HP-211B-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 ! On-line curator: Bob Krassa AC0JL RadioFans.CN 收音机爱 好者资料库 N . :z: OPERATI N GA ND-5 E R VICEMANU A L SQUAREWAVE GENERATOR 2118 -b.+ AMPLITUDE - . ., J. .01 I V(RNIER HUOOE.OUTPUTOUTPU

2、T OUTPUT-. TRIOGJtAMPliTUDE POLARITT 10 SYMETRY FREQ.UEHCYfHz)-MUlTlPlIER HEWLETTPACKARD :z: . RadioFans.CN 收音机爱 好者资料库 CERTIFICATION TheHewlett-PackardCompanycertifies thatthisinstrumentwas thoroughly testedandinspectedandfoundtomeet its published specificationswhenitwasshippedfromthefactory.TheHewl

3、ett- PackardCompanyfurther certifies that its calibration measure- mentsaretraceabletotheU.S.National Bureau of Standardsto theextentallowedbytheBureaus calibration facility, WARRANTYANDASSISTANCE ThisHewlett-Packardproductiswarrantedagainstdefects inmaterialsandworkmanship.Thiswarrantyappliesfor on

4、eyearfromthedateofdelivery,or,inthecaseofcertain majorcomponentslistedin theoperatingmanual,forthe specifiedperiod.Wewillrepairorreplaceproductswhich proveto be defectiveduringthewarrantyperiodprovided theyarereturnedtoHewlett-Packard.Nootherwarranty isexpressedorimplied. Wearenotliableforconsequent

5、ial damages. Servicecontractsorcustomerassistanceagreementsare availableforHewlett-Packardproductsthatrequiremain- tenanceandrepairon-site. Foranyassistance,contactyournearestHewlett-Packard SalesandServiceOffice.Addressesareprovidedatthe back ofthismanual. I RadioFans.CN 收音机爱 好者资料库 I I OPERATINGAND

6、SERVICEMANUAL MODEL 2118 SQUAREWAVEGENERATOR SERIALS PREFIXED: 0817A- RefertoSectionVIIforinstrumentswithother Serial Prefixes. (/()l(6-L/?/W-AJ)Yo11 0-?6/U IJS-A)66,2Sde-IrY1-J.LJqt( Cl:611r/-(q6G).; -(1lf(-3 .- IJ(0(; s-J0I6( HEWLETT-PACKARDCOMPANY/COLORADOSPRINGSDIVISION 1900GARDENOFTHEGODSROAD,C

7、OLORADOSPRINGS,COLORADO,U.S.A. Manual Part Number 00211-90901. Microfiche Part Number 00211-90801. PRIIlTED: MAR 1971 TableofContents TABLE OF CONTENTS Model211B SectionPageSection Page INSTALLATION2-1 2-1.Initial Inspection2-1 2-4.Preparation ForUse2-1 2-5.Three-Conductor Power Cord2-1 2-7.Power Re

8、quirements . . . .2-1 2-11.Claims. . . . . . . . . . . . .2-1 2-13. Repackaging ForShipment.2-1 OPERATION3-1 3-1.Introduction. . . . . . .3-1 3-3.ControlsandConnectors.3-1 3-8.Operating Considerations.3-1 3-9.External Synchronization3-1 3-11.TriggerOutput.3-1 3-13. 0 perating Procedures. . . . . . .

9、 . .3-1 .4-1 . .4-1 . .4-1 4-1 4-1 4-1 . .4-1 . .4-1 .4-1 . .4-1 .4-1 .4-1 .4-3 .4-3 .4-3 .4-3 .4-4 4-4 II III IV ii GENERALINFORMATION. 1-1.Description. 1-4.Instrument Application . 1-6.Equipment Available utNotSupplied. 1-8.InstrurnentandManual Identification. 1-12.Inquiries. PRINCIPLES OF OPERATI

10、ON. 4-1.Introduction. 4-3.Block Diagram Description. 4-5.Fine-Frequency Control. 4-7.CurrentSources. . . . . . 4-9.Coarse-Frequency Control . 4-11.Schmitt Trigger. 4-13.Switching Circuitry. 4-15.OutputCircuits. 4-17.Synchronization Circuit. 4-19. Circuit Details. 4-21.Coarse-FrequencyControl. 4-25.F

11、ine-Frequency Control. 4-28.Schmitt Trigger Circuit 4-30.Switching Circuit. 4-32.OutputCircuits. 4-39.Synchronization. 4-43.Power Supplies. .1-1 .1-1 .1-2 .1-2 .1-2 .1-2 V VI VII VIII PERFORMANCE CHECKAND ADJUSTMENTS5-1 5-1.Introduction. . . . . . . . . . . . . . . . .5-1 5-3.Required Test Equipment

12、5-1 5-5.PerformanceCheck.5-1 5-6.Procedure5-1 5-8.Frequency Check5-1 5-9.Symmetry Control Check5-3 5-10.Synchronization Check5-3 5-11.600-0hmOutputCheck5-4 5-12.RisetimeandFalltime5-4 5-13.50-OhmOutputCheck . . . . . . . . . .5-4 5-15.Symmetry (10 MHz)5-5 5-16.TriggerOutputCheck5-5 5-18. Adjustments

13、5-5 5-21.Power Supply Adjustment5-7 5-22.Frequency Adjustment5-7 5-23.Synchronization Adjustment5-8 5-24.PulseAmplitude600-0hm OutputAdjustment5-8 REPLACEABLE PARTS6-1 6-1.Introduction6-1 6-4.Ordering Information6-1 MANUALCHANGESANDOPTIONS7-1 7-1.ManualChanges7-1 7-3.Older Instruments7-1 7-5.Options

14、.7-1 7-7.Special Instruments7-1 SCHEMATICSAND TROUBLESHOOTING8-1 8-1.Introduction. . . . . . .8-1 8-3.Reference Designations8-1 8-7.Component Identification8-1 8-9.Repair and Replacement8-1 8-11. Servicing Etched Circuit Boards8-1 8-14. Troubleshooting8-1 Model 211BListofIllustrations ListofTables L

15、IST OF ILLUSTRATIONS FigureTitlePageFigureTitlePage 3-1.Front-PanelControls and Connectors3-0 4-1.Model 211B Block Diagram.4-0 4-2.SchmittTrigger Operation . . . . . . . .4-2 5-1.Typical Waveform Characteristics5-1 5-2.Frequency Check TestSetup5-3 5-3.Synchronization TestSetup5-3 5-4.600-0hmOutputTe

16、stSetup5-4 5-5.50-OhmOutputTestSetup5-4 5-6.TriggerOutputTestSetup5-5 5-7.ComponentAdjustment Location5-7 .8-3 .8-3 .8-3 Pulse Generator Troubleshooting Tree -70-VoltsSupply Troubleshooting Tree -20-VoltsSupply Troubleshooting Tree. 50Ohms-600OhmsOutput Troubleshooting Tree8-4 ChassisComponentIdenti

17、fication - TopView8-4 ChassisComponentIdentification - Bottom View . . . . . . . . . . . . . . . . . . .8-4 AttenuatorAssembly A1 Schematic85 Power Supply Schematic8-5 Assembly A2ComponentIdentification8-6 Test Point Waveforms8-7 Frequency Control Schematic8-7/8-8 OutputCircuitry Schematic8-9 8-6. 8

18、-7. 8-8. 8-9. 8-10. 8-11. 8-12. 8-5. 8-1. 8-2. 8-3. 8-4. .1-01-1.Model 211 BSquare Wave Generator LIST OF TABLES TableTitlePage 1-1.Specifications.1-1 2-1.Shipping Carton Test Strength.2-1 5-1.Required Test Equipment5-0 5-2.Frequency Check5-2 5-3.SelectedComponents. . . . . . . . . . . . . . . .5-6

19、Performance Check Record5-8a/b 6-1. 6-2. Reference Designators and Abbreviations. Replaceable Parts. .6-1 .6-2 7-1.Manual Changes . . . . . . . . . . . . . .7-1 8-1.Schematic Notes.8-0 8-2.Voltages withSchmittTrigger LockedinoneState. . . . .8-6 8-3.DCVoltage and Waveform Test Conditions8-6 iii Sect

20、ion I Figure1-1 Model2118 211BSQUAREWAVEGENERATOR HEWLETT.PACKARD OUTPUT SOg VERNIER AMPLITUDE IVACROSSSOllJ .S .os OUTPUT SOOg AMPLITUDE + TRIGGER OUTPUT TRIGGER POLARITY SYMMETRY _MULTIPLIER SYNC.INPUT . r t I a /. i LiNE PUSHON/OFF Figure 1-1. Model 211 B SquareWaveGenerator 1-0 I Model2118 SECTI

21、ON I GENERAL INFORMATION Section I Paragraphs1-1to1-3 1-1.DESCRIPTION. 1-2.TheHewlett-PackardModel2118SquareWave Generator(Figure1-1)isafully-transistorized, general-purposeinstrumentthatprovidesnegative square-waveoutputsignalsofvariable frequency,width, andamplitude.In addition,triggeroutputsignal

22、sof reversiblepolarityare providedforsynchronizing external circuitsorinstruments.The Model2118SquareWave Generator (hereafter referredtoastheModel 2118)isa free-running instrument.Itmaybesynchronizedwithan external sjgnal. The frequencyrangeoftheModel 2118is from1 Hzto10 MHz when terminated in a 50

23、-ohm load. The amplitudeofthe signalisvariablefrom0voltto-5 voltswithanadjustable pulsewidthof25%to75%ofthe period. The risetime orfalltimeoftheoutputpulseisless than 5 nanoseconds. When theoutputoftheinstrumentis terminated in a 600-ohm load, the frequency rangeisfrom 1 Hzto1 MHzwitha variable ampl

24、itudefrom0voltto -30volts. The adjustable pulsewidthisthesameasfor the 50-ohm termination. The risetimeorfalltimeofthe 60o-ohmoutputpulseislessthan70nanoseconds. Complete performance specificationsaregiveninTable 1-1. 1-3.A separatefacilityfortriggeroutputpulsesisalso provided. The triggeroutputpuls

25、esarecoincidentalwith theleadingedgeoftheoutputpulses at the 50-ohm connector.Thetriggeroutputcircuitisusedfor synchronizing external circuitsorinstruments. Polarityof the trigger pulsesisselective (either positiveornegative) andtheiramplitudeisgreater than 2 volts. The pulse widthislessthan 10 nano

26、seconds when terminated in a 50-ohm load. Table 1-1. Specifications REPETITION RATE AND TRIGGERING INTERNAL 50-ohmoutput:1 Hzto10 MHz, 7ranges. 600-ohmoutput:1 Hzto1 MHz, 6ranges. PeriodJitter:0.2%atanydutycycleand repetition rate setting. EXTERNAL Sync Input: sinewavesorpositive pulsesfrom1 Hz to10

27、 MHz; frequencyofsynchronizing signal mustbefrom105%to140%offrequency dial setting. Sensitivity: dc coupled, positive pulses,2Vpk; sine waves,4Vpk-to-pk. InputResistance: approximately500ohms. TRIGGER OUTPUT Width: 10 (5)nsat50%point. Amplitude:atleast2Vinto50 ohms. Timing:coincidentwithleadingedgeo

28、f50-ohm pulse. Polarity: positiveornegative. OUTPUT Symmetry: variablefrom25%to75%dutycycle. Polarity: negative. 50-OHM SOURCE PulseShape: (measured at5Vinto50 ohms). Risetime andFalltime:5ns. Amplitude:peak5Vinto50 ohms,10Vintoan opencircuit;outputcircuitprotected, cannotbe damaged by shorting. Att

29、enuator:0.05Vto5V, in a1,2.5,5sequence. Vernier:provides continuous adjustment between ranges. GOO-OHMSOURCE Risetime andFalltime:70nsinto600ohms;- SYNC CIRCUIT 600n OUTPUT AMPLIFIER ISYMMETRYI o IVERNIERIQ I IAMPLITUDEIQ I UPPER CURRENT SOURCE RAMP CHARGE SCHMITT TRIGGERI-J1.JL CIRCUIT 50n OUTPUTAT

30、TENUATORk AMPLIFIERL-_.J FREQUENCY1 (HZ) Q 1TRIGGER.1Q POLARITY I I FINE SWITCHING TRIGGER FREQUENCY OUTPUT CONTROL CIRCUIT CIRCUIT ISYMMETRYI Q LOWER CURRENT SOURCE RAMPDISCHARGE RAMPCAPACITOR: (COARSEFREQ;*: CONTRCL)I AMPLIFIER DEGENERATIVE FEEDBACKFOR LOWESTTHREE FREQUENCIES ( 4-0 I L.-I IMULTIPL

31、IERI6S5 ZlrS-C-7 Figure 4-1. Model 211B Block Diagram I Model 211 B SECTIONIV PRINCIPLESOFOPERATION SectionIV Paragraphs4-1to4-23 I 4-1.INTRODUCTION. 4-2.This section presents the theoryofoperationforthe Model211BSquareWaveGenerator. Thefirstportion contains a general descriptionofcircuitfunctions u

32、sing a block diagram(Figure 4-1)tosupplement thewritten description.Thesecondportionprovidesadetailed descriptionofthe operational theorywrittenforusewith the schematics whicharelocated in SectionVIIIofthis manual. 4-3.BLOCK DIAGRAM DESCRIPTION. 4-4.TheModel211Bconsistsofafine-frequency control,twoc

33、urrent sources, a coarse-frequency control, and aSchmitttrigger circuit. TheoutputoftheSchmitt triggerisappliedtothree amplifier circuits. Theamplifier circuitsproducesymetricaloutputpulseswhichare present at the 50-ohm, 60o-ohm, andTRIGGEROUTPUT connectors. 4-5.FINE-FREQUENCYCONTROL. 4-6.Thefront-p

34、anelcontrol,FREQUENCY(Hz), establishes the pulse repetition rateofthe square-wave generator by adjusting the bias appliedtothetwocurrent sources. 4-7.CURRENTSOURCES. 4-8.The current sources (referredtoasthe upper and lower current sources in the block diagram) operateas current regulatorsforthe coar

35、se-frequency control circuit. The upper current source provides the currentforcharging theselectedrampcapacitorinthecoarse-frequency controlcircuitand the lower current source establishesthe rateofdischarge. 4-9.COARSE-FREQUENCY CONTROL. 4-10. TheMULTIPLIERswitch,located onthefront paneloftheModel21

36、1B,selectsvarious resistance-capacitance networks which determine the slope ofthe ramp waveform. The various sawtooth waveforms developed by the ramp capacitance networks establishthe repetition ratefortheSchmitttrigger circu it. 4-11. SCHMITTTRIGGER. 4-12. The sawtooth waveformfromthe ramp capacita

37、nce networkalternatelycrossesthe upper and lower hystersis limitsoftheSchmitttrigger. This results in a square-wave outputat a repetition rate established by the coarse and fine frequencycontrolcircuits. The Schmitt-triggeroutput isappliedtotheoutputamplifiers. 4-13. SWITCHINGCIRCUITRY. 4-14. The sw

38、itchingcircuitiscontrolled by asignalfed backfromtheSchmitttrigger.Itregulates the chargeor discharge stateofthe selected ramp capacitor. 4-15. OUTPUT CIRCUITS. 4-16. The square-wave signalfromtheSchmitttriggeris amplified and shaped by the 50-ohm and 600-ohmoutput circuits. The triggercircuitdiffer

39、entiates theoutputofthe Schmitttrigger andreshapesthepulses.Polarityofthe trigger pulsesisselectable by switch action. 4-17.SYNCHRONIZATIONCIRCUIT. 4-18. TheModel211Bmaybesynchronizedfroman externalsource.Thesynchronizationsignalis differentiated and appliedtotheSchmitttrigger circu it. 4-19. CIRCUI

40、T DETAILS. 4-20. Refertothetimingsequence in Figure 4-2 and the schematics located in SectionVIIIofthis manual when using the detailed theoryofoperation. 4-21. COARSE-FREQUENCYCONTROL. 4-22. The coarse-frequencycircuitiscontrolled by the seven-positionMULTIPLIERswitchS5.Eachpositionof theMULTIPLIERs

41、witchselects the appropriate ramp capacitor(A2C11throughA2C16)forthe designated frequencyrange.When the 1M frequencyrangeisselected, anetworkconsistingofA2C8, A2C9, A2C10 and A2R31 isusedtodevelop the higher frequency involved. 4-23. Theselectedrampcapacitorwillchargeand dischargeataratedeterminedby

42、current-source transistors A2Q6 and A2Q7. TransistorA2Q6functionsas aseriesregulator in the current paththatcharges the selected capacitor. The charging rateofthe ramp capacitor forms the negative slopeofthe sawtooth waveform. The outputcurrentofA2Q6isdirectedtothe ramp capacitor bydiode A2CR 11. Tr

43、ansistorA2Q7functionsasaseries regulatorinthedischarge pathoftheselectedramp capacitor.The discharging rateofthe ramp capacitor forms the positive slopeofthesawtooth waveform. Diode A2CR 12 directs the discharge currentfromthe ramp capacitor throughA2Q7toground. 4-1 SectionIV Figure4-2 Mode1211B OUT

44、PUT CURRENT V-SOURCEr- (CHARGING) -:l -, I I I I I I SCHMITT I SWITCHING .J INVERTERTRIGGER CIRCUITI- QI3 CIRCUITRY Q8/Q9 QI4-Q16 * SELECTED RAMPCAPACITOR CURRENT r SOURCEf- (01SCHARGING) -20 OUTPUT 016 -5V OV Sf:T/- TRIGGER/ SWITCHING LEVEL CHARGINGRAMP0 ISCHARGINGRAMP CAPACITORCAPACITOR UPPER SCHM

45、ITT TRIGGER SWITCHINGOUTPUT LEVEL_014 INVERTEROUTPUT- 013 ZIIB-c-2 Figure 4-2. Schmitt Trigger Operation 4-2 I I Model 211B 4-24. Dual potentiometerR3determines thedutycycle foreachperiodofthe pulse repetition rate.Itcontrols the currentintheemittercircuitsofA2Q6and A2Q7. PotentiometerR3isadjusted b

46、y theSYMMETRYcontrol knobonthefrontpanelofthe instrument. Varying the SYMMETRYcontrolchangesthe rate at which the upper andlower hysteresis limitsoftheSchmitttriggerare crossedper repetitionpulse.This establishes theduty cycleforeachperiod. 4-25.FINE-FREQUENCYCONTROL. 4-26. Thefine-frequencycircuito

47、ftheModel21IB consistsofpotentiometer R2, A2R24,A2R25and A2Q5. PotentiometerR2isa 10:1 vernier controlled by the FREQUENCY(Hz)dialonthefrontpanelofthe instrument. The FREQUENCY (Hz) dial establishes the biasappliedtocurrent-control transistor A2Q5.Thebias onA2Q5 controls the voltage developedacrossr

48、esistors A2R24andA2R25. The voltages developedatA2R24and A2R 25formthebiasforcharge and discharge transistors A2Q6andA2Q7. The rate at whichA2Q6permits the ramp capacitortocharge and the rateatwhichA2Q7 permitsittodischarge determinethe repetition ratefor the instrument. 4-27. On the three lower fre

49、quencyranges(controlled by A2Cll,A2C12and A2C13), a degenerative feedback network consistingofA2Qlland A2Q12isusedto compensatefortheslowercharge and discharge rate required. Transistor A2Q12 inverts theemittersignalof A2Q13 and appliesittothebaseofA2Qll.The collector circuitofA2Q11controls the biasontransistorA2Q10. TransistorA2Ql0forms a low-impedance ground circuit forthe three