HP Q METER 4342A Service manual

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4342A Q-meter Operating and Service Manual
04342-90009
March 1983

MET6LoGY
JAN 21 1986
i
434.2A.
.
thERATING AND SERVICE MANUAL
I?!!
HEWLETT
PACKARD

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

CERTI FI CATI 0 N,
The Hewlett-Packard Company certifies that this instrument was
thoroughly tested and inspected and found to meet its published
specifications when it was shipped from the factory. The Hewlett-
Packard -Company further certifies that its calibration meusure-
ments are traceable to the U.S. National Bureau of Standards to
the extent allowed by the Bureau’s calibration facility.
WARRANTY AND ASSISTANCE
All Hewlett-Packard products are warranted against defects in
materials and workmanship. This warranty applies for one year
from the date of delivery, or, in the case of certain major compo-
nents listed in the operating manual, for the specified period. We
will repair or replace products which prove to be defective during
the warranty period provided they are returned to Hewlett-
Packard. No other warranty is expressed or implied. We are not
liable for consequential damages.
Service contracts or customer assistance agreements are available
for Hewlett-Packard products that require maintenance and re-
pair on-site.
For any assistance, contact your nearest Hewlett-Packard Sales and
Service Office. Addresses are provided at the back of this manual.

OPERATING AND SERVICE MANUAL
MODEL 4342A
Q METER
SERIAL NUMBERES COVERED
Manual Part No. 04342-90009
Microfiche Part No. 04342-90059 Printed: MAR. 1983
This manual cover-es Option 001 instruments as well
as the standard instrument.
aCOPYRIGHT: YOKOGAWA-HEWLETT-PACKARD, LTD., 1970
9-1, TAKAKURA-CHO, HACHIOJI-SHI, TOKYO, JAPAN
This manual applies directly to Model 43428 Q Meter
with serial prefixed 12125. Backdating changes in
SectionVII cover instruments with serials 12125-00590
and below. Instruments with higher serial prefix will
be covered in an Updating Manual Supplement at the
first of the manual.
OPTIONS COVERED
HEWLETT
PACKARD

Table of Contents Model 4342A
TABLE OF CONTENTS
Section Title Page
I GENERAL INFORMATION ................................... 1-I
l-l. Introduction.. ....................................... l-l
1-3. How the 4342A Measures ............................. l-2
l-8. Instruments Covered by Manual .......................
l-2
1-13. Specifications ....................................... l-3
1-15. Accessories Supplied ................................ 1-3
1-17. Accessories Available ............................... I-3
l-19. Options.. ........................................... l-3
II INSTALLATION ........................................... 2-l
2-l. Introduction ......................................... 2-i
2-3. Initial Inspection ..................................... 2-l
2-4. Mechanical Check .............................. 2-I
2-6. Performance Check ............................. 2-I
2-8. Damage Claim .................................
2-11. Storage and Shipment .................................
i::
2-12. Packaging ..................................... 2-l
2-13. Environment ................................... 2-I
2-14. Power Connection ....................................
2-15. Line Voltage ...................................
i-t
-
2-16.
Power Cable ................................... 2-1
III OPERATION
3-l.
........................................................................................
Introduction
;-;
-
3-3. Panel Controls, Connectors and Indicators ............. 3-l
3-5. Q Measurement General .............................. 3-l
3-8. Go/No-Go Function .................................. 3-l
3-10. Measurement Terminals .............................. 3-5
3-12. How to Connect Unknown .............................. 3-5
3-14. Measurement Parameters and Connection Methods ...... 3-5
3-16. Direct Method Limitations ....................... 3-5
3-18. Expansion of Measurement Ranges ............... 3-6
3-20. Capacitance Measurement ....................... 3-6
3-22. Resistance Measurement ........................ 3-6
3-24. High Q Measurement ........................... 3-7
3-26. Supplemental Equipment Used in Parallel
and Series Methods ......................... 3-7
3-30. Basic Q Meter Measurements ......................... 3-11
3-31. Quality Factor and Inductance
Measurements (Direct Connection) ........... 3-11
3-33. Q Measurement ................................ 3-11
3-35. dQ Measurement ............................... 3-12
3-37. Inductance Measurement ........................ 3-12
3-39. Inductance Measurement (at
a desired frequency). .. 3-13
3-41. Measurement Requiring Corrections ................... 3-13
3-42. Effects of Distributed Capacitance ................ 3-13
3-45. Measuring Distributed Capacitance
(Preferred Method) ......................... 3-14
3-47. Measuring Distributed Capacitance
(Approximate Method, Cd IlOpF) ............ 3-15
3-49. Correction for Q ............................... 3-16
3-55. Parallel and Series Connection Measurement Methods ... 3-1’7
3-56. General ....................................... 3-17
3-60. Additional Error Discussion ................... 3-17
3-64. Parallel Measurements ............................... 3-18
3-65. High Inductance Measurement ....................
3-18
3-67. Low CapacitanceMeasurement (~45OpF) .......... 3-19
3-69. High Resistance Measurement ................... 3-20
3-71. Dielectric Measurement ........................ 3-21

Model 43426 Table of Contents
Section Title Page
3-73. Series Measurements ................................ 3-23
3-74. Low Inductance Measurement .................... 3-23
3-76. High Capacitance Measurement (>450pF) ......... 3-24
3-78. Self-resonant Frequency Measurement
of High Capacitors .......................... 3-24
3-80. Low Resistance Measurement .................... 3-26
IV THEORY OF OPERATION ................................... 4-l
4-l. Introduction.. ....................................... 4-1
4-3. Q Determination and Measurement ..................... 4-l
4-6. Simplified Block Diagram ............................. 4-l
4-8. Block Diagram Description ........................... 4-l
4-10. Oscillator and Impedance Converter (AlAl) ....... 4-l
4-12. RF Power Amplifier (AlA2) ..................... 4-l
4-14. ALC Amplifier (P/O A8) ........................ 4-2
4-16. Q/AQ Range Attenuator (A3) ..................... 4-2
4-18. Tuning Capacitor and Injection Transformer (A2). .. 4-2
4-21. RF Amplifier and Detector (A5) .................. 4-2
4-24. DC Amplifier (A6) .............................. 4-2
4-26. Q Limit Selector (A7) ........................... 4-2
4-28. Circuit Details ...................................... 4-2
4-29. LC Oscillator (P/O AlAl) ....................... 4-2
4-31. Impedance Converter (P/O AlAl) and RF
Power Amplifier (AlA2) .... 4-3
4-33. ACL Amplifier (P/O A8) ........................ 4-3
4-35. Q Range Attenuator (A3) ........................ 4-3
4-37. Impedance Converter, RF Amplifier
and Detector (A5) ...... 4-3
4-39. DC Amplifier (A6) .............................. 4-3
4-41. Q Limit Selector (A7) ........................... 4-3
4-43. Power Supply (P/O ~8) ......................... 4-3
V MAINTENANCE ............................................ 5-l
5-l. Introduction ......................................... 5-l
5-3. Test Equipment Required ............................. 5-l
5-5. Q Accuracy Considerations ........................... 5-l
5-7. Option .............................................. 5-l
5-9. Performance Checks ................................. 5-3
5-11. Frequency Accuracy Check.. .................... 5-3
5-12. QRange Check.. ............................... 5-3
5-13. AQ Range Check ............................... 5-4
5-14. Capacitance Accuracy Check .................... 5-4
5-15. Q Limit Operation Check ........................ 5-5
5-16. Adjustment and Calibration Procedures ................ 5-8
5-18. Power Supply Adjustment ........................ 5-8
5-19. Oscillator Level Adjustment ..................... 5-8
5-20. Oscillator Frequency Adjustment ................. 5-8
5-21. Q Voltmeter Adjustment ........................ 5-9
5-22. Q Analog Output Adjustment ..................... 5-10
5-23. Frequency Response Adjustment ................. 5-11
5-24. Q Limit Selector Adjustment ..................... 5-11
5-25. Option 001 Maintenance Instructions ................... 5-12
5-27. Option 001 Performance Checks .................. 5-12
5-29. Option 001 Calibration and Adjustment Procedures . 5-13
5-31. Dial Re-stringing Instructions ......................... 5-14
5-34. Frequency Dial ................................. 5-14
5-35. L/C Dial ...................................... 5-14
5-36. AC Dial ....................................... 5-14
5-37. Troubleshooting Guides ............................... 5-18
5-39. High Frequency Line Noise ...................... 5-18
5-40. Operating in a Strong Electromagnetic Field ....... 5-18
5-41. Operating in High Humidity Environment .......... 5-18
. .
111

Table of Contents
List of Tables
Model 4342A
Section Title Page
5-42. Elementary Troubleshooting Guide ..................... 5-18
5-43. Meter Zeroing Troubles ........................ 5-18
5-44. Incorrect Q Meter Indication ..................... 5-18
5-45. Low Q Indication in High Frequency
Measurements .......... 5-19
5-46. Faulty Q Limit Operation ....................... 5-19
VI REPLACEABLE PARTS .................................... 6-l
6-l. Introduction.. ....................................... 6-l
6-6. Ordering Information ................................. 6-l
VII MANUAL CHANGES AND OPTIONS .......................... 7-l
7-1. Options ............................................. 7-l
7-3. Special Instruments ................................. 7-l
7-5. Manual Changes ..................................... 7-l
7-7. Later Instruments .............................. 7-l
7-8. Earlier Instruments ............................ 7-l
7-9. Option 001 Instruments ......................... 7-l
VIII CIRCUIT DIAGRAMS ....................................... 8-l
8-l. Introduction ......................................... 8-l
8-4. GeneralNotes ....................................... 8-l
APPENDIX OPTION 001 ........................................ A-l
I Replaceable Parts ................................... A-l
II Manual Changes ..................................... A-l
III Circuit Diagrams .................................... A-2
LIST OF TABLES
Number
l-l.
l-2.
2-l.
3-l.
3-2.
3-3.
3-4.
5-l.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
6-l.
6-2.
7-l.
A-l.
A-2.
Title Page
Specifications .......................................
1-2
Accessories - Typical Values ......................... l-3
AC Line Fuse ....................................... 2-l
Methods of Connecting Unknown ....................... 3-10
16451A (4342A-KOl) Typical Characteristics ............ 3-21
Formulas for Calculating Q and Impedance Parameters
from Parallel and Series Measurements .......... 3-27
Formulas Relating Series and Parallel Components ...... 3-27
Recommended Test Equipment ........................ 5-o
Q Correlation Factors ............................... 5-l
Frequency Accuracy Check
........................... 5-2
QRange Check ...................................... 5-3
Capacitance Accuracy Check .......................... 5-5
Adjustable Components ............................... 5-7
Frequency Adjustment. ............................... 5-8
Frequency Accuracy Check (Option 001) ................
5-12
Frequency Adjustment (Option 001). .................... 5-13
List of Reference Designators and Abbreviations ........ 6-l
Reference Designation Index .......................... 6-3
Backdating Changes .................................. 7-l
Reference Designation Index for Option 001 (Al Al Ass’y). . A-3
Reference Designation Index for Option 001 (A5 Ass’y) ....
A-5
iv

Model 4342A List of Illustrations
LIST OF ILLUSTRATIONS
Number Title Page
l-l. Model 4342A Q Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l-l
3-l.
3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
3-8.
3-9.
3-10.
3-11.
Front Panel Controls ................................ 3-2
Rear Panel Controls and Connectors ................... 3-4
Measurement Terminal Circuit ....................... 3-5
Inductance Measurement Ranges vs. Frequency
(direct method) .........
3-6
Ranges of Measurable Resistance ...................... 3-7
Zeroing Procedure ...................................
3-8
Distributed Capacitance in Direct Connection ........... 3-11
Distributed Capacitance Circuit Model ................. 3-13
Typical Variation of Effective Q and
Inductance with Frequency ....... 3-14
Correction Chart for Distributed Capacitance ........... 3-14
Residual Parameters ................................. 3-17
4-l. Series Resonant Circuit ..............................
4-o
4-2.
Model 43426 Simplified Block Diagram ................. 4-O
4-3. Constant Voltage Injection System .....................
4-2
5-l. Q Range Check ......................................
5-2
5-2. AQ
Range Check .....................................
5-3
5-3. Capacitance Accuracy Check ..........................
5-4
5-4.
Model 4342A Adjustment Locations ....................
5-6
5-5.
Model 4342A Assembly Locations
...................... 5-6
5-6. Voltmeter Adjustment ................................ 5-10
5-7.
Frequency Response Adjustment ...................... 5-11
5-8. Frequency Dial Restringing
........................... 5-15
5-9.
Main C Dial Restringing .............................. 5-16
5-10. AC Dial Restringing .................................. 5-17
5-11.
Tuning Capacitor Disassembly (top view) ............... 5-19
5-12. Troubleshooting, Oscillator Section ................... 5-21
5-13. Troubleshooting, Voltmeter Section ................... 5-19
6-l.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
Exploded View of Oscillator Ass’y ..................... 6-22
Exploded View of Tuning Capacitor Ass’y .............. 6-24
Exploded View of Q Range Attenuator Ass'y ............. 6-26
Exploded View of Frequency Multiplier, Over Limit
Indicator, and Frequency Scale Indicator .......... 6-27
Exploded View of Main and Vernier Capacitor
Dial Ass’y ...... 6-28
Exploded View of Oscillator Lever Ass’y ............... 6-29
Exploded View of Rear Panel .......................... 6-30
Exploded View of Handle Section ......................
6-32
7-1. A7 04342-7707 ....................................... 7-2
7-2. All 04342-7711 ...................................... 7-2
7-3.
Partial Schematic of Power Supply
.................... 7-5
8-1.
Schematic Diagram Notes . .
. . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8-2. Function Overall Block Diagram
. . . . . . . . . . . . . . . . . . . . . . 8-3
8-3.
Oscillator Ass'y Al, Q Range Attenuator Ass'y A3,
Power Supply & ACL Amplifier Ass’y A8,
Frequency Multiplier & Over Limit Indicator Ass'y AlO.. 8-5

List of Illustrations Model 4342A
Number Title Page
8-4. Tuning Capacitor Ass’y A2, QRange Attenuator Ass’y A3,
Impedance Converter Ass’y A4,
Meter Scale Indicator Ass’y All . . . . . . . . . . . . . . . . . . . . . . . 8-7
8-5. Q Range Attenuator Ass’y A3, Impedance Converter, RF
Amplifier &Detector Ass’y A5, DC Amplifier Ass’y A6,
Meter Scale Indicator Ass’y All . . . . . . . . . . . . . . . . . . . . . . 8-9
8-6. Q Limit Selector Ass’y A7 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Multiplier & Over Limit Indicator Ass’y A 10 . . 8-11
8-7. Power Supply & ALC Amplifier Ass’y A8 . . . . . . . . . . . . . . 8-13
A-l Oscillator Ass’y Al (Option 001) . . . . . . . . . . . . . . . . . . . . . . A-7
A-2. Impedance Converter, RF Amplifier & Detector
Ass’y A5 (Option 001) . . . . . A-9