HP-201C-Manual 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! Thanks to on-line curator: Kenneth Kuhn for supplying and scanning this vintage document. RadioFans.CN 收音机爱 好者资料库 . . . I - . . _ _ . .- AUDIO OSCILLATOR 201C . I-. RadioFans.CN 收音机爱 好

2、者资料库 CERTIFICATION 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 measure- ments are traceable to t

3、he 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 certain ma

4、jor compo- nents listed in the operating manual, for the specified period. We will repair or replace products which prove to be defective during the warranty period provided they are returned to Hewlett- Packard. No other warranty is expressed or implied. We are not liable for consequential damages.

5、 Service contracts or customer assistance agreements are available for Hewlett-Packard products that require maintenance and re- pair on-site. For any assistance, contact your nearest Hewlett-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

6、 OPERATING AND SERVICE MANUAL -hp- Part No. 201 C-906 MODEL 201C AUDIO OSCILLATOR Serials Refixed: 0961 A Appendix C, Manual Backdating Changes. adapts this manual to Serials Prefixed: 35146357 and below, 331-, 311-, 308-, 236-, 133-, 006- and serials 1358 to 557 and below. Copyright Hewlett-Packard

7、 Company 1959 P.O. Box 301, Loveland, Colorado, 80537 U.S Printed: Aug 1971 Model 201C Table of Contents TABLE OF CONTENTS Section Page I GENERAL INFORMATION . 1-1 1-1. Descrintion . 1-1 14. Instrument Identification . 1-1 1-7. Accessories Available . 1-1 Section Page I1 INSTALLATION. . .2-1 2-1. In

8、spection . .2-1 24. Power Requirements . .2-1 2-6. Power Cable . .2-1 2-9. 230-Volt Operation . .2-1 2-1 1. Repackaging for Shipment . .2-1 Section Page 111 OPERATING INSTRUCTIONS . .3-1 3-1. Controls and Terminals . .3-1 3-7. Operating Instructions . .3-1 3-8. Low Level Applications . .3-1 Section

9、IV THEORY OF OPERATION Page .4-1 4-1. General . 4-3. Oscillator Section 4-8. Amplifier Section . .4-1 . .4-1 . .4-1 Section V MAINTENANCE . 5-1. Introduction . 5-3. Test Equipment . . 5-5. Periodic Maintenance . 5-1 5-8. Performance Checks . .5-1 Page . .5-1 . .5-1 . .5-1 Section Page 5-10. Calibrat

10、ion Accuracy Check . 5-1 5-1 1. Frequency Response Check . .5-1 5-12, Output Check . .5-2 5-13. Distortion Check . .5-2 5-1 6. Adjustments . 5 -3 5-17. Power Supply . 5-3 5-19. Output Voltage 5-3 5-20. Distortion Adjns 5 -3 5-21. Frequency Calihra ion 5-3 5-22. Dial Retracking . . 5 4 5-24. Troubles

11、hooting . . 5 4 5-25. Trouble Localization . 5 4 5-28. Troubleshooting Chart . 5 4 5-30. Excessive Distortion . . , . 5-32. Repair . . 5-33. Cabinet 5-35. TubeRe . .5-8 5-37. Replacement of Lamp . .5-8 5-39. Replacing Range Switch . ,543 540. Adjustment of Factory Selected Components 5-8 Section Pag

12、e VI REPLACEABLE PARTS . .6-1 6-1. Introduction . .6-1 6-6. Non-Listed Parts 6-1 6-4. Ordering Information . 6-1 APPENDICES A. CODE LIST OF MANUFACTURERS B. SALES AND SERVICE OFFICES C. MANUAL BACKDATING CHANGES LIST OF TABLES Number Page Number Page 5-1. Required Test Equipment . . 5 0 5-5. Trouble

13、shooting Chart. . .5-5 5-2. Tube Replacement List . . 5 0 5-6. Factory Selected Components . .5-8 5-3. Calibration Accuracy Check . 5-1 6-1. Replaceable Parts . .6-2 1-1. Specifications . I 0 54. Frequency Response Check . .5-2 LIST OF ILLUSTRATIONS Number Paae Number Page 1.1. 4-1. 4-2. 4-3. 5-1. 5

14、-2. - Model 201C . 1-1 5-3. Block Diagram of Model 201C . . 4 0 54, Simplified Schematic Diagram of Oscillator Section . .4-1 5-5. Oscillator Network Characteristics . .4-1 5.6, Calibration Accuracy Check . .5-1 Frequency Response and Output Check . .5-2 5-7. - Distortion Check . .5-2 Left Side View

15、. . .5-6 Bottom and Right Side View . .5-7 Tube Location, Voltage and Resistance . .5-9/5-10 Schematic Diagram . .5-9/5-10 iii Section I Model 201C Table 1-1. Specifications Frequency Range: 20 Hz to 20 kHz in three ranges. Ranges x1 x10 XlOO 20 Hz to 200 Hz 200 Hz to 2 kHz 2 kHz to 20 kHz Calibrati

16、on Accuracy: *I%. Calibration controls provided for standardizing bands. Frequency Stability: *2% under normal temperature conditions and including initial warmup, aging of components etc. Dial: 6-inch diameter, calibrated over 3OOo of arc. Total scale length SO inches. Frequency Response: +1 dB ove

17、r entire frequency range (Reference 1 kHz.) Output: 3 watts maximum or 42.5 volts into 600-ohm load. One terminal at ground potential. SO volts maximum no-load voltage. Distortion: Less than 1/2%, 50 Hz to 20 kHz at 1 watt output. Less than I%, 20 Hz to 20 kHz at 3 watts output. Attenuator: 0 to 4Od

18、B in 10 dB steps-concentric amplitude control varies output continuously zero to maximum at any attenuator setting. Output Impedance: 600 ohms ?lo%, 20 dB, 30 dB and 40 dB settings Less than 600 ohms, 0 dB and 10 dB settings. Hum Voltage: Less than 0.03% of rated or attenuated output. (Amplitude con

19、trol at maximum.) Power: 115/230 volts f lo%, 48/440 Hz 85 W nominal. 120 W maximum. Accessories Available: HP llOOOA Cable Assembly, 4 feet of RC-SS/U SO-ohm coaxial cable terminated at each end with a dud banana plug. HP llOOlA Cable Assembly, 45 inches of RC-SS/U SO-ohm coaxial cable terminated a

20、t one end with a dual banana plug and with a UGSS/U Type BNC male connector at the other. Dimensions: Cabinet Mount: 7-1/2 inches wide, 11-1/2 inches high, 12-1/2inches deep.(l91 X292X318mm). Rack Mount: 19 inches wide, 6-31/32 inches high, 10-5/16 inches deep (482,6 X 177,O X 261,9 mm). Weight: Cab

21、inet Mount: Net, 16 Ibs. (7,2 kg);Shipping, 19 Ibs. ( 8 6 kg). Rack Mount: Net, 20 Ibs. (9 kg);Shipping, 30 Ibs. (13.5 kg) e Model 201C Section I SECTION I GENERAL INFORMATION 1-1. OESCRIFTION. 1-2. The Model 201C Audio Oscillator (Figure 1-l), has been designed for a general purpose, audio testing

22、and measurements such as amplifier testing, transmission line mcasurements, loud-speaker testing, frequency comparison, and other high fidelity tests. It contains a built-in stabilized amplifier stage delivering 3 watts of power into a 600uhm resistive load with distortion held to 112 per cent at fr

23、equencies above 50 Hz at 1 watt output and less than 1 per cent from 20 Hz to 20 kHz at 3 watts output. 1-3. The output level of thc Model 201C is adjustable. An attenuator is also provided to adjust the output level over a 0 to 40 dB range in 10 dB steps. The attenuator is a bridged-T type providin

24、g virtually a 600uhm impedance looking back into the instrument (at attenuation levels of 20 dB and above), and keeps the hum level low relative to small signal levels. With thc attenuator in the 0 dB position, output impcdance becomes less than 600 ohms, thus insuring good voltage regulation for va

25、rying load conditions providmg maximum output power. 9 1-4. INSTRUMENT IDENTIFICATION. 1-5. Hewlett-Packard uses a two-section serial number. The first section (prefix) identifies a series of instruments. The last section (suffm) identifies a particular instruiuent within the series. If a letter is

26、included with the serial number, it identifies the country in which the instrument was manu- factured. 1-6. If the serial prefix of your instrument dirfers from the one on the title page of this manual, a change sheet will he supplied to make this inanual cornpatable with newer instruments or the ba

27、ckdating information in Appendix C will adapt this inanual to earlier instruments. AU correspon- dence with Hewlett-Packard should include the complete serial number. 1-7. ACCESSORIES AVAILABLE. 1-8. 1 IOOOA Cable Assembly. This cable assembly consists of two dual banana plugs and a section of RC-SS

28、CjU 50uhm coaxial cable, 44 inches overall. Plugs are for binding posts spaced 314 inch between centers. 1-9. IlOOlA Cable Assembly. This cable assembly consists of a dual banana plug, a UG-88/U Type BNC male connector and a section of RC-SSC/U 50uhm coaxial cable, 45 inches overall. The dual banana

29、 plug is for binding posts spaced 314 inch between centers. Figure 1-1. Model 201C 1-1 Model 201C Section 1 1 SECTION II INSTALLATION 2-1. INSPECTION. 2-2. Unpack the instrument upon receipt and inspect it for signs of physical damage such as scratched panel surfaccs, b. Connect a new jumper between

30、 terminal 3 and 4. c. Change the line fuse to a 0.8 A slo-blo. broken knobs, etc. If there is any apparent damage, fde a claim with the carrier and refer to the warranty page in this 2-11. REPACKAGING FOR SHIPMENT, manual. 2-3. An electrical inspection should be performcd as soon as possible after r

31、eceipt. To aid in electrical inspection a list of performance checks are in Section V, Paragraph 5-8. These procedures make a good test as part of incoming qualitycontrol inspection. NOTE 2-12. The following is a general guide for repackaging for shipment. If you have any question, contact your loca

32、l -hp- Sales and office. (see Appendlx at the back ofthis manual for office location,) 2-4. POWER REQUIREMENTS. 2-8. The Model 201 C requires a power source of 11 8/230 volts + 10 76, 48 to 440 Hz, which can deliver up to 120 waits. 2-6. POWER CABLE. 2-1. For the protection of operating personnel, t

33、he National Electrical Manufacturers Association (NEMA) recommends that the instrument panel and cabinet be grounded. This instrument is equipped with a three-prong conductor power cablc which, when plugged into an appropriate receptacle, grounds the instrument. The offset pin on the power cable thr

34、ee-prong connector is the ground pin. 2-8. To preserve the protection feature when operating the instrument from a twocontact outlet, use a three-prong to two-prong adapter and connect the pigtail on the adapter to ground. 2-9. 230-VOLT OPERATION. 2-10. To operate the Model 201C from a 230-volt *IO%

35、 source, change the primary windings of T2 from a parallel to a series arrangement. Refer to the schematic diagram and proceed as follows: a. Remove the two bare wire jumpen from the terminals on T2. These jumpers connect terminal 2 to 3 and 4 to 5 on the primary winding. If the instrument is to be

36、shipped to HewlettPackard for service or repair, attach a tag to the instrument identifying the owner and indicating the service or repair to be accomplished; include the model number and full serial number of the instrument. In any correspondence, identify the instrument by model number, serial num

37、ber and serial number prefix. a. Place instrument in original container if available. If original container is not available, a suitable onc can be purchased from your nearest hp- Sales and Service Office. If original container is not used, b. Wrap instrument in heavy paper or plastic before placing

38、 in an inner container. c. Use plenty of packing material around all sides of instrument and protect panel faces with cardboard strips. d. Place instrument and inner container in a heavy carton or wooden box and seal with strong tape or metal bands. e. Mark shipping container with “DELICATE INSTRUME

39、NT,” “FRAGILE etc. 2-1 Model 201C SECTION 111 Section 111 OPERATING INSTRUCTIONS 3-1. CONTROLS AND TERMINALS. 3-2. ON. Toggle switch controls line voltage to instrument. b. Turn the power switch ON and allow approximately five minutes for the instrument to reach its normal operating temperature. 3-3

40、. RANGE. Three-position rotary switch selects various values of resistance in the bridge circuit of the RC oscillator. The position of this switch indicates the multiplying factor for the frequency dial calibration. 34. FREQUENCY dial. This control varies the capacitance in the bridge circuit of the

41、 RC oscillator to vary output frequency between range switch steps. The dial is calibrated from 20 to 200 and its indication multiplied by the factor indicated by the RANGE switch will give the actual output frequency of the oscillator. The small knob below the frequency dial is a vernier control fo

42、r thc dial. 3-5. ATTENUATION. This is a dual concentric control. The inner control is a potentiometer which adjusts the amplitude of the oscillator voltage admitted to the amplifier, and therefore, it adjusts the output voltage of the instrument from zero to a maximum value established by the attenu

43、ator. The outer control is a bridged-T type attenuator providing 0 to 40 dB of attenuation in 10 dB steps. 3-6. OUTPUT terminal. Two binding posts on the lower center of the front panel are the output terminals for the oscillator. Terminal marked G is connected to the chassis of the instrument. c. S

44、et the FREQUENCY dial and RANGE switch for desired output frequency. d. Set ATTENUATION outer control to 0 dB, then set inner control (amplitude) for desired output voltage. e. Set ATTENUATION outer control, if desired, to reduce output level in 10 dB steps. NOTE When the attenuator is in the OdB po

45、sition the amplifier output is delivered from less than 600 ohms at frequencies below 5000Hz, and it will produce its rated output (3 watts) across a load of 600 ohms. When the attenuator is positioned for 20 dB or more attenuation, the internal impedance is 600 ohms. 3-8. LOW LEVEL APPLICATIONS. 3-

46、9. To avoid excessive noise and hum at low output levels (40 dBm or less), it it good practice to attenuate the oscillator output -30 or 4 0 dB and use the amplitude control as an output vernier to obtain desired level. 3-7. OPERATING INSTRUCTIONS. a. Connect the power cable to required power source. 3-1 Section IV Model 201C OSCILLATOR AMPLIFIER 0-40db ATTENUATOR VI 8. v2 v3, v4, v5 ATTENUATOR 600n 0 - lOdb 600n 2 0 - 4 0 d b