Instruction/ maintenance manual of the product TM 11-6625-2779-14&P HP (Hewlett-Packard)
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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.
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.
SECTION III. OPERATING INSTRUCTIONS (Cont.). Para Page Crosstalk measurements ................................................................................................... 3-53 3-10 Identifying noise characteristics .............................
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 .
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.
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) .
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.
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.
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.
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.
Model 3555B Section II SECTION II INSTALLATION 2-1. INSPECTION. 2-2. The set was carefully inspected both mechanically and electrically before shipment.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 .
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 vdc.
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.
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 Supp.
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 .
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 5.
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.
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.
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.
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.
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.
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 .
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.
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.
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 Arm.
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PIN: 043606-000.
An important point after buying a device HP (Hewlett-Packard) TM 11-6625-2779-14&P (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought HP (Hewlett-Packard) TM 11-6625-2779-14&P yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data HP (Hewlett-Packard) TM 11-6625-2779-14&P - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, HP (Hewlett-Packard) TM 11-6625-2779-14&P you will learn all the available features of the product, as well as information on its operation. The information that you get HP (Hewlett-Packard) TM 11-6625-2779-14&P will certainly help you make a decision on the purchase.
If you already are a holder of HP (Hewlett-Packard) TM 11-6625-2779-14&P, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime HP (Hewlett-Packard) TM 11-6625-2779-14&P.
However, one of the most important roles played by the user manual is to help in solving problems with HP (Hewlett-Packard) TM 11-6625-2779-14&P. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device HP (Hewlett-Packard) TM 11-6625-2779-14&P along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
