that those contacts which maintain contact
with, the metallic portion of the rotor regardless of
switch position (in the illustration contact 7) are
moved to the other side for clarification. Note too
that lead lines and arrows to switch contacts are no
longer required.
Figure 8-4. Integrated Circuit Packaging
8-6
TM 11-6625-2781-14-1
Model
8552B
Service
8-37. In all schematics in this manual, the switches
are shown in the maximum ccw position, unless
otherwise noted. The physical layout of the switches
are shown as well as a straight-line presentation of
switch action. In Figure 8-6 note that the straight
line rotor contact moves from the bottom to the top
when the switch moves one step in a cw direction,
Figure 8-7 illustrates the difference between the old
method of switch presentation and the straight line
presentation.
Figure 8-5. Evolution of Straight-Line Switch Presentation
Figure 8-6. Three Positions of Typical Switch Wafers
8-7
TM
11-6625-2781-14-1
Model 8552B
Service
Figure 8-7. Wafer Switch Presentation Versus Straight-Line Presentation
8 - 8
TM
11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure
TEST
FAULT
PROCEDURE
1.
Set POWER switch to ON.
Power lamp on, fan operates.
Proceed to test 2.
Light not on
and/or fan
inoperative
Check Display Section
2.
Rotate INPUT ATTENUATION control and observe
LOG REF LEVEL index
lights.
None of
the lights
illuminate
Check the -12.6 volt supply from Display
Section, If voltage is present see Service
Sheet 18. If voltage is not present, check
the Display Section power supply.
Some but
not all lights
illuminate
Check light bulbs on Service Sheet 18.
SCANNING
light does not
illuminate
Check power supply circuits on Service
Sheet 19.
Trace does
not appear
Connect the oscilloscope to the SCAN IN/
OUT jack on the front panel of the
analyzer and observe the waveform.
Lights operate properly.
Proceed to test 3.
3.
Set Analyzer controls as follows:
SCAN TIME PER DIVISION . 5 ms
SCAN MODE. . . . . . . . . . . INT
SCAN TRIGGER . . . . . . AUTO
and observe SCANNING light.
If the power supply circuits are operating
properly, proceed to test 4.
Light operates normally.
Proceed to test 4,
4.
Adjust Display Section for
a baseline trace.
Oscilloscope control settings:
0.2 V/Div
10 msec/Div
10:1 probe
Baseline trace is normal,
Proceed to test 5
If the waveform is not present, check the
scan amplifier and the scan generator
(Service Sheets 15 and 16). If the waveform is present, check the horizontal
deflection amplifier, Service Sheet 14.
If trouble persists, check Display
Section.
8-9
TM 11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
TEST
FAULT
PROCEDURE
Connect the RF voltmeter to CAL OUTPUT jack. The voltmeter should indicate
approximately -30 dBm. If the signal is
not present refer to Service Sheet 17.
Repair the calibration oscillator and
repeat the test. If CAL OUTPUT is present proceed to test 6.
5. Set analyzer controls as follows:
FREQUENCY . . . . . . . . . ..30 MHz
BANDWIDTH . . . . . . . . . . . 10 kHz
FINE TUNE . . . . . . . . . . .. Centered
SCAN WIDTH . . . . . PER DIVISION
SCAN WIDTH PER DIVISION 1 MHz
INPUT ATTENUATION . . . . 10 dB
TUNING STABILIZER . . . . . . . . On
BASE LINE CLIPPER . . . . . . . . ccw
LOG REF LEVEL . . . . . . . . 0 dBm
LOG REF LEVEL Vernier . . . . . ccw
LOG-LINEAR . . . . . . . . 10 dB LOG
VIDEO FILTER . . . . . . . . . . . . OFF
SCAN TIME PER
DIVISION . . . . 2 MILLISECONDS
Connect CAL OUTPUT to RF INPUT
and observe display. The 30 MHz
signal should appear close to the
center of the display CRT at a level of
-30 dBm. If signal is correct, proceed
to test 8.
Signal does not
appear on Display Section
CRT
6. Set analyzer controls as follows:
BANDWIDTH . . . . . . . 10 kHz
FINE TUNE . . . . . . . Centered
SCAN WIDTH . . . PER DIVISION
SCAN WIDTH PER DIVISION 20 kHz
INPUT ATTENUATION . . . 0 dB
TUNING STABILIZER . . . OFF
BASELINE CLIPPER . . . . ccw
LOG REF LEVEL . . . . -30 dBm
LOG REF LEVEL Vernier
LOG-LINEAR . . . . . 10dB LOG
VIDEO FILTER . . . , . . . OFF
SCAN TIME PER DIVISION
. . . . . . . . 2 MILLISECONDS
If signal is
correct
IF Section operating correctly. Trouble
in RF Section. See Systems Test and
Troubleshooting Procedure in RF Section Manual.
Connect a 50 MHz -33 dBm signal
from the signal generator to J6 on the
top of the 8552B using the
11592-60001 cable. Tune the signal
generator slightly around 50 MHz until the signal is centered. With AMPL
CAL centered the signal should read
-30 dBm ±2 dBm.
Signal is
missing
Proceed to test 7
Signal appears
Refer to Service Sheet 4 and check the
but sweeps back 47 MHz APC and the 2 MHz VTO cirand forth about cuits.
±1 Div on CRT.
NOTE
For steps 7a through 7g connect CAL OUTPUT to RF INPUT and set the analyzer
controls as specified in step 6.
8-10
TM
11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
TEST
FAULT
PROCEDURE
7. Perform the following sub-tests
until a malfunction has been
found and corrected, then repeat
test.
7a. Connect the RF voltmeter to terminal labeled 3 MHz (C4) on the
top of the 8552B. Tune frequency
for maximum signal around 30
MHz. Signal should be about 8
mV rms. If signal is correct, proceed to test 7b.
Signal is missing or
incorrect
Refer to Service Sheet 3 and repair the
50 MHz Converter.
7b. Connect the RF voltmeter to the
3 MHz terminal (C4), peak FREQUENCY, then set SCAN TIME
PER DIVISION to 1 SECOND.
Meter should fluctuate with peaks
at about 8 mV rms. If signal is correct set SCAN TIME PER DIVISION to 2 MILLISECONDS
and proceed to test 7c.
Meter does not
fluctuate
Refer to Service Sheet 4 and check the
47 MHz APC and the 2 MHz VTO circuits. If trouble persists, check the 2
MHz Shaping circuits (Service Sheet 5).
7c. Set SCAN WIDTH to ZERO, connect the RF voltmeter to XA2
pin 14 and tune FREQUENCY for
maximum. Signal level should be
about 38 mV rms. Rotate AMPL
CAL and LOG REF vernier C W;
signal should increase. If signal is
correct, re-center AMPL CAL, set
vernier ccw and proceed to test
7d.
Signal is
missing or
incorrect
Refer to Service Sheets 6 and 7 and repair the 3 MHz Amplifier.
7d. Connect the RF voltmeter to
XA1 pin 2 and tune FREQUENCY and FINE TUNE for
maximum. Signal level should be
about 230 mV rms. If signal is correct, proceed to test 7e.
Signal is
missing or
incorrect
Refer to Service Sheet 8 and repair the
LC Filter.
7e. Connect the RF voltmeter to
XA4 pin 14 and tune FREQUENCY and FINE TUNE for
maximum. Signal should be about
930 mV rms. Set BANDWIDTH to
3 kHz and peak signal with FINE
TUNE. Signal should remain
about the same. If signal is correct, proceed to teat 7f.
Signal is
missing or
incorrect
Refer to Service Sheets 10 and 11 and
repair the Crystal Filter.
8-11
TM 11-6625-2781-14-1
Service
Model 8552B
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
TEST
FAULT
PROCEDURE
7f. Set SCAN WIDTH to PER DIVISION and connect oscilloscope
channel A probe to SCAN IN/
OUT jack and the channel B probe
to XA7, pin B. Oscilloscope control settings:
Time/Div . . .0.5 msec/div
Channel A . . . . . . 0.5 V/div
Channel B . . . . . . .02 V/div
10:1 probes
If waveform is correct, proceed to
test 7g.
Waveform B is
missing or
incorrect
Refer to Service Sheet 12 and 13 and
repair the Log • Linear Amplifier
circuits.
7g. Connect the oscilloscope channel
A input to XA7 pin 6 and the
channel B input to XA7 pin E
with analyzer set as in 7f.
Either waveform is missing
or incorrect
Refer to Service Sheet 14 and repair
the vertical deflection circuit.
Oscilloscope control settings:
VOLTS/DIV . . . . . . . . . . 2V/Div
TIME/DIV . . . . . . . . 2 msec/Div
10:1 probes
If waveform is correct, trouble is
in the Display Section or in interconnecting wiring. After making
repairs, repeat test 5.
8. Set analyzer controls as follows:
FREQUENCY . . . . . . . . . . 40 MHz
FINE TUNE . . . . . . . . . . . Centered
BANDWIDTH . . . . . . . . . . 300 kHz
SCAN WIDTH . . . . . ...0-100 MHz
SCAN WIDTH
PER DIVISION . . . . ...10 MHz
INPUT ATTENUATION . . . . 10 dB
RANGE – MHz . . . . . . . . . . 0-110
TUNING STABILIZER . . . . . . . On
BASE LINE CLIPPER . . . . . . . ccw
SCAN TIME PER
DIVISION . . 2 MILLISECONDS
LOG REF LEVEL . . . . . . . -10 dBm
LOG REF LEVEL Vernier . . . . . . . 0
LOG-LINEAR . . . . . . 10 dB LOG
VIDEO FILTER . . . . . . . . . . . . OFF
SCAN MODE . . . . . . . . . . . . . . INT
SCAN TRIGGER . . . . . . . . . AUTO
Connect CAL OUTPUT to RF INPUT using a BNC to BNC cable.
The display should be similar to
that shown in the procedure
column.
8-12
Sweep does not
extend to full
width of
graticule
Not all signals
present or
properly
spaced
30 MHz Calibrator Signal & Harmonics
See Service Sheet 14. Check Scan
Generator assembly.
Same as above. Also refer to System
Test and Troubleshooting Procedure
in RF Section Manual,
TM
11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
TEST
FAULT
PROCEDURE
Test 8 (cont'd)
Vary VERTICAL position to center baseline trace on bottom CRT
graticule. Signal amplitude is
unimportant in this test. Proceed
to test 9.
Baseline trace
does not vary
See Service Sheet 14,
Check vertical deflection circuit
9. Set LOG REF LEVEL maximum
ccw. Set SCAN TIME PER DIVISION to 10 SECONDS and adjust focus and astigmatism. Adjust
trace align to center trace on bottom CRT graticule. Proceed to
test 10.
Focus and
astigmatism
inoperative
or trace will
not align
Refer to Display Section Manual and repair as required.
10. Turn FREQUENCY control and
observe marker. Marker should
move as FREQUENCY is tuned.
Proceed to test 11.
Marker is
missing
See System Test and Troubleshooting
Procedure in RF Section Manual.
11. Tune FREQUENCY control to
move the marker exactly under
the signal three divisions from the
left. The signal will null when the
marker is tuned to the exact frequency of the signal. Set SCAN
WIDTH PER DIVISION control
to 0.05 MHz, BANDWIDTH to 10
kHz, and SCAN WIDTH to PER
DIVISION. 30 MHz signal should
appear close to the center graticule on the CRT. If correct signal
is observed, proceed to test 12.
30 MHz sig
nal does not
appear on
CRT
Check calibration and alignment of the
analyzer.
12. Adjust FREQUENCY to center
the 30 MHz signal on CRT, then
reduce SCAN WIDTH PER DIVISION to 10 kHz and recenter
the display with FINE TUNE control. Signal centers properly. Proteed to test 13.
Signal is
unstable,
Refer to System Test and Troubleshooting Procedure in RF Section manual,
FINE TUNE
does not vary
signal
position
See Service Sheet 5. Check 2 MHz VTO
Shaping Circuit,
Each of the
first 4 steps:
no increase in
gain, not 10
dB gain or
loss of signal,
See Service Sheet 11.
13. Turn LOG REF LEVEL fully CCW.
Top of signal should be -70 dB
graticule. R o t a t e L O G R E F
LEVEL seven steps CW . CRT display should be as shown in the figure. The fault column lists these
steps in numerical order beginning
with the first step from the ccw
position.
8-13
TM
11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
8-14
TM
11-6625-2781-14-1
Model 8552B
Service
Table 8-2. System Test and Troubleshooting Procedure (cont’d)
TEST
FAULT
16. Set LOG-LINEAR to LINEAR
and LINEAR SENSITIVITY to 1
m V/D IV. The CRT deflection
should be adjusted by the AMPL
CAL control to 7.1 divisions. If
display is correct, proceed to test
17.
AMPL CAL
cannot be
adjusted for
7:1 division
display.
PROCEDURE
See Service Sheets 12 and 13. Probable
trouble is in linear amplifier compensation circuit or linear scale factor circuit.
See Service Sheets 14, 15, and 16.
17. Set analyzer controls as follows:
SCAN WIDTH . . . . 0-100 MHz
SCAN WIDTH
PER DIVISION . . . . . . 10 MHz
BANDWIDTH . . . . . . . . 10 kHz
LOG - LINEAR . . . ...10 dB LOG
LOG REF LEVEL . . . . -10 dBm
Bottom 2
divisions of
CRT not
blanked.
Check base line clipper circuit.
Scan does
not occur
in all
positions
Check scan generator circuit.
Set SCAN WIDTH to PER DIVISION.
DISPLAY
UNCAL
does not
illuminate
Refer to System Test and Troubleshooting Procedure in RF Section Manual and
Service Sheet 17. Probable cause of
trouble is in the analogic circuit or
switching circuits.
Set SCAN TIME PER DIVISION
to 2 SECONDS, SCAN MODE to
SINGLE and push the button; a
dot should appear on the CRT display moving from left to right.
Push the SINGLE scan button
again; the dot should disappear.
Display
incorrect
Refer to Service Sheet 15 and repair the
scan control flip-flop or S2.
Set SCAN MODE to MAN and rotate the MANUAL SCAN knob.
Knob should control the dot on
the CRT.
Display
incorrect
Refer to Service Sheet 16 and check the
manual scan circuits.
Set SCAN MODE to INT and
SCAN TRIGGER to LINE, The
scan circuits should trigger and
sweep normally.
No sweep
on CRT.
Refer to Service Sheet 15 and check the
scan trigger circuits.
Turn BASE LINE CLIPPER full
CCW .
Switch SCAN TIME PER DIVISION through its range.
Return SCAN TIME PER DIVISION to 2 MILLISECONDS.
8-15
TM
11-6625-2781-14-1
Service
Model 8552B
SCHEMATIC DIAGRAM NOTES
Resistance in ohms, capacitance in picofarads, and inductance in microhenries unless otherwise noted.
P/O = part of.
*Asterisk denotes a factory-selectd value. Value shown is typical. Capacitors
may be omitted or resistors jumped.
Screwdriver adjustment.
Panel control.
Encloses front panel designations.
Encloses rear panel designation.
Circuit assembly borderline.
Other l ssembly borderline,
Heavy line with arrows indicates path and direction of main signal.
Heavy dashed line with arrows indicates path and direction of main feedback.
Wiper moves toward CW with clockwise rotation of control as viewed from shaft
or knob.
Numbers in star-on circuit assemblies show locations of test points,
Encloses wire color code. Code used (MIL-STD681) is the same as the resistor
color code. First number identifies the base color, second number the wider
stripe, and the third number identifies the narrower stripe. E.g.,
denotes
white base, yellow wide stripe, violet narrow stripe.
Table 8-3. Schematic Diagram Notes
8-16
TM 11-6625-2781-14-1
Model 8552B
Service
Table 8.4. IF Section Assembly and Component Locatown
Service Sheet
Assembly
Photo
A1
A2
A3
A4
A6
LC Filter
3 MHz Amplifier
SO MHz Converts
Crystal Filter
Power Supply
8
6,7
3
10,11
6,17,19
Figure 8-28
Figure 8-24,8-26
Figure 8-17
Figure 8-31, 8-33
Figure 8-22,8-46,8-50
A6
A7
A8
A9
A10
Scan Generator
Deflection Amplifier
Log Amplifier
Scan Time Switch
Log Ref Level
15,16,18
14
12, 13
5, 15, 17
6,9,11,13,18
Figure 8-42,8-44,8-47
Figure 8-40
Figure 8-36, 8-38
Figure 8-13
Figure 8-12
A11
A12
A13
Video Filter Switch
47 MHz APC
2 MHz VTO
13,17
4
4
Figure 8-11
Figure 8-19
Figure 8-20
Component
Service Sheet
Photo/Location
C1-4
C5
C6-10
CR1
DS1-6 LOG REF Index Lights
3
15
4
17
18
Chassis Top
Front Panel
Chassis Bottom
Rear Panel
Front Panel
DS7
DS8
DS 9
F1, 2
X
+
SCANNING
13
13
15
17
Front Panel
Front Panel
Front Panel
Rear Panel
J1
J2
J3
CAL OUTPUT
PEN LIFT OUTPUT
IF Section/RF Section
Front Panel
Front Panel
Chassis Top
J4
J5
J6
J7
J8
VERTICAL OUTPUT
SCAN IN/OUT
50 MHz input
47 MHz output
18
14,15,16
1,3,5,6,8,9,14,16
17,18,19
14
16
3
3
4
Front Panel
Front Panel
Chassis Top
Chassis Top
Chassis Bottom
3
On XA 3
2,14,17,19
Rear Panel
Q23, 24
19
Rear Panel
R1 - R3
R4
HORIZONTAL POSITION
R5
HORIZONTAL GAIN
19
14
16
Rear Panel
Front Panel
Front Panel
L1-4
P1
IF Section/Display Section
8-17
TM
11-6625-2781-14-1
Service
Model 8552B
Table 8-4. IF Section Assembly and Component Location (cont’d)
Component
Service Sheet
Photo/Location
R6
14,16
Front Panel
R7, 8
14
R9
15
Rear Panel
Front Panel
R10
BASE LINE CLIPPER
14
Front Panel
R11
VERTICAL GAIN
14
Front Panel
R12
Vernier
7
13
Front Panel
Front Panel
14
Front Panel
R16
13
Front Panel
R17
12
Rear Panel
R18
R19
R20
19
14,15,16
MANUAL SCAN
16
Chassis Top
Front Panel
Front Panel
S1
LOG-LINEAR
13, 14
S2
S3
S4
SINGLE SCAN
15
SCAN MODE
SCAN TRIGGER
15, 16, 17
15,16
Front Panel
11,12
W2
Green
Blue, shielded
11
Figure 8-8
Figure 8-8
W3
Horiz Output
14
Figure 8-8
W4
Cal output
18
Figure 8-8
W5
Orange
13
Figure 8-8
W6
Vert Output
14
Figure 8-8
W7
50 MHz Input
3
W8
47 MHz Output
3
Figure 8-8
Figure 8-8
W9
47 MHz APC
3,4
Figure 8-8
W10
Blue, Twisted Pair
Figure 8-8
W11
W12
Blue, Shielded Pair
Red
4,5
4, 5
R13, 14
R15
W1
8-18
VERTICAL POSITION
8,10
Front Panel
Front Panel
Front Panel
Figure 8-8
Figure 8-8
Figure 8-8. 8552B Component, Assembly, and Adjustment Locations
8-19
Figure 8-9.
8-20
Table 8-5.
Figure 8-10.
8-21
Figure 8-11.
Figure 8-12.
Figure 8-13.
8-22
Table 8-6.
Table 8-7.
Figure 8-14.
8-23
8-24
Figure 8-15.
Figure 8-16.
Figure 8-17.
Figure 8-18.
8-25
8-26
Figure 8-19.
Figure 8-20.
Figure 8-21.
8-27
8-28
Figure 8-22
Figure 8-23.
8-29
8-30
Figure 8-24.
Figure 8-25.
8-31
8-32
Figure 8-26.
Figure 8-27.
8-33
8-34
Figure 8-28.
Figure 8-29.
8-35
8-36
Figure 8-30.
8-37
8-38
Figure 8-31.
Figure 8-32.
8-39
8-40
Figure 8-33.
Figure 8-34.
8-41
Figure 8-35.
8-42
Figure 8-36.
Figure 8-37.
8-43
8-44
Figure 8-38.
Figure 8-39.
8-45
Figure 8-38.
8-46
8-48
Figure 8-42.
Figure 8-43.
8-49
8-50
Figure 8-44.
Figure 8-45.
8-51
8-52
Figure 8-47.
Figure 8-46.
8-53
8-54
Figure 8-49.
Figure 8-48
8-55
8-56
Figure 8-50.
Figure 8-51.
8-57
TM 11-6625-2781-14-1
APPENDIX A
REFERENCES
DA Pam 310-4
DA Pam 310-7
TB 43-0118
TM 38-750
TM 750-244-2
TM 11-6625-2781-14&P
TM 11-6625-2781-14-4
Index of Technical Manuals, Technical Bulletins, Supply Manuals
(Types 7, 8, and 9), Supply Bulletins, and Lubrication Orders.
US Army Equipment Index of Modification Work Orders.
Field Instructions for Painting and Preserving Electronics Command
Equipment Including Camoflauge Pattern Painting of Electrical
Equipment Shelters.
The Army Maintenance Management System (TAMMS).
Procedures for Destruction of Electronics Materiel to Prevent Enemy
Use (Electronics Command).
Operator’s Organizational, Direct Support and General Support
Maintenance Manual Including Repair Parts and Special Tools List
for Spectrum Analyzer IP-1216(P)/GR (Hewlett-Packard Model 141T).
Operator’s, Organizational, Direct Support, and General Support
Maintenance Manual for Plug-in Unit, Electronic Test Equipment
PL-1400/U (Hewlett-Packard Model 8555A).
A - 1
TM 11-6625-2781-14-1
APPENDIX D
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
D-1. General
This appendix provides a summary of the
maintenance operations for PL–1388/U. It authorizes categories of maintenance for specific
maintenance functions on repairable items and
components and the tools and equipment required to perform each function. This appendix
may be used as an aid in planning maintenance
operations.
D-2. Maintenance Function
Maintenance functions will be limited to and
defined as follows:
a. lnspect. To determine the serviceability of
an item by comparing its physical, mechanical,
and/or electrical characteristics with established standards through examination.
b. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical
or electrical characteristics of an item and comparing those characteristics with prescribed
standards.
c. Service. Operations required periodically to
keep an item in proper operating condition, i.e.,
to clean (decontaminate), to preserve, to drain,
to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust. T O maintain, within prescribed
limits, by bringing into proper or exact position,
or by setting the operating characteristics to
the specified parameters.
e. Align. To adjust specified variable elements
of an item to bring about optimum or desired
performance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic
equipments used in precision measurement.
Consists of comparisons of two instruments, one
of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the
accuracy of the instrument being compared.
g. lnstall. The act of emplacing, seating, or
fixing into position an item, part, module (component or assembly) in a manner to allow the
proper functioning of the equipment or system.
h. Replace. The act of substituting a serviceable like type part, subassembly, or module
(component or assembly) for an unserviceable
counterpart.
i. Repair. The application of maintenance
services (inspect, test, service, adjust, align,
calibrate, replace) or other maintenance actions
(welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part,
subassembly, module (component or assembly),
end item, or system,
i. Overhaul . T h a t m a n i n t e n a n c e e f f o r t
(service/action) necessary to restore an item to a
completely serviceable/operational condition as
prescribed by maintenance standards (i.e.,
D.MWR) in appropriate technical publications.
Overhaul is normally the highest degree of
maintenance performed by the Army. Overhaul
does not normally return an item to like new
condition.
k. Rebuild. Consists of those services/actions
necessary for the restoration of unserviceable
equipment to a like new condition in accordance
with original manufacturing standards. Rebuild
is the highest degree of materiel maintenance
applied to Army equipment. The rebuild operation includes the act of returning to zero those
age measurements (hours, miles, etc.) cons i d e r e d i n classifying Army equipment,/
components.
D-3. Column Entries
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to identify components, assemblies, subassemblies, and
modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2
contains the noun names of components, assemblies, subassemblies, and modules for which
maintenance is authorized.
c. Column 3, Maintenance Functions. Column
3 lists the functions to be performed on the item
listed in column 2. When items are listed without maintenance functions, it is solely for purD-1
TM
11-6625-2781-14-1
pose of having the group numbers in the MAC
and RPSTL coincide.
d. Column 4, Maintenance Category. Column 4
specifies, by the listing of a “worktime” figure in
the appropriate subcolumn(s), the lowest level of
maintenance authorized to perform the function listed in column 3. This figure represents
the active time required to perform that
maintenance function at the indicated category
of maintenance. If the number or complexity of
the tasks within the listed maintenance function vary at different maintenance categories,
appropriate “worktime” figures will be shown
for each category. The number of task-hours
specified by the “worktime” figure represents
the average time required to restore an item
(assembly, subassembly, component, module,
end item or system) to a serviceable condition
under typical field operating conditions. This
time includes preparation time, troubleshooting
time, and quality assurance/quality control time
in addition to the time required to perform the
specific tasks identified for the maintenance
functions authorized in the allocation chart.
Subcolumns of column 4 are as follows:
C-Operator/Crew
O-Organizational
F-Direct Support
H-General Support
D-Depot
e. Column 5, Tools and Equipment. Column 5
specifies by code, those common tool sets (not
individual tools) and special tools, test, and support equipment required to perform the designated function.
f. Column 6, Remarks. Not applicable.
D-4. Tool and Test Equipment Requirements
(Sect. III)
a. Tool or Test Equipment Reference Code.
The numbers in this column coincide with the
numbers used in the tools and equipment column of the MAC. The numbers indicate the
applicable tool or test equipment for the
maintenance functions.
b. Maintenance Category. The codes in this
column indicate the maintenance category allocated the tool or test equipment.
c. Nonencluture. This column lists the noun
name and nomenclature of the tools and test
equipment required to perform the maintenance functions.
d. National/NATO Stock Number. This column lists the National/NATO stock number of
the specific tool or test equipment.
e. Tool Number. This column lists the manufacturer’s part number of the tool followed by
the Federal Supply Code for manufacturers (5digit) in parentheses.
D-5. Remarks (Sect. IV)
Not applicable.
(Next printed page is D-3)
D - 2
TM 11-6625-2781-14-1
SECTION II MAINTENANCE ALLOCATION CHART
FOR
PLUG-IN UNIT, ELECTRONIC TEST EQUIPMENT PL-1388/U
D - 3
TM 11-6625-2781-14-1
SECTION II MAINTENANCE ALLOCATlON CHART
FOR
PLUG IN UNIT, ELECTRONIC TEST EQUIPMENT PL-1388/U
D-4
TM 11-6625-2781-14-1
SECTION III
TOOL AND TEST EQUIPMENT REQUIREMENTS
FOR
PLUG-IN UNIT, ELECTRONIC TEST EQUIPMENT PL-1388/U
6625-00-669-0747
6625-00-973-3986
6625-00-783-5965
6625-00-106-9622
662-00-106-9622
6625--00-159-2263
6625-00-913-9781
D-5
TM 11-6625-2781-14-1
SECTION IV.
D - 6
REMARKS
*U.S. GOVERNMENT PRINTING OFFICE: 1992 - 311-831/60940
By Order of the Secretary of the Army:
Official:
BERNARD W. ROGERS
General, United States Army
Chief o.f Staff
J.C. PENNINGTON
Brigadier General, United States Army
The Adjutant General
DISTRIBUTION:
Active Army:
USAINSCOM (2)
COE (1)
TSG (1)
USASAE (2)
USAARENBD (1)
DARCOM (1)
TECOM (2)
USACC (4)
TRADOC (2)
OS Maj Cored (4)
MDW (1)
Armies (2)
corps (2)
HISA (Ft Monmouth) (33)
Fort Gillem (10)
Fort Gordon (10)
Fort Huachuca (10)
Fort Carson (5)
Svc Colleges (1)
USASIGS (6)
USAICS (3)
USAADS (2)
USAFAS (2)
ARNG & (USAR: None.
For explanation of abbreviations used, see AR 310-50.
USAARMS (2)
USASATC&S (2)
USAIS (2)
USAES (2)
Ft Richardson (CERCOM Oft) (2)
AD (1) except
SAAD (30)
LBAD (14)
TOAD (14)
SHAD (3)
USA Dep (1)
Sig SEC USA Dep (1)
MAAG (1)
USARMIS (1)
USAERDAA (1)
USAERDAW (1)
Units org under fol TOE:
29-134 (1)
29-136 (1)
29-207 (2)
29-610 (2)
32-52 (1)
32-57 (1)
THE METRIC SYSTEM AND EQUIVALENTS
PIN: 034771-000
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