TECHNICAL MANUAL

opeRATION INSTRUCTIONSMAINTENANCE INSTRUCTIONS

EE730· 05·0 M1·010/4805·PO R·27SUNCLASSIFIED

RADIAC SETAN/PDR-27S

NSN 2Z 6665-01-080-4418

NUCLEAR RESEARCH CORPORATIONDenville Nuclear Division

2 Richwood PlaceDenville, New Jersey 07834

Each transmittal of this document outside of the Department of Defense must havea~proval of the issuing Service.

" • ...;-J.-

PUBLISHED UNDEf\:AUTHORITY OF: DEPARTMENT OF THE NAVYNAVAL ELECTRONIC SYSTEMS COMMAND

UNCLASSIFIED

INTERIM CHANGE T-l

UNCLASSIFIED

EE730-DS-OMI-OlOj4805-PDR-27S

INSTRUCTION SHEET

Interim Change T-l to Technical Manual for Radiac SetANjPDR-27S Publication No. EE730-DS-QlIU-OIOj4805-PDR-27S.

General Instructions

This interim change revises the manual to correcttypographical errors in the manual. This change doesnot supersede any other changes or corrections. It isin effect immediately upon receipt.

Insert this interim change in the manual immediatelyafter the front cover preceding the title page, priorchanges, or interim corrections in effect.

Special Instructions

1. Make the following pen-and-ink correction onthe pages listed below:

Page

3-13-13-33-43-65-35-7

5-11

5-11

5-115-19

5-19

6-9

Dated: 30May1981

Paragraph Line

3-1 63-2a (1) 2Fig. 3-2 13-2b 1Fig. 3-3 5WARNING 4Table 5-3 2Step 7Normal Col.Table 5-4 1Step 5Normal Col.Table 5-4 1Step 5Abnormal Col.CAUTION 2Fig. 5-2 1TP-2Fig. 5-2 1TP-IO/ll6-3c(3) 1

UNCLASSIFIED

ChangeFrom To

"690""690""690""690""690""690""690"

"690"

"690"

"690""690"

"690"

"690"

"710""710""710""710""710""710""710"

"710"

"710"

"710""710"

"710"

"710"

UNCLASSIFIED

IINTERIM CHANGE T-2 EE730-DS-OMIOlO/4B05-PDR-27S

INSTRUCTION SHEET

Interim Change T-2 to Te.chnicalManual for Radiac Set.AN/PDR-27S Publication No. EE730-DS-OMI-O.O/4B05-PDR-27S.

·General Instructions

This interim change revises the manual to correcttypographical errors in the manuaL, This change does notsupersede any other changes or corrections. It is ineffect immediately upon receipt.

Insert this interim change in the manual immediatelyafter the front cover preceding the title page, priorchanges, or interim corrections in effect.

c~al Instructions

1. Make the following pen-and-ink correction onthe page listed below:

ChangePage ParagraEh From To

6-9 6.3, c, (7) 40:!:_l 35:!:.1

6-9 .3, c, (B) Adjust R22 Adjust R22 tofor a ful it maximum CC\iscale (500 position (atmR/hr meter least 20 turnsreading). CCW) •

Dated 24 August 1981

UNCLASSIFIED

EE730·DS·OMI·010/480S·PDR·27S< • UNCLASSIFIED

TECHNICAL MANUAL

OPERATION INSTRUCTIONSMAINTENANCE INSTRUCTI<ONS

RADIAC SETAN/PDR-27S

NSN 2Z 6665-01-080-4418

NUCLEAR RESEARCH CORPORATION.Denville Nuclear Division

2 Richwood PlaceDenville, New Jersey 07834

Contracts: N00612-76-C-0227N00612-78-C-0095N00612-79-C-0331

. N00612-79-C-0501N00612-80-C-0839

Each transmittal of this document outside of the Department of Defense must haveapproval of the issuing Service.

PUBLISHED UNDER AUTHORITY OF: DEPARTMENT OF THE NAVYNAVAL ELECTRONIC SYSTEMS COMMAND

APPROVED: 24 SEPTEMBER, 1980UNCLASSIFIED

Warning EE730-DS-O:MI -OlO/4805-PDR-27S

.WARNING. :

Calibration of the Radiacmeter maybe undertaken only atan authorized radiac repair facility by qualified techniciansusing radioactive calibration sources •

•

a

List of Effective PagesEE730-DS-OMI -OlO/4805-PDR-27S

LISTOF EFFECTIVEPAGESf--1------------;NOTE Theportionof thetextallecled'is!ndlcal'9dbyaverucatune in the cutermargin

of tho page. Chan~esto mustrattoeeare Indicated by mlni:1J.turepointing hands.cnenaes 10 •.•.iring dia.grams are indicated by shaded ar.eas ",-

Dates of~ssue for original and changes pages are:Original _ O._24Sept., 1980

TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 78CONSISTING OF THE FOLLOWING:

PageNo.

• ChangeNo.

PageNo.

• ChangeNo.

Cover Page . . . 0Tltle .................•.......... 0a " OA ...............•....•.•....•... 0Record of Changes . • . . . . . . . . .. 0I.iv ..................•...•..•... 0H)·H ...................•..•... O1·8Blank .....•......•....•...... 02-1 ·2·4. .. . . . .. . . .. .. .. . . . . . .. ... 03.1.3.7 .......•......•........... 03·6Blank .....•......•......•.... a3.9-3-10 .............•........... 04.1.4-4. .. 051.5-15 05·16Blank.. . . . . . .. . .. . .. • . .. . . .. 05.17 .............•.........•.... 05-18Blank ........•......•.••.... 05-19 ...............•....•....... 05-20 Blank . . . ... , . . . . • .. .. ... 05-21 ..........•.•..•.•....••.... 05-22Blank .......•.........•.... , 06-1·6·9 ........•...........•.•... 06-10Blank. . . . . . . • . . • . . . • . . . .. . .. 07.1-7.17 .......•.•....•.•...... 0

• Zero In this column Indicates an original

A

Record of Changes EE730-DS-OMI -010/4805- PDR-27S

RECORD OF CHANGES

CHANGE TITLE OR BRlE F ENTEREDNO. DATE DESCRIPTION BY

"\/

Table of Contents EE730-DS-OMl-01 0/4805-PDR-27S

TABLE OF CONTENTS

Chapter/Para Page

1. GENERAL INFORMATION 1-1

1-1. INTRODUCTION.. 1-11-2. GENERAL DESCRIPTION 1-11-3. DESCRIPTION OF UNITS 1-1

a. Case CY-7779/PDR-27S • . . . 1-1b. Radiacmeter IM-238/PDR-27S . . 1-1c. Radiac Detector DT-613/PDR-27S 1-2d. Headset H-43B/U . . . . . 1-2e. Harness PIN A41973-1 • . . . . . . 1-3f. Spare Parts •..•.•..•..• 1-3

1-4. REFERENCEDATA • . • • . . . . . . . 1-31-5. EQUIPMENTACCESSORIESANDDOCUMENTS

SUPPLIED . . . . . . • . . . . . . . . . . . . • 1-51-6. EQUIPMENTANDPUBLICATIONSREQUffiED

BUTNOTSUPPLIED ••.•.....•.• 1-51-7. FIELDCHANGESANDFACTORYCHANGES 1-5

2. OPERATION 2-1

2-1. INTRODUCTION .2-2. CONTROLSANDINDICATORS2-3. OPERATINGPROCEDURES••.

a. Preparation for Use . . . . •b. To Measure GammaRadiationc. To Detect Beta Radiation

2-4. OPERATOR'8 CHECK . . .2-5. EMERGENCYOPERATION

3. FUNCTIONALDESCRIPTION. . .

s-t. FUNCTIONALOPERATION3-2. FUNCTIONALSECTIONS.

a. Power Supply . . . .b. Radiation Detectors .c. Computer Circuit , , .

"

2-12-12-12-12-32-42-42-4

3-1

3-13-13-13-33-3

i

EE730-DS-OMI -010/4805-PDR-27S

TABLE OF CONTENTS-Continued

Table of Contents

Chapter/Para Page

4. SCHEDULED MAINTENANCE .......•.... 4-14-1. INTRODUCTION................ 4-14-2. SCHEDULEDMAINTENANCEACTION INDEX 4-14-3. SPECIAL TOOLS. . . . . . . . 4-24-4. SPECIAL TEST EQUIPMENT 4-24-5. RADIOACTIVE TEST SAMPLE 4-2

5. TROUBLESHOOTING •........ 5~'1

5-1. TROUBLESHOOTING, GENERALa. Symptom Recognition . . . . .b. Symptom Elaboration • . . ..c. Listing Probable Faulty Functiond. Use of Test Points .

5-2. TROUBLESHOOTINGPROCEDURESa. Preliminary Check-General . . .b. Power Supply and Computer Circuit

5-15-15-15-15-15-25-25-3

6. CORRECTIVE MAINTENANCE 6-1

6-1.6-2.

INTRODUCTION •...REPAIR PROCEDURES

6-16-16-1

6-3.

a. Tube Replacement .b. Printed Circuit Board Removal and

Replacement. . . . . . . . . . • .c. Meter Replacement .d. Meter illumination Switch Replacemente. Range Switch Replacementf. Meter Lamp Replacement .....ADJUSTMENT ANDCALm RATION •.a. General .b. Equipment Required for Calibrationc. Pre-Alignment . .d. Source Calibration ._

6-46-46-66-66-76-76-76-76-76-9

7. PARTS LIST .

7-1. INTRODUCTION... .7-2. LIST OF MANUFACTURERS

7-1

7-17-1

ii

List of Illustrations EE730-DS-OMl-OI0/4805-PDR-27S

Figure

1-12-1

3-13-23-33-43-55-15-25-36-16-26-36-47-1

LIST OF ILLUSTRATIONS

Title Page

Radiac Set AN/PDR-27S Relationship of UnitsRadiacmeter IM-238/PDR-27S Top PanelControls ....•....

Functional Block DiagramPower Supply SchematicRadiation DetectorsComputer CircuitMonostable MultivibratorOverall SchematicTest Point Waveform . .Wiring Diagram . . . . . . . . • . . .Radiacmeter IM-238!PDR-27S Right Side •••Radiac Probe DT-613!PDR-27S Disassembled.Rear View of Top Panel . . . . • • • . .Radiacmeter IM-238!PDR-27S Left SideParts Location, Printed Wiring BoardAssembly 1A1

1-0

"

2-23-23-33-63-73-95-175-195-216-26-36-56-8

7-2 Parts Location7-177-18

LISTOF TABLES

Figure Title Page

1-1 Reference Data . . . . . . .1-2 EquipmentAccessories andDocumentSupplies4-1 ScheduledMaintenanceActionIndex4-2 Special Test Equipment •.....5-1 TroubleshootingIndex, Radiacmeter5-2 MaintenanceTurn-On Procedure5-3 Radiacmeter AN/PDR-27SSystem

TroubleshootingChart5-4 Power SupplyCircuit Trouble Analysis5-5 ComputerCircuit Trouble Analysis7-1 Radiac Set AN/PDR-27S. NSN

2Z 6665-01-080-4418Parts List7-2 List ofManufacturers .

1-31-64-14-35-25-4

5-65-95-12

7-17-15

Hi

EE 730-DS-OMI -010/4805-PDR-27S Safety Summary

SAFETY SUMMARY

The following are general. saiety precautions that are notrelated to any specific procedures and, therefore, do not appear else­where in .this publication. These are recommended precautions thatper-sonnel must understand and apply during many phases of operation ~and maintenance.

DO NOT SERVICE OR ADJUST ALONE

Under no circumstances should any person reach into ofenter the enclosure for the purpose of servicing or adjusting the equip­ment except in the presence of someone who is capable of rendering aid.

RESUSCITATION

Personnel working with or near high voltages should befamiliar with modern methods of resuscitation. Such information maybe obtained from the Bureau of Medicine and Surgery.

The following warning appears in the text in this volumeand is repeated here for emphasis.

I WARNING IHighvoltage is used in the operation of thisequipment. Severe shock may result ifpersonnel fail to observesafety precautions.Learn the areas containinghigh voltage in eachpiece of equipment. Be careful not to contacthigh voltage connections wheninstalling orworking on this equipment. Whenservicing,ground points of high potential.before touchingthem.

••

SUMMARYOF PRECAUTIONSCITEDINTEXT

Avoidcontact with the windowof the low range G-Mtube.It is fragile and easily damagedwhichmight necessitate replacementof the tube. See pages 1-3 and 6-2.

iv

EE730-DS-OMI -0l0/4805-PDR-27S General Information

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1-0

General Information EE730-DS-OMI -010/4805-PDR-27S

CHAPTER I

GENERAL INFORMATION

_ 1-1. INTRODUCTION. This technical manualis in effect upon receipt.Extracts from this publication may be made to facilitate the prepara­tion of other Department of Defense Publications. This manual coversonly the AN/PDR-27S, NSN2Z 6665-01-0~O-4418 manufactured undercontracts N00612-76-C-0227, N00612-78-C-0095, N00612-79-C-0331and N00612-79-C-0501. It does not apply to any of the earlier AN/PDR-27 sets.

•

1-2. GENERALDESCRIPTION.Radiac Set AN/PDR-27Sis a portable,battery operated radiation detector and indicator (figure 1-1) capableof detecting andmeasuring up to 500mR/hr of gamma radiation and candetect the presence of beta radiation. Radiacmeter IM-238/PDR-27Sis the main unit of the radiac set. The radiacmeter is equippedwith acarrying handle anddetachable shoulder harness. Radiac ProbeDT-613/PDR-27S, attached to the radiacmeter by a coiled cable, is atwo-compartment probe whichis stowedin the mountingwell in theradiacmeter case. The radiacmeter housingencloses an electronicchassis, an indicatingmeter, and dry-cell batteries. Case CY-7779/PDR-27Sis a lightweightcarrying case whichhouses the RadiacmeterIM-238/PDR-27S, Headset H-43B/U, Harness PiN A41973-1, sparetubes, and two copies of this technical manual.

~ 1-3. DESCRIPTIONOFUNITS. Radiac Set AN/PDR-27Sconsists ofthe units listed in Table 1-1.

a. Case CY-7779/PDR-27S. The carrying case houses all theother units of the radiac set. (figure 1-1). It is splashproof and is. equippedwith a carrying handle. The case is deep drawn aluminumand can readily be decontaminated. Compartments to carry a spareset ofbatteries as well as all the other componentsare provided in thecase.

b. RADIACMETERIM-238/PDR-27S. The radiacmeter includesa housingmade of twoaluminumcastings with a gasketed seam. Thetop casting, or panel, supports all of the electronic circuitry and in­cludes a separate sealed battery compartment. The bottom castingacts as a cover whichencloses the electronic circuitry and the batterycompartment.

1-1

EE730-DS-OMl-OI0/4805-PDR-27S General Information

Mounted on the panel is an indicating meter, a range switch,a push-button switch, and headset jack. Mounted to the underside ofthe panel (figure 6-4) is the printed circuit board containing theelectronic circuitry.

The indicating meter is placed behind a sealed plastic windowfor waterproofing. It has 5 movable scales which are mechanicallycoupled to the range switch so that the scale corresponding to the switchposition is presented.

The carrying handle provides space for stowing the detectorcable when the detector is placed into its mounting well.

The push-button switch controls the meter lamp.

c. RADIACPROBE DT-613/PDR-27S. The radiac detector isa probe consisting of a type JAN-5979 Geiger-Mueller Tube and a typeJAN-5980 Geiger-Mueller tube, each enclosed in its own cylindricalmetal housing (figure 1-1). The two housings are clamped togetherinto one unit. A movable metal shield normally covers the micawindow of the larger tube. When the shield is over the window, betaradiation is excluded from the tube. The shield can be swung asidewhen beta-plus gamma radiation readings are desired.

Since the mica window is only o. 0OO5-inchesthick,it is extremely fragile. Donot touch the windowunder any circumstances, as damage to the tubewillresult. Donot rely uponthe guard ring to protect themica window. The guard ring openingsare largeenoughso that sharp objects may pierce the window.

Electrical connectionsfor bothG-Mtubes are madeat theends of the housingswhere the shielded cables pass throughwater­proof packingglands to the tube electrodes. The probe cable is flexibleand kinkproofand is normally coiled in the space in the top of thehandle.

d. HEADSETH-43B/U. The headset provides the operator withaural indications of radiation intensity whenpluggedinto the jack on thepanel (figure2-1). The headset is designedto fit inside a battle helmet.

1-2

General Information EE730-DS-OMI -OlO/4805-PDR-27S

e. HARNESSPiN A41973-1. The shoulder harness, an adjust­able strap made of non-absorbent plastic, is used for carrying theradiacmeter during operation. Clip fasteners on each end of the strapsnap into holes in small projections on the radiacmeter panel (figure2-1).

f. SPARE PARTS. The field spares, consisting of one each ofthe G-M tubes are carried in the spare parts compartments (figure

~ 1-1) of the carrying case.

1-4. REFERENCE DATA. The reference data for the Radiac Set arelisted in Table 1-1.

Table 1-1. Reference Data

Item Description

..

NameplateData

Radiac Set

Radiacmeter

AN/PDR-27S RADlACSETSUPPLY: 3VDC

Manufactured ForNAVALELECTRONICSYSTEMSCOMMAND

IM-238/PDR-27S- RADIACMETER

SUPPLY: 3VDC

Aunit of Radiac Set AN/PDR-27SManufactured ForNAVALELECTRONICSYSTEMSCOMMAND

1-3

EE730-DS-OMI -010/4805-PDR-27S General Information

Table 1-1. Reference Data-Continued

Item Description

Case

Equipment Supplied

Dimensions and Weights

Operating Temperature

Operating Altitude

Power Requirements

Accuracy

Range Indication

Energy Range

Battery Check

Meter Light

CY-7779/PDR-27S CASE, RADIACSET

A unit Radiac Set AN/PDR-27SManufactured ForNAVAL ELECTRONIC SYSTEMSCOMMAND

See Table 1-2.

See Table 1-2.

_400 to +600C

Anyaltitude up to 50,000 feet

2 each internal BA-30 1-1/2 volt "D"Cell Batteries

± 20%from 10%of full scale on eachrange throughout entire operatingtemperature range.

Meter Type Indication Provided onFour Ranges:

0-0.5, 0-5, 0-50, 0-500 mR/hr.

Measures gamma radiation from 80keVto 2MeV. Detects beta radiationon 0-0. 5 and 0-5 mR/hr ranges.

Meter Indication of Battery conditionprovided.

Momentary switched meter lightprovided.

1-4

General Information EE730-DS-OMI -010/ 4B05-PDR-27S

1-5. EQUIPMENT ACCESSORIES ANDDOCUMENTS SUPPLIED.Table 1-2 lists the dimensions and weights of all the components ofRadiac Set AN/PDR-27S.

1-6. EQUIPMENT AND PUBLICATIONS REQUIR~D BUT NOTSUPPLIES. None.

1-7. FIELD CHANGES AND FACTORY CHANGES. None .

••

.•

1-5

EE730-DS-OMI -OlO/4805-PDR-27S General Information

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1-7 (1-8 blank)

Operation EE730-DS-OMI -010!4805-PDR-27S

CHAPTER 2

OPERATION

Ships furnished with a Ships Systems Manual (SSM)may finddetailed operating instructions for this system/equipment therein.When this occurs, the SSMtakes precedence over this manual unlessotherwise indicated.

2-1. INTRODUCTION. Radiacmeter AN/PDR-27S is used to measuregamma radiation up to an intensity of 500 mR/hr and to detect betaradiation. The radiacmeter consists primarily of regulated high andlow voltage power supplies, a mica-end window Gieger-Mueller (G-M)tube for low range (0-0.5 and 0-5 mR/hr) coverage and beta detection,a G-M tube (no mica Window)for high range (0-50, 0-500 mR-hr)coverage, ratemeter and indicating circuits which provides a meterreading that is proportional to the radiation field intensity irradiatingthe G-M tube detectors.

2-2. CONTROLSANDINDICATORS. Refer to Figure 2-1 which showsthe operating controls. A single six position selector switch turns theunit on, provides for battery (BAT) check and selects the 500 mR/hr,50 mR/hr, 5 mR/hr or 0.5 mR/hr range. There is a screw coverwhich, when removed, exposes the four calibration controls. These aremarked 500, 50, 5 and 0.5 indicating the range being switched. Alsolocated on the top panel is the BNC connector for the headset. Theoperator is permitted to handle only the operational controls; namely,the selector switch, the LIGHT switch, attach the headset and attachthe carrying strap.

• 2-3. OPERATINGPROCEDURES.

a. Preparation for use.

(1) Removeradiacmeter from case.

(2) Removeand connect headset if aural indications aredesired.

(3) Removethe battery cover by looseningthe two captivescrews holdingit downand insert batteries (BA-30, 1-1/2 volt D cells)

2-1

EE730-DS-OMl-OIO/4B05-PDR-27S Operation

EYE FOR CARRYINGSTRAP

METER ILLUMINATIONSWITCH 15.2 ANDSEAL BOOT IH I

METER IMI ANDMEnoR WINDOW IMP9

HEADSET CONNECTORIJ I HANDLE IMP7

RANGE SWITCH ISI

CALIBRATION -----­POTENTIOMETERSIR3,IR5, IR7 AND IRS BATTERY COVER IMP2

CAPTIVE SCREWS IMPII

PROBE ASSEMBLYOT-613/ PDR-27S

Figure 2-1. Radiacmeter IM-238/PDR-27STop Panel Controls

2-2•

Operation EE730-DS-OMI -010/ 4805-PDR-27S

into battery compartment according to polarity markings on the top ofthe front panel under the battery cover. Replace battery cover andtighten securely.

(4) Rotate selector switch to BAT position to check conditionof batteries. The meter should read within the area marked"BATTERY". If not, replace with fresh batteries.

(5) Attach clips on harness strap through holes in each end ofradiacmeter panel if shoulder carrying is desired. Adjust strap tocomfortable length.

b. To Measure Gamma Radiation.

(1) Rotate the range selector to the 500 position. If thereading is below 10%of full scale, rotate to the 50 range. If readingis below10%of full scale, rotate to the 5 position. If reading is againbelow10%of full scale, rotate to the O. 5 position.

(2) Listen for clicks in the headset or observe the meterreadingwhile approachingthe radioactive object or area. In a weakfield it is necessary to use the headset because the clicks can be heardclearly evenwhenthe movementof the meter pointer is very small.

(3) Turn the range switch to a lower (more sensitive) rangewheneverthe meter reading is less than 5 divisions: turn it to a higher(less sensitive) range if the meter pointer approaches the high endofthe scale.

(4) Whenusing the headset for searching for a radioactiveobject, start with the range switch at O. 5. If the clicks increase to asteady notsa, turn to a higher scale.

(5) Whenit is desired to locate a radioactive object or thecenter of a radioactive area, move the radiacmeter in the directionthat produces an increase in the meter reading or in the frequencyof the clicks in the headset. Continuemovingin this direction until thepoint of maximumradiation intensity is found.

(6) If the object or area to be investigated is relativelyinaccesstble, remove the radiac detector from its mountingwell andpass the detector probe back and forth over the area.

2-3

EE730-DS-OMI -010/4B05-PDR-27S Operation

(7) When the radiation from an object or area is extremelyweak, bring the detector probe within a few inches of the object inorder to obtain the largest possible indication on the meter or theloudest sound in the headset. A close approach is necessary becausethe radiation intensity decreases rapidly with distance.

c. To Detect Beta Radiation

(1) To observe the combined beta and gamma radiation of anobject, turn the range switch to O. 5 or 5, remove the radiac detectorfrom its mountingwell and swingopenthe beta shield on the end of thelarge cylinder of the probe. Point the exposedend of the probe at theobject andmove it, slowly, until a readable meter indicationisobtained. .

2-4. OPERATOR'SCHECK

a. If the equipmenthas been used continuouslyfor more than 60hours, check the conditionof the batteries in the radiacmeter by turningthe range switchto BAT. Whenthe meter pointer rests to the left ofthe center line, not in the area marked BATTERY,replace the batteriesas instructed in paragraph 2-3, a, (3).

b. Withthe range switch in the 0.5 position, the meter pointer mayoccasionallydeflect upscale slightly due to ambientbackgroundradia­tion and occasionally clicks may be heard from the headset. This isnormal and indicates that the unit is operating.

c. Stopthe equipmentby turning the range selector switch to OFF.Removethe harness and headset frorn the radiacmeter, place theradiac detector into its mountingwell, and stow items in the carryingcase.

2-5. EMERGENCYOPERATION

a. If one or more of the parts of Table 7-1, Whichis prefixed withNotes 1 & 2, is changed, the radiacmeter will probablybe out ofcalibration. However, even thoughthe radiacmeter may be inaccuratewith respect to absolute intensity, it will still be usable to indicaterelative intensity withinanyone scale position.

This means that it is possible to recognize in whichof twolocations the intensity is higher, even thoughthe actual intensities arein error. If readings are taken in the two locations on the same scalepOSition,the higher reading correctly represents the higher intensity.

2-4

Functional Description EE730-DS-OMI -0l0/4805-PDR-27S

CHAPTER 3

FUNCTIONALDESCRIPTION

3-1. FUNCTIONAr;OPERATION. With reference to the FunctionalBlock Diagram, Figure 3-1, the primary power source consisting oftwo series connected BA-3Q-(1-1/2 volts) batteries, provides oversixty hours of continuous instrument operation. A transistorized powersupply converts the three volts from the batteries into a regulated

a: +690volt G-Mtube anodevoltages and a ± 4. 5 volt outputfor thecomputer-indicating circuitry operation. Beta particles (onthe 0.5and the 5.0 rnR/hr ranges) and gamma rays on all ranges cause theGeiger tubes to produce voltage pulses whichare then fed through adifferentiating amplifier to a pulse generator followedby a meter drivecircuit. The pulse generator provides pulses to the headphonefor auralmonitoring and supplies a DC current, proportional to the averagepulse repetition frequency, to the indicating meter.

Power for all functionalblocks is obtained through the lowvoltage Power Supply. The regulated Power Supplycircuit assuresthat all operating voltages are maintained constant throughoutthe use­fullife of the batteries (battery life is in excess of 60 hours).

3-2. FUNCTIONALSECTIONS.

a. Power Supply

Refer to Figure 3-2, Power SupplySchematic. TransistorsQ3, Q4 and Transformer TI operate as a free running.saturatingoscillator that induces, by virtue of the transformer turns ratio,substantially larger ACvoltage across the secondary windings10-11and 7-8-9. TheACvoltage is converted to DCas follows:

(1) Winding10-11voltage quadrupler consrstmgof CR4toCR7and CI3 to CI6 for a +690volt output.

(2) Winding7-8-9 full wave rectifier consisting of CR9, CRIO,and CI9 for a +4.5 volt output.

(3) Winding7-8-9 full wave rectifier consisting of CR8, CRll,and CI8 for a -4. 5 volt output.

3-1

Functional Description EE730-DS-OMI -OlO/4B05-PDR-27S

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3-3

>II'!<t"·1

EE730-DS-OMI -010/ 4805-PDR-27S Functional Description

Voltage regulation is accomplished by sensing any change inthe + 4. 5volt outputby the divider string of R3l, R32, R33and CRl3,and applyingthis changeto an input gate of the operational amplifier Vl.Any.changewith respect to the 2.4 volt micro-current zener referencediode, CR12, results in an outputcurrent to the base of control FETQ2. The outputofQ2drives the regulator transistor Ql, which sup­plies the power for the oscillator. In general, for the same outputvoltage, the collector impedanceof Ql must be decreased as the bat­tery voltage decreases. All other outputs are stabilized to the regula­ted volt supplythrough the controlled oscillator transformer Tl. R32is the outputvoltage adjust and CR13corrects the operationalamplifieroutputfor zener reference variations over the full operatingtemperature range.

b. RadiationDetectors (Refer to Figure 3-3).

The 690volt power supplyprovides HVto the twoG-Mtubes,vi and V2. The contacts of the range switch are connectedto supplyHVto Vl only on the 0.5 mR/hr and 5.0 mR/hr ranges while V2isenergized at all times (onall four ranges).

Whenradiation causes either of the G-Mtubes to discharge,a negativevoltage pulse is generated across R2 or Rll, and coupledtothe pulse countingcircuit (computer)through C6or C7.

c. ComputerCircuit (Refer to Figure 3-4).

The pulse from the G-Mtube is coupledto the input of tran­sistor Q5. The amplifier Q5 is normally biased "on". A negativegoingpulse turns Q5off for the duration of the input pulse. CRl is aprotection diodethat protects the base of Q5from beingdamagedbylarge negative inputpulses. The positive pulse formed on the collectorofQ5turns the amplifier inverter transistor Q6 "on" for the durationof the input pulse. The negative pulse on the collector ofQ6 is differ­entiated by the networkof Cl2 and R15and this differentiated pulse isimpressed on the base of the switch transistor Q7. DiodeCR3is usedto clamp the positive part of the differentiated pulse to •5volts toprotect the base ofQ7 from being damaged.

Transistors Q8andQI0 form a monostablemultivibrator.The normal state of the monostablemultivibrator corresponds to fullconduction(saturation) ofQI0 by its base being connectedto the

3-4

Functional Description EE730-DS-OMI -OIO/4805-PDR-27S

positive 4. 5 volts DC supply through -oneof the following listed networks,depending on the setting of range switch SIB. The following lists theassociated timing capacitor used within each range.

Resistor TimingRange Network Capacitor

0.5 mR/hr R3, R4 C5

5.0 mR/hr R5, .R6 C4

50 mR/hr R7, R8 C3

500 mR/hr R9, RIO C2

Transistor Q8 is normally "off" since its base is returned toground through R26 and saturated transistor QI0. Transistor Q9 is anamplifier whose collector is connected to the meter MI through R23 andadjustable resistor R22. With Q8 being "off" in the normal state,there is no current to flow through the meter Ml. In this state themeter will indicate zero.

.•.

Whena negative goingpulse from the differentation networkarrives at the base ofQ7 (refer to Figure 3-5) transistor switchQ7turns on (saturates) and pulls one end of the timing capacitor C2, C3,C4, or C5, dependingon the setting of the range switch SIB, to ground.This causes a negative pulse at the base ofQIO, turning QIO "off".As the collector ofQIOgoes to +4.5volts, Q8 is turned onvia theresistor R26. Q8 saturates and holds the timing capacitor at groundwhileQ7turns off at the end of the negative inputpulse. The action ofQ7andQ8turning "on" causes current to flowthroughR20and R21.The voltage developedby the current in R20biases the transistor Q9"on" and current flows throughQ9, R23, R22and the meter Ml. Aftera time determined by the value of the timing capacitor and resistor net­work, the timing capacitor completes its discharge and begins to chargetoward the +4.5 volt DCsupplythrough the resistor network. Thiscauses a positive voltage at the base ofQIO, turning QI0 "on"(saturated). This causes the current to the base ofQ8to stop, turningQ8 "off", turning offQ9, which stops the current flowthrough theme­ter MI. The monostablemultivibrator has nowreturned to its"normal" state. Thus, each received pulse from the G-Mtubes hascaused a fixed current to flowthrough the meter for a fixed time deter­minedby the timing capacitor and resistor network. As longas this

3-5

EE730-DS-OMI -OlO/4805-PDR-27S

3-6

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Functional Description

---------

EE730-DS-OMI-010/ 4805-PDR-27S

I1

Computer Circuit

3-7 (3-8 blank)

Functional Description EE730-DS-OMI -OlO/4805-PDR-27S

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3-9

EE730-DS-OMl-OIO/4805-PDR-27S Functional Description

fixed conduction time interval is small compared to the average inter­val between received pulses, the average current which flows throughthe meter will be directly proportional to the average repetition rate ofthe received pulses and the meter's indication will be linear. Capaci­tor Cl smooths out the current pulses to the meter so that rapid fluctu­ations are suppressed. Diode CR15 protects the meter against damagefrom over voltage. The pulses at the collector of QIO are fed to theheadphone jack Jl via R25 for aural monitoring.

..

3-10

Scheduled Maintenance EE730-DS-OMl-010/4805-PDR-27S

CHAPTER 4

SCHEDULED MAINTENANCE

The scheduled maintenance instructions in this manual wereintended to duplicate those furnished in the Planned Maintenance System(PMS). In case of conflict, the PMS documentation takes precedence.Such conflicts should be reported immediately in accordance with themaintenance procedures for this manual.

4-1. INTRODUCTION. Scheduled maintenance is that maintenancerequired to be performed on the equipment at regular scheduled inter­vals whether or not the equipment is in use. The purpose of scheduledor preventative maintenance is to keep the equipment in good workingorder and to insure proper performance when the equipment is needed.

4-2. SCHEDULED MAINTENANCEACTION INDEX. The maintenancechecks and procedures of Table 4-1 shall be performed at the intervalsindicated unless the intervals are modified by the Officer-in-Charge.

Table 4-1. Scheduled Maintenance Action Index

Maintenance Action

Follow proceduresin paragraph 2- 3and 2-4

Interval Reference

Monthly (M) Check that the radiacmeter coverscrews and calibration accessscrews are seated formly.

Monthly (M) Operational checks

NOTE: No special equipment or special tools are required to performscheduled maintenance.

4-1

EE730-DS-OMI -OlO/4805-PDR-27S Scheduled Maintenance

4-3. SPECIAL TOOLS. There are no special tools required tooperate, maintain or disassemble the AN/PDR-27S Radiac Set. A"pencil" soldering iron will be useful as will be soldered wick forcomponent removal. Care should be taken when soldering to applyminimum heat and to avoid burning nearby leads and components. Aheat sink (such as long nose pliers, alligator clips, etc.,) is requiredwhen soldering semiconductors. Disturb lead dressing as little aspossible. Take care to keep foreign particles (dust, smoke, metalfilings, solder, etc.) out of the radiacmeter during repair.

4-4. SPECIAL TEST EQUIPMENT. Although there is no special testequipment required, any repair and calibration depot would havesufficient electronic instrumentation to facilitate electronic trouble­shooting and repair. Table 4-2 lists a grouping of some of the pre­ferred test equipment. Only one of each category is needed i. e., onescope with two probes, one counter, one electrostatic voltmeter or one

; high impedance precision voltmeter, and one low voltage voltmeter.

4-5. RADIOACTIVETEST SAMPLE. A low level radioactive testsource (not supplied) such as the :MX-7338as previously provided withthe AN/PDR-27R series radiac sets or some other source of radiationis necessary for checking operability on all ranges. Known sources of.gamma radiation such as that derived from the AN/UDM-l or AN/UDM­lA calibrators are required for equipment calibration.

4-2

Scheduled Maintenance EE730-DS-OMI -OlO/4805-PDR-27S

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4-3

EE730-DS-OMI -010/4805-PDR-27S

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Scheduled Maintenance

Troubleshooting EE730-DS-OMI -010/ 4B05-PDR-27S

CHAPTER 5

TROUBLESHOOTING

5-1. TROUBLESHOOTING,GENERAL. Troubleshooting of the radiac­meter will be easier if an orderly procedure is used. Procedures inthis section are intended to help localize trouble in defective componentsquickly.

a. Symptom Recognition. This is the first step in the trouble­shooting procedure and is based on a complete knowledge and under­standing of equipment operating characteristics. All equipment troublesare not the direct result of component failure. Therefore, trouble inan equipment is not always easy to recognize since all conditions of lessthan peak performance are not always apparent. This type of equip­ment trouble is usually discovered while accomplishing preventivemaintenance procedures. It is important that the" not so apparent' ,troubles, as well as the apparent troubles, be recognized. See Table5-2 for Maintenance Turn-on Procedures.

b. Symptom Elaboration. After an equipment trouble has been, , recognized' , , all available aids designed into the equipment shouldbe used to further elaborate on the original trouble symptom. Use offront panel controls and other built-in indicating or testing aids shouldprovide better identification of the original trouble symptom. Alsochecking or otherwise manipulating the operating controls may eliminatethe trouble.

c. Listing Probable Faulty Function. The next step in logicaltroubleshooting is to formulate a number of ' 'logical choices" as to thecause and likely location (functional section) of the trouble. The logicalchoices are mental decisions which are based on knowledge of theequipment operation, a full identification of the trouble symptom, andinformation contained in this manual. The overall functional descrip­tion and its associated block diagram should be referred to whenselecting possible faulty functional sections. See Figure 3-1 andTable 5-1.

d. Use of Test Points. Troubleshooting of the AN!PDR-27S,NSN 2Z.6665-01-080-4418 has been greatly simplified by display ofmany test points. The faulty circuit can be rapidly determined bycomparing the observed waveform against the normal pattern shown inFigure 5-2.

5-1

EE730-DS-OMI-OIO/4805-PDR-27S Troubleshooting

Table 5-1. Troubleshooting Index, RadiacmeterIM-238/PDR-27S

Trouble- Trouble- Functional Alignment/Functional shooting shooting Description Adjust

Area Paragraph Table Paragraph Paragraph

Overall 3-1 5-3 3-1

Power Supply 5-2, b.{l) 5-4 3-2,a Table 5-4

Radiation 6-2,a 5-3 3-2,b Par 6-3, dDetectors

Computer 5-2,b.(1) 5-5 3-2, c Par 6-3, cCircuit

5-2. TROUBLESHOOTINGPROCEDURES

a. Preliminary Check-Gener-al, Before proceeding with anyelectrical tests, the followtng mechanical inspection procedure shouldbe followed:

(1) The instrument housing should be examined for anymechanical damage.

(2) The range switch should be turned to its various positionsto see that the switch knob and meter scales index properly.

(3) The meter should be examined. Observe the meter needleto see that it is not bent. Observe whether the needle is mechanicallyzeroed. (Meter zeroing may be accomplished by removing the radiac­meter from its housing and turning the meter zero adjusting screwlocated on the rear of Ml. (See Figure 6-1). A clearance hole is pro­vided in the printed circuit board for this purpose.

(4) The battery cover should be removed, and the batterycontacts inspected for cleanliness. Check to insure that the batterieshave been properly installed and that the battery condition (BAT onselector switch) indicates satisfactorily.

5-2

Troubleshooting EE730-DS-OMI-OIO/4805-PDR-27S

(5) The instrument housing should now be opened by looseningthe six captive screws holding the housing and cover together. Visuallyexamine the internal assembly.

(6) Turn the range switch S1 and observe the operation of theswitch to see that it appears to be working satisfactorily.

WARNING aWithbatteries installed, advancingtherange swltch, even to BAT, puts theradiacmeter in operation. Highvolt­age (690volts), is present at manyplaces on the printedwiring board andalso at VI and V2anode. Exerciseextreme cautionwhenworkingon theexposedchassis or probes.

Anytroubles foundin the above steps shouldbe correctedbefore proceedingany further. The instrument shouldbe prepared foroperation and the procedure followedas indicated in Table 5-2.References shouldbe made to Figure 2-1.

b. Power Supplyand ComputerCircuit.

(1) Preliminary check.

After determining from Steps 7, and 8 of Table 5-3 that thepower supplyis operating improperly, proceed as follows: Visuallyinspect all connectionsand printedwiring for breaks.

(2) Use of TroubleshootingCharts..

Followthe procedures as indicated in Tables 5-4 and 5-5.References shouldbe made to Figure 3-1 through 3-5 and Paragraphs3-2,a throughc.

All voltagemeasurements are madewith selector switchin BATposition.

5-3

EE730-DS-OMI -01O/4805-PDR-27S Troubleshooting

Table 5-2. Maintenance Turn -On Procedure

Step Observe Reference

1. PreliminaryProcedure

a. Examine instru-ment case formechanicaldamage.

b. Turn range Proper switch indexing Par. 2-2;switch to its 5-2,a.(2)various positions

c. Examine meter If meter needle is bent. Par. 5-2,

If meter mechanicala. (3)

zero is not properlyset.

d. Remove battery Cleanliness of battery Par. 5-2,cover contacts. a. (4);

Proper installation ofbatteries.

2. Set range switch in Meter should indicate Par. 2-3,BAT position within the area marked a. (4);

BATTERY.

3. Set range switch in Meter should indicate Par. 2-3, b."500" position. zero.

4. Set range switch in Meter should indicate Par. 2-3, h, ;"50" position. zero.

5-4

Troubleshooting EE730-DS-OMI-OIO/4805-PDR-27S

Table 5-2. Maintenance Tur-n-On Procedure-Continued

Step ReferenceObserve

5. Set range switch in"5" position.

6. Set range switch in"0.5" position.

Meter could indicateslight background.

Meter should indicateslight upscale indica­tions due to backgroundradiation .

Par. 2-3, b. ;

Par. 2-3,b.;

..

5-5

EE730-DS-OMI -OlO/4805-PDR-27S Troubleshooting

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5-6

Troubleshooting EE730-DS-OMI-OIO/4805-PDR-27S

5-7

EE730-DS-OMI -OlO/4805-PDR-27S Troubleshooting

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5-8

Troubleshooting EE730-DS-OMI -OlO/4805-PDR-27S

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5-9

EE730-DS-OMI-OIOj4805-PDR-27S Troubleshooting

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5-10

Troubleshooting EE730-DS-OMI-OIO/4805-PDR-27S

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5-11

EE730-DS-OMI -OlO/4805-PDR-27S Troubleshooting

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5-12

Troubleshooting EE730-DS-OMI -010/4805-PDR-27S

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5-13

EE730-DS-OMI -010/4805- PDR-27S Troubleshooting

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5-14

Troubleshooting EE730-DS-OMl-OlO/4B05-PDR-27S

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5-15 (5-16 blank)

RefDes

BTIBT2lAlClIAlC2IAIC3lAlC4lAlC5lAlC6lAlC7lAlC8lAlC9lAlCIOlAlCHlAlCl2lAlC13lAlC14lAlC15lAIC16lAlCl7lAlC18lAlC19lAlC20lAlC21lAlC22lAlCRllAlCR2lAICR3

GENERAL NOTESI

RefZone. Des3A lAICR43A IAICR53C IAICR63D IAlCR73D lAlCRS3D lAICR93D lAlCRlO3B lAlCRll3B lAlCRl23B IAlCR133C lAlCR153C lJl3C lJ22D ILl2C lMl2C lAlQl2C lAlQ22C lAlQ3lC IAIQ42B lAlQ52B lAlQ6lB lAlQ71D lAlQ8lB lAlQ93G lAlQlO3C lRl2D lR2

ZoneRefDes

2C2C2C2C2B2B2B2B2BlB2DIC3D3B2C3B3B3C3C3D3D2D2D2D2D4C3B

lR3lR4lR5lR6lR7IRSlR9IRIO2A3RlllAlRlllAIRl2IA1R13IAlRl4lAlR15IAlR16lA1R17lAlR18lAIRl9lA1R20lAlR21lA1R22lAlR23lA1R24lAlR25lAlR26IA1R27IAlR28

IZone

3D3C3D3C3D3C3D3C3B3B3D3D3D3D3D3C3C3C2D2D1D1D1D1D2ClClC

RefDes

lAlR29lAlR30lAlR31lAlR32lAlR33lAlR34lAlR35lAlR36lAlR37lSllS2lAlTllAlTPllAlTP2lAlTP3lAlTP4lAlTP5lAlTP6lA1TP7lAlTP8lAlTP9lAlTPlOlA1TPlllAlDl2Vl2V2

Zone

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• 'fPI

Troubleshooting EE730-DS-OMI -010/ 480E·-):JDR-278

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5-17 (5-18 blank)

Troubleshooting EE730-DS- OMI-010/4B05-PDR-27S

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5-19 (5-20 blank)

Troubleshooting EE730-DS-OMI -OlO/4805-PDR-27S

4 I 3 + 2 I 1REVISIONS

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5-21 (5-22 blank)I

Corrective Maintenance EE730-DS-OMI -010 -4805-PDR-27S

CHAPTER 6

CORRECTIVE MAINTENANCE

6-1. INTRODUCTION. Radiacmeter AN/PDR-27S has been designedfor ease of maintenance. No tools other than the usual service toolsare required. A pencil or gun type soldering iron will be useful, par­ticularly the type that can accommodate an in line desoldering tip whenremoving integrated circuits. Care should be taken when soldering toapply minimum heat to avoid burning nearby leads and components. Aheat sink (such as long nose pliers, alligator clips, etc.) is requiredwhen soldering semiconductors. Disturb lead dressing as little as pos­sible. Take care to keep foreign particles (duct, smoke, metaifillings,solder, etc.) out of the radiacmeter during repair. Be sure to removethe batteries to preclude any possibility of energizing the set duringrepair. Refer to WARNINGof paragraph 5-2, a. (6).

6-2. REPAIR PROCEDURES

a. Tube Replacement. Both tubes are housed in the probe. VI isa type 5979 Geiger-Mueller tube and is the low range (0.5 and 5 mR/hr)detector. V2 is a type 5980 Geiger Mueller tube and is the high range(50 and 500 mR/hr) detector. Refer to Figure 6-2.

The cathode end of VI has a thin and del­icate mica window. Do not allow any sharppointed object to touch the mica window.

(1) To replace VI unscrew both the window cover assembly2A2MP3I and the rear (cable end) knurled nut 2A3MP45.

(2) USing fingers or long nose pliers pull off anode contact2A3MP49 and push out tube.

(3) Remove "0" ring seal 2A2MP33 and install on new tube.Assemble in reverse order.

6-1

EE730-DS-OMI -OlO/4B05-PDR-27S Corrective Maintenance

JR2

METERZEROACCESSHOLE

JMPI5

Figure 6-1. Radiacmete r IM-238/PDR-27S Right Side

6-2

IS J a:

IRI

JWI

Corrective Maintenance EE730-DS-OMI -OlO/4805-PDR-27S

2A3WI

2A3~4Ci

31

2A2AI

2A3MP!53

Figure 6-2. Radiac Probe DT-613/PDR-27S Disassembled

6-3

EE730-DS-OMI -OlO/4805-PDR-27S Corrective Maintenance

(4) To replace V2, unscrew the small knurled nut 2A3MP50and pull tube and mounting board out of probe.

(5) Replace V2 and reinsert board assembly 2A3Al in probemaking sure that board is positioned toward large probe whilereassembling.

b. Printed Circuit Board Removal and Replacement. See Figure6-3.

(1) Unscrew 6 captive screws on top panel and remove panelfrom housing. o:t

(2) Remove four 6/32 screws and hardware holding P. C.board lAl to radiacmeter. The two screws attaching board to batterycompartment are shorter than the front two and must be replaced incorrect order.

(3) Remove connector, reconnect new board assembly andreassemble in reverse order.

c. Meter Replacement. See Figure 6-3.

(1) Unscrew and remove the calibration port cover from thetop panel.

(2) Remove the P. C. board as outlined in paragraph 6-2, b.

(3) Loosen 4-40 screw holding clamp on meter flag shaft andremove clamp from meter.

(4) Remove two hex stand-offs and hardware from front ofmeter bracket.

(5) Remove two 6-32 screws and hardware from rear ofmeter bracket.

(6) Unsolder meter wires, note color code and polarity.

(7) Pivot meter bracket to the side permitting access to thefour 6-32 meter mounting screws. Remove four 6-32 screws andhardware.

(8) Remove and install new meter in reverse order.

6-4

Corrective Maintenance EE730-DS-OMI -010/ 4805-PRD-27S

IAI

Figure 6-3. Rear View of Top Panel

6-5

EE730-DS-OMI -0l0/4805-PDR-27S Corrective Maintenance

(9) Place meter clamp over flag shaft and turn range switchto 50 position.

(10) Using long nose pliers, rotate flag shaft to center white10-50 scale. Tighten 4-40 clamp screw.

(11) Check all ranges for scale alignment and readjust clampposition if necessary"

d. Meter Illumination Switch Replacement. See Figure 6-3.

(1) Remove meter mounting bracket as outlined in paragraph6-2, c, (1) through (5).

(2) Place common bladed screwdriver down hole marked S2and in between terminals of S2 to prevent rotation as the boot hex nut,1H1 is unscrewed from the top panel handle mount (3/8 spintite),

(3) Pull switch out of handle mount, cut or unsolder the twowires, install new shrink tubing over the wires, resolder to new switchterminals (no polarity), slip tubing over terminals and using heat ofsoldering iron shrink to terminal.

(4) Push switch into mounting hole using screwdriver betweenthe terminals and screw on boot lHl.

(5) Reassemble meter mounting"bracket as outlined inparagraph 6-2, c. (8) through (11).

e. Range Switch Replacement. See Figure 6-3.

(1) Remove P. C. Board assembly 1Al as outlined inparagraph 6-2, b.

(2) Loosen 4-40 clamp linkage screw on rear of switch shaft.Remove clamp from shaft.

(3) Loosen two 4-40 set screws in knob using a .050 allenwrench. Remove knob.

spintite.(4) Remove nut and hardware from switch shaft using 1/2"

6-6

Corrective Maintenance EE730-DS-OMI -010!4805-PDR-27S

(5) Identify each wire and terminal while unsoldering. Re­place IRI and 1R2 on new switch, solder wires and install in panel withnon-rotational tab properly seated. Fasten switch and knob. Set screwin rear of knob must run into flat on switch shaft.

(6) Place meter mechanism clamp over switch shaft and turnswitch to 50 position.

(7) Rotate meter flag until white 10-50 scale is centered.Tighten 4-40 clamp screw on switch shaft.

(8) Check all ranges for scale alignment and readjust clampposition if necessary.

f. Meter Lamp Replacement. See Figure 6-3.

(1) Remove radiacmeter from housing.

(2) Using fingers or pliers pivot lamp L1 contact plate 1MP18toward front of unit. Replace lamp.

6-3. ADJUSTMENTANDCALIBRATION

a. General. Radiacmeter AN!PDR-27S is calibrated at time ofmanufacture. Recalibration is usually not required unless certaincritical components are replaced or there is evidence that the fourranges do not track each other properly (see Table 7-1 Notes 1 and 2for list of critical components).

b. Equipment Required fo"rCalibration. The special test equip­ment outlined in Table 4- 2 IS adequate for complete equipmentcalibration or troubleshooting.

(1) A stand and equipment to adequately position and hold theradiacmeter and probe in a fixed relation to the radiation source used.

(2) A small screwdriver.

c. Pre-alignment. If electronic repair or replacement has beenperformed on the radiacmeter, basic adjustments or alignment must becertified before attempting source calibration. Proceed as follows:

(1) Withdraw radiacmeter from its housing. Removecalibration cover.

6-7

EE730-DS-OMI -OlO,/4805-PDR-27S Corrective Maintenance

IMI

,______ IHI,

152(HIDDEN)

IMPI?,•• IJI

(HIDDEN)

Figure 6-4. Radiacmeter IM-238/PDR-27S Left Side

6-8

.'e

Corrective Maintenance EE730-DS-OMI -010/4805-PDR-27S

(2) Check batteries, replace if necessary and turn rangeswitch to 500.

(3) Adjust R32 for 690.±5 volts at TP-2.

(4) Check low voltage for 4.3-4.8 volts at TP-l.

(5) Connect a pulse generator (high side) to TP-7 through a0.01 mfd (100 volt minimum) capacitor. Set generator for 1080 + 5 pps,negative going, 5 to 10volts amplitude. -

(6) Connectan oscilloscope probe (either 1:1 or 10:1) toTP-9.

(7) Adjust lR9 to provide a pulse width of 40 + 1micro­secondat TP-l.

(8) AdjustR22for a full scale (500mR/hr meter reading).

d. Source Calibration. Refer to standard Calibration Procedurefor the AN!PDR-27Radiac Series contained in VolumeL, NAVELEX0967-LP-588-6010.

6-9 (6-10blank)

Parts List EE730-DS-OMI -010/ 4805-PDR-27S

CHAPTER 7

PARTS LIST

7-1. INTRODUCTI0N. This parts list is applicable for Radiac SetAN/PDR-27S, NSN2Z 6665-01-080-4418 only. Reference designationshave been assigned to identify all maintenance parts of the equipment.The first digit in the reference designation is one (1) for all parts in the-radiacmeter less the coil cord and probe assembly whose associatedparts are designated two (2). Those parts which are part of the printedcircuit board assembly are designated lAl. Following the initialsub-assembly designation a letter or letters describing the type of part(BT for Battery, C for Capacitor, V for tube,) etc. The last numberindicates which of a group of similar parts is being designated. Exam­ple 1AC3 is capacitor C3 located on the printed circuit board. Thename and description of the part provides a more complete descriptionof the part including the supplier and part number where applicable.The figure and Item Numbers indicate the figure number where the partis shown and the call out used to designate the part on that figure.Table 7-1 is the complete Parts List.

••

7-2. LIST OF MANUFACTURERS. Table 7-2 lists the manufacturersof all parts. The first column includes the abbreviations used in Table7-1 to indicate the manufacturer.· The second and third columns showthe full name and address of each manufacturer.

Table 7-1. Maintenance Parts List

RefDesig

Fig.No.

(Item)Notes Name And Description

RADIACSET AN/PDR-27S measures 1-1Gamma, detects Beta, 4 ranges 0-500,50, 5 and O. 5 mR/hr, per MIL-R- 24061;mfr 06442, Dwg. C21380

CASE, RADIACSET CY-7779/PDR-27S; 1-1mfr 06442, Dwg 21425

7-1

EE730-DS-OMI -OlO/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Parts List

RefDesig Notes

2

LAMP. INCANDESCENT, mfr. 08806.part no. 338

Fig.No.

(Item)

lHT1 1-1

IMP1

2V1

1 & 2

1BT1thrulBT2

1H1

1J1

1J2

ILl

7-2

CONNECTOR, P, C. Board. 15 pin; mfr 6-371785, part no. 250-15-30-171, modified (J2)by mfr. 06442, Dwg. A21393

Name And Description

HEADSET; MIL type H43B/U

CARRYINGSTRAP; mfr. 06442, Dwg.A41973-1

TUBE, G-M, end window, low range;MIL type JAN5979 (spare)

2 TUBE, G-M, high range; MIL typeJAN5980 (spare)

RADIACMETER IM-238/PDR-27S andProbe DT-613/PDR-27S; mfr 06442,Dwg. 21382

BATTERY, Dry Cell, 1. 5 volt; MILtype BA-30

BOOT, dust and moisture seal, SiliconeRubber; mfr. 97539, part no. N5045

CONNECTOR, BNC series, MIL typeM39012/21-0001

1-1

1-1

1-1

1-1

7-2(BTl)(BT2)

2-1(HI)

2-1(Jl)

6-3(Ll)

Parts List EE730-DS-OMI -010/ 4805-PDl{-27S

Table 7-1. Maintenance Parts List - Continued

Fig.Ref No.Desig Notes Name And Description (Item)

IMI 2 METER, 50 Microamperes DC Full 6-4Scale Deflection ;1-2%,Scale Changing. (Ml)Five Scales; OFF BATTERY.

• 0-500 mR/h, 0-50 mR/h, 0-5 mR/h,0-0.5 mR/hr, MIL type MIL-M-10304/18A type MR 36M201 Spec. R.Modified by mfr. 06442 dwg. 21385

(Attaching Parts)

(4) SCREW, MACHINE-PAN HEAD,CROSS-RECESSED, CRES; MS-51957-31, 6-32 thd., UNC-2A; 5/8 in. 19.

(4) WASHER, LOCK, SPLIT, HELICAL,LIGHT SERIES; MS-35338-136, .151 inill, .239 in. OD.

(4) WASHER, FLAT, METAL, ROUND;MS-15795-805, .156 in. ID, .312 in. OD,.048 in. THK, No 6 size

(4) NUT, PLAIN-HEX; MS-35649-264,6-32 UNC-2A, .312 in. across flats,.. .361 in. across corners, .114 in. THK.

IMP2 BATTERY COVER ASSY; mfr. 06442, 2-1part no. B21392 (MP-2)

IMP3 GASKET, BATTERY COVER; mfr. 7"':206442, part no. 41974 (MP-3)

IMP4 SCREW CAPTIVE; mfr. 06442, part 7-2no. A21419-2 (MP-4)

7-3

EE730-DS-OMI -0l0/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Parts List

RefDesig Notes Name And Description

Fig.No.Item)

IMP5

IMP6

IMP7

IMP8

IMP9

IMPIO

IMPll

IMP12

IMP13

1MP14

1MP15

7-4

WINDOW, METER, PLASTIC ACRYLIC; 2-1per MIL-P-5425B; 1/16" THK, mfr. (MP-9)06442, part no. A41346

"0" RING, PANEL; MIL type MS9021- 6-3168 (MP-10)

SCREW, CAPTIVE; mfr. 06442, part 2-1no. A21419-1 (MP-ll)

CLAMP, SWITCH LINKAGE; mfr.06442, part no. A21319

ROD, SWITCH LINKAGE; mfr. 06442,part no. A21320

HANDLE; mfr. 06442, part no. B21395

KNOB, RANGE SELECTOR; MIL typeMS 91528-IK2B

COVER, Potentiometer; mfr. 06442,part no. 21317

COVER, Potentiometer; "0" Ring,MIL type MS9021-0.23

COVER, Potentiometer; "0" Ring MILtype MS9021-006

PANEL MOUNTINGBRACKETASSEMBLY; mfr. 06442, part no.21385

6-3(MP-5)

6-3(MP-6)

6-4(MP-7)

7-2(MP-8)

7-2(MP12)

7-2(MPI3)

7-2(MP14)

6-1(MP15)

Parts List EE730-DS-OMI -OlO/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

RefDesig Notes Name And Description

Fig.No.Item)

1MP16

lMP17•

IMPl8

lRl

lR2

lR3

1R4

1R5

1R6

1R7

1R8

2

2

2

CONTACT, LAMP; mfr 06442, part no. 6-3A21397 (MP18)

RESISTOR, FIXED, COMPOSITION; 6-175k ohms, ,:!-lO%,1/4 w, MIL type (Rl)RCR07G753KM

RESISTOR, FIXED, COMPOSITION; 6-11M ohms, t10%, 1/4 w, MIL type (R2)RCR07Gl05KM

RESISTOR, VARIABLE, COMPOSITION; 2-1lOOkohms, +10%, 1/2 w, O.5 mR/hr (R3)CAL adjust, -MIL type RV6NAYSI04A

CASE, BOTTOM; mfr. 06442, part no.C21386

CAP, CONNECTOR; MIL typeCWI23A/U

RESISTOR, FIXED, COMPOSITION;47k ohms, .±10%, 1/4 w, MIL typeRCR07G473KM

Same as 1R3, 5 mR/hr CAL adjust

Same as lR4

Same as lR3, 50 mR/hr CAL adjust

Same as lR4

7-2(MPI6)

2-1(MPI7)

5-3(R4)

2-1(R5)

5-3(R6)

2-1(R7)

5-3(R8)

7-5

EE730-DS-OMI -OI0/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Parts List

RefDesig Notes Name And Description

Fig.No.Item)

1R9

1R10

IS1

lS2

lWl

lAl

7-6

2 Same as IRa, 500 mR/hr CAL adjust

Same as 1R4

SWITCH, RillARY; 2 section, 5 poles,6 position 30 degree indexing, styleSR02S30B1MPC; mfr. 06442, part no.D21377

SWITCH, PUSH, MOMENTARY, NO;mfr. 81073, part no. 30-1

HAF.NESS, WIRING; mfr. 06442, partno. C21389

PRINTED CIRCUIT BOARD ASSEMBLY;mfr. 06442, part no. D21436.

(ATTACHINGHARDWARE)

(2) SCREW, MACHINE - PAN HEAD,CROSS-RECESSED, CRES; MS51957-27,6-32 thd., UNC-2A, 5/16" long

(2) SCREW, MACHINE - PAN HEAD,CROSS-RECESSED, CRES; MS51957-26,6-32 thd., UNC-2A, 4" long

(4) WASHER, FLAT-METAL, ROUND,CRES; MSI5795-805, . 156 I. D. ,.312 O. D., .048 thk.', NO.6 size

(4) WASHER, LOCK, SPLIT, CRES;MS35338-136, .151 1.D., .239 O. D.,.031 thk., NO.6 size

2-1(R9)

5-3(RIO)

2-1(SI)

2-1(S2)

6-1WI)

6-4(IAl)

Parts List EE730-DS-OMI -010/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Fig.Ref No.Desig Notes Name And Description Item)

• 1A1Cl CAPACITOR, FIXED ELECTROLYTIC; 7-11500MF, -10, +75%, 7VDCW, MILtype (C1)M39018/03-0603

• 1AIC2 2 CAPACITOR, FIXED, MICA; 560PF, 7-1.± 5%, 200VDCW, MIL type (C2)CMR06F56lFPDL

1AIC3 2 CAPACITOR, FIXED, MYLAR; 5600PF, 7-1.± 5%, 50VDCW, MIL type (C3)CQR07A1QA562JL3

1A1C4 2 CAPACITOR, FIXED, MYLAR; 2200PF, 7-1+ 5%, 100VDCW, MIL type (C4)"CQR07AlQB222J3L

lAlC5 2 CAPACITOR, FIXED, MYLAR; 7-122,000PF, .± 5%, 100VDCW, MIL type (C5)CQR7AIQB223J3L

lAlC6 CAPACITOR FIXED, CERAMIC; 7-1

• 220PF, + 10%, 1 KVDCW. MIL type (C6)CK60AX22lK

lAlC7 CAPACITOR, FIXED, CERAMIC; 22PF. 7-1•• .± 10%, 1KVDCW. MILtype (C7)

CK60BX220K

1AlC8 CAPACITOR, FIXED, ELECTROLYTIC; 7-1+ 20%, 330MF, 6VDCW, MIL type (C8)M39003/01-2252

lA1C9 CAPACITOR. FIXED, CERAMIC; 7-1thru .047MF, + 20%, 200VDCW, MIL type (C9)lA1CI0 M39014/01-1428 (CI0)

7-7

EE730-DS-OMI -OlO/4805-PDR-27S Paris List

Table 7-1. Maintenance Parts List - Continued¥

Fig.Ref No.Desig Notes Name And Description Item)

lAlCll CAPACITOR FIXED, CERAMIC; 7-1.01MF, + 20%, 200VDCW, MIL type (Cll)M39014/01-14l6

1:1lAIC12 CAPACITOR, FIXED, CERAMIC; 7-1

lOOOPF, + 20%, 200VDCW, MIL type (C12)M39014/0i/1398

IA1C13 CAPACITOR FIXED, CERAMIC; 7-1thru . 01MF, ..:!: 20%, 1KVDCW, MIL type (C13-lA1Cl7 CK63AW103M C17)

1A1C18 CAPACITOR~ FIXED, ELECTROLYTIC; 7-1100MF, + 20o, 10VDCW, MIL type (C18)M39003/01-2262

1AlC19 CAPACITOR~ FIXED, ELECTROLYTIC, 7-1220MF, + 20 0, 10VDCW, MIL type (C19)M39003/01-2266

1A1C20 CAPACITOR, FIXED, CERAMIC, 100PF, 7-1+ 20%, 200VDCW, MIL type (C20)M39014/01-1379

1A1C21 Same as IAIC19 7-1 '"(C21)

1A1C22 Same as IA1Cll 7-1

1A1CR1 SEMICONDUCTOR, DIODE; MIL type 7-1thru 1N4148-1 (CRl,

1A1CR2 CR2)

1AICR3 SEMICONDUCTOR, DIODE; MIL type 7-11N4150-1 (CR3)

7-8

Parts List EE730-DS-OMI -0l0/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Fig.Ref No.Desig Notes Name And Descrtption (Item)

• lA1CR4 SEMICONDUCTOR, DIODE; MIL type 7-1thru lN647-l (CR4-

lA1CR7 CR7)

.. lA1CR8 Same as 1AlCR3 7-1thru (CR8-

lAICRll CRll)

lA1CR12 SEMICONDUCTOR, DIODE, ZENER; 7-1MIL type lN46l7 (CR12)

lAlCR13 Same as lAlCRl 7-1(CR13)

1AICR14 Not Used

lAlCR15 Same as lA1CRl 7-1(CR15)

lAlRl Not usedthru.. lA1RlO

lAlRll RESISTOR, FIXED, COMPOSITION; 7-11 Megohm, ~ 10%, 1/4w, MIL type (Rll)RCR07Gl05KM

lAlR12 RESISTOR, FIXED, COMPOSITION; 7-1470K ohms, ~ 10%, 1/4w, MIL type (R12)RCR07G474KM

lAlR13 RESISTOR, FIXED, COMPOSITION; 7-147K ohms, ~ 10%, 1/4w, MIL type (RI3)RCR07G472KM

7-9

EE730-DS-OMI -010/4805-PDR-27S Parts List

Table 7-1. Maintenance Parts List - Continued'It'

Fig.Ref No.Desig Notes Name And Description (Item)

"

1A1R14 RESISTOR, FIXED, COMPOSITION; 7-14.7K ohms, + 10%, 1/4w, MIL type (R14)RCR07G472KM

1AIR15 RESISTOR, FIXED, COMPOSITION; 7-110Kohms, ~ 10%, 1/4w, MIL type (R15)RCR07GI03KM

1A1R16 RESISTOR, FIXED, COMPOSITION; 7-1820 ohms, + 10%, 1/4w, MIL type (R16)RCR07G82iKM

lAIR17 RESISTOR, FIXED, COMPOSITION; 7-1thru lK ohms, .:!: 10%, 1/4w, MIL type (R17-

1AlR18 RCR07G102KM R18)

lAlR19 RESISTOR, FIXED, COMPOSITION; 7-12.7K ohms, .:!: 5%, 1/4w, MIL type (R19)RCR07G272JM

1A1R20 RESISTOR, FIXED, COMPOSITION; 7-1'"2Kohms, ~ 5%, 1/4w, MIL type (R20)

RCR07G202JM

lAlR21 RESISTOR, FIXED, COMPOSITION; 7-14.3K ohms, .:!: 5%, 1/4w, MIL type (R21)RCR07G432JM

lA1R22 1 RESISTOR,VARIABLE,COMPOSITION; 7-12Kohms, .:!: 10%, 1/4w, MIL type (R22)RJ24CX202

lAIR23 Same as lAIR19 7-1(R23)

7-10

Parts List EE7 30-DS~OMI -010/48 05-PDR-27S

Table 7-1. Maintenance Parts List - Continued

Fig.Ref No.Desig~ Notes Name And Description Item)

..lA1R24 Same as 1A1R15 7-1thru (R24,

lAlR25 R25)•

'lA1R26 RESISTOR, FIXED, COMPOSITION; 7~llOOKohms, _:i:: 10%, 1/4w, MIL type (R26)RCR07Gl04KM

lA1R27 RESISTOR, FIXED COMPOSITION; 7-1thru 22 Megohms, + 10%, 1/4w, MIL type (R27-

lA1R29 RCR07G226KM R29)

1A1R30 RESISTOR, FIXED, COMPOSITION; 7-19, 53K ohms _:i:: 1%, 1/8w, MIL type (R30)RNC55H953lFM

lA1R3 1 RESISTOR, FIXED, COMPOSITION; 7-175K ohms, .:!:: 1%, 1/8w, MIL type (R3l)RNC55H7502FM

.. lAlR32 1 RESISTOR, VARIABLE, COMPOSITION; 7-150K ohms, + 10%, 1/2w, MIL type (R32)RJ24CX503

lAlR33 1 Same as lAIR31 7-1(R33)

1A1R34 Same as lAlR15 7-1thru (R34,

lA1R35 R35)

1A1R36 Same as lA1R13 7-1(R36)

lA1R37 Same as 1A1R26 7-1(R37)

.- 7-11

EE730-DS-OMI -01 OJ 4805-PDR-27S Parts List

Table 7-1. Maintenance Parts Lll5t - Continued-~

Fig.Ref No.Desig Notes Name And Description (Item)

{"

1A1Tl 1 TRANSFORMER, SATURATING 7-1OSCILLATOR; Encapsulated per (T1) •MIL-T-27 Grade II, mfr. 06442,part no. C21435 ~

1A1U1 1 SEMICONDUCTOR DEVICE, 7-1INTEGRATED CIRCUIT; MIL type (Ul)LMI08H

1A1Q1 1 SEMICONDUCTORDEVICE, TRAN- 7-1SISTOR; MIL type 2N3251A (Q1)

1A1Q2 1 SEMICONDUCTORDEVICE, TRAN- 7-1SISTOR; MIL type 2N3823 (Q2)

lAlQ3 1 SEMICONDUCTORDEVICE, TRAN- 7-1thru SISTOR; MIL type 2N916 (Q3,Q4)

1AIQ4

lAIQ5 1 SEMICONDUCTOR DEVICE, TRAN- 7-1thru SISTOR; MIL type 2N2484 (Q5, Q6)

lAIQ6.•.

lAIQ7 SEMICONDUCTORDEVICE, TRAN- 7-1SISTOR; MIL type 2N2907A (Q7)

9

1AIQ8 Same as lAlQ5 7-1(Q8)

lA1Q9 Same as 1A1Q7 7-1(Q9)

lAlQ10 Same as 1A1Q5 7-1(Q10)

7-12

Parts List EE730-DS-OMI-OIO/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued-RefDesig

•

Notes Name And Description

Fig.No.Item)

1-1

2A1MP20

2A2A1

2A2MP30

2A2MP31

2A2MP32

2A2MP33

2A2MP34

2A3A1

2A3A1R11

2A3MP45

2A3MP46

RADlACMETER PROBE DT-613/PDR-27S

6-2HOUSING, HIGH RANGE PROBE; mfr.06442, part no. B21415

COVER, LATCH ASSEMBLY; mfr. 6-206442, part no. A21556

HOUSING, LOW RANGE PROBE, mfr. 6-206442, part no. B21399

NUT, RETAINER; mfr. 06442, part no. 6-2C21410

GUARD, WINDOW; mfr. 06442, part 6-2no. A21401

"0" RING, neoprene; MIL type 6-2MS9021-020

CLAMP; mfr. 06442, part no. A21458

ASSEMBLY TUBE HOLDER; mfr.06442, part no. A21439

RESISTOR, FIXED, COMPOSITION;1 Megohm + 10%, 1/4w, MIL typeRCR07GI05KM

NUT, RETAINER; mfr. 06442, partno. B21402

WASHER, END CAP; mfr. 06442,part no. A21409

6-2

6-2

6-2(Rll)

6-2

6-2

7-13

EE730-DS-OMI -010/4805-PDR-27S

Table 7-1. Maintenance Parts List - ContiJ1u.ed

.Parts Lil:!t .,4.

RefDesig Notes Name And Description

2A3MP48

2A3MP47 END CAP; mfr 06442, part no. A21404

2A3MP49

2A3MP50

2A3MP51

2A3MP52

2A3MP53

2A3W1

2A3W2

2V1

7-14

2

"0" RING, NEOPRENE; MIL typeMS9021-022

CAP, ELECTRICAL; mfr. 83330,part no. 1454

NUT, RETAINER; mfr. 06442, partno. B21413

WASHER, FLAT; MIL type MS15795-709

END CAP; mfr. 06442, part no.B21412

"0" RING, NEOPRENE; MIL typeMS9021-012

CABLE, RETRACTABLE; mfr. 06442,part no. B21443

CABLE, JUMPER; mfr. 06442, partno. B21442

TUBE, G-M, end window, low range,MIL type JAN5979

Fig.'No,Item) ~.,;r1.~:-'"\

6-2

6-2 .

6-2

6-2

6-2

6-2

6-2

6-2(V1)

FederalSupply

• Code Manufacturer Address

06442 Nuclear Research Corporation 2 Richwood Place_~ Denville, N. J. 07834

08806 General Electric Company Nela ParkMiniature Lamp Division Cleveland, Ohio

44112

71785 TRW Cinch Division 1501 Morse AvenueElk Grove, Ill.60007

•

Parts List EE730-DS-QMI -OI0/4805-PDR-27S

Table 7-1. Maintenance Parts List - Continued

cFig.

Ref No.Desig Notes Name And Description Item)

'.2V2_; 2 TUBE, G-M, high range, MIL type 6-2; JAN5980 (V2)

NOTES:

1. If component is changed, pre-alignment should be performed.Refer to par 6-4, c.

2. If component is changed, asource calibration should beperformed. Refer to par6-4, d.

Table 7-2. List of Manufacturers

7-15

EE730-DS-OMI -010/4805-PDR-27S

FederalSupplyCode

81073

83330

97539

7-16

Table 7-2. List of Manufacturers - Continued

Parts List

Manufacturer Address

Grayhill, Incorporated

H. H. Smith, Inc.

Automatic and PrecisionManufacturers, Inc.

561 Hillgrove AvenueLa Grange, Ill. '."60525

812 Sneiker AvenueNew York, N. Y.11207

44 Honeck StreetEnglewood, N. J.07631

Parts List EE730-DS-OMI -010/4805-PDR-27S

••

•

Figure 7-1. Parts Location, Printed Circuit Board Assembly lAl

7-17

EE730-DS-OMI-010/4805-PDR-27S Parts List

IMPI2IMPI3IMPI4IMP4

(+l UPBT2

Figure 7-20 Parts Location

7-18 "u.s. GOVERNMENT PRINTING OFFICE: 1981-103-007/7095

EE 730-00 -OMI -010/4805 -l'DR-27S

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NAVAL ELECTRONIC SYSTEMS COMMANDTECHNICAL PUBUCA TlONS BRANCHDEPARTMENT OF THE NAVYWASHINGTON, D. C. 20360

Fold

EE 73(,- DS-OMI -lJlO/ 4805- FDR-27S

.".

NAVELEX NO. _ USERA("nVITY COMM~NTSHftT VoJ.No. _

[Fohl on ":01100 lines on reverse :si<k.staple in corner aml send to:

Naval Electronic Systems CommandTechnical Publications BranchDeportment of tlte N.'YWlsltington, D.C. 203bO

PROBLEMAREA:,.

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