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                                                    TM 11-6625-2781-14&P

                TECHNICAL MANUAL

OPERATOR'S ORGANIZATIONAL, DIRECT SUPPORT, AND
     GENERAL SUPPORT MAINTENANCE MANUAL
 INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

                      FOR
        SPECTRUM ANALYZER IP-1 21 6(P)/GR
         (HEWLETT-PACKARD MODEL 141T)
              (NSN 6625-00 424 4370)


    This copy is a reprint which Includes current
    pages from Change 1.



    HEADQUARTERS, DEPARTMENT OF THE ARMY
                                                              JUNE 1977
                                                  WARNNG NOTICE

A SHOCK HAZARD MAY EXIST ON THE FAN HOUSING OR ANY METAL PART COMMON TO IT. IF ANY OF THE
SERIES REGULATORS, THE TERMINAL SWITCH, OR THE FAN MOTOR ITSELF SHOULD SHORT TO TIHE FAN
HOUSING, A SHOCK HAZARD WOULD EXIST. TO ELIMINATE THE POTENTIAL SHOCK HAZARD, IT IS
NECESSARY TO INSTALL A GROUND WIRE FROM THE FAN HOUSING TO THE CHASSIS OF THE INSTRUMENT;
PROCEED AS FOLLOWS:

  a. Solder one end of ground wire to the chassis side of R11, as shown at point A of the figure below.

  b. Install a starred washer and a ground lug 'under existing hardware, as shown at point B.

  c.   Solder other end of ground wire to ground lug.

AFTER INSTALLATION OF THE GROUND WIRE, INSURE THE FAN ASSEMBY HAS GOOD CONTINUITY TO
GROUND.

                                                              Parts required /one each)

                                                                  Wire, black, 18 awg, 8 inches
                                                                  Solder lug
                                                                  External starred washer
                                                                                                             TM 11-6625-2781-14&P
                                                                                                                       C1
CHANGE
                                                                                           HEADQUARTERS
                                                                                      DEPARTMENT OF THE ARIMY
NO. 1                                                                                WASHINGTON, DC, 11 August 1978,
                                   Operator's, Organizational, Direct Support, And
                                         General Support Maintenance Manual
                                   (Including Repair Parts And Special Tools Lists)
                                                            For
                                        SPECTRUM ANALYZER IP- 1216(P)/GR
                                         (HEWLETT-PACKARD MODEL 141T)
                                                (NSN 6625-00-424-4370)
TM 11-6625-2781-14&P, 1 June 1977, is changed as follows:
1. New or changed material is indicated by a vertical bar in the margin of the page.
2. Remove and insert pages as indicated below:

                                          Remove                              Insert
                                          i through 0-2 ..................i through 0-2
                                          6-1 through 6-18............None
                                          B-1.................................B- through B-28
                                          C-l through C-5..............C- through C-4

3. File this change sheet in front of the publication for reference purposes.


By Order of the Secretary of the Army:

                                                                                                 BERNARD W. ROGERS
                                                                                                General, United States Army
Official:                                                                                              Chief of Staff

              J. C. PENNINGTON
      Brigadier General, United States Army
              The Adjutant General

DISTRI BUTION:
   Active Army:
        TSG (1)                                                    Army Dep (1) except
        USAARENBD (1)                                              Fort Carson (5)
        USAINSCOM (2)                                              Fort Gillem (10)
        TRADOC (2)                                                 Fort Huachuca (5)
        DARCOM (1)                                                 Ft Richardson (CERCOM Ofc) (1)
        TECOM (2)                                                  LBAD (10)
        OS Maj Comd (2)                                            SAAD (30)
        USACC (2)                                                  TOAD (14)
        HISA (Ft Monmouth)(33)                                     SHAD (3)
        Armies (I)                                                 Sig See USA Dep (1)
        USASIGS (10)                                               Units org under fol TOE'
        Svc Colleges (1)                                           29-134 (1)
        WSMR (1)                                                   29-136 (1)
        USAERDAA (1)                                               29-207 (2)
        USAERDAW (1)                                               29-610 (2)
        USA Dep (1)
NG. None
USAR None
For explanation of abbreviations used see, AR 310-50
                                                                                              TM 11-6625-2781-14&P

This manual contains copyright material reproduced by permission of the Hewlett-Packard Company.

TECHNICAL MANUAL,                                                                 HEADQTUARTERS
                                                                              DEPARTMIENT OF THE AR MY
}                                                                              WASHINGTON , 1JUNE 1977
NO 11-6625-2781-14&P

                             OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT, AND
                                  GENERAL SUPPORT MAINTENANCE MANUAL
                             (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)
                                                   FOR
                                     SPECTRUM ANALYZER IP- 1216(P)/GR
                                      (HEWLETT-PACKARD MODEL 141T)
                                           (NSN 6625-00-424-4370)

                                                REPORTING OF ERRORS

               You can improve this manual by recommending improvements using DA Form 2028-2 (Test)
       located in the back of the manual. Simply tear out the self-addressed form, fill it out as shown on the
       sample, fold it where shown, and drop it in the mail.

              If there are no blank DA Forms 2028-2 (Test) in the back of your manual, use the standard DA
       Form 2028 (Recommended Changes to Publications and Blank Forms) and forward to the Commander,
       US Army Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-MA-Q, Fort
       Monmouth, New Jersey 07703.

               In either case a reply will be furnished direct to you.


                                                        Change 1 i
                                                                                                TM 11-6625-2781-14&P

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service, and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in his 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 an electrical ground. The instrument
is equipped with a three-conductor ac power cable. The power cable must either be plugged into an approved three-
contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly
connected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of the power cable
meet International Electrotechnical Commissioned (IEC) safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence of flammable gases or fumes. Operation of any 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 cable connected. Under certain
conditions, dangerous voltages may 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, cable 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 of glass fragments (implosion). To prevent CRT
implosion, avoid rough handling or jarring of the instrument. 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 any unauthorized
modification to the instrument. Return the instrument to a Hewlett-Packard Sales and Service Officer for 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 of causing death, are present in this instrument. Use extreme caution when
        handling, testing, and adjusting.

                                                     Change 1 ii
                                                                                                                                                TM 11-6625-2781-14&P

                                                                             TABLE OF CONTENTS
Model 141T

Section                        Title                                        Page               Section Title           Page
0 GENERAL..................................................................... 0-1             V     PERFORMANCE CHECK AND AD-
I   GENERAL INFORMATION........................................... 1-1                               JUSTMENTS................................................................. 5-1
                                                                                                     5-1     Introduction ...................................................... 5-1
     1-1      Introduction ......................................................... 1-1             5-3     Test Equipment................................................. 5-1
     1-4      Description .......................................................... 1-1             5-5     Performance Check ......................................... 5-1
     1-9      Cathode Ray Tube .............................................. 1-1                    5-8     Preliminary Setup ............................................ 5-1
     1-11     Warranty ............................................................. 1-1             5-9     Beam Finder ..................................................... 5-2
     1-13     Associated Equipment ........................................ 1-1                      5-11    Focus and Astig ............................................... 5-2
     1-15     Instrument and Manual Identification .................. 1-3                            5-13    Trace Align.................................................... 5-5-2
     1-19     Inquiries ................................................................. 1    -     5-141-3 Calibrator ......................................................... 5-2
                                                                                                     5-15    Variable Persistence ......................................... 5-2
     II       INSTALLATION.................................................. 2-1                     5-16    Writing Speed, Fast .......................................... 5-2
     2-1      Introduction ........................................................ 2-1              5-17    Store Time, Fast .............................................. 5-3
     2-3      Initial Inspection ................................................. 2-1               5-18    Writing Speed, Standard ....................................53
     2-6      Preparation for Use ............................................ 2-1                   5-19    Store Time, Standard....................................... 5-3
     2-9      Three-conductor Ac Power Cable ..................... 2-2                               5-21    Adjustments .................................................... 5-3
     2-11     Instrument Mounting .......................................... 2-2                     5-24     Preliminary Setup ........................................... 5-3
     2-14     Instrument Cooling ............................................. 2-3                   5-25    Low Voltage Power Supply
     2-17     Claims ......................................................... 2-3/'2-4                      Adjustment ....................................................... 5-3
     2-19     Repacking for Shipment .............................. 2-3/2-4                          5-26     High Voltage Power Supply
                                                                                                             Adjustment ....................................................... 5-3
     III     OPERATION...................................................... 3-1                     5-27    Intensity Limit Adjust ........................................ 5-4
     3-1     Introduction ........................................................ 3-1               5-28    -Geometry-- ..................................................... 5-5
     3-3     Controls and Connectors ................................... 3-1                         5-29    Calibrator Adjustment ...................................... 5-5
     3-5     Trace Align......................................................... 3-1                5-30    Pulse Circuit Adjustments ................................ 5-5
     3-7     Beam Finder ...................................................... 3-1
     3-9     Focus and Astigmatism ..................................... 3-1                         VI        REPILACEABILE PARTS DELETED
     3-11    Z-axis Input ........................................................ 3-1
     3-13    Plug-in Units ...................................................... 3-1                VII    MANUAL CHANGES AND OPTIONS.............. 7-1
     3-19    Operating Considerations .................................. 3-4                         7-1    Introduction ....................................................... 7-1
     3-20    Definitions .......................................................... 3-4              7-3    Manual Changes............................................... 7-1
     3-22    Control Functions............................................... 3-4                    7-5    Special Options................................................. 7-4
     3-30    Operating Procedures ........................................ 3-5                       7-9    Standard Options .............................................. 7-4
     3-32    Single-shot Operation ........................................ 3-6                      7-14. Additional Manual Changes ................................ 7-4

     IV       PRINCIPI,ES OF OPERATION.......................... 4-1                                 VIII      SCHEMATICS AND TROUBLE-
     4-1      Introduction ........................................................ 4-1                        SHOOTING...................................................... 8-1
     4-3      Overall Functional Description ........................... 4-1                         8-1       Introduction ....................................................... 8-1
     4-5      Low-voltage Power Supply................................. 4-1                          8-3       Schematics ....................................................... 8-1
     4-7      Calibrator .......................................................... 4-1              8-8       Reference Designations ................................... 8-1
     4-9      High-voltage Power Supply................................ 4-1                          8-12      Component Locations ...................................... 8-1
     4-11     Pulse Circuit....................................................... 4-2               8-14      Preventive Maintenance .................................. 8-1
     4-13     Horizontal Driver Circuit ..................................... 4-2                    8-15      DELETED.
     4-15     Circuit Description .............................................. 4-2                 8-17      Filter Maintenance ............................................ 8-2
     4-16     Low-voltage Power Supply................................. 4-2                          8-19      Electrical Maintenance...................................... 8-2
     4-24     Calibrator ........................................................... 4-3             8-21      Repair and Replacement ................................. 8-2
     4-28     High-voltage Supply ........................................... 4-3                    8-23      Instrument Repair ............................................. 8-2
     4-34     Storage CRT ...................................................... 4-4                 8-26      CRT Removal and Replacement ...................... 8-2
     4-41l    Pulse Circuit....................................................... 4-4               8-29      Fan Removal and Replacement ...................... 8-2
     4-41      STD and Fast Modes ......................................... 4-4                      8-31      Semiconductor Replacement ........................... 8-2
     1-5,3       Pulse Circuit' Store Mode ............................... 4-6
     4-57        Pulse Circuit: Conventional Mode .................. 4-6
     4-60        Trace Align ............................................... 4-7/4-8
     4-62        Plug-in Kit Fabrication .............................. 4-7/4-8

                                                                                      Change 1 iii
                                                                                                                                                 TM 11-6625-2781-14&P

                                                                             TABLE OF CONTENTS
List of Illustrations

Section                                 Title                                     Page         Section                                 Title                                   Page

     8-33. Servicing Circuit Boards..................................... 8-3                       Group OOSpectrum Analyzer IP-1216(P)/
     8-36. Overall Troubleshooting ..................................... 8-3                                 GR (Hewlett-Packard Model
     8-39. Front Panel Controls .......................................... 8-4                               141T)....................................................... B-9
     8-41. Visual Checks .................................................... 8-4                         01 Circuit Card Assembly, Al ..................... B-13
     8-43.Waveforms and Voltages ..................................... 8-4                                02 Circuit Card Assembly, Power
     8-45. Final Checks ...................................................... 8-4                           Supply, A2............................................. B-17
     8-47 Detailed Troubleshooting ................................... 8-4                                03 Circuit Card Assembly, Pulse, A.5 ........ B-21
     8-48. Low-Voltage Supply ........................................... 8-4                             04 Circuit Card Assembly, Horizon
     8-55. High-Voltage Supply .......................................... 8-6                                tal Drive, A6 .......................................... B-25
     8-60 Pulse Circuit....................................................... 8-6             III           SPECIAL TOOLS LIST (Not applicable)
     APPENDIX A References ............................................. A-1                   IV            NATIONAL STOCK NUMNBER AND
     APPENDIX B Organizational, Direct Sup-                                                                  PART NUMBER INDEX ........................ B-26
                      port, and General Support                                                APPENDIX C    Maintenance Allocation
                      'Maintenance Repair Parts                                                I             INTRODTUCTION .................................. C-1
                      and Special Tools List (In-                                              II            MAINTENANCE ALLOCATION
                      cluding Depot Maintenance                                                              CHART.................................................... C-3
                      Repair Parts and Special                                                 III           TOOL AND TEST EQIUIPMENT
                      Tools)                                                                                 REQUIREMENTS ................................... C-4
I    INTRODUCTION .......................................................... B-1               IV            REMARKS (Not applicable)
II   REPAIR PARTS LIST................................................... B-9

                                                                            LIST OF ILLUSTRATIONS

Figure                                  Title                                     Page         Figure         Title                    Page

     1-1      Model 141T Display Section ..............................                1-0           3-10. Small Bright Spots caused by Minute
     1-2      Instrument Serial Number - ................................              1-3                 Imperfections in Storage Mesh .......................... 3-6
     2-1      Voltage Selection ...............................................        2-1           4-1. Model 141T Block Diagram --- ........................... 4-1
     2-2      Rear Mounting Procedure ..................................               2-2           4-2. Regulated Power Supply- Block
     3-1.     Mode(141T Controls and Connectors ................                       3-2                 Diagram- ............................................................ 4-2
     3-2      Intensity Adjustment ..........................................          3-3           4-3. High-voltage Power Supply Block
     3-3      Background Illumination immediately                                                          Diagram ............................................................. 4-3
              after- erasing with 'RITING SPEED                                                      4-4. Pulse Circuit Block Diagram .............................. 4-5
              in FAST and PERSISTENCE to                                                             4-5. Erase Functional Waveform .............................. 4-6
              MAX S................................................................    3-5           5-1A Spectrum Analyzer Intensity Limit
     3-4      Persistence with a Slow Repetitive                                                           adjust-................................................................ 5-4
               Sweep ...............................................................   3-5           5-1. Adjustment Location ...................................... 5-7/5-8
     3-5      Single-shot Trace Bloom caused by                                                6-1
                                                                                               thru
              INTENSITY and/or PERSISTENCE                                                     6-5 DELETED...........................................................................I
           set too high ........................................................       3-5
     .3-6. Single-shot Display With INTENSITY                                                        7-1A. Effect of Change 11 ...........................................          7-3
           and PERSISTENCE set the same as                                                           7-1. Component Identification Pulse
           figure 3-5 and Increased Amplitude ...................                      3-5                 Circuit A5 ...........................................................   7-5
     3-7. Fade Positive after 2 to 4 minutes                                                         7-2   Pulse Circuit Schematic.....................................             7-5
           in STD mode ......................................................          3-6           7-3   Line Voltage Schematic .....................................             7-6
     3-8   Single-shot 20 usec/div display .........................                   3-6           7-4. Option 009 Schematic Diagram .........................                    7-6
     3-9   Same Display as figure :3-S after                                                         7-5. Pulse Circuit Schematic.....................................              7-7
           three minutes in STD mode ...............................                   3-6           7-6   Line Voltage Schematic .....................................             7-8
           Model 1llT



                                                                                       Change 1 iv
                                                                                                                                           TM 11-6625-2781-14&P

Model 141T

                                                                       LIST OF ILLUUSTRATIONS

Figure                                Title                                     Page        Figure                               Title                                    Page

    8-1        Semiconductor Terminal Identi-                                                    B-1       Spectrum Analyzer IP-1216(P)/GR
               fication ............................................................ 8-3                   (Hewlett-Packard Model 141T)
    8-2        Component Location, Top View ..................... 8-8                                      (Sheet 1 of 5) ................................................. B-4
    8-3        Component Location, Bottom View ................ 8-9                              B-1       Spectrum Analyzer IP-1216(P)/GR
    8-4        Component Location, Front View ................. 8-10                                       (Hewlett-Packard Model 141T)
    8-5        Component Location, Rear View - ............... 8-12                                        (Sheet 2 of 5) ................................................. B-4
    8-6        Plug-in Jack Connections ............................. 8-13                       B-1       Spectrum Analyzer IP-1216(P)/GR
    8-7        Auxiliary A and Auxiliary B Wiring                                                          (Hewlett-Packard Model 141T)
               Diagram........................................................ 8-13                        (Sheet 3 or 5) ................................................. B-6
    8-8        Component Identification, Power                                                   B-1       Spectrum Analyzer IP-1216(P)/GR
               Supply A2 ..................................................... 8-14                        (Hewlett-Packard Model 141T)
    8-9.       Component Identification, Diode                                                             (Sheet 3 or 5) ................................................. B-6
               Assy A1 ........................................................ 8-15             B-1       Spectrum Analyzer IP-1216(P)/GR
    8-10.      Low Voltage Schematic ................................ 8-15                                 (Hewlett-Packard Model 141T)
    8-11.      Component Identification, Power                                                             (Sheet 5 of 5) ................................................. B-8
               Supply A2 ..................................................... 8-16              B-2       Circuit Card Assembly, Diode ...................... B-12
    8-12.      Component Identification, Horizontal                                              B-3       Circuit Card Assembly, Power Supply
               Driver A6 ...................................................... 8-17                       (Sheet 1 of 2) ............................................... B-15
    8-13.      High Voltage Schematic ............................... 8-17                       B-3       Circuit Card Assembly, Power Supply
    8-14.      Component Identification, Pulse                                                             (Sheet 2 of 2) ............................................... B-16
               Circuit A5...................................................... 8-18             B-4       Circuit Card Assembly, Pulse ...................... B-20
    8-15.      Waveforms ................................................... 8-19                B-5       Circuit Card Assembly, Horizontal
    8-16        Pulse Circuit Schematics ............................ 8-19                                 Drive............................................................. B-24

                                                                                 LIST OF TABLES


Table                                 Title                                     Page        Table                                Title                                    Page

    1-1     Specifications..................................................... 1-2             6-1
    1-2.    Reference Designators and Abbre-                                                    thru
            viations- ............................................................. 1-3         6-4     DELETED
    1-3.    Plug-ins for Model 141T Display                                                     7-1     Manual Changes ................................................ 7-1
            Section ................................................................ 1-4    -1- 7-2     DELETED
    4-1.    Current Capability ........................................ 4-7/4-8                 7-3     Option 009, Replaceable Parts ........................... 7-4
    5-1     Recommended Test Equipment ........................ 5-1                             8-1     Troubleshooting High-voltage Supply,
            Performance Check Record............................. 5-4a                                  No Voltage .......................................................... 8-5
    5-2     Low Voltage Power Supply Adjustment ............. 5-4                                8-2.   Troubleshooting Hligh-voltage Supply,
                                                                                                        Incorrect Voltage ............................................... 8-5
                                                                                                 8-3.   Schematic Diagram Notes ................................. 8-7

                                                                                    Change 1 v
                                                               TM 11-6625-2781-14&P
General Information                                                      Model 141T




                                                                        141T-R-14 1

                      Figure 1-1. Model 141T Display Section

                                       1-0
                                                                                              TM 11-6625-2781-14&P

                                                     SECTION 0
                                                     GENERAL

0-1. SCOPE.

     This manual describes Spectrum Analyzer IP-1216(P)/GR (fig. 1-1) and provides instructions for operation and
maintenance. Through- out this manual, the IP-a216(P)/GR is referred to as the Hewlett-Packard Model lh1T.

0-2. INDEXES OF PUBLICATIONS.

     a. DA Pam 310-4. Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions,
changes, or additional publications pertaining to the equipment.

      b. DA Pam 310-7. Refer to DA Pam 310-7 to determine whether there are modification work orders (MWO's)
pertaining to the equipment.

0-3. FORMS AND RECORDS.

     a. Reports of Maintenance and Unsatisfactory Equipment. Maintenance forms, records, and reports which are to
be used by maintenance personnel at all maintenance levels are listed in and prescribed by TM 38-750.

     b. Report of Packaging and Handling Deficiencies. Fill out and forward DD Form 6 (Packaging Improvement
Report) as prescribed in AR700-58/NAVSUPINST 4030.29/AFR 71-13/MCO P4030.29A and DSAR 4145.8.

     c. Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and forward Discrepancy in Shipment Report
(DISREP) (SF 361) as prescribed in AR 55-38/NAVSUPINST 4610.33A/AFR 75-18/MCO P4610.19B and
DSAR 4500.15.

0-4. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).

      EIR's will be prepared using DA Form 2407, Maintenance Request. Instructions for preparing EIR's are provided in
TM 38-750, The Army Maintenance Management System. EIR's should be mailed directly to Commander, US Army
Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-MA,-Q, Fort Monmouth, NJ 07703. A
reply will be furnished directly to you.

                                                   Change 1 0-1
                                                                                              TM 11-6625-2781-14&P

0-5. ADMINISTRATIVE STORAGE.

    Administrative storage of equipment issued to and used by Army activities shall be in accordance with TM 740-90-1.

0-6. DESTRUCTION OF ARMY ELECTRONICS MATERIEL.

    Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.

                                                        0-2
                                                                                                     TM 11-6625-2781-14&P
Model 141T                                                                                              General Information
                                                    SECTION I
                                              GENERARAL INFORMATION

1-1. INTRODUCTION.                                                 20 MHz and sensitivities to 100 microvolts per division
1-2.    This manual provides operating and service                 are available as well as time domain reflectometry and
information for the Hewlett-Packard Model 141T Display             swept frequency indicator units.
Section (figure 1-1). The manual is divided into eight
sections, each covering a specific topic or aspect of the          1-9. CATHODE RAY TUBE.
instrument. All schematics are located at the rear of the          1-10. The Model 141T uses a post-accelerator CRT with
manual and can be unfolded and used for reference                  a non-glare rectangular faceplate. An internal graticule is
while reading any part of the manual.                              located on the same plane as the display to eliminate
                                                                   parallax errors. The tube has a 9-kV accelerating
1-3. This section contains a description of the Model              potential, and 8 vertical by 10 horizontal divisions. A type
141T. The instrument specifications are listed in table 1-         P31 phosphor is used in the standard CRT.
1. Table 1-2 lists and describes the abbreviations used
in this manual except Section VI. The parts list is a                                      CAUTION
computer printout and uses computer supplied
abbreviations. Table 1-3 contains a list of current plug-                  The warranty may be void for
ins available for use with the Model 141T.                                 instruments having a mutilated serial
                                                                           number tag.
1-4. DESCRIPTION.
1-5. The Model 141T is designed for use as a display               1-11. WARRANTY.
section for the HP Model 141T/8550-series plug-in                  1-12. The instrument (except the CRT) is certified and
spectrum analyzer and as an oscilloscope when used                 warranted as stated on the inside front cover of this
with HP Model 1400-series plug-ins. The instrument has             manual. The CRT is covered by a separate warranty.
variable persistence (duration of trace afterglow) and             The CRT warranty and a warranty claim form are located
storage of CRT displays. Persistence is variable from              at the rear of this manual. Should the CRT fail within the
0.2 second to more than 60 seconds. A display can be               time specified on the CRT warranty page, complete the
stored (at reduced intensity) for more than hours or               warranty claim form and return it with the defective CRT.
displayed at normal intensity for up to 1 minute. Stored           The procedure for returning a defective CRT is described
displays can be erased in 350 milliseconds.                        on the CRT warranty page.

1-6. Variable persistence is especially useful for viewing         1-13. ASSOCIATED EQUIPMENT.
slow-sweep signals. The persistence of the signals from            1-14. Plug-ins available for use with the instrument are
electrocardiograms or other bio-chemical phenomena                 listed in table 1-3 and in the Hewlett-Packard
can be adjusted to provide a complete trace, yet to fade           Instrumentation Catalog. The instrument is normally
fast enough to prevent interference with the next trace..          operated with an IF section plug-in in the lower
Display persistence of swept frequency and time domain             compartment and an RF section plug-in in the upper
reflectometry measurement readouts can be adjusted to              compartment. The instrument can also be used as an
eliminate flicker and still provide high resolution.               oscilloscope with a vertical plug-in in the lower
                                                                   compartment and a time-base plug-in in the upper
1-7. The storage feature of the instrument can be used             compartment. Both plug-in compartments are the same
to store single-shot waveforms and to later view or                size, and the plug-in instruments may be interchanged
photograph the phenomena. Comparison of wave forms                 for any special application. The divider shield that
can be accomplished by storing several display                     separates the two compartments can be removed and
separately and then viewing them simultaneously.                   one double sized plug-in installed. Blank plug-in kits,
                                                                   both single and double sized, are available for fabrication
1-8. The instrument accepts all HP Model 1400 series               of special circuits. See table 4-1 for power supply
plug-in units. Amplifiers with bandwidths to                       current limitations.

                                                             1-1
                                                                                                    TM 11-6625-2781-14&P
General Information                                                                                          Model 141T
                                                 Table 1-1. Specifications

PLUG-INS                                                           STORAGE TIME
Accepts Model 8050-series IF and RF Section spectrum               Standard Writing Speed: more than two hours at
analyzer plug-ins without the use of a center divider              reduced brightness (typically four hours). Traces may be
shield                                                             viewed at maximum brightness for more than one
                                                                   minute.
Also, accepts all HP Model 1100-series plug-ins. All
plug-ins operate directly into the horizontal and vertical         Fast Writing Speed. traces may be stored at reduced
deflection plates. Centaur shield may be removed to                brightness for more than 15 minutes (typically 30
provide double-sized compartment for use with a single,            minutes) or stored at maximum brightness for more than
dual axis Model 1400-series unit.                                  15 seconds.

CATHODE-RAY TUBE                                                   Brightness:
Type:                                                              100 foot-lamberts in standard mode.
Post-accelerator storage tube; 9000s V accelerating
potential; aluminized P31 phosphor; etched safety glass            CALIBRATOR
face plate.                                                        Type:
                                                                   Line-frequency rectangular signal, approximately 0.5
Graticule:                                                         usec rise time.
8 x 10 divisions (approx. 7.1 .: 8.9 cm) parallax-free
internal graticule. Subdivisions of 0 2 div per major              Voltage.
division on major horizontal and vertical axes.                    Two outputs. 1 volt and 10 volts peak-to-peak 



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