DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
VOLTAGE CALIBRATOR, BALLANTINE
MODEL 421A
Headquarters, Department of the Army, Washington, DC
20 August 2004
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,
US Army Aviation and Missile Command, AMSAM-MMC-MA-NP, Redstone Arsenal,
AL 35898-5000. A reply will be furnished to you. You may also provide DA Form
2028 information to AMCOM via e-mail, fax, or the World Wide Web. Our fax
number is DSN 788-6546 or Commercial 256-842-6546. Our e-mail address is
2028@redstone.army.mil. Instructions for sending an electronic 2028 may be found
at the back of this manual.
For the World Wide Web, use
https://amcom2028.redstone.army.mil.
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 ..................................................
Output stability ....................................................
Ac voltage..............................................................
Dc voltage .............................................................
Distortion and frequency .....................................
Final procedure ....................................................
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*This technical bulletin supersedes TB 9-4931-290-50, dated 31 May 1979, including all changes.
