DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
OSCILLOGRAPHIC RECORDER (HEWLETT-PACKARD TYPE 7402A)
AND
Headquarters, Department of the Army, Washington, DC
20 May 1981
REPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this bulletin. If you find any mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter, DA Form 2028 (Recommend Changes to Publication and
Blank Forms), direct to: Commander, U. S. Army Armament Materiel Readiness Command, ATTN:
DRSAR-MAS, Rock Island, IL 61299. A reply will be furnished to you.
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IDENTIFICATION AND DESCRIPTION
Test instrument identification .......................................
Calibration data card (DA Form 2416) .........................
Calibration description..................................................
EQUIPMENT REQUIREMENTS
Equipment required ......................................................
Accessories required....................................................
PRELIMINARY OPERATIONS
Preliminary instructions ................................................
Equipment setup ..........................................................
Dc balance ...................................................................
Attenuator balance .......................................................
Dc calibration................................................................
Sensitivity vernier span.................................................
Frequency response.....................................................
Power check.................................................................
Final procedure ............................................................
RECORDER
Paper speeds ...............................................................
Paper weave ................................................................
Event marker, 1 SEC ...................................................
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