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120_cal


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                                      *TB 9-6625-082-50
       DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
       CALIBRATION PROCEDURE FOR
     OSCILLOSCOPE, HEWLETT-PACKARD
     MODELS 120A, 120AR, 120B. AND 120BR
                      Headquarters, Department of the Army, Washington, DC
                                        14 January 1974

                                 REPORTING OF ERRORS           
         You can help improve this publication by calling attention to errors and by
         recommending improvements and stating your reasons for the recommendations.
         Your letter or DA Form 2028, Recommended Changes to Publications, should be
         mailed directly to Commander, U.S. Army Aviation and Missile Command,
         ATTN: AMSAM-TMD-EP, Redstone Arsenal, AL 35898-5000. FAX to DSN 788-
         2313 (commercial 256-842-2313). A reply will be furnished directly to you.

                                                                                                       Paragraph   Page
 SECTION              I.     IDENTIFICATION AND DESCRIPTION
                             Test instrument identification..............................                  1        2
                             Calibration data card, DA Form 2416 ..................                        2        2
                             Calibration description .........................................             3        3
                     II.     EQUIPMENT REQUIREMENTS
                             Equipment required..............................................              4        4
                             Accessories required .............................................            5        5
                    III.     PRELIMINARY OPERATIONS
                             Preliminary instructions.......................................               6        5
                             Equipment Setup ..................................................            7        6
                     IV.       CALIBRATION PROCESS FOR MODELS
                               120A AND 120 AR
                               Intensity limit ....................................................       8         6
                               Vertical and horizontal amplifier dc balance.....                          9         7
                               Triggering range and level.................................                10        9
                               Vertical and horizontal sensitivity and range ...                          11        12
                               Calibrator...........................................................      12        13
                               Vertical amplifier frequency response and
                               attenuator compensation ...................................                13        13
                               Horizontal amplifier frequency response and
                               attenuator compensation ...................................                14        14
                               Amplifier phase shift..........................................            15        16



__________
    This bulletin supersedes TB 9-6625-082-50, 17 September 1970.
TB 9-6625-082-50

                                                                                               Paragraph   Page
                       Sweep timing......................................................          16       16
                       Sweep magnifier.................................................            17       17
                       Power supply......................................................          18       18
                       Final procedure ..................................................          19       18
              V.       CALIBRATION PROCESS FOR MODELS
                       120B AND 120BR
                       Equipment setup................................................            20        19
                       Intensity limit ....................................................       21        19
                       Vertical amplifier dc balance .............................                22        20
                       Triggering range and level.................................                23        21
                       Vertical and horizontal sensitivity and range ...                          24        23
                       Calibrator...........................................................      25        24
                       Vertical amplifier frequency response and
                       attenuator compensation ...................................                26        24
                       Horizontal amplifier frequency response and
                       attenuator compensation ...................................                27        27
                       Amplifier phase shift..........................................            28        28
                       Sweep timing......................................................         29        28
                       Sweep magnifier.................................................           30        29
                       Power supply......................................................         31        30
                       Final procedure ..................................................         32        30


                                  SECTION I
                       IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.           This bulletin provides instructions for the
calibration of Oscilloscope, Hewlett-Packard Models 120A, 120AR, 120B, and 120BR. The
manufacturer's instruction manuals were used as the prime data source in compiling these
instructions. The oscilloscope will be referred to as the "TI" (test instrument) throughout
this bulletin.

    a. Model Variations. Variations among models are described in text.

   b. Time and Technique. The time required for this calibration is approximately 4
hours using the dc and low frequency technique.

2. Calibration Data Card, DA Form 2416

    a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TM 38-750. DA Form 2416 must be annotated in accordance with TM 38-750
for each calibration performed.

   b. Adjustments to be reported on DA Form 2416 are designated (R) at the end of the
sentence in which they appear. When adjustments are in tables, the (R) will follow the
designated adjustment. Report only those adjustments made and designated with (R).


2
                                                                                        TB 9-6625-082-50
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.

                                      Table 1. Calibration Description
             Test instrument parameters                             Performance specifications
  Power input requirements1                            115 or 230 vac 



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