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Model 5 Geiger Counter

Technical Manual

Section 9

Ludlum Measurements, Inc.

Page 9-3

May 2014

Reference

Description

Part Number

R27

68.1K, 1/4W, 1%

12-7881

R28

100K, 1/4W, 1%

12-7834

R29

1K,

1/4W,

12-7832

R30

1M,

1/4W,

12-7844

R31

475K, 1/4W, 1%

12-7859

R32

100K, 1/4W, 1%

12-7834

R37

100K, 1/4W, 1%

12-7834

R38

90.9K, 1/4W, 1%

12-7224

R39-R42

100K, 1/4W, 1%

12-7834

R43

4.75K, 1/4W, 1%

12-7858

R44

2K,

1/4W,

12-7926

R45

200K, 1/4W, 1%

12-7992

R46

14.7K, 1/4W, 1%

12-7222

R47

1M,

1/4W,

12-7844

R48

100K, 1/4W, 1%

12-7834

R49

10K,

1/4W,

12-7839

R50-R51 1M,

1/4W,

12-7844

640456-4 - MTA100x4

13-8088

640456-6 - MTA100x6

13-8095 (OPTIONAL)

640456-2 - MTA100x2

13-8073

640456-5 - MTA100x5

13-8057

µH

21-9808

BOARD

Completely Assembled

HV Power Supply Board

5464-249

LND

71412

01-5306

LND

71210

01-5295

10µF,

25V

04-5655

100PF,

3KV

04-5735

0.01µF, 3KV, 2%

04-5762

100PF,

3KV

04-5735

C7-C12

0.01µF, 500V

04-5696

C13

68µF,

10V

04-5654

C14

0.1µF,

50V

04-5663

LT1304CS8

06-6394

CONNECTORS

INDUCTORS

HV Power Supply
Board, Drawing
464 × 249

DETECTORS

CAPACITORS

INTEGRATED
CIRCUITS

Содержание 5

Страница 1: ...LUDLUM MODEL 5 GEIGER COUNTER May 2014 Serial Number 236626 and Succeeding Serial Numbers ...

Страница 2: ...LUDLUM MODEL 5 GEIGER COUNTER May 2014 Serial Number 236626 and Succeeding Serial Numbers ...

Страница 3: ...anty of merchantability or fitness which extend beyond the description of the face there of If the product does not perform as warranted herein purchaser s sole remedy shall be repair or replacement at the option of Ludlum Measurements In no event will Ludlum Measurements be liable for damages lost revenue lost wages or any other incidental or consequential damages arising from the purchase use or...

Страница 4: ...rols and Functions 4 Safety Considerations 5 Environmental Conditions for Normal Use 5 1 Warning Markings and Symbols 5 1 Cleaning and Maintenance Precautions 5 2 Maintenance 6 Recalibration 6 1 Batteries 6 1 Troubleshooting 7 Troubleshooting Electronics which utilize GM Detectors 7 1 Troubleshooting GM Detectors 7 3 Recycling 8 Parts List 9 Model 5 Geiger Counter 9 1 Main Board Drawing 464 272 9 ...

Страница 5: ...es a regulated high voltage power supply overload circuitry unimorph speaker with audio ON OFF capability fast slow meter response meter reset button battery check button and a six position switch for selecting range multiples of 0 1 1 10 100 and 1000 Each range multiplier has its own calibration potentiometer located under a protective cover on the front panel The unit body and meter housing are ...

Страница 6: ...nstrument must be accompanied by an Instrument Return Form which can be downloaded from the Ludlum website at www ludlums com Find the form by clicking the Support tab and selecting Repair and Calibration from the drop down menu Then choose the appropriate Repair and Calibration division where you will find a link to the form Battery Installation Ensure the Model 5 range selector switch is in the ...

Страница 7: ...ded that the AUD ON OFF switch be kept in the OFF position when not needed in order to preserve battery life Warning A low battery condition results in a steady audio tone regardless of the position of the AUD ON OFF switch Check the meter reset function by depressing the RES pushbutton switch and ensuring the meter needle drops to 0 Once this procedure has been completed the instrument is ready f...

Страница 8: ...he instrument and the detector s between calibrations an instrument operational check including battery test and instrument should be performed at least daily or prior to use whichever is less frequent A reference reading or readings with a check source should be obtained with the detector s in a constant and reproducible manner at the time of calibration or at the time the instrument is received ...

Страница 9: ...w range detector 425 75 mV for the high range detector Energy Response within 15 of true value from 60 keV 3 MeV Saturation in excess of 1000 R hr Meter 6 4 cm 2 5 inch arc 1 mA pivot and jewel suspension Meter Dial 0 2 mR hr BAT TEST others available Range typically 0 2000 mR hr Linearity reading within 10 of true value Calibration Controls individual potentiometers for each range accessible from...

Страница 10: ...batteries housed in a sealed externally accessible compartment Battery Life typically greater than 2000 hours battery condition may be checked on the meter face Battery Dependence instrument calibration change less than 3 within battery check limits on the meter Temperature Range 20 to 50 C 4 to 122 F Size 24 1 x 8 9 x 21 6 cm 9 5 x 3 5 x 8 5 inch H x W x L including instrument handle Weight 2 kg ...

Страница 11: ...t Recessed potentiometers located under the calibration cover on the right side of the front panel These adjustment controls allow individual calibration for each range multiplier Battery Compartment Sealed compartment to house two D cell batteries RES Pushbutton When depressed this switch provides a rapid means of driving the meter needle to zero AUD ON OFF Toggle Switch In the ON position operat...

Страница 12: ...ides 90 of full scale meter deflection in four seconds In the slow S position 90 of full scale meter deflection takes 22 seconds In the F position there is fast response and large meter deviation The S position should be used for slow response and damped meter deviation Over range adjustment Internal HV Board R3 This potentiometer is utilized in the calibration of the instrument only ...

Страница 13: ... Caution The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements Inc The Model 5 Geiger Counter is marked with the following symbols CAUTION per ISO 3864 No B 3 1 designates hazardous live voltage and risk of electric shock During normal use internal components are hazardou...

Страница 14: ...al waste when discarding each material must be separated The symbol is placed on the battery compartment lid See section 8 Recycling for further information The CE mark is used to identify this instrument as being acceptable for use within the European Union Cleaning and Maintenance Precautions The Model 5 may be cleaned externally with a damp cloth using only water as the wetting agent Do not imm...

Страница 15: ...after maintenance or adjustments have been performed on the instrument Recalibration is not normally required following instrument cleaning or battery replacement Note Ludlum Measurements Inc recommends recalibration at intervals no greater than one year Check the appropriate regulations to determine required recalibration intervals Ludlum Measurements offers a full service repair and calibration ...

Страница 16: ...panner wrench to unscrew the battery contact insulators exposing the internal contacts and battery springs Removal of the handle will facilitate access to these contacts Note Never store the instrument over 30 days without removing the batteries Although this instrument will operate at very high ambient temperatures battery seal failure may occur at temperatures as low as 38 C 100 F ...

Страница 17: ...Note that the first troubleshooting tip is for determining whether the problem is with the electronics or with the detector A Ludlum Model 500 Pulser is invaluable at this point because of its ability to simultaneously check high voltage input sensitivity or threshold and the electronics for proper counting We hope these tips will prove to be helpful As always please call if you encounter difficul...

Страница 18: ...heck the meter zero Turn the power OFF The meter should come to rest on 0 1 Check the HV and if possible the input threshold for proper setting 2 Ensure that the instrument s can is properly attached When attached properly the speaker will be located on the left side of the instrument If the can is on backwards interference between the speaker and the input preamplifier may cause noise 1 Substitut...

Страница 19: ...it board and the speaker Plug in the 2 pin connector if necessary Troubleshooting GM Detectors 1 If the tube has a thin mica window check for window breakage If damage is evident the tube must be replaced 2 Check the HV For most GM tubes the voltage is normally 900 Vdc or 460 550 Vdc for peanut tubes Ludlum Model 133 series 3 Wires to the tube may be broken or the crimped connector could have a lo...

Страница 20: ...but simply desires to inform its consumers of the range of recyclable materials present in its products so that the user will have flexibility in following all local and federal laws The following types of recyclable materials are present in Ludlum Measurements Inc electronics products and should be recycled separately The list is not all inclusive nor does it suggest that all materials are presen...

Страница 21: ...6 C7 0 022µF 50V 04 5667 C9 10µF 10V DT 04 5766 C10 100pF 100V 04 5661 C11 C13 68µF 10V 04 5654 C14 470pF 100V 04 5668 C15 100pF 100V 04 5661 C16 10µF 10V DT 04 5766 C17 47µF 10V 04 5666 C18 C19 470pF 100V 04 5668 C30 10µF 10V DT 04 5766 C31 1µF 16V 04 5701 Q1 MMBT3904LT1 05 5841 Q2 MMBT4403LT1 05 5842 Q3 Q6 2N7002L 05 5840 Q7 MMBT3904LT1 05 5841 VR2 TPS76038 05 5912 U1 U3 MAX4542EKA T 06 6638 U4 ...

Страница 22: ...R4 CMPD2005S 07 6468 SW1 CENTRAL 2P6P 08 6761 SW2 TP11LTCQE 7464 186 SW3 SW4 7101SDCQE 08 6781 SW5 TP11LTCQE 7464 186 R12 50K 60W503 1K 09 6838 R33 1M 64W105 100 09 6814 R34 1M 64W105 10 09 6814 R35 1M 64W105 1 09 6814 R36 500K 64W504 0 1 09 6850 R1 R5 200K 1 4W 1 12 7992 R6 R7 10K 1 4W 1 12 7839 R8 2K 1 4W 1 12 7926 R9 R11 10K 1 4W 1 12 7839 R13 R17 10K 1 4W 1 12 7839 R18 100K 1 4W 1 12 7834 R19 ...

Страница 23: ...W 1 12 7222 R47 1M 1 4W 1 12 7844 R48 100K 1 4W 1 12 7834 R49 10K 1 4W 1 12 7839 R50 R51 1M 1 4W 1 12 7844 P1 640456 4 MTA100x4 13 8088 P2 640456 6 MTA100x6 13 8095 OPTIONAL P3 640456 2 MTA100x2 13 8073 P4 640456 5 MTA100x5 13 8057 L1 22 µH 21 9808 BOARD Completely Assembled HV Power Supply Board 5464 249 V1 LND 71412 01 5306 V2 LND 71210 01 5295 C1 10µF 25V 04 5655 C2 100PF 3KV 04 5735 C3 0 01µF ...

Страница 24: ...7 6411 R3 25K 8026EKX 253 OJ ADJ 09 6832 R8 NOT USED N A R1 R2 1M 1 4W 1 12 7844 R4 1M 1 4W 1 12 7844 R5 4 75K 1 4W 1 12 7858 R6 500M 3KV 2 12 7031 R7 4 75K 1 4W 1 12 7858 R9 2 2M 1 8W 5 12 7002 R10 10M 1 4W 5 12 7955 R11 10K 1 4W 1 12 7839 R12 150K 1 4W 1 12 7833 P6 640456 5 MTA100 5 13 8057 T1 31032R 21 9925 DIODES POTENTIOMETER RESISTORS CONNECTOR TRANSFORMER ...

Страница 25: ...1 May 2014 Drawings MAIN CIRCUIT BOARD Drawing 464 272 3 sheets MAIN CIRCUIT BOARD LAYOUT Drawing 464 273 2 sheets HV POWER SUPPLY BOARD Drawing 464 249 HV POWER SUPPLY BOARD LAYOUT Drawing 464 250 2 sheets WIRING DIAGRAM Drawing 464 351 ENERGY RESPONSE for LMI Model 5 Section 10 ...

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Страница 35: ...0 1 1 10 10 100 1000 10000 Normalized to Cs 137 Gamma Energy keV Energy Response for LMI Model 5 Low Range High Range Cs 137 ...

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