Manual-1961 - HP Archive
Contents
1. Operation Plug the instrument into a nominal 115 volt 50 60 cycle power supply and turn on the power switch The instrument 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 control dial in the center of the panel and the AMPL control at the right of the panel Selection of a desired frequency is made by the frequency control dial in conjunetion with the RANGE switch The frequency control dial is cali brated directly in cycles per second for the lowest range the x1 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 100 respectively Thus to select a desired frequency set the frequency dial and RANGE switch so that the product of their read ings equals the desired frequency For example if it is desired to select 400 eps set the frequency dial to 40 and the RANGE switch to x10 The magnitude of the output voltage is deter mined by the setting of the AMPL control By means of this control voltages up to approximately 25 volts can be selected when the instrument is working into its rated load Rated load for both the Model 200A and 200B is 500 ohms resistive Higher loads can be used but resul2. 0 5 mf 600 vdcw CAPACITOR paper 2 sections each 4 mf 600 vdcw CAPACITOR paper 0 1 mf 600 vdew CAPACITOR air trimmer 100 mmf max 200A only CAPACITOR air trimmer 25 mmf max 200B only CAPACITOR mica 500 vdew value selected during factory adjustment CAPACITOR paper 600 vdcw value selected during factory adjustment sometimes omitted CAPACITOR electrolytic 3 sections each 10 mf 450 vdew CAPACITOR paper 4 mf 800 vdcw CAPACITOR electrolytic 40 mf 450 vdcw CAPACITOR mica 500 vdew value selected during factory adjustment sometimes omitted FUSE cartridge type size 3AG 1 amp PILOT LAMP 6 5v nin bay base FILTER CHOKE 6 henries at 125 made RANGE SWITCH ASSEMBLY LAMP 3 W 120v RESISTOR composition 47 000 ohms 1 watt RESISTOR composition 0 1 megohm 2 watts RESISTOR composition 0 1 megohm 1 watt RESISTOR composition 1 watt value selected during factory adjustment value does not exceed 820 ohms RESISTOR wirewound 3 000 ohms watt RESISTOR composition 0 56 megohm 1 watt RESISTOR wirewound 800 ohms 10 watts RESISTOR composition 27 000 ohms 2 watts RESISTOR wirewound 10 000 ohms 10 watts RESISTOR wirewound 10 000 ohms 20 watts POTENTIOMETER composition 25 000 ohms RESISTOR composition 10 000 ohms 1 watt RESISTOR composition 3 300 ohms 1 watt hp Stock No 13 100A A2 1500 146 5 17 4 16 1 13 100A 13 25A8 18 310 17 4 800
3. 18 40 211 1 21147 911 12A 200A A 19W 200B B 19W 211 3W 24 47K 25 100K 24 100K 396 3K 24 560K 26 500 25 27K 26 10K 27 10K 210 25K 24 10K 24 3300 Mir amp Type Surkes Tarzian A 1031 Oak Mig Co N90C 4 60 Aerovox 684 Girard Hopkins P 8 8 Aerovox 684 Sarkes Tarzian A 103L Sarkes Tarzian 0 25L Mallory FPT 389 Girard Hopkina P 8 4 Mallory FPS 116 Littelfuse 1040 General Elec 47 Hadley 8169A Hewlett Packard General Elec 86 3 watt Allen Bradley GB 4731 Allen Bradley HB 011 Allen Bradley 1011 que Bw Allen HBradley GHB 5641 Lectrohm 1365 Alleu Hradley 2731 Lectrohm hh Lectrohm 2R Centralab 1 010 1670 Allen Bradley GB 1031 Allen Bradley TABLE OF REPLACEABLE PARTS Description shp Stock No Mfr amp Type Circuil Ref composition 56 000 ohms 1 watt E 24 56K Allen Bradley GIHH 5631 R2 gt RZSISTOR R22 24 560K Allen Bradley Q1 5641 RESISTOR composition 0 56 megohm 1 watt R23 RESISTOR composition 56 000 ohms 1 watt 24 56K Allen Bradley 4 GB 5631 R21 RESISTOR wirewound 800 ohms 10 watts 26 800 Lectrohm 1X E n25 RESISTOR composition 10 000 ohms 1 watt 24 10K Allen Bradley GB 1031 R26 RESISTOR composition 10 000 ohms 1 watt 24 10K Allen Bradley GB 1
4. 031 R27 RESISTOR composition 1 4 watt value selected during fac tory adjustment sometimes omitted 32 SWITCH toggle SPST 310 11 Arrow H amp H 20994 TUBE RMA type 6J7 212 657 T2 TUBE RMA type 6F6 212 6F6 T3 TUBE RMA type 6F5 212 655 T4 TUBE RMA type 6V6 212 6V6 TUBE RMA type 574 212 524 TRI OUTPUT TRANSFORMER for Model 200A only A 9 Peerless 0021A TRI OUTPUT TRANSFORMER for Model 200B only B 9 Peerless 0021A TR2 POWER TRANSFORMER 910 200 Hadley 8158A KNOB molded black phenolic 11 diam 37 112 Kurz Kasch gt 8 380 64 L KNOB molded black phenolic 3 diam 37 3 Kurz Kasch S 312 64 TUBE SOCKET standard oct 1 38 8 Cineh 9950 LAMPHOLDER for 3 watt lamp M 1 Hewlett Packard MI 10
5. HP Archive This vintage Hewlett Packard document was preserved and distributed by Www hparchive com Please visit us on the web On line curator Hal Smith OPERATING AND SERVICE MANUAL MODELS 200A AND 2008 ALL SERIAL NUMBERS AUDIO OSCILLATORS Copyright HEWLETT PACKARD COMPANY 1961 PALO ALTO CALIFORNIA USA dp Printed FEB 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 numbers 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 omitted C11 was con nected directly across B The newer arrangement is recommended to reduce the peak voltage across electrolytic capacitors during turn on Types 5V4 5Z4 and 5Y3 rectifier tubes have been used for V5 The 5Y3 supplies about 50 vdc less B than the 5V4 and 574 The frequency dial should be calibrated with the recti fier tube that is to be used to prevent any small error due to a change in 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 use exactly the same value lf the value mus
6. change the small resistors in series with R1 and R4 If the out put frequeney is higher than the dial calibration increase the value of the small resistor if the out put frequeney is lower than the dial calibration de crease the value of the small resistor A change of about 100 000 ohms will change the calibration about 5 Do not change the value of more than 100 000 ohms without making a correspond ing change in R4 It is desirable to keep the value of R1 and R4 as equal as possible because the oscil lator tends to become unstable if the resistors are too unbalanced After each change it is necessary to replace the dust cover before checking the out put frequency The same procedure should be used if necessary to adjust the calibration of the x 10 and x100 ranges On the x10 ranze a change greater than 10 000 ohms should not b made in R2 without also chang ing R5 On the x100 range a change greater than 1000 ohms should not be made in R3 without also changing R6 It is important that the dust cover be tightly in place after each adjustment because the frequency calibration is affected by the dust cover The vacuum tube voltmeter should be used to check the output of the instrument after the cali bration has been adjusted Set the dial to 100 and the AMPL control to about 80 Connect the VTVM and measure the output of each range If the range switch has been properly adjusted the difference between
7. hing arrange ment to select different values of resistance for the network several ranges are given 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 amount 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 has sufficient thermal inertia so that it functions well even at low audio frequencies Following the oscillator section is the amplifier a conventional audio power amplifier with trans former coupled output Negative feedback is used in this amplifier to minimize distortion and to pro vide good frequency response The amplifier is de signed to deliver one watt of power into a 500 ohm resistive load over 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 sistance Although rated load for the instrument is 500 ohms loads of 600 ohms can be used with only a small loss in available power The power supply section includes a conventional full wave rectifier with a low pass pi filter for re moving the ac components from the rectified wave
8. ler has been tightened and the dust cover replaced it is desirable to check the cali bration of the instrument 91A opd YOO IPPON s 33 c9 i H TRI cu l T2 8 Top View of Deckplate Models 200A and 2008 S2 C7 R8 RI2 R9 RIO R26C3 RIG RIS RIB 9 RI4 05 Cl2 R20 CG c4 C9 R25 Bottom View of Deckplate Modaels 200A and 2008 T HOIVTII2SO OIdNV 8 OO2 130O0N dO WVYSVIC OILLVIN3HOS Rh 55 000 X 0310N 3 u3 10 Sein INN NI ALISWeWD 0311 wO 39 siss AVM Juge NMOHS 2n1gn 39vW3 Y AWOlOV4 BHI iv 031SnrQw 3n w 1v2u312323 4 09 08 asu av Wie 03454 IX 1V 1S Ou37 lv on 135 JONVASIS3Y 10nd4dN SHO 93M OO 40 34313W110 v SIS SVH ONV SANIOd Q31V2 QN 341 N3JMLJG NJNVL 1N3M38nSY3M Z A ddnS b3AMOd 09 05 170 61 1N3M38nSY3M 39Y110 20 20 SWOILIQNO 310N x 98 vue vu tue tu 1099 sue Su ny ax Get oes l dieu gt B oud p K pe a e m om 153 sa 19 18 29 we CR E o Po ay ou 1s AOR BOVLIOA 980 Circuit Ref 2 c6 CT C8 R1 6 amp S1 R7 RS R9 R10 aui qua R13 RH R15 R16 R17 R18 R19 R20 TABLE OF REPLACEABLE PARTS Description CAPACITOR alr trimmer 100 mmf max CAPACITOR variable 4 sections each 530 mmf max CAPACITOR paper
9. ration 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 frequency deter mining resistors in the oscillator positive feedback network These resistors each consist of a precision resistor in series with a smal one half watt resistor which is selected to give a very accurate frequency calibration Therefore adjusting the frequency cal ibration requires that the value of these small re sistors be changed as necessary to obtain proper calibration An oscilloscope an ac vacuum tube voltmeter ind a secondary frequency standard are needed to adjust the calibration of the Model 200 The sec ondary standard preferably should supply a fre quency of 1 ke Allow the Model 200 to heat for thirty minutes or more Connect the Model 200 to the vertical deflecting plate input of the oscillo scope and the secondary frequency standard to the horizontal deflecting plate input Next check the calibration of the Model 200 by means of Lissajous figures on the oscilloscope de termine whether the frequencies generated by the Model 200 are higher or lower than the dial calibra tion If the instrument is in need of recalibration the dial calibration will show a definite trend either higher or lower than the true output frequency for each range The various ranges of the Model 200 do not necessarily change in the same direction If the x1 range requires readjusting
10. roximately 75 ohms below 15 ke 60 db below rated output 115 volts 50 60 cycles 60 watts hp MODEL 200A and 2008 AUDIO OSCILLATORS OPERATING INSTRUCTIONS General hp Model 200A and 200B Audio Oscillators dif fer only in their frequency range and in the values of some of the circuit components Physically and in appearance the two instruments 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 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 The 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 combination 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 switc
11. t 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 few parts Two different versions are shown which represent almost all models of the 200A and 2008 n Panel View of Model 200A Panel View Model 2008 hp AUDIO OSCILLATORS MODEL 200A and 200B ELECTRICAL SPECIFICATIONS Model 200A 35 eps 35 000 cps Main dial calibration 35 350 Range X1 35 350 eps X10 350 3500 cps X100 3500 75 000 eps Within 2 watt into 500 ohms 500 ohms Within 15 ke 1 db from 35 eps to Less than 1 from 35 eps to 15 ke at rated output Within 2 under normal temperature conditions Approximately 75 ohms below 15 60 db below rated output 115 volts 50 60 cycles 60 watts FREQUENCY RANGE CALIBRATION ACCURACY FOWER OUTPUT RATED LOAD FREQUENCY RESPONSE DISTORTION FREQUENCY STABILITY INTERNAL IMPEDANCE HUM POWER SUPPLY Model 2008 20 cps 20 000 cps Main dial calibration 20 200 Range X1 20 200 eps X10 200 2000 cps X100 2000 20 000 eps Within 2 l watt into 500 ohnis 500 ohms Within 1 db from 20 cps to 15 kc Less than 1 from 35 eps to 15 ke at rated output Within 29 under normal temperature conditions App
12. t in a corresponding loss of power Lower loads are not recommended because they cause an increase in distortion and a reduction in the output voltage However no damage to the instrument will occur through the use of loads of less than 500 ohms MA NTENANCE Tube Replacement When replacing any of the tubes except the pow er rectifier it is desirable to measure the distortion in the output of the instrument because a poor tube can cause excessive distortion without otherwise affecting the operation Distortion should be less than 1 at frequencies between 35 cps and 15 ke Replacement of Lamp R7 If the 3 watt lamp R7 should require replace ment it is necessary for proper operation to check the ac voltage between the junction of C4 R19 and ground with the new lamp in the circuit As meas ured with a high impedance 1 megohm or more ac vacuum 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 rected by changing the value of R11 Increasing the value of this resistor will cause an increase in the subject voltage while decreasing the value will de crease the voltage A change of 50 ohms will change the voltage about 1 volt If it is necessary to use a resistor of more than 820 ohms reject 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 Calib
13. the output of the three ranges with the dial set at 100 should be within 1 db preferably less Trimmer Condensers Two trimmer condensers are provided for the main tuning condenser These trimmers are adjust ed at the factory and do not require further adjust ment for the life of the equipment If the trimmers inadvertently become misadjusted directions for resetting should be requested of hp Intermittent Output Jumpy or intermittent output accompanied by flashing of the 3 watt oscillator lamp is a reliable indication of a short in trimmer condenser C1 or in the first two sections of the main Luning condenser If these symptoms oceur search out and clear the short with a weak air jet or other means Do not bend the condenser plates as this affects 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 necessary to loosen the collar of the stop on the rear of the panel bearing When the condenser is completely closed set the main tuning dial so that the dot to the left of 20 on the main tuning dial is exactly under the hairline Tighten the coupler with the tuning dial and tuning condenser in these relative positions Then tighten the collar of the stop sothat the tuning condenser rotor cannot strike the frame or stator After the coup
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