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3465A


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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
                                                                                                                                     



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