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TM 11-6625-2779-14&P
This manual contains copyrighted material reproduced by permission of Hewlett-Packard Company. All rights are
reserved.
TECHNICAL MANUAL HEADQUARTERS
DEPARTMENT OF THE ARMY.
No. 11-6625-2779-14&P WASHINGTON, DC, 11 March 1980
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL
SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND
SPECIAL TOOLS LISTS) FOR
METER, AUDIO LEVEL TA-885/U
(HEWLETT-PACKARD MODEL 3555B)
(NSN 6625-00-255-1083)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to
improve the procedures, please let us know. Mail your letter or DA Form 2028 (Recommended
Changes to Publications and Blank Forms), or DA Form 2028-2 located in back of this manual
direct to Commander, US Army Communications and Electronics Materiel Readiness Command,
ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ 07703.
In either case, a reply will be furnished direct to you.
This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to
cover the data required to operate and maintain this equipment. The manual was not prepared in accordance with
military specifications; therefore, the format has not been structured to consider categories of maintenance.
Para Page
SECTION 0. INTRODUCTION
Scope ...............................................................................................................................0-1 0-1
Indexes of Publications .....................................................................................................0-2 0-1
Maintenance forms, records, and reports...........................................................................0-3 0-1
Administrative storage.......................................................................................................0-4 0-2
Destruction of Army electronics materiel............................................................................0-5 0-2
Reporting of equipment improvements recommendations (EIR).........................................0-6 0-2
Items comprising an operable equipment ..........................................................................0-7 0-3
I. GENERAL INFORMATION
Introduction.......................................................................................................................1-1 1-1
Accessory equipment supplied ..........................................................................................1-9 1-2
Instrument identification....................................................................................................1-11 1-2
150 BAL modification........................................................................................................1-13 1-2
II. INSTALLATION
Inspection .........................................................................................................................2-1 2-1
Warranty exception...........................................................................................................2-3 2-1
Power requirements ..........................................................................................................2-5 2-1
Three-conductor power cable ............................................................................................2-7 2-1
Battery..............................................................................................................................2-10 2-1
Installation and removal of battery.....................................................................................2-12 2-2
Cover removal...................................................................................................................2-15 2-2
Repackaging for shipment.................................................................................................2-17 2-2
III. OPERATING INSTRUCTIONS
Introduction.......................................................................................................................3-1 3-1
Controls, connectors and indicators...................................................................................3-4 3-1
Operation..........................................................................................................................3-6 3-1
Battery..............................................................................................................................3-8 3-1
Level and noise measurements.........................................................................................3-12 3-5
Level measurements.........................................................................................................3-14 3-5
Noise measurements ........................................................................................................3-28 3-7
Recorder compatibility.......................................................................................................3-41 3-8
Applications ......................................................................................................................3-45 3-8
Transmission loss measurements .....................................................................................3-48 3-10
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