HP-683C-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 P ! 3 J 01130-1 OPERATING A N D SERVICE M A N U A L MODEL 6a3c SWEEP OSCILLATOR SERIALS PREFIXED: 110 - C o p y r i g

2、 h t HEWLETT-PACKARD C O M P A N Y 1961 1501 PAGE MILL R O A D , P A L 0 ALTO, C A L I F O R N I A , U.S.A. Printed: O m 1961 RadioFans.CN 收音机爱 好者资料库 I Model 683C Specifications SPECIFICATIONS FREQUENCY RANGE: SWEEP RANGE: RF SWEEP RATE OF CHANGE: SWEEP TIME: POWER OUTPUT: POWER VARIATION: RESIDUAL

3、FM: SPURIOUS SIGNAL: MAXIMUM SWR: OUTPUT CONNECTOR: SWEEP MODE: SWEEP OUTPUT: SWEEP WIDTH: FREQUENCY DIAL ACCURACY: RESIDUAL AM: MODULATION: POWER: DIMENSIONS: WEIGHT: 2 to 4 kmc (gc) 2.1 mc to 2.1 kmc (gc) in 7 steps. Continuous control between steps. 16 mc/sec to 160 kmc (gc)/sec in 9 steps 0.0135

4、 sec to 135 sec for full band sweep; determined by sweep range and rate. Adjustable; 0 to at least 30 mw into 50-ohm load With leveler operating: less than f 1.5 db over entire frequency range. With leveler off: less than externally triggered (20 volts positive with better than 3 volts/psec rate of

5、rise); manually triggered. RF Frequency sweep is linear with respect to time and is downward from frequency dial setting. +25 volt (approximately) peak sawtooth provided concurrently with swept rf output for recorder and oscilloscope sweep. Source impedance 10,000 ohms and 20 pf in parallel. Accurac

6、y: 10% for full band sweep. greater for other calibrated sweep widths. Linearity: The half-voltage point of the SWEEP OUTPUT occurs within 5% of mid-frequency. . +25%, -15% or -20 volts or more reduces rf output level from rated cw output to zero. Input impedance: 750K ohms and 25 pf (approximately)

7、 in parallel. External FM: Approximately 150 volts peak-to-peak required to modulate full frequency range, 10 cps to 60 cps, Frequency deviation and modulating voltage must be decreased with modulating frequencies higher than 60 cps. Input impedance; 43K ohms and 100 pf (approximately) in parallel;

8、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 decay times less than 1 psec. Input impedance: 390K ohms and 25 pf (approximately) in parallel; ac coupl6d. 115 or 230 volts f lvo, 50 to

9、60 cps approximately 540 watts Cabinet Mount: 20-9/16 inches wide, 12-3/4 inches high, 18 inches deep Rack Mount: 17-5/8inches wide, 10-1/8 inches high, 16-5/8 inches deep Cabinet Mount: Net 105 lbs, shipping 134 lbs Rack Mount: Net 105 lbs, shipping 134 lbs 0 1130- 1 iii RadioFans.CN 收音机爱 好者资料库 Tab

10、le of Contents List of Tables Model 683C TABLE OF Section Page I GENERAL INFORMATION 1.1 . Description . . . . . . . . . . . 1-1 1.2 . Instrument Cooling System. . . . 1-1 1.3 . Three-Conductor Power Cable . . 1-1 1.4 . 230-Volt Operation . . . . . . . 1-2 1.5 . Rack Mounting Instructions . . . 1-2

11、1.6 . BWOTube Information . . . . . 1-3 I1 OPERATING INSTRUCTIONS 2.1 . Contents . . . . . . . . . . . . 2.2 . Installation . . . . . . . . . . . 2.3 . Turn-On Procedure . . . . . . . 2.4 . 2.5 . 2.6 . 2.7 . Using the Sweep Oscillator as Sweep Operation of the Oscillator . Amplitude Modulating the O

12、scillator Frequency Modulating the Oscillator a CW Signal Source . . . . . . 2.8 . Application . . . . . . . . . . 111 THEORY OF OPERATION 3- 1 . Contents . . . . . . . . . . . . 3.2 . Backward-Wave Oscillator Tube . 3.3 . Reference Circuit . . . . . . . 3.4 . Amplitude Modulator . . . . . . 3.5 . H

13、elix Modulator . . . . . . . . . 3.6 . Linear Sweep Generator . . . . . 3.7 . Helix Supply Reference Voltage and Exponential Voltage Generators . 3.8 . Regulated Power Supplies . . . . Magnet Current Supply (Regulated) RF Leveler and Anode 3.9 . 2- 1 2-1 2- 1 2-2 2-2 2-2 2-2 2-8 3- 1 3-1 3-3 3-4 3-5

14、 3-5 3-8 3-10 3-11 CONTENTS Section IV MAINTENANCE 4.1 . 4.2 . 4.3 . 4.4 . 4.5 . 4.6 . 4.7 . 4.8 . 4.10 . 4.11 . 4.12 . 4.13 . 4.14 . 4.15 . 4.16 . 4.17 . 4.18 . 4.19 . 4.20 . 4.21 . General . . . . . . . . . . . General Precautions . . . . . Air Filter . . . . . . . . . . Cabinet Removal . . . . .

15、. . Quick-Check Procedure . . . . Maintenance Test Equipment Required . . . . . . . . . Magnet Supply (Regulated) . . . -150 Volt Regulated Supply . . Helix Supply . . . . . . . . . . Filament Regulated . . . . . . Page 4-1 4-1 4-2 4-2 4-2 4-6 4-6 4-7 4-7 4-9 Measurement of Linear SweepTimes 4-9 Rep

16、lacement of BWO Tube. and Calibration Procedure . . . RF Sweep Linearity . . . . . Square-Wave Generator . . . . RF Leveler and Reference Anode Voltage Adjustment . . . . . Servicing the Sweep Circuits . . Replacing Neon DC Coupling Elements . . . . . . . . . Positioning Frequency Dial on Potentiome

17、ter Shaft . . . . . Tube Replacement . . . . . . Troubleshooting Procedure . . V REPLACEABLE PARTS 5.1 . Introduction . . . . . . . . . 5.2 . Ordering Information . . . . . LIST OF TABLES Number Title Page 1.1 . Electronic Sweep Oscillators . . . . . . . . 1-1 RF Sweep . . . . . . . . . . . . . . 3-

18、9 3.1 . Condition of Tubes During CW and 4 . 1 . Tube Replacement Chart . . . . . . . . . . 4 . 23 4.2 . Troubleshooting Procedure . . . . . . . . . 4-24 4-10 4-14 4-15 4-15 4-17 4-19 4-19 4-22 4-22 5-1 5-1 c 5.1 . Replaceable Parts . . . . . . . . . . . . . 5-1 iv 01130-1 Model 683C List of Illustr

19、ations LIST OF ILLUSTRATIONS Number Title Page 1.1 . Warranty Sheet . . . . . . . . . . . 1-2 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 . Turn-On Procedure and CW Operation . Using the Sweep Oscillator as a CW Signal Source . . .

20、 . . . Internal Sweep Modulation . . . . . . Internal Square-Wave Modulation . . . External Pulse Modulation . . . . . . External Amplitude Modulation . . . . External Frequency Modulation . . . . Allowable External Frequency Suitable Setup for Measuring Modulation Voltage Amplitude vs Modulation Vo

21、ltage Frequency . . . Frequency Deviation Limits when using External FM . . . . . . . . Input and Output Connector Characteristics . . . . . . . . . . 2-0 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 Backward- Wave Oscillator Tube Construction . . . . . . . . 3-1 Block Diagram Model 683C Sweep Oscillator .

22、. . . . . . . . . 3-2 RF Leveler Detected Waveform (Leveled and Unleveled Positions) . . 3-3 Adjustable Segments of Compensated Helix Voltage . . . . 3-3 RF Leveler Circuit . . . . . . . . . 3-4 Amplitude Modulation EXT . Position . 3-5 Simplified Schematic of Sweep Circuit . 3-7 Simplified Schemati

23、c of Exponential Sweepcircuit . . . . . 3-8 Frequency Modulator Waveforms . . . 3-6 Number Title Page 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 . 4.21 . 4.22 . 4.23 . 4.24 . 4.25 . 4.26 . Measuring RF Power Output

24、 . . . . . General Performance . . . . . . . Setup for Measuring Residual AM . . . Measuring Magnet Circuit Ripple . . . Model 683C Top View . . . . . . . . Sweep Output Voltage . . . . . . . . Model 683C Bottom View . . . . . . . Model 683C Rear View . Positioning the BWO Tube at the Front and Rear

25、 of Magnet . . . . . . Calibration Pips on CRO Sweep . . . . Example of Calibration Pips on CRO Sweep . . . . . . . . . . . . Crystal Detector-Attenuator Response Curve . . . . . . . . . RF Leveler Circuit Board . . . . . . RF Leveler Calibration Setup . . . . . Model 683C Right Side View Model 683C

26、 Left Side View . . . . . . Sweep Output Voltage Linearity . . . . Troubleshooting Chart . . . . . . . . (Current Regulated) . . . . . . . . Checking Frequency Calibration and . . . . . Magnet Power Supply Regulated Primary Power and Magnet Current Supply . . . . . . . Regulated +300 and -150 Volt P

27、S . . . Frequency Supply and Low Voltage PS . RF Power Leveler and Amplitude Modulator and Anode Section Exponential and Linear Sweep Gen . . Amplitude Modulator . . . . . . . . Frequency (Helix) Modulator . . . . . 4-2 4-3 4-5 4-7 4-8 4-9 4-12 4-12 4-13 4-14 4-15 4-16 4-18 4-19 4-20 4-21 4-22 4-28

28、4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 01130-1 V Model 683C * MODEL 683C ELECTRONIC SWEEP OSCILLATOR This manual specifically describes Model 683C of the TllO series, and in general describes all 683C sweep oscillators. If, however, the serial number of your instrument is prefixed by TO24 or T044,

29、there are parts of themanual 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 includes schematics, parts list, and replacement paragraphs and illustrations

30、 for those items in the manual that do not describe your instrument. The supplementary data is indexed; paragraph and figure numbers are the same as those used in the manual for the corresponding information. If it is necessary to order replacement parts, consult the supplementary parts list first.

31、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 01 130- 1 Model 683C ( $ 9 Model 682C 683C 684C H01 686C 686C 687C Section T Paragraphs 1-1 to 1-3 Frequency Range 1.0 to 2.0 kmc (gc) 2.0

32、to 4.0 kmc (gc) 4.0 to 8.1 kmc (gc) 7.0 to 11.0 kmc (gc) 8.2 to 12.4 kmc (gc) 12.4 to 18.0 kmc (gc) SECTION I GENERAL INFORMATION 1-1. DESCRIPTION. The Model 683C Sweep Oscillator is one of several ( $ 3 Electronic Sweep Oscillators which cover major microwave bands as shown in table 1-1. Table 1-1.

33、 Electronic Sweep Oscillators Sweep oscillators are used as signal sources for a wide variety of laboratory and production tests. They provide a high-level relatively constant-amplitude signal that can be rapidly changed in frequency. Thus they permit the characteristics of microwave systems or comp

34、onents to be quickly checked over an entire band of frequencies. The Model 683C Sweep Oscillator covers the com- plete S band from 2 to 4 kmc (gc) and uses a backward wave oscillator (bwo) tube to generate the rf signal. The bwo tube has several advantages over previously used klystron type microwav

35、e oscillator tubes when used in sweep sources. The bwo tube output frequency and power level are determined by the values of applied voltage only. There are no cavity or reflector voltages to adjust or track. There is no tendency to switch modes of oscil- lation. Since frequency and power-level adju

36、stments are electronic, all mechanical problems associated with tunable-cavity Hystron-type oscillators are elim- inated. Control of frequency and power level are simple, positive, and straightforward. By use of an rf leveler circuit, which programs the r f power out- put from the bwo input, power v

37、ariations of i1.5 db are realized, With the rf leveler inoperative, output power from the bwo is kept constant within 6 db, but full power from the bwo tube is obtained. The rf output power is adjustable from 0 to a maximum which is not less than 30 milliwatts. The Model 683C Sweep Oscillator is ver

38、satile. The output can be either cw or amplitude modulated. An internal square-wave source provides square-wave modulation at any frequency between 400and 12OOcps. The instrument can be externally pulse modulated or 0 1 130- 1 amplitude modulated by sine or complex waveforms at any percentage from 0

39、 to lOC%. In addition the oscillator can be externally frequency modulated or swept in frequency over any portion or all of the 2- to 4-kmc (gc) range, or if desired the 683C can be simul- taneously amplitude and frequency modulated. When used for its primary purpose as a sweep oscil- lator, the int

40、ernal circuitry provides an extremely wide choice of sweeping rates and bandwidth swept. The rate of change of frequency is linear with time and adjustable in calibrated steps from 16 mc/sec to 160 kmc(gc)/sec. The frequency range swept can be as small as 2.1 mc or as wide as 2.1 kmc (gc), as select

41、ed by the calibrated seven position A FRE- QUENCY switch. In addition, there is a VERNIER control associated with the A FREQUENCY switch which gives continuous adjustment between the fixed positions . The minimum sweep time of the Model 683C is 13.2 milliseconds. The sweep time is determined by the

42、combined settings of the RF SWEEP RATE and the A FREQUENCY switches. These switches are inter- locked by a differential gear drive which automatically prevents any combination which would produce a sweep time less than 13.2 milliseconds. The swept rf output frequency from the oscillator is linear wi

43、th time and, by adjustment of the SWEEP SELECTOR switch, can be made recurrent or set for single sweeps. Single sweeps are started either by the front-panel pushbutton or by an external positive pulse (rise time greater than 3 volts per microsecond). In addition, a sawtooth voltage of approximately

44、25 volts is provided concurrent with each rf sweep to supply a linear time base for an oscilloscope or X-Y recorder. 1-2. INSTRUMENT C O O L I N G SYSTEM. The instrument is forced-air cooled by a high velocity fan system. The incoming air is filtered to remove excessive dust. This filter must be ins

45、pected fre- quently to insure that it is not clogged with dirt. A dirty filter may restrict air flow sufficiently to cause excessive heating of the instrument which can cause early component failure (see figure 4-3). 1-3. THREE-CONDUCTOR POWER CABLE. To protect operating personnel, the National Elec

46、trical Manufacturers Association (NEMA) recommends that the instrument panel and cabinet be grounded. All Hewlett-Packard instruments are equipped with a three-conductor power cable which, when plugged into an appropriate receptacle, grounds the instrument. The offset pin on the power cable three-pr

47、ongcon- nector is the ground pin. 1-1 Section I Paragraphs 1-4 to 1-5 To preserve the protection feature when operating the instrument from a two-contact outlet, use a three- prong to two-prong adapter and connect the green pigtail on the adapter to ground. Model 683C 1-4. 230-VOLT OPERATION. The Mo

48、del 683C is usually shipped wired for 115 vac operation, but is quickly and easily converted to operation from a nominal 230-volt 50/60 cps source. To convert, remove two jumpers between terminals A2 and A3. In addition, remove the jumper wire (connecting the two rear terminals of the MAGNET 3 AMP a

49、nd H. V. 3 AMP. fuses) from the rear ter- minal of the H.V. fuse and reconnect to the side ter- minal of the H.V. fuse. This side terminal also has a pink lead attached to it. Do not change the size of either the MAGNET fuse or the H.V.fuse. When operating from a 230-volt source, T101, the magnet supply and the fan o