DEPARTMENT OF THE ARMY TECHNICAL MANUAL~ ~; ~'n~~ HEADQUAR ]'ERS, DEPARTMENT OF THE ARMYJANUARY 1959This manual is correct to5 Janua1'Y 1959TM9":"9505-2-35TECHNICAL MANUAL}No. 9-9505-2-35HEADQUARTERS,DEPARTMENTOFTHEARMYWASHINGTON 25, D. C., 26 January 1959ORDNANCEMAINTENANCE:MEGACYCLE METER8898466CHAPTER 1. INTRODUCTIONSection I. General _II. General description of grid dip meteL .III. Data _CHAPTER 2. THEORYOFOPERATION _3. PARTS, SPECIALTOOLS, ANDEQUIPMENTFORFIELDANDDEPOTMAINTENANCE.CHAPTER 4. INSPECTIONSection I. General _II. Inspection of grid dip meteL .CHAPTER 5. TROUBLESHOOTING _6. GENERALMAINTENANCE _CHAPTER 7. FIELDMAINTENANCESectionI. General _II. Fieldmaintenanceprocedures _CHAPTER 8. DEPOTI MAINTENANCESectionI. General _II. Rebuildandrewiring _CHAPTER 9. FINALINSPECTIONANDREPAIRSTANDARDS _ApPENDIX REFERENCES -------- _INDEX _AGO3863AParagraphs Page1-4 25,6 47,8 59-11 612-15 1116-19 1420,21 1522-25 1626-29 2330-33 2434-43 2944-46 3147-50 3151-54 383941CHAPTER 1INTRODUCTIONSection I. GENERAL1. Scopea. This manual is publishedfor the use ofpersonnel responsiblefor fieldanddepot main-tenance of megacycle meter 8898466, herein-afterreferredtoas the griddipmeter (fig. 1).This manual does not contain informationwhichisintendedprimarilyfor the usingor-ganization, sincesuchinformationis availableto ordnance maintenance personnel in the perti-nentoperatortechnical manual.b. This manual contains description andtheoryofoperationofthegriddipmeter. Ital.sodescribes troubleshootingprocedures, dis-assembly, repair, andassembly instructions forthe grid dip meter. The instructions inthismanual areintendedfor maintenancespecial-ists whohavebeen trainedinelectronicsmain-tenance practices and have had previous ex-perienceinperformance testingandalinementandadjustmentproceduresonsimilartypesofequipment.c. The appendix contains a list of currentreferences, includingsupply manuals, technicalmanuals, and other available publications ap-plicabletothegriddipmeter.d. Operation, lubrication, and all mainte-nance operations allocated to usingorganiza-tions inperformingmaintenancework withintheir scope for the grid dip meter are containedin thepertinent operationmanuals forthesys-temwith which the grid dip meter is used.Refer totheappendix.e. Errors or omissions in this manual willbebrought to the attention of the Commander,U. S. Army OrdnanceMissileCommand, ArmyRocket and Guided Missile Agency, RedstoneArsenal, Ala., ATTN: ORDXR-FMPT, usingDA Forni. 468 (Unsatisfactory EquipmentReport) .22. Fieldand Depot MaintenanceAllocationTherepair andrebuildinstructions for thegriddipmeterhavebeendividedintoseparatefield maintenance and depot maintenancechapters. In general, field maintenance respon-sibilities prescribed in this manual aredirectedbythe allocation of maintenance parts listedintheapplicablesectionof Department oftheArmySupplyManual ORD8SNLJ-739andtoolslisted inType4 SNL J-29. Depot main-tenanceprescribedinchapter 8coversrebuildandrewiringof thegriddipmeter. Instruc-tionsfor depot maintenancearetobeusedbymaintenancecompanies inthefield onlywhenthe tactical situation makes the repairfunctionimperative. Provisions of parts listedin thedepotstockguidecolumn oftheapplicablesec-tion of ORD8 SNL J-739will be made tofieldmaintenance personnel only when the emer-gency nature of the maintenance to be per-formedhasbeencertifiedbyaresponsibleoffi-cer of therequisitioningorganization.3. Forms, Records, and Reportsa. Generat. Responsibility for the properexecutionof forms, records, andreports restsupon the commanding officers of all units main-tainingthis equipment. However, the valueof accurate records must befully appreciatedby all persons responsible for their compilation,maintenance, and use. Records, reports, andauthorizedformsarenormallyutilizedtoindi-catethe type, quantity, and conditionof ma-teriel tobeinspected, toberepaired, or tobeusedinrepair. Properlyexecutedforms con-veyauthorizationandserveasrecordsfor re-pair or replacement of materiel in the hands ofusingpersonnel and for delivery of materielrequiringfurther repair toordnanceshops inarsenals, depots, etc. Theforms, records, andreportsestablishtheworkrequired, theprog-AGO386M1RAPD406360Figure 1. lv]egaeye1e meter(g ripclip meter) 8898466.ress of the work within the shops, and thestatus of the materiel upon completion of itsrepaIr.b. AuthorizedPOI'ms. The forms generallyapplicable to units maintaining this materielarelistedintheappendix. For acurrent andcompletelistingof allforms, refer toDAPam310-2. For instructions on the use of theseforms, refer to FM9-10. Additional formsapplicable to the usingpersonnel are listed intheoperator'smanual.AGO:186:1Ac. Field Report of Accidents. The reportsnecessaryto complywiththe requirements ofthe Armysafetyprogramareprescribedinde-tail-inAR385-40. Thesereportsarerequiredwhenever accidents involving injury to per-sonnel or damage to materiel occur.d. Report of Unsatisfactory Equipment 01'Materials. Any deficiencies detected in theequipmentcoveredinthismanual, whichoccurunder thecircumstances indicatedin AR700-38, should be immediatelyreported in accord-3+WIRES CROSSING~ FIXED RESISTOR00PLUG AND(NOCONNECTION)JACK+POTENTIOMETER(OCTAL)+WIRES CROSSING(ARROWALWAYS DENOTES(CONNECTION)CLOCKWISE ROTATlON)-0-AC OUTLET0FRONT PANEL CONTROL(MALE)4:-GROUND CONNECTION (KNOB)OR RETURNCAPACITOR$GAS TUBE0-0J(FEED THROUGH)--0-*INDICATESTYPE OF METEREXAMPLE:lJA - MICROAMMETER#VARIABLE CAPACITORWTRIODE TUBE--PANEL INDICATINGLAMP-if-FIXED CAPACITORSINGLE COIL CHOKEW(MAGNETIC CORE)DUODIODE TUBE~ ...SPST TOGGLE SWITCH]llltIRON CORE TRANSFORMER(CENTER TAPPED)o ~ ~WAFER SWITCH0*'NDICATESTYPE OF* APPARATUS REPRESENTED~BY BLOCKc ~o------v IPHONE JACKRAPD236BB6~ RECEPTACLEFigure2. Schematic symbols.ancewiththeinstructions inthecitedregula-tion.4. Symbolsand Reference DesignationsA knowledge of schematic symbols, test pointsymbols, functional symbols, and referencedesignationsisessentialfor thefull utilizationof diagrams and illustrations inthis manual.a. Schematic Symbols. So far as is prac-ticable, standardelectriCal andelectronicsym-bols are used to represent electrical and elec-tronic elements as designated on a schematicdiagram. Figure2showsthesymbolsusedinthe schematic diagrams contained in thismanual.Note. The standard practiceof usingthe Greek letterI" to indicate micro (one-millionth) is followed in thismanual.b. ReferenceDesignations. Referencedesig-nations arenot tobeconfusedwithschematicor test point symbols. Asystemof referencedesignations is used for identifying electricalorelectronic partsforassembliesorsubassem-blies. Referencedesignations are combinationsof letters and numbers and are used in thedrawings, diagrams, parts lists, and text of thismanual. The reference letters indicate thetype of part, such as resistor,amplifier, electrontube, etc. Thereferencenumber identifiestheparticular part. If, forexample, fiveresistors,either identical ordifferent, areusedinanin-strument, each is given a different number.The reference designation thus identifies andlocates the part.Section II. GENERAL DESCRIPTION OF GRID DIP METER5. Descriptiona. The grid dipmeter is a general purposehigh-frequencymeasuring device. It consistsof two units, an oscillator unit and a power4supplyunit. Theoscillatorunitmaybeeitherahighfrequency (2.2to400megacycles) unitor anultrahighfrequency (430to940mega-cycles) unit. Either oscillator unit may beusedwiththepower supplyunit.AGO3863Ab. The HF oscillator unit consists of avariablefrequencyoscillator whichcanalsobeoperated asadiodedetectorandishousedinaround metal case. One of seven plug-in coilsis attached to the HF oscillator unit duringoperation to provide the desired frequencyrange. The oscillator coils are stored in therearofthepower supplyunit whennot inuse(fig. 1). The uhf oscillator unit (fig. 1) ishoused in an octagonal metal case anduses onlyone oscillator coil permanently affixed to theunit. The oscillator and power supply unitsare interconnected by- a short, flexible cable.The pow.er supply unit contains a regulatedpowersupply, ammetercircuit, andasourceofmodulation for the oscillator.c. Byfollowingspecial operatingproceduresset forthinTM9-9505-1-30andTM9-9505-1-45, the grid dip meter can be used withappropriate charts to calculate capacitance,inductance, mutual inductance, andQ factor.d. The griddipmeterissuppliedasaninde-pendent itemof test equipment, and is alsosupplied as a part of the following Type 4electronicshopsets:Truck-Mounted Electronic Shop AN/MPM-38Truck-Mounted Guided Missile Test Sta-tion AN/MSM-12 (with uhf'oscillatorunit)Semitrailer-Mounted Electronic ShopsAN/MSM-21andAN/MSM-26Semitrailer-Mounted Electronic ShopsAN/MSM-23 and AN/MSM-246. Differences Between ModelsTwomodels of thegriddipmeter arebeingprocured, onewiththeHFoscillator unit andonewiththeuhfoscillator unit. Thedescrip-tion and instructions in this manual apply tobothmodels. Futuremodifications, if any, willbe coveredbyDAMWO's. Refer tothe cur-rent DAPam310-4 for any applicable DAMWO'spublishedsubsequent to the printing ofthismanual.Section III. DATATableII. ElectronicDataFrequencyrange 2.2mc to 400 mcFrequency stability 2%from2.2to400mc(940 mc withuhf oscil-lator unit).Frequencyranges (insteps) __2.2to5mc5 to10 mc10 to22 mc22 to45 mc45to100mc100to250mc200to400 mc430 to 940 mc (uhfoscillator unit).Supply voltage 117volts ac, 50/60cyclesPowerconsumption 20 wattsModulation:InternaL 120cpsExternaL 20-volt rms for 30%mod-ulation.TableIII. TubeComplement7. Physical DataThe grid dip meter is manufactured byMeasurements Corporation of Boonton, N. J.,andisidentifiedby themanufacturerasmodel59 or model 59UHF. The pertinent physicaldatais containedintableI (par. 8).8. Electronic DataThe electronicdata is containedintable II.Thetubecomplement iscontainedintableIII.TableI. Physical DataUncrated CratedCharacter-isticsOscillatorIPower supplysection sectionBothsectionsI--Height------------6lh inches 9inchesWidth------------5lhinches 8inchesLength 2inches 7%inches 13inchesDiameter 3%inches------------ -----------Weight 1lb. 6lhlbs. 11lbs.Volume 89cubic 234cubic1936cubicinches. inches. inches.AGO3863AVIV2V3Tube Type5Y3WGTOD3/VR150955FunctionRectifierShunt regulatorHigh frequency oscillator5CHAPTER2THEORY OF OPERATIONB.B+WAVE METERCIRCUITUNDER TESTRA PD238614Figure 3. Absorption frequencymeter.A10. FunctionalDescription of MajorComponentsa. Theblockdiagram(fig. 4) illustratesthesimplicity of the grid dip meter. The griddipmeter consistsof a power supplyunit andanoscillator unit. Themeter usedtoindicategridcurrent is mounted onthe power supplyunit case.b. The power supply (fig. 20) consists of apower transformer, a full-wave rectifier, api-typefilter, andagas-tubevoltageregulator.The high-voltage output of the power trans-former is rectifiedbytubeVI. Theoutput oftube VIis filteredbyapi-type filter, consistingquency. Thelossofenergy fromtheoscillatorcauses the feedback to decrease, and this inturnproducesadecreaseingridcurrent.9. Measurement Problema. Electronicequipment usingresonancecir-cuits requiresameans of measuring frequency.Thesimplest frequencymeasuring deviceis theabsorptionfrequencymeter (absorptionwave-meter) . A, figure 3, i1lustrates a typical ab-sorptionwavemeter coupledto a tankcircuit.The milliammeter in the plate circuit of theunit undertest servesastheindicatingdevice.With the absorption frequency meter looselycoupledtoinductor L, theplatecurrent ofthetype in the unit under test increases slightlyastheabsorptionwavemeter istunedthroughthefreqeuncyofthecircuitundertest.b. Theelementary absorptionwavemeter re-quires close couplingto the oscillating circuittoproducea platecurrent changesufficient togivevisual indicationonthemilliammeter. Amore sensitive absorption wavemeter is ob-tainedbyaddinga rectifier anda dcmeter totheelementarycircuitasshowninB, figure 3.c. Inbothoftheabsorptionwavemeters de-scribed, thecircuit under test must beoperat-ingwithnormal power applied. However, ifthewavemeter is connected as a self-poweredoscillator, measurementscanbemadewithnopower beingappliedtothe circuit under test.Infact, onlythosecomponentswhichmakeupthe tuned portion of the circuit are requiredto obtain a resonant measurement. When awavemeteris connectedasaself-poweredoscil-lator, it is commonlyreferredtoas agriddipmeter. Agriddipmeter is a simple vacuumtube oscillator to which a low-range milliam-meter or microammeter is added to measure theoscillator grid current. The grid dip meteris so called because the grid current will de-crease or "dip" as the oscillator is tunedthroughthefrequencyoftheunknowncircuit.The"dip" ingridcurrent isobservedbecausethecircuit undertestabsorbsenergyfromtheoscillatorwhen bothare tunedtothesamefre-6AGO3863Aa low-range meter (200 microamps) is usedthus realizing the full use of available gridcurrent swing. This bucking voltage is pro-vided by a meter bridge circuit. The meterbridge circuit is shown in simplified forminfigure5. Whenthegriddipmeterisoperatednormally, withvariableresistor R6at full cwposition, and a coil inserted inthe oscillator.section, but not tunedtoresonancewith an ex-ternal circuit, point Aof figure 5is at -1.8volts dc. This voltage is a direct result ofoscillator gridcurrentthroughpoint Ctotwoparallel paths, resistor R7 and meter M1 inseries, and variable resistor R6 to ground.Opposingthis current is a positive voltage atpoint B. 'b. Point B(fig. 5) is connected to+150 voltsdc through a270K resistor (R3) and to groundthroughvariable resistor R6 inparallel withseries-connected resistor R5 and meter M1.WhenR6is at full ccwposition, thevoltage atpoint B is+4.4voltsde. Variableresistor R6canbeadjustedtobalancethetwovoltagesatpoint C. When these voltages are exactlyequal, they cancel and the meter reads zero.When R6 is adjusted to cause the meter to indi-cate full scale, the negative voltage is thehigher voltage (greater grid current). Tuningthegriddipmeter (coupledtoanexternalcir-cuit) to a "griddip" will lower the value ofgridcurrent, thus loweringthegridvoltages.Thepositive ,voltageis derivedfromavoltageregulated source, sothat with R6 at a givenpoint, thevoltageat point Bis stable. Ifthevoltage atpoint Avaries, thecurrent throughthe A toCarmof the bridge will vary, andthemeter will followthis current change. Inthis caseasgridcurrent decreases, themeterreading decreases. The voltages at point Calways approach an equal but oppositevalue asthe meter. approaches a zero reading.' Whenthe griddip meter islooselycoupledto the cir-cuit under ~ e s t the change ingrid current isslight.. Theuseofa low-rangemicroammeterallows indication ofsIPaUgrid current changes.The meter circuit remains thesame in all threemodes of operationin which the griddipmeterisused.c. When the grid dip meter is operated in theDIODEposition, the gridandplateof tubeV3are connected together. Figure 6 shows theMETEROSCILLATOR~POWER SUPPLY lJARAPO236885Figure 4. Grid dip meter, block diagram.of reactor L1 and capacitors C1A andC1B and. 'apphed to the voltage regulator. Switch 82controls the mode of operation of the oscillator.Meter M1 indicates the gridcurrent of oscil-lator tubeV3.c. The oscillator circuit is a modified Colpittsoscillator. VariablecapacitorsC5andC6pro-vide a variable frequency output within therangesof thesevenplug-incoilsusedwith the- unit. Capacitors C3, C4, C5, C6, and one ofthe plug-in coils complete the tank circuit ofthe oscillatorunit. A low-range microammeterisconnectedinseries withthegridcircuit toprovide a visual indication of grid current.Variable resistor R6 on the power supplyaffectsthegridbiasoftheoscillatortube, andcontrols the bucking current to the meterbridgecircuit.d. The null or zero beat of the griddip metercanbe determinedbytwo means: a griddipmeterindication, oran audibleclick inah'ead-set. Whenusinga headset, themeter is i s ~connectedbyinsertionof theheadset pluginPHONESjack J2. Theheadset givesanaud-i ~ l e click, not a continuous tone, as the grid'dlP meter istunedthroughzerobeat.101. Detailed' Circuit Operation;(l.. Whentheoscillatorgridreturncircuit i ~coimected through a milliammeter to gro,uIld(usingPHONESjackJ2), the swingof gridcurrent isfrom1.7milliampereswithnoloadontheoscillatorto0.92milliampereswiththeoscillator at resonance with anexternal circuit.A metercapableofhandling thisrangeofcur-rent is not sensitive enough forpractical appli-cation. Throughtheuseofabuckingvoltage,AOO:38.63A7R156800R610K=I SENSITIVITY= P25 3 -J3-S2 (REF)11 2J2R86800I PHONES I RA PO 23a554Figure6. Diode position, simplified 8c1vematic.NOTES:1.SHADED PARTS SHOWN FOR REFERENCE ONLY2.VALUESIN OHMS, MICROMIC.ROFARADS, ANDHENRYS UNLESSOTHERWISE NOTED3.WAFERSWITCH SHOWN IN POSITION USED ONLYJl,selector switch82, and capacitor C8. Anexternal audio signal can be appliedto MODjackJ1tomodulatethegriddipmeter. Theinternal modulatingsource is disconnectedbythe insertionofaplug intoclosed-circuit :MODjack Jl.C RA PD 238634Figure5. Meter bridge circuit, partial schematic..simplified schematic with switch 82 in theDIODEposition. The circuit in thisconditionis thatof anabsorptionwavemeterwithdiodedetector and meter indicator as described inparagraph9b. Theexternal circuit undertestmust havepowerapplied.d. In the CW position(fig. 7) selector switch82connectstheplatecircuit oftubeV3totheB+supply. TubeV3nowfunctions asanrfoscillator, tunableover theranges selectedbythe plug-in coils. The resonant circuit to whichthegriddipmeter iscouplednowacts some-what like an absorption-type wavemeter in thatit absorbspower fromthegriddipmeter tankcircuit. As power is absorbedfromthe griddip meter, the plate-to-grid feedback is re-duced, and in turn the grid current is de-creased. When the grid dip meter and theexternal circuit are tuned to the same fre-quency, maximumpowertransfer occurs, andminimumgridcurrentisdrawnbytubeV3asindicatedonmeter Ml.e. Circuit operation of thegriddipmeterinthe MODposition (fig. 8) is identical withoperationintheCWposition, except that theoscillator is modulated by the 120 cps ripplevoltage of rectifier tubeVl. The ripple volt-age is appliedthrough capacitorC7,MOD jack+4.4VR6C410KJ550MAXBL2,L3R9L4,L5470L6,L7-V3L8 955J6 C350 R16 R106800 68008AGOll868AJ5C450R106800R1568003 P23 J3(REF)NOTES:1. VALUES IN OHMS, MICROMICROFARADS, ANDHENRYS UNLESSOTHERWISE NOTED2. WAFER SWITCH SHOWN IN POSITION USEDONLY3. SHADED PARTS SHOWN FOR REFERENCE ONLYRA PO 238600R72S21K12R610K "=R5~ N S T V T ~R333K270KFigure7. CW position, simplified schematic.L2, L3L4., L5L6, L7L8AGO3863A9R156800

J3S2(REF)R145600ISENSITIVITylR610KR533K,,=.: . .:,", I'."; C80.5JJFS2(REF) J2C4J550L2,L3rL4,L5L6,L7IV3L82 955LJ6R106800PHONESC70.5)JF. \ V1 5Y3WGTt ",\" .n\n'\\," ,\, \ \ ..'"stTt L1\' \ R13 4.5H R2 R3\ 1K 680 270K\\, ........"'\.\........ ...--J\A/"\r.....-_--I\ C1 ..LC2'"10 JJFT 10JJFT\ \......",,,........\ 5 6 2J 1[MODINOTES:1. VALUES IN OHMS, MICROMICROFARADS, ANDHENRYS UNLESS OTHERWISE NOTED2. SHADED PARTS SHOWN FOR REFERENCE ONLY3. WAFER SWITCH SHOWN IN POSITION USED ONLYRAPO 238599Figure 8. Modulated position, simplified schematic.10 CHAPTER3PARTS, SPECIAL TOOLS, ANDEQUIPMENT FOR FIELDANDDEPOTMAINTENANCE12. GeneralTools, equipment, andmaintenance parts aresupplied to ordnance direct support mainte-nance units and depots for maintaining andrepairingthemateriel coveredinthismanual.13. PartsDirect support maintenancepartsanddepotmaintenance parts are listed in appropriatecolumns of the applicable section of SupplyManual ORD8 SNLJ-739, which is the au-thority.for requestingreplacements. Chassis-mountedelectronicparts, and electronicpartsfor which the disassembly procedure is obvious,are identified inthis manual on photographicillustrations. Thesepartsareidentifiedontheillustrations by reference designations only.For full descriptions, values, andpartnumbersfortheseparts, refertothelegendtothesche-maticdiagrams (figs. 20 and 21). In each casewherean ordnance part number is not avail-able, the manufacturer's part number is used(par. 31c).14. Common Tools and EquipmentStandard and commonly used tools and equip-ment having general application to this ma-terielarelisted inType4 SNL J-29, section3,andareauthorizedfor issuebyTAandTOE.15. Special Equipmenta. The special equipment tabulated intableIVis listed in Type 4SNLJ-29, section 3.Thistabulationcontainsonly thespecialequip-ment necessaryto performthe operations de-scribedinthis manual. Itis includedfor in-formationonly,andisnot tobe usedasabasisforrequisitions.Note. 'Type 4 SNLJ-29, section 3, in addition tospecial equipment, alsocontainsstandardandcommonlyused tools and equipment specifically applicable to thismateriel.b. Adescription together with theory andmaintenance for the special equipment tabu-latedintableIVis containedinthefollowingtechnical manuals: electronic voltmeter ME-119/MPM-38 (8501933), TM 9-9508-4-35;frequency meter 8026531, TM9-9504-6; andmetercalibrator 8027828, TM 9'-9504-41.TableIV. Special Equip1nentPar.Item Electronic voltmeter(VTVM)IFrequencymeter (GertschModei FM-3) _Meter calibrator (Kay Lab Model M30B1Z) _AGO3863APart No.850193380265318027828, Fig. I

I10 15b11 15bUseACvoltage measurementDCvoltage measurementFrequency measurementVariabledcvoltage11RAPD236892Fig1l1'C.9, E/ectronicvoltmetel' ME-ll,qIMPM(VTFM),RAl'D236891Figllre10. FTequenc-y meter 8026581.12 .'.GO I ~ ~ A.. c.METER CALIBRATOR. A\ODF.L M$ol:HlFiglll'c iI, ]VIefel' (,r//ib'/'uto/' 8027828.0"RAPD23689413CHAPTER4INSPECTIONSection I. GENERAL16. ScopeThis chapter provides specific instructionsfor the technical inspection of the grid dipmeter by ordnance maintenance personnel.This chapteralsodefinesthein-processinspec-tionof materiel duringrepair or rebuild andthe final inspection after repair and rebuildhas been completed. Section II providesspecific instructions for the technical inspectionofthegriddipmeter. Troubleshootinginfor-mation is incorporated in chapter 5 andis anormal phase ofinspection.17. Purposes of InspectionInspection is primarily for the purpose ofdeterminingthe conditionof anitem, for ex-ample, serviceable or unserviceable; recogniz-ing conditions which would cause failure;assuring proper application of maintenancepolicies at prescribed levels; and determiningtheabilityofa unittoaccomplishits mainte-nance andsupply mission.18. Categories of Technical InspectionIn general, there are five categories of inspec-tionperformedbyordnance maintenance r ~sonnel.a. Overall Inspection. Thisisanoverall in-spection performedperiodicallyon allmateriel.It is also performed on materiel received forrepairinthefieldordepot maintenanceshops.Uponcompletionof aninspectionfor service-ability, materielwill bedeclaredeitherservice-able orunserviceable.b. PreembarkationInspection. Thisinspec-tionis performedonmateriel inthehands ofmaintenancepersonnel alertedforoversea dutyto insure, that such materiel will not becomeunserviceableorwornoutinarelativelyshorttime. It prescribes a higher percentage ofremaining usable lifeinserviceablemateriel tomeet a specificneedbeyondminimumservice-ability.c. In-process Inspection. Thisinspectionisperformed by the repair technician and/orfloor inspector inthe process of repairingorrebuilding the materiel and its components.It insures thatall partsconformtoprescribedstandards, thattheworkmanshipis inaccord-ance with approved methods and procedures,andthat deficienciesnot disclosedbythetech-nical inspectionarefoundandcorrected. De-tailedinstructions arecontainedinchapter 6.d. Final Inspection. This is an acceptanceinspection performed by a final inspector, afterrepairorrebuildhasbeencompleted, toinsurethat the materiel is acceptable according toestablished standards. Detailed instructionsarecontainedinchapter9.e. Spot-CheckInspection. Thisis anoverallinspection performed periodically on only apercentage of the materiel in each unit to deter-minetheadequacyandeffectivenessofpreven-tivemaintenance.19. Classification of MaterielAll ordnance materiel, after inspection, isclassified as follows:a. Serviceable. Serviceable property con-sists of all newor usedsupplies whichareincondition for issue for the purpose intendedand all supplies which can be placed in suchcondition throughpreissuetests or inspections,in storage deprocessing, installation of acces-sories, correction of minor deficiencies whichhave developed since the item was last classifiedasserviceable, applicationof modification workorders forwhichpartsareavailable, orassem-blyof available components.b. Unserviceable. Unserviceable propertyAGO3863AIII,consists of all supplies whicharenot service-able (i. e., does not satisfythe definitioninaabove). Thedefinitionof unserviceable prop-erty isfurther brokendownintothe followingsubclassifications: Property which is unservice-ablebut economicallyreparable, andpropertywhich is unserviceable and not economicallyreparable.Section II. INSPECTIONOF GRID DIP METER20. Inspection of the Mechanical Components oftheGridDipMetera.. The griddipmetermust becleanand dryinsideandout.b. Thepainted cases mustbeinagoodstateof preservation.c. The selector control, sensitivity control,and tuning control must be intact, and functionnormally without binding.d. The meter scale, frequency indicationscale, andallotheressential markingsmustbeclearly definedandeasilyread.e. The meter needle must not stickat anypoint.f. The meter and tuning control windowsmust notbecracked, scored, ordiscolored.AGO3863A21. Inspectionof Electrical Components oftheGridDipMetera. Check resistors for cracks, swelling, ordiscoloration.b. Check to see that the dual electrolyticcapacitor isnot leaking.c. Check power transformer and choke forindications of overheating, such as blisteredpaint, smoke, or leaking sealing compound;listenforhumwhichmightindicateloosecorelaminations.d. Checkthetubes toseethat theyarenotloose in their sockets, and that none of the keysarebroken.e. Check to see that the variable tuningcapacitor supportsarenot broken.15CHAPTER5TROUBLESHOOTING22. PurposeTroubleshooting is asystematic isolationandremedyof malfunctionsanddefectivecompon-ents bymeans of symptoms andtests. Closeadherence to the procedures covered herein willmaterially reduce the time required to locatetrouble and restore the equipment to normaloperation.23. ScopeThetests andremedies providedhereinaregoverned by the scope of level of ordnancemaintenance. The operational check andtroubleshootingtable (table V, par. 24) indi-cates the step-by-step procedure for locatingdefective components of the grid dip meter.In this table, normalindications are givenwith16the probable cause of malfunction. Methodsfor correcting the trouble are given, exceptwhenthemethodof correctioncanbeexpectedto be obvious to the trainedtechnician. Avolt-ageandresistancechart is showninfigure12andis usedas an aid introubleshootingpro-cedures.24. Operational CheckandTroubleshootingofGridDipMeterThe operational check and troubleshootingtestchart providesastep-by-stepprocedureofoperation necessary to determine what com-ponent ofthegriddipmeter isatfault. Theoperational check andtroubleshootingchartofthe power supply is contained in table V, test 1.Theoperational check andtroubleshootingfre-quency test areshown in tableV, tests2 and3.AGO 3E63A--------------+- --------e. >Q0Vl 0'"400 5Y3GT00240*0>'" >NC NCT1DVIeV2TUBE LAYOUTIN CHASSIS(UNDERSIDE)V2OD3/VR150NCNCoooo400240*300K+230V+230V300KNCPOWER SUPPLY CHASSISOSCILLATORRAPD 2369BOooo17K+150V290KoNCV1016AF4o50o17K+150V290KNCooaaV102OB2+150V290KNCNCNOTES,,. TUBESOCKETPOSITIONSAREASVIEWEDFROMUNDERSIDEOFCHASSIS. DC VOLTAGES ARE PRECEDED WITH A"+" OR "-"SIGNANDAPPEARABOVETHELINE. RESISTANCESARESHOWNBELOWTHE LINE. WHEN FOLLOWED BY K, THE VALUE IS INTHOUSANDSOFOHMS. WHENFOLLOWEDBYMEG, THEVALUEIS IN MILLIONS OF OHMS, WHEN NOTHING FOLLOWS, THEVALUE IS IN OHMS. AC VOLTAGES ARE SHOWN BELOW RE.SISTANCE MEASUREMENTS AND ARE DESIGNATED BY ANASTERISK (*J.2. DC VOLTAGE MEASUREMENTSTAKEN WITH ELECTRONICVOLTMETER.3. AC VOLTAGE MEASUREMENTSTAKEN WITH ELECTRONICVOLTMETER.4. ALL VOLTAGE AND RESISTANCE MEASUREMENTS ARE SUBJECTTO VARIATIONS DUE TO, ACCURACY OF METERS USED TOESTABLISHCHART DATA, ACCURACYOF METER USEDINTROUBLE SHOOTING, AND TOLERANCE OF CIRCUIT COMPONENTS.5. ALL MEASUREMENTS TO BE TAKEN WITH SELECTOR SWITCH INCWPOSITION.Figure12. VRchart.MULTIMETERTS-352B/U V2-5117VAC _VARIABLE GRID DIP+ +VTVMTRANSFORMER - METER2352086 POWER SUPPLY CHASSISGRD8501933- -BMULTIMETER VTVMTS-352B/U 8501933117V AC-+!CHASSIS GRDVARIABLE GRID DIP- -METERTRANSFORMER METERCALIBRATOR2352086 POWER SUPPLYV2-58027828++c-MULTIMETERTS- 352B/UHCHASSIS GRD117VAC_VARIABLEGRID DIPVTVMTRANSFORMER -METER85019332352086POWER SUPPLY V2-5tI18Figure 13. Power supply test equipment connections.RAPO236890AGO3863A>~o ~ . ~ . . _ Table V. Operational Check an,d Troubleshooting of Grid Dip Meter: Test No. 1. PowerSupply'">PRELIMINARYINSTRUCTIONS: Connect variabletransformer2352086andgripdipmeterpowersupply asshowninA, figure 13.Plugvariabletransformer into117vac outlet. Set variabletransformer at 117volts. Allowa 15 minute warmupperiodbeforecontinuingeachtest.StepControl settingsandoperationof test equipment Control settings and operationof unit Normalindication Possible cause of abnormal indicationMaximumof 15 millivolts________ CapacitorC1, C2, ortubeV2defec-tive.VTVMreadingvaries a maximum Resistor R2or R13, reactor L1, orof 5volts. tubeV2defective.Place selector switch,82toCW 150 volts dc 7volts____________ Power transformer T1 or tube V1Placeoff-onswitchSl toon. defective.1A1B1C1DConnect power supply test circuitas shown in figure13A.Set VTVMto300volt dcrange.Connect power supply regulationtest circuit as shown in figure13B.Set meter calibratorat 5voltslessthanthereadingobtainedundernormal indicationcolumnof steplA, beingsuretoobservepolari-ties as showninfigure 13B.SetVTVMto10volt dcrange.Vary the variable transformer from105 to129 volts.Connect power supply ripple testcircuit as showninfigure13C.Set VTVMto1 voltacrange.Placeselector switchS2toMOD__ 120cpstonsheardinphones _Connect phones to PHONES con-nector J2.Capacitor C7 or C8, connector J1or J2, switch S2, tube V1, orpower transformer T1 defective.Test No.2. Frequency Test (H-FOscillator Unit)PRELIMINARYINSTRUCTIONS: ConneCt the griddipmeterandthefrequencymeter to117voltsac. Allowa 15-minutewarmupperiod.Couple the coil used in the griddipmeter tothe antennaofthefrequencymeter. Theproper couplingcanbeob-tainedbyplacingthe oscillator sectionof thegriddip meter ontop of thefrequency meter with thecoil about fourinchesfromthe antenna. Thecouplingshouldnotbeanycloser thanneededtopreventpossibleerrors inreadings... Note. The frequency meter measures fundamental frequencies from20 to 40 me. All frquencies checked outside this rangemust bear a har-monicrelationship to the fundamentalfrequencyused. 0,Table V. Operational Check and Troubleshootingof Grid Dip Meter-ContinuedTest No.2Frequency Test (H-FOscillator Unit)-ContinuedStep-'control settingsandoperationof test equipment Control settingsandoperationof unit Normal indication Possiblecause ofabnormal indication2A2B2C2DSet frequencymeter to20mc _Refer to step 2A_' :.. _Refer to step 2A _Set frequencymeter to30 mc _Zerobeatat 2.5inc 2%indicated Oscillator stage V3 defective.on grid dip meter dial. Calibrationoutof adjustment (par.26), 2.2-5 mc coil defective.4.0 mc 2% Refer to step2A.5.0 mc 2%____________________ Refer to step2A.5.0 mc 2%____________________ 5.0-10mccoil defective.2E2F2GRefer to step 2D _Refer to step 2D _Refer to step 2D _7.5 mc10 mc10 mc2% _2% _2%------------------7-Refer to step2D.Refer to step2D.10-22 mc coil defective.2H2J2K2L2M2NRefer to step 2D _1:et frequencymeter to40mc _E'et frequencymeter to20mc _Setfrequencymeter to30mc _1:et frequencymeter to40mc _Set frequencymeter to 25mc _mcmcmcmcmcmc2% Refertostep2G.2% Refer to step2G.2% 22-45mccoil defective.2% Referto step2K.2%____________________ Refer to step2K.2%_____________________ 45-100mccoil defective.2P Refer to step2N________________2Q Refer to step2N________________2R Refer to step2N________________75 mc 2%____________________ Refer tostep2N.100me 2% .,-_____ Refer tostep2N.100mc 2% 100-250 mc coil defective.>l;'lo2S2T2U2V2WRefer to step 2N _Refer to step 2N _Setthefrequencymeter to40'mc__150mc 2%_____________________ Refer to step2R.250mc 2%____________________ Refer to step2R.the 200mc 2%______ 200...,.,.400 mc coil defective.--------------------------.......".. ~ ~Test No.3. Frequency Test (UHFOscillator Unit)PRELIMINARYINSTRUCTIONS: Connect the griddipmeterandthefrequencymeterto117voltsac. Allowa l5-minutewarmupperiod.Couple the coil used in the griddipmeter to the antennaof thefrequencymeter. Theproper couplingcanbe ob-tained by placed the oscillator sectionof thegriddipmeter ontopof thefrequencymeter withthecoil aboutfourinchesfromtheantenna. Thecouplingshouldnot beanycloser thanneededtoprevent possible errors in readings.Note. Thefrequency meter measures fundamental frequencies from20 to 40 mc. All frequencies checked outside this range must bearaharmonic relationshiptothefundamental frequencyused.Possible cause ofabnormal indicationOscillator stage VlOl defective.Calibrationout ofadjustment (par.26), R-F coupling coil defective.Referto step3A.Refer to step3A.Normal indication Control settingsandoperationof unitControl settingsandoperationof testequipmentISet frequencymeter to40mc_____ Set selector switch S2 to CW Zerobeat at 440mc2%indicatedSet griddip meter to440mc.____ on grid dip meter dial.Refer to step 3A________________ Set griddipmeterto680mc______ 680mc 20/0 . _Refer to step 3A________________ Setgriddipmeter to920mc 920 mc 20/0 _3A3B3C__~ _-----25. AlinementandCalibrationoftheGridDipMetera. HFOscillator Unit. Whenevertheoscil-lator tube (V3) becomes weak ordefective andisreplaced, recalibrationof thegriddipmeteris necessarybecauseof the difference in tubeinterelectrode capacitance. When: replacingthe dial cover leavethethree cover retainingscrewsslightlylooseso that it will bepossibletorotatethecover. Rotatethetuningcontrolknob as far as it will go clockwise. Loosenthethreedial coverretainingscrewsandturnthe dial cover so that the hairline is alinedwiththelongendmarkonthefrequencydial.Tighten one of the three cover retaining screwsfirmly. Place the 22 to45mc coilintothe griddip meter. Set control knobofgriddipmeterat 30 mc. Set frequency meter 8026531 (TableIV, par. 15) at 30mc. Couplegriddip metertotheantennaof the frequencymeter.Note. Refer to preliminary instructions of opera-tional check, Table V, (par. 24) Test 2.Rotatetuningcontrol knobof grid dipmeteruntil anull indication is heard. Loosen there-taining screw on the dial cover of the oscillatorsectionandrotatethecover until the hairlmeisalinedwiththe30mcgraduation. Tightenthe three retainingscrews firmly. Ifunable tocalibratebecausethecover will not rotatefarenough, loosenthethree screws retainingthedial, androtatethedial tocompensate.22b. UHF Oscillator Unit. When the oscillatortube (V101) intheoscillatorunit requiresre-placement, a slight adjustment maybe neces-sary. First, try several replacement tubes(type 6AF4) and select a tube to match theoriginal dial calibrationas nearlyas possible. IRemovethetuningknobandthe cover of theoscillatorunit as follows: removethescrewinthecupwasher at thecenter ofthecover andremovethescrewsontheright andleft edgesofthetopcover. (Donot disturbthescrewsabove the name "MEGACYCLE METER".)Liftthecoveroff. Alsoremovethesidecoverby removing the four screws holding the side inplace. Replace the defective tube.Note. Refer to preliminary instructions of opera-tional check, Table V, (par. 24) Test 3.Set the frequencycontrol shaft (knobhas beenremoved) at 600 mc. Set frequency meter usedin performing the alinement at 600 mc. Couplegriddipmeter totheantenna of the frequencymeter. Rotatethetuningcontrol ofthe griddipmeter until a null indicationis heard. Ifselectionofthetubedoesnotprovideanexactmatch, loosen the two screws on the cover abovethe name "MEGACYCLE METER" holdingthehairlinefiducial inpositionand move thefiducial slightly. Retighten the screws, andre-placethe side and the cover of the oscillatorunit.AGO ~ S A,CHAPTER6GENERALMAINTENANCE,26. GeneralGeneral maintenanceof the griddipmeterconsists of all standardshoppracticesandpro-cedures required to repair and maintain theequipment in serviceable condition, plus certainspecial proceduresdesignedtoaccomplishade-quate maintenance where unusual conditionsprevail withinthe equipment. General main-tenanceproceduresarenot intendedtoincludeoperational checks, tests, troubleshooting, orperformancemeasurements, anddo not requirethe use of special test instruments, as thesepractices are covered in chapter 5. Generalmaintenancedoes require, however, theuseofcommon and special tools and bulk suppliessuchasabrasives, solvents, sealing compounds,paints, andlubricants.27. ScopeThis general maintenance chapter providesadequate references toappropriate Departmentof the Army Technical Manuals, TechnicalBulletins, orotherArmypublicationsfor pro-cedureswhereshopmethodsandpracticehavealready been established. Specific maintenanceprocedures peculiartothe griddipmeter arecontained in the repair andrebuild chapters.28. UseThe repair and rebuild portions of thismanual aredivided into separate field (chapter7) anddepot (chapter8) maintenanceinstruc-tions. In general, the field maintenance respon-sibilitiesprescribedaredireCtedbythealloca-tionof maintenancepartslistedinthe appli-cablesectionofDepartmentoftheArmySup-plyManual ORD8 SNL J-739andtoolslistedin Type 4 SNLJ-29, section 3. The generalAGO3863Amaintenance shop practices and procedurespertaintoeither orbothfieldanddepot main-tenance, as required. Repair and rebuild in-formation in both the field and depot main-tenance chapters arebased uponthe assump-tion that personnel are familiarwiththeperti-nent general maintenance procedures coveredin this chapter. That is, specific references arenot made to individual general maintenanceprocedures, except wheredangertoequipmentorpersonnel isinvolved. Thesereferencesareomittedbecausethey wouldbe too numerous.Inviewofthis, itis especiallyimportant thatpersonnel usingthis manual be familiar withthe content of this chapter.29. Shop Methods and PracticesEstablished procedures for shop methods andpractices will befound in Department of theArmyTechnical Manuals, Technical Bulletins,andother Armypublications. General proce-dures applicable for the repair and mainte-nanceof the griddipmeter will befound inthe following list.Chassis rewiring TB 5-283-2Coldweather maintenance TBORD193Desert maintenance TB SIG 75Lubrication TM 9-2835Moistureand fungus-proofing .TBORD350Painting TM 9-2851Repair of meters, switches, and con- TB SIG 24nectors.Soldering TB SIG 222Tropicalization TB SIG 72Troubleshooting and repairof radio TM 11-4000equipment.These references are not to be construed asauthorityfor the performance byfield main-tenanceunitsofthosefunctionswhicharere-stricted todepotsandarsenals. Refer to para-graph 28.23CHAPTER7FIELDMAINTENANCESection I. GENERAL30. ScopeThischaptercontainsmaintenanceinforma-tioncoveringthegriddipmeter thatiswithinthescopeoffieldmaintenancepersonnel. Thescope of fieldmaintenance isdeterminedby thelistingoffieldmaintenancepartsintheappli-cable sectionofORD8 SNL J-739and thelist-ing of special tools authorized to field main-tenance personnel in Type 4 SNLJ-29, sec-tion3.31. Referencesa. General maintenance procedures are furn-ished in chapter 6. Individual references togeneral maintenancearenot madewithinthischapter. Itis, therefore, especiallyimportantthat personnel becomefamiliar with the con-tent of chapter6.b. Operation and organizational mainte-nance of the grid dip meter, as it is usedinelectronic shop AN/MPM-38, is covered inTM9-9505-1-30.c. Operational check and troubleshootinginformation is containedinchapter 5. Sche-matic diagrams are included at the end of chap-ter8. Thelegendsfortheschematicdiagramslist all replaceable electronic parts. Thelegendsfor figures 14, 16, and18list thebal-anceofthereplaceableparts. At thetimeofprintingof this manual, manufacturer's partnumberswereused, asordnance partnumberswerenot availablefor all parts. TheHnum-bers in thelegends are reference drawing num-bers of the Measurements Corporation. Themanufacturer's code for parts listed in thelegendfor theschematicdiagramare:Mir's code ManufacturerH MeasurementsCorporationDyR Cornell DubilierC . ChicagoTransformer CompanyQ , International Resistance CompanyPR Wirt CompanyMC Industrial Transformer Company2432. Repair and Maintenancea. P7'ecautions. Before attempting to re-placepartsortorepair assemblies, besuretofollowthe troubleshootingprocedures (chapter5) inordertoisolate thesource oftroublecor-rectly. Incorrectreplacement of partsandin-adequaterepairpracticescancomplicateexist-ing trouble. Use the proper tools (pars. 12-15)for each replacement and repair procedure.Fo]owingthecompletionofrepair orreplace-ment, it sometimes is necessary to clean orretropicalizepartsor subassemblies. Refer toparagraph29for referencetogeneral instruc-tionsonsuch procedure.b. Replacement Policies. Most electroniccomponents arenot economically reparableandgenerally, when defective, are to be replacedrather than repaired. Capacitors, resistors,and,in general, all sealed or potted components,such as transformers and coils, areto be re-placed when defective. Defective unsealedswitches are reparable when thedefect consistsof dirtyor corrodedcontacts; otherwise, theymustbereplaced. Ifpossible, replaceadefec-tive part with an exact duplicate. When aduplicateisunavailable, substituteapartwithsimilar electrical characteristicsandequivalenttolerance. Beparticularlycareful inselectingthereplacementsfor resistors, capacitors, andtubes. Insignalcircuits, substitute partswiththe same physical sizes toavoidaltering circuitinductanceandcapacitanceandaffectinghighfrequencyresponse. Itispermissibletouseareplacement withavoltageratinggreater, butnever less, than that for the part to be replaced.See the parts identity illustrations(figs. 14-18)when replacing parts in order to locate thepartpositionandterminal connections. Refertoparagraph33ofthischapterfor standardsapplyingtohandlingof disassembledcompon-AGO38631\,+IicR13 II J3D(NOT SHOWN) \A-Handle, H-2024B-Bal' knob: IV, inches. H-4133C-AC cord: moldedplug, H-704D-lVIounting foot: felt cushion, H-4204-1E- CableclampF-Roundknob: fluted (no marking') H-27\J1Figlu'e 14. Power supply unit,parts identifieatiOJI.ents and to paragraph 29 for references tosoldering and dressing wire.Note. Parts identityillustrations (figs. 14-18) iden-tify electronic parts by reference designation only.Refer to the legends to the schematic diagrams (figs.20and21) forfull description, values, andpartnumbersfor theparts.c. Replacem,ent Practices. Before unsolder-inganyconnectionpriortoremovingcompon-entstobe replaced, besuretoremovetropicali-zation varnish on the connection. Observepolaritymarkingsonsuchpartsas capacitors.Mount electronic components on terminals sothat thecolorcodereadsfromtoptobottomorfrom left to right. Wrap leads clockwisearound thebottomterminals. Avoidobscuringany identification markings on the terminalboardandchassis. Inanycase, trytomounta replacement in the position formerly occu-piedbythepart beingreplaced. Ifanywires25WHITEAC CORD3R33R22TSlRA PD238635Figure 15. Terminalstrip identification.Figure 16. HF oscillator unit, pa1ts identification.26AGO3863AFigw'e 17. G1'id dipmeter,plug-in eoils identifieation.aremovedduringthe process of part replace-ment, restore themto their original positionswhen replacement is complete. When replac-ingmechanical parts such as structural mem-bers that attachwithscrews orbolts, placethelockwashers next to the nut or screwwhichturns. When necessary, place a flat washerbetween the lockwasher and the stationarysurface.d. Replacement Definitions. Repair of elec-tronic materiel can be accomplishedinone offiveways. Thefirst isreplacement of adefec-tivepartandispreferredwhenpossible. Thesecondisrepairofaportionofapart, suchasthereconstructionofabrokensocketterminal.Thethirdis rebuildof anentirepart, suchasthe cutting of a formand the winding of acoil tomake a reactor. Thefourth is substi-tution of anequivalent part, such as replace-ment of a500-ohm 2-watt resistorby two1000-ohm I-watt resistors connected in parallel.AGO3863AThelastisanemergencyfixwhichcanbecon-sidered temporary only. Parts must be re-paired only when replacement is impossible,andrebuilt or improvisedonlywhenrepair isimpossible. An emergency fix only partiallyrestores defective materiel and must be usedonly when repair is impossible or when theurgency of a tactical situation in the field makesanyother method of placingmateriel intoop-erationimpossible. Emergencymeasures willbetakenonlywhenthemaintenancetobeper-formed has been authorized by a responsibleofficer.33. Handling of Disassembled PartsAlways assume that materiel disassembledby one person will be assembled by another.Therefore, unless the method of assembly isobvious make a suitable sketch showing theorientationof thecomponents beforedisassem-bly. Note thepositionof componentsandwir-27RAPD406395V101V102ABCl0l THROUGH Ci04ASSEMBLY L101,/V102ABV10l'-CJ05R102C106. . . . . . : : ~ . . . . . . . (INSIDECI01-C104SHIELD)CC101R101(NOT SHOWN)C107C108L1 02L103L104L105(INSIDEC101-C104SHIELD)WlOPP 1 0 1 ~(NOT SHOWN)) I.EA-Tubeshield. TSI02U03B- Tubesocket. H-5374C-Dial scale, H-2788-AD-Fidt:eial, H-2788-BE- Knob, H-2788PigU.1'C78, UHPoscillator unit, jJrLl'tsidcntiji.crttioJl,ing, andif several leadsareinvolved, tageachsothat it canbeconnectedcorrectly. Aseachmetal component isremoved, establishitsexactposition in relation to other components bysuitably scribed reference marks. However,never scribemarksoncontactsurfacessuchasthreads and slide rails. Note polaritymark-ings on capacitors and other components somarked. Use a parts tray or other suitablereceptaclesothatcomponents, asremoved, canbeplacedinthepositionstheyaretooccupyinrelation to the complete assembly. Alwayskeep each component in its relative positionuntil it istobeinstalled. Whenindoubt astowhatposition acomponent or wireis to occupy,refer to the component identity illustrations(figs. 14-18) and to the schematic diagrams(figs. 20 and 21). Keep hardware in a sackattachedtothe disassembledcomponent if in-stallationisnot tobemadeimmediately.28AGO3863ASection II. FIELDMAINTENANCEPROCEDURESI~;34. Disassembly of Power SupplyThe bottomplate and power supplychassismust be removedfromthe power supplycasebefore any components of the front panel ofthecasecanberemoved. Thebottomplateisremovedbyremovingfour self-tappingscrewswhich are located at the base of thesides of thepower supplycase. Thepower supplychassisis removed by removing four self-tappingscrews which are located verticallyalong thesides of thepower supplycase. Pullthepowersupply chassis down and out of the powersupply case to facilitate further disassemblyprocedures. Tagall wiresleadingtocompon-ents that are to be removed, and record theorientationofeachcomponent beforeit is re-movedtofacilitate reassembly.35. Repair of Power SupplyNospecial proceduresarerequiredtorepairthe power supply unit of the grid dip meterother than standard shop procedures as de-scribedinchapter 6. All direct support fieldreplaceable parts forthe powersupply unit areillustratedandidentifiedinfigures 14and15.All partsareschematicallyidentifiedinfigure20.36. Assembly of Power SupplyAfter defective components have been re-placed and all wiring completed, the powersupply chassis is installed first. Place thepower supply chassis into the power supplyc;ase and aline the four mountingholes, theninsert the mountingscrews and tighten. Placethe bottom plate into the power supply case andaline the mounting holes, then insert the mount-ingscrewsandtighten.37. Disassembly of HFOscillatorandOscillatorCaseThe dial cover and calibrated dial must beremoved before any part of the oscillator ismadeaccessible. Loosen thetwoset screws onthetuningcontrol knobandremovetheknob.Beforeremovingthedial cover fromthecase,mark itsposition with reference to bottompor-tion of case. Remove the three round heads r ~ w s fromtheside of thecase, t ~ n lift offAGO3863Athedial cover. Beforeremoving thecalibrateddial, turn the tuning control shaft in a fullclockwise direction, and locate some point onthedial inrelationtosomepoint ort thecase.Remove the threescrewson thetopof thedial,and remove the dial and three fiberwashers.Caution: The dial should be kept faceup andcoveredduringthe timeit isout of the case.Careshouldbetakennot tosmearor mar thecalibrated dial. The components of the oscil-lator arefragile and easilybent or damaged;therefore, careshouldbeexercisedduringdis-assembly procedure.All components of the oscillator assembly areaccessible, andnormal repair procedurescanbeused to repair or replace components of theoscillatorassembly. Care mustbeexercised tokeep the placement of parts and the lead lengththesameasoriginallyinstalled.38. Repair of HF OscillatorNospecial proceduresarerequiredtorepairthe HFoscillator unit of the grid dip meterother than standard shop procedures as de-scribed in chapter 6. All direct support fieldreplaceable parts for the oscillator are illus-trated and identified in figures 16 and 17.Electronic components are schematically iden-tifiedinfigure 20.39. Assembly of HF Oscillator and OscillatorCaseAfter components have been installed, thecalibrated dial should be installed as follows.Turn the tuning control shaft in afull clockwiseposition. Place the thin fiber washer on thecalibrated dial mounting plate and aline theholes. Placethecalibrateddial onthemount-ingplate, andorientthedialwiththepointonthecaseinthepositiondescribedinparagraph37. Place the heavyfiber washerintothecali-brateddial andalinetheinsert withtheholesin the mounting plate. Place the remainingfiber washer on topof the dial and aline theholes. Then insert and tighten the threescrews. Placethecover ontheoscillator caseandaline the cover to alinement markas re-corded in paragraph 37. Insert and tighten thethree roundheadscrews.29Note. The griddip meter must be calibrated when-ever thetop cover is removed. Refer to the alinementand calibration instructions(par. 25).40. Disassembly of UHF Oscillator UnitThe tuning knob must be removed first.Then, remove the screw in the sealed cupwasher at thecenter of thehexagontopcover.Remove the screws located on the right andleft edgesof thecover.Caution: Do not disturbthe screws above thename "MEGACYCLE METER" on the cover.Lift offthecover. Removethefour screwsintheside of the case, andremovetheside. Thismakes all replaceableor reparable componentsof theoscillator unit accessible, andnormal re-pairprocedurecanbeusedtorepair or replacecomponents of the oscillator unit. Extremecaremust be exercisedtolceep the placementofpartsandtheleadlengththesameasorig-inally installed. Disassembly beyondthispointis not recommended, as critical adjustmentsmaybedisturbed.41. 'Repair of UHF Oscillator UnitNo special procedures are specified for theTUNINGCONTROL SHAFT 1OIL AT 6 MONTH INTERVALS IVARIABLECAPACITORROTORBEARING, OIL'. AT 6 MONTHINTERVALS......,repair of the uhf oscillator unit other thanstandardshopproceduresdescribed inchapter6. All direct support field replaceable partsare illustrated and identified in figure 18.Electronic components are schematically iden-tified in figure 21. Mechanical parts withinthe UHFoscillator unit require precision as-semblyandare not separatelyreplaceable, ex-ceptforcommonhardware.42. Assembly of UHFOscillator UnitAssembly of the uhf oscillator unit is thereverse of the disassemblyprocedures describedinparagraph40.Note. Thecalibration of thegriddipmetermust bechecked as outlined in paragraph 25, after reassemblyof the uhf oscillator unit.43. LubricationThe lubrication points and lubrication timeintervalsfor thegriddipmeter oscillator unitareshowninfigure19. Aircraft oil, specifica-tionMIL-O-6085, should be usedsparinglyatindicated oilpoints. A light grease such as air-craft and instrument grease, specificationMIL-G-3278, should be used at indicated greasepoints.30Figu?'e 19. Grid dip meter HF oscillator unit, tub?'icationpoints.AGO3863ACHAPTER8DEPOT MAINTENANCESection I. GENERAL44. ScopeThischaptercontainsmaintenanceinforma-tioncoveringthe rebuildandrewiringof thegriddipmeter.45. Referencesa. General maintenanceprocedures andshoppractices are discussed in chapter 6. Indi-vidual references to general maintenance arenotmadewithinthischapter. It is, therefore,especially important that personnel becomefamiliarwiththecontent ofchapter 6.b. Operation and organizational mainte-nance of the grid dipmeter as it is used inelectronic shop AN/MPM-38, is contained inTM9-9505-1-30.c. Theoryofoperationiscontainedinchap-ter 2. Operational check andtroubleshootinginformationis contained in chapter5. Asche-matic diagram is contained at the end ofchapter9.46. Handling Disassembled PartsThe procedures for handling disassembledparts andthe procedures for disassemblyarecovered in chapter 7.Section n. REBUILD AND REWI:RINGlocate thereferencesymbol andterminal num-ber ateitherwireend, intheTocolumn. TheFromcolumnwill indicate the correct termina-tion of the opposite end. Figure referencesshowingthephysical locationofeachtermina-tionaregiven.c. Toreattachloosewires after replacingacomponent part, locate thereferencesymbol ofthe replacedpart on the list. ,Eachterminalonthis part is identifiedwithits correct con-nection or termination point. Connect thewiresaccordingly.d. Torewire thepowersupplychassis, referto the parts identificationillustrations (figs. 14and 15) to determine which component partshouldbewiredfirst. Thenrefer tothewirelist fortheproperwiretouseandfor thecor-rect terminations. Third, refer to the partsidentificationillustrationfor thegeneral posi-tion anddress of the wire. Place the newwirein the general position of the original wire.Repeat these, steps foreach wire installed.48. Wire Lista. The wirelist (table VI) contains infor-mation that enablesthetechniciantoreplaceasingle wire,reconnectawire, trace wiring con-nections, or perform acomplete rewiring. Thelist is in order by electronic part referencedesignation, andgives adescriptionof the wireconnected to each terminalof each part, aswellas the destination or opposite termination ofeach wire. Each wire and each terminationap-pears twiceinthelist; onceintheTocolumnand once in the FromcoluITm.b. To traceawire or to install asinglewire,47. GeneralThis section contains maintenance instruc-tionsfor therebuildandrewiringof thegriddip meter. Rewiringinstructions, along withthefieldmaintenanceproceduresinchapter 7,aresufficient toenableexperiencedtechnicianstorebuildthegriddipmeter.it.AGO3863A31Table VI. WiringList forGrid Dip MeterPower SupplyUnitFrom ToI I I ILengthRef. Fig. Ref. Fig-. Color (inches) Gagedesig. Term. ref. dESig. Term. ref.C1A -------_. 14 R13 Top 14 WHT-RED 6 20C1B -------_. 14 TS1 3 14 WHT-RED 2 20ClB --------. 14 L1 _._-----_. 14 BLK 4 20C7 1 14 XV1 2 14 WHT-RED 18 20C7 2 14 J1 3 14 WHT-ORN 5 20C8 1 14 S2 6 14 WHT-ORN 11 20C8 2 14 S2 1 14 WHT-ORN 9 20J1 1 14 J3 1 14 WHT-BLK 12 20J1 2 14 S2 5 14 WHT 14 20J1 3 14 C7 2 14 WHT-ORN 5 20J2 1 14 M1 1 14 WHT-BLK 6 20J2 2 14 S2 11 14 WHT-GRN 11 20J2 2 14 J3 5 14 WHT-GRN 15 20J2 3 14 R6 3 14 WHT-GRN 2 20J3 1 14 J1 1 14 WHT-BLK 12 18J3 1 14 Grd lug _ ~ _ 14 Bare % 20J3 2 14 XV2 7 14 WHT 7 20J3 3 14 S2 2 14 WHT-BLU 18 20J3 5 14 J2 2 14 WHT-GRN 15 20J3 7 14 T1 -------- 14 GRN 4 20J3 7 14 XU 1 14 WHT-BRN 12 18J3 7 14 Grd lug -------- 14 Bare% 18J3 8 14 T1 -------- 14 GRN 4 18J3 8 14 XV2 3 14 WHT 6 20J3 8 14 XU 2 14 WHT-BRN 12 20L1 -------_. 14 ClB -------- 14 BLK 4 20L1--------"14 R13 Top 14 BLK 4 20M1 1 14 J2 1 14 WHT-BLK 6 20M1 2 14 TS1 2 14 WHT 17 20R2 1 14 TS1 3 14----------- -------- -----R2 2 14 TS2 3 14----------- -------- -----R3 1 14 TS2 2 14------------------- -----R3 2 14 TS2 3 14----------- -------- -----R5 1 14 TS1 2 14----------- -------- -----R5 2 14 TS2 2 14----------- -------- -----R6 1 14 TS1 1 14 WHT-GRN 14 20R6 1 14 J2 3 14 WHT-GRN 2 20R6 2 14Grounded through the mounting.R6 3 14 TS2 2 14 WHT-YEL 14 20R7 1 14 TS1 1 14~ -------- -----R7 2 14 TS1 2 14----------- --------- -----R13 Top 14 L1--------" 14 BLK 4 20R13 Top 14 C1A-------_. 14 WHT-RED 6 20R13 Bottom 14 XV1 2 14 WHT-RED 6 20R14 1 14 S2 1 14------------------_.-----R14 2 14 S2 12 14------------------------S1,1 14 TS1 4 14 WHT-PR 12 20S1 2 14 TS2 1 14 WHT-PR 12 20S2 1 14 C8 2 14 WHT-ORN 9 '20S2 2 14 J3 3 14 WHT-BLU 18 20S2 5 14 J1 2 14 WHT 14 20S2 6 14 C8 1 14 WHT-ORN 11 20See footnotesat endof table.32Remarks(1)(1 )(1)(1)(1)(2)(2)(2)(2)(2) I(2)tt(2)I (2)(1)I!(2) I(2)AGO3863ATableVI. Wiring List forGrid Dip Meter-ContinuedPower SupplyUnit--Continued--ToII IColor LengthIRef. Fig.(inches) Gage Remarksdesig. Term. ref.J2 2 14 WHT-GRN 11 20XV2 5 14 WHT-RED 18 20TS2 1 14 BLK 5 20 (1)TS2 4 14 BLK-RED 5 20 (1)J3 7 14 GRN 4 20 (1)J3 8 "!.4 GRN 4 20 (1)XVI 2 14 YEL-ORN 4 20XVI,8 14 YEL-ORN 4 20 (1)XVI 4 14 RED 4 20 (1 )XVI 6 14 RED 4 20 (1)Grd lug 14 BLK-YEL 3 20 (1)Grd lug 14 RED-YEL 3 20 (1)R7 1 14 ---------------- (2)R6 1 14 WHT-GRN 1420R7 1 14----------- -------- -------- (2)Ml 2 14 WHT 1720R2 1 14----------- -----------------(2)ClB --------_. 14 WHT-RED 2 20 (2)81 1 14 WHT-PR 12 20WI ------- 14 BLK 6 ft. 1881 2 14 WHT-PR 12 20Tl 14 BLK 5 20 (1)R3 1 14----------- -------- --------(2)R5 2 14----------- ---------------- (2)R6 3 14 WHT-YEL 1420R3 2 14----------- -------- -------- (2)XV2 5 14 WHT-RED 3 20Tl -------- 14 BLK-RED 5 20WI -------- 14 WHT 6 ft. 18TSI 4 14 BLK 6.ft. 18T82 4 14 WHT 6 ft. 18J3 7 14 WHT-BRN 12 20J3 8 14 WHT-BRN 12 20C7 1 14 WHT-RED 18 20R13 Bottom 14 WHT-RED 6 20Tl -------- 14 YEL-ORN 4 20 (1)Tl -------- 14 RED 4 20 (1)Tl -------- 14 RED 4 20 (1)Tl-------- 14 YEL-ORN 4 20 (1)Grd lug-------- 14 Bare 1 20J3 8 14 WHT 6 2082 12 14 WHT-RED 18 20T82 3 14 WHT-RED 3 20J3 2 14 WHT 7 20--_.141414141414141414141414141414141414.1414141414141414141414141414141414141414141414141414122224682355714112233441122233411121 Transformer T1andreactor L1 are furnishedwith flexibleleadsextendingfrom the unit.2 These resistorsare mounted withtheir ownaxialleads.Note. For oscillator sectionwiringrefer to paragraph 48e.8282TlTlTlTlTlTlTlTl1'1TlTSITSIT81TSIT81T81T81T81T82T82T82TS2T82T82T82T82T82WIWIXUXUXVIXVIXVIXVIXVIXVIXV2XV2XV2XV2XV2From

AGO3863A33rIII//J2 IrHONESl/ IIII/

- - - -RAPD411409*MICROFARADS, AND NOTES, OHMS, MICRO OTEO1. VAWESOTHERWISE NFROMREARHENRYS CHES"VIEWEDWAFER SWIT 2. ALLW2T1- - - t' diagram.chemaw Grid dip meter, S Figure20.

"" '-- --- ---IIIIII

//\J5C1A, ClBC2C3, C4, C5, C6, andXV3C7, C8C911J1, J2J3L1L2L3L4L5L6L7L8L9K10M1P2R1R2R4R5R6R7R8, R10, R15, and R16R9R11, R12R13R14S1S2T1V1V2V3W1W2XV1, XV2XV3ELECTROLYTICFIXEDCAPACITOR: 10-10 ",f, 450v, 200/0 FP231NotusedCAPACITORASSEMBLY: consistingof twofixed mica capacitors 50",,,,f eacha twosection variablecapacitor, -10 to110 ",,,,f each, and onetube socket foracorn tubeV3,HM403.Note. Capacitors C3, C4, C5, and C6, and tube socket XV3 comprise a mechanical assembly.Individualpartsare notseparatelyreplaceable.PAPERFIXEDCAPACITOR: 0.5",f, 600vdcw200/0, DYR6050CERAMICFIXEDCAPACITOR: 1500",,,,f, 500vdcw+500/0-200/0, H-5011INCANDESCENTLAMP: #44, 6-8v, 0.25amp, 187189TELEPHONEJACK: (Carter type32or equiv.), H-5312OCTALSOCKET8243107REACTOR: 4.5H10%@50 rna dc, C-1706RFCOIL: 2.2to5mc, H-3190-1RFCOIL: 5to10mc, H-3190-2RFCOIL: 10to22mc, H-3190-3RFCOIL: 22to45mc, H-3190-4RFCOIL: 45to 100mc, H-3190-5RFCOIL: 100to250mc, H-1973RFCOIL: 200to400mc, H-1974Not usedRFCHOKE: (coil woundonresistor), H-1980METER: 200",amp, 400ohmsdcresistance, H-740CONNECTORPLUG: 8prongoctal, H-5314NotusedFIXEDRESISTOR: 680 ohm, 2w, 50/0, RC42GF681JNotusedFIXEDRESISTOR: 35K, Ihw, 50/0, RC20GF333JVARIABLE RESISTOR: 10K, 14w, 200/0, Q13-16FIXEDRESISTOR: 1K, Ihw, 50/0, RC20GF102JFIXED RESISTOR: 6,800ohmsYe;w, 100/0, H-5248-6FIXEDRESISTOR: 470ohmIhw,50/0, RC20GF471JNotusedFIXEDRESISTOR: 1K, lOw, 100/0, wirewoundPR3FIXEDRESISTOR: 5,600ohms, 2w, 50/0, RC42GF562JTOGGLE SWITCH: spst, H-383-1ROTARYSWITCH: 3p3t, H-2140POWER TRANSFORMER: 117V, 50/60 cps, SEC #1-240-0-240 VAC @.020 amp,SEC#2-5.0VAC@2.0ASEC#3 VAC@0.3A, MC-B2572-F.ELECTRONTUBE: 5Y3WGT8298921ELECTRONTUBE : OD3/VR150, 8298910ELECTRONTUBE: 955POWERCABLE: 2conductor, #18AWG, 300v, 6ft., H-704SPECIALPURPOSE-CABLE: 5conductor, H-2786TUBESOCKET: OCTAL8243107See capacitor C3Figure20-Continued.e. TorewireHFoscillatorunit, refertotheparts identification illustration (fig. 16) todeterminegeneral location of part or wire tobereplaced. CableW2must bereplacedas awhole cable. Refer tothe schematic diagram(fig. 20) for identificationof thewiresinthecable. Resistors R8 andR16 are soldered inseries with 1J2 inch spacing between the re-sistors, andaredirectlysupportedbetween thegridterminal (3) ofV3andthetiestripter-AGO3863Aminal nearest thefront panel. Resistors R10and R13 are connected in a like manner be-tween the plate terminal (2) of V3, and thetiestripterminal nearest therear ofthecase,TheRFchoke, L10, is connectedbetweenthecathode terminal (5) ofV3andthecenter ter-minal of the tie strip. One sideof the filamentterminal (4) is grounded directly in the mount-ing. A2-inch piece of 20-gage wire is con-nectedfromthe other filament lead, terminal(1) of V3 andthe filament bypass capacitor.Resistor R9 mounts fromthe terminal near thetuningshaft andthe ground lugas showninfigure 16.Caution: All partsreplacedintheoscillatorsectionmust beinstalledinthe samerelativepositions occupied by the original parts.f. Rewiring instructions are not applicableto the uhf oscillator unit because all replaceableelectronicpartsareconnecteddirectlytotubesocket terminals,groundterminals, ortootherparts. Capacitors C101throughC104are r:e-placeable onlyas a single assembly, and thisassemblyisconnecteddirectlytopins6and7of tube socket V10l. Cable W101 fromthepower supplysectionhasfive leads; theblackandbrownleadsareconnecteddirectlytopin7 of tubeV102and theredlead is connectedtopin1 of tubeV102; thegreenandwhiteleadsare connected directlytofeed-throughcapaci-tors C106 and C107, respectively. Refer tofigures 17and21for cableleadsandpartslo-cationandidentificationinformation.49. PartsLocationandIdentificationIllustrationsa. Partsidentification illustrations (figs. 14-18) provide physical locationandidentificationinformationfor all electronicparts. Descrip-tionsofelectronicparts, byteferencedesigna-tions, are contained in the parts legends forthe schematic diagrams (figs. 20and 21). Me-chanical parts andhardwareother thancom-monhardwareare alsolocatedonpartsidenti-fication illustrations by means of key letters.Thesekeyletters arelisted inlegends accom-panying the parts identification illustrationsandprovideshortdescriptions andpart num-bersfor thesemechanical parts.b. Where necessary, electronic partsintheparts identificationillustrations havebeenas-signedarbitraryterminal numbersinordertoidentify the exact terminals tobeused forcon-nectionsinaccordancewiththewirelists.50. Final Inspection of RewiringWhenrebuildof thegriddipmeter is com-pleted, make a thorough examination of all wir...ing connections, cross-checking between theequipment, the wiring table(table VI, par. 48),andthe schematicdiagram(fig. 20). Detec-tionofawiring errorbeforepower isappliedmayprevent serious damage' and unnecessary36,------""""\./UHF OSCII.LATOR UNIT"-/"/"-/Cl08"470L102Cl03W101(X.13),......I 1IIIC104I13IVl02 Ll01I082IIII-II ICl07I470IIl-!-Rl02L104 L103-) Cl0615KP101I"-470/NOTE: J3I"-;./ALL VALUESINI,OHMSAND"/MICROMICRO-IFARADS"/J......'------./RA PD4063BBFigure 21. UHF oscillator unit, schematic diagram.AGO3863AC101, C102, C103,C104, XV101C105C106, C107, C108L101L102L103, L104L105P101R101Rl02V101V102W101CAPACITORASSEMBLY: consistingof twofixed micacapacitors 13 f.Lf.Lf each, a twosection variable capacitor, andone tube socket for V101(6AF4) H-4614.Note. Capacitors CIOI, CI02, CI03, and CI04, andtube socket XYlOl comprise a mechanical assembly.Individual parts are not separatelyreplaceable.CERAMICFIXEDCAPACITOR: 4.7 f.Lflf, 500vdew, 100/0, H-5372CERAMICFIXEDCAPACITOR: 470 f.Lf.Lf, 500vdew, 200/0, H-5373RF COIL: H-4635RF COIL: H-4639RF COIL: H-4636RF COIL: H-4638CONNECTOR PLUG:8 prong octal, H-5314FIXED RESISTOR: 470 ohm, 2w, 100/0, RC42GF471KFIXED RESISTOR: 470 ohm, 1h w, 100/0, RC20GF471KELECTRONTUBE: 6AF4ELECTRON TUBE: OB2,7599321SPECIAL PURPOSECABLE: H-886Figure21-Continued.. Irework. When all Wlrmg has been double-checkedand proven to be satisfactory, installthetubesintheir socketsexceptfor therecti-fier tube. Measure the resistance from thecathode pin of the rectifier socket to chassisground. The resistance should be approxi-mately280K. Adeviationof morethan 20percent indicates a defect in the B+ circuitthat must be corrected beforepowerisapplied.AGO8863AApply power with the rectifier tube removedfrom socket and observe that filaments ofother tubes glow. Ifnomalfunctions are ap-parent, install the rectifier tube and examineall partsof thegriddipmeterfor evidenceofshort circuits. When this inspection is com-pleted, proceed with the final inspection(chapter9).37CHAPTER9FINAL INSPECTIONAND R'EPAIRSTANDARDS51. GeneralFinal inspectionis anacceptanceinspectionperformedafterrepair andrebuildoperationshave been completed to insure that the materielis acceptable according to established stand-ards. Final inspection of thegriddip meterconsists of a visual inspection and an opera-tional check.52. Visual Inspection.Visuallyinspect thegriddipmeterfor com-pleteness of parts. Use the illustrations infigures14,15, 16, and17 forthispurpose. In-spectpowersupplyunit andoscillatorunit forphysical defectsordamage.53. SolderingMost electrical connectionsmust besolderedtoinsurethat a goodelectrical bondismade.Theoxidationor corrosionthattakesplaceinanunsolderedor poorlysolderedjoint will re-38suIt inintermittentor faultyoperationofthegriddipmeter. Connections must be mechani-cally secure and contact surfaces clean andbrightbeforesolderisapplied.a. Whena joint has been soldered, chiporscrape any excess deposit of flux from the joint.b. Inspect the connection forevidence of coldsoldering. See that an excessive amount ofsolder hasnotbeenusedandthat thesolderisnot touchinganadjacent terminal or conduct-ingsurfaceofsomeotherpart.c.If the joints have been previol,lsly tropical-ized, applytropicalizationvarnishaccording toinstructionsgiveninTBORD350.54. Operational CheckConduct acompleteoperationalcheck (tableV, par. 24) after the visual inspection to becertainthegriddipmetermeetsall electronicspecifications.AGO3863AAPPENDIXREFERENCES1. Publication IndexesDApamphlets ofthe310seriesandDAPam108-1shouldbeconsultedfrequentlyfor latestchanges or revisions of references giveninthis appendixandfor newpublications relatingtomateriel coveredinthis technical manual.2. Supply ManualsThe following manuals of theDepartment ofthe Army SupplyManualpertaintothismateriel.a. Destruction toPTevent EnemyUse.Explosives, BulkPropellants, Explosive Devices_______________________________ SM9-5-1375b. GenemLIndexofSupplyManuals, OrdnanceCorps_________________________________ DAPam310-29Introduction____________________________________________________________________ ORD1c. Repair and Rebuild.Field and Depot Maintenance Allowances forHeavy Maintenance Test Equip- ORD8 SNL J-739ment Set (CORPORAL Type II Ground Guidance Equipment)-Applicablesection of.Special Tool Sets forCORPORAL Type IIGuidedMissileMateriaL___ Type4SNL J-29, Sec.3Standard Electrical Components________________________________________ ORD5 SNL H-4Standard Hardware ORD5 SNL H-13. FormsThe following formspertain tothis materiel:DA Form 5-31, Shop Job Order Register.DA Form 9-1, Materiel Inspection Tag.DA Form 9-79, Parts Requisition.DA Form 9-80, Job Order File.DA Form 9-81, Exchange Part or Unit Identification Tag.DA Form 421, Stock Record Card.DA Form 460, Preventive Maintenance Roster.DA Form 468, Unsatisfactory Equipment Report.DA Form 478, Organizational Equipment Report.DA Form 81, Work Request and Job Order.DD Form 6, Report of Damaged or Improper Shipment.4. Other PublicationsThe followingpublicationscontaininformationpertinenttothismaterielandassociatedequip-ment:a. Destruction toPrevent EnemyUse.Explosives andDemolitions_____________________________________________________ FM5-25Regulations forFiring Ammunition forTraining Target Practice, andCombaL____ AR385-63b. General.Carbon-Tetrachloride; Technical-Grade_________________________________ FedSpecO-C-141AGO3863A39Demolition Materials TM9-1946Inspection ofOrdnance Materiel inHands ofTroops____________________________ TM 9-1100UnsatisfactoryEquipment Report____________________________________________ AR700-38Precautions inHandlingGasoline_____________________________________________ AR850-20Ordnance Maintenance andGeneralSupply in theField____________________________ FM9-10Ordnance Service in theField___________________________________________________ FM9-5Accounting for Lost, Damaged, orDestroyedProperty -"-_ AR735-11Accident Reporting andRecords______________________________________________ AR385-40c. Preservation, Packaging,and Packing.Army ShippingDocumenL_________________________________________________ TM38-705InstructionGuide: OrdnancePreservation, Packaging, Packing, Storage, andShip- TM9-1005ping.ReportofDamagedorImproper ShipmenL___________________________________ AR700-58Ordnance Operational List of Specifications and Instructions for Packaging and SB 9-156ProcessingGeneral Supplies.Preservation, Packaging, andPackingMaterials, Supplies andEquipment Usedin SB38-100the Army.Preservation, Packaging, andPackingofMilitarySuppliesandEquipmenL_______ TM38-230ProtectionofOrdnanceGeneral SuppliesinOpenStorage_____________________ TBORD379StandardsforOversea ShipmentsandDomesticIssueofOrdnanceMaterielOther TBORD385than Ammunition and Army Aircraft.Preparationfor ShipmenL___________________________________________________ AR740-20d. Repair and Rebuild.Abrasive, Cleaning, Preserving, Sealing, Adhesive, andRelated Materials for Ord- TM9-850nance Materiel.BasicArctic ManuaL_______________________________________________________ FM31-70Desert Maintenance of GroundSignal EquipmenL______________________________ TBSIG75Cold-WeatherLubrication; OperationandMaintenanceof ArtilleryandSighting TBORD193and Fire Control MaterielInspectionProcedurefor RepairedElectrical IndicatingInstruments_____________ TBSIG24Instruction Guide: Operation and Maintenance of Ordnance Materiel in Extreme Cold TM9-2855(00to _650 F.).InstructionGuide: WeldingTheoryandApplication____________________________ TM9-2852Lubrication TM9-2835Moisture andFungus-Proofing TreatmentofAntiaircraft Artillery "On-Carriage" TBORD350FireControl Equipment andAssociatedCable Systems.OperationofSignalEquipment atLowTemperatures__________________________ TBSIG219Operations in the Arctic______________________________________________________ FM31-71Soldering_________________________________________________________________ TBSIG222Painting Instructions forFieldUse -,-______________ TM9-2851Tropical Ma.intenanceofGroundSignal EquipmenL____________________________ TBSIG72Troubleshooting and Repair of RadioEquipmenL______________________________ TM11-4000Varnish, Moisture- andFungus-Resistant, for theTreatment of Communications MIL-V-173AElectronic, and Associated Electrical Equipment.e. Related Use.Operation: Truck-Mounted Electronic Shop AN/MPM-38_________________ TM9-9505-1-30Operation: HeavyMaintenanceTest Equipment 8501900__________________ TM9-9509-1-45f. Special Equipment.Operation, Organizational Maintenance, andFieldandDepot Maintenance: Fre- TM9-9504-6quency Meter8026531.OperationandMaintenance: Meter Calibrator 8027828______________________ TM9-9504-41OrdnanceMaintenance: ElectronicVoltmeterME-119/MPM-38____________ TM9-9508-4-3540AGO3863A!JINDEXParagraphsAlinementandcalibration 25Application of grid dip meteL__________ 5Assembly:Oscillator andoscillatorcase 39,42Power supply_____________________ 36Authorized forms. (SeeForms, records,andreports.)Description-_ __ 5Differenceamongmodels_______________ 6Disassembly:Oscillatorandoscillatorcase 37,40Power supply 34Dressingwire__________________________ 32Soldering_____________________________ 29 23Special tools and equipment (table IV) 15 11Symbols anddesignations_______________ 4 4Repairandmaintenance 26-50 23-36Report of unsatisfactory equipment ormateriels. (SeeForms, records, andreports.)Electronic data (tableII) _Field and depot maintenance allocation _Fieldreport of accidents. (See Forms,records, andreports.)Forms, recordsandreports _Handling ofdisassembled parts _82333Pages22429,30294529,30292452227ParagraphsMaintenance-ContinuedAssemblyof powersupply__________ 36Disassembly of oscillator andoscil- 37latorcase.Disassemblyofpower supply________ 34Lubrication_______________________ 43Operational checkandtrouble- 24shooting.Operationalcheck. (See Maintenance.)Physical data (table1) 7Pages29292930165Inspection:Final inspection andrepair 51-54standards.Final inspectionofrewiring________ 50Inspectionofgeneralcomponents 20-21of the griddip meter.In-process________________________ 18Inspectionofelectricalcomponents 21of the grid dipmeter.Inspection ofmechanical components 20of the grid dip meter.Lubrication___________ 43Maintenance:Alinementandcalibration__________ 25Assembly of oscillator and oscillator 39case.AGO3863A383615141515302229Theory:Powersupply 10, 11Oscillator section lO, 11Tropicalization_______________ 29Troubleshooting (tableV) 24Tube complement (table III) 8Tables:Electronic data(table II) 8Operational checkandtroubleshoot- 24ing of grid dip meter (table V).Physical data (table I) 7Specialtools and equipment (table 15IV).Tubecomplement (table III) 8Wiring list for grid dip meter (table 48VI).6,76,72316551651153141[413.6(19 Jan 59)]ByOrderof Wilber M. Brucker, Secretaryof the Army:Official:R. V. LEE,Major General,United States Army,The Adjutant General.MAXWELLD. TAYLOR,General, United States Army,Chief of Staff.Distribution:ActiveArmy:DCSLOG(1)Tech Stf DA(1) exceptCofOrd (17)Ord Bd (2)USAArty Bd(3)USAArmor Bd(3)USA Inf Bd(3)USAADBd(3)USAAbn&Elct Bd (3)USAAvn Bd (3)USA Arctic Test Bd(3)USCONARC(3)USARADCOM(2)USARADCOMRgn (2)OS MajComd (5) exceptUSARCARIB(None)LogComd (3)MDW(1)Armies (3)NG: State AG(3).USAR: None.Forexplanation of abbreviations used, see AR 320-50.42USAAMC(2)USAADCen (2)USARADSCH(5)USAOGMS (70)Ord Sec, GenDep(10)OrdDep (10)OrdAmmoComd(1)USAREURCommZ(6)OrdPG(10)OrdArsenals (10) exceptRaritanArsenal (100)ArmyRkt GMAgcy (30)FldComd, AFSWP (16)MAAG(West Germany) (2)MAAG(UnitedKingdom) (2)Unitsorg under fol TOE:9-227 (5)9-500 (5)9-510 (3){t u. S. GOVERNMENTPRINTINGOFFICE: 1959-480507AGO3863Aj, ran.. -ICDCD...CCICCICCI,=I ......I-.....:::IE...........'.-.>-Ii:....::cc:.a.....:::IEf,'( .