*TB 9-4931-538-40
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
DIGITIZING OSCILLOSCOPE
HEWLETT PACKARD, MODEL 54121T CONSISTING OF
DIGITIZING OSCILLOSCOPE MAINFRAME
HEWLETT PACKARD, MODEL 54120B, AND
FOUR-CHANNEL TEST SET
HEWLETT PACKARD, MODEL 54121A
Headquarters, Department of the Army, Washington, DC
9 April 2008
Distribution Statement A: Approved for public release; distribution is unlimited.
REPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS
You can improve this manual. If you find any mistakes or if you know of a way to improve these
procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to
Publications and Blank Forms) directly to: Commander, U.S. Army Aviation and Missile Command,
ATTN: AMSAM-MMC-MA-NP, Redstone Arsenal, AL 35898-5000. A reply will be furnished to
you.
You may also send in your comments electronically to our E-mail address:
2028@redstone.army.mil or by fax 256-842-6546/DSN 788-6546. For the World Wide Web use:
https://amcom2028.redstone.army.mil. Instructions for sending an electronic 2028 can be found at
the back of this manual.
Paragraph
Page
IDENTIFICATION AND DESCRIPTION
Test instrument identification..............................
Forms, records, and reports ..................................
Calibration description..........................................
EQUIPMENT REQUIREMENTS
Equipment required ..............................................
Accessories required ..............................................
CALIBRATION PROCESS
Preliminary instructions .......................................
Equipment setup ...................................................
Bandwidth..............................................................
Dc voltage measurement and rms noise ..............
Time interval accuracy short delta t and long
delta t .....................................................................
Trigger sensitivity and jitter test .........................
TDR system............................................................
Input reflection ......................................................
Final procedure ......................................................
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*This bulletin supersedes TB 9-4931-538-50, dated 17 August 1992.