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OPERATING AND SERVICE MANUAL
MULTIMETER
3465A
HEWLETT~ PACKARD
OPERATING AND SERVICE MANUAL
MODEL 3465A
MULTIMETER
Serial Numbers: 1546A01501 and greater
IMPORTANT NOTICE
This loose leaf manual does not normally require a change sheet. All major
change information has been integrated into the manual by page revision.
In cases where only minor changes are required, a change sheet may be
supplied.
If the Serial Number of your instrument is lower than the one on this title
page, the manual contains revisions that do not apply to your instrument.
Backdating information given in the manual adapts it to earlier
instru ments.
I
Where practical, backdating jnformation is in,tegrated into the text, parts
list and schematic diagrams. Backdating changes are denoted by a delta
sign. An open delta (~) or lettered delta (~A) on a given page, refers to the
corresponding backdating note on that page. Backdating changes not
integrated into the manual are denoted by a numbered delta (~1) which
refers to the corresponding change in the Backdating section (Section
VIII).
Jj\ This symbol is an international symbol meaning "refer to the
~ Operating and Service Manual." The symbol flags important
operating instructions in Figure 3-1 and Paragraphs 3-13, 3-16, 3-21 and 3-
I
27.
WARNING
To prevent potential fire or shock hazard, do not expose
equipment to rain or moisture.
-hp- Part No. 03465-9,0004
(complete Manual including binder)
-hp- Part No. 03465-90001
(Includes Binder, Cover Inserts - no Pages)
-hp- Part No. 03465-90003
(Loose-Leaf Pages Only)
Microfiche Part No. 03465-90051
Copyright Hewlett-Packard Company 1975
P.O. Box 301, Loveland, Colorado 80537 U.S.A.
Revised: October 1975 Printed: June 1975
HEWLETT i:j PACKARD
CERTIFICATION
Helwett-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.
W'ARRANTY 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, if any, listed in Section I of this operating
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 they are returned to Hewlett-Packard, and provided
the proper preventive maintenance procedures as listed 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.
If this product is sold as part of a Hewlett-Packard integrated instrument
system, the above warranty shall not be applicable, and this product shall be
covered only by the system warranty.
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.
Model 3465A Table of Contents
TABLE OF CONTENTS
Section Page Section Page
I. GENERAL INFORMATIO 1-1 4-35. Display 4-4
1-1. Introduction..................... 1-1 4-37. Power Supply 4-5
1-3. Description 1-1 4-39. Detailed Theory . . . . . . . . . . . . . . . . . . 4-5
1-5. Specifications.................... 1-1 4-41. Precision Resistor Pack (R75) 4-5
1-7. Instrument and Manual Identification 1-1 4-43. Ohms Converter 4-5
1-9. Options 1-1 4-50. AC-to-DC Converter 4-6
1-11 . Option 001 . . . . . . . . . . . . . . . . . . . . 1-1 4-56. A-D Conversion Using a Monopolar
1-13. Option 002 . . . . . . . . . . . . . . . . . . . . 1-1 Reference . . . . . . . . . . . . . . . . . . . . 4-6
1-15. Accessories. . . . . . . . . . . . . . . . . . . . .. 1-1 4-64. Data Accumulator. . . . . . . . . . . . . . . . 4-8
1-17. Safety Considerations. . . . . . . . . . . . . . . 1-1 4-69. Display 4-8
4-72. Power Supply 04-10
Section Page 4-78. + 10 V Series Voltage Regulation .. 4-11/4-12
II. INSTALLATION..................... 2-1 4-80. - 12 V Supply 4-11/4-12
2-1. Introduction..................... 2-1 4-82. Battery Low-Voltage Detection 4-11/4-12
2-3. Initial Inspection. . . . . . . . . . . . . . . . . . 2-1
2-5. Power Requirements . . . . . . . . . . . . . . . 2-1
2-7. Grounding Requirements 2-1
2-10. Environmental Requirements 2-1 Section Page
2-12. Repackaging for Shipment 2-1 V. MAINTENANCE 5-1
2-16. Power Cords and Receptacles 2-2 5-1. Introduction 5-1
5-3. Test Equipment Required 5-1
Section Page 5-5. Performance Tests 5-1
III. OPERATING I STRUCTIO S 3-1 5-6. DC Voltmeter Accuracy Test 5-1
3-1. Introduction 3-1 5-8. DC Ammeter Accuracy Test 5-1
3-3. Front and Rear Panel Features 3-1 5-10. Ohms Accuracy Test 5-2
3-5. Turn-on and Warm-up 3-1 5-12. AC Voltage Accuracy Test 5-2
3-7. Internal Battery Voltage Measurement and 5-14. AC Ammeter Accuracy Test 5-2
Recharging. . . . . . . . . . . . . . . . . . . . 3-1 5-16. AC Normal-Mode Rejection Test 5-5
3-9. Low Battery Voltage Detection. . . . . . . 3-1 5-18. AC Effective Common-Mode
3-11. Overload Indication " 3-1 Rejection Test 5-5
3-13. AC Voltage Measurements 3-1 5-20. DC Voltmeter Input Resistance Test. 5-5
3-14. AC Voltage Ranges 3-1 5-22. AC Voltmeter Input Impedance Test 5-6
3-16. DC Voltage Measurements 3-3 5-24. Adjustment Procedures 5-7
3-17. 10 mV Range Zero Adjust 3-3 5-26. Power Supply Adjustment 5-8
3-19. DC Voltage Ranges 3-3 5-30. Input Amplifier Adjustments 5-8
3-21. Current Measurements 3-3 5-33. Ohms Converter Adjustments
3-23. AC Current Ranges 3-3 (R58 and R69) 5-9
3-25. DC Current Ranges 3-3 5-35. AC - DC Converter Adjustments 5-9
3-27. Ohms Measurements 3-4
3-28. Ohmmeter Ranges 3-4
3-30. Ohmmeter Reference Current 3-4
PERFORMANCE TEST CARDS
Section Page
IV. THEORY OF OPERATION . 4-1 Section Page
4-1. Introduction . 4-1 VI. REPLACEABLE PARTS . 6-1-
4-3. Description . . . . . . . . . . . . 4-1 6-1. Introduction . 6-1
4-6. Simplified Theory . 4-2 6-4. Ordering Information . 6-1
4-8. Signal Conditioning . 4-2 6-6. Non-Listed Parts . 6-1
4-18. Analog-to~Digital (A-D) Converter . 4-3 6-8. Parts Changes . 6-1
4-26. Logic Section . 4-4 6-10. Proprietary Parts . 6-1
iii
Table of Contents Model 3465A
TABLE OF CONTENTS (cont'd)
Section Page Section Page
VII. TROUBLESHOOTI G AND 7-17. Data Accumulator Input/Output
CIRCUIT DIAGRAMS 7-1 Verification 7-2
7-1. Introduction 7-1 7-19. Display and Display Driver
7-3. Schematic Diagrams 7-1 Verification 7-3
7-5. Preliminary Troubleshooting 7-1
7-7. Analog Troubleshooting 7-1 Section Page
7-10. Digital Troubleshooting 7-1 VIII. BACKDATING 8-1
7-13. Polarity, Zero Detect and Clock 8-1. Introduction 8-1
Circuit Verification 7-2 8-3. Change Sequence 8-1
7-15. Analog Switch Lines and Control 8-5. Parts not Included in Backdating 8-1
State Counter Verification 7-2 Appendix A. Electronic Sales and Service Offices
LIST OF TABLES
Table Page Table Page
1-1. Specifications 1-2 5-6. AC Ammeter Accuracy Test, 100 /lA thru
1-2. General Information 1-3 lOrnA Ranges 5-4
3-1. Ohmmeter Current Through Unknown 3-4 5-7. AC Ammeter Accuracy Test, 100 rnA and
4-1. Display Interface Connections. . . . . . . . . . . . . 4-9 1000 rnA Ranges 5-5
5-1. Test Equipment Required 5-0 5-8. Power Supply Jumpers 5-8
5-2. DC Voltmeter Accuracy Test. 5-1 6-1. Standard Abbreviations 6-1
5-3. DC Ammeter Accuracy Test 5-2 6-2. Code List of Manufacturers 6-2
5-4. Ohms Accuracy Test 5-2 6-3. Replaceable Parts List . . . . . . . . . . . . . . . . . . 6-3
5-5. AC Voltage Accuracy Test 5-3 8-1. Manual Backdating Changes. . . . . . . . . . . . . . . 8-1
LIST OF ILLUSTRATIONS
Figure Page Figure Page
2-1. Power Receptacles 2-2 5-2. Ohms Accuracy Test 5-2
3-1. Front and Rear Panel Features 3-2 5-3. AC Ammeter Accuracy Test 100 /lA thru
4-1. Basic Block Diagram and Measurement 10 rnA Range 5-3
Sequence 4-1 5-4. AC ormal-Mode Rejection Test 5-5
4-2. Simplified Diagram, Ohms Converter. 4-2 5-5. AC Effective Common-Mode
4-3. Block Diagram, AC-to-DC Converter 4-3 Rejection Test . . . . . . . . . . . . . . . . . . . . . 5-6
4-4. Block Diagram, Power Supply 4-5 5-6. DC Voltmeter Input Resistance Test 5-6
4-5. Over-Voltage Protection Circuit 4-5 5-7. AC Voltmeter Input Impedance Test. 5-6
4-6. Basic Diagram, AC Converter Amplifier 4-6 5-8. Multimeter Adjustment Location 5-7
4-7. Functional Diagram, A-D Converter. 4-7 7-1. Functional Block Diagram 7-5/7-6
4-8. Data Accumulator. 4-9 7-2. Signal Conditioning 7-7/7-8
4-9. Basic Diagram, DC-to-DC Converter .4-10 7-3. Analog-to-Digital Converter 7-9/7-10
4-10. Simplified Diagram, DC-to-DC Converter .4-10 7-4. Logic and Display 7-11/7-12
5-1. DC Ammeter Accuracy Test 5-1 7-5. Power Supply 7-13/7-14
iv
Model 3465A Section I
SECTIO N I
GENERAL INFORMATION
1-1. INTRODUCTION. derived from an ac source of 86 to 127 V or 172 to 254 V,
48 to 66 Hz. Two NiCad Battery Packs can be installed at
1-2. This section contains general information concerning any time to allow portable operation of the Multimeter.
the -hp- Model 3465A Multimeter. Included is an instru-
ment description, specifications, information about instru- 1-13. Option 002.
ment and manual identification, option and accessory 1-14. Option 002 is powered by four "D" type dry cell
information and safety considerations. batteries (U2 in Europe). Alternate power can be derived
from most Hewlett-Packard hand-held calculator battery
1-3. DESCRIPTION. chargers such as the Model 82002A Battery Charger/AC
Adapter through a special rear panel input connector.
1-4. The -hp- Model 3465A Multimeter is a 4-1/2 digit, five
function digital multimeter. The five functions are dc volts, 1-15. ACCESSORIES.
ac volts, dc current, ac current and ohms. Measurements
can be made to four significant digits with a sample rate of 1-16. The following accessories are available to extend the
2-1/2 readings per second. Throughou t this manual, the use fullness of your Multimeter:
3465A Multimeter will be referred to as Multimeter.
1. Model 11096A RF Probe, 100 kHz to 500 MHz
(down 3 dB at 10 kHz and 700 MHz), for use on the
1-5. SPECIFICATIONS. 10 V and 100 V ranges in the DCV function only.
1-6. Instrument specifications are listed in Table 1-1. These 2. Model 11002A Test leads, dual banana to dual alliga-
specifications are the performance standards or limits tor.
against which the instrument is tested. Any change in the
specifications due to manufacturing, design or traceability 3. Model 11003A test leads, dual banana to probe and
to the U.S. National Bureau of Standards will be covered by alligator.
revised pages to this manual. Additional information
describing the operating characteristics are not specifica- 4. Submodule front handle, -hp- Part o. 5061-2001.
tions but are supplemental information for the user.
5. Handle Kit (Rack), -hp- Part 0.5061-0088.
1-7. INSTRUMENT AND MANUAL IDENTIFICATION.
6. Rack adapter kit (includes 1/2 module filler), -hp-
1-8. Hewlett-Packard uses a two-section serial number. The Part No. 5061-0054.
first section (prefiX) identifies a series of instruments. The
last section (suffix) identifies a particular instrument within 7. Nickel Cadmium Battery Pack (2 reqUired) -hp- Part
the series. If a letter is included with the serial number, it No. 00035-60024.
identifies the country where the instrument was manufac-
tured. This manual is kept up-to-date with the instrument 8. Model 82002A Battery Charger/AC Adapter, alter-
at all times by revision. If the serial prefix of your nate power (battery elimination) for the Option 002
instrument differs from the one on the Ide page of this Multimeter.
manual, refer to Section VIII for backcl.lting information
that will adapt this manual to your instrument. All 9. 11129A Binding Post Kit.
correspondence with Hewlett-Packard should include the
complete serial number.
1-17. SAFETY CONSIDERATIONS.
1-9. OPTIONS. 1-18. This operating and service manual contains cautions
and warnings alerting the user to hazardous operating and
maintenance conditions. This information is flagged by a
1-10. Multimeter options are available to proVide alternate
methods of powering the instrument. The standard instru- caution or warning heading and/or the symbol 6 .The
ment is powered by rechargeable NiCad batteries or can be
& symbol appears on the front panel and is an
international symbol meaning "refer to the Operating and
powered from an ac source of 86 to 127 V or 172 to 254V,
Service Manual". This symbol flags important operating
48 to 66 Hz.
instructions located in Section III. To ensure the safety of
1-11. Option 001. the operating and maintenance personnel and retain the
operating condition of the instrument, these instructions
1-12. Option 001 allows ac line operation only. Power is must be adhered to.
1-1
Section I Model 3465A
Table 1-1. Specifications.
DC VOLTMETER
(
Ra nges: 10mV, 100 m V, 1 V, 10 V, 100 V, 1000 V RANGE SPECIFICATION