HP-122A-AR-Manual 电路图.pdf

I . : HP Archive . . This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! . . On-line curator: Tony Gerbic RadioFans.CN 收音机爱 好者资料库 a d n O P E R A T I N G A N D S E R V I C E M A N U A L DUAL TRACE OSCILLOSCOPE 122AIAR HEWLETT fi PACKARD Pd RadioFans.CN 收音机爱 好者资料库 i O P E R A T I N G A N D SERVICE M A N U A L MODEL 122A/AR OSCILLOSCOPE SERIALS PREFIXED: 521- 68 2 10 See Section VI1 for Instruments with other Serial Prefixes. Copyright HEWLETT-PACKARD COMPANYICOLORADO SPRINGS DIVISION 1966 1900 GARDEN OF THE GODS ROAD, COLORADO SPRINGS, COLORADO, U. S. A 00081 - 4 PRINTED: AU6 1967 RadioFans.CN 收音机爱 好者资料库 Table of Contents Model 122A/AR TABLE OF CONTENTS Section Page I GENERAL INFORMATION - . - . * 1-1 1-1. Description . . . . . . . . . . . . . . 1- 1 1-4. Cathode-Ray Tube . . . . . . . . . . 1-1 1-7. Cathode-Ray Tube Warranty. . 1-2 1-9. Accessory Available . . - - 1-2 1-11. Manual Identification - 1-2 1-13. Scope of Manual - - - . - 1-2 Section Page v MAINTENANCE. . . . . . . . . . . . . . 5-1 5-1. Introduction. . . . . . . . . . . . . 5-1 5-3. Test Equipment. . . . . . . . . . . 5- 1 5-5. Performance Check . . . . . . . . 5- 1 5-7. Vertical Amplifier . . - 5-1 5-14. Horizontal Amplifier. - . - 5-2 5-17. Sweep Generator. - - . - 5-2 5-21. Adjustments . a _ - . 5-4 5-24. Turn On Procedure . 5-4 5-26. Trigger Generator - - 5- 5 5-30. Vertical Amplifiers * - - 5-5 5-44. SweepGenerator . - - * 5 -7 . . . . . . . . . . . . . fl INSTALLATION. - 2-1 2-1. Initial Inspection - - . - . - * 2-1 2-4. Claims and Repackaging 2-1 2-7. Preparation for Use - - . - * 2-1 2-8. Power Requirements - . - * 2-1 . . . . . . . 5-38. Horizontal Amplifier - - - 5-6 2-10. 230-Volt Operation * - - 2-1 VI REPLACEABLE PARTS * * - * * 6- 1 2-12. Three-Conductor Power Cable * 2-1 6-1. Introduction . - - * - * - - * 6- 1 2-14. Ventilation Requirements * * * 2-1 6-4. Ordering Information - - - * - - * * 6- 1 VI1 MANUAL CHANGES AND OPTIONS - * 7-1 2-16. Installation of Amber Filter - - - - 2-1 . . . . . . . . . . . . . . . 1 1 1 OPERATION 3-1 3-1. Introduction. - - - - - - * 3-1 3-3. Controls and Connectors + - * * 3-1 3-17. Rear PanelConnectors . - - 3-1 IV PRINCIPLES OF OPERATION * * * * 4-1 4-1. Over-All Description - * - - * 4-1 4-2. Generalcontent - * + - * * 4-1 4-4. Vertical Amplification Channels 4-1 4-6. Vertical Presentation Switch 4-2 4-8. Horizontal Amplification Switch 4-2 4-16. High Voltage Power Supply * + . 4-3 4-11. Sweep Generator * - - - 4-2 4-18. Low Voltage Power Supply * 4-3 7-1. Manualchanges . - - - 7-1 7-3. Older Instruments - - - * * - 7-1 7-5. Newer Instruments . - - 7-2 7-7. Options . . . . . . . . . . . . . . . 7-2 7-9. Option05. 7-2 7-11. Option 06. 7-2 . . . . . . . . . . . . . . . . . . . . . . . . 7-13. Special Instruments - - - - - * * - 7-2 VI11 SCHEMATIC DIAGRAMS * * * - * * 8- 1 8-1. Schematic Diagrams - - . - - 8- 1 8-2. General Notes . . . . . . . . . . 8- 1 8-4. Voltage and Resistance Diagram Notes 8- 1 8-5. Removing the Chassis - - * * * * - 8- 1 8-7. Tube Replacement - * - - * - * 8- 1 . . . . . . . . . . . . . ii 00081-2 1 i I i i 1 1 ! I ! i i I I 1 , I I i I I I 1 i i i i I i I ,I t ! i I 1 I 1 I ! i I i I i 1 i I I i Model 122A/AR List of Illustrations and Tables LIST OF ILLUSTRATIONS Number Title Page Number Title Page 1-1. Model 122A/AR Oscilloscope * - - * - - * * 1-0 4-1. Over-all Block Diagram + * * 4-1 3-1. Controls and Connectors - - * * * - - * - 3-2 3-2. Unbalanced Input * * - - * * * * 3-3 3-3. Difference Input - * * - * * * - * * - * 3-4 3-4. Balanced Input - * - * * * * * - - * * * 3-5 3-6. Chopped Operation * * * * * - - - * 3-7 3-7. Alternate Sweep Operation * * * * * * 3-8 3-5. Internal Sweep - Internal Synchronization * 3-6 3-8. Internal Sweep - External Synchronization 3-9 3-9. Vertical Balance Adjustment - * * 3-10 3-10. Vertical Sensitivity Calibration - * * * 3-11 3-11. Internal Sweep Magnification * - - - - * * 3-12 3-12. External Horizontal Input * - * - - 3-13 3-13. Intensity Modulation Operation - * * 3-14 3-14. Connection to Deflection Plates * * 3-15 Time. . . . . . . . . . . . . . . . . . . 3- 15. Connecting External Capacitors to Extend Sweep 3- 16 5- 1. 5-2. 7- 1. 8- 1. 8-2. 8-3. 8-4. 8- 5. 8-6. 8- 7. 8- 8. 8-9. Left-Side Adjustment Location Diagram * Right-Side Adjustment Location Diagram 5-4 - 5-6 Option 05 Graticule Lighting Schematic 7-2 Top View Adjustment Location and Voltage * 8-2 Bottom View Adjustment Location and Voltage * 8-3 Resistance Diagram - . * - - * . - - 5-4 Vertical Amplifier - - * * - * * * 8-5 Vertical Amplifier Switch Detail * 8-6 Horizontal Amplifier - * - * . * * - 8-7 Sweep Generator * * - - * - - * - * 8-8 Sweep Time - Horiz Sens Switch * - * * . 8-9 High Voltage Power Supply * * - Low Voltage and Filament Supplies * 8-10 Resistance Diagram * - * * * LIST OF TABLES Number Title Page Number Title Page 1-1. Specifications - * * * * - * * * 1-0 5-3. Horizontal Deflection Sensitivity . . . . - 5-2 2-1. Shipping Carton Test Strengths * *2-1 5-5. Low Voltage Power Supply Tolerances . * .5-4 5-4. Sweep Time Accuracy. . . . * . .5-3 3-1. Common Signal Limits * . . * -3-1 6-1. Reference Designators andAbbreviations * 6- 1 5-2. Vertical Deflection Sensitivity - . . 5-1 7-1. Manual Changes . . . . . . . . . . . . 6-2. Replaceable Parts. + . . . . - . . -6-2 7-1 ) 5-1. Required Test Equipment * . * * * . . 5-0 i 00081-3 iii Section I Figure 1-1 and Table 1-1 Model 122A/AR Figure 1- 1. Model 122A/AR Oscilloscope Table 1- 1. SDecifications SWEEP Sweep Range: 15 calibrated sweeps, from 5 psec/cm to 200 msec/cm, accurate to within 5%, in a 1 , 2, 5 sequence. Vernier permits continuous adjustment of sweep time between calibrated steps and extends the 200 msec/cm range to at least 0.5 sec/cm. Sweep Expand: X5 sweep expansion may be used on all ranges and expands fastest sweep to 1 psec/cm. Expansion is about the center of the CRT and expanded sweep accuracy is 5 10%. Synchronization: Automatic from 50 Hz to 250 kHz; internally from vertical deflection signals causing 1/2 cm or more vertical deflection; from external signals 2. 5 volts peak-to-peak or greater, and from line voltage. Trigger Point: Control overrides automatic and permits thetriggerpoint to be set between -10 and +10 volts. Turning fully counterclockwise into AUTO restores automatic operation. Posi- tive or negative slope may be selected on the INTernal trigger. Triggering in EXTernal is automatically established on the negative slope. IERTICAL AMPLIFIERS Bandwidth: DC coupled: DC to 200 kHz. AC coupled: 2 Hz to 200 kHz. Bandwidth is inde- pendent of calibrated sensitivity setting. Sensitivity: 10 mv/cm to 100 v/cm. 4 calibrated steps accurate within *3%, 10 mv/cm, 100 mv/cm, 1 v/cm, and 10 v/cm. Vernier per- mits continuous adjustment of sensitivity be- tween steps and extends 10 v/cm step to at least 100 v/cm. Internal Calibrator: Calibrating signal automatic- ally connected to vertical amplifier for stand- ardizing of gain. accuracv *2%. Input Impedance: 1 megohm, approximately50 pf shunt capacitance. Phase Shift: Vertical and horizontal amplifiers have same phase characteristics within *2 to 100 kHz when verniers are fully clockwise. Isolation: Greater than 80 db isolation between channels A and B from dc to 200 kHz. Balanced Input: On 10 mv/cm range on both amp- lifiers. Input impedance, 2 megohms shunted by approximately 25 pf. Common mode rejec- tion is at least 40 db. Common mode signal must not exceed +3 volts peak. switched to one channel to give differential in- put on all vertical sensitivity ranges. The sensitivity switches may be set separately to allow mixing signals of different levels. Com- mon mode rejection is at least 40 db with both switches on most sensitive ranges; 30 db on other ranges. Vertical Presentation: Switch selects: A ONLY, B ONLY, B-A, ALTERNATE or CHOPPED. Difference Input: Both input signals may be HORIZONTAL AMPLIFIER Bandwidth: DC coupled: DC to 200 kHz. AC coupled: 2 Hz to200 IrHz. pendent of calibrated sensitivity setting. Sensitivity: 0. 1 v/cm to 100 v/cm. 3 calibrated steps, accuratewithin *5%, 0.1 v/cm, 1 v/cm, and 10 v/cm. adjustment of sensitivity between steps and ex- tends 10 v/cm step to at least 100 v/cm. Input Impedance: Approximately 1 megohm shunted by 100 pf. Phase Shift: Horizontal and vertical amplifiers have same phase characteristics within *2 to 100 kHz. Bandwidth is inde- Vernier permits continuous -I, 0 00081-1 Model 122A/AR Section I Paragraphs 1-1 to 1-6 SECTION I G EN ERA1 IN FOR MATION 1-1. DESCRIPTION. 1-2. ure 1-1) is a dc to 200 kHz (kilocycle) dual-trace cathode-ray oscilloscope. It has accurately calibrated input sensitivity and sweep speed ranges. This oscil- loscope features dc-coupled differential amplifiers and dual trace operation. Differential amplifiers are useful since they reject the common mode (in-phase) part of the input while amplifying the differential (out-of-phase) part. For instance, they will reject hum pick up while amplifying the desired signal. In addition, using differential amplifiers has other advan- tages. Normally dc amplifiers are difficult to keep stable. Changes such as aging and changes of potentials cause this drift. However, these changes are of the common mode type and are rejected by differential amplifiers. Thus differential amplifiers are alsoused as stabilized dc amplifiers. 1-3. Dual trace operation is obtainedwith an electronic switch. This permits observation of two signals at the same time. The two signals may be viewed either alternately during consecutive sweeps or chopped on each sweep. Chopped operation involves switching rapidly between the two signals so that both appear The Hewlett-Packard Model 122A/AR (Fig- I to be traced simultaneously. The most useful type of presentation in each case will depend upon the fre- quencies involved. Generally, chopped operation is used with low frequency signals. These signals may also be viewed separately or with their difference (B-A) displayed on the screen. complete-specifica- tions for the Model 122A/AR are given in Table 1-1. 1-4. CATHODE-RAY TUBE. 1-5. The Model 122A/AR uses an internal graticule CRT which eliminatesparallax error in observing the display. The CRT is equipped with a nonglare safety face plate. 1-6. A type P31 aluminizedphosphor CRT is normal- ly furnished with the Model 122A/AR, however, P2 phosphor (general purpose), P7 phosphor (long per- sistence) with amber filter, and P11 (fastwriting rate). are also available at no extracost. An external grati- cule which is edge-lighted with controlled illumination is available under Option 05 (see Table 1-1, Specifications). Table 1- 1. Specifications (Contd) GENERAL Rack Mount: As Shown. Cathode Ray Tube: 5AQP31 mono-accelerator, normally furnished. Other phosphors available, see Modifications. Accelerating potential 3000 volts. Internal Graticule (standard): 10 cm x 10 cm, marked in cm squares with axes in 2 mm subdivisions. Eliminates parallax error. External Graticule (see Modifications): Edge- lighted with controlled illumination, 10 cm x 10 cm marked in cm squares. Major horizontal and vertical axes have 2 nim subdivisions. Color of filter compatible with CRT phosphor supplied: Green with P31 and P2, Amberwith Pi, Blue with P11. mount for oscilloscope camera. via terminals on rear. Sensitivity approxi- mately 20 v/cm. CRT Phosphors: (Specify by phosphor numbe Intensity Modulation: Terminals on rear. +20 v P2, P7 with amber filter, P1 pulse will blank trace of normal intensity. Cabinet Mount: Net, 35 lbs (15, 8 kg). Shipping, 05: External graticule with P31 phosphor 45 lbs (20, 3 kg). (specify P2, P7, or P11 if required). Rack Mount: Net, 34 lbs (11, 3 kg). Shipping, 06: Rear terminals in parallel with front 49 lbs (22 kg). terminals. Three 3-pin A/N connectors for Power: 115 or 230 volts +lo%, 50 to 1000 Hz; vertical inputs and horizontal/external trig- approximately 150 watts. ger input. (Mating A/N connectors included. Dimensions: Special order: For single sweep operation Cabinet Mount: 9-3/4 in. (248 mm) wide, 15 in. (310 mm)high, 21-1/4 in. (540 mm)deep. 122 AR CRT Bezel: Light-proof bezel provides firm ,. CRT Plates: Direct connection to deflection plates Modifications: P31 Standard. available, no charge. Weight: Options: (Specify by option number. ) specify H15-122A (cabinet) or H15-122AR (rack mount). oooa 1-4 1-1 Section I F.ragraphs 1-7 to 1-14 1-7. CATHODE-RAY TUBE WARRANTY. 1-8. The CRT usedin the Model 122A/AR is covered by a warranty separate from the instrument warranty. The CRTwarranty is included at the back of the manual for youruse in the event of CRT failure during the war- ranty period listed therein. 1-9. ACCESSORY AVAILABLE. 1-10. A Model 10175B Viewing Hood is available at extra cost. This is a face-fitting molded rubber hood used to shade the face of the CRT under high ambient light conditions. It will permit the use of lower beam intensity setting. 1-11. MANUAL IDENTIFICATION. Model 122A/AR 1- 12. Information in this manual applies directly to Model 122A/ARinstruments with serial prefix of 52 1-. The serial prefix is the first 3 digits of the eight digit serial number (000-00000) used to identify each Hewlett-Packardxstrument. I f the serial prefix of a Model 122A/AR is not 521-, a change sheet supplied with the manual, or Appendix I will define the differ- ence between that Model 122A or 122AR and the one described in this manual, or a different manual may provide the information. Corrections to this manual due to any errors which existed when this manualwas printed, are called Errata and appear only on the change sheet supplied. For information pertaining to change sheets, contact the nearest Hewlett-Packard Sale s/Service off ice. 1-13. SCOPE OF MANUAL. 1- 14. This manual supplies operating and maintenance instructions for the Model 122A/AR Oscilloscopes. Directions are given for the Cabinet Model 122A, but are the same for the Rack Model 122AR The locations of the controls on the front panel are different, but their functions are the same. 1-2 00081-3 Model 122A/AR up to 10 10 to 30 30 to 120 120 to 140 Section I1 Paragraphs 2-1 to 2-17 200 275 350 500 SECTION II I N STA 11 AT1 0 N 140 to 160 2-1. INITIAL INSPECTION. 2-2. MECHANICAL CHECK I f external damage to the shipping carton is evident, ask the carriers agent to be present when the instrument is unpacked. Check the instrument for external damage such as broken controls or connectors, and dents or scratches on the panel surface. I f damage is evident, see Paragraph 2-4 for recommendedclaim procedure and repackaging information. If the shipping carton is not damaged, check the cushioning material and note any signs of severe stress as a