HP-686C-Manual 电路图.pdf

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1、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 MODEL 686C SWEEP OSCILLATOR SERIALS PREFIXED: 110- OPERATING AND SERVICING MANUAL RadioFans.CN 收音机爱 好者资料库 OPERATING A

2、ND SERVICING MANUAL MODEL 6a6c SWEEP OSCILLATOR SERIALS PREFIXED: 110- WWW.HPARCHWE.COM For Free Distribution Only Copyright HEWLETT-PACKARD COMPANY I961 1501 PAGE MILL ROAD, PAL0 ALTO, CALIFORNIA, U. 5. A. 00034-1 Printed: 6/61 RadioFans.CN 收音机爱 好者资料库 Model 6869 Specifications SPECIFICATIONS FREQUE

3、NCY RANGE: SWEEP RANGE: RF SWEEP RATE OF CHANGE: SWEEP TIME: POWER OUTPUT: POWER VARIATION: RESIDUAL FM: SPURIOUS SIGNALS : MAXIMUM SWR: SWEEP MODE: SWEEP OUTPUT: SWEEP WIDTH: FREQUENCY DIAL ACCURACY: RESIDUAL AM: MODULATION: POWER DIMENSIONS: OUTPUT CONNECTOR: WEIGHT: 8.2 to 12.4 kmc 4.4 mc to 4.4

4、kmc in 7 steps. Continuous control between steps 32 mc/sec to 320 kmc sec in 9 steps .0139 sec to 139 sec for full band sweep; determined by sweep range and rate Adjustable; 0 to at least 10 mw into matched load (swr - 1.25) With leveler operating: less than +l. 25 db over entire frequency range. Wi

5、th leveler off: less than +l. 5 db over the entire fre- quency range Less than 200 kc peak At least 30 db below cw output 2 or less Recurrent; externally triggered (20v positive with better than 3v/usec rate of rise); manually triggered. RF Frequency sweep is linear with respect to time and is downw

6、ard from frequency dial setting Approximately +25v peak sawtooth provided concurrently with swept rf output for recorder and oscilloscope sweep. Source impedance 10K ohms and 20 pf in parallel Accuracy: *lo% for full band sweep. +25% -15% or *3 mc, which- ever is greater for other calibrated sweep w

7、idths Linearity: The half-voltage point of the SWEEP OUTPUT occurs with 5% of mid-frequency +l% Greater than 40 db below carrier amplitude Internal AM: Square-wave modulation continuously adjustable from 400 to 1200 cps. Peak rf output power is within 1 db of the cw level External AM: Direct coupled

8、 dc to 300 kc/sec; -20 volts or more reduces rf output level from rated cw output to zero. Input imped- ance: 750K ohms and approximately 25 pf in parallel External FM: Approximately 150 volts peak-to-peak required to modulate full frequency range. 10 cps to 60 cps. Frequency devia- tion and modulat

9、ing voltage must be decreased with modulating frequencies higher than 60 cps. Input impedance: 43K ohms and approximately 100 pf in parallel; ac coupled External Pulse: +10 volts or greater pulse required;5 millisecond maximum pulse length. Peak rf pulse level within 1 db of cw level. Pulse rise and

10、 decay times less than 1 usec. Input impedance: lOOK ohms and approximately 45 pf in parallel; ac coupled 115/230 volts *lo%, 50 to 60 cps,approximately 540 watts Cabinet Mount: 20-9/16 in. wide, 12-3/4 in. high, 18 in. deep Rack Mount: 17-5/8 in. wide, 10-1/8 in. high, 16-5/8 in. deep X-Band Cover

11、Flange (UG- 135/U) Cabinet Mount: Net 105 lbs, shipping 134 lbs Rack Mount: Net 105 lbs, shipping 134 lbs 00034- 1 iii Table of Contents List of Tables Model 686C TABLE OF CONTENTS Section Page I GENERAL INFORMATION 1- 1 . General Information . 1-1 1.2 . Instrument Cooling System . 1-1 1.3 . Three C

12、onductor Power Cable . 1-1 1.4 . 230 Volt Operation . 1-2 Tube Information . 1-2 1.5 . Rack Mounting Instructions . 1-2 1.6 . Backward- Wave Oscillator I1 OPERATING INSTRUCTIONS 2.1 . Contents . 2-1 2.2 . Installation . 2-1 2.3 . Turn-On Procedure . 2-1 2.4 . Using the Sweep Oscillator as a CW Signa

13、l Source . 2-5 2.5 . Sweep Operation of the Oscillator . 2-5 2.6 . Amplitude Modulating the Oscillator . 2-5 2.7 . Frequency Modulating the Oscillator . 2-5 2.8 . Applications . 2-9 1 1 1 THEORY OF OPERATION 3.1 . Contents . 3-1 3.2 . Backward-Wave Oscillator Tube . 3-1 3.3 . RF Leveler and Referenc

14、e Anode Circuit . 3-3 3.4 . Amplitude Modulator . 3-4 3.5 . Frequency Modulator . 3-5 3.6 . Linear Sweep Generator . 3-7 3.7 . Helix Supply Reference Voltage and Exponential Voltage Generators . 3-8 3.8 . Regulated Power Supplies . 3-10 Section Page III THEORY OF OPERATION (Contd) 3.9 . Magnet Curre

15、nt Supply (Regulated) . 3-11 3- 10 . How a Helix Backward-Wave Tube Works . 3-11 IV MAINTENANCE 4-1 . General . 4-1 4.2 . General Precautions . 4-1 4.3 . Air Filter . 4-2 4.4 . Cabinet Removal . 4-2 4.5 . Maintenance Test Equipment Required 4-2 4.6 . Quick-Check Procedure . 4-2 4.7 . Regulated Magne

16、t Supply . 4-6 4.8 . -150 Volt Regulated Supply . 4-7 4.9 . +300 Volt Regulated Supply . 4-7 4- 10 . Helix Supply . 4-7 4.11 . Filament Regulation . 4-9 4- 12 . Measurement of Linear Sweep Times 4-9 4.13 . Replacement of BWO Tube and Calibration Procedure . 4-10 4- 14 . RF Sweep Linearity . 4-13 4.1

17、5 . Square-Wave Symmetry Adjust . 4-15 4.16 . RF Leveler and Reference Anode Voltage Adjustment . 4-15 4.18 . Replacing Neon DC Coupling Elements . 4-21 4.19 . Positioning the Frequency Dial on the Potentiometer Shaft . 4-21 4.20 . Tube Replacement . 4-22 4-17 . Servicing the Sweep Circuits . 4-17 V

18、 REPLACEABLE PARTS 5.1 . Introduction . 5-1 5.2 . Ordering Information . 5-1 LIST OF TABLES Number Title Page 1.1 . Electronic Sweep Oscillators . 1-1 3.1 . 3-8 4.1 . Tube Replacement Chart . 4-22 4.2 . Troubleshooting Procedure . 4-23 5- 1 . Replaceable Parts . 5-1 Conditions of Tubes during CW and

19、 RF Sweep . 1. iv 00034- 1 Model 686C List of Illustrations Number LIST OF ILLUSTRATIONS Title Page Number Title 2- 1. 2-2. 2-3. 2-4. 2- 5 . 2-6. 2-7. 2-8. 2-9. 2- 10. 3-1. 3-2. 3-3. 3-4. 3- 5. 3-6. 3-7. 3-8. 3-9. 3- 10. 3-11. 3-12. 3-13. 3- 14. 3-15. 3-16. 00034- 1 Turn-On Procedure and CW Operatio

20、n Using the Sweep Oscillator as a Signal Generator . . . . . . . . . . . . . . . . . Internal Sweep Modulation. . . . . . . . . . . Internal Square- Wave Modulation. . . . . External Pulse Modulation. . . . . . . . . . . External Amplitude Modulation. . . . . . . External Frequency Modulation . . .

21、. . . Allowable External Deviation Limits vs ModulationVoltage Frequency. . . . Suitable Setup for Measuring Frequency Deviation Limits whenusing FM . . . . Input and Output Connector Characteristics . . . . . . . . . . . . . . . . . . Backward- Wave Oscillator Tube Construction. . . . . . . . . . .

22、 . . . . . . . . . . Block Diagram Model 686C Sweep Oscillator . . . . . . . . . . . . . . . . . . . . . . . Detected Waveform. . . . . . . . . . . . . . . . . Adjustable Segments of Compensated Helix Voltage . . . . . . . . . . . . . . . . . . . . RF Leveler Circuit. . . . . . . . . . . . . . . . A

23、mplitude Modulation EX”. Position . Frequency Modulator Waveforms . . . . Simplified Schematic of Linear Sweep Generator . Simplified Schematic of the Exponential Sweep Generator . . . . . . Backward-Wave Oscillator Tube . . . . . A Single Regenerative Loop . . . . . . . . . A Chain of Regenerative

24、Loops . . . . . . Cross Section of Helix Electron Beam and Helix Wave. . . . . . . . . . . . Axial Electric Field of Helix Wave which provides Velocity Modulation and Bunching of Electron Beam . . . . Helix Showing Bunching of Electron Beam . Relative Amplitude of the Helix Wave and the Degree of El

25、ectron Bunch- ing along Helix. . . . . . . . . . . . . . . . . . 2-2 2- 3 2-4 2- 5 2-6 2-7 2-8 2-9 2-9 2-10 3- 1 3-2 3- 3 3- 3 3-4 3- 5 3-6 3-7 3-8 3-12 3- 12 3- 12 3-13 3- 13 3- 13 4- 1 . 4-2. 4-3. 4-4. 4- 5 . 4-6. 4-7. 4-8. 4-9. 4- 10. 4-11. 4-12. 4- 13. 4- 14. 4-15. 4-16. 4- 17. 4-18. 4- 19. 4-20

26、. 4-21. 4-22. 4-23. 4-24. 4-25. 4-26. Measuring RF Output. . . . . . . . . . . . . . Checking Frequency Calibration and General Performance . . . . . . . . . Setup for Measuring Residual AM . . . . Measuring Magnet Circuit Ripple . . . . Model 686C Top View. . . . . . . . . . . . . . Sweep Out Volta

27、ge. . . . . . . . . . . . . . . . . Model 686C Bottom View. . . . . . . . . . . Model 686C Rear View. . . . . . . . . . . . . Positioning the BWO Tube at Front and Rear of Magnet. . . . . . . . . . . . . . . Calibration Pips on CRO Sweep (Linearity) . . . . . . . . . . . . . . . . . . . . . . Calibr

28、ation Pips on CRO Sweep (Length) . Crystal Detector- Attenuator Response Curve . RF Leveler Circuit Board. . . . . . . . . . RF Leveler Calibration Setup. . . . . . . . Model 686C Right Side View . . . . . . . . . Model 686C Left Side View. . . . . . . . . , Sweep Out Voltage Linearity. . . . . . .

29、. Troubleshooting Chart . . . . . . . . . . . . . . Magnet Power Supply (Current Regulated) . . . . . . . . . . . . . . . . . . . . . . . Primary Power and Regulated Magnet Supply . Regulated +300 and -150 Volt Power Supplies . . . . . . . . . . . . . . . . . . Low Voltages and Regulated Helix Suppl

30、y . RF Power Leveler and Amplitude Modulator . . . . . . . . . . . . . . . . . . . . . . . Amplitude Modulator and Reference Anode Circuit. . . . . . . . . . . . . . . . . . . Frequency (BWO Helix) Modulator . . . Linear and Exponential Sweep Generator Circuit . . . . . , . . . . . . . . . . Page 4-

31、3 4-4 4-6 4-6 4-8 4-9 4-11 4-11 4- 12 4- 14 4- 14 4- 16 4- 18 4-18 4-19 4-20 4-21 4-27 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 V Model 686C . MODEL 686C ELECTRONIC SWEEP OSCILLATOR This manual specifically describes 686Cs of the TllO series, and in general describes all 686C Sweep Oscillators. If, h

32、owever, the serial number of your instrument is prefixed by TO24 or T044, there are parts of the manual which do not apply to your instrument. If your instrument carries one of these serial numbers, information specific to your instrument is furnished with this manual. This supplementary material in

33、cludes schematics, parts list, and replacement paragraphs and illustrations for those items in the manualthat do not describe your instrument. The supplementary data is indexed; paragraphand figure numbers arethe same as those used in the manual for the corresponding information. If it is necessary

34、to order a replacement part, consult the supplementary parts list first. If the component is not listed, use the part number given in Section V of the manual; otherwise, always use the part number in your supplementary parts list. vi 00034- 1 BACKWARD W A V E OSCILLATOR TUBE WARRANTY CLAIMS A N D AD

35、JUSTMENT PROCEDURE FOR STEWART ENGINEERING C O M P A N Y TUBES SUPPLIED BY HEWLETT-PACKARD COMPANY CONDITIONS OF WARRANTY A backward wave oscillator tube manufactured by Stewart Engineering Company, Soquel, Cal- ifornia, is warranted by the manufacturer to be free of defects in material and workmans

36、hip for 18 months from the date of purchase from , or 500 hours filament life, whichever occurs first. Allowances for premature failure within 6 months from the date of shipment from will be pro- rated on the basis of remainingguaranteed filament life. Following the 6 month period, allowance for pre

37、mature failure will be pro-rated on the basis of remaining guaranteed filament life, or on the basis of months remaining in this 12 month period, whichever is the lesser credit. The Hewlett-Packard Company will process warranty claims for customers on Stewart back- ward wave oscillator tubes which w

38、ere supplied by as original equipment or replacements for instruments. All allowances by the manufacturer will be passed on to the customer. After expiration of this warranty, all replacement backward wave oscillator tubes should be obtained directly from Stewart Engineering Company, Soquel, Califor

39、nia. A Stewart backward wave oscillator tube returnable to the Hewlett-Packard Company under the conditions of this warranty must be packed and shipped according to instructions below, and must be accompanied by the Warranty Claim on the reverse side of this form. Any chronistor included in the inst

40、rument, must also be returned with the Warranty Claim. Please follow shipping instructions carefully to assure safe arrival of the backward wave oscillator tube since no allow- ance can be made on broken tubes. SHIPPING INSTRUCTIONS 1) Carefully wrap the backward wave oscillator tube in 1/4 inch thi

41、ck “kimpack”, cotton batting, or other soft padding material. 2) Wrap the above in heavy kraft paper. 3) Pack in a rigid container which is at least 4 inches larger than the tube in each direction. 4) Surround the tube with at least 4 inches of packed excelsior or similar shock absorbing material. B

42、e certain that the packing is tight all around the tube. 5) Tubes returned from outside the continental United States should be packed in a wooden box. 6) Mark container FRAGILE and ship prepaid via Air Freight or Railway Express. Do not ship via Parcel Post or Air Parcel Post since experience has s

43、hown that fragile items are more apt to be damaged when shipped by these means. 3/9/59 HEW LETT-PACKARD CO. PAGE MILL ROAD, PAL0 ALTO, CALIF. U.S.A. BACKWARD W A V E OSCILLATOR TUBE WARRANTY CLAIM IMPORTANT: - To expedite your claim, please answer all questions fully since a claim cannot be processe

44、d without adequate information. FROM: DATE: NAME COMPANY ADDRESS Person to contact for further information: TITLE COMPANY ADDRESS If instrument contains a chronistor please remove and attach below Check if instrument does 0 not contain chronistor Tube type Serial No. Tube used in Model Serial No. Tu

45、be is: Original Replacement Date tube received Date tube placed in service Date of tube failure Your Purchase Order No. Purchased from Hours service per day (average) No. of days in service Total filament operation hours SYMPTOMS: (Please describe nature of trouble) OPERATING CONDITIONS: (Please des

46、cribe conditions prior to and at time of failure) SIGNATURE . IF TUBE WAS NOT OBTAINED FROM HEWLETT-PACKARD COMPANY, PLEASE RETURN TUBE AND COM-TED FORM TO WHEREVER TUBE WAS PURCHASED. , Model 686C WWW.HPARCHIVE.COM For Free Distribution Only SECTION I GENERAL I N F O R M A T I O N 1-1. GENERAL DESCRIPTION. The Model 686C SweepOscillator is one of several Electronic Sweep Oscillators which together cover major microwave bands as shown in Table 1-1. Table 1- 1. Electronic Sweep Oscillators I Model I Frequency Range I 682C 683C 684C H