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OPER TING N SERVI E M NU L

OSCILLOSCOPE3 C

= 0_

H E W L E T T ~ P K R D

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... fOPER TING ND SERVICE MANUAL

MODEL 3 COS ILLOS OPE

SERIALS PREfiXED: 6 ....-

(for Oth.r S u i a l .p,.fix Insfru ,.nt ,S S u t i o n I And Appendix 1)

For lnalrumenls With Options,See SecUon I

1 . . . IUWUU_ ACII :A .D CO. ANY 2ISOI 011.01 U O A D . , U O U f O . A L U O U. . A, U.S.A.

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Table of Contents Model l30C

TABLE OF CONTENTS

5-55-55-5

5-55-55-55-5

5-35-35-35-45-45-45-45-45-55-5

Page5-25-25-25-25-25-3

5-16.5-17.5-18.5-19.5-20.5-21.5-22.5-23.5-24.5-26.

5-41.5-43.5-45.5-47.5-49.5-51.5-53.5-56.5-58.5-60.5-62.5-64.5-67.5-68.5-69.5-70.5-72.5-73.5-74.5-75.5-76.5-77.

Vertical Calibrator Vertical andwidth VerticalCommonMode RejectionHorizontal Sensitivity Horizontal Calibrator .Horizontal Bandwidth .Horizontal Common ModeReject ionPhase Shift . . . . .Triggering .Trigger Point and SlopeSweep CalibrationSweep Vernier Sweep MagnifierIntensity Modulation .Single SweepTroubleBhooUng

Isolating Troubles to a MajorSection .5-28. Power Supplies 5-29. Amplifiers .5-30. Sweep Generator5-31. Low Voltage Power SupplyTroubleshooting 5-33. Excessive Ripple . 5-35. Loss 1 Regulation .5-38. High Voltage Power SupplyT r o u b l e s h o o t i n g 5-9AmpWier Troubleshooting 5-9Unbalance 5-9

Gain 5-9Low-Frequency Noise 5-9Compression . . . . 5-9Sweep Generator Troubleshooting 5-9Repair and R e p l a c e m e n t 5-10Cathode Ray Tube Replacement . 5-10Adjustments . 5-10Required Test Equipment . 5-11Preliminary SeUings . . 5-11Group I Adjustments . 5-11High Voltage Power Supply . 5-11Astigmatism . 5-11Intensity Limit . 5-11Group n Adjustments . 5-11Vernler Balance . 5-11Coarse DC Balance- 5-11Output Stage Current . 5-11Gain . . . 5-12

Neutralization . . . 5-12Input Capacitance and AUenuatorFrequency CompensaUon 5-12

5-81. Group mActjustments 5-145-83. Calibrator . 5-155-84. Sweep Stability . . 5-155-85. Sweep Length . . 5-155-86. Sweep Time Calibration . 5155-87. Component Location- . 5-15

VI REPLACEABLE PARTS . . 6-16-1. Introduction . 6-16-4. Ordering Information 6-1

APPENDIX I MANUAL CHANGES 1-1APPENDIX II OPTIONS II-I

Section5-9.5-10.5-11.5-12.5-13.5-14.5-15.

3-33-33-33-43-43-43-43-54-14-14-144-4-4-14-24-24-34-34-34-34-44-44-44-54-54-555-55-15-15-15-1

3-13-13-133-33-33-33-3

Page1-1-1-1 21-21-22-12-1222-12-12-12-13-3-

SectionI GENERAL ll\ FORMAn O N . . . .1-1. Description 1-3. Manual Identification and Changes1-5. CRT Warranty .1-7. Equipment SuppHcd or Available1-9. Options Covered .

INSTALLATION . . . . .2 -1. Incoming Insp ection2-4. Rack Installation 2-6. ooling2-8. Power Requirement2-10. Instrument Ground2-12 . Repackagi ng fo r Shipment.2-15 . In sta lla tion of Amber Filter

III OPERATION . . . . . . .3-1. I n t r o d u c t i o n 3-3. Front and Rear PanelFamiliarization .3-6. Sensitivity. 3-8. DC Balance 3-10. Level3-12. Normal-Single3-14. Beam Finder .3-16. Ope ra tiona l Check3-18. Operating Procedures3-20. Internally Triggered SweepOperation .3-22. Externally Triggered SweepOperation .3-24. Single Sweep C4leration. . .3-26. DiHerentiallnput Operation3-28. X-Y Operation 3-30. Operating Considerations . . 3-31. Use of Amplifier andInputAC-DC3-33. Applying Input Signals

IV PRINCIPLES OF OPERAnON . 4-1. Introduction4-4. Low Voltage Power Supply4-6. -100 Volt Supply. . .4-8. +100 and +250 Volt Supplies4-10. +12.5 Volt Supply . . .4-12. High Voltage Power Supply4-15. Sweep Generator . .4-17. Trigger Generator 4-19. Gate Generalor . .4-21. Integrator 4-24. Sweep Termination andHold-Off .4-26. Free Run Circuit Operation4-28. Single Sweep ClrcuU . 4-30. Vertical Amplifier . . . . . 4-32. nput AUenualor . . . . .4-34. Differential Feedback Amplifier .4-36. Output Amplifier4-39. Hor izonta l Ampli fi er

V MAINTENANCE . . .5-1. I n t r o d u c t i o n 5-3. Performance Check5-4. General. . . 5-6. Preliminary Procedure5-7. Vertical Sensitivity5-8. External Callbrator

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Model13OC

LIST OF ILLUSTR TIONSList of mustrationsandTables

Number Title Page Number Title PageI-I. Model 130C Oscilloscope I-I 5-6. Vertical Amplifler, AI, Component3-1. Controls and Terminals (Vertical, Location - 5-165-7. Vertical Attenuator and AmplifierCRT Display and Power) 3-0 Schematic 5-173-2. Controls and Terminals Horizontal. 5-8. Sweep Generator CircuitWaveforms . 5-18Sweep, a nd Triggering) 3-2 5-9. Tr-igger Source-Level Switch, AI02.3-3. DC Balance Procedure 3-63-4. Internal ~ p with Internal Trigger 3-7 Component Location . 5-185-10. Sweep Generator, AI0l, Componut3-5. Internal Sweep with External Trigger 3-8 Loca11on . 5-183-6. Single Sweep q:teration 3- 5-11. Sweep Generator SChematic 5-193-7. Differential Operation 3-10 5-12. Sweep TIme Switch. A175.3-8. X V ~ r a t 1 o n 3-11 Component Location 5-204-1. Model 130C Overall Functional 5-13. Sweep TIme Schematic . 5-21Block Diagram . 4-0 5-14. Horizontal Attenuator, A202,4-2 . LV Power Supply Block Diagram 4-1 Component Lvcation. 5-224-3. HV Power Supply mock Diagram 4-2 5-15. Horizontal Amplifier, A201,4-4. Sweep Generator Functional Block Component Location. 5-22Diagram . 4-2 5-16. Horizontal Attenuator an d4-5. Vertical Amplifier Functional Block Amplifier Schematic. 5-23Diagram . 4-4 5-17. High Voltage Power Supply, A301.

Component Location 5-245-1. Model 130CTop View Cover Removed) 5-6 5-18. High Voltage Power Supply Schematic 5-245-2. Model 130C Bottom View Cover 5-19. Low Voltage Power Supply. A401,Removed) 5-7 Component Location. 5-255-3. Horizontal NeutralIzation Adjustment 5-20. Low Voltage Power Supply Schematic 5-25Waveforms 5-135-4. Hor izontal Attenuator Compensation 6-1. Modular Cabinet Replaceable Parts 6-0Waveforms 5-135-5. Vertical Attenuator. A2 Component n-1. Option SChematic Diagram n-ILocation 5-16 OpHon 06 Schematic Diagram n-I

LIST OF T BLESNumber Title1-1. pecif icat ions - . . . . .1-2. Equipment and Accessories Availabie1-3. Description of Options . . . . . .

01870-3

3-1.3-2.5-1.5-2.5-3.5-4.5-5.5....5-7.5-8.5-9.5-10.6-1.6-2.6-3.ll-1.

Common Mode Rejection . . . . .Characteristics and Applications forAmplifier and Input Coupling CombinationsRequired Test Equipment. . . . . . . .Vertical/Horizontal Sensitivity CalibrationSweep Calibration . . . . . . .Sweep Magnifier CalIbration . .Ripple Measurements. . . . . . .Low Voltage Supply TroubleshootingSweep Generator Troubleshooting .Low Voltage Power Supply AdjustmentInput Capacity Adjustment. . . .Sweep Time Calibration . . . .List of Reference Designators an dAbbreviations. . . . .Replaceable Parts Code List of Manufacturers . Replaceable Parts f or Opt ions .

Page1-01-21-23-43-45-05-15-35-55-55-85-10

5-115-145-15

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Section ITable 1-1Table 1-1. Specifications

Model 130C

SWEEP GENERATORINTERNAL SWEEP: 21 ranges, 1 Ilsec/cm to 5sectcm, accuracy within :1:3 . Vernier providesoontinuous adjustment between ranges and extends slowest sweep to at least 12.5 sec cm.MAGNIFICATION: X2, X5, XIO, X20, X50 overallsweep accuracy within :1:5 for sweep rates whichdo not exceed a maxinwm rate of 0.2 /lsec/cm.AUTOMATIC TRIGGERING: Base lineisdisplayedin the absence of an input signal.Internal: 50 cps to 500 kc s igna l causing 0.5cm or more vertical deflection and also fromline voltage.

External: 50 cps to 500 kc, 0.5 volts peak-topeak or more.Trigger Slope: Positive or negative slope ofexternal sync signals or internal vert icaldeflection signals.AMPLITUDE SElECTION TRIGGERING:Internal: 10 cps to 500 kc, 0.5 cm or morevertical deflection signal.External: DC dc to 500 kc or AC 20 cps to500 kc coupled, 0 .5 volts peak-to-peak or

more.Trigger Point and Siope: Internally from anypoint of the vertical waveform presented onscreen or oontilU1OUsly variable from +10volts to -10 volts on either positive or negative slope of external signal.SINGLE SWEEP: Front panel switch permits Singlesweep operation.VERTICAL AND HORIZONTAL AMPLIFIERSBANDWIDTH:DC Coupled: to 500 kcAC Coupled input : 2 cps to 500 kc.AC Coupled amplifier : 25 cps to 500 kc at 0.2mv/cm sens it ivi ty . Lower cut-off frequencyfco is reduced as sensitivity is reduced;at 20 mv/cm fco is 0.25 cps. On less sensitive ranges, response extends to DC.

SENSITIVITY: 0.2 mv/cm to 20 v/cm. 16 rangesin 1,2,5,10 sequence with an attenuatoraccuracywithin :1:3 . Vernier permits contilU1OUs adJustment of sensitivity between ranges and extendsmininwm sensit iv ity to at least 50 v/cm.INTERNAL CALIBRATOR: ApproXimately 350cpssquare wave. 5 mV:l:3 . Automaticallyconnectedfor checking gain when the sensitivity is switchedto CAL.INPUT IMPEDANCE: 1 megohm shunted by 45 pf,constant on al l sensitivity ranges.MAXIMUM INPUT: 600 v peak dc + ac .

1-0

BALANCED INPUT: On al l sensitivity ranges.COMMON MODE REJECTION: dc to 50 kc Atleast 40 db from 0.2 mv/cm through 0.1 v/cmsensitivity; common mode signal not to exceed 4volts p-p. At least 30 db from 0.2 v/cm to 20

v/cm; common mode signal not to exceed 4 voltsp-p on O. 2 v/cm,40 v p-p from. 5 v/cm through2 v/cm, or 400 volts p-p from 5 v/cm through20 v/cm.PHASE SHIfT: With :1:10 relative phase shift atfrequencies up to 100 kc with verniers in CAL

position and equal inpJt sensitivities.GENERALCALIBRATOR: Approximately 350 cps, 500 mv:1:2 available at front panel.CATHODE RAY TUBE: hp Type 5083-0353 P31

Internal Graticule, mono-accelerator, 3000 voltsacceleratingpotential . P2, P7, and phosphorsare availabie. Equipped with non-glaring safetyglass faceplate. Amber filler supplied with P7.INTERNAL GRATICULE: Parallax-free 10 cm x10 cm marked in cm squares. 2 mm subdivisions on major horizontal and vertical axis.BEAM FINDER: Depressing Beam Finder controlbrings trace on CRT screen regardless setting of balance, position or intensityoontrols.INTENSITY MODULATION: Terminals on rear;+20 volt pulse blanks CRT at normal intensity.POWER: 115 or 230 volts :1:10 50 to 1000 cps.Approximately 9 watts.DIMENSIONS:

r----- t ~ . .

WEIGHT: Net, 31lbs 14kg ; Shipping, 38 lb s (1 1, lkg .

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Model l30C

SECTION IGENERAL INFORMATION

Section IParagraphs 1-1 to 1-4

DESCRIPTION1-2. The Hewlett-Packard Company Model 130COscilloscope shown in Figure 1-1 is a versatileinstrument for laboratory production line, or industr ial process measurements. Horizontal and verticaldisplay sensitivity is 200 microvolts pe r centimeterand the measurement bandwidth is 500 kc. A sweepmagnifier of up to X50 allows expansion of a trace tothe equivalent of 500 centimeters fo r viewingwaveformdetails. Slngle sweep operation is also provided toallow observation of single shot phenomenaor randomoccurrence events. Trigger adjustments are minimizedby USing either a front panel trigger-level control withpreset stability or automatic triggering which providesa base line even with no inp.1t signal. Also for fastexpanded sweep times where the automatic triggerbaseline would be too dim, a free run m:lde may beused to provide a bright base line display. An of screen trace may be easily located by depressing afront panel Beam Finde r Button which returns thetrace to the screen regardless of intensity, balance,or pos it ion set tings. Careful engineering design ofthe Model 130C has resulted in high stability of gainand minimal DC d rilL TheModel13OC ha s an internalgraticule CRT, which eliminates parallax ambiguity

and minimizes reflections and glare. TheinstrumentIs packaged in the hp modular cabinet, allowingquick,easy conversion to rack mounting and also prOVideseasy accessibility to internal circuits for maintenance.M NU L IDENTIFICATION AND CHANGES

1-4. Information in this manual appl ies d irect ly toModel 130C instruments with a serial prefix of 644see manual title page). The serial prefix of a hpinstrument is the first three digits 1. e. those beforethe dash, as XXX OOOOO ofthe serialnumber stampedon a plate attached to the rear panel. Appendix Icontains information on changes required to adaptthis manual to an instrument with any serial prefixlisted there. A separate change sheet included withthis manual) provides informationto adapt this manualto an instrument with any serialprefixother than thosementioned in this paragraph or Appendix I. Any errorsin this manual when wasprintedare called ERRATA,and these corrections will appear onlyon the separatechange sheet included.

Note: Instruments with serial prefix 226-,235-, or 248- require a dif ferent manual,written for the 235- prefix hp Part No.130C-901), for correct information.

Figure 1-1. Model13OC Oscilloscope01879-5 1 1

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Model l30C

Table 1 2 Equipment and Accessories AvailablelUOA Clip-on AC CUrrent ProbelUIA Current AmplUier tor IUOA)l0001A C Compensated 10:1 divider probe5 cable)l0 001B/D Compensated 10:1 divider probe

(10 ft cable)IOOO2A C Compensated 50:1 divider probe(5 cable)IOOO2B D Compensated 50:1 divider probe1 cable)l0025A General purpose straight-through

probe10100B 100 ohm termination for lUOA10U1A Adapter, BNC female to dual bananaplug

Section 1Paragraph 1-5 to 1-101-5. T W RR NTY16. The cathode ray tu e used in the Model l30C iscovered by a warranty separate from the inBtrumentwarranty. The CRT warranty is included at the backo f the manual to r your use in theevent of CRT failureduring the warranty period.1-7. EQUIPMENT SUPPLIED OR

V IL IU

19 . OPTIONS OVERED1-10. ThiB manual applies to Model 130C instrumentswith the options listed and described in Table 1-3.Refer to Appendix II fo r complete information on al lq tions.

1-8. Each i ns trumen t I s supplied with detachablepower cable and raCk-mounting hardware. Otherequipment available to r use with the Model l30C islisted in Table 1-2.

Table 1-3 . Descr ip tion of OptionsOption Number Description

External graticule with scale l ight in lieu of internal graticule. Specifyphosphor: PI, P2, P7, PU, P31 available.06 Rear terminals in parallel with front panel terminals. 11U ee-pin AN-typecoonectors (supplied) for horizontal and vertical signal inputs; BNC con-nector for tr igger soorce.13 6-31/32 in x 19 n x 3/16 in. front panel, suitable for attaching yoor own

handles.

1-2 018792

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Section mFigure 3-1 Modell30C

@ ~ ~ - ~ - --- iI j ]@ (@ @ @ ~ - . c @ @)

3

4 3 2 1

1. Power on indicator. Glows when AC wer isswitched on.2. BEAM FINDER. RebJrns oft-screen trace toscreen and intensifies trace s ee paragraph3-14).3. FOCUS. Adjusts trace sharpness.4. INTENSITY. Adjusts trace brightness. Whenrotated fully counterclockwise, turns power off.5. CALIBRATOR. Provides 500 mv p-p squarewave fo r compensating probes or fo r us e in

external circuitry Zsource 10 KO).

6. Vertical -input terminal. Negative-going sIgnals applied to this terminal cause upwarddefiection o f the trace.

7. Vertical +input terminal. Positive-going signals applied to thi s t ermina l cause upwarddeflection of the trace.

8. INPUT AC-DC. Selects direct or capacitivecoupling of the input s igna l see Paragraph3-31).

9. AMPUFlER AC-DC. Selects internal director capacitive coupling on 7 highest sensitivity ranges see Paragraph 3--31).

10. Vertical DC BALANCE. Adjusts internalDC levels to minimize trace shift when changing sensitivity ranges or using VERNlER).11. Vertical POSITION. Moves trace vertically.12. Vertical SENSITMTY. Sets the deflection

sensitivity of the trace. Calibrated SENSITIVITY when VERNIER is Cully cw detentedposition .

13. VERNIER. Variable portion reduces deflection sensitivity for range selected. AllowscontirRlOus adjustment between ranges; extends minimum sensit ivity to 50 V/CM. Calibrated SENSITIVITY wben set to CAL.

3-0Figure 3-1. Controls and Terminals Vertical, CRT Display and Power

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Model13OC

SECTION IIIOPERATION

SectionmParagraphs 3 -1 to 3-11

3-1. INTRODUCTION3- 2 The Model l30C may be u sed in either of twou i mode. of operation: 1 external signal to verticalinput with internal horizontal sweep or 2 external81gnala: lnto both horIzOntal and vertical inputs. Thedeflection .ensitivity and bandwidth of the two amplifiers is indentical and the input to eachampltner maybe e asi ly changed to allow either single-ended inputsor balanced 1npUts. A choice of either AC or DCcoupling, at the input an d internally in th e ampWler,is provided for both horizontal and vertical circuits.The internal borizontalsweep baB 21 callbratedsweept imes from II Mc/cm to 5 sec/cm with a vernier [orcontinuous coverage which can extend th e slowestlIWeep speed to 12.5 .ec/cm. Each sweep t ime maybe magn1f1ed by choosing either X2, XS, XlO, X20,or X50 rq The sweep can be triggered internallyfr om the vertical deflection signal or the Une frequency; external trl.g:ers can also be used, eitherAC or DC coupled to t he sweep circuit See Paragraph S 16 [o r a brief operational check.3-3. fRONT ND RI R P NEL

f MILI RIZ TION3-4. FRONT PANEL. Figures 3-1 and 3-2 identifyand brief ly describe the Model 130C f ront panei controls, connectors, ete. To aid in proper operation,Paragrapba: 3-6 through 3-15provideamore extensivedescript ion of 80me front panel controls. Note thatcontrols fo r vertical and horl.zontallnputs are identicalin function and appearance except that the oorlzontalSENSITMTY has six internal sweep positions.3-5. REAR PANEL. The power cord connector,line fuse, and 115-230 volt switch are described inParagraph 2-8. TRACE Al.JGN is a screwdriveradjustment to align th e CRT trace with th e graticule.Relocating or reorien ting the instrument within amagnet ic f ield such as the earth's tleld may requireadju8trnent of tblB control to maintain exactalignmentThe Z AXIS [NPUT allows trace intensity modulationby applylng a modulating signal with the shorting link.removed. At normal trace intensity (set on frontpanel), a +20 volt pulse will blank the trace. notusIng th e Z AXIS INPUT terminals, be sure theshorting link is in place.S 6 SENSITMTY.3-1. SENSITIVITY control (vertical or horizontal)seta the deflection sensitivity of the display In mllUvolts per centimeter or volts per centimeter, WhenVERNIER is in CAL. position. In BAL position ofthe SENSITMTY switch, the ampWier lnp.lt I sgrounded. and the input terminals are opened, tofaclitate setting of the ampllfler DC balance (seeParagraph oo and Figure 3-3). IntheCAL. position.an internal callbrator signal is applied to th e ampllflerinp.l t and the calibration accuracy can be checked bynoting the defiection on the CRT as follows: I with1819 1

no vertical 1npJt, when HORIZONTAL SENSITIVITYand VERNIER a re s et to CAL, a horizontal l ine 5 cmlong should be diBplayed if no t the probable cause 18m d ~ s t m e n t of the horizontal gain; see Section V ,2 with no horizontal1qlut, when VERTICAL SENSITIVITY is set to CAL, a verticalllne 5 cm long abwldbe diBpiayed (l l not, the probable eatUle 18 mlsadfuSt-ment of the vertical gain; seeSectionV ; an internallIJWeep time is used a 5 cm p-p square wave 8boU1d bedisplayed. The INTERNAL SWEEP pos it ions ofHORlZONTAL SENSITIVITY can beused to effectivelyexpand a trace from two screen diameters In X2 tofifty screen diameters in X50.3-8. DC BALANCE.3-9. The DC BALANCE control bas a range ofabout40 screen d iamete rs , i .e . i t can effec tive ly moveth e trace about 400 cm. It s purpose 18 to set internalampllf1er Operating coDdiUons such that there is amJn1m.un trace 8h1tt as SENSITIVITY is switchedfrom range to range, or when VERNIER 18 used.This is especlally important at the more sensttiveranges (toward 0.2 MY/CM when the AMPLIFIERswitch is set fo r DC coupIJ..na. Fleure 3-3 providesthe procedure tor setting vertical and horizontal DCBALANCE p rope rly. The set ti ng may change duringwarmup or extended periods of operat ion and requireperiodic readjustment when the instrument is usedDC coupled at high sensitivities.

NoteDC BALANCE is a fine controlandshouldadditional range b e requtred to balance th eampillier a coarse DC balance ad U8trnentis located within the instrument (see SectionV for proce4'lre).

3-10. LEVEL.S 11 Through it s variable range, LEVEL controldetermines the point on the triggering-source waveform at which the sweep starts. This trigger levelis variable whether using external, internal, or linefo r th e trigger 8OUrce. By proper sett ing of LEVELth e sweep may be s ta rt ed a t any point on a verticaldeflection waveform (deflecUon> 0.5 cm when trig-gering internal ly or at a point between +lOv to -lOvon an external trigger signal. The + or - on theLEVEL control refers to the direction th e tr igerlngpoint MOVetI on a waveform, regardless of theSWPEsetting (fo r ezample , turning LEVEL ccw movestrtggering level toward a more negative point on thetrl.g:ering waveform). When LEVEL is Bet ful lycounterc1ockwl8e to AUTO (detented positionJ, tbelIWeep will free ru n at a low repetition rate provtd1nga bueUne in the absence of a triggering Itgnal andthen provide automatic triggering of the sweep whena signal within apecW.cat1ons I s applied. . In AUTO anexternal trigger is always AC coupled. When LEVELis set fully clockw18eto FREERUN (deteDtedposition),

3-1

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Section mFigure 3-2 Modell3OC

KJ m J __~ @ @ . @

-

1. AMPLIFIER AC-DC. Selects internal director capacitive coupling on 7 highest sensitivityranges see Paragraph 3-31 .

2. Horizontal inp.1t terminal. Positive-goinKsignals applled to this terminal cause the traceto deflect to the right.

3. Horizontal -input terminal. Negative goingsignals appUed to thi s t ermina l cause thetrace to defied to the right.4. INPUT AC-DC. Selects direct or capacitive

coupling the lnp.1t signal see Paragraph3-31 .5. Trigger Input Terminal. Accepts externaltrigger signal.6. Trigger Input AC-DC. Selects direct or capacitive coupling external trigger signal al-ways AC coupled When LEVEL se t to AUTO .7. NORMAL-SINGLE. selecta nonnal sweep or

s ingle sweep operation s ee paragraph 3-12 .8. LEVEL. Selecta free-running, automatietrlggering, or variable ampl1tude triggering seeParagraph 3-10 .Q TRIGGER SOURCE-SLOPE. Selecta sourceof sweep trigger signal and slope on whichtrigger occurs. INT. triggers with internal

vertical signal; LINE triggers on power Ilnewaveform; EXT. triggeu on signal at triggerinput terminal.10. ARMED. Indicator gloWs when sweep is readyfor trigger in SINGLE lJWeep operation.11. SWEEP TIME. Selects time unit per centi

meter of sweep. Calibrated sweep timewhen VERNIER is fully cw detented poaltion .12. VERNIER. Variable portion reduces sweeptime pe r centimeter for selected range. Allowscontinuous adjustment betweEl1 ~ s extendsslowest sweep speed to 12.5 sec/em. Calibrated sweep when se t to CAL.13. Horizontal POSITION. Moves trace bortz-ontally.14. Horizontal SENSITMTY. t the deflectionserudttvity of the trace an d selects internalsweep. Calibrated S NSITIVITY when VER-NIER I s tully cw detented position .15. VERNIER. Varlable portion reduces defiec tion sensitivity for range selected. Allowscontinuous adjustment between ranges; extends minimum senSitivity to 50 V/CM. Calibrated SENSITIVITY when se t to CAL.16. Horizontal DC BALANCE. Adjus ts internalDC levels to mln1mize trace shUt when changing sensitivity ranges or using VERNIER .

Figure 3-2 . Controls and Termtnals Horizontal. Sweep, and Triggering3-2 0187Q1

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ModellSOC

the horizontal sweep i s fre e running at a rate determined by t he sweep time setting, and cannot be controlled by a triggering signal.3-12. NORMAL-SINGLE.3-13. When NORMAL-SINGLE is set to NORMAL, thehorizontal sweep operates recurrently as determinedby the triggering signal. In SINGLE position, thesweep can be t riggered only once, after which t islocked ou t until armed by switching to NORMAL andback to SINGLE. The ARMED light is on in SINGLEposition when the sweep is armed and ready to betriggered. To use the singlesweepoperation, LEVELmust be set anywhere in it s variable range, e notin AUTO or FREE RUN. See also paragraph 3-24.3-14. BEAM FINDER.3-15. This paragraph will exp lain operation andfunction o f the BEAM FINDER and also discuss somecauses of no CRT display. The BEAM FINDER pushbutton is useful for locat ing a display which is notvisible on the CRT for these common reasons: 1 DCunbalance in ampli fier at high sensitivities, andAMPLIF1ER DC coupling , 2 amplifier being overloaded at input, or 3 intensity set too low. Depressingthe BEAM FINDER defocuses and intensUies theCRTtrace (o r spot , and reduces the sensitivity of bothhorizontal and vertical ampilliersso the trace appearson-screen regardless of INTENSITY, DC BALANCE,and POSITION settings. The beam finder reducesamplifier gain enough to overcome the eUectivepositioning range of tbe DC BALANCE controls, whichamounts to as much as 40 screen diameters I.e.400 cm at tbe highest amplifier sensitivity, as compared to only 2 screen diameters 20 cm range forPOSITION contr ol. Because of the desensitizationrequired to overcome DC BALANCE range, the POSITION controls are essentially inoperative when theBEAM FlNDER is depressed. Therefore, alWays setPOSITION to approximately 120 clock beforeusingthe beam finder. To get maximum usefulness fromtbe BEAM FINDER, the selected ampl1fler sensitivityand coupling should also be considered. At higheramplifier sensitivities i.e. toward 0.2 MY/CM , AMPLIF1ER 18 set to AC, a DC unbalance in t heamplUier cannot cause an oU-screen deflection. Instead, the most probable cause is amplifier overloadby the input signal or intensity may be se t too low. Athigher sensitivities with amplifier DC coupling, andtrace not on screen, switch AMPLiFIER to AC and trace now appears on-screen then a DC Unbalanceexists to make DC BALANCE setting see Figure3-3).At lower amplifier sensitivities, DC unbalance iseliminated as a cause to r oU-screen trace. Anothercause o f no display is non-triggering sweep and thiscan be checked by noting if trace appears when theautomatic triggering mode is used. (see Table 1-1 to rspecifications).3 16 OPERATIONAL CHECK3-17. This procedure may befollowedtocheckoperation of most controls and circuits of the Model 130C.

a. Turn INTENSITY to about 12 o clock position(bJrns AC power on . Allow severalrninuteswarmup.01879-1

Section mParagraphs 3-12 to 3-25b. Set al l VERNIERs to CAL.c. Set horizontal and vertical AMPLIFIER andINPUT to AC.d. Set vertical SENSITIVITY to CAL.e. Set the horizontal SENSITMTY to tNTERNALSWEEP Xl and setSWEEPTIME lo 1MILLISECONDS/eMf Set TRIGGER SOURCE-SLOPE to INT. LEVELto AUTO, and NORMAL-SINGLE to NORMAL.g. Adjust both POSITION controls to center display.Adjust FOCUS for sharp, dear trace.h. The height of the square wave displayed ~ ube 5 cm.

3 18 OPERATING PROCEDURES.3-19. ParagraphS 3-20 through 3-29. and the figuresreferenced, describe procedures for various operat ing modes and applicationsoftheModel13OC. Beforeoperating the Oscilloscope and following these procedures. t is recommended that Paragraphs 3-3through 3-15 be read to become completely familiarwith front panel controls. Also, Paragraphs 3-31 and3-33 describe considerations which are important inmost measurements with the Model 130C3-20. INTERNALLY TRIGGERED SWEEPOPERATION.3- 21. In lh1s type operation , the sweep is triggeredinternally f rom the ver tica l signal or Une frequencyand the signal to be observed is applied to the verticalinput; Figure 3-4 provides a step by step procedure.Witb TRIGGER SOURCE-SLOPE set to INT. or -,the sweep is triggered when the vertical signal inputcauses a vertical deflection of 0.5 cm or more. WithTRIGGER SOURCE-SLOPE set to LINE or -, thesweep is triggered from the AC power linewaveform.Function of LEVEL control is described in Paragraph 3-10.3-22. EXTERNALLY TRIGGERED SWEEPOPERATION.3-23. In this type operation the sweep is triggeredfrom an externally applied signal and the signal to beobserved is applied to tbe vertical input; Figure 3- 5provides the step by step procedure. With TRIGGERSOURCE-SLOPE se t to EXT. or the horizontalsweep is triggered by a signal of 0.5V p-p or more.applied to the trigger input t ermina ls . F igure 3-5explains us e and specWcations for AC or DC triggerinput coupling; LEVEL i s sc t to AUTO, the externaltrigger signal 18 always AC coupled. Function ofLEVEL control 18 explained i n Paragraph 3-10.3-24. SINGLE SWEEP OPERATION.3- 25. A step by step procedure for obtaining singlesweep operation is contained in F igure 3-6. Thismethod is useful for observing single shotphenomenaor r andom even ts. With single sweep operation, thesweep occurs lUst once and cannotbe retriggereduntilmanually rearmed. See a lso Paragraph 3-12 forexplanation of the SINGLE-NORMAL switch.

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Section mParagraphs 326 to 3--323-26. DIFFERENTIAL INPUT OPERATION.3-27. Balanced inputs are provided on all SENSITIVITY rang811 of both horizontal and vertical deDection ampl1t1ers which allows meaaurement of thedltterence between two sl.gna1a. Thi8 18 called dif-ferential input operation and in thi8 mode the two81gIuW1 are wbtracted algebraically and the difference 18 diBplayed as a Bingle trace. This type ofoperation ellm1nateB 8tgnal8whicb are com mon to bothlnpuu refer red to as the common mode signal) anddisplays signals pecullar to only one inprt. Figure3-7 prov1d.88 a step by step procedure fordWerentialoperat ion of the Model 13OC Commonmode rejectionezpreued in decibels reprceents the alaUty of theamplllier to attenuate the common mode signal andthis 18 summarized in Table 3 .1 along withtbe maxi-mum allowable peak-to-peak common mode signal tomaintain these rejection ratios.

Table 31. Common Mode RejectionMinimumMa:.mwm Common ModeSENSITIVITY Peak to-Peak:

In t RejectionDC to 50 kc)0.2 mV/CM thru 4 volu 40 db0.2 VOLTS/CM0.5 VOLTS/CM 40 volts 30 dbthru 2 VOLTS/CM5 VOLTS/CM thru 400 volts 30 db20 VOLTS/CM

Modell3OC

3.28. x x OPERATION,3-29. In the X-Y mode of operationthe lnternalsweep18 disabled and external signals are applied to bothth e horizontal and vertical amplifiers. Figure 3-8provides an operating procedure fo r obtainlng Lissa-jous patterns or X X plots. Tbe XY display is agraph of tbe vertical . tgnal va . the horizontal s1gnal.and laUlJeful to r d18playing plots ofvo1tagevs. current.byBteresis 100118 preesure VB Btra1n using straingages), etc. Anotber important appllcation fo r X Xoperation is to make phaae shift measurements. Tbevertical an d horizontal ampllfienll b a n identicalcharacteristics and less than relative pbue shiftfrom DC to 100 kc when VERNIERs a re s et to CAL.and amplifier SENSITIVITY settings are equal. Application Note 29 describes a convenient methodto r measuring pbUe sb1tt. When meaaur1ng pbaaesbitt at very low frequencies, use both AMPLlF1ERDC and INPUT DC to eliminate phaae dU erencescontributed by the AC coupling capacitors.3 3 0 OPER TING CONSIDER TIONS

3-31. USE OF AMPLIFIER AND f fiPUT AC-DC.S.32. DUterent combinations of AMPLIFIER and INPUT coupling will provide various advantages in tbecharacterlBUC8 of operation depending on the wave-form to be displayed. Table 3-2 summarizes thetypical lowfrequency 3 db cutoff point with differentSENSlTMTY and coupll..ng settingS; typical appllcationa are a 1Io given. The b 1gh frequency 3 db cutoffpoint JI 500 kc in all cases. For SENSITIVITY settingsfrom 5 mV/CM througb 20 VOLTS/CM,AMPLlF1ER

Table S 2 CharacterlBtics and Appllcations fo r AMPLIFlER and INPUT Coupling Comb1nationsSEN MnNTrY(mV/CM)

AMPLIFIER INPUT .2 I 2 10 20 50mV to 20 VOLTS/CM APPLICATIONSAC DC 2 . 10 2 I 2 DC For observIng the DC com-cps cps cps cps cps cps cps ponent of waveforms;typical drift 0.3 mVper

half hour.AC AC 2 . For observing small, low-cps cps cps frequency components of 10 cp s waveforms without driftAMPUFIER SWitch has noeffect on V/CM ranges)

For generalpurposemeasurement of AC wave-DC AC 10 cp s forms; blocks DC compo-nents; maximum input Is600 volts peak AC DC)For obeerv1ng very lowfrequency components atDC DC DC bilh sensitivities whenlarge DC level 18 preseDt.Notemaximum lnprt ltm1t

3-4 01879--1

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Modell30C

coupling switch bas no effect; coupling is always for these ranges WIlen using ampUfier AC couplingin the moat sensitive range of 0.2 mV/CM at lowambient temperatures the amplifier sensitivity isreduced slightly The reduction is noticeable only attemperatures below ~ and reaches m ximum ofapproximately at O C3-33. APPLYING INPUT SIGNALS.3-34. For measuremenu at high amplifier sensi-tivities and high impedance levels a shielded inp.tt

01879-1

Section mParagraphs 3-33 to 3-34connect ion to the OscUloscope is desirable The 4Model 1011lA Adapter provides a shielded bananapost to female BNC connector. Two adapters can beused to provide shielded connections for differentiainput operation Frequency compensated divideprobes liSted in Table 1-2 can be used to providea higher inprt impedance and thus reduce loadingeUects on the circuit where measuremenu are made.The 500 mV CALIBRATOR output on the Model l30Cfront panel maybeusedfor probe compensation just-ment described in the Operating Note for the probe The Model 10InA Adapter is necessary for COMectingthe divider probes to the Model 130C input terminals

3-5

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Mode1130C

3

~

4 8

1

_._ ~ _ ;..\ ,

9

Section mFigure

5

108

1 8 1 9 ~ 1

1 Connect vertical signal to input. For differ-ential input se e Figure S 1.

2 SetSENSITIVITY for desired verticaldeflect:ioo3. Set VERNIER to CAL fo r cal1brated sensitivity.4 Se t SENSITIVITY to INTERNAL SWEEP Xl .5 Bet TmGGER S O U R C E ~ S L O P E to NT orINT . To trigger on power l ine waveformsset TRIGGER S O U R C E ~ S L O P E to LINor L N E ~6. Set LEVEL to AUTO1. Set NORMAL SINGLE to NORMAL8 Set SWEEP TIME for desired presentation ofwaveform9 Set VERNIER to CAL for calibrated sweep

lime10 Adjust LEVEL to trigger at a desired pointon trlggerlng waveform

Figure 3 4. Internal Sweep with Internal Trigger3

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Sect10n mFigure 3 5

8

3

Mode11SOC

2

5@ @ @

@ IMe- -.

8

1. Connect vertical 8ignal to input2. Se t SENSITIVITY fo r desi red vert ica l deflection3 Set VERNIER to CAL for callbrated 8enBitivtty.4. Set SENSITIVITY to INTERNAL SWEEP Xl5 Set TRIGGER SOURCE SLOPE to EXT or

EXT 6. Set AC DC to either AC or DC fo r triggersignal above 20 cps; set to DC fo r triggersignal from DC to 2 cps.7. Connect trigger signal to input8 Se t NORMAL SINGLE to NORMAL.9. AdjuSt LEVEL to obtain a diaplay On CRTDo not use AUTO fo r trigger below 50 cps10. Se t SWEEP TIME fo r desired presentation ofwaveform11. Se t VERNIER to CAL f or cal ib ra ted sweeptime12. Ad U8t LEVEL to trigger at desired point ontriggering waveform

Figure 3 5 Internal Sweep with External Trigger01879 1

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Model13OC

01879-1

5

4

1 Se t SENSITIVITY and SWEEPTIMEasdesired.2 Set TRIGGER SOURCE-SLOPE fo r internal orexternal triggering as required.3 Se t LEVEL to proper t rigger ing point Donot use AUTO or FREE RUN see Paragraph3-12 . Se t NORMAL SINGLE to SINGLE ARMED

indicator should glow5 Apply vertical signal.6 Apply trigger signal required i.e. usingexternal trigger; otherwise sweep will trigger

internally from vertical circuits . To re-arm sweep, switch to NORM L and

back to SINGLE ARMED lndicator wIDglow when sweep ls armed and ready to betriggered.

Figure 3-6. Single Sweep Operation

4

6

Section mFigure 3-6

3-9

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Beetion mFigure 8 7Mode11SOC

.._r1

-@

1. Disconnect grounding l n from center inputterminal.

2. Connect poSitive going Signal to left handterminal.3. Connect negative going Signal to center termi-nal.4. Se t SENSITIVITY tor des ired ver tica l defiec-tion. When using high sensitivities i.e.

toward 0.2 MY/CM and internal DC couplingcheck to r DC BALANCE Figure 3-3 Unecessary.

5. Bet VERNIER to CALforeallbratedSen8itivity.

6. Follow t he p roc edur e above U d1tferentialoorizontal iDpUt is desired.

Figure 3 7. Differential Operation3 10 01879-1

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Model 130C

01879 1

1 Connect Y signal to vertical inputConnect X signal to horizontal input

3 Set SENSITIVITY for desired deflection

4 Set VERNIER to CAL for calibrated sensitivity5 Adjust POSITION for desired verticalposition

6 Set SENSITIVITY for desired deflection7 Set VERNIER to CAL for calibrated sensi-tivity8 Adjust POSITION for desired horizontal posi-tion

Figure 3 8 X Y Operation

SW

Section IIIFigure 3 8

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Sectloo Vigure 4 1 Modell30C

TO CRTVERTICALDEFLECTIONPLATES

TO CRTHORIZONTALDEfLECTIONPLATES

TOCRTCATHOC - - - - - 1 CALIBRATOR~ O V

Figure 41 Model130C Overall Functional Block D1agra.m

4-0

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Modell30C

SECTION IVPRINCIPLES OF OPERATION

Section IVParagraphs 4-1 to 4-13

4 12 HIGH VOLTAGE POWER SUPPLY

Figure 4-2. LV Power Supply BlockDiagram

4-13. The high vol tage p:lwer supply provides thevoltages necessary for the operation of the cathoderay tube. Refer to Figure 4-3 for the following explanation. Tube v301 is operating in a Hartley oscillator circuit, oscillating at approximately 70 kc.The oscillator voltage is aPPlied to the primary ofhigh voltage transformer T30l. The primary vOltageis stepped up by the transformer and rectified byV304 and V305. The outp.ttoftherectifiers is filteredand applied to the CRT cathode and grid. The CRTcathode voltage is compared to the +250V supply byvoltage dividers R311 through R318 and. applied toControl Amplifier V302. Stnce the cathode of v302 is

4 1 INTRODUCTION4-2. As shown in the block diagram. Figure 4-1, theModel 130C consistsof five major sections: lowvollagep:lwer supply. high voit age p:lwer supply, verticalampWier, horizontal amplifier and sweep generator.4-3. The paragraphs of this section diSCUSll thecircuit details of the major secllonsoftheModel 130C.Since the vertical and horizontal ampl1flersare nearlyidentical. the horizontal amplifier is described where differs from the vertical amplifier.4 4 LOW VOLTAGE POWER SUPPLY.4-5. The low voltagep:lwer supply providesoperatingvoltages fo r t he amplifiers andfor the sweep generatorcircuits with outp. tts of -100V, +12.5V, +100V. and+250V. The regulated +12.5 volt suPPlY provides filament voltagefor the vertical and horizontal inp.tt stagesand a current source for the trace alignment coli.4-6. -100 VOLT SUPPLY.4- 7. The -100 vol t supply provides regulatedvoltagesfor the ampUller and sweep circuits, and also providesa reference voltage for the +100 volt and +250 voltsuppUes. Refer to Figure 4-2. DifferentlalAmplifierQ463/Q464 compares the reference voltage fromReference Tube V461 against theoutputvoltage sampleobtained by voltage divider R467/R469. The difference voltage is amplified and appUed to Driver Q462and Series Regulator Q461. The voltage applied toSeries Regulator Q461 is ou t of phase, i.e., when theoutp.tt voltage of the supply rises, the voltage appliedto Q461 causes the series voltage drop to increase,returning the supply vol tage to it s original level. Inthis way, any variations in output voltage due to loadchange or Une voltage change are sensed by the differential amplifier and corrected by the series regulator.Potentiometer R468 adjus ts t he output voltage toexactly -100 volts.4-8. +100 and +250 VOLT SUPPLIES.4-9. The +100 and +250 volt suppUes operate in thesame manner as the -100 volt supply. A sample ofthe output voltage is compared to a reference voltagethe -100 volt supply andthedifterencevoltageamplifled and. applied to a series regulator. Tbe seriesregulator corrects for the variations illoutp.tt voltage.The +250 volt is stacked on the +lOOV supply andthe two are interdependent.4-10. +12.5 VOLT SUPPLY.4-11. The +12.5 volt supply is dependent only on the-lOOV supply and uses a single series regulator Q481with a Zener diode reference CR482. Any variationin supply voltage is coupled through the referencediode. This results lnabasecurrentchange for Q481,which is amplified and. acts to vary th e supply loadcurrent. providing the supply regulation.

JRECTIfiER DIIVEI A.PUfIER.m omfiLTER l (RIESRECULATOI0421

J DRIVEl AIlPUflElI IECTlflElI 0442 0443flLTEI L. SOlESRECUlATORq441

SERIESc- REGULATORO4tlT

DIIYER DlffEflEinU IIPllflEllRECTIfiER 0462 OU3,G464flUEI T RHUEItE

W t

I 3 0 - 1 -

+250V

+10010

IOOV

01879-1 4-1

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Section IVParagraphs to 4-18 Mod.ell3OC

Figure 4-3. HV Power Supply Block Diagram

4 15 swnp GENERATOR416. Refer to Figure 4-4 for a block diagram of thesweep generator circuitry. The trigger generatorproduces sl.gnals which synchronize the sweep withinternal signals from the vertical ampUfter or powerline or With external trigger s1gnal . In Figure 4- 4circuits represented In bloclta to the r igh tof the Trigger Generator produce a linear sweep voltage saw.tooth wave shape) which is amplified by thehorlzontalarnpwter and applied to the CRT deflection plates.41 7. TRIGGER GENERATOR.418. The trigger generator consists ofd1Uerentialamplifier VIOl and Schmitt trigger V102. Thetrlgger

tied to a regulated VOltage .100 volts) any variationin b1gh voltage is seen by V302 as a change in grldeatbode voltage. Th1.s grid-cathode voltage change faamplifled and applied to the screen grid ofOscWatorV301 to control theoutputampUb.lde of the osc1llator.The change 1s always in the proper direction to correct for change in high voltage.4-14. INTENSITY control R308 varies the CRT cath-ode voltage, varying the inten.sity of the spot or traceon the CRT screen. FOCUS control R31'7 varies thefocus grid voltage r trace focus. Astigmatismadjustment R319 varies the voltage on the acceleratorto adjust beam geometry for a round sp>t.

GENERATOR

zsov2S vI JI UFIli 0 nOl -

\ /IOOV +IOOV IFOCUS) 0 ..IINTNSIn IQ, . - --

Kenna ,OSCllUTDI Tlusr.un lUO utI tECTlflEl Y D5I UNBLANKINGGATE FROM'JOC-.-. - SWEEP

SWEEP,.J--0 GENER TOfl GENERATOR DIODE I lIOiAlIOI liD lIOlA. VIDS III TIMINGk C P CITORHOLD OFF ~ 8lDClDUTCATHODE 1 1 SlEEPFOLLDIER OUTPUTlI03B , Co\ lODE

5104 FOLUlIERD VI 6BDIODE INORMAL-ICLAMP SINGLElI09BHOIHFFDIODE : lJOl:_c.,z HHOLD OFF lIDBCC P CITOR , I- ,

INTTRFRVER

EXTRIGGER1NPV1

4-2 018'7 -1

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Model13OC

signal, whether power line, internal, or external, isapplied to one grid of VIOl as determined by settingof the trigger slope control (S101). The other grid 1connected to LEVEL control R1l6 through 5101. Thesetting of Rl16 determines the DC level on one ha Uof VIOl, and tlJ.1s the point at which the trigger signalwill cause VIOl to conduct The outp.Jt of VIOIBdrives t rigger generator VI02 wbich provides thewaveform to drive the gate generator. When 5102 1in FREE RUN no trigger 18 needed to switch the gategenerator to start a new sweep; se e Paragraph 4--26.When 5102 is in AUTO, trigger generator Vl02 1converted to a free-nmning mJ.1tivibrator (R124 1placed in circuit by Sl02C), with a repetition rate of4 to 5 cps. Switch section S102B grounds one gridof VIOl (depending on slope selected by 5101) an dAC-couples the trigger signal through Cll3 toVI02A.This arrangement allows the trigger to be generatedat the approximate zero crossing of the inp.1t Signal.4-19. GATE GENERATOR.4-20. The quare wavegenerated by V102 is differentiated by C1l5 an d RlSO, and the positive spike isclipped by CRlll . Gate Generator Vl03A and Vl04Boperates as a Schmitt Trigger c ircuit with widehysteresis limits. The negative spike, through C1l6to the grid of VI03A, causes the gate generator tochange states, s tar ting the sweep. As the gate generator switches states, the posit ive ootput at Vl03Aplate goes to cathode J:lllower VlO4A which providesthe unblanldng Signal to the CRT (through theHV }X wersupply).4-21. INTEGRATOR.4-22. As the gate generator changes states on Signalfrom the trigger generator , the negative gate voltageat VI04B takes diodes VI09A and VI09B out of conduction. This allows the timing capacitor (C175

~ r o u C18l, depending on sweep time set to chargem a negative direction, since it is connected throughthe sweep time resistors to-lOOvolts. The integratorVl06A amplifies and Inverts this negative-going voltage at its grid (pin 2 to prod.lce a large, positivegoing OUtplt at the plate. Th1.8 positive-going voltageis fed. back to VI06A grid through cathode followerVI06B and t he t iming capacitor and this feedbackkeeps the integrator inp.1t voltage almost constant.Thus the voltage across the sweep timing resistoralso remalns nearly constant to prodUce a corresponding nearly constant current The current chargesthe sweep capacitor at a linear rate to produce alinear sweep outp.1t. The sweep output is routedthrough switch 5202 to the horizontal amplWer andthen to the CRT deflection plates.4-23. The slope of the sweep outp.1t waveforms isdetermined. by the RC time constan t o f resistors(R175 to R186) and capacitors (C175 to C18 ) used ona selected SWEEP TIME range. VERNIER controlRl79 provides a fine adjustment of sweep time byaltering the DC vol tage to which the timing resistoris returned. . Neon lamp Vl07 is used to reduce th eaverage level of the sawtooth swing to a less positivevalue the lower end of the sweep may be clampedto zero volts.01879-2

section IVParagraphs 4-19 to 4--274-24. SWEEP TERMINATION AND HOLD-OFF.4-25. Termination of a sweep is accomplished byfeeding back the positive-going sweep voltage to theinput of the gate generator. The feedback path isthrough hold-off diode VlOOC (which conducts duringthe sweep) and hold-off cathode follower v l03B. Thefeedback voltage on VI03B grid causes the cathodevoltage to cross the upper hysteresis limit of the gategenerator. The time requlred fo r this feedback toreach the upper hysteres1.8 limit is determined by thesawtooth slope, twa setting the time between sweeps.The gate generator changes state to produce a negative voltage s tep a t the plate of Vl03A and a positivevoltage step at the plate of VI04B. The negative voltage step is fed through gate outpJt cathode followerVlOtA to the higb-voltage power supply. blanking theCRT beam unW a new sweep begins. The positivevoltage step at the plateofVI04B causes diodes Vl09Aand VI09B to conduct The sweep t m ng capacitordischarges quickly through the clamp diode VI09B,clamping the sweep outpJ.t to a const ant level andprocl1cing the retrace portion of the sweep waveform.The two diodes return the sweep outp.1t to th e samereference level as the gridofintegratorVI06A. Hold-off dJode VlO9C 8 cut aU by the fast negative drop ofthe retrace i.e., as tlming capacitor discharges , ro tinstead of a rapid decrease in voltage at the grid ofVI03B, the voltage here starts decaying at a ratedetermined by RI48 and the valueofhold-offcapacitorused on a given sweep range. The catoode of Vl03Bfollows this decay rate and VI03A grid VQltageis kepthigh enough fo r a sufficient time to allowsweep circuitrecovery. When the hold-aU level fromVl03Bdecaysenough, a negat ive trigger at V103A grid can reachthe lower hysteresis limit and begina new sweep cycle.Stability adjustment, R15l, sets the DC level tustabove lower hysteresis limit at which VI03B cathodequits following the hold-aU decay voltage on the gridthis circuit is changed in free run operation; se eParagraph 4-26). An incoming trigger which reachesbelow this DC level to the lower hysteresis limit,starts the new sweep.

NoteThe hold-off capacitor for agivensweeptimesetting is the same capacitor which is used.as the timing capacitor in another sweeprange (except that stray capacitance is usedfo r hold-off p.1rposes in the three fastestsweep speeds). Fb r example, C176 is th ehold-off capacitor in 0.1 through 5 SECOND/CM set tings, but then C176 becomes thet iming capac itor in 10, 20, and 50 MILLISECONDS/CM settings (and Cl77 becomesthe hold-off capacitor .

4-26. FREE RUN CIRCUIT OPERATION.4- 27. When LEVEL control is se t to FREE RUN thegate generator and other sweep circuits operate..rlthou t a trigger from VI02. This 1 accomplished byallowing the hold-off decay at VIOSB cathode to crossthe lower hys te re si s l im it r at he r than a triggercrossing as explained in Paragraph 4-24) of the gategenerator which initiates a new sweep cycle. ThestabUity adjustment switched out of the clrcuit byS102E which applies -100 volts directly to Rl52tn the

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Sectton IVParagraphs 4-28 to 4-38cathode circuit of Vl03B. Tbl.e shifts the DC levelat which VlOOB cathode quits following the grid boldott voltage to a level below the lower hysteresislimit. Now as t he bold -oU decay wlt age c rossesthe hysteresis l1.m1t i t starts th e sweep again4-28. SINGLE SWEEP CIRCUIT.4-29. In single sweep operation the sweep istriggeredon the f irst trigger received after mamla] arming,and fUrther triggers are ineffective until the circuitis re-armed. Th1B sequence is accomplished in theModell3OC by preventing the retracefromoccurrlng.In NORMAL operation, switch SiMA reb.lrna QlOlemitter to ground through R150 and the transistor isinoperative. In SINGLE operation. however, Sl04Aconnects R150 to -100 volts . This st il l biases Q101off, bu t allows conduction when the base voltage be comes more posi tive during the sweep. In the SINGLEposition, 8lO4B connects +lOOv to neon indicatorDS10I. Because the sweep level 18 at zero volts be-fore the sweep waveform begtn.a, there is auUicientvoltage across the neon to CauBe it to light ARMED .ABsuming that SlO4 baa lUst been switched to SINGLEposition. the first trigger to arrive at the gate generator st rta a sweep in the usual way. the sweepoutput vol tage mes, the voltage across DSlOl decreases unW the Ught goes out. The positive-goingsweep wltage is also applied by voltage divider Rl43an d Rl44 to the base of Q10l, br1ng1ng the transistorinto conduction an d eventually driving i t into saturation. As in NORMAL operation. the sweep voltage isfed back through the bold-ott circuit to s. i teh th e gategenerator back to its pre-sweep condition V103A on,V104B off . With VlO4B cutoU, th e saturation currentof QlOl flowing through R13? is Iltill enough to keep

Modell3OC

diodes Vl09A an d Vl09B btaBed off. IntegratorVl06Ata tbuB allowed to contlroe integratingWlW i t reachessaturation. The sweep output waveform rounds an dlevels u remainIng at thiB b1gb positive level untilthe circuit is maml3Uy re-armed. Since th positivewlt age i s fed back through the hold-oU circult to theinp.1t of the gate generator , triggers generated byVl02 are unable to overcome this wltage an d operatethe gate. To re-arm the c ircu lt . SlO4 a switchedback to NORMAL. This cuts Q10l. which allowsV109A and Vl09B to conduct an d return the integratorto it s pre-sweep condition. Setting switch SlO4 backto SINGLE will repeat the s ingle sweep operation.

4 30 VERTICAL AMPLIf iER4-31. The vert ical amplWer, as shown in the blockdiagram of Figure 4-5, consists of three baBtc sectiona: 1 input atterwators, (2) differential feedbackampliller. and (3) output differential amplifier. Thesecircuits are explained in detai l in Paragraphs 4-32,4-34, and 4-36.4-32. INPUT ATTENUATOR4-33. The tnp.1t atteoo.ator consists of two identicalfrequency-compensated voltage dividers which pro-vide a constant inp.1t impedance of 1 megohm slwntedby 45 plon al l rangesofSENsrnvtTYfor both + andinp.1ts. Switch S2 selects either capacitive AC ordirect DC coupling from the 1npJt terminals to t heattenuator. Capacitors C2l and C22 areusedto adjustinput capacitance to 45 pf on SENSITIVITY ranges0.2 MILLIVOLTS/eM to 0.2 VOLTs/eM. A division

T

TALIONS

ALIONS

o ,I SENSITIVITY I,..---I II IJ DIffERENTIAL I ~ T P U T OUTPUFEED CK I DlfF RENTIAL TOAMPLIFIER AMPlIFIER VERTICi I DEFLECT

V I ~ O I 3 , V A PLATEII II o I POSITION JIVERNIER I Q \ ,\ ,\ ,,

I M : C ~ ~ E A I - \ lmESOOR

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Model13OC

ratio of 100:1 on the three least sensitive ranges(5 VOLTS/CM to 20 VOLTS/CM is provided byRll/R13 and Rl2/R14 on the two inPlts. Capacitors and C12 maintain the ratio at high frequenciesby capacitive division. Capacitors C13 and C14 areadjusted fo r 45 pi input capacitance on the three leastsensitive ranges. A division ratio of 10;1 on the nextthree ranges 0.5 VOLTS/CM to 2 VOLTS/CM Isprovided by R15/R17 and R16/R18 on the two inputs.Capacitors C17 and C18 maintain tb s ratio at highfrequencies and C19 and C20 are adjUSted to keepinput capacttance at 45 pI on these three ranges. Inthe CAL. posit ion of th e SENSITIVITY switch, inputtermJnals are opened and a 5 mlllivolt, :t3%, 350 cp ssquare wave is applied to the input of tube VIA tocheck amplifier calibration. Sensitivity of the ampl1tier in the CAL. JX sttion ts 1 mv/cm. In B L JX sttion, the inp.lt terminals are opened and the gridcircui ts of VI are grounded to allow accurate balancing of DC voltages in the amplifier.

4-34. DIFFERENTIAL FEEDBACK AMPLIFIER.4-35. From the input attel l. lator, a signal is fed tothe inp.lt of th e differential feedback ampli.f1er, i.e.grids of VI. Resistors R41 and R42 provide inp.ltoverload protection. The gain of this amplifierconsisting of VI, and Q1 through Q4 effectivelycontrolled by the interstage attenuator which insertsfeedback resistance determined by Sl setting be tween the emi tt er s o f Q3 an d Q4 . Gain proportional to th e ratio of the th1rd-stage (Q3 and Q4 collector load to feedback resLstance. The interstageattenuator al1d th e inp.lt attenuator g ive the overallcontrol of deflection sensitivity. ThemainDCcurrentpath for both VI andVernierBaladjUSbnentts throughthe feedback paths, R49-R50 or R48, to the -100 voltsupply at the collectors of Q3 and Q4 . The JX sitivevoltage supply with high value resistors comparedto feedback res is tance used for Vernier Bal, minimizes the effect of balance adjus tments on gain.Vernier Bal is adjusted to offset any unbalance at th eoutPJt stage plates resulting from the change tn resistance between t he cathodes o f V2A and V2B whenVERNIER is rotated out of CAL position. DC BALANCE, R49, and Coarse DC Bal, R48, adjustmentsar e used to equalize the voltage on e ithe r s id e of thefeedback resistance. When the voltages arebalanced,the feedback resistors have no DC flowing throughthem and thus changing their values ha s no effect onamplifier balance. Variable resistor R59 sets Q3/Q4collector voltages fo r anaverageof-15 volts, ensuringlinear operation of the output differential amplifier.The AMPLIFIER AC-DC switch allows capacitivecoupling o f the interstage attenuator on th e seven mostsensitive ranges, m1ntmtzlng the e e t of dc drift bypreventing DC current w in the feedback resistors.The result is the same as iftheampl1.fler is balanced.Gain adjustment R69 functions in the same manner asVERNIER control R lO, by inserting resistance whichacts as degenerative feedback. TbJs the gain may becontrolled in order to bring the sensitivity calibrationinto agreement with a voltage standardortoset intermediate sensitivities. The output of the differentialfeedback amplifier at Q3 and Q4 collectors drives theoutPJt differential amplUier, V2A and V2B.01879-2

Section IVParagraphS 4-34 to 404-36. OUTPUT AMPLlFlER.4-37. The outpJt d1tferential amplifier, V2A andV2B, provides the voltage swing necessary to drivethe deflection plates of theCRT. Cross-neutraltz:attonof th e outp.Jt stages is accomplished by adjustablecapacitors C48 and C49 stw.nted by C53 . whichcouple in-phase signals from the plates of the tubesto the opposite grids. A voltage divider conaistingof R75 and R77 in the plate circuit of V2A dividesthe outp.Jt signal. fo r use as an internal synchronizingsignal for the sweep generator. Constant currentsourc e v3 is an active impedance, functioning as ahigh common cathode impedance to ach1eve highdtHerential gain without the use of a large cathoderesistor and negative supply. Resistor R83 sets thebias on V3, hence the current totheoutpllt differentialamplifier. The setting of R83 interacts with R59.There are two front panel variable controls in theoutp.d amplUier: SENSITIVITY VERNIER and POSITION. When rotated ccw VERNIER, R70, decreasesthe gain i.e. rewces sensitivity of the amplifier byintroducing degeneration in the cathodes of V2. Vertical movement of the trace is accomplished by POSI-TION, R78, which feeds back diHerential currentsthrough R73 and R74. This results in a dtHerentialchange in Q3 and Q4 collector currents and a different1& voltage change at the grids of V2. ResistorsR79 and R80 ensure that regardless of the POSITIONsetting, no DC voltage change occurs at the catb:xtesof V2 as VERNIER is moved. Ttms, pQsition of thetrace is not affected by changes in the SENSITIVITYVERNIER.4-38. BEAM FINDER switch 54 inserts R85 in thecathode of V3, redJcing the current available to theoutpJt stage. This redJces the voltage swing of V2and reduces the CRT defiection plate VOltage swing,which brings the trace on screen regardless of signalamplitude.

4-39. HORiZONT L MPLIfiER4-40. The horizontal amplifier circuit operation isidentical to that of the vertical amplifier except forthe internal sweep positions of the SENSITIVITYswitch, and the POSmON control R22lA/B. In thenITERNAL SWEEP positions, Xl through X50, thesawtooth vol tage outpJ t f rom the sweep generator iscoupled into the amplifier inp.lt at V201A. The sweepsignal gain 18 then controlled by the tnterstageattenuator s ee F1gure 5-16 and applied to the CRT deflection plates. To allow viewing of any portion of anexpanded. waveform, a greater r ange for POSITIONcontrol is obtained b y va ry in g the D level at theamplifier inPJt where the sweep is awUed. For internal sweep, R221B is switched out of the circuitand replaced by two fixed resistors, R273 and R274;VERNIER R264 is also sho rt ed out leaving V202cathodes tied together. Resistor R22lA and it svoltage divider circuit becomes thePOSITION controland changes the DC level at which the sweep waveform is applied to the amplilier. Then as amplif1ergatn is increased by the interstage attenuator sectionof S202, the sweep 18 expanded and the effectivepositioning range is increased at the same time.

4-5

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Section VParagraphs 5- 9 to 5-13c. Ad ju st Vertical VERNIER fo r e xa ct ly 10 cmdeflection.d. Disconnect Voltmeter Calibrator and apply sig-nal from 500 MV CALIBRATOR to vertical input.e Deflection should be between 9 8 and 10 2 cmf. Di sc on nec t the calibrator signal

5 9 VERTICAL CALIBRATOR.a. Set: Vertical SENSITIVITY 1 MV/CMVoltmeter Calibrator output . 5 mv p pb. Adjust vertical VERNIER fo r exactly 4 cmdeflection.c Set vertical SENSITIVITY to CAL.d. The deflection should be between 3 88 and4 12 cme . Di sc on ne ct the Voltmeter Calibrator

5-10. VERTICAL BANDWIDTH.a Set: Vertical SENSITIVITY . . . . 1 MV /CMVertical VERNIER CALb. Connect the Oscillator to the vertical input.

NoteExternal attenuation of the Oscillator signalis required fo r this check. Use a r f Model350D A tt en ua to r Set or l oa d t he Oscillatoro ut pu t with a 5 ohm resistor

c. Set Oscillator f re qu en cy to 5 kc.d. Adjus t Oscillator amplitude for 10 cm deflection.e C on ne ct t he AC Voltmeter in parallel with thevertical input.f. Note reading of AC Voltmeterg. Ch ang e Oscillator f re qu en cy to 5 00 kc . R ea dj us tamplitude for AC Voltmeter reading noted in step fnecessaryh. The deflection shou ld b e 7. 1 cm or greater

D is co nn ec t t he Oscillator and AC Voltmeter5-11. VERTICAL COMMON MODE REJECTION.

a. Set: Vertical SENSITIVITY . 0 2 VOLTS/CMVertical VERNIER . . . . . . . . . CALb. Di sc on ne ct the g ro un din g l in k from the centervertical input terminalc . C on ne ct t he Oscillatorbetween the center termi-nal and the ground terminal

5- 2

Model 130C

d. Connect a short jumper between the left handterminal a nd t he g ro un d terminale. Set Oscillator frequency to 5 kc.f. Adjust Oscillator amplitude fo r 10 cm deflection.g. Short center and left hand terminals with t hejumperh. Set vertical SENSITIVITY to 2 MV /CM. The deflection should be 1 cm or lessj. Set vertical SENSITIVITY to 1 VOLTS/CM.k. Re co nn ec t jumper between left hand terminaland ground terminalm. Adjust Oscillator amplitude fo r 10 cm deflection;n. Short center and left hand terminals with t hejumperp. Set vertical SENSITIVITY to O 5 VOLTS/CM.q. The deflection should be 0 6 cm or lessr Reconnect jumper between left-hand terminaland ground terminals Set vertical SENSITIVITY to 1 0 VOLTS/CM.t. AdjustOscilloscope amplitude for 5cm deflection.u. Short center a nd l ef t- ha nd terminals with thejumperv. Set vertical SENSITIVITY to 5 VOLTS/CM.w The deflection should be O 3 cm or lessx. D is co nn ec t t h e Oscillator Reconnect the grounding link.

5-12. HORIZONTAL SENSITIVITY.a. Apply a 1 volt p p signal from the Voltmeter

Calibrator to the horizontal input.b. Set: Horizontal INPUT . . . . . . . . DCHorizontal SENSITIVITY O 1 VOLTS/CMHorizontal VERNIER CALc. Horizontal deflection should be between 9 7 and10 3 cmd. Check al l other SENSITIVITY ranges in the samemanner as above u si ng t he v al ue s shown in Table5 2 The deflection i n e ac h case should be between

9 7 and 10. 3 cm5-13. HORIZONTAL CALIBRATOR.

a Set: Horizontal SENSITIVITY . 1 MV /CMVoltmeter Calibrator output 5 mv p pb. Ad ju st horizontal VERNIER fo r e xa ct ly 4 cmdeflection.c Set horizontal SENSITIVITY to CAL.d. The d ef le ct io n s ho ul d be between 3. 88 and4 12 cme . D is co nn ec t the Voltmeter Calibrator

01879-3

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Model 130C

5-14. HORIZONTAL BANDWIDTH.a. Set: Horizontal SENSITIVITY 1 MV/CM

Horizontal VERNIER CALb. Connect the Oscil lator to the horizontal input.

NoteExternal attenuation of the Oscillator signalis required fo r this check. Use a Model350D Attenuator Set or l oad the Oscillatoroutput with a 50 ohm resistor.

c. Set Oscillator frequency to 5 kc.d. Adjust Oscillator amplitude fo r 10 cm deflection.e. Connect the AC Voltmeter in parallel with thehorizontal input.f. Note reading of AC Voltmeter.g. Change Oscillator frequency to 500 kc. Readjust ampli tude for AC Voltmeter reading noted instep f if necessary.h. The deflection should be 7.1 cm or greater.1. Disconnect the Oscillator and AC Voltmeter.

5-15. HORIZONTAL COMMON MODE REJECTION.a. Set: Horizontal SENSITIVITY 0.2 VOLTS/CMHorizontal VERNIER CALb. Disconnect the grounding link from the centerhorizontal input terminal.c. Connect the Oscillator between the center terminal and the ground terminal.d. Connect a short jumper between the lef t-handterminal and the ground terminal.e. Set Oscillator frequency to 50 kc.f. Adjust Oscillator amplitude fo r 10 cm deflection.g. Short center and lef t-hand terminals with thejumper.h. Set horizontal SENSITIVITY to 20 MV/CM.1. The deflection should be 1 cm or less.j. Set horizontal SENSITIVITY to 1 VOLTS/CM.k. Reconnect jumper between left-hand terminaland ground terminal.m. Adjust Oscillator amplitude for 10 cm deflection.n. Short center and left-hand terminals with thejumper.p. Set horizontal SENSITIVITY to 0.5 VOLTS/CM.q. The deflection should be 0.6 cm or less.r. Reconnect jumper between left-hand terminaland ground terminal.s. Set horizontal SENSITIVITY to 10 VOLTS/CM.t. Adjust Oscillator amplitude fo r 5 cm deflection.u. Short center and lef t-hand terminals with thejumper.v. Set horizontal SENSITIVITY to 5 VOLTS/CM.

01879-1

Section VParagraphs 5-14 to 5-17w. The deflection should be 0.3 cm or less.x. Disconnect the Oscillator.

5-16. PHASE SHIFT.a. Set: Horizontal and Vertical SENSITIVITY . . . 10 VOLTS/CM

Horizontal and Vertical VERNIER CALHorizonta l and Vertical AMPLIFIER DCHorizontal and Vertical INPUT DCb. Connect the Oscillator to both horizontal andvertical input terminals.c. Set Oscillator frequency to 100 kc.d. Adjust Oscillator amplitude fo r 5 cm ver tica land horizontal deflection.e. The minor diameter of the ellipse should beless than 0.1 cm.f. Check al l other SENSITIVITY ranges, keepingdeflection constant at 5 cm. The minor diameter of

the ell ipse should be less than 0.1 cm in each case.Note

On the highest SENSITIVITY ranges, externalattenuation of the Oscillator signal will benecessary. Use a Model 350D AttenuatorSet or load the Oscillator output with a 50ohm resistor.g. Disconnect the Oscillator.

5-17. TRIGGERING.a. Set: Vertical SENSITIVITY . 20 VOLTS/CMHorizontal SENSITIVITY . INTERNAL SWEEP XlSWEEP TIME 1 MlLLISECONDS/CMTRIGGER SOURCE-SLOPE . EXTLEVEL . AUTOb. A baseline should be displayed with no signalapplied.c. Apply a 500 kc signal from the Oscillator tothe vertical input.d. Set: TRIGGER SOURCE-SLOPE . INTSWEEP TIME 1 /LSECONDS/CMe. Adjust Oscillator amplitudefor 0.5 cmdeflection.f. Vary Oscillator frequency from 500 kc to 50cps, keeping amplitude constant at 0.5 cm. Stabletriggering shOUld occur over the entire range.g. Set LEVEL to .h. Vary Oscillator frequency from 10 cps to 500 kc,keeping amplitude constant at 0.5 cm. Stable triggering should occur over the entire range. Note:some adjustment of LEVEL may be necessa ry atthe high frequency end of the range .1. Apply a 500 kc signal from the Oscillator tothe vertical input and the external trigger input.

5-3

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Section VParagraphs 5-18 to 5-22 Model 130C

j. Set: LEVEL . . AUTOExternal trigger input DCTRIGGER SOURCE-SLOPE . EXTVertical SENSITIVITY 1 VOLTS/CMVertical VERNIER CALSWEEP T M l/lSECONDS/CM

k. Vary Oscillator frequency from 500 kc to 50 cps,keeping amplitude constant at 0.5 cm. S table triggering should occur over the entire range.m. Set TRIGGER LEVEL to n Vary Oscillator frequency from 5 cps to 500 kckeeping deflection constant at 0.5 cm. Stable triggering should occur over the entire range.p. Set external trigger input to ACq. Vary Oscillator frequency from 500 kc to 20 cps,keeping ampli tude constan t a 0.5 p-p . Stable triggering should occur over the entire range.r. Disconnect the Oscillator.

Observe a power-line frequency waveform. Thedisplay should be synchronized.5-18. TRIGGER POINT AND SLOPE.a. Apply a 100 cps signal from the Oscillator toboth the vertical input and the external trigger input.b. Set: Vertical SENSITIVITY . 2 VOLTS/CMTRIGGER SOURCE-SLOPE . . . INTLEVEL AUTOSWEEP TIME 2 MILLISECONDS/CMc. Adjust Oscillator amplitude fo r 10 cm deflection.d. The sweep should trigger on the positive-goingpart of the waveform.e. Check INT-, EXT and EXT- posit ions. Thesweep should trigger on the proper slope for eachposition.f Vary LEVEL throughout it s range. The startingpoint of the sweep should vary along al l points on the10 cm waveform.

5-19. SWEEP CALIBRATION.a. Set: Vertical SENSITIVITY 2 VOLTS/CMHorizontal SENSITIVITYINTERNAL SWEEP XlTRIGGER SOURCE-SLOPE INTLEVEL SWEEP TIME . . 1 /lSECONDS/CM

SWEEP VERNIER CALb. Apply the output of the Time Mark Generator toth e vertical input. Set the output of the T ime MarkGenerator to 1 microsecond.c. Adjus t horizontal POSITION so that the firstmarker coincides with the lef t graticule edge.d. The 11th marker or the 21st marker shouldoccur within 0 .3 cm of the right graticule edge.e. Check al l th e remaining SWEEP TIME ranges,using the values shown in Table 5-3.f Disconnect the Time Mark Generator.

10 VOLTS/CM CAL

s. Set: TRIGGER SOURCE-SLOPELEVEL LINEAUTO

5-21. SWEEP MAGNIFlER.a. Set: SWEEP TIME 1 MILLISECONDS/CMSWEEP VERNIER CALHorizontal SENSITIVITY . . . INTERNAL SWEEP X2TRIGGER SOURCE-SLOPE . INTLEVEL .b. Apply a signal from the Time Mark Generatorto the vertical input. Se t the output of the TimeMark Generator to 1 millisecond.c. Adjust horizontal POSITION so that the firstmarker coincides with the left graticule edge. The

fifth marker should occur within 0.5 cm of the r ighthand graticule edge.d. Check t he r ema in ing magnif ie r r anges, usingthe values shown in Tab le 5-4. The fifth eleventhor the 21st marker should occur within 0.5 cm ofthe r ight hand graticule edge.

5-22. INTENSITY MODULATION.a. Set: Vertical SENSITIVITYVertical VERNIER Horizontal SENSITIVITY INTERNAL SWEEP XlSWEEP TIME 10/lSECONDS/CM

Table 5-3. Sweep CalibrationTime Mark SWEEP TIME Time MarkGenerator Setting /10 cm1 lse 1 /lSECONDS/CM 101 lse 2 /lSECONDS/CM 205 lse 5 /lSECONDS/CM 10

lse 10 /lSECONDS/CM 10 lse 20 /lSECONDS/CM 205 lse 50 /lSECONDS/CM 10

lse . 1 MILLISECONDS/CM 10 lse .2 MILLISECONDS/CM 205 lse . 5 MILLISECONDS/CM 101 msec 1 MILLISECONDS/CM 101 msec 2 MILLISECONDS/CM 205 msec 5 MILLISECONDS/CM 1010 msec 10 MILLISECONDS/CM 1010 msec 20 MILLISECONDS/CM 2050 msec 50 MILLISECONDS/CM 10100 msec .1 SECONDS/CM 10100 msec .2 SECONDS/CM 20500 msec .5 SECONDS/CM 101 se c 1 SECONDS/CM 201 se c 2 SECONDS/CM 205 se c 5 SECONDS/CM 10

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Model 130C

Table 5-4. Sweep Magnifier Calibration Sweep Time at 1 msec/cm)

Time Mark Time Marks/Generator Output Magnifier 10 cm1 msec X2 5100 jJ.sec X5 20100 jJ.sec X10 100 jJ.sec X20 5 X50 20

b. Apply a 100 kc signal from the Oscillator tothe vertical i npu t. A dj us t Oscillator amplitude fo r2 cm deflection.c. Remove grounding link from Z AXIS INPUT rear panel) and connect s ignal f rom Oscillator to

Z AXIS INPUT.d. At normal intensity, the top of the sine waveshould be extinguished.5-23, SINGLE SWEEP.

a. Set: SWEEP TIME. 10 MILLISECONDS/CMNORMAL-SINGLE NORMALLEVEL b. S wit ch from NORMAL to SINGLE. The ARMEDlight should come on.c. Set LEVEL to AUTO. A single sweep shouldoccur, and the ARMED l ight should go out.

5 24 TROUBLESHOOTING5- 2 5. T he following paragraphs outline proceduresfo r Ibcating and eliminating malfunctions. Be surethat the trouble cannot be eliminated making anadjustment, but do not make arbitrary adjustmentsettings; always follow the procedures given inParagraph 5-58. To locate assemblies and othercircuit components refer to Figure 5 -1 and 5-2; alsorefer to Paragraph 5-87. Schematic diagrams foral l circuits are shown in Figures 5-7, 5 -1 1, 5 -1 3,5-16, 5-18, and 5-20.

5 26 ISOLATING TROU LES TO MAJORSECTION5-27. The following checks should be performedwhenever a malfunction is suspected.5-28. POWER SUPPLIES.

a. Set: Vertical and Horizontal SENSITIVITY 2 VOLTS/CMVertical and Horizontal VERNIER CAL

b. Depress BEAM FINDER. A defocused spotshould appear on the screen if the power suppliesare operating properly.01879-1

S ec ti on VParagraph 5 -2 3 to 5 -3 65-29. AMPLIFIERS.

a. Set: Vertical and Horizontal SENSITIVITY CALVertical and Horizontal AMPLIFIER AC

b. A trace tilted at and having 5 cm verticaland horizontal deflection should appear i f t he amplif ie rs a re operating properly.5-30. SWEEP GENERATOR.

a. Set: Horizontal SENSITIVITY INTERNAL SWEEP XlLEVEL. AUTOTRIGGER SOURCE-SLOPE INT+SWEEP TIME 1 MILLISECONDS/CMVERNIER CALVertical SENSITIVITY CAL

b. A synchronized square wave, 5 cm in amplitude,should be observed if th e sweepgenerator is operatingproperly.Note

the horizontal amplifier is not operatingproperly, the sweep operation will also beaffected.5 31 LOW VOLTAGE POWER SUPPLY

TROUBLESHOOTING5-32. The two co mmo n troubles in t he low vo lt ag esupplies are loss of regulation and excessive ripple.The follOWing paragraphs outline procedures forisolating faulty components.5-33. EXCESSIVE RIPPLE.5-34. Excessive ripple in any of the supplies mayusually be traced to two sources: defective filtercapacitors or defective transistors. The ripple atthe output of each supply and at the input to eachregulator is given in Table 5-5. the ripple at theoutput of any of th e supplies is excessive, check the-100 volt supply first. it s output is normal, thencheck the ripple at the regulator input of the supplyin question. the ripple of the unregulated supplyis excessive, check the filter capacitors and therectifier diodes. the ripple of th e unregulatedsupply is normal, check for defective transistors inthe amplifier series and regulator stages.5-35. LOSS OF REGULATION.5-36. The failure of any of the supplies is usuallydue to transistor fai lu re . Tab le 5-6 provides a systematic procedure for troubleshooting each of the

Table 5-5. Ripple MeasurementsUnregulated OutputSupply Ripple Ripple

-100 7 v p-p 4 mv p-p+ 12.5 v p- p 5 mv p-p+ 100 v p-p 4 mvp-p+250 5 v p- p 7 mv p-p

5-5

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Section VFigure 5-1 Model 13 C

H V POWER SUP PL Y -T----;:======;------,.--FiF=Pi-T-------i 1 / A301 0=::::0FUSE 2A

HIGH VO LTA GE AD J R312~ ~ I N T E N S I T Y LIMITr R307~ ~ I G M A T I S M

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13 C 8

Figure 5 1 Model 13 C Top View Cover Removed

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Model 130C Section VFigure 5 2

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LOW VOLTAGEPOWER SUPPLYA401 .. .H ...

R447 1 J ?R468 -100.-. . iAi i Id >6 -.::: /~ ~ ~ ~R 4 0 2CALIBRATOR

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Figure 5 2 Model 130C Bottom View Cover Removed

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Section VTable 5 6Table 5 6. Low Voltage Supply Troubleshooting

Model 130C

Supply Symptom Procedure Result Conclusion100V High Output Disconnect base lead of Q461 WHT/ Output remains high Q461 shortedGRN/VIO lead connecting to edge ofboard near top of instrument . Output drops Q461 good

Reconnect base lead. Short emitter Output remains high Q462 shortedto collector of Q464 Output drops Q464 open or Q463Measure voltage across R465 Same as output Q463 shorted

Less than output Q464 openLow Output Measure voltage across CR462 o volts CR462 shorted

o volts CR462 goodShort collector to emitter of Q462 Output remains low Q461 open

Output rises Q461 goodShort collector to emitter of Q463 Output remains low Q462 open

Output rises Q463 open orQ464 shorted 100V High or Short emitter to base of Q464 Output remains low Q464 shortedLow Output Output rises Q463 open

Check output of 100 supply Either abnormal 100 and/orand/or 12.5 supply 12.5 supplyoth normal 100 supply

High Output Disconnec t base lead of Q441 WHT/ Output remains high Q441 shortedRED/GRN lead connecting to edge ofboard near rear of instrument . Output drops Q441 goodShort emitter to collector of Q443 Output remains high Q442 open

Output drops Q443 openLow Output Short emitter to base of Q442 Output rises Q443 shorted

Output remains low Q442 shorted orQ4410penMeasure voltage between emitter and o volts Q442 shortedcollector of Q442 greater than 2 vol ts Q441 open

250V High or Check 100 and 100 supplies Normal 25 supplyLow Output Abnormal 100 or 100suppliesHigh Output Disconnect base lead of Q421 GRN Output remains high Q421 shortedlead connecting to edge of boardnear back of instrument Output drops Q421 good

Short emitter to base of Q422 Output remains high Q422 shortedOutput drops Q423 shorted

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Model 130C

Table 5-6. Low Voltage Supply Troubleshooting Cont d)

Section VParagraphs 5 -37 to 5- 52

Supply Symptom Procedure Result ConclusionLow Output Measure voltage across CR422 o Volts CR422 shorted

6 volts CR422 goodShort emitter to collector of Q422 Output remains low Q4210pen

Output rises Q422 or Q423 openShort emitter to collector of Q423 Output rises Q423 open

Output remains low Q422 openlow voltage power supplies. The transistors associated with the low voltage supplies are located on thelow voltage power supply circuit board and at therear of the instrument. Fo r the location of the circuitboard, refer to Figure 5-1.5-37. Resistors R421, R441, R461, a nd R481 protectthe series regulator transistors in eachofthe supplies. the output of one of t he supplies is accidentallyshorted, the resistor in series with the series regulator will dissipate excessive power a nd f ai l. C he ckeach of the series resistors located near the filtercapacitors; note silkscreen identifiers when a malfunction of the low v ol ta ge supplies is suspected.5 38 HIGH VOLTAGE POWER SUPPLY

TROUBLESHOOTING5-39. Wav ef or ms and DC voltages which will aid introubleshooting ar e shown on the schematic diagram.5-40. Troubles in the high voltage power supply canbest be iso la ted by DC voltage measurements. Anydecrease i n the regulat ed high voltage is amplifiedand inverted by V302 a nd a pp li ed to V301. The screenv ol ta ge o f V301 controls the amplitude of the oscillator output, and thus the high voltage.5 41 AMPLIFIER TROUBLESHOOTING5 -4 2. Sin ce the vertical and horizontal amplifiersare nearly i de nt ic al ; a single troubleshooting procedure may be used f or b ot h amplifiers.5-43. UNBALANCE.5-44. the trace cannot be brought on screen withthe DC BALANCE control, try adjusting R48 in thevertical amplifier or R234 in the horizontal amplifier. the trace is still off-screen, use the followingprocedure to localize the unbalance.

a. Set POSITION to mi dr an ge .b. Short grids of output tubes together V2 invertical, V202 in horizontal).c. If trace remains off-screen, trouble is in outputstage. trace returns, proceed to step dd Turn the instrument off.e. Switch AMPLIFIER to DC.

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f C on ne ct g ro un d lead of ohmmeter to chassis.g. Compare resistance readings at correspondingpoints in both halves of the amplifier. Unsymmetricalreadings will indicate a source of unbalance.h resistance readings do n ot p oi nt o ut the sourceof the unbalance, proceed to step 11 Turn instrument on, switch A MPLI FI ER toAC and se t SENSITIVITY to BAL position.j. Measure DC voltages at corresponding pointsin b ot h h al ve s o f the amplifier.k. SWitch AMPLIFIER to DC.m. Repeat voltage measurements made in step jCompare readings made in steps j and m wit h v ol ta ge sshown on schematics. Any significant deviation Shouldindicate location of the trouble.

5-45. GAIN5-46. the gain o f the ampl if ie r cannot be set properly with Gain adjustment R69 in vert, R263 i nhoriz. , try the n ex t h ig he r sensitivity range. If thegain cannot be se t on this range, changeV2 in verticalamplifier or V202 in horizontal amplifier, and checkthe high voltage output ref. Paragraph 5-67).5-47. LOW-FREQUENCY NOISE.5-48. low-frequency noise is visible on t he trace,tr y changing the i np ut t ub e VI i nvert, V201 in horiz.). this does not cure the trOUble, change the secondstage transistors Ql, 2 in vert. Q201, 202 in horiz.).5-49. COMPRESSION.5-50. the signal waveform is compressed inamplit ud e when the trace is moved to the top or bottom ofthe screen , check that the output stage current isadjusted properly ref. Paragraph 5-74), t he n trychanging the output tube.

5 51 SW GENERATORTROUBLESHOOTING

5-52. the horizon ta l ampli fier is not operatingproperly , the sweep operation not sweep cirCUit) wilalso be affected. a sweep malfunction is observed,first check the horizontal amplifier. the horizontal5-9

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Section VParagraphs 5-53 to 5-59amplifier is operating properly check typical waveforms shown i n F igure 5-8 located near schematicproceed to the steps below.

a. Set LEVEL to FREE RUN. the sweepoperates,check V101, V102, and CRlll. the sweep doesnot operate, proceed to step b.b. Check DC voltage in each of the states shownin Table 5-7 . A 10 to 15 deviation from the valuesshown in the t abl e c an be expected; larger deviationsindicate a source of trouble.

5 53 REP IR AND REPLACEMENT5-54. Circuit boards used in the Model 130C havecomponents on one side of the board and a platedconductive metal layer through component holes.When removing or replacing etched circuit componentsthe important steps and considerations are I; ServiceNote M-20D also contains useful informationon etchedcircuit repair :

a. Use a low heat 37 to 47.5 watts , less than 800 Fidling temperature , slightly bend chisel tip 1/16 to1/8 inch diameter soldering iron, and a small diameter, high tin content solder. a ros in solder isused, clean the area thoroughly after soldering.

b. Components may be removed by placing thesoldering iron on the component lead on either side ofthe board, and pulling up on the lead. heat is appliedto the component side of the board, greater care isrequired to avoid damage to the component especiallytrue for diodes). heat damage may occur, grip thelead with a pair of pliers to prov ide a heat sink be tween the soldering iron and component.c. a component is obviously damaged or faulty,clip the leads close to the componentand then unsolderthe leads from the board.

Table 5-7. Sweep Generator TroubleshootingTest SweepPoint Completed* Reset**

V103 Pin 2 -100 volts ovoltsPin 6 92 volts 48 voltsPin 7 -44 volts -1 vol ts

V104 Pin 7 -45 volts -57 voltsPin 6 -4.9 volts -2.4 volts

V106 Pin 2 4.7 volts -.15 voltsPin 6 195 volts 2. 3 voltsPin 8 195 volts 16 voltsPin 9 195 volts 2. 3 volts

V109 Pin 8 -9.5 volts -74 voltsPin 9 -9.6 volts -74 volts

*Sweep Completed: Connect Pin 2 of V103to -100 volts VIO wire).**Reset: Connect Pin 2 of V103 to ground.

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Model 130C

d. Large components such as potentiometers andtube sockets may be removed by rotating the solderingiron from lead to lead and applying steady pressureto lift the part free the alternative is to clip theleads of a damaged part .e. Since the conductor part of the etched circuitboard is a metal plated surface, covered with solder,use care to avoid overheating and lifting the conductor

from the board . A conductor may be cemented backin place with a quick-drying acetate base cement usesparingly haVing good insulating properties. -other method for repair is to solder a section of goodconducting wire along the damaged area.f. Clear the solder from the circuit board holebefore inser ting a new component lead. Heat thesolder in the hole, remove t he iron, and quicklyinsert a pointed non-metallic object, such as atoothpick.g. Shape the new component leads and clip toproper length. Insert the l eads in the holes and applyheat and solder, preferably on the conductor s ide.

5-55. Most of the wire leads to the etched circuitboards have edge-on connector s. When removingor replacing these connectors, be sure they areproperly aligned with the guide slot in the board edge.Applying force with the connector mis-aligned willspring the contacts and result in a faulty electricalconnection.5 56 CATHODE RAY TUBE REPL CEMENT5-57. To replace the cathode ray tube, us e thefollowing procedure:

WARNINGSerious injury may result if the cathode raytube is dropped. Handle the tube careful ly .

a. Remove the beze l.b. Loosen the clamp at the CRT socket.c. Remove the tube socket from the clamp. t maybe necessary to carefully loosen socket from clampwith a narrow-blade screwdriver.d. Slide the tube out of the instrument.e. Install the new CRT, reversing previous steps.Note: over-tightening the clamp at the CRT socketmay damage the tube.f. Check alignment of trace with graticule. trace is misaligned, bring into alignment with R329,TRACE ALIGN rear panel).g. Check Astigmatism ref. Paragraph 5-68).h. Check Intens ity Limit ref. Paragraph 5-69).1. Check Vertical Gain ref. Paragraph 5-75).j. Check Hor izontal Gain ref . Paragraph 5-75).

5 58 ADJUSTMENTS5-59. The adjustment procedures are divided intothree groups. Group I adjustments includeproceduresof Paragraphs 5-64 through 5-69; these proceduresset the power supply outputs and optimize front panel

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controls for CRT display. Group II adjustments arein the procedures of Paragraphs 5-70 through 5-80;these procedures are for adjustments which are madeth e same way in both vertical and horizontal circuits.Group III adjustments are in the procedures of Paragraphs 5-81 through 5-86; these procedures adjustthe calibrator output and the sweep generator circuit,and depend on an accurate calibration of the verticaland horizontal c ir cuits . Re fer to Figures 5-1 and5-2 to locate adjustable components . Always makethe preliminary sett ings of Paragraph 5-62 beforefollowing any adjustment paragraph procedure.5-60. REQUIRED TEST EQUIPMENT.5-61. Refer to Table 5-1 for information on instruments required for t he adjustment procedures. Substitu te instruments should have the characteristicsdescribed in the table.5-62. PRELIMINARY SETTINGS.5-63. The following settings must be made prior tofollowing any adjustment paragraph procedure. asetting is different f rom these preliminary settings,the procedure fo r the adjustment will specify so.

LEVEL AUTOTRIGGER SOURCE-SLOPE INTALL VERNIERS . . . . . . . . . . . . . . . CALALL AC-DC . . . . . . . . . . . . . . . . . ACGrounding links . . . . . . . . . . . . . connectedNORMAL-SINGLE NORMAL5 64 GROUP ADJUSTMENTS5-65. LOW VOLTAGE POWER SUPPLY.5 -66. Use a DC Voltmeter to measure the output, withrespect to chassis ground, of the low voltage powersupplies and make adjustment or check tolerance asShown in Table 5-8. Thevoltagemeasurement can bemade at any wire coded with the colors specified inTable 5-8.5-67. HIGH VOLTAGE POWER SUPPLY.

a. Connec t the Model 11044A 100:1 Voltage Dividerto the DC probe of the Model 410B Voltmeter.b. Set Voltmeter to 3-volt-DC range, and polarityto -.c. Set the Voltmeter Calibrator for -300 vol ts DCoutput, and connect divider t ip to the output.d Set the gain adjustment of the Model 410B(located at the rear of the instrument) for a readingof exactly 3 volts.e. Set the Vol tmeter to the 30-volt range, andmeasure the high vol tage supply output at pin 8 oftransformer T401.Table 5-8. Low Voltage Power Supply AdjustmentSupply Tolerance Wire Color Adjustment-100V Violet R468 100V White/Red R477 250V 2507V Red none 12.5V 12.5lV White/Bl