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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.

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-

27.

WARNING I

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

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

4-35. Display 4-4

4-37. Power Supply 4-5

4-39. Detailed Theory . . . . . . . . . . . . . . . . . . 4-5

4-41. Precision Resistor Pack (R75)

GENERAL INFORMATIO 1-1

1-1. Introduction..................... 1-1

1-3. Description 1-1

1-5. Specifications.................... 1-1

1-7. Instrument and Manual Identification 1-1

1-9. Options 1-1

1-11 . Option 001 . . . . . . . . . . . . . . . . . . . . 1-1

1-13. Option 002 . . . . . . . . . . . . . . . . . . . . 1-1

1-15. Accessories. . . . . . . . . . . . . . . . . . . . .. 1-1

1-17. Safety Considerations. . . . . . . . . . . . . . . 1-1

4-5

4-43. Ohms Converter

4-5

4-50. AC-to-DC Converter

4-6

4-56. A-D Conversion Using a Monopolar

Reference . . . . . . . . . . . . . . . . . . . . 4-6

Data Accumulator. . . . . . . . . . . . . . . . 4-8

Display 4-8

Power Supply 04-10

+ 10 V Series Voltage Regulation .. 4-11/4-12

- 12 V Supply

4-64.

4-69.

4-72.

4-78.

4-80.

4-82.

Section

Page

II.

INSTALLATION..................... 2-1

2-1. Introduction..................... 2-1

2-3. Initial Inspection. . . . . . . . . . . . . . . . . . 2-1

2-5. Power Requirements . . . . . . . . . . . . . . . 2-1

2-7. Grounding Requirements

4-11/4-12

Battery Low-Voltage Detection

4-11/4-12

2-1

2-10. Environmental Requirements

2-1

Section

Page

2-12. Repackaging for Shipment

2-1

MAINTENANCE

5-1

2-16. Power Cords and Receptacles

2-2

5-1. Introduction

5-1

Section

Page

5-3.

Test Equipment Required

5-1

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

Recharging. . . . . . . . . . . . . . . . . . . . 3-1

3-9. Low Battery Voltage Detection. . . . . . . 3-1

3-11. Overload Indication

5-14. AC Ammeter Accuracy Test

5-2

5-16. AC Normal-Mode Rejection Test

5-5

5-18. AC Effective Common-Mode

Rejection Test

3-1

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

(R58 and R69)

3-23. AC Current Ranges

3-3

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

IV. THEORY OF OPERATION

Page

4-1

4-2

4-3

4-4

Section

VI. REPLACEABLE PARTS

Page

6-1-

6-1

4-1. Introduction

4-3.

Description . . . . . . . . . . .

6-1. Introduction

4-6. Simplified Theory

6-4. Ordering Information

4-8.

Signal Conditioning

6-6. Non-Listed Parts

4-18. Analog-to~Digital (A-D) Converter

6-8. Parts Changes

4-26. Logic Section

6-10. Proprietary Parts

iii

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