HP (Hewlett-Packard) TM 11-6625-2779-14&P manuel d'utilisation

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[...]

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 (INCLUDI[...]

SECTION III. OPERATING INSTRUCTIONS (Cont.). Para Page Crosstalk measurements ................................................................................................... 3-53 3-10 Identifying noise characteristics ......................................................................................... 3-57 3-10 Measurements in DBC ........[...]

Model 3555B Table of Contents LIST OF ILLUSTRATIONS Number Page Number Page 1-1 . Model 3555B Transmission and Noise Measuring Set ................................. . 1-1 4-7 . Simplified Peak Detectio n ............................... . 4-7 2-1 . Power Plug s ................................................ . 2-1 5-1 . Balanced BNC to 310 Plu g ..[...]

SECTION 0 INTRODUCTION 0-1. Scope This manual contains instructions for the operation, organizational maintenance and general support maintenance of Audio Level Meter TA-885/U. Throughout this manual, the equipment is referred to by its commercial designation of Hewlett-Packard Model 3555B Transmission and Noise Measuring Set or simply as the 3555B[...]

b . Report of Packaging and Handling Deficiencies . Fill out and forward DD Form 6 (Packaging Improvement Report) as prescribed in AR 700-58/NAVSUPINST 4030.29/AFR 71-13/MCO P4030.29A, and DLAR 4145.8. c . Discrepancy in Shipment Report (DISREP) (SF 361) . Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in AR 55-[...]

0-7. Items Comprising an Operable Equipment Audio Level Meter TA-885/U includes the meter, with cover and a power cord. The power cord is stored inside the cover of the set. 0-3[...]

Section I Model 3555B Table 1-1. Specifications VOICE FREQUENCY LEVEL MEASUREMENTS (20Hz balanced and 75 ohms unbalanced. to 20kHz) Return loss: TERM ONLY 600 ohms: 26dB min 3kHz to 150kHz Range: -91dBm to +31dBm 135 ohms: 26dB min to 600kHz 75 ohms: 30dB min to 3MHz Level accuracy: 20Hz to 20kHz: +0.5dB Bridging loss: less than 0.05dB at 10kHz 40H[...]

Model 3555B Section I SECTION I GENERAL INFORMATION 1-1. INTRODUCTION. 1-2. The Hewlett-Packard Model 3555 B Transmission and Noise Measuring Set is a versatile set designed for uses in testing telecommunications equipment. The extreme sensitivity of this set, linked with its wide and flat frequency response, make it suitable for noise and level me[...]

Section I Model 3555B 1-5. A noise-to-ground (Ng) function is included which permits the measurement of longitudinal noise. When making noise-to ground measurements the impedance between INPUT terminals is greater than 80 kilohms and is 100 kilohms between each terminal and ground. A HOLD function permits holding the line while noise measurements a[...]

Model 3555B Section II SECTION II INSTALLATION 2-1. INSPECTION. 2-2. The set was carefully inspected both mechanically and electrically before shipment. It should be physically free of mars or scratches and in perfect electrical condition on receipt. To confirm this, the set should be inspected for physical damage in transit, for supplied accessori[...]

Section II Model 355B 2-12. INSTALLATION AND REMOVAL OF BATTERY. 2-13. To install or replace a battery, turn the four 1/4 turn fasteners on the battery cover on the rear of the case counterclockwise to remove the cover. Lift off the cover, lift the battery out of its recess and unplug the three-prong connector. 2-14. Reverse the above procedure whe[...]

Section III Model 3555B SECTION III OPERATING INSTRUCTIONS 3-1. INTRODUCTION. 3-2. The Model 3555B Transmission and Noise Measuring Set is an extremely versatile transmission and noise measuring set which satisfies many of the requirements in testing telecommunications equipment. The 3555B features a choice of 900 or 600 ohms bridging or terminated[...]

Section III Model 3555B Figure 3-1. Front Panel Controls, Indicators, and Connectors 3-2[...]

Model 3555B Section III Table 3-1. Front, Side and Rear Pane (1) S and G Jacks: Bindi ng posts accepting banana plugs, spade lugs, phone tips or bare wires for connection to the case ground (G) and sleeves (S) of all INPUT jacks (12) and DIAL/AC MON jacks (10) and (11). (2) Shorting Strap: A swing-away shorting strap connecting the S and G terminal[...]

Section III Model 3555B Figure 3-2. Side Panel Controls and Connectors 3-4[...]

Model 3555B Section III Table 3-1. Front, Side and Rear Panel Controls, Indicators and Connectors (Cont ’ d) 2. 135: Selects the input circuitry for 135 ohm balanced circuits. A high frequency transformer is selected for this function. 3. 75: Selects the input circuitry for 75 ohm unbalanced operation. Only the 75 ohm jack can be used for this fu[...]

Section III Model 3555B frequency Transmission Measuring Set (TMS) for voice, program and carrier multiplex measurements. The set will operate over a wide range of environmental conditions and maintain a high degree of accuracy. 3-16. In general, t ransmission level measurements are made by connecting the circuit under test to the INPUT jacks with [...]

Model 3555B Section III when no input signal is present and a mechanical zero adjust is not required. The actual input level to the set is the algebraic sum of the black dBm meter scale and black RANGE setting. For example, RANGE is set to 40dBm and the meter indicates -6.3dBm. The input level is then (- 40) + (-6.3) = -46.3dBm. If the RANGE switch[...]

Section III Model 3555B 3-35. As an aid in identifying the source of n oise, the DIAL/AC MON jacks can be used with a monitoring receiver to listen to the noise which will have approximately the same quality as that heard by a subscriber. Particular types of noise like power line induction, switching noise, atmospheric static, crosstalk or random n[...]

Model 3555B Section III Figure 3-4. Recorder Compatibility Chart Figure 3-5. Simplified Send/Receive Test Set-up 3-9[...]

Section III Model 3555B 236A FUNCTION switch to 600 HOLD or 900 HOLD, depending on the impedance required. To receive a tone, set the 3555B FUNCTION switch to either 600 HOLD or 900 HOLD (whichever is appropriate) and change the 236A FUNCTION switch to DIAL. To send again, simply change the 236A to 600 HOLD or 900 HOLD. If holding is not required o[...]

Model 3555B Section III Figure 3-7. Test Setup for Measuring Crosstalk Coupling Loss 3-58. Normally, a frequency selective voltmeter is used to identify the characteristics of transmission line interference in order to trace it down to its origin and apply the appropriate corrective action. As an expedient for troubleshooting, there are several sub[...]

Section III Model 3555B Figure 3-8. Simple Test for Inductive and Capacitive Coupling 0dBC = 0.775V across any impedance as read on an -hp- Model 400D AC Vacuum Tube Voltmeter. Thus, the dBC is strictly a relative term. 3-66. Measurements can easily be made in dBC. by utilizing the Model 3555B Telephone Test Meter. To make these measurements, set F[...]

Model 3555B Section III Table 3-3. Level Measurement STEP PROCEDURE 1. Turn the 3555B/ON and depress the DIAL/BAT pushbutton. The meter should indicate in the green BAT GOOD area. If it does not, replace the battery or check the power source before attempting to make any measurements. The battery test operates for internal battery, office battery o[...]

Section III Model 3555B Table 3-5. Noise-to-Ground Measurements STEP PROCEDURE 1. Turn the 3555B POWER switch to ON and depress the DIAL/BAT pushbutton. The meter should indicate in the green BAT GOOD area. If it does not replace the battery or check the power source. The battery test operates for internal battery, office battery or ac power source[...]

Model 3555B Section IV SECTION IV THEORY OF OPERATION 4-1. INTRODUCTION. 4-2. The Model 3555B Transmission and Noise Measuring Set is a special measuring set designed for uses in testing telecommunications equipment. Inputs between -90dBm and +30dBm full scale can be selected in twelve ranges for level measurements and correspond to the black marki[...]

Section IV Model 3555B 4-13. The output of the Input Amplifier goes to the INPUT switch where noise filters are set up for selection by the NOISE WTG switch. In the NOISE position, either 3kHz FLAT weighting, C Message weighting, 15kHz FLAT weighting or PROGRAM weighting can be selected by the NOISE WTG switch. In the TMS position of the INPUT swit[...]

Model 3555B Section IV Figure 4-3. Simplified NG Function e. 600 (Vf/Nm): The 600 function switch S5 selects terminating resistors A1R2 and A1R10 for a 600 ohm termination. The INPUT switch completes the circuit for this termination. The 600 (Vf/Nm) signal is applied to T2. No gain switching is performed in this function since the set is normalized[...]

Section IV Model 35 55B Table 4-1. Range Attenuation and Amplifier Gain RANGE RANGE ATTENUATOR Setting Attenuation PADS USED Input Amplifier Gain +30dBm 80dB 1,2,3 3.6dB +20dBm 70dB 1,2,4 3.6dB +10dBm 60dB 1,2 3.6dB 0dBm 50dB 2,3 3.6dB -10dBm 40dB 2,4 3.6dB -20dBm 30dB 2 3.6dB -30dBm 20dB 3 3.6dB -40dBm 10dB 4 3.6dB -50dBm 0dB 0 3.6dB -60dBm 0dB 0 [...]

Model 3555B Section IV Figure 4-5. 3kHz FLAT and Program Weighting Curves 4-5[...]

Section IV Model 3555B Figure 4-6. C-MSG and 1SkHz FLAT Weighting Curves 4-6[...]

Model 3555B Section IV identical in operation, only the first will be discussed in detail. 4-27. Referring to Figure 7-4, the signal is applied to the assembly through pin 22. If C MSG is selected the signal is first attenuated by A4R1, A4R2 and A4R3A. Potentiometer A4R3A is for C MSG level adjustment for 0dB at 1kHz. The signal is then applied to [...]

Section IV Model 3555B 4-35. Now consider the peak detection. (See Figure 7-5) When A3Q14 is turned on and A3Q17 is turned off, no current flows through the meter from the peak detector When A3Q14 is turned off and A3Q17 is turned on, the current path is as shown by the heavy lines in Figure 4-7 Diodes A3CR12 and A3CR13 are included to offset the j[...]

Model 3555B Section V SECTION V MAINTENANCE 5-1. INTROOUCTION. 5-2. This section of the manual contains information necessary in the maintenance of the -hp- Model 3555B Transmission and Noise Measuring Set. Included are performance checks, adjustment and calibration procedures and troubleshooting. 5-3. The test equipment needed to properly maintain[...]

Section V Model 3555B Figure 5-1. Balanced BNC to 310 Plug function, remove or clip the shorting bar from across A1 R17 (see Figure 7-2). b. Remove the 150 BAL decal from the small envelope supplied with the set and stick it over the existing 135 BAL decal. c. Adjust the 150 function as described in Paragraph 5-20 in this manual. 5-7. PERFORMANCE C[...]

Model 3555B Section V Table 5-2. 75 UNBAL Carrier Accuracy Check 3555B INDICATION (dBm) RANGE FREQUENCY 30Hz to 1MHz 100Hz to 600kHz 1MHz to 3MHz +10dBm +10 ± 0.5 +10 ± 0.2 +10 ±0.5 ±10% of meter indication in dBm 0dBm 0 ±0.5 0 ± 0.2 0 ±0.5 ±10% of meter indication in dBm -10dBm -10 ± 0.5 -10 ±0.2 -10 +0.5 ± 0% of meter indication in dBm[...]

Section V Model 3555B Figure 5-3. +20dBm and +30dBm Level Accuracy Check 5-10. RETURN LOSS CHECK. a. To make a return loss check it will first be necessary to construct a balanced bridge utilizing 0.1% resistors for each of the four 3555B impedances. Figure 5-4 shows the equipment test set-up to be used. For this check to be meaningful, all test le[...]

Model 3555B Section IV Figure 5-4. Return Loss Test Set-Up d. Open S1 and down range the 400FL for an on-scale indication. This indication subtracted from the reference established in step c, is the bridge balance and should be greater than the return loss specification. e. Unplug or disconnect R4 in Figure 5-4 and connect the 3555B tip and ring in[...]

Section V Model 3555B Figure 5-6. Bridging Loss Test Set-Up j. Change the bridge resistors in Figure 5-4 to 135 ohms +0.1% and change the 3555B FUNCTION to 135 BAL. Check the return loss between 1kHz and 600kHz. The return loss must be better than 26dB down from the reference. k. Change the 3555B input connection to the 75 UNBAL jack. Change the re[...]

Model 3555B Section V 1. Reset the 654A output level for 0dBm indication on the 3555B meter at a frequency of 1kHz. 2. Check the frequencies listed in Table 5-5 for the tolerances indicated. d. PROG FILTER R ESPONSE 1. Reset the 654A frequency to 1kHz and adjust the output level for 0dBm indication on the 3555B meter. 2. Check the frequencies liste[...]

Section V Model 3555B CARRIER 600 and repeat the above procedure. Between 1kHz and 10kHz, the balance must be greater than 70dB. Between 10kHz and 100kHz, the balance must be better than 60dB. Between 100kHz and 600kHz, balance must be better than 40dB. 5-14. ADJUSTMENT AND CALIBRATION PROCEDURE. 5-15. The following is a complete adjustment and cal[...]

Model 3555B Section V c. Adjust A3R15 for 0dBm indication on the 3555B meter. d. Change the 654A frequency to 1kHz. Change the 3555B FUNCTION switch to VF/Nm, 600 BAL. Compare the 3555B meter indication with the indication in step c. If any difference exists, adjust A3R15 to split the difference between these two indications. NOTE If the set is bei[...]

Section V Model 3555B CARRIER function, change C4. To change the balance on VF/Nm, change the value of A1C9. c. To determine whether the value of these capacitors should be increased or decreased, lightly touch the tip and ring banana jack insulators and watch the direction in which the meter indication goes. The side (tip or ring) that causes the [...]

Model 3555B Section V Figure 5-8. Troubleshooting Tree Paragraph 5-38 Paragraph 5-37 Paragraph 5-36 Paragraph 5-35 5-11[...]

Section V Model 3555B Table 5-6. Front Panel Trouble Analysis 3555B SHOULD INDICATE SET ACTUALLY CORRECTIVE INPUT CONDITIONS FUNCTION (RANGE + METER)* INDICATES ACTION FUNCTION: VF/Nm DIAL BAT In green area, BAT GOOD Replace battery 1kHz, 0dBm, 600 BAL Input: TMS, TERM VF/Nm: 600 BAL 0dBm ± 0.2dBm Refer to Paragraph 5-34 Change INPUT to BRDG RANGE[...]

Model 3555B Section V Table 5-6. Front Panel Trouble Analysis (Cont'd) 3555B SHOULD INDICATE SET ACTUALLY CORRECTIVE INPUT CONDITIONS FUNCTION (RANGE + METER)* INDICATES ACTION LEVEL -30dBm Change RANGE t o -30dBm -30dBm ± 0.2dBm See Paragraph 5-35 LEVEL 40dBm Change RANGE to 400dBm -40dBm ± 0.2dBm See Paragraph 5-35, Table 5-9 LEVEL -500dBm[...]

Section V Model 3555B Table 5-7. Function Troubleshooting DEFECTIVE FUNCTION VF/Nm CARRIER 75 UNBAL A3K2 135 BAL A1T2, A3K3, A3R22,A3R23, A3L1, A3R24 600 BAL A1T2 600 BAL A1T1 900 BAL A1T1, A3K1, A3R19, A3R20 NG A1R5 thru A1R8, A1C1, A1S3 HOLD L1A/B, A1S1 S1 DIAL BAT A1S2, A3R59 a. First determine from the Front Panel Trouble Analysis chart (Table [...]

Model 3555B Section V Table 5-8. FUNCTION Switch Resistance Values NOTE The following resistance measurements were made with C1 shorted. Be sure to remove the short after completion of your measurements. INPUT JACKS DIAL/AC MON JACKS FUNCTION Tip to Ring Tip to Ground Ring to Ground BRDG TERM BRDG TERM BRDG TERM DIAL BAT NG 80.4 kilohms 80.4 kilohm[...]

Section V Model 3555B Table 5-9. Range Attenuation and Amplifier Gain Attenuator Pads Used Amplifier Gain (See Figure 7-3) Switching RANGES 1 2 3 4 +30 X X X +20 X X X +10 X X 0 X X -10 X X -20 X -30 X -40 X -50 -60 A2R13, A2R14 -70 A2R13 -80 Ranges Affected +30 -20 +30 +20 -60 and -70 If Defective +20 thru 0 -10 +10 +30 -30 -40 Table 5-11. Factory[...]

PERFORMANCE CHECK TEST CARD Hewlett-Packard Model 3555B Tests Performed By Transmission and Noise Measuring Set Serial No. Date DESCRIPTION CHECK CARRIER 75 UNBAL LEVEL AC CURACY CHECK 30Hz to 1MHz +10dBm Range +10dBm ± 0.5dBm 0dBm Range 0dBm ± 0.5dBm -10dBm Range -10dBm ± 0.5dBm -20dBm Range -20dBm ± 0.5dBm -30dBm Range -30dBm ± 0.5dBm -40dBm[...]

PERFORMANCE CHECK TEST CARD (Cont'd) C ARRIER 600 BAL LEVEL ACCURACY CHECK 1kHz to 150kHz +10dBm Range +10dBm ± 0.5dBm 0dBm Range 0dBm ± 0.5dBm -10dBm Range -10dBm ± 0.5dBm -20dBm Range -20dBm ± 0.5dBm -30dBm Range -30dBm ± 0.5dBm -40dBm Range -40dBm ± 0.5dBm -50dBm Range -50dBm ± 0.5dBm 10kHz to 100kHz +10dBm Range +10dBm ±0.2dBm 0dBm[...]

PERFORMANCE CHECK TEST CARD (Cont'd) RETURN LOSS CHECK 600 ohms 900 ohms VF/Nm 30Hz to 20kHz >3 0dB CARRIER 600 ohms, 1kHz to 150kHz >26dB 135 ohms, 1kHz to 600kHz > 26dB 75 ohms, 1kHz to 3MHz >30dB FILTER RESPONSE CHECKS C-MSG 60Hz -55.7dBm ± 2dBm 200Hz -25dBm ± 2dBm 500Hz -7.5dBm ± 1dBm 1kHz 0dBm (Ref) 2kHz -1.3dBm ± 1dBm 2.5[...]

Model 3555B Section VI SECTION VI REPLACEABLE PARTS 6-1. INTRODUCTION. 6-2. This section contains information for ordering replacement parts. Table 6-1 lists parts in alphameric order of their reference designators and indicates the description, -hp- part number of each part, together with any applicable notes, and provides the following: a. Total [...]

Section VI Model 3555B Table 6-1. Replaceable Parts REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A1 03555-66507 1 PC Board Ass'y: function -hp- C1 0170-0055 1 C: fxd mylar 0.1uF +/-20% 200 vdcw 56289 192P10402-PTS C2.C3 0180-0089 2 C: fxd Al elect 10uF +50% -10% 150 vdcw 56289 30D106F150DD2-DSM C4 0121-4105 3 C: var 9-3[...]

Model 3555B Section VI Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A2 (Cont'd) R6 0683-1805 1 R: fxd comp 18 ohms +/-5% 1/4W 01121 CB1805 R7 0698-4342 1 R: fxd met flm 90 kilohms +/-0.1% 1/8W 91637 MF-1/10-32 obd R8 0698-4339 1 R: fxd met flm 11.11 kilohms +/-0.1% 1/8W' 9[...]

Section VI Model 3555B Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A3 (Cont'd) CR20 1902-1275 Diode: zener 6.2V +/-5% 400mW 7.5mA 04713 Type 1N821 CR21 1901 0040 Diode: Si 30 wiv 2pF 30mA 2ns 07263 FDG1088 K1 thru K3 0490-0780 3 Relay Ass'y: reed -hp- 0490-0778 3 Reeds 95[...]

Model 3555B Section VI Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A3 (Cont'd) R40 0684 4721 R: fxd comp 4700 ohms +/-10% 1/4W 01121 CB4721 R41,R42 0698-3382 2 R: fxd met flm 5.49 kilohms +/-1% 1/8W 91637 MF-1/10-32 obd R43 2100-1770 1 R: var ww 00 ohm +/-10O% 1/2W trimmer 802[...]

Section VI Model 3555B Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A4 (Cont'd) C31 0180-0228 C: fxd Ta elect 22uF +/-10% 15 vdcw 37942 TAS226K015P1C C32 0180-0291 C: fxd Ta elect 1uF +/-10% 35 vdcw 56289 150D105X9035A2-DYS C33 0180-0387 1 C: fxd Ta elect 47uF +/-5% 20 vdcw 379[...]

Model 3555B Section VI Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. A4 (Cont'd) R47 0698-7370 1 R: fxd met flm 17.579 kilohms +/-0.1% 1/8W 91637 CMF-1/10-32 obd R48 0684-1051 R: fxd co mp 1 megohm +/-10% 1/4W 01121 CB1051 R49 0684-1021 R: fxd comp 1000 ohms +/-10% 1/4W 01121 CB[...]

Section VI Model 3555B Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. CHASSIS MOUNTED COMPONENTS (Cont'd) 03555-67902 1 Power Supply Ass'y -hp- R1 0757-0795 1 R: fxd met flm 75 ohms +/-1% 1/2W 91637 MFF-1/2-T-1 obd R2 0698-4205 1 R: fxd met flm 21 kilohms +/-1% 1/8W 91637 MF[...]

Model 3555B Section VI Table 6-1. Replaceable Parts (Cont'd) REFERENCE -hp- TQ DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. MISCELLANEOUS (Cont'd) 1251-1145 1 Plug: battery 72825 7364 525C-49A 2 Handle: panel -hp- 00236-04105 1 Cover: battery -hp- 1390-0186 Stud: fastener cadmium plated steel 71286 26542-4 00741-01212 2 Bracket: met[...]

TM 11-6625-2779-14&P TABLE 6-2. PART NUMBER - NATIONAL STOCK NUMBER CROSS REFERENCE INDEX REPLACEMENT NATIONAL NATION AL PART STOCK PART S TOCK NUMBER FSCM NUMBER NUMBER FSCM NUMBER CB1001 01121 5905-0 0-989-8653 RCR07G100 JS 81349 5905-00-107 -0656 CB1041 01121 5905-00 -254-7432 RCRO7G104J S 81349 5905-00-110- 0388 CB1541 01121 5905-00 -726-53[...]

6-11[...]

Model 3555B Appendix A 6-12[...]

CODE LIST OF MANUFACTURERS (Continued) 6-13[...]

Model 3555B Section VII SECTION VII CIRCUIT DIAGRAMS 7-1. INTRODUCTION. 7-2. This section of the Manual contains circuit diagrams for the Model 3555B Transmission and Noise Measuring Set. The functional block diagram (Figure 7- 1) contains signal levels to assist in troubleshooting. The schematic diagrams (Figures 7-2 through 7-5) show dc voltage l[...]

Section VII Model 3555B 7-2[...]

Figure 7-1. Functional Block Diagram 7-3/7-4[...]

Figure 7-2. A1 Function Assembly Schematic and Component Location 7-5/7-6[...]

Figure 7-3. A2 Range Attenuator and A3 Input Amplifier Schematic and Component Location 2 7-7/7-8[...]

Figure 7-4. A4 Filter Schematic and Component Location 7-9/7-10[...]

Figure 7-5. A3 Meter Amplifier, Detector and Series Regulator Schematic and Component Locations 7-11/7-12[...]

APPENDIX A REFERENCES DA Pam 310-4 Index of Technical Manuals, Technical Bulletins, Supply Manuals (Types 7, 8, and 9), Supply Bulletins and Lubrication Orders. DA Pam 310-7 US Army Equipment Index of Modification Work Orders. TM 11-6625-320-12 Operator ’ s and Organizational Maintenance Manual: Voltmeters ME-30A/U, and voltmeters, Electronic, ME[...]

APPENDIX B MAINTENANCE ALLOCATION Section I. INTRODUCTION B-1. General This appendix provides a summary of the maintenance operations for TA-885/U. It authorizes categories of maintenance for specific maintenance functions on repairable items and components and the tools and equipment required to perform each function. This appendix may be used as [...]

F - Direct Support H - General Support D - Depot e. Column 5, Tools and Equipment . Column 5 specifies by code those common tool sets (not individual tools) and special tools, test, and support equipment required to perform the designated function. f. Column 6, Remarks . Column 6 contains an alphabetic code which leads to the remark in section IV, [...]

TM 11-6625-2779-14&P SECTION II. MAINTENANCE ALLOCATION CHART FOR AUDIO LEVEL METER TA-885/U (1) (2) (3) (4) (5) (6) MAINTENANCE CATEGORY GROUP MAINTENANCE TOOLS AND NUMBER COMPONENT ASSEMBLY FUNCTION C O F H D EQUIPMENT REMARKS 00 AUDIO LEVEL METER TA-885/U Inspect 0.5 7 (HP 3555B) Test 0.5 1 thru 7 Service 0.8 1 thru 7 Repair 1.2 1 thru 7 Ove[...]

TM 11-7725-2779-14&P SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR AUDIO LEVEL METER TA-885/U TOOL OR TEST MAINTENANCE NATIONAL/ TOOL EQUIPMENT CATEGORY NOMENCLATURE NATO STOCK NUMBER REF CODE NUMBER 1 H,D OSCILLATOR SG-1128/U, HP #654A 6625-00-450-7590 2 H,D OSCILLATOR AN/URM-127 6625-00-783-5965 3 H,D TRANSFORMER (LINE MATCHING) MX-83[...]

Model 3555B APPENDIX C Appendix C MANUAL BACKDATING CHANGES Model 3555B TRANSMISSION AND NOISE MEASURING SET This manual backdating sheet makes this manual applicable to earlier instruments. Instrument-component values that differ from those in the manual, yet are not listed in the backdating sheet, should be replaced using the part number given in[...]

Appendix C Model 3555B Change part no. of the case assembly to 03555-04505. Change cover part no. to 03555-04504. Table 6-1. Change the part no. of the power cord to 81 20-0249. Change the part no. of the power connector J1 to 1251-0148. Change No. 5 Table 6-1. Change to the following gray parts: Cover, battery 00236-04104 Bracket, meter 00741-0 12[...]

By Order of the Secretary of the Army: E. C. MEYER General, United States Army Official: Chief of Staff J. C. PENNINGTON Major General, United States Army The Adjutant General DISTRIBUTION: Active Army: HISA (Ft Monmouth) (21) USAICS (3) USAINSCOM (2) MAAG (1) COE (1) USARMIS (1) TSG (1) USAERDAA (1) USAARENBD (1) USAERDAW (1) DARCOM (1) Ft Carson [...]

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PIN: 043606-000[...]