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1、TM 11-6625-1515-15 DEPARTMENT OF THE ARMY TECHNICAL MANUAL ORGANIZATIONAL, DS, GS, AND DEPOT MAINTENANCE MANUAL FREQUENCY CONVERTER, HEWLETT-PACKARD MODEL 5253B HEADQUARTERS, DEPARTMENT OF THE ARMY MAY 1967 RadioFans.CN 收音机爱 好者资料库 TM 11-6625-1515-15 TABLE OF CONTENTS SectionPage I GENERAL .1-0.1 1-A

2、.1. Scope .1-0.1 1-A.2. Index of Publications .1-0.1 1-A.3. Forms and Records .1-0.1 1-1. Description .1-1 1-5. Specifications .1-1 1-7. Equipment Supplied .1-1 1-9. Cooling.1-1 IIPREPARATION FOR USE .2-1 2-1. Unpacking and Mechanical Inspection.2-1 2-3. Electrical Inspection.2-1 2-5. Storage and Re

3、shipment .2-1 2-8. Installation .2-1 2-11. Power Requirements .2-1 2-13. Electrical Connections .2-1 IlIOPERATION.3-1 3-1. Front Panel .3-1 3-3. Maximum Input Voltages .3-1 3-5. Operating Procedures .3-1 3-6. Normal Range Measurements .3-1 3-8. Extended Range Measurements.3-1 3-12. Double-Checking F

4、requency Measurement Result .3-1 3-14. Aid to Rapid Tuning.3-3 IVPRINCIPLES OF OPERATION .4-1 4-1. General .4-1 4-5. Harmonic Generator (A2, A3), and Harmonic Selector Cavity.4-1 4-7. Mixer (A4) .4-2 4-9. Video Amplifier Assembly (Al) .4-2 4-11. Level Indicator Meter .4-2 VMAINTENANCE .5-1 5-1. Gene

5、ral .5-1 5-2. Introduction .5-1 5-4. Periodic Maintenance .5-1 5-6. Test Equipment .5-1 5-8. Troubleshooting.5-1 SectionPage V MAINTENANCE (contd) 5-10. Repair and Replacement .5-1 5-12. Printed Circuit Component Replacement .5-3 5-14. Video Amplifier Assembly Replacement.5-3 5-16. Mixer Diode Repla

6、cement .5-3 5-18. Meter Replacement Procedure .5-3 5-20. Harmonic Generator Adjustment.5-4 5-22. Low Pass Filter Adjustment.5-4 5-25. Mechanical Adjustment of Meter Zero .5-5 5-28. Sensitivity Check .5-5 5-29. Meter Accuracy Check.5-5 5-30. Low Pass Filter Check .5-5 5-31. In-Cabinet Performance Che

7、ck.5-6 i RadioFans.CN 收音机爱 好者资料库 TM 11-6625-1515-15 Section I Figure 1-1Model 5253B Figure 1-1. Model 5253B and Accessory ii RadioFans.CN 收音机爱 好者资料库 TM 11-6625-1515-15 This manual contains material copyrighted by Hewlett-Packard Company SECTION I GENERAL 1-A.1. Scope This manual includes installatio

8、n and operation instructions and covers operators, organizational, direct support (DS), general support (GS), and depot maintenance. It describes Hewlett-Packard (Federal Supply Code 28480) Frequency Converter Model 5253B (fig. 1-1) with serial numbers prefixed by 513 and 450. A basic issue items li

9、st for this equipment is not included in this manual. 1-A.2. Index of Publications Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertaining to the equipment. DA Pam 310-4 is an index of current technical manuals, technical

10、bulletins, supply manuals (types 7, 8, and 9), supply bulletins, lubrication orders, and modification work orders that are available through publications supply channels. The index lists the individual parts (-10, -20, - 35P, etc) and the latest changes to and revisions of each equipment publication

11、. 1-A.3. Forms and Records a. Reports of Maintenance and Unsatisfactory Equipment. Use equipment forms and records in accordance with instructions in TM 38-750. b. Report of Damaged or Improper Shipment. Fill out and forward DD Form 6 (Report of Damaged or Improper Shipment) as prescribed in AR 700-

12、58 (Army), NAVSANDA Publication 378 (Navy), and AFR 71-4 (Air Force). c. Reporting of Equipment Manual Improvements. Report of errors, omissions, and recommendations for improving this manual by the individual user is encouraged. Reports should be submitted on DA Form 2028 (Recommended Changes to DA

13、 Publications) and forwarded direct to Commanding General, U. S. Army Electronics Command, ATTN: AMSEL-MR-NMP-AD, Fort Monmouth, New Jersey 07703. 1-0.1 TM 11-6625-1515-15 Model 5253BSection I 1-1. DESCRIPTION. 1-2. The Hewlett-Packard Model 5253B Frequency Converter is a plug-in unit which converts

14、 a Hewlett- Packard Model 5243L or 5245L Electronic Counter into a direct reading counter from 50 to 512 Mc. 1-3. The stability and accuracy of the basic counter are retained by multiplying a 10-Mc signal, derived from the 1-Mc internal time base of the counter, to a selectable harmonic frequency be

15、tween 50 and 500 Mc. This known harmonic of 10 Mc is then heterodyned with the INPUT signal. If the resulting difference frequency is between 100 kc and 12 Mc (bandwidth of amplifier in plug-in), it is counted and displayed by the counter. The frequency of the INPUT signal is then indicated by the c

16、ombination of the MIXING FREQUENCY control (in megacycles; front panel of plug-in) and the digital display of the counter (in megacycles). 1-4. A front panel meter, by monitoring the difference- frequency output of the plug-in to the counter, aids in selecting the desired MIXING FREQUENCY and also i

17、n determining if INPUT signal amplitude is adequate for accurate frequency measurement. 1-5. SPECIFICATIONS. 1-6. Table 1-1 contains all technical specifications for the Model 5253B when operated in the Model 5243L or Model 5245L Electronic Counter. Test specifications given in the Maintenance Secti

18、on (Section V) of this manual, for the purposes of troubleshooting and adjustment, do not represent the technical specifications of the instrument. 1-7. EQUIPMENT SUPPLIED. 1-8. A 50-ohm coaxial cable, 48 inches long, male BNC to male BNC, is furnished with the Model 5253B. 1-9. COOLING. 1-10. The M

19、odel 5253B is cooled by the ventilation system of the counter in which it is installed. See operating and service manual of counter for cooling system maintenance instructions. Table 1-1. Specifications* RANGE: As converter for 5243L or 5245L counter, 50 Mc to 512 Mc, using mixing frequencies of 50

20、Mc to 500 Mc in 10 Mc steps. ACCURACY:Retains accuracy of 5243L or 5245L counter INPUT VOLTAGE RANGE:50 mv to 1 v RMS MAXIMUM INPUT:2 v RMS or 100 vdc will not damage the instrument INPUT IMPEDANCE:Approximately 50 ohms LEVEL INDICATOR:Meter aids frequency selection; indicates output voltage level t

21、o counter REGISTRATION:Counter display is added to the converter dial reading WEIGHT:Net 5-1/2 lbs, shipping 9 lbs *When installed in Hewlett-Packard Model 5243L or Model 5245L Electronic Counter. 01874-1 1-1 TM 11-6625-1515-15 Model 5253BSection II Paragraphs 2-1 to 2-14 SECTION II PREPARATION FOR

22、USE 2-1. UNPACKING AND INSPECTION. 2-2. Inspect the equipment for any damage incurred during transit. If the equipment has been damaged, report the damage on DD Form 6 (para 1-A.3). 2-3. ELECTRICAL INSPECTION. 2-4. The performance check procedure (Paragraph 5-31) may be used to verify proper electri

23、cal operation as part of an incoming quality control inspection. 2-5. STORAGE AND RESHIPMENT. 2-6. PACKAGING. To protect valuable electronic equipment during storage or reshipment, always use the best packaging methods available. a.Original. Place instrument in original container. Replace each packi

24、ng pad and filler in the exact position that it originally occupied. b.Alternate. Cover panel with soft wrapping paper. Wrap corrugated cardboard completely around instrument and place in strong corrugated cardboard container (350 lb/sq in. bursting test). Insert filler material between wrapped inst

25、rument and container to obtain a snug fit on all surfaces. Filler should be rubberized hair (2 in. thick), excelsior (6 in. thick), or equivalent. 2-7. ENVIRONMENT. Conditions during storage and shipment should normally be limited as follows: a.Maximum altitude 20, 000 feet (6, 096 meters). b.Minimu

26、m temperature -40 F (-40 C). c.Maximum temperature 167 F (75 C). CAUTION TURN COUNTER POWER OFF BEFORE INSTALLING OR REMOVING FREQUENCY CONVERTER. 2-8. INSTALLATION. 2-9. The Model 5253B plugs into the rectangular compartment at the right-hand side of the front panel of the Model 5243L or 5245L Elec

27、tronic Counter. To install unit in counter, first check that retaining screw (see Figure 3-1) is turned fully counterclockwise, then push unit firmly into compartment until front panel of plug-in is flush with front panel of counter. Then turn retaining screw clockwise until it is tight. 2-10. To re

28、move unit from counter, turn retaining screw counterclockwise to its stop. Then grasp mixing frequency selector (see Figure 3-1) and firmly pull unit from counter. If any difficulty is encountered with installation or removal, check that retaining screw is fully counterclockwise. 2-11. POWER REQUIRE

29、MENTS. 2-12. All electrical power required to operate the Model 5253B is supplied by the counter in which the unit is installed. 2-13. ELECTRICAL CONNECTIONS. 2-14. INPUT connector on front panel of plug-in (see Figure 3-1) is the only external electrical connection to the unit. All other connection

30、s are made through the 50- pin connector at the rear of plug-in when installed in counter. 01874-2 2-1 TM 11-6625-1515-15 Section IIIModel 5253B Figure 3-1 1.INPUT signal connector. 2.MIXING FREQUENCY SELECTOR. Calibrated in mc, this control tunes the internal cavity to select a harmonic of 10 me to

31、 be heterodyned with the INPUT signal. 3.LEVEL INDICATOR METER. The meter cir- cuit continuously monitors the level of the difference-frequency output of converter to counter. When meter reads in the green por- tion of its scale, INPUT signal amplitude is adequate for accurate frequency measurement.

32、 4.RETAINING SCREW. The screw which holds the converter in place is located on the front panel of the counter. To tighten, turn fully clockwise. To loosen, turn fully counter- clockwise. Figure 3-1. Front Panel 01874-3 3-0 TM 11-6625-1515-15 Model 5253BSection III Paragraphs 3-1 to 3-13 SECTION III

33、OPERATION 3-1. FRONT PANEL. 3-2. The functions of the front panel control, meter, connector, and retaining screws are given in Figure 3-1. 3-3. MAXIMUM INPUT VOLTAGES. 3-4. Damage to the converter may result if an AC signal greater than 2 v RMS or a DC voltage greater than 100 v is applied to conver

34、ter INPUT connector. 3-5. OPERATING PROCEDURES. 3-6. NORMAL RANGE MEASUREMENTS. 3-7. Figure 3-2 is the procedure to be used for measurement of frequencies from 50. 1 to 512 Mc with INPUT signal amplitudes from 50 mv to 1 v RMS. 3-8. EXTENDED RANGE MEASUREMENTS. 3-9. The frequency of signals not with

35、in the normal range of 50.1 to 512Mc, 50 mv to lv RMS, may be measured using the following procedures: 3-10. 50 TO 50.1 MC, 50 MV TO 1 V RMS. Perform steps 1 through 5 of Figure 3-2. Then: a.Set mixing frequency control to slightly more than 60 Mc. b.Turn mixing frequency control slowly clockwise un

36、til level indicator meter first reaches a maximum reading in the green portion of its scale. c.Subtract counter display (in Mc) from reading of mixing frequency control (in Mc) for frequency of INPUT signal. 3-11. 50 TO 512 MC, AMPLITUDE LESS THAN 50 MV RMS. The front panel level indicator meter ind

37、icates in the green portion of its scale only when converter is properly tuned and amplitude of INPUT signal is adequate for accurate frequency measurement. However, because of conservative specifications of both the converter and counter, frequencies may often be accurately measured when meter read

38、s in the red portion of its scale. To make these extended range measurements: a.Follow normal procedure (Figure 3-2 or Paragraph 3-10, depending upon frequency range) except that mixing frequency control should be tuned for first maximum reading on the level indicator meter, regardless of the color

39、of region maximum. b.Check frequency measurement result as described in Paragraph 3-12, or c. Insert an external variable attenuator (such as Hewlett-Packard Model 355A or 355C) in the transmission line between the converter and the source of INPUT signal. Vary attenuation from 0 to 1 db during fina

40、l step of frequency measurement procedure. If counter display does not change more than momentarily (during switching of attenuator), INPUT signal is above noise threshold and frequency measurement result is valid. 3-12. DOUBLE-CHECKING FREOUENCY MEASUREMENT RESULT. 3-13. Because of the heterodyne a

41、ction of the converter, frequency measurement results obtained at any one setting of the mixing frequency control may be checked at other settings. See Figure 3-3 for examples. Table 3-1. Frequency Resolution INPUT SIGNAL FREQUENCY = 151.1223344 Mc MIXING FREQUENCY CONTROL set to 140 Mc Time BaseCou

42、nter DisplayMeasurement Resolution Setting .1 s* (no display) 1 s1 1. Mc1 5 1. Mc 10 s1 1.1 Mc1 5 1.1 Mc .1 ms1 1.1 2 Mc1 5 1.1 2 Mc 1 ms1 1 1 2 2. kc1 5 1.1 2 2 Mc 10 ms1 1 1 2 2.3 kc1 5 1.1 2 2 3 Mc .1 s1 1 1 2 2.3 3 kc1 5 1.1 2 2 3 3 Mc 1 s1 1 1 2 2.3 3 4 kc1 5 1.1 2 2 3 3 4 Mc 10s1 1 2 2.3 3 4 4

43、 kc1 5 1.1 2 2 3 3 4 4 Mc 01874-2 3-1 TM 11-6625-1515-15 Section IIIModel 5253B Figure 3-2 1.Turn SAMPLE RATE control slightly out of POWER OFF position. 2.Set SENSITIVITY to PLUG IN. 3.Set TIME BASE to .1 ms.* 4.Set FUNCTION to FREQUENCY. 5.Connect signal whose frequency is to be measured to INPUT

44、of converter. 6.Set mixing frequency control to read slightly less than 50 Mc. 7.Slowly turn mixing frequency control counterclockwise until level indicator meter first reaches a maximum reading in the green portion of its scale. 8.Add counter display (in Mc) to mixing frequency control reading (in

45、Mc) for frequency of INPUT signal. * TIME BASE setting may vary, depending on desired resolution of INPUT signal frequency. See Table 3-1. Figure 3-2. Frequency Measurement Procedure 01874-3 3-2 TM 11-6625-1515-15 Model 5253BSection III Paragraphs 3-14 to 3-15 3-14. AID TO RAPID TUNING 3-15. To easily obtain an indication of the proper MIXING FREQUENCY when rapidly tuning the Model 5253B through its frequency range in search of an unknown INPUT frequency, set counter FUNCTION control to MANUAL START. This allows the c