HP-297A-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 O P E R A T I N G AND S E R V I C E M A N U A L MODEL 2 9 7 A SERIALS PREFIXED: 139 - SWEEP DRIVE 1961 Copyrieht HEWLETT-PACKARD COMCANV 1501 PAGE MILL ROAD, P A L 0 ALTO, CALIFORNIA. U.S.A. 01163-2 RadioFans.CN 收音机爱 好者资料库 Model 297A Table of Contents Lists of Illustrations and Tables TABLE OF CONTENTS Section I GENERAL INFORMATION . 1 . 1 . General Description . 1.3 . Uses . 1.5 . Instrument Identification . 1.7 . Power Cable . 1 1 INSTALLATION . 2.1 . General Information . 2.3 . Mechanical Inspection . 2.5 . Mounting . 2.6 . Analyzer . 2.8 . Mounting on the Bench Stand . 2- 10 . Power Requirements . 2.12 . In-Cabinet Performance Check . 2- 14 . Reshipment . 111 OPERATION . 3- 1 . General Information . 3.3 . Operating Controls . 3.5 . Sweep Sector Operation . 3.6 . 3.8 . Mounting on the 302A Wave Sweep Sector Operation with Model 302A . Sweep Sector Operation with De- vices other than the Model 302A . 3.10 . Sweep Voltage Output . Page Section Page 1-1 IV PRINCIPLES OF OPERATION . . . . . . . 4-1 1-1 4.1 . Introduction . . . . . . . . . . . . . 4-1 1-1 4.3 . Power Supply . 4-1 1-1 4 . 5 . Motor . 4-1 1-1 2-1 v 2- 1 2- 1 2- 1 2-1 2- 1 2-2 2-2 2-2 3- 1 3- 1 3- 1 3- 1 MAINTENANCE . . . . . . . . . . . . . . 5-1 5 . 1 . Introduction . 5-1 5 . 3 . Cabinet Removal . 5-1 5.5 . Lubrication . 5-1 5.7 . Test Equipment . 5-1 5.9 . Troubleshooting . 5-1 5.10 . Power Supply . 5-1 5.12 . Gear Trains . . . . . . . . . . . . 5-1 5.14 . Motor and Gear Replacement . . . . 5.15 . Motor Replacement . 5-2 5- 17 . Gear Replacement 5-2 5.18 . In-Cabinet Performance Check . 5.20 . RPM Check . 5-2 5.22 . Torque Check . 5-2 5.24 . Power Supply Check . . . . . . . . 5-2 5-2 . . . . . . . . . 5-2 3- 1 VI REPLACEABLEPARTS . . . . . . . . . . 6-1 . 3- 1 6.1 . Introduction . . . . . . . . . . . . . 6-1 3- 1 6 . 4 . Ordering Information . 6-1 LIST OF ILLUSTRATIONS Number Title 1.1 . Model 297A Sweep Drive . 2.1 . Model 297A Mounted on 302A . 2.2 . Assembled Bench Stand . 2.3 . Model 297A Mounted on Bench Stand . 3- 1 . Operating Controls 5.1 Schematic Diagram 6.1 . Exploded View. Model 297A . . . . LIST OF TABLES Page 1-0 2-0 2- 1 2-2 3-2 5-3 6-4 Number Title Page 1 . 1 . Specifications . 1-1 5.1 . Test Equipment . 5-1 6.1 . Replaceable Parts. Electrical . 6-1 6.2 . Replaceable Parts. Mechanical . 6-3 01163-1 RadioFans.CN 收音机爱 好者资料库 Section I Figure 1-1 1-0 Figure 1-1. Model 297A Sweep Drive Model 297A 01163-1 I - Model 297A SECTION I GENERAL I N F O R M A T I O N Section I Paragraphs 1-1 to 1-9 1-1. GENERAL DESCRIPTION. 1-2. The Model 297A, formerly called the Model AC-97C, is a two-speed motor driven unit designed to sweep oscillators and other tunable devices through their ranges automatically. The Model 297A reverses automatically when it reaches a preset clockwise or counterclockwise limit. The limits can be set for a very narrow or broad range. The Model 297A has two speeds: HIGH SPEED gives an output shaft rota- tion of 10 rpm, LOW SPEED gives an output shaft speed of 1.0 rpm. An output voltage, useful for driving x-y recorders, oscilloscopes, or other de- vices, is supplied to output terminals. The output voltage is proportional to output shaft rotation. Figure 1-1 illustrates the Model 297A, with brackets for mounting on the Model 302A. 1-3. USES. 1-4. The Model 297A was designed primarily for use with the Model 302A Wave Analyzer andis supplied with necessary hardware to mount on the Model 302A. The Model 297A can be used with other devices that do not require excessive torque. For applications other than with the Model 302A, the Model 297Ais available with a bench stand. When the benchstand is used; the Model 297A can be adjusted between 4 and 12 inches in height. The Model 297A is supplied with two flexible couplers so that it may be used with either ($9 Model 302A or 31QA. 1-5. INSTRUMENT IDENTIFICATION. 1-6. Hewlett-Packard uses a two-section eight-digit 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 and the Model 297A described in this manual. 1-7. POWER CABLE. 1-8. For the protection of operating personnel, the National Electrical Manufacturers Association (NEMA) recommends that the instrument panel and cabinet be grounded. This instrument is 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 is the ground pin. 1-9. To preserve the protection feature when opera- ting 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. Table 1-1. Specifications SWEEP RANGE: 64 revolutions (see Sweep Voltage Output specifications). SWEEP LIMITS: Any interval from 64 revolutions to 10 degrees. SWEEP SPEED WITH 302A: 170 cps persecond and 17 cps per second. SHAFT SPEED: 10 rpm, 1 rpm, and neutra1;quick change speed transfer without stopping. Neutral permits manual operation. STARTING AND RUNNING TORQUE: 9 oz-in at 10 rpm. Friction clutch limits torque at 1 rpm to approximately 12 oz-in. MOTOR: Reversible synchronous capacitor type reluctance motor; may be stalled indefinitely. OUTPUT SHAFT: 1/4 inch diameter with 7/16 coupler inch for ( $ 9 Model 302A. POWER: 115 volts lo%, 50 to 60 cps, 12 watts, running or stalled. SWEEP OUTPUT: 15 volts maximum. Change of MOUNT: Mounts on front panel of ($9 Model 302A. output proportional to change in shaft position and zero output may be set for any shaft posi- DIMENSIONS: 3-1/2 inches high, 7 inches wide, tion. Full output may be obtained with either 5-1/4 inches deep, shaft extends 13/16 inch 2.1 revolutions or with 50 revolutions of the behind case. output shaft. When shaft speed control is in High Speed, sweep output control cannot be set ACCESSORIES AVAILABLE: Bench stand(ll505A) to Short Sweep. Adjust shaft height from 4 to 12 inches. 01163-2 1-1 Section I1 Figure 2-1 2-0 Model 297A T Figure 2-1. Model 297A Mounted on 302A . - 01163-1 Model 297A Section I1 Paragraphs 2-1 to 2-9 SECTION II INSTALLATION 2-1. GENERAL INFORMATION. 2-2. The Model297Ais shipped from the factory with two flexible couplers. One is suitable for connecting the 297A to the 302A; it has a 1/4-inch adapter on one end anda7/16-inch adapter on the other end. The other is suitable for connecting the 297A to the 310A; it has a 1/4-inch adapter on both ends. 2-3. MECHANICAL INSPECTION. 2-4. Unpack the instrument upon receipt and inspect it for signs of physical damage such as scratched panel surfaces, broken knobs, etc. If there is any apparent damage, file a claim with the carrier and refer to the warranty page in this manual. 2-5. MOUNTING. 2-6. MOUNTING ON THE 302A WAVE ANALYZER. . 2-7. To mount the Model 297A on the Model 302A, proceed as follows: a. Remove the fine vernier knob on theModel302A. b. Set the Model 302A on its back so controls are c. Counting from right to left on the 302A, remove second and third screws nearest the top of the 302A. These screws will be the twonearest the FREQUENCY dial (see figure 2-1). d. Carefully slide the 297A output shaft coupler over the 302A vernier drive shaft. Tighten the output shaft coupler screws. e. Align holes in the two mounting lugs with holes made by removal of two screws on the Model 302A. f. Carefully insert screws in holes of mounting lugs and finger tighten. Be careful. There may be three shims under each screw-hole of the Model 302A. If jarred, they may fall into themechanism. Be sure the output shaft rotates freely before tightening the screws. , facing upwards. 2-8. MOUNTING ON THE BENCH STAND. 2-9. To mount the Model 297A on the 11505A bench stand, proceed as follows: a. Remove the four screws at the rear that secure the mounting bars to the back of the Model 297A. b. Attach the two bench stand brackets to the back of the Model 297A, using the four extra screws sup- plied with the bench stand. c. Insert the two rods supplied with the benchstand into the holes in the stand. Tighten the screws at the rear of the stand to secure the rods (see figure 2-2). d. Slide the Model 297A mounting brackets over and down on the rods (see figure 2-3). Adjust the Model 297A to the proper height (make sure the output shaft - 01163-2 rotates freely when coupled to the instrument to be driven), then tighten the screws on the mounting bars to hold the Model 297A in place. Note The 297A drive shaft has a bushing -band friction clutch: care is required in mounting the flexible coupler on the 297A drive shaft to ensure that the friction clutchperformsprop- erly. The appropriate coupler should be mounted as follows: a. Place coupler on shaft and align one of setscrews with openingin steel band on shaft and tighten aligned setscrew moderately. b. Tighten other setscrews. CAUTION: When mounting flexible clutch on Model 310A shaft, setscrews must be flat- rather than cup-ended. c. Torque required for slippage in friction clutch should be approximately 20 inch- ounces. Readjustment of aligned setscrew may be necessary f, 1 ; I i I i ! Figure 2-2. Assembled 11505A Bench Stand 2-1 Model 297A Section I1 Paragraphs 2-10 to 2-15 2-10. POWER REQUIREMENTS. 2- 11. The Model 297A operates from a 50- to 60-cycle, 115-volt power source. If 230-volt operation is de- sired, a suitable 230- to 115-volt step-down trans- former, such as the 9100-0007 can be used. 2-12. IN-CABINET PERFORMANCE CHECK. 2-13. If an in-cabinet performance check is desired, refer to section V of this manual. 2-14. RESHIPMENT. 2- 15. To protect electronic equipment during storage or shipment, always use the best packaging methods available. Contract packaging companies in many cities can provide dependable packing on short notice. The following packaging methods are recommended: a. Original. Place instrument in original container. Replace all packing pads and fillers in theexact posi- tion they originally occupied. b. Rubberized Hair. Cover painted surfaces of instrument with protective wrapping paper. Pack instrument securely in strong corrugated container (350 lb/square inch bursting test) with 2-inch rubber- ized hair pads placed along all surfaces of the instru- ment. Insert filler between pads and container to insure a snug fit on all surfaces of the instrument. c. Excelsior. Cover painted surfaces with protec- tive wrapping paper. Pack instrument in a strong corrugated container (350 lb/square inch bursting test) with a layer of excelsior about 6 inches thick, packed firmly against all surfaces of the instrument. i 7 Figure 2-3. Model 297AMounted on 11505A Bench Stand 2-2 - 01 163- 2 Model 297A SECTION 111 OPERATION Section I11 Paragraphs 3- 1 to 3- 13 Note 3-1. GENERAL INFORMATION. 3-2. The Model 297A supplies power for driving such instruments as signal generators, potentiometers, and other devices to give a constant change or frequency, resistance, or some other parameter. The rate and amount of change can be controlled toclose tolerances with the panel controls. An output voltage proportional to the amount of rotation is supplied to output ter- minals. The output voltage can be connected to any kind of indicating device having a relatively high input impedance. The remainder of section 1 1 1 fully de- scribes the operation of the Model 297A. 3-3. OPERATING CONTROLS. 3-4. For a description of the operating controls, re- fer to figure 3-1. 3-5. SWEEP SECTOR OPERATION. 3-6. SWEEP SECTOR OPERATION WITH MODEL 302A. 3-7. To set the Model 297A for sweep sector opera- tion with a Model 302A, proceed as follows: a. Set all switches of the Model 297A to the OFF position. b. Set the speed-change lever at the left side of the Model 297A to NEUTRAL and pull the CW LIMIT and CCW LIMIT knobs to the disengaged position. Note As the Model 302A (CPS) FINE control is rotated in a clockwise direction, dial fre- quency decreases. c. Using the Manual Sweep knob on the 297A, ro- tate the frequency dial in a clockwise direction until the desired lower frequency limit is reached. Then rotate the CW LIMIT knob in a clockwise position un- til it reaches the mechanical stop. Then push the CW LIMIT knob “in” to the engaged position. d. Using the Manual Sweep knob, rotate the output shaft counterclockwise until the desired upper fre- quency limit is reached. e. Rotate the CCW LIMIT knob in a counterclock- wise direction until it reaches the mechanical stop. f. Push the CCW LIMIT knob “in” to the engaged position. g. Set the speed-change lever at the left side to LOW SPEED, and the POWER switch to ON. When using the Model 297A with the Model 302A, the speed changer must be set to LOW SPEED. The Model 302A has verynarrow pass-band, and if the dial frequency is rapidly changed, the output circuits will not respond to changes. h. Set both the CW and CCW switches to the SWEEP position. The Model 297A will continuously rotate the frequency dial from the lower to upper frequency position. i. If only a clockwise sweep is desired, set the CCW switch to the OFF position. If a counterclock- wise sweep is desired, set the CW SWEEP switch to the OFF position, CCW switch to ON position. j. Setting the speed-change lever to LOW SPEED will cause the output shaft to rotate at 1.0 rpm. HIGH SPEED causes the output shaft to rotate at 10 rpm. 3-8. SWEEP SECTOR OPERATION WITH DEVICES OTHER THAN THE MODEL 302A. 3-9. Sweep operation of other devices is similar to operation with the 302A, but the bench stand must be used. When the bench stand is used, be sure the out- put shaft rotates freely when the Model 297A is con- nected to the device. The sector to be swept is set the same as when the Model 297A is used with the 302A. 3-10. SWEEP VOLTAGE OUTPUT. 3-11. The sweep voltage output can be used to drive recorders, oscilloscopes, and other devices used to define coordinates of a point. The OUTPUT LEVEL control sets the voltage to any level between 0 and 15 volts. This adjustment allows the operator to estab- lish a reference level or zero a recorder. The adjust- ment is made by holding firm the Manual Sweep (center knob) and rotating the OUTPUT L