HP-175A-Manual_SNprefix_235 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by vvwvv. h parc Please visit us on the web ! Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 O P E R A T I N G A N D S E R V I C E MANUAL MODEL 175A

2、SERIALS PREFIXED: 235 - OSCILLOSCOPE 4 1963 Copyrieh) H t W L t I T - P A C K A R O C O M P A N Y 1501 PAOt MILL ROAD, P A L 0 ALlO, CALIFORNIA, U.S.A. 01526-1 0 Printed: FEB 1963 RadioFans.CN 收音机爱 好者资料库 Table of Contents Model 175A TABLE OF CONTENTS Section Page I GENERALINFORMATION * * * . * * 1-1

3、 1.1 . Description . . . . . . . . . . . 1-1 1.3 . Auxiliary EquipmeQt . . . . . . . 1-1 1.5 . Instrument Identification . . . . 1-1 1.7 . Warranty . . . . . . . . . . . 1-1 1.9 . Special Features . . . . . . . . 1-4 1 . 1 1 . Cathode-Ray Tube . . . . . . . 1-4 1.13 . Special Controls . . . . . . .

4、. 1-4 I1 INSTALLATION . . . . . . . . . . . . 2-1 2.1 . Incoming Inspection . . . . . . . 2-1 2.2 . MechanicalInspection . . . . . 2-1 2.4 . Performance Check . . . . . . 2-1 2.6 . Installation . . . . . . . . . . 2-1 2.8 . Rack Mounting . . . . . . . . . 2-1 2.13 . Power Requirement . . . . . . 2-1

5、 2.15 . Safety Power Cable . . . . . . . 2-1 2.17 . Repackaging for Shipment . . . . . 2-1 2.10 . cooling . . . . . . . . . . . . 2-1 m OPERATION . . . . . . . . . . . . . 3-1 3.1 . General . . . . . . . . . . . . . 3-1 3.3 . Beam Finder . . . . . . . . . 3-1 3.5 . Calibration . . . . . . . . . . 3-

6、1 3.7 . Triggering . . . . . . . . . . . 3-1 3.9 . Trigger Source . . . . . . . . 3-1 3.11 . Trigger Level . . . . . . . . . 3-1 3.13 . Trigger Slope . . . . . . . . . 3-1 3.15 . Sweep Mode . . . . . . . . . . 3-1 3.17 . Sweep Controls . . . . . . . . . 3-1 3.18 . Sweep Time . . . . . . . . . . 3-1

7、3.20 . Sweep Magnifier . . . . . . . . 3-1 3.23 . Horizontal Functions . . . . . . . 3-1 3.25 . Intensity Modulation . . . . . . . 3-1 3.27 . Step-by-StepProcedures . . . . 3-1 I V PRINCIPLES OF OPERATION . * . * * 4-1 4.1 . Overall FunctionDescription . . . 4-1 4.9 . Vertical Amplifier . . . . . .

8、. . 4-1 4.11 . Cross-Coupled Cathode Follower. 4-2 4.13 . Differential Amplifier . . . . . 4-2 4.15 . Peaking . . . . . . . . . . . . 4-2 4.17 . Sync Amplifier . . . . . . . . 4-2 4.19 . Delay Line . . . . . . . . . . 4-2 4.21 . Circuit Protection . . . . . . . 4-1 4.23 . Scan Output . . . . . . . .

9、 . . 4-2 4.25 . Sweep Generator . . . . . . . . . 4-2 4.27 . Trigger Generator . . . . . . 4-2 4.30 . SweepGeneratingcircuits . . . 4-3 Section Page IV PRINCIPLES OF OPERATION (Contd) 4.38 . Single-Sweep Operation . . . . . 4-4 4.40 . Schmitt Trigger Circuit . . . . . 4-4 4.43 . Horizontal Amplifier

10、 . . . . . . . 4-5 4.47 . High-Voltage Power Supply . . . . 4-6 4.51 . Intensity Control . . . . . . . . 4-6 4.53 . Scale Control . . . . . . . . . 4-6 4.55 . Low-Voltage Power Supplies . . . 4-6 V MAINTENANCE . . . . . . . . . . . . 5-1 5.1 . Introduction . . . . . . . . . . . 5-1 5.3 . Servicing t

11、he Air Filter . . . . . . 5-1 5.5 . Performance Check . . . . . . . 5-1 5.7 . Test Equipment . . . . . . . . 5-1 5.9 . Preliminary Settings . . . . . . 5-1 5.11 . Horizontal Amplifier . . . . . . 5-1 5.14 . Sweep Generator . . . . . . . . 5-2 5.20 . Vertical Amplifier Bandwidth . . 5-3 5.21 . Calibr

12、ator . . . . . . . . . 5-4 5.22 . Intensity Modulation . . . . . . 5-4 5.23 . (Option Feature) . . . . . . . 5-4 5.24 . Accessory Probes . . . . . . . 5-4 5.25 . Adjustments . . . . . . . . . . . 5-4 5.27 . Equipment Neededfor Adjustments 5-4 5.29 . Locationof Adjustments . . . . 5-4 5.31 . Prelimin

13、ary Settings . . . . . . 5-4 5.33 . Low-Voltage Power Supplies . . 5-5 5.35 . High-Voltage Power Supply . . . 5-5 5.40 . Horizontal Amplifier . . . . . . 5-8 5.47 . Sweep Generator . . . . . . . 5-10 5.53 . Vertical Amplifier . . . . . . . 5-11 5.58 . Calibrator . . . . . . . . . . 5-12 5.59 . Repai

14、rs . . . . . . . . . . . . . 5-12 5.61 . Equipment Required . . . . . . 5-13 5.64 . Procedure . . . . . . . . . . 5-13 5.67 . Troubleshooting . . . . . . . . . 5-13 5.68 . Major Section . . . . . . . . 5-13 5.70 . Low-Voltage Power Supplies . . 5-13 5.77 . High-Voltage Power Supplies . . 5-16 Sweep

15、and Gate Output Isolating Troubles to a 5.81 . Vertical Amplifier . . . . . . . 5-16 5.87 . Sweep Generator . . . . . . . . 5-17 5.93 . Horizontal Amplifier . . . . . . 5-18 VI REPLACEABLE PARTS . . . . . . . . 6-1 6 . 1 . Introduction . . . . . . . . . . . 6 . 1 6.4 . Ordering Information . . . . .

16、 . 6-1 ii 01526-1 List of Illustrations List of Tables Model 175A Number Title LIST OF ILLUSTRATIONS 1-1. 1-2. 3-1. 3-2. 3-3. 3-4. 3-5. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. Model 175A Oscilloscope with MOI !11750A and Model 1780A

17、 Plug-In Units . . . 1-0 Cathode-Ray TubeWarranty. . . . . . 1-2 Model 175A Controls and Terminals . . 3-0 Internal Sweep . . . . . . . . . . . . 3-2 Magnified Sweep . . . . . . . . . . . 3-3 Probe Compensation . . . . . . . . . 3-4 Intensity Modulation . . . . . . . . . 3 -5 Overall Block Diagram o

18、f Model 175A with Model 1750A Plug-In Unit . . . 4-0 Vertical Amplifier Block Diagram . . . 4-1 Cross-Coupled Cathode Follower Simplified Schematic Diagram . . . . 4-2 Sweep Generator Block Diagram. . . . 4-3 Trigger Generator Simplified Circuit and Composite Characteristic . . . . 4-4 Simplified Sc

19、hmitt Trigger Circuit. . . 4-5 Horizontal Amplifier Block Diagram . . 4-5 High-Voltage Power -Supply Block Diagram. . . . . . . . . . . 4-6 Low-Voltage Power-Supply Block Diagram. . . . . . . . . . . 4-7 Test Plug . . . . . . . . . . . . . . 5-5 Adjustments and Component Locations, Top View . . . .

20、. . . . . . . . . 5-6 Adjustments and Component Locations, Bottom View. . . . . . . . . . . . 5-7 Pattern Adjustment. . . . . . . . . . 5-8 Frequency Compensation . . . . . . . 5 -9 Attenuator Compensation . . . . . . . 5-10 Trigger Sensitivity . . . . . . . . . 5-10 Scan Balance . . . . . . . . . .

21、 . . 5-11 Mid - Frequency Response Preliminary Adjustment . . . . . . 5-12 Mid-Frequency Response Final Adjustment. . . . . . . . . . 5-12 High-FrequencyResponse . . . . . . 5-12 Model 175A Component Locations, T D View . . . . . . . . . . . . . 5-19 5-13. ModLl 175A Component Locations, 5-14. Model

22、 175A Component Locations, Bottom View. . . . . . . . . . . . 5-20 Right Side View . . . . . . . . . . 5-21 LIST OF Number Title Page 1-1. Specifications . . . . . . . . . . . . 1-1 1-2. Associated Equipment and Accessories. 1-3 5-1. Adjustments . . . . . . . . . . . . 5-0 5-2. Sweep Calibration . .

23、 . . . . . . . . 5-3 5-3. Power Supply Tolerances . . . . . . . 5-5 Test Equipment for Checks and Number Title Page 5-15. Model 175A Component Locations, Left Side View . . . . . . . . . . 5-21 5-16. A1 Vertical-Input Assembly Component Locations . . . . . . . 5-23 5-17. A2 Vertical-Output Assembly

24、Component Locations . . . . . . . 5-24 5-18. Beam-Finder Switch S1, Mounted Components . . . . . . . 5 -2 5 5-19. Vertical Amplifier (schematic diagram) 5-25 5-20. A101 Sweep-Generator Assembly Component Locations . . . . . . . 5-26 5-21. A102 Trigger-Source Switch Assembly, Mounted Components . , .

25、 . . . . 5 -26 5-22. A103 Trigger-Level and -Slope Switch Assembly, Mounted Components . . 5-26 5-23. Sweep Generator (schematic diagram) 5-27 5-24. AlOOl Sweep-Switch Circuit Board Component Locations . . . . . . . 5-28 5-25. A1002 Sweep-Time Switch Assembly, Mounted Components . . . . . . . 5-28 5

26、-26. Sweep-Time Switch (schematic diagram). . . . . . . . 5-29 5-27. A201 Horizontal Amplifier Assembly Component Locations . . . . . . . 5-30 5-28. A202 Horizontal Display Switch Assembly, Mounted Components . . . . . . . 5-30 5-29. Horizontal Amplifier (schematic diagram)5 -31 5-30. A301 High-Volt

27、age and Calibrator Assembly Component Locations . . 5-32 5-31. A302 High-Voltage Deck Assembly Component Locations . . . . . . . 5-32 5-32. High-Voltage Power Supply and Calibrator (schematic diagram). . . 5-33 5-33. A401 Low-Voltage Power Supply Component Locations . . . . . . . 5-34 5-34. Low-Volt

28、age Power Supply. (schematic diagram) . . . . . . . 5-35 5-35. Heater Circuit (schematic diagram . . 5-36 5-36. A701 Gate- and Sweep-Output Assembly Component Locations . . . . . . . 5-36 5-37. Gate and Sweep Output (schematicdiagram) . . . . . . . 5-36 5-38. Connectors . . . . . . . . . . . . 5-37

29、TABLES Number Title Page 5-4. Sweep Time . . . . . . . . . . . . 5-11 5-5. Troubleshooting the Low -Voltage Supply 5-14 5-6. Vertical Amplifier Troubleshooting. . 5-17 5-7. SweepGenerator Troubleshooting Guide 5-17 5-8. Horizontal Amplifier Troubleshooting . 5-18 6-1. Index by ReferenceDesignator .

30、. . . 6-2 6-2. Replaceable Parts . . . . . . . . . 6-13 01526-1 iii Section I Figure 1-1 Model 175A Figure 1-1. Model 175A Oscilloscope with Model 1750A and Model 1780A Plug-In Units 01526-1 1-0 Model 175A SECTION I GENERAL I N F O R M A T I O N Section I Paragraphs 1-1 to 1-8 1-1. DES C R I PTI 0 N

31、. 1-2. The Model 175A Oscilloscope is a calibrated general-purpose test instrument with a vertical band- width of 50 megacycles and a 6 x 10 cm display. Op- tional plug-in units and accessories are available to increase the versatility of this instrument. Specifi- cations are listed in table 1-1. 1-

32、3. AUXILIARY EQUIPMENT. 1-4. are listed in table 1-2. Available associated equipment and accessories a. Plug-Ins. Plug-in units for the Model 175A in- clude dual-trace and single-trace vertical amplifiers which collectively cover 5 mv/cm to 20 v/cm sensi- tivities and dc to 50-mc bandwidth. Horizont

33、al units include single sweep, sweep delay, a time-mark generator, and a display scanner. b. Accessories. Each oscilloscope is supplied with two Model 10003A (AC-21M) high-impedance probes and a detachable power cable. 1-5. INSTRUMENT IDENTIFICATION. 1-6. Hewlett-Packard uses a two-section eight-dig

34、it serial number (000-00000). If the first three digits of the serial number on your instrument do not agree with those on the title page of this manual, change sheets supplied with the manual will define differences between your instrument andthe Model 175A described in this manual. 1-7. WARRANTY.

35、1-8. Both the cathode-ray tube (crt) and Model 175A carry Hewlett-Packard warranties. The crt warranty is illustrated in figure 1-2, and a copy is included at the back of this manual for your use in the event of tube failure within the warranty period. The Model 175A warranty is also at the back of

36、this manual. Table 1-1. Specifications SWEEP GENERATOR Internal Sweep: 24 ranges, 0.1 psec/cm to 5 sec/cm *3%. Ver- nier provides continuous adjustment between ranges and extends slowest sweep to at least 12.5 sec/cm. Magnification: X10 (*5%) Triggering: Internal - Vertical input signal (from 2 mm b

37、elow 1 mc to approximately 2 cm at 50 mc). External - Either capacitive- or direct-coupled, from any signal 0.5 volt peak-to-peakor more. Triggering Point: Internal - Any level of positive- or negative- going signal displayed on the crt graticule. External - Any level between +5 and -5 volts on eith

38、er the positive- or negative-going por- tion of the vertical signal. HORIZONTAL AMP LIFTER Bandwidth DC to 500 kc Sensitivity: 2 ranges, 0.1 volt/cm and 1 volt/cm. Vernier provides continuous adjustment between ranges and extends minimum sensitivity to 10 volts per centimeter. Input Impedance: 1 meg

39、ohm shunted by approximately 30 pf VERTICAL AMPLIFTER Bandwidth: DC to greater than 50 mc CALIBRATOR Type: Approximately 1000-cycle square wave, approxi- mately 3 psec rise time 2 ranges, 1 volt and 10 volts peak-to-peak, *l%, 15C to 35C Voltage: CATHODE-RAY TUBE Type: post accelerator, 12-kv accele

40、rating potential. Type P31-AL phosphor standard. For other phosphors, see OPTIONS. Internal, 6 x 10 cm, marked in centimeter squares. Major horizontal and vertical axes have 2-millimeter subdivisions. Intensity Modulation: Approximately +20-volt pulse will blank trace of normal intensity Graticule:

41、GENERAL Power Requirements: 115 or 230 volts ac *lo%, 50 to 60 cps, approxi- mately 425 watts maximum (depends on plug-ins used). 01526-1 1-1 Section I Figure 1-2 Table 1-1. Specifications (Contd) Model 175A GENERAL (contd) Dimensions: 16-3/4 inches wide, 12-1/4 inches high, 24-3/8 inches deep overa

42、ll; hardware furnished for quick conversion to 12-1/4-inch x 19-inch rack mount, 22 inches deep behind panel. Weight: Net approximately 70 lb maximum (depends on plug-ins used) Plug-In Vertical Amplifiers: ($3 Model 1750A Dual Trace Vertical Amplifier, Model 1751A Single Channel Vertical Ampli- Mode

43、l 1752A High Gain Vertical Amplifier, Model 1753A Single Channel Vertical Ampli- dc to 40 arx fier,dc to 50 mc dc to 18 mc fier, dc to 40 mc Plug-In Horizontal Time Base Units: ($3 Model 1780A Auxiliary Unit Model 1781A Sweep Delay Unit Model 1782A Display Scanner Model 1783A Time-Mark Generator Acc

44、essories Furnished; Two probes, 10003A (AC-21M), 1O:l voltage division, one power cable ($3 1075A, 1075B (AC-83A) Viewing Hood ($3 Model 1115A Testmobile ( $ 4 Model Accessories Available: 196B Oscilloscope Camera, includes ultraviolet light source for illuminating the graticule and pre-sensitizing

45、film OPTIONS 02. Supplied with P2 phosphor 07. Supplied with P7 phosphor 11. Supplied with P11 phosphor 08. Sawtooth Output (approximately -2.5 volts to +2.5 volts) and Gate Output (+5-volt pulse nominal, riding on a - 2.5 volt level). HEWLETT-PACKARD CO. PAGE MILL ROAD. PAL0 ALTO. CALIF. U.S.A. Fig

46、ure 1-2. Cathode-Ray Tube Warranty 1-2 01526-1 Model 175A Section I Table 1-2 Model Name Table 1-2. Associated Equipment and Accessories Description 1752A 1750A High Gain 0.005 v/cm to 20 v/cm sensitivity, dc to 18 mc bandwidth. Vertical Amplifier Dual-input differential display, single channel. Dua

47、l Trace Vertical Amplifier 1753A Dual-trace and differential display, 0.05 v/cm to 20 V/Cm sensitivity, 9 nsec rise time (dc to 40 mc bandwidth). 7-nsec rise time, (dc to 50 mc bandwidth), 0.05 v/cm to 20 v/cm sensitivity. Single Channel Vertical Amplifier 1751A 1780A Fast Rise Plug-In Auxiliary Plu

48、g-In Single or normal sweep, manual or external arming. 1783A Single channel, single input, 0.05 v/cm to 20 v/cm sensitivity, 9-nsec rise time (dc to 40 mc bandwidth). Time-Mark Generator Provides intensity modulating time markers synchronized with sweep. Marker intervals 0.1, 1, or 10 psec. 1075A o

49、r 1075B (AC-83A) Viewing Hood Shades crt screen from surrounding light sources. 1781A Sweep Delay Generator 0 to 10 cm of sweep delay. Will either trigger or arm main sweep. Horizontal display controlled by either main sweep or delaying sweep for all or part of trace. Delaying sweep rate 2psec/cm to 1 sec/cm. Provides output to operate conventional X-Y recorder. Includes pen stabilizer for nearly constant writing rate