DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
AC AMPLIFIER AM-1881/U (HEWLETT-
PACKARD MODEL 450A) AND HEWLETT-
PACKARD MODEL 465A
Headquarters, Department of the Army, Washington, DC
20 February 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 FOR AC
AMPLIFIER AM-1881/U (HEWLETT-
PACKARD MODEL 450A)
Preliminary instructions.......................................
Equipment setup ...................................................
Gain and stability..................................................
Frequency response...............................................
Distortion ...............................................................
Noise.......................................................................
Power supply .........................................................
Final procedure .....................................................
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*This bulletin supersedes TB 9-6625-1213-35; dated 5 March 1982, including all changes.