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    O P E R A T I N G   A N D    S E R V I C E   M A N U A L




                                OSCILLOSCOPE
                                                    1707B




                                                  ~-
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                                                  _ -
                                                  -


                                        HEWLETT         PACKARD
                                                                              .
                           O P E R A T I N G A N D SERVICE M A N U A L




                                          MODEL 1707B
                                         OSCILLOSCOPE


4



                                             SERIALS PREFIXED: 1410A


                            Refer to Section VI1 for instruments with the following
                            standard options: 002,007,011,012,015,602,607,611
                            and 631.




                        H EWLETT-PAC K A R D COMPANY/COLO R A D O SPRINGS D I V IS1O N
                 1900 G A R D E N OF T H E GODS R O A D , C O L O R A D O SPRINGS, C O L O R A D O , U.S.A.




Manual Part Number 01707-90916
Microfiche Number 01707-90816

                                                                                                     PRINTED: APRIL 1974
                                       SAFETY SUMMARY
The following general safety precautions must be observed during all phases o f operation, service, and repair
of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of the instrument. Hewlett-
Packard Company assumes no liability for the customer's failure to comply with these requirements.

GROUND THE INSTRUMENT.
To minimize shock hazard, the instrument chassis and cabinet must be connected to a n electrical
ground. The instrument is equipped with a three-conductor ac power cable. The power cable
must either be plugged into a n approved three-contact electrical outlet or used with a three-
contact to two-contact adapter with the grounding wire (green) firmly connected to a n elmtrical
ground (safety ground) at the power outlet. The power jack and mating plug of the-power cable
meet International Electrotechnical Commission (IEC) safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence o f flammable gases or fumes. Operation of a n y
electrical instrument in such an environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUITS.

Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by qualified maintenance personnel. Do not replace components with
power ca ble connected. Under certain conditions, dangerous voltages m a y exist even with the
power cable removed. To avoid injuries, always disconnect power and discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first
aid and resuscitation, is present.

USE CAUTION WHEN EXPOSING OR HANDLING THE CRT.
Breakage of the cathode-ray tube (CRT) causes a high-velocity scattering o f glass fragments
(implosion). To prevent CRT implosion, avoid rough handling or jarring of the instrument.                        I

Handling of the CRT shall be done only by qualified maintenance personnel using approved
safety mask and gloves.


DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform a n y un-
authorized modification to the instrument. Return the instrument to a Hewlett-Packard Sales and Service
Officefor service and repair to ensure that safety features are maintained.


DANGEROUS PROCEDURE WARNINGS.
Warnings, such as the example below, precede potentially dangerous procedures throughout this
manual. Instructions contained in the warnings must be followed.




              Dangerous voltages, capable o f causing death, are present in this instrumezt.
              Use extreme caution when handling, testing, and adjusting.
        Model 1707H




                                                                              TABLE OF CONTENTS



        Section                                                                       Page         Section                                                             Page

        I         GENERAL INFORMATION . . . . . . . . . . . . . . 1-1                                   3.48 .        Sweep Mode ....................    3-5
                                                                                                        3.51 .        Trigger Selection ................ 3-5
                  1.1 .       Introduction . . . . . . . . . . . . . . . . . . . . . . 1-1              3.54 .      Magnetic Interference ............. 3-5
                  1.4 .       Description .......................                      1 .1             3.56 .      Battery Recharge Operation ....... 3-5
                  1.5.            Introduction . . . . . . . . . . . . . . . . . . 1-1                  3.58 .      Preoperational Adjustments ....... 3-5
                  1.7.            Vertical Circuits . . . . . . . . . . . . . . 1-1                     3.59 .        Initial Turn.on .................. 3-5
                  1-1 1 .         Horizontal Circuits . . . . . . . . . . . . 1-1                       3.61 .        Focus a n d Astigmatism Adjust .. 3-6
                  1.17 .      Cathode-ray Tube ................. 1-5                                    3.63.       Operating Procedures ............. 3-6
                  1.20 .      Warranty .........................                       1-5              3.65 .      Operators Performance Check ..... 3-6
                  1.22.       Accessories Furnished ............ 1-5                                    3.67 .      Operating Information ............ 3-7
                  1.24 .      Accessories Available ............. 1-5                                   3.69 .        Auto Versus Norm .............. 3-7
                  1.26 .      Instrument and Manual                                                     3.71 .        Auto Versus Trig ............... 3-7
                                Identification ................... 1-5                                  3.73.         AC Versus DC .................. 3-7
                  1.30.       Inquiries ..........................                     1-5              3.75 .        Mixed Sweep ....................   3-7
                                                                                                        3.77 .        Delayed Sweep .................. 3-7
                                                                                                        3.80 .        Line Sync .......................  3-7
        I1        INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . .           2-1
                                                                                                   IV    PRINC11'1,ES O F OPERATION . . . . . . . . . . . 4-1
                  2.1 .       Introduction ......................                            2-1         4.1 .   Introduction . . . . . . . . . . . . . . . . . . . . . .    4-1
                                                                                                         4.3 .   Block Diagram Discussion . . . . . . . 4-1
                  2.3.        Initial Inspection . . . . . . . . . . . . . . . . . 2-1
                  2.6.        Preparation for Use . . . . . . . . . . . . . . . 2-1                      4.6.        Input Attenuator . . . . . . . . . . . . . . 4-1
                  2.7 .            Power Requirements . . . . . . . . . . 2-1                            48 .
                                                                                                          .          Vertical I'rcamplifier . . . . . . . . . . 4-1
                                                                                                         4- 10.      1)cllay I.ine . . . . . . . . . . . . . . . . . . . .   4-1
                  2-1 1 .         Three-conductor AC Power
                                     Cable . . . . . . . . . . . . . . . . . . . . . . .     2-1         4-12        Vertical Output Amplifier . . . . . 4-1
                                                                                                         4.14 .      Trigger Circuits . . . . . . . . . . . . . . . 4-1
                  2.13 .          DC Plug . . . . . . . . . . . . . . . . . . . . . .        2-2
                                  Battery Installation . . . . . . . . . . . 2-2                        4- 16.       M ai n In t egr a t or . . . . . . . . . . . . . . . 4.1
                  2-15.
                  2.17 .      Claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2        4.21 .       Holdoff and Comparator . . . . . . 4-2
                  2.19.       Repacking for Shipment . . . . . . . . . . 2-2                            4.24 .       I )el ay ed Integra tor . . . . . . . . . . . . 4-2
                                                                                                        4.27 .       `l'iming Sequence . . . . . . . . . . . . . . 4-;3
                                                                                                        4..31 .      Horizontal Mode Assembly . . . . 4-:3
            I11    OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1              `1-;5 .
                                                                                                            3        I. ow Voltage Power Supply . . . . 4-;j
                   3.1 .  Introduction . . . . . . . . . . . . . . . . . . . . . .     3-1              4.41 .       High Voltage Power Supply . . . 4-3
                   3.3 .  Controls and Connectors . . . . . . . . . . 3-1                               4.44 .       Gate Amplifitr . . . . . . . . . . . . . . . . 4-4
                   3.5 .    Beam Finder ....................                           3-1               4.46 .  Detailed Circuit Theory . . . . . . . . . . 4-4
                   3.7 .    Scale Illumination .............. 3-1                                        4.48 .    Input Attenuators . . . . . . . . . . . . . . 4-4
                   3.9.     Trace Align .....................                          3-1               4.53 .    Vertical Preamplifier . . . . . . . . . . . 4-4
                   3.11 .   Calibrator ......................                          3-1               4.79.     Delay Line .....................                         4-6
                   3.13 .   Focus and Astigmatism ......... 3-1                                          4.81 .    Vertical Output Amplifier . . . . . . 4-6
                   3.15 .   Coupling ........................                          3-1              4.86 .     Trigger Circuits . . . . . . . . . . . . . . . . 4-6
                   3.17 .   Display .........................                          3-4               4.104 .   Main Integrator . . . . . . . . . . . . . . . . 4-8
                   3.24.    Trig ............................                          3-4              4-119.     Holdoff and Comparator . . . . . . 4-10
                   3.26 .   B Polarity ......................                          3-4              4.124 .    Delayed Integrator . . . . . . . . . . . . 4-10
                   3.28 .   Sweep Display .................. 3-4                                        4-130.     Horizontal Mode . . . . . . . . . . . . . . 4-11
                   3.30 .   Ext Horiz Input ................. 3-4                                       4.148 .    Gate Assembly ................. 4-13
                   3.32 .   Main Sweep ....................                            3-4              4.156 .    Calibrator .....................                        4-14
                   3.34 .   Mixed Sweep . . . . . . . . . . . . . . . . . . . 3-4                       4.158 .    Horizontal Preamplifier a n d
                   3.36 .   Delayed Sweep .................. 3-4                                                     Output Assemblies ........... 4-14
                   3.38.    Time/Div .......................                           3-4              4.162.     Indicator Drivers .............. 4-14
                   3.40 .   Vernier .........................                          3-4              4.165 .    Low Voltage Power
    J              3.42 .   Trigger Level ................... 3-4                                                    Supply .......................                        4-14
I
                   3.44 .   Trigger Holdoff ................. 3-4                                       4.174.     High Voltage Power
                   3.46 .   Slope ............................                         3.4                           Supply .......................                        4-16
I

                                                                                                                                                                          111
Table of Contents                                                                                                                          Model 1707B

                                                 TABLE OF CONTENTS (Cont'd)

Section                                                        Page       Section                                                                       Page

V    PERFORMANCE: CHECK AND                                                       5.190 .        Delayed Sweep Time
      A1)JUS'I'ME:NTS .......................                     5-1                              Adjustment .................. 5-23
                                                                                 5.195 .         X10 Gain Adjustment .......... 5 2 4
     5.1 .     Introduction ......................                  5-1          5.200 .         Mag Centering Adjustment .... 5 2 4
     5.3 .     Test Equipment . . . . . . . . . . . . . . . . . . . 5-1          5.205 .         Calibrator Adjustment ......... 5-25
     5.5 .     Performance Check . . . . . . . . . . . . . . . 5-1               5.210 .         Ext Horiz Input Compensation . 5-25
     5.8 .     Front-panel Adjustments . . . . . . . . . . 5-1                   5-215.          Ext Horiz Gain Adjust ......... 5-26
     5.10 .    Front-panel Settings . . . . . . . . . . . . . . 5-1              5.220 .         Low-frequency Pulse Response
     5-12.     Performance Tests . . . . . . . . . . . . . . . . 5-1                               Adj ............................ 5.26
     5.13 .        Deflection Factor . . . . . . . . . . . . . 5-1               5.225 .         Input Capacitance a n d Attenuator
     5.18 .        Rise time .....................                  5-2                            Compensation Adjustment . . 5-26
     5.23 .        Handwidth ....................                   5-3          5.230 .         High-frequency Pulse
     5.28 .      A+B Mode ......................                    5-3                            Response Adj ............... 5-27
     5.33 .      Alt Mode .......................                   5-4
     5.38 .      Chop Mode .....................                    5-4   VI     REPI.ACEAH1. E PARTS . . . . . . . . . . . . . . . . . 6-1
     5.43 .      Single Sweep ................... 5 5
     5.48 .      Auto Trig Recovery Time ........ 5-5                            6.1 .        Introduction . . . . . . . . . . . . . . . . . . . . . . 6-1
     5.53 .      Z Axis Sensitivity ............... 5 6                          6.3 .        Ordering Information . . . . . . . . . . . . . 6-1
     5.58 .      Beam Finder ....................                   5-6
     5.63 .      Coupling Switch ................ 5-6
     5.68 .      Input Resistance ................ 5-7                    VI1 MAZNUAI. CHANGES AN!) OP`I'IONS . . . . 7-1
     5.73 .      Common Rejection Ratio
                   (CMRR) ......................                    5-8           7.1 .       Introduction . . . . . . . . . . . . . . . . . . . . . .      7-1
                 Main Sweep Time ............... 5-8                              7.3 .       Manual Changes . . . . . . . . . . . . . . . . . .            7-1
     5-78.
     5.83 .      Delayed Sweep Time ............ 5-9                             7.5 .        Special Options . . . . . . . . . . . . . . . . . . .         7-1
     5.88 .      Delay Time Accuracy .......... 5-10                             7.9 .        Standard Options . . . . . . . . . . . . . . . . .            7-1
     5.93 .      Delay Time Linearity .......... 511
     5.98 .      Delay Jitter ....................                5-12
     5.103 .     Main Triggering ............... 5-13                     VI11 SCHEMATICS ANI) TROUH1.E: .
     5.108 .     Delayed Triggering ............ 5-14                           SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .            8-1
     5-113.      Main Trigger Level Range a n d
                   Polarity ......................                5-15           8.1 .        Introduction . . . . . . . . . . . . . . . . . . . . . .      8-1
     5.118 .     Delayed Trigger Level Range                                     8.3 .        Schematics . . . . . . . . . . . . . . . . . . . . . . .      8-1
                   and Polarity ................. 5-16                           8.8 .        Reference Designations . . . . . . . . . . .                  8-1
     5.123 .     Ext Horizontal Bandwidth .... 5-16                              8-12.        Component I. ocations . . . . . . . . . . . . .               8-1
     5.128 .     Ext Horizontal Deflection                                       8-1.5.       Preventive Maintenance . . . . . . . . . .                    8-1
                   Factor ......................                  5-17           8-17.            Mechanical Inspection . . . . . . . .                     8-1
                                                                                 8.22 .           Switch Maintenance . . . . . . . . . .                    8-2
     5-133.   Calibrator .....................  5-17                             8.27 .       Repair and Replacement . . . . . . . . . .                    8-2
     5.138 . Adjustments .....................  5-19                             8.29 .           CRT Removal and Replace-
     5.142 . Adjust Procedures ................ 5-19                                                 ment . . . . . . . . . . . . . . . . . . . . . . . .   8-2
     5.143 .  Low Voltage Power Supply                                           8-:3 1.          Vertical Amplifier Module
                Adjustment .................. 5-19                                                   Removal and Replacement . .                            8-3
     5.148 .  High Voltage Power Supply                                          8..n .           Delay l i n e Removal and
                Adjustment .................. 5-19                                                   Replacement . . . . . . . . . . . . . . . .            8-3
     5.153 .  Intensity Limit Adjustment .... 5-20                               8..35 .          Attenuator Removal and
     5.157 .  Y-Axis Alignment .............. 5 2 0                                                  Replacement . . . . . . . . . . . . . . . .            8-3
     5.162 .  Gate Amplifier Response                                            8437.            Removal and Replacement of
                Adjustment .................. 5-20                                                  Assemblies in Horizontal
     5.167 .  Trigger Amplifier Balance a n d                                                       Amplifier Module . . . . . . . . . . .                  8-5
                DC Adjustment ............. 5-21                                 8.42 .           Power S u p p 1y Mod u 1e
              Trigger Sensitivity ............. 5-21                                                 Removal and Replacement                                8-5
     5.172 .                                                                     8.44 .           Power Supply Module IXs-
     5.177 .  Position Centering Adjustment . 5-22                                                  assembly and Reassembly . .                             8-5
     5.181 .  Sweep Length Adjustment ..... 5-22
                                                                                8.46 .            Semiconductor Removal and
     5-185.   Main Sweep Timing                                                                     Replacement . . . . . . . . . . . . . . . .             8-6
                Adjustment .................. 5 2 3                             8.48 .            At t e n u a t or Servi c i n g . . . . . . . . . .       8-6


iv
    Model 1707B                                                                                                                                      Table of Contents
                                                                                                                                                    List of Illustrations
                                                                      TABLE OF CONTENTS (Cont'd)

)   Section                                                                                Page    Section                                                                 Page

            8.50 .      Circuit Hoards ..................... 8-6                                            8.62 .      Soldering Tool. Solder. and
            8.52 .          Hoard Connect ions . . . . . . . . . . . . . 8-6                                              Aids . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
            8.54 .          Servicing Etched Circuit                                                        8.64 .      Heat Sink Removal . . . . . . . . . . . . 8.8
                               Hoards . . . . . . . . . . . . . . . . . . . . . . . 8.6                     8.66 .   Troubleshooting . . . . . . . . . . . . . . . . . . . 8.8
                                                                                                            8.69 .      DC Voltages . . . . . . . . . . . . . . . . . . .        8.8
            8.56 .              Integrated Circuit Replace-                                                 8-71.       Waveforms .................... 8.8
                                  ment . . . . . . . . . . . . . . . . . . . . . . . . .     8.6            8.73 .      Test Points .................... 8.8
            8.60 .              Service Kit .....................                            8.7            8.75 .      Circuit Checking . . . . . . . . . . . . . . .8.9


                                                                            LIST OF ILLUSTRATIONS

    Figure                                 Title                                           Page    Figure                            Title                                 Page

    1.1 .      Model 1707R Oscilloscope . . . . . . . . . . . . . . . 1-0                          5.12 .      Main Triggering Test Setup ............ 5.13
                                                                                                   5.13 .      Delayed Triggering Test Setup ......... 5.14
    1.2 .      Instrument Serial Number                           ............               1-5
                                                                                                   5.14 .      Main Trigger Level Range a n d Polarity
     1.3.       Service Kit for H P 1700-series                                                                  Test Setup ...........................  5.15
                  Oscilloscopes .......................                                      1-6
                                                                                                   5.15 .      Delayed Trigger Level Range a n d
    2.1 .      Rear Panel Power Module . . . . . . . . . . . . . . . 2-1                                         Polarity Test Setup ................ 5-16
    2.2 .      Battery Pack Installation . . . . . . . . . . . . . . . 2-2                         5-16.       EXT Horizontal Bandwidth
                                                                                                                Test Setup ...........................  5.17
    3.1 .      Controls and Connectors . . . . . . . . . . . . . . . . 3-2
                                                                                                   5 1 7.      EXT Horizontal Deflection Factor
    3.2 .      Sweep Combinations .................... 3-5
1   3.3 .      DC BAL Adjust .........................                             3-8                          Test Setup ...........................  5.17
    3.4 .      CALAdjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9             518.        Calibrator Test Setup .................. 5.18
    3.5 .      Algebraic Addition and Differential                                                 5-19.       Adjustment ..........................    529
                 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .          3-10   6-1.        Knob Locator ...........................   6-2
    3.6 .      Delayed Sweep .........................                                      3-11   6-2.        Mechanical Parts Locator ............... 6-3
    3.7 .      Mixed Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . .            3-12
                                                                                                   8.1 .       Vertical Module Mechanical Parts
                                                                                                                 Removal .............................. 8-4
    4.1 .      Timing Sequence ........................                                      4-2   8.2 .       Attenuator Removal ....................               8-4
    4.2 .      Step-by-step operation of the                                                       8.3 .       Semiconductor Terminal Identification . . 8-7
                 Gate Schmitt Trigger ...............                                       4-7    8.4 .       Component Identification. Interior Front
                                                                                                                 and rear Panel .....................               8-23
    4.3 .      Step-by-step operation of the Set-                                                  8.5 .       Component and Assembly Locations . 8-23
                 reset Multivibrator . . . . . . . . . . . . . . . . . . 4-9                       8.6 .       Vertical Module A5 Component
    4.4 .      Blanking Sequence ................... 4-12                                                        Identification ......................              8-24
                                                                                                   8.7 .       Horizontal Module A6 Component
    5.1 .      Deflection Factor Test Setup . . . . . . . . . . . . 5-2                                          Identification ......................              8-24
    5-2.       Rise time Test Setup ....................              5-3                          8-8.        Main Block Diagram ................. 8-25
    5.3 .      Bandwidth Test Setup . . . . . . . . . . . . . . . . . 3 3                          8-9.        Power Supply Block Diagram ........ 8-27
                                                                                                   8-10.       Attenuator Component Identification . 8-28
    5-4.       A+B Mode Test Setup .................. 5-4                                                      Attenuator Schematic . . . . . . . . . . . . . . . . 8-29
                                                                                                   8.11 .
    5 5.       Input Resistance Test Setup ............. 5-7                                       8.12 .      Vertical Preamplifier Assembly A5A4
    5-6.       CMRR Test Setup .......................                5-8                                        Component Identification .......... 8 3 0
               Main Sweep Time Test Setup ............ 5-8                                         8.13 .      Vertical Preamplifier Assembly
    5-7.                                                                                                         A5A4 ..............................                8-31
    5 8.       Delayed Sweep Time Test Setup ........ 5.10
                                                                                                   8-14 .      Vertical Preamplifier Assembly
    5 9.       Delay Time Accuracy Test Setup ....... 5.10                                                      A5A4 ................................                        8.33
    5-10.      Delay Time Linearity Test Setup ....... 5.11                                        8-15.       Vertical Preamplifier Assembly A5A4
    5-11.      Delay Jitter Test Setup ................. 5.12                                                   Component Identification ............ 8.34

                                                                                                                                                                                 V
List of Illustrations                                                                                                                                             Model 1707B
List of Tables
                                                                LIST OF ILLUSTRATIONS (Cont`d)

 Figure                                  Title                                           Page    Figure                                Title                                   Page

8.16 .    Vertical Preamplifier A5A4 a n d Vertical                                               8.32 .      Horizontal Mode Assembly A6A8
           Output Amplifier A5A5 .............. 8.35                                                           Component Identification ............ 8.52
                                                                                                  8.33 .      EXT Horizontal Amplifier Assembly A8.
8.17 .    Vertical Preamplifier A5A4 ............ 8.37                                                         Component Identification ............ 8.52
8.18 .    Trigger Assembly A6A2 Com-                                                              8-34   .    Horizontal Mode Assembly A6A8 ...... 8.53
            ponent Identification ................. 8.38                                          8.35 .      Horizontal Preamplifier Assembly A6A9
          Trigger Assembly A6A2 ................ 8.39                                                          Component Identification ............ 8.54
8.19 .
8.20 .    Trigger Assembly A6A2 ................ 8.41                                            8-36.        Horizontal Output Amplifier Assembly
8-21.     Horizontal Mother Board A6A1                                                                         A6A10 Component Identification ..... 8.54
            Component Identification ............ 8-42                                           8.37 .       Horizontal Preamplifier a n d Output
8.22 .    Main Integrator A6A3                                                                                 Assemblies A6A9 a n d A6A10 ........ 8.55
            Component Identification ............ 8.42                                           8.38 .       Gate Assembly A4 Component
8.23 .    Main Integrator A6A3 ................. 8.43                                                          Identification ........................ 8.56
8.24 .    Main Sweep Time Assembly A6A5                                                          8.39 .      Gate Assembly A4 ...................                               a57
            Component Identification ............ 8.44                                           8.40 .      High Voltage Oscillator A3A4
                                                                                                               Component Identification ..........                             8-58
8.25 .    Main Sweep Time Assembly A6A5                                       ..... 8.45         8.41 .      High Voltage Oscillator A3A4 ........                             8-59
                                                                                                 8.42 .      Line Rectifier A2 Component
 8.26 .    Delayed Integrator A6A4 Component                                                                   Identification ......................                           a60
            Identification ........................                                       8.46   8.43 .      Low Voltage Mother Board A3A1
                                                                                                               Component Identification ..........                             8-60
 8.27 .   Delayed Integrator A6A4 ............... 8.47                                           8.44 .      Power Input and Line Filters .........                            8-61
                                                                                                 8.45 .      Low Voltage Converter Assembly
 8-28.    Delayed Sweep Time Assembly A6A6                                                                     A3A2 Component Identification ....                              a62
           Component Identification ............ 8.48                                            8.46 .      Low Voltage Converter Assembly
 8.29 .   Delayed Sweep Time Assembly                                                                          A3A2 ..............................                             8-63
                                                                                                 8.47 .      Line Rectifier a n d Filter A3A3
           A6A6 ................................                                         8-49                  Component Identification ..........                             864
 8.30 .   Holdoff a n d Comparator A6A7                                                          8.48 .      Line Rectifier a n d Filter A3A3 .......                          a65
           Component Identification ............ 8.50                                            8.49 .      Horizontal Mother Board A6A1 ......                               8-67
                                                                                                 8.50 .      Horizontal Preamplifier A6A9
8.31 .    Holdoff a n d Comparator A6A7                                ......... 8-51                          Voltage Distribution ...............                            868


                                                                                    LIST OF TABLES
Table                                   Title                                            Page    Table                                Title                                    Page

 1.1 .    Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2               6.2 .       Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .     6-5
 1.2 .    Model 1707H Accessories Available . . 1-5/14?                                          6.3 .       List of Manufacturers' Code ..........                             6-25

 5.1 .    Recommended Test Equipment . . . . . . . . . . 5-0                                     7.1 .       Model 1707H Standard Options . . . . . . . . . . 7-2
 5.2 .    Ileflection Factor Accuracy . . . . . . . . . . . . . . 5-2
 5.3.     Main Sweep Performance Check . . . . . . . . 5-9
                                                                                                 8.1 .       Etched Circuit Soldering Equipment . . . . . 8-8
 5.4 .    Delayed Sweep Performance Check . . . . 5-11                                           8.2 .       Model 1707H Assembly Locations . . . . . . . 8-9
             Performance Check Record . . . . . . . . . 5.18a
 5.5 .    Power Supply Voltage Limits . . . . . . . . . . `5-19                                  8.3 .       Schematic Notes . . . . . . . . . . . . . . . . . . . . . . .      8-10
 5.6 .    Main Sweep Time Adjustments . . . . . . . . . 5-23                                     8.4 .       Troubleshooting Low Voltage
 5.7 .    Ilelayed Sweep Time Adjustments . . . . . . 5-24                                                     Power Supply ......................                             8-11
 5.8 .    Square-wave Adjustment ............. 5-27
 5.9 .    Capacitance Adjustment ............. 5-27                                              8.5 .       Troubleshooting High Voltage Power
                                                                                                               Supply. CRT. Gate . . . . . . . . . . . . . . . . .             8-13
 6.1 .     Abbreviations for Replaceable Parts                                                   8.6 .       Troubleshooting Vertical
            List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     6-1                 Deflection ..........................                           8-16


 vi
    Model 1707B                                                                                                       List of Tables

                                                    LIST OF TABLES (Cont'd)

    Table                     Title                           Page     Table                      Title                           Page

    8-7.    Troubles hooting Horizontal . . . . . . . . . .    8- 19   8-18.   Schematic 12 Measurement Con-
    8-8.    Troubleshooting Time Base . . . . . . . . . .      8-20              ditions and Waveforms.. . . . . . . . . . . . 8-46
    8-9.    Block Diagram Measurement                                  8-19.   Schematic 13 Measurement Con-
              Conditions ..........................           .8-24              ditions.. ...........................          8-48
    8-10.   Schematic 4 Measurement Con-                               8-20.   Schematic 14 Measurement Con-
              ditions and Waveforms.. . . . . . . . . . . .    8-31              ditions and Waveforms.. . . . . . . . . . . . 8-50
    8-11.   Schematic 5 Measurement Con-
              ditions and Waveforms.. . . . . . . . . . . .    8-32    8-21.   Schematic 15 Measurement Con-
    8-12.   Schematic 6 Measurement Con-                                         ditions and Waveforms. . . . . . . . . . . . . 8-52
              ditions and Waveforms.. . . . . . . . . . . .    83-34   8-22.   Schematic 16 Measurement Con-
    8-13.   Schematic 7 Measurement Con-                                         ditions and Waveforms.. . . . . . . . . . . .    8-54
              ditions and Waveforms.. . . . . . . . . . . .    8-36    8-23.   Schematic 17 Measurement Con-
    8-14.   Schematic 8 Measurement Con-                                         ditions and Waveforms. . . . . . . . . . . . .    8-56
              ditions and Waveforms.. . . . . . . . . . . .    8-38
                                                                       8-24.   Schematic 18 Measurement Con-
    8-15.   Schematic 9 Measurement Con-                                         ditions and Waveforms. . . . . . . . . . . . .   8-58
              ditions and Waveforms.. . . . . . . . . . . .    8-40
    8-16.   Schematic 10 Measurement Con-                              8-25.   Schematic 19 Measurement Con-
              ditions and Waveforms.. . . . . . . . . . . .    843               ditions.. ...........................             8-60
    8-17.   Schematic 11 Measurement Con-                              8-26.   Schematic 20 Measurement Con-
              ditions.. ...........................            8-44              ditions and Waveforms.. . . . . . . . . . . .     8-62




                                                                                                                                   vii

i
Gcncral Information                                            Model 1707B




                                                            1707-PO01
                      <.*   -"


                      Figure 1-1.Model 1707B Oscilloscope




 1-0
        Model 1707B                                                                                General Information

    1
I
h




                                                           SECTION I

                                                   GENERAL INFORMATION


        1-1.    INTRODUCTION.                                      1-10. With the dual-trace feature, displays can be
                                                                  obtained on either channel A or B, channels A
                                                                  and B together, channels A + B, a n d channels A
        1-2. This manual provides operating a n d service         - B. Simultaneous display of two signals is possible
        information for the Hewlett-Packard Model 1707B           in either chop or alternate mode of operation. During
i                                This manual is divided into
        Oscilloscope (figure 1-1).                                chop operation, channels are switched at a n approxi-
        eight sections, each covering a specific topic or         mate rate of 400-kHz during each sweep. I n the
        aspect of the instrument. All schematics are located      alternate mode of operation, the signal applied to
        at the rear of the manual. Also located at the rear of    each channel is displayed on alternate sweeps.
        the manual are instruction cards located in an            Triggering is selectable from either A ONLY TRIG
        envelope attached to the inside back cover. These         or NORM TRIG position. I n the NORM TRIG position,
        cards explain the function of each instrument control.    the instrument triggers on the displayed signal.
        The card is designed to fit the inside lid of the front   I n the A ONLY TRIG position, the instrument
        panel storage cover.                                      triggers on the signal applied to channel A.
        1-3. This section contains a description of Model
                                                                  1-11. HORIZONTAL CIRCUITS.
        1707B. Instrument specifications are listed in table
        1-1. Table 7-2 lists the options available for Model
        1707B.                                                    1-12. The horizontal circuits provide four types of
                                                                  sweep displays. The displays are main sweep, mixed
                                                                  sweep, delayed sweep and external horizontal input.
        1-4.   DESCRl PTION.

        1-5.   INTRODUCTION.                                      1-13. Operation of the delayed sweep while in the
                                                                  main sweep mode provides trace intensification.
                                                                  The amount of intensification width depends on the
        1-6. The Model 1707B is a general-purpose, wide-
                                                                  delayed front panel settings. In the delayed mode,
        band oscilloscope designed for bench or field service.
                                                                  the intensified portion is displayed across the entire
        The Model 1707B operates from a n ac line, dc line
                                                                  CRT.
        or optional battery pack. The optional ,rechargable
        nickel cadmium batteries provide up to 4% hours of
        operation and require a recharge time of approxi-          1-14. Sweep speed settings from 0.1 usec/div to
                                                                   2 sec/div (main sweep) and 0.1 usec/div to
        mately 14 hours. A carrying handle provides ease
        of transportation and is adjustable, allowing the         0.2 sec/div (delayed sweep) are available in a 1, 2, 5
        Model 1707B to be placed a t a n angle for viewing        sequence. Vernier controls allow continuous adjust-
                                                                  ment between steps and extend the slowest sweep
        the CRT.
                                                                  to 5 sec/div (main sweep) and 0.5 sec/div (delaved
                                                                                                                >   I




i                                                                 sweep). Using the magnifier function, the fastest
        1-7. VERTICAL CIRCUITS.                                   sweep speed can be expanded to 10 ns/div. The
                                                                  mixed sweep function provides for simultaneous
        1-8. Vertical bandwidth is 75 MHz with a rise time        display of a n input waveform and a n expanded
        less t h a n 4.7 ns. Maximum vertical deflection factor   portion of the waveform. The delayed circuits are
        is 10 mV/div. The Model 1707B contains two identical      calibrated, permitting accurate time difference meas-
        vertical amplifiers for single or dual channel            urements to be made.
        operation. Each channel offers a choice of ac or
        dc coupling. Common mode rejection is at least .40        1-15. The main a n d delayed trigger circuits have
        dB a t 10 mV/div, and 20 dB for the rest of the           provisions for either internal or external operation.
        deflection ranges.                                        Choice of trigger coupling is provided; ac/dc, high
                                                                  frequency reject, a n d low frequency reject. The
        1-9. Nine calibrated switch settings provide a            delayed trigger circuit does not have low frequency
        deflection factor range from 10 mV/div to 5 V/div in      reject trigger coupling.
        a 1, 2, 5 sequence. The vertical verniers permit
        continuous adjustment between calibrated steps and        1-16. An external horizontal input allows the use of
        extend the least sensitive deflection factor (5 V/        a n external signal to drive the horizontal deflection
        div) to at least 12.5 V/div.                              plates of the CRT.


                                                                                                                        1-1
General Information                                                                                  Model 1707B
                                             Table 1-1.Specifications



 IERTICAL AMPLIFIERS                                          Common Mode (A        - B)
                                                                FREQUENCY: dc to 1 MHz.
  MODES OF OPERATION: channel A; channel B;                     REJECTION RATIO: at least 40 dB on 10
      channels A and B displayed alternately on                  mV/div; at least 20 d B on all other ranges
      successive sweeps (alt); channels A a n d B                with verniers set for optimum rejection.
      displayed by switching between channels                    Common-mode signal amplitude equivalent
      a t approximately 400-kHz rate with blanking               to 30 div.
      during switching (chop); channel A + channel
      B (algebraic addition).                               TR I G GE RI NG
  EACH CHANNEL (2)                                            Normal Trigger: on displayed signal.
                                                              A only trigger: on signal from channel A.
      Bandwidth:  (Direct or with Model 10006B
        probe, 3-dB down from 50-kHz, 6-div ref-
        erence signal from terminated 5@ohm
        source.)                                          MAIN TIME BASE

        DC-COUPLED: dc to 75 MHz.                           SWEEP
        AC-COUPLED: lower limit is approxima-
          tely 10 Hz.                                         Ranges: from 0.1 usec/div      to 2 sec/div (23
      Risetime: <4.7 ns direct or with Model 10006B             ranges) in 1, 2, 5 sequence; *3% accuracy
        probe, 10% to 90% points with 6 div input               with vernier in calibrated position.
        step from terminated 50-ohm source.
                                                              Vernier:  continuously variable between all
  DEFLECTION FACTOR
                                                                ranges, extends slowest sweep to at least
                                                                5 sec/div; vernier uncalibrated light in-
      Ranges: from 10 mV/div to 5 V/div (9 ranges)              dicates when vernier is not i n CAL position.
        in 1, 2, 5 sequence; *3% accuracy with                Magnifier: expands all sweep by factor of 10
        vernier in calibrated position.                         and extends fastest sweep to 10 ns/div;
      Vernier: continuously variable between all                accuracy *5% (including 3% accuracy of
        ranges, extends maximum deflection factor               time base).
        to at least 12.5 V/div.

      Polarity: NORM or INVT selectable on chan-            SWEEP MODE
        nel B.
      Signal Delay: input signals are delayed suf-            Normal: sweep        is triggered by internal or
        ficiently to view leading edge of input                 external signal.
        signals without advanced external trigger.
      Input R C 1 megohm *2%, shunted by approxi-             Automatic: bright baseline displayed in absence
        mately 24 pF.                                           of input signal; triggering is same as normal
      Input Coupling: AC, DC or GND selectable.                 above 40 Hz.
        GND position disconnects signal input a n d           Single: in normal mode, sweep occurs once
        grounds amplifier input.                                with same triggering as normal; reset push-
                                                                button arms sweep a n d lights indicator; in
  MAXIMUM INPUT                                                 auto mode, sweep occurs once each time
                                                                RESET pushbutton is pressed.
      AC-coupled: *600V (dc + pk ac); rms a c <350V,
       5 V/div to 20 mV/div; <150V at 10 mV/div             TRIGGER1 NG
       (10 kHz or less).
      DC-coupled: <350V (rms) 5 V/div t o 20 mV/div;          Internal: dc to 35 MHz on signals causing 0.5
       <150V at 10 mV/div (10 kHz or less).                     div or more vertical deflection, increasing t o
                                                                1 div at 75 MHz in all display modes except
  A + B OPERATION                                               chop; dc to 400 kHz in chop mode.
                                                              External: dc to 35 MHz on signals 50 mV p-p
      Amplifier: bandwidth a n d deflection factors             or more, increasing to 100 mV p-p a t 75 MHz.
        are unchanged; channel B may be inverted              External Input RC: approximately 1 megohm
        for A - B operation.                                    shunted by approximately 27 pF.



1-2
Model 1707B                                                                                General Information
                                      Table 1-1.Specifications (Cont'd)

    Level and Slope                                         Coupling: selectable, AC, DC, or H F REJ. AC
                                                              attenuates signals below approximately 20
        INTERNAL at a n y point on vertical wave-             Hz. H F REJ attenuates signals above approxi-
          form displayed.                                     mately 30 kHz.
        EXTERNAL continuously variable from
          +12V to -1.2V on either slope of trigger        DELAY (Before start of delayed sweep.)
          signal. Maximum input, *lOOV.
                                                            Time: continuously variable from 0.1 usec to
      Coupling: AC, DC, L F REJ, or H F REJ.                  2 sec.
                                                            Time   Jitter: <0.005% (1 part in 20,000) of
       AC: attenuates signals below approximately            maximum delay in each sweep.
         20 Hz.                                                                           linearity, *O.Wo.
                                                            Calibrated delay Accuracy: fl%;
       LF REJ: attenuates signals below approxi-
         mately 15 kHz.                                   MIXED SWEEP
       H F REJ: attenuates signals above approxi-
         mately 30 kHz.                                       Combines main a n d delayed sweeps into
                                                              one display. Sweep is started by main time
    TRIGGER     HOLDOFF: time    between sweeps               base and is completed by faster delayed
     continuously variable.                                   time base.

                                                        EXTERNAL HORIZONTAL INPUT
DELAYED TIME BASE
                                                         BANDWIDTH: dc to 1 MHz.
  TRACE INTENSIFICATION: intensifies that part            COUPLl NG: dc.
   of main time base to be expanded to full               DEFLECTION FACTOR: X1; 1 V/div.
   screen in delayed time base mode. Rotating               X10; 0.1 V/div.
   time base switch from O F F position activates         VERNIER:      1O:l vernier provides continuous
   intensified mode.                                        adjustment between ranges.
                                                          DYNAMIC RANGE: beam may be positioned to
  SWEEP                                                     left edge of CRT with 0 to -5V input.
                                                          MAXIMUM INPUT *lOOV.
   Ranges: 0.1 usec/div to 0.2 sec/div (20 ranges)        INPUT RC: 1 megohm shunted by approximately
    in 1, 2, 5 sequence; *3% with vernier in cali-          30 pF.
    brated position.
   Vernier: continuously variable between all           CATHODE-RAY TUBE AND CONTROLS
     ranges, extends slowest sweep to 0.5 sec/div.
   Magnifier: expands all sweeps by a factor of          TYPE:    post-accelerator, 22.2-kV accelerating
     10 and extends fastest sweep to 10 ns/div;            potential; aluminized P31 phosphor (other
     accuracy *5% (including 3% accuracy of                phosphors available, refer to options).
    time base).
                                                         GRATICULE: 6 X 10 div internal graticule; each
  SWEEP MODE                                               major division consists of 5 subdivisions on
                                                           major axes; 1 div = 1 cm.
   Trigger: delayed sweep is armed at end of
     delay period.                                       TRACE ALIGN: aligns trace with horizontal grati-
   Auto: delayed sweep is automatically triggered          cule line.
     a t end of delay period.
                                                         BEAM FINDER: returns trace to CRT regardless
 TRIGGERING                                                of settings of vertical, horizontal, or intensity
                                                           controls.
   Internal: same as main time base.
   External: same as main time base. Input RC            INTENSITY MODULATION: +4V, dc to 1 MHz,
     is approximately 1 megohm        shunted by           blanks trace of any intensity. Input R equals
     approximately 27 pF.                                  1000 ohms *lo%.
                                                           Maximum Input: lOV (dc plus pk ac).
   Level and Slope
                                                       GENERAL
     INTERNAL at any point on vertical w a v e
       form displayed.                                   CALIBRAT0 R
     EXTERNAL continuously variable from
       +1.2V to -1.2V on either slope of trigger           Type: 1 kHz *lo% square wave.
       signal.                                             Voltage: 1V p p *l%.



                                                                                                           1-3
General Information                                                                                             Model 1707B
                                              Table 1-1.Specifications (Cont'd)


                                                                        NOTE:
                                                                         DIMENSIONS I N INCHES AND (MILLIMETERS)




                                           TOP




                            1
                            -
                            1         14 3/8(365.1)   1-
                                 MAX PROJECTION (1701A)
                                      15 5/16(388.9)

                                 MAX PROJECTION (1701A)
                                      15 9/16(395.31
                                                                  c




              c


              3 1/8
              (79.4)
                       7
                                   20 7/8 (530.2)

                                         15 3/4 (400.1)    -  c

                                                                                -a
                                                                                 b--11
                                                                                          13 3/8(339.7)
                                                                                            15/64(286.1)   -
                                                                                                           4

                                                                      7 21/64
                                                                      (186.1)
                                                                  7 53/64   I
                                                                  (198.0)


                                                            ID

   POWER REQUIREMENTS                                                 WEIGHT

                                                                        Without Panel Cover: net, 24 lb (11 kg); ship-
       AC Line: 115V or 230V *20%, 48 to 440 Hz.                            ping, 35 lb (15.9 kg).

                                                                        With Panel Cover and Accessories: net, 27 lb
       D C Line: 11.5V to 36V.                                              (12.3 kg); shipping, 38 lb (17.2 kg).

                                                                        With Panel Cover, Accessories, and Battery
       Battery (optional)                                                Pack: net, 35 lb (16 kg); shipping, 46 lb
                                                                            (20.9 kg).
         OPERATING TIME: up to 4.5 hours.                             DI MENS1ONS: refer to outline drawing.
        RECHARGE TIME: 14 hr minimum charging                         ENVIRONMENT (Oscilloscope operates within
         time for a fully discharged battery.                          specifications over following ranges):
        LOW BATTERY INDICATOR: power light
                                                                        temperature 0



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