HP 5061B Service manual

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J: OPERATING AND SERVICE MANUAL
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50618
Cesium Beam
Frequency Standard
F /i OW HEWLETT
~ ~ PACKARD
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CERTIFICATION
Hewlett-Packard Company certifies that this instrument met its published specifications at
the time of shipment from the factory. Hewlett-Packard Company further certifies that its
calibration measurements are traceable to the United States National Bureau of Standards,
to the
extent allowed by the Bureau's calibration facility, and to the calibration facilities of
other International Standards Organization members.
WARRANTY AND ASSISTANCE
This Hewlett-Packard product is warranted against defects in materials and workmanship
for a period of one year from the date of shipment except that in the case of certain components
listed in Table 1-1 of this manual, the warranty shall be for the specified period. Hewlett-Packard
will, at its option, repair or replace products which prove to be defective during the warranty
period provided theyare returned to Hewlett-Packard, and provided the preventive maintenance
procedures in this manual are fOllowed. Repairs necessitated by misuse of the product are not
covered by this warranty. NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETT-PACKARD IS NOT LIABLE FOR
CONSEQUENTIAL DAMAGES.
Service
contracts or customer assistance agreements are available for Hewlett-Packard
products.
For
any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses
are provided at the back
of this manual. •
Scans by Artekmedia => 2011

rliiW HEWLETT
~~ PACKARD
OPERATING AND SERVICE MANUAL
5061B
CESIUM BEAM FREQUENCY STANDARD
(Including Options 003 and 004)
SERIAL PREFIX
This manual applies directly to HP Model5061B Cesium
Beam Frequency Standards with Serial Prefix 2636A
and units with Serial Numbers 2624A00152 through
2624A00156.
With changes described in Section VII (Manual Back-
dating), this manual applies to instruments with Serial
Numbers 2624A and 2612A. Also covered in Section VII
is the Series 2612 A2 Battery Charger Assembly (Part of
Option 003).
SERIAL PREFIXES NOT LISTED
For Serial Prefixes above 2636A, a "Manual Updating
Changes" sheet is included with this manual.
OPTIONS
This manual applies directly to Model 5061B instru-
ments with Option 003 (Time Standard and Standby
Power Supply) and Option 004 (High Performance
Beam Tube).
@HEWLETT-PACKARD COMPANY 1986
5301 STEVENS CREEK BLVD., SANTA CLARA, CA 95051-7299
MANUAL PART NUMBER: 05061-9078
MICROFICHE PART NUMBER 05061·9079 PRINTED: OCTOBER 1986
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Section
I
TABLE OF CONTENTS
GENERAL INFORMATION
HP 5061B
Table of Contents
Page
1-1
1-1. Introduction. . . . . . . .. . . . . . .. . . .. . .. . . . .. . . . . .. .. . . . . .. .. . . . .. . .. . . 1-1
1-4. Manual Summary ................................................ 1-1
1-6. Options ........................................................... 1-1
1-8. Terminology. . . . . . ... . . . . . .. . . . .. . . . . . .. . . . . .. . . . . . . .. .. . . . . .. .. . . 1-2
1-10. Specifications. . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . .. .. . . . .. . .. . . . . .. . 1-2
1-12. Instrument Identification ......................................... 1-2
1-14. Safety Considerations ............................................ 1-2
1-16. Accessories. . . . .. . . ... . . . . . .. . . .. . . . . . .. . . . .. . . . . .. . . . . . . . . .. . . . . . 1-6
1-18. Recommended Test Equipment for the HP 5061B ................. 1-7
II INSTALLATION ......................................................... 2-1
2-1.
2-3.
2-5.
2-6.
2-9.
2-11.
~ 2-13.
2-14.
2-16.
2-18.
2-20.
2-22.
2-24.
2-26.
2-28.
Introduction ...................................................... 2-1
Unpacking and Inspection. ....................................... 2-1
Storage and Shipment ............................................ 2-1
Environment ................................................... 2-1
Packaging ...................................................... 2-1
Tagging for Service ............................................. 2-1
Electrical Power Connections ..................................... 2-2
AC Line Voltage................................................ 2-2
DC Line Voltage................................................ 2-2
Power Cables ..................................................... 2-2
AC Powel' Cable Installation .................................... 2-2
DC Power Connector ............................................ 2-3
Mating Connectors ............................................. 2-3
Operation as Bench or Rack Instrument . . . . . .. . . . .. . . . . .. . . . . . . . .. 2-3
Installation Location ............................................. 2-4
III OPERATION ............................................................. 3-1
h.. 3-1.
~3-3.
3-5.
3-7.
3-9.
3-11.
3-12.
3-14.
3-16.
3-18.
3-20.
3-23.
3-25.
3-27.
3-29.
3-32.
3-34.
3-36.
3-39.
3-41.
3-42.
3-45.
3-47.
3-51.
Introduction ...................................................... 3-1
Controls and Indicators on Front, Top, and Rear Panels........... 3-1
Front Panel LED (Light Emitting Diode) Indications ............ 3-5
Front Panel MODE Switch Functions........................... 3-6
Front Panel CIRCUIT CHECK Switch and Meter ............... 3-6
Turn-On Procedures............................................... 3-7
Introduction to Turn-On ........................................ 3-7
Initial Turn-On Procedure ....................................... 3-7
C-Field Adjustment Procedure................................... 3-8
CIRCUIT CHECK Meter Indications ............................ 3-9
Degaussing -General Information ............................. 3-9
HI CURRENT Degaussing Procedure ........................... 3-9
LO CURRENT Degaussing Procedure ........................... 3-10
Routine Operating Procedures ................................... 3-10
Operation with Time Standard (Part of Option 003) ............... 3-11
Setting the Clock Pulse to an External CI~k .................... 3-11
Automatic Synchronization ..................................... 3-11
Manual Synchronization ........................................ 3-11
Setting the LCD Clock Display .................................. 3-13
Operation with Internal Standby Battery
(Part of Option 003) ............................................... 3-13
Initial Charging of Battery ..................................... 3-13
Recharge Time Requirements ................................... 3-13
Operation From an External DC Supply ........................ 3-13
HP 5061B Power Removal ...................................... 3-14
111
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HP 5061B
Table of Contents
Section
III (Cont'd.) 3-53.
3·55.
3-57.
TABLE OF CONTENTS (Continued)
Page
Operation with High Performance Tube (Option 004) .............. ,3-14
HP 5061B Operating Record ...................................... 3-14
In-Cabinet Performance Test ...................................... 3-14
IV THEORY OF OPERATION ............................................... 4-1
IV
4-1.
4-13.
4-15.
4-16.
4-21.
4-28.
4-41.
4-101.
4-105.
4-113.
4-115.
4-120.
4-127.
4-141.
4-149.
4-155.
4-157.
4-159.
4-161.
4-163.
4-166.
4-169.
4-171.
4-173.
4-175.
4-177.
4-179.
4-181.
4-184.
4-186.
4-191.
4-194.
4-200.
4-205.
4-207.
4-209.
4-211.
4-213.
4-216.
4-220.
4-224.
4-231.
4-240.
4-242.
4-247.
4-256.
4-270.
4-272.
4-275.
4-279.
4-281.
Introduction ..................................................... .
Logic
Symbols ................................................... .
Explanation of New Logic Symbols (by F.A. Mann)* ............. .
Introduction ................................................... .
Symbol Composition ........................................... .
Qualifying Symbols ............................................ .
Dependency
Notation .......................................... .
Bistable Elements ............................................. .
Coders
......................................................... .
Use of Binary Grouping to Produce Affecting Inputs ........... .
Sequence of Input Labels ...................................... .
Sequence of Output Labels ..................................... .
Al Synthesizer Description .................................... .
Phase-Locked Voltage-Controlled
Oscillator .................... .
A2
Battery Charger Description (Part of Option 003) ............. .
Rectifier
....................................................... .
Wave
Clipper .................................................. .
Charge Current Regulator ..................................... .
Current Sense Resistor ......................................... .
Current Detector Switch ....................................... .
Low
Battery Dropout .......................................... .
A3 Multiplier Description
........................................ .
Phase Modulator (A3 Multiplier) ............................... .
Balanced Doubler (A3 Multiplier) .............................. .
10 MHz Filter (A3 Multiplier) .................................. .
10-to-30 MHz TripIer (A3 Multiplier) ............................ .
30 MHz Filter (A3 Multiplier) .................................. .
30-To-90-MHz Class C TripIer and Filter (A3 Multiplier) ......... .
5-MHz
Isolation Amplifier (A3 Multiplier) ...................... .
A4
Harmonic Generator Description ............................. .
A5
Digital Divider Description (Part of Option 003) ............... .
A5A1 Multiplier-Amplifier
....................................... .
A5A2 5-Volt
Regulator ......................................... .
A5A3 10 MHz
to 1 PPS Divider and Delay ..................... .
A5A3
TIME DELAY Switches and Dividers Operation ......... .
A5A4
Interconnect ............................................. .
A6
Frequency Output Assembly Description ...................... .
5 MHz-to-10 MHz Doubler
...................................... .
1 MHz Divider
................................................. .
100 kHz Divider ............................................... .
A7 AC Amplifier Description
..................................... .
A8
Phase Detector Description ........... \ ....................... .
A9
Operational Amplifier Description ............................ .
AlO
Quartz Crystal Oscillator Description ........................ .
Circuit Board Operation (A10) .......................... :; ..... .
All Cesium Oven Controller Description ......................... .
Cesium
Beam Tube .............................................. .
Cesium Beam Tube Physics (A12) .............................. .
Cesium
Beam Tube ............................................ .
Beam Tube Discrimination Action ............................. .
Cesium Beam Tube Test Input (LF Coil) ........................ .
4-1
4-2
4-2
4-2
4-3
4-3
4-7
4-14
4-14
4-15
4-15
4-16
4-17
4-18
4-19
4-20
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4-20
4-20
4-20
4-20
4-21
4-21
4-21
4-21
4-21
4-21
4-21
4-21
4-22
4-22
4-22
4-23
4-23
4-23
4-23
4-24
4-24
4-24
4-25
4-25
4-26
4-27
4-27
4-27
4-28
4-29
4-29
4-30
4-31
4-31
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Section
IV (Cont'd.) 4-285.
4-289.
4-293.
4-300.
4-303.
4-307.
4-310.
4-312.
4-315.
4-318.
4-320.
4-323.
4-325.
4-327.
4-329.
4-331.
4-334.
4-336.
4-338.
4-340.
4-342.
4-345.
4-347.
4-349.
4-352.
4-354.
4-355.
4-357.
TABLE OF CONTENTS (Continued)
HP 5061B
Table of Contents
Page
A13 Buffer Amplifier ............................................. 4-31
A14 Logic Assembly .............................................. 4-32
Second Harmonic Channel (A14) ................................ 4-32
Fundamental Channel (A14) .................................... 4-32
Integrator Limit Sensor (A14) .............. ,...................... 4-33
A15 Power Regulator Description ................................. 4-33
Input Rectifier and Filter (A15) ................................. 4-34
Standby Power Supply Gate (A15) ............................. : 4-34
+18.7V Regulator/Current Limiter (A15) ........................ 4-34
CoField Current Regulator (A15) ................................. 4-34
A16 Clock Display (Part of Option 003)/
A16 LED Display (Standard) Description ................ " 4-34
Front Panel LED Annunciators ................................. 4-35
A16 Counter and LCD Drive Circuitry .......................... 4-35
Oscillator/Divider (U14) ........................................ 4-35
Schmitt Trigger (U15) ........................................... 4-35
Seconds Stage .................................................. 4-35
Minutes Data Select ............................................ 4-35
Minutes Stage .................................................. 4-36
Hours Data Select .............................................. 4-36
Hours Stage .................................................... 4-36
Liquid
Crystal Display ........................................ " 4-36
A17 Terminal Board Description .................................. 4-36
(A18) +3500 VDC Power
Supply Description ....................... 4-37
Power Supply (A18) ............................................. 4-37
Ion
Pump Current Monitor (A15) ................................ 4-37
(A19) -2500 VDC
POWER SUPPLY ............................... 4-37
Power
Supply (A19) ............................................. 4-37
Electron Multiplier Regulator (A15) ............................. 4-37
V MAINTENANCE ......................................................... 5-1
5-1. Introduction .................................................... " 5-1
5-3. Safety Considerations ............................................ 5-1
5-5. HP 5061B Assembly Designations ................................ 5-1
5-7. Periodic Maintenance ............................................. 5-2
5-10. Standby Battery Periodic Maintenance (Part of Option 003) ....... 5-2
5-12. Circuit Check Switch and Meter Information ...................... 5-3
5-15. BATTERY Position ............................................. 5-3
5-17. SUPPLY Position............................................... 5-3
5-19. ION PUMP I Position .......................................... 5-3
5-21. OSC OVEN Position ............................................ 5-3
5-23. CS OVEN Position ............................................. 5-3
5-25. 5 MHz Position ................................................. 5-3
5-27. MULT Position ................................................. 5-3
5-29. BEAM I Position ............................................... 5-3
5-31. CONTROL Position ................... \'........................ 5-3
5-33. 2ND HARMONIC Position ..................................... 5-4
5-35. HP 5061B Cabinet Cover Removal ................................ 5-4
5-37. HP 5061B Troubleshooting or Problem Analysis ................... 5-4
5-40. Al Synthesizer Maintenance ...................................... 5-4
5-42. Al Synthesizer Operational Check .............................. 5-4
5-44. Al Synthesizer Troubleshooting ................................. 5-4
5-49. Test and Replacement of AlAI Y1, L2, and L3 ................... 5-6
5-51. Al Synthesizer Assembly Replacement and Adjustments ........ 5-7
5-53. A2 Battery Charger Maintenance (Part of Option 003) ............. 5-7
v
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HP 5061B
Table
of Contents
Section
V (Cont'd.)
vi
5-55.
5-57.
5-59.
5-64.
5-66.
5-68.
5-70.
5-72.
5-74.
5-76.
5-78.
5-80.
5-83.
5-84.
5-85.
5-87.
5-88.
5-90.
5-92.
5-94.
5-98.
5-100.
5-1Ol.
5-103.
5-105.
5-108.
5-109.
5-11l.
5-114.
5-116.
5-118.
5-119.
5-12l.
5-123.
5-125.
5-127.
5-129.
5-133.
5-135.
5-136.
5-138.
5-139.
5-14l.
5-144.
5-148.
5-15l.
5-153.
5-157.
5-162.
5-164.
5-166.
5-170.
5-173.
5-175.
5-177.
5-179.
5-183.
TABLE OF CONTENTS (Continued)
A3 Multiplier Maintenance ....................................... .
A3 Multiplier
Operational Check ............................... .
A3
Repair and Replacement Considerations .................... .
A3 Multiplier Replacement
Considerations ..................... .
A4
Harmonic Generator Maintenance ............................ .
A4
Operational Check and Fault Isolation ..................... .
A4
Replacement Considerations ................................ .
A5
Digital Divider Maintenance (Part of Option 003) ............. .
A6
Frequency Output Assembly Maintenance .................... .
A6
Operational Check ......................................... .
A6
Repair and Replacement Considerations .................... .
A6
Frequency Output Assembly ................................ .
A6 10 MHz
Adjustment Procedure .............................. .
A6 1 MHz Divider
Adjustment Procedure ....................... .
A6 100 kHz Divider
Adjustment Procedure ..................... .
A7 AC Amplifier
Maintenance ................................... .
A7 AC Amplifier Description
................................... .
A7 AC Amplifier
Operational Check ........................... .
A7 AC Amplifier Noise
Check .................................. .
A7 AC Amplifier Troubleshooting
.............................. .
A7 AC Amplifier
Repair or Replacement Considerations ........ .
A8
Phase Detector Maintenance ................................. .
A8
Phase Detector Description ................................. .
A8
Phase Detector Operational Check .......................... .
A8
Phase Detector Repair or Replacement Considerations ...... .
A9
Operational Amplifier Maintenance .......................... .
A9
Operational Amplifier Description .......................... .
A9
Operational Amplifier Check ............................... .
A9
Repair and Replacement Considerations .................... .
A9
Operational Amplifier Replacement Considerations ......... .
AlO Oscillator
Maintenance ...................................... .
A10 Description ............................................... .
A10 Oscillator Operational Checks ............................. .
A10 +15V Reference Supply Check ............................. .
Output Amplitude and Distortion Check ........................ .
A10 Electronic Frequency Control (EFC) Check ................ .
A10 Repair Considerations ..................................... .
A10 Oscillator Adjustments .................................... .
A10 Output Amplitude Adjustment ............................. .
A10 Oscillator Replacement .................................... .
All Cesium Oven Controller Maintenance ....................... .
All Cesium Oven Controller Description ....................... .
All Operational Checks ....................................... .
All Adjustments and Troubleshooting ......................... .
All Repair and Replacement Considerations ................... .
A12 Cesium
Beam Tube Maintenance ............................ .
A12
Warranty ........................... \ ....................... .
A12
Normal Operation ........................................... .
A12 Cesium
Beam Tube Failures ................................. .
Systemic Failures .............................................. .
End-of-Life
Failure ............................................. .
A12 Cesium
Beam Tube Specifications ........................... .
A12 Cesium
Beam Tube Operational Checks ..................... .
Low
Frequency (LF) Coil Check ................................ .
Microwave
Check .............................................. .
Beam Tube Signal Check ...................................... .
Signal-to-Noise Check
.......................................... .
Page
5-7
5-7
5-7
5-12
5-12
5-12
5-12
5-12
5-12
5-12
5-12
5-12
5-13
5-13
5-13
5-13
5-13
5-13
5-14
5-14
5-14
5-14
5-14
5-15
5-15
5-15
5-15
5-15
5-16
5-16
5-16
5-16
5-16
5-16
5-16
5-17
5-17
5-17
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5-17
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5-18
5-18
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5-20
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5-25
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Section
v (Cont'd.) 5-188.
5-190.
5-192.
5-194.
5-196.
5-198.
5-20l.
5-205.
5-207.
5-210.
5-212.
5-214.
5-216.
5-218.
5-220.
5-222.
5-225.
5-227.
5-229.
5-23l.
5-233.
5-234.
5-235.
5-236.
5-237.
5-239.
5-24l.
5-242.
5-244.
5-249.
5-250.
5-252.
5-254.
5-256.
5-258.
5-260.
5-26l.
5-263.
5-265.
5-267.
5-269.
5-273.
5-275.
5-277.
5-279.
5-28l.
5-283.
5-285.
5-286.
5-290.
5-292.
5-293.
5-294.
5-296.
5-298.
HP 5061B
Table of Contents
TABLE OF CONTENTS (Continued)
Page
A12 Cesium Beam Tube Replacement ............................. 5-26
Removal
of Cesium Beam Tube ................................. 5-26
Disposal Procedure for Hewlett-Packard Cesium
Beam Tubes .... 5-27
Cesium Beam Tube Installation ................................. 5-27
A12 Cesium
Beam Tube Adjustment Procedure .................. 5-29
Initial Beam I Adjustment ........................................ 5-29
Harmonic Generator Adjustments ................................. 5-29
Beam I Adjustment ............................................... 5-31
Beam Current Record ............................................. 5-32
Phase Modulation Frequency Adjustment ......................... 5-32
Phase Detector Zero Adjustment .................................. 5-32
Operational Amplifier Adjustments ............................... 5-32
Phase Modulation Amplitude Adjustment ......................... 5-33
Phase Modulation Phase Adjustment ............................. 5-33
Loop
Gain Adjustment ............................................ 5-34
Logic
Adjustments ................................................ 5-34
A13 Buffer Amplifier
Maintenance ................................ 5-35
A13
Replacement Considerations ................................ 5-35
A14 Logic
Assembly Maintenance ................................ 5-35
A14 Logic
Assembly Operational Checks ........................ 5-36
A14
Fundamental Channel Operational Check .................. 5-36
A14 Second
Harmonic Channel Operational Check .............. 5-36
A14
Integrator Limit Operational Check ........................ 5-36
A14
Synthesizer Operational Check ............................. 5-36
A14 Logic
Assembly Troubleshooting ........................... 5-37
A14
Replacement Considerations ................................ 5-37
A15 Power
Regulator Maintenance ................................ 5-37
A15
Power Regulator Description ............................... 5-37
A15 Power Regulator
Operational Checks ....................... 5-37
A15
Power Regulator Replacement Considerations .............. 5-37
A17
Terminal Board Maintenance ................................. 5-37
A18 +3500 Volt Power
Supply Maintenance ....................... 5-38
A18 +3500 Volt Power
Supply Replacement Considerations ...... 5-38
A19 -2500 Volt Power
Supply Maintenance ........................ 5-38
A19
Replacement Considerations ................................ 5-39
Time
Standard and Standby Power Supply
(Option 003) Maintenance ................................. 5-39
A2
Battery Charger Maintenance (Part of Option 003) ........... 5-39
A2
Battery Charger Operational Check ......................... 5-39
Battery Reconditioning ......................................... 5-40
Memory Effect .................................................. 5-40
Sustained Overcharge Effect .................................... 5-40
A2 Battery Charger Troubleshooting ............................ 5-40
A2 Battery Charger Removal and Replacement Instructions ..... 5-41
A5 Digital Divider Maintenance (Part Of Option 003) ............ 5-41
A5 Digital Divider Operational Check ........................... 5-41
A5 Preparation for Troubleshooting and ~djustments ........... 5-41
A5 Digital Divider Adjustments (Tuning) ........................ 5-41
A16 Clock Display and LED Display Assembly Maintenance .... 5-41
General Description ............................................. 5-41
A16 Operational Check ......................................... 5-42
Front Panel LED Operational Check ............................ 5-42
Front Panel Liquid Crystal Display Operational Check
(Option 003 only) ......................................... 5-42
A16 Pre-repair
Procedures. . . . .. . . . . . . .. . . .. . . . . . . .. . . . . . . . . . . . .. 5-43
A16
Assembly Removal ......................................... 5-43
A16 Troubleshooting
............................................ 5-44
vii
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HP 5061B
Table of Contents
List of Tables
viii
TABLE OF CONTENTS (Continued)
Section Page
V(Cont'd.). 5-301. A16 Power Supply Check ....................................... 5-44
5-303.
5-305.
5-307.
5-310.
5-313.
1PPS Input Check .............................................. 5-44
A16 LCD
Display Test .......................................... 5-44
A16
Data Selector Test .......................................... 5-44
A16
LED Troubleshooting ...................................... 5-45
After Service Product Safety Checks .............................. 5-46
VI REPLACEABLE PARTS ................................................. 6-1
6-1. Introduction. . . .. . .. . . .. . . . .. . . . . . .. . . . .. . . . . . . . . .. . . . . . .. . . . . .. .. 6-1
6-3. Abbreviations and Reference Designations ........................ 6-1
6-5. Replaceable Parts List ............................................ 6-1
6-10. Ordering Information ............................................. 6-1
6-13. Direct Mail Order System......................................... 6-1
VII MANUAL CHANGES .................................................... 7-1
7-1. Introduction. . . . . . .. . . .. . . . . .. .. . . .. . . .. . . . . . .. . . . . . .. . . . . .. . . . . . . 7-1
7-3. Manual Changes ................................................. 7-1
7-5. Newer Instruments ............................................. 7-1
7-7. Older Instruments .............. ,............................... 7-1
VIII CIRCUIT DIAGRAMS .................................................... 8-1
8-1.
8-3.
8-5.
Introduction ..................................................... .
Schematic Diagram Notes and Reference Designations ........... .
Safety Considerations ........................................... .
Appendix A Cesium Beam Tube Vacuum Check Following
8-1
8-1
•
8-1
HP 5061B Storage ......................................................... A-I
Appendix B Pumping the Cesium Beam Tube During Storage
When Tube is Stored While Removed from
the HP 5061B Chassis ..................................................... B-1
LIST OF TABLES
Table Page
1-1. Specifications ............................................................. 1-3
1-2. Equipment Supplied ...................................................... 1-6
1-3. Accessories Available ..................................................... 1-6
1-4. Recommended Test Equipment............................................ 1-7
2-1. 115/230 Volt Conversion .......................... ~....................... 2-2
2-2. Mating Connectors ....................................................... 2-3
3-1. Front-Panel LED Indications (Standard HP 506IB) ........................ 3-5
3-2. MODE Switch Functions ................................................. 3-6
3-3. Operating Checks (With CIRCUIT CHECK Switch) ....................... 3-6
3-4. Operator Adjustments .................................................... 3-10
3-5. In-Cabinet Performance Check ............................................ 3-15
4-1. Assembly Designations and Names ....................................... 4-2
4-2. General Qualifying Symbols .............................................. 4-4
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