HP-200A-200B-Manual-1961 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by www. h parc Please visit us on the web ! On-line curator: Hal Smith RadioFans.CN 收音机爱 好者资料库 O P E R A T I N G A N D SERVICE M A N U A L MODELS 2 0 0 A AND 200B ALL SERIAL NUMBERS AUDIO OSCILLATORS I Cepiroskl H I W L I

2、 I I . P A C K A R 0 COMPANY 1961 1501 PAOI MILL I O A O P A L 0 ALIO. C A L l f O I W I A , U S A 4 Printed: FEB RadioFans.CN 收音机爱 好者资料库 This manual is supplied for use with both the 200A and 200B Audio Oscillators having any serial number below about 41,000. In oscillators with very low serial num

3、bers the values of a few of the parts differ from the values given in the parts list and schematic diagram, for example: In oscillators with very low serial numbers, C16, R29 and R30 were omittrd; C11 was con- nected directly across B+. The newer arrangement is recommended to reduce the peak voltage

4、 across electrolytic capacitors during turn-on. Types 5V4, 524 and 5Y3 rectifier tubes have been used for VS. The 5Y3 supplies about 50 vdc less B+ than the 5V4 and 524. The frequency dial should he calibrated with the recti- fier tube that is to beused to prevent any small error due to a change in

5、B+ volts. The values of R14, R17, R19 and R24 have been adjusted over small ranges to accommodate component part characteristics at various times. R17 and R19 were often 15 k, and R14 and R24 were sometimes up to 250 ohms below the value shown on the schematic diagram. When replacing parts try to us

6、e exactly the same value. If the value must be changed check the distortion in the output waveform at maximum output voltage into rated load, over as wide a frequency range as possible. The appearance of the bottom of the chassis may differ from the views in this manual due to minor relocation of a

7、few parts. Two different versions are shown which represent almost all models of the 200A and 2mB. RadioFans.CN 收音机爱 好者资料库 c i -hp- AWDIO QSC!GLATQRS MODEL 20QA and ZQOB ELECTRICAL SPECIFICAT10NS FREQUENCY RANGE CALIBRATION ACCURACY POWER OUTPUT RATED CQAQ FREQUENCY RESPONSE DISTORTIQH FREQUENCY STA

8、BILITY INTERNAL IMPEOANCE HUM POWER SUPPLY 2 -hp- MODEL 200A and 2 0 0 B AUDIO OSCILLATORS OPERATING INSTRUCTIONS General -hp- Model 200A atid 200R Audio 0scill;itors dif- fer only in their frequency range and in the v;ilucs of some of the circuit components. Physically and in appearance the two ins

9、truments are the same. This instruction manual therefore covers the oper- ation and maintenance of both instruments. In this manual the term “Model 200” is used collectively, referring to both the Model 200A and 200B. When this instrument is first received from the factory, it is desirable to make a

10、 thorough inspec- tion for possible damage in transit. If any such damage is found, the procedure at the back of this manual should be followed. Circuit Description The circuit of the Models 200A and 200B, shown on page 8, can be divided into the oscillator, am- plifier, and power supply sections. T

11、he oscillator section includes T1 and T2 and is known as a resistance-tuned oscillator. Basically, this oscillator is a two-stage resistance-coupled am- plifier which is caused to oscillate by the use of a positive-feedback network. This network is a fre- quency -selective resistance-capacity combin

12、ation which controls the frequency of oscillation. By us- ing a variable tuning condenser for the capacity of the network it is possible to tune the oscillator over a wide range; and by using a switching arrange- ment to select different values of resistance for the network several ranges are given

13、to the oscillator. Negative feedback is also used in the oscillator section in order to minimize distortion and to ob- tain highest stability. The amount of negative feedback is determined by a resistance network, one element of which is non-linear (the 3-watt lamp R7). This element controls the amo

14、unt of feedback in accordance with the amplitude of oscillation and consequently maintains the proper operating point for the system. It is noteworthy that this element 3 hits suflic.ic.rit th(brm1itl inorti;i so thiit it fuwticms w(4l (VPII :it IIIW :iuclio frtviiii*ncicbs. IWlowiiig the oscillator

15、 section is ttw amplifivr, ; I conventioiril audio power amplifier with trans- former-coupled output. Negative fcedback is used in this amplifier to minimize distortion and to pro- vide good frequency response. The amplitier is de- signed to deliver one watt of power into a 500-ohm resistive load ov

16、er the major portion of the fre- quency range. The internal impedance of the output system is quite low, approximately 75 ohms, and for this rea- son the output voltage is not critical with load re- sistancth. AlttiouKh rated load for the instrument is 500 ohms, loacts ot 600 ohms can be used with o

17、nly iI small IOSS in iivitjl;iblc power. Thtb powr siipply scion includes a conventional full-wiivti rchctifitbr with a low-pass pi tilter for re- moving the iLc corn1)onents from the rectified wave. Operation Plug the instrument into a nominal 115-volt, 50/60 cycle powcr supply and turn on the powe

18、r switch. The instrumtint will begin to operate in a minute or two, but for maximum accuracy a warm- up period of 20 to 30 minutes is desirable. Only three controls are necessary for the opera- tion of the Model 200A or 200B. These are the RANGE switch at the left of the front panel, the frequency c

19、ontrol dial in the center of the panel, and the AMIL control at the right of the panel. Selection of ;I desired frrqwncy is made by the frequency control dial in conjunction with the RANGE switch. The frequtwcy control dial is cali- brated directly in cyclc.s per second for the lowest range, the xl

20、range of the RANGE switch. The other two positions of the RANGE switch multiply the frequency dial calibration by the indicated fac- tors of “10” and “lOO”, respectively. Thus, to select a desired frequency, set the frequency dial and RANGE switch so that the product of their read- inpi etlkiiil:i t

21、htt cltsired frtqurricy. 1401- example, if it is desired to selrct 400 cps, set the frcvuvncy dial to “40” and the IiANGE switch to 1 0 ” . The niagnitutle of the output voltage is deter- mined by the setting of the AMPL control. By means of this control voltages up to app:*oximately 25 volts can be

22、 selected whcln the instrument is working into its rated load. ltalc+cl loat for I d h t t i t 1 ILloclt4 20OA and 200B is 500 otliiis rosist ivc. l l r r t i c loads rill1 tw uscd but rcbsult i n ib coircsoiitlirrg loss of power. Lower loads ;ire riot recommcrrcled because they cause an increwsc in

23、 distortioii and a reduction in the output voltage. However, no dtimagc. to the instrument will occur through thtb use of loads of less than 500 ( ) hms. M A N T E N A N C E Replacement of lamp R7 If the 3-watt lamp (R7) should require rtqdace- ment, it is necessary for proper operation to check the

24、 ac voltage between the junction of C4-Kl9 and ground with the new lamp in the circuit. As meas- urvtl with a high-impedance (1 megohm or more) ac viiciium tube voltmeter, this voltage should be within the range of approximately 20-22 volts. If the voltage is not within this range, it may be cor- rr

25、cttd by chrtnging thc value of R11. Increasing the value of this resistor will cause an increasth in the subject voltage, while decreasing the value will (le- crease the voltage. A change of 50 ohms will ctianxo the voltage ahout 1 volt. If it is necessary to usv it resistor of more than 820 ohms, r

26、ojtvt the lamp in favor of another. The design of the circuit is such that not more than an 820-ohm composition resis- tor should be used. Frequency Calibration If a change occurs in the frequency calibration after a long period of use, the cause of this change probably lies in the aging of the freq

27、uency-deter- mining resistors in the oscillator positive feedback network. These resistors each consist of tl precision resistor in series with a small one-half watt resistor which is selected to give a very accurate frequency calibration. Therefore, adjusting the frequency cal- ibration requires th

28、at the value of these small re- sistors be changed as necessary to obtain proper calibration. horizontal dcffrcting plate input. Next chthck the calibration of the Model 200 by mwns of 1,issajous figures on the oscilloscope; de- twrnint M ticithvr thc. frrquencies gtmtmted by the Rlodel 200 iirt hig

29、her or lower than the dial calibra- tion. If the instrument i s in nerd of recalibration, the! dial calibration will show a definitcl trend either higher or lower than the true output frequency for each range. The various ranges of the Model 200 do not nrcrssarily change in the same “direction”. If

30、thtb xt rangt rtyuirc.5 rutijristing, change the sinall rwistors in serics with lil and 124. If the out- licit frcqiicliicy is hinhvr t tian thv (1i;iI ciilit)ration, iiicrcvisc t h i s ViiIti(1 of ttitb smilll rthsistor; if thv out- iriit frctlucwy is Iowcbr th;iii the dial c.;ilil)rat.ion, de- Cr(

31、iis(b t l i c h valiitb of thin siiitlll rcbsistor. A change of about 100,000 o h m s will chang:c thc calibration about 1 2 ; . I)o I i o t (hinge the value of K1 more then 100,000 ohms without making a correspond- ing change in R4. It is destrable to keep the value of H1 and It4 as equal as possib

32、le, btlcause the oscil- lator teiids to become unstable if the resistors are too unbalmced. After each change it is necessary to rep1ac.e the dust cover before checking the out- put frequency. The same proccdrrre should b used if necessary to adjust the calibration of the x10 and x100 ranges. Ori th

33、e x10 rmxc a chanp grrater than 10,000 ohms should ottt l ) t marl(8 in 1 2 2 without ill?io rhang- irig R5. On the x IO(J r : i i i t : t * a ch;ingv grt.;lttar than houltl lot he, rriatl(* in IC! without also changing it L weak air jet or other means. I)o not bend the condenser plates as this affe

34、cts frequency calibration. Dial Coupler An insulated coupler connects the main tuning dial to the shaft of the main tuning condenser. If the coupler becomes loosened, rotate the condenser completely clockwise. To do this it will be nccessary to loosen the collar of the stop on the rear of the panel

35、bearing. When the condenser is completely closed, set the main tuning dial so that the clot to the left of “20” on the main tuning dial is exactly under the hairline. Tighten the wupler with tht- tuning dial and tuning condcvisw in these rthtive positions. Then tighten the collar of the stop so that

36、 the tuning condenser rotor cannot strike the frame or stator. After the coupler has been tightened and the dust cover replaced, it is desirable to check the cali- bration of the instrument. 5 b PI c 0 0 N TS L1 G2 C 6 T4 RI - Re - R 3 - + A - R 7 CI T2 R18 T3 Top View o f Deckplate- Models 200A and

37、 2008 Boltom View of Deckptot+Modalr 200A and. 2008 7 R27 G8 R 21 RV R 24 ! i TABLE OF REPLACEABLE PARTS Clrmll Ref C 1 (- 2 C3 C1 c 5 C6 C6 (7 (:n c9 c10 (1 1 c12 4 srctioiis t*;wlt 530 ninit n i a j 1 CAPACITOR: payer; 0.5 mf. 600 vtlcw CAPACITOR: papei ; 2 sectlons each 4 mf. 600 vc1c.w CAPACITOR

38、: paper; 0.1 mf. 600 vtlcw CAPACITOR: air trinmer; 100 ninif niax (200A only) CAPACITOR: ail trimmer, 25 mmt max (200B only) CAPACITOR: niicii; 500 vdcw; value selected chiring factory udjiistment CAPACITOR: paper: 600 vtlcw; value selected dui ing factory adjustnient; sometimes omitted CAPACITOR: e

39、lectrolytic; 3 sectlons. each I0 n11. 150 vtlcw CAPACITOR: paper, 4 mf. 800 vdcw CAPACITOR: electrolytlc; 40 mf. 450 vdcw CAPACITOR: nilcit. 500 vdrw. value srlectetl t l i i i Ing factory ad jitst in en t , soiiietlnies onii t tecl FUSE: cat tildge type, size 3AG. 1 ani) PILOT LAMP: 6-Mv; niin bay

40、base FILTER CHOKE: 6 heniiea at 125 niatlc RANGE SWITCH ASSEMBLY I, LAMP: 3-W. 120v RESISTOR: composition; 47,000 ohms; 1 watt RESISTOR: composition; 0.1 iep;olim; 2 watts RESISTOR: compositioii; 0.1 niegohin; 1 watt RESISTOR: coinposition; 1 watt; viiliie st.lrctrt1 tlitriiig ftic.loIy atljustiiien

41、t; value does not esc.t?etl H20 ohms RESISTOR: wirewoiincl; 3,000 ohnis; 1 wiitt RESISTOR: composition; 0.56 nieKohni; 1 watt RESISTOR: wirewoiml; 800 ohnis; I O watts RESISTOR: coniposilion; 27.000 ohnis; 2 watts RESISTOR: wirewountl: 10,000 ohms; 10 watts RESISTOR: wirewoiind; 10.000 ohms; 20 watt

42、s POTE NTlO M ETER : composition ; 25,000 olirns RESISTOR: composition: 10,000 ohitis; 1 watt RESISTOR: coinposition; 3.300 ohms; 1 watt h i Stork No 13 100A 12. 1500 16 5 17-44 16-1 13-lOOA 13-25AS in 310 17 4-800 18-40 211-1 211-47 911-1ZA 2OOA: A-19W 200D D-19W 211-3w 24-47K 25-IOOK 21-lOOK 26 :t

43、i 2.1 5WK 26 800 25-21K 26-10K 27-10K Z10-25K 24 10K 24 :no0 Mlr 0-473 I Ailrii Ilratlley : : 1111 1011 Allrii IIiaillry 011 10 I I 9 TABLE OF REPLACEABLE PARTS . - ._ RTSISTOR: composition; 5ti.000 ohms. 1 u i i t t RESISTOR: coiiiposition; 0.56 niepohiii; 1 wiitt Cirruil Ref. r 24-56K 21-5GUK Drbc

44、rivtiott -1 -lip- Stock No. B-9 1 91 0-200 37-1 12 Irerless. 0021A Hadley : 8158A Kurz-Kasch: S-380-64-L RESISTOR: composition; 56.000 ohms; 1 watt 24-561; RESISTOR: wirewound; 800 ohms; 10 irntts RESISTOR: cornposition; 10.000 ohnis; 1 watt RESISTOR: coiiiposition; 10,000 ohms; 1 watt RESISTOR: com

45、position. i i t t ; valiie selcvtrtl tluriiig fat- tory atljustnient; sonietimes oititttetl SWITCH: toggle; SPST TUBE: 1tMA type 657 TUBE: ILMA type tiF6 TUBE: IfMA type 6F5 TUBE: RIMA type tiV6 TUBE: ItMA type 5 Z . 1 OUTPUT TRANSFORMER (for Model 200A only) OUTPUT TRANSFORMER (for Model 200B only)

46、 POWER TRANSFORM ER KNOB: moldecl black phenolic; 1% diam. KNOB: moltletl black phenolic; 3 diiim. TUBE SOCKET: standard oct: 1 LAMPHOLDER: for 3-watt lamp 26-800 24-10K 24-1OK . e Mfr I l y p t Al1a-11 Ilrittlley: CIi 5631 Allen-Draclley : A I Ien-Drad i ey : Lectrohm: ISLE AI Iri1-ni.a tl Icky : GB-IO31 Alleii Iradley: GI-1031 CII-5641 Gl3-5631 f-% i I 3 10