HP TM 11-6625-2779-14&P instruction

TM 11-6625-2779-14&P

TECHNICAL MANUAL

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)

HEADQUARTERS, DEPARTMENT OF THE ARMY

11 MARCH 1980

Image 1

HP TM 11-6625-2779-14&P manual HEADQUARTERS, Department of the Army

Contents

HEADQUARTERS, Department of the Army TM 11-6625-2779-14&P Reporting Errors and Recommending ImprovementsTechnical Manual Headquarters Department of the Army NSN Replaceable Parts List of Tables List of IllustrationsIii Section Introduction Maintenance Forms, Records, and ReportsScope Destruction of Army Electronics Materiel Administrative StorageReporting Equipment Improvement Recommendations EIR Items Comprising an Operable Equipment Voice Frequency Level Measurements 20Hz to 20kHz Specifications Section General Information Introduction Section Accessory Equipment Supplied Accessory Equipment SuppliedInstrument Identification BAL Modification Warranty Exception Section Installation InspectionPower Requirements Battery Cover Removal Installation and Removal of Battery Battery Controls Connectors IndicatorsSection Operating Instructions Front Panel Controls, Indicators, and Connectors Front, Side and Rear Pane Side Panel Controls and Connectors Level Measurements Level and Noise MeasurementsPage Noise Measurement Applications Recorder Compatibility Recorder Compatibility Chart Transmission Loss Measurements Identifying Noise CharacteristicsCrosstalk Measurements Crosstalk Correction Factor Measurements in DBC 0dBm Reinstall the set in its caseInput jacks are connected in parallel. If a 600 ohm 135 BAL Level Measurement Noise Metallic Measurements Step Procedure Recorder Calibration Noise-to-Ground Measurements Balance MeasurementExample Transmission Loss Measurement Section Theory of Operation Introduction Block Diagram Description Simplified Dial BAT Function Detailed Circuit Description Range Attenuator A2 Input Amplifier A3. Schematic No FILTERS. Schematic No Setting AttenuationRange Attenuator Pads Used KHz Flat and Program Weighting Curves C-MSG and 1SkHz Flat Weighting Curves DETECTOR. Schematic No Meter AMPLIFIER. Schematic No Power Supply and Series Regulator Schematic No Instrument Recommended Type Required Characteristics Model Section Maintenance IntroouctionFactory Selected Values BAL Conversion Level Accuracy Checks Performance ChecksFunction CARRIER, 75 Unbal TMS, Term Range Unbal Carrier Accuracy CheckFrequency 30Hz to 1MHz 100Hz to 600kHz 1MHz to 3MHz 20Hz to 20kHz 40Hz to 15kHz 100Hz to 20kHz 100Hz to 15kHz Return Loss Check Return Loss Test Set-Up Filter Response Checks Filter Response ChecksMSG dBm 3kHz Flat dBm 15kHz Flat dBm Program dBm Bridging Loss Input BalanceTMS Brdg Input TMS Brdg Power Supply Check Adjustment and Calibration ProcedureUnbal Calibration Attenuator Calibration Common Mode Adjustment Frequency Response AdjustmentBalance Check Troubleshooting Procedures Assembly RemovalFilter Calibration Troubleshooting Tree Dial BAT Front Panel Trouble Analysis Function Troubleshooting Front Panel TroubleshootingRange Troubleshooting Front Panel Trouble Analysis Contd Filter Troubleshooting Troubleshooting Input AmplifierTroubleshooting the Meter Amplifier and Detector Defective Function Function Input Jacks DIAL/AC MON Jacks Function Switch Resistance ValuesTip to Ring Tip to Ground Ring to Ground Brdg Term 10. Resistance Checks 11. Factory Selected ValuesRange dBm Pin 1 to Pin 2 to Description Check Performance Check Test CardCarrier 75 Unbal Level Accuracy Check Carrier 135 BAL Level Accuracy Check Carrier 600 BAL Level Accuracy Check Performance Check Test Card Contd Filter Response Checks MSG Return Loss CheckProgram Bridging Loss Check Ordering Information Section Replaceable Parts Introduction 03555-66507 PC Board Assy function Replaceable Parts 03555-66508 Board Assy amplifier Replaceable Parts Contd A3 Contd 03555-66506 PC Board Assy filter A4 Contd Chassis Mounted Components Miscellaneous Chassis Mounted Components Contd Miscellaneous Contd Part Number National Stock Number Cross Reference Index Replacement National Part Stock Number FscmFscm National Stock NumberPage Model 3555B Appendix a Code List of Manufacturers Functional Block Diagram Circuit DiagramsSchematic Diagrams Reference Designations Section Model 3555B 7-4 Functional Block Diagram 7-6 A1 Function Assembly Schematic and Component Location 7-8 7-10 A4 Filter Schematic and Component Location 11/7-12 References Appendix a Maintenance Function Maintenance Allocation Section I. Introduction GeneralAppendix B Column Entries Remarks Sec Tool and Test Equipment Requiremen ts Sec Audio Level Meter TA-885/U REF Code Number TM 11-7725-2779-14&P Manual Backdating Changes Appendix CTransmission and Noise Measuring SET Government Printing Office 1980-603-128/66 Delete CR6 across M1 Chief of Staff General, United States ArmyMajor General, United States Army Adjutant General Active ArmyPage PIN