HP-240A-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 240A SWEEP SIGNAL GENERATOR 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 RadioFans.CN 收音机爱 好者资料库 - HEWLETT 1-PAC

2、KARD u CERTI FI CAT ION The Hewlett-Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory. The Hewlett- Packard Company further certifies that its calibration measurements are traceable t

3、o the U. S. National Bureau of Standards to the extent allowed by the Bureaus calibration facility. WARRANTY AND ASSISTANCE All Hewlett-Packard products are warranted against defects in materials and workmanship. This warranty applies for one year from the date of delivery, or, in the case of certai

4、n major components listed in the operating manual, for the specified period. We will repair or replace products which prove to be defective during the warranty period. No other warranty is expressed or implied. We are not liable for consequential damages. For any assistance contact your nearest Hewl

5、ett-Packard Sales and Service Office. Addresses are provided at the back of this manual. RadioFans.CN 收音机爱 好者资料库 OPERATING AND SERVICE MANUAL MODEL 240A SWEEP SIGNAL GENERATOR The 240A was in manufacture prior to the acquisition of Boonton Radio Company by the Hewlett-Packard Company in 1959. The fr

6、ont panel engraving continues to identify the original manufacturer of this instrument. WWW.HPARCHIVE.COM For Free Distribution Only Copyright Hewlett-Pockard Company 1965 Green Pond Road Rockowoy, New Jersey, U. 5. A. Printed: DEC 1965 Table of Contents Section I GENERAL . 1 . 1 . Introduction . 1-

7、4 . SuppliedAccessoq501B . 1 1 INSTALLATION . 2 . 1 . Introduction . 2 . 3 . Unpackingandbpection . 2 . 5 . Three-Conductor Power Cable . 2 . 8 . Idle Heater . 2.10 . Power Requirements . 2.16 . Repackaging for Shipment . m OPERATION . 3 . 1 . Panel Layout and Controls . 3-4 . Operating Instructions

8、 . 3 . 5 . Operational Checks . 3 . 7 . 3-10 RF Output Attenuators . 3.12 . Crystal Referenced Fre- 3.14 . Pip and Crystal Markers . 3.19 . Test Signal Amplifier . 3.21 . Amplitude Modulation . 3.23 . RF Blanking and Flatness . . 3.26 . Using the Sweep Signal Genera- tor . . . . . . . . . . . . . .

9、RF Oscillator and Amplifier . quencies . 3.29 . RFOutput . 3.31 . Test Signal In . . . . . . . . . . 3.33 . sweepout . 3.36 . Composite Signal Out . . . . . . N PRINCPLESOFOPERATION . 4 . l . Introduction . 4.3 . CW Signal Generator . 4 . 8 . Sweep Signal Generator . 4.13 . Reference Frequencies and

10、 Adder Stage . 4.18 . Pip Marker Generator . 4.21 . Power Supply . 4.23 . RF Oscillator and Reactors . ii Model 240A TABLE O F CONTENTS page 1-1 1-1 1 - 1 2 -1 2 -1 2 - 1 2 - 1 2-1 2-1 2-1 3 -1 3-1 3 -2 3 -2 3 -2 3-3 3 -3 3-3 3-4 3-4 3-4 3-4 3-4 3-4 3-4 3 -5 4 -1 4 -1 4 -1 4-2 4 -2 4 -2 4 -2 4 -3 Se

11、ction 4 .28 . 4.30 . 4.32 . 4.36 . 4-40 . 4-45 . 4-48 . 4.50 . 4.56 . 4.60 . 4.63 . Buffer Amplifier . Output Attenuator . Sweep Generator . Shaping Circuits . Automatic Leveling . RF Blanking . Marker Generator . Pip Marker Generator . Composite Signal Amplifier . . Power Supply . AmplitudeModulato

12、r . V MAINTENANCE . 5 . 1 . 5 . 3 . 5 . 5 . 5.7 . 5.11 . 5.12 . 5.13 . 5 .14 . 5.15 . 5.17 . 5.18 . 5.20 . 5.21 . 5 .23 . 5.27 . 5.28 . 5.29 . 5.30 . 5.32 . 5 .34 . 5.36 . 5.38 . 5-40 . Introduction . Test Equipment . Component Identification . Adjustments . Power Supply . Marker Amplifier Traps . M

13、arker Oscillators . Pip Markers . RF Output and AGC . Preliminary Frequency Ad- CWFrequency Calibration . . . Sweep Frequency Calibration . . Sweep Linearity . RF Level Meter . AM Calibration . Trouble Shooting and Repair . . Yoke and Range Switch Repair . Trouble Shooting Chart . Circuit Voltages .

14、 Waveforms . Marker Ambiguity . AGC Adjustment . justment . Tube Replacement . VI REPLACEABLE PARTS . 6 . 1 . Introduction . 6.3 . Ordering Information . Reference Designation Index . . page 4-3 4-3 4-3 4-4 4-4 4-5 4-5 4-5 4-6 4-6 4-6 5-1 5-1 5-1 5-1 5-1 5-1 5-2 5-2 5-2 5-2 5-3 5-3 5 -3 5 -3 5-3 5-5

15、 5-5 5-5 5-5 5 -5 5-5 5-5 5-6 5-6 6-1 6-1 6-1 6-2 Model 240A List of Illustrations List of Tables LIST OF ILLUSTRATIONS Number Title Page 1 . 1 . 3.1 . 3.2 . 3.3 . 3 4 . 4.1 . 4.2 . 4.3 . 4-4 . 4.5 . 4.6 . 4.7 . 4.8 . 4 . 9 . 4 -1 0 . 4.11 . 4.12 . 5.1 . 5 . 2 . 5.3 . 5 4 . 5 . 5 . 6.1 . 6 . 2 . Mod

16、el 240A Sweep Signal Generator . . 1-1 Front Panel Control Layout . . . . . . 3-0 RF Sweep Flatness . . . . . . . . . . . 3-4 Test Setup Using 501B Output Cable . . 3-4 Test Setup Using 501B Output Cable and 509B Attenuator . . . . . . . . . 3 4 Functional Block Diagram . 240A . . . 4-1 RF Oscillato

17、r . . . . . . . . . . . . 4-3 Output Attenuator System . . . . . . . . 4 4 RF Output Characteristics . . . . . . . 4-4 Sweep Control Waveforms . . . . . . . 4-4 RF Blanking - Block Diagram . . . . . 4-5 Crystal Markers - Block Diagram . . . 4-5 Composite Signal Amplifier . . . . . . 4-6 Power Supply

18、 - Block Diagram Buffer Amplifier and Diode Modulator . 4-3 Automatic Leveling-Block Diagram . . 4-5 Pip Markers . Block Diagram . . . . . 4-6 . . . . 4-7 Band 5 Linearity Presentation . . . . . 5-4 Linearity Limits . 5-4 Oscillator Tube Connections . . . . . 5-5 RF Unit Terminal Board . . . . . . .

19、 . 5-5 Setup for Pip Identification . . . . . . 5-6 Major Subassemblies . 6 -15 Power Supply Chassis (Top) . 6-15 Number 6.3 . 6-4 . 6 . 5 . 6 . 6 . 6.7 . 6 . 8 . 6 . 9 . Title Power Supply Chassis (Bottom) . Marker Chassis . . . . . . . . . . . Sweep Chassis . . . . . . . . . . . . Pip Chassis . Au

20、dio Chassis . RF Unit . Range Switch and Reactor Assembly . RF Unit. Audio Oscillator. Meter Circuit Schematic . Sweep and Pip Chassis Schematic . . Marker Chassis Schematic . Power Supply Schematic . Page 6-16 6-16 6-17 6-17 6-18 6-18 6-18 6-19 6-21 6-23 6-25 LIST OF TABLES Number Title Page 1-0 1

21、. 1 . Specifications . . . . . . . . . . . . . 3.1 . Control Settings for CW and Sweep Operation . . . . . . . . . . . . 3-3 5.1 . Recommended Test Equipment . . . . 5-0 5 . 2 . Component Identification . . . . . . . 5-0 5.5 . Trouble Shooting Chart 5-6 5.6 . Voltage Chart 5-8 Reference Designation

22、Index . 6-2 5.3 . CW Frequency Calibration . . . . . . 5-3 5 4 . Center Frequency Calibration . . . . 5-3 . . . . . . . . . . . . . . . . . . . . iii Model 240A Section I Table 1-1 Radio Frequency Characteristics RF RANGE: Total Range: 4.5 to 120 Mc. No. Bands: 5 Band Ranges: 4.5 - 9 Mc. 35 - 75 Mc.

23、 9 -18Mc. 75-120Mc. 18 -35Mc. RF ACCURACY: * l%* (after four hour warmup). *May be standardized against internal crystal to * 0.005 9 % . RF CALIBRATION: Increments of approximately 1%. RF OUTPUT: Range: 1 pv to 0.3 volts* (sweep). 1 pv to 0.1 volts* (CW inspect cabinet and panel surfaces for dents

24、and scratches. An operation check is given in Paragraphs 3-7 through 3-25. If instrument is damaged in any way or fails to operate properly, notify carrier immediately (see warranty statement on the inside front cover of this manual). assistance of any kind, including help with instru- ments under w

25、arranty, contact your Hewlett-Packard field office. Inspect instrument for shipping damage as For specified on the voltage plate will result in damage to the 240A. 2-13. For use on 220 volts, an external transformer (-hp- #9100-0401) must be used to drop the line voltage to the range of 105 to 125 v

26、olts. 2-14. 240AP is approximately 280 watts. Power consumption for either the 240A or 2-15. allows tube filaments to warm up before the applica- tion of plate voltage. A time delay switch with 30 seconds lag 2-5. THREE-CONDUCTOR POWER CABLE. 2-1 6. REPACKAGING FOR SHIPMENT. 2-6. Electrical Manufact

27、urers 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-prong connector i

28、s the ground wire. To protect operating personnel, the National 2-7. 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. To preserve the protection feature when 2-1 7. for shipment. If you have any questio

29、ns, contact your local -hp- Sales and Service Office (see lists at rear of this manual). The following is a general guide for repacking a. Place instrument in original container if avail- able. If original container is not available, it can be purchased from your nearest -hp- Sales and Service Offic

30、e. If original container is not used: b. Wrap instrument in heavy paper or plastic be- fore placing in an inner container. 2-8. IDLE HEATER. c. Use plenty of packing material around all sides of instrument and protect panel faces with cardboard 2-9. In the off position of the power switch, a strips.

31、 30-watt heater is turned on in the RF Unit to maintain a near-operating temperature in the frequency deter- d. mining circuitry to reduce required warmup time when the 240A is turned on. Place instrument and inner container in a heavy carton or wooden box and seal with strong tape or metal bands. 2

32、-10. POWER REQUIREMENTS. 2-11. The Model 240A contains a voltage stabilizer to regulate some internal voltages. Since the per- formance of the stabilizer is based on a rated power line frequency, the line voltage and frequency rating shown on the plate above the power receptacle on the rear of the c

33、abinet must be observed. 2-12. power line sources only: The 240A is available for use on the following e. Mark shipping container with Delicate Instru- ment, Fragile, etc. NOTE: If the instrument is to be shipped to Hewlett - Packard for service or repair, attach to the instrument a tag identifying

34、the owner and indicate the service or re- pair to be accomplished; include the model number and serial number of the instru- ment. In any correspondence, identify the model and serial numbers 2-1 Section I C I Figure 3-1 Model 240A Figure 3-1. Front Panel Control Layout 3-0 Model 240A Section I11 Pa

35、ragraphs 3-1 to 3-3 SECTION 111 OPERATION 3-1. PANEL LAYOUT AND CONTROLS. 3-2. a given function are grouped, with those controls most frequently used given preferred locations. A meter provides good readability of the output func- tions of the generator. All cable connections in and out of the instr

36、ument are located along the bottom of the front panel. The front view of the Sweep Signal Generator Model 240A, Figure 3-1, shows the various controls, meters and measuring circuit connections. The four controls associated with operation as a sweep generator are grouped on the right side and the con

37、trols for the two Marker Systems are grouped on the left. Power controls and indicators are cen- trally located near the bottom of the instrument. All connections into and out of the generator are grouped along the bottom of the cabinet; inputs on the left, outputs on the right. On the front panel,

38、all controls associated with 3-3. nations are shown within quotation marks: In the following description, front panel desig- 1. CENTER FREQUENCY DIAL The five-band frequency dial, visible in the upper right hand window, indicates the center frequency of the output signal in megacycles. The red circl

39、e on the fiducial line indicates the active range. total range of 4.5 - 120 mc is covered in five ranges of 4.5-9, 9-18, 18-35, 35-75 and 75-120 mc. The 1A. Center Frequency Control Knob ITCENTER FREQ frequency dial (1). The center frequency control knob operates the 2. frequency range of the output

40、 signal. Frequency Range Knob FREQ RANGE-MC The dial-type frequency range knob indicates the 3. Step Attenuator Control Knob RF LEVEL-FULL SCALE The dial-type step attenuator control knob con- tains two scales, one red (0-10) and one black (10-30) which are keyed to the corresponding colors on the R

41、F level meter. The dial is marked in terms of open-circuit voltage across the output terminals of a 5 01 B output cable. 4. Output Level Vernier Control RF LEVEL- VERNIER The output level vernier control adjusts the output within the range of each step of the step attenuator (3). 5. The output meter

42、 indicates the RF output of the 240A as adjusted by the Step Attenuator control (3) and output level vernier. (4). Output Meter RF LEVEL METER 6. Sweep Rate Control Knob ,SWEEP RATE 20%- 40% - 60% I The Sweep Rate Control adjusts the repetition rate of the internal sweep continuously from 20 to 70 c

43、ps. 7. circuits in the CW position. CW-Sweep Selector Knob CW - SWEEP The CW-Sweep Selector knob disables the sweep 7A. Sweep Width Control Knob SWEEP WIDTH The Sweep Width control adjusts the frequency deviation when the CW-Sweep Selector (7) is in the sweep position. 8. Sweep Selector Knob SWEEP S

44、ELECTORTT Sweep Signal; external, internal or internally syn- chronized to the power line frequency. The Sweep Selector knob indicates the source of the 9. Pip Marker Amplitude Control Knob PIP MARKER AMPLITUDE The Pip Marker Amplitude controls the amplitude of the Pip Markers as observed on an osci

45、lloscope associated with sweep testing procedures. 10 and 11. Pip Marker Position Control Knobs PIP MARKER POSITION The Pip Mark Position controls adjust the position of the Pip Markers along the trace as observed on an oscilloscope. Each Pip Marker operates indepen- dently. 12. Crystal Marker Selec

46、tor Knob CRYSTAL The Crystal Marker Selector selects the intervals between the crystal marker birdies as observed on the oscilloscope trace; i. e. , 2.5 mc, .5 mc, or .l mc intervals. MARKER - MC 13. Crystal Marker Amplitude Control Knob CRYSTAL MARKER-AMPLITUDE The Crystal Marker Amplitude control

47、adjusts the amplitude of the crystal markers as observed on the oscilloscope trace. This control will allow adjust- ment of the markers to obtain good resolution when adjusting the Pip Markers. 14. Calibrate Phone Jack lCALIBRATE1l The calibrate phone jack is used to calibrate the 3 -1 Section 1 1 1 Paragraphs 3-4 to 3-9 center frequency dial by zero beating the CW RF out- put with the proper crystal marker harmonic. High impedance headphones or an oscilloscope is used to determine zero