Ludlum Measurements 3-97 Manual
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Ludlum Measurements 3-97 Manual

Survey meter
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LUDLUM MODEL 3-97
SURVEY METER
June 2020
Serial No. 346285 and Succeeding
Serial Numbers

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Summary of Contents for Ludlum Measurements 3-97

  • Page 1 LUDLUM MODEL 3-97 SURVEY METER June 2020 Serial No. 346285 and Succeeding Serial Numbers...
  • Page 2 LUDLUM MODEL 3-97 SURVEY METER June 2020 Serial No. 346285 and Succeeding Serial Numbers...
  • Page 3 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.

  • Page 5: Table Of Contents

    M3-97 Survey Meter TABLE OF CONTENTS 1. GENERAL ............................1 2. SPECIFICATIONS ......................... 1 3. DESCRIPTION OF CONTROLS AND FUNCTIONS.............. 2 4. OPERATING PROCEDURES ...................... 3 5. CALIBRATION ..........................4 5.1 Detector Operating Point ....................... 4 5.1.1 Internal Detector Calibration ..................... 4 5.1.2 External Detector Calibration ....................

  • Page 6: General

    June 2020 1. GENERAL The Model 3-97 is a portable survey instrument with four linear ranges. Typical range values are 0- 3000 R/hr for the internal detector and 0-200 mR/hr for the external detector. The instrument features an internal scintillator that detects low-level gamma radiation, and also features the capability of utilizing an external probe by a switch on the front panel labeled INT/EXT.

  • Page 7: Description Of Controls And Functions

    Model 3-97 Survey Meter June 2020 WEIGHT: 1.4 kg (3 lb); 2 kg (4.4 lb) with external detector and batteries FINISH: drawn-and-cast aluminum, with computer-beige polyurethane enamel and silk- screened nomenclature 3. DESCRIPTION OF CONTROLS AND FUNCTIONS Range Multiplier Selector Switch: a six- 22 seconds.

  • Page 8: Operating Procedures

    Model 3-97 Survey Meter June 2020 4. OPERATING PROCEDURES Note: To open the Battery Lid, twist the lid Note: To assure proper operation of the button counterclockwise a quarter-turn. instrument between calibrations, an instrument close, twist clockwise a quarter-turn. operational check should be performed prior to use.

  • Page 9: Calibration

    INT/EXT switch is set. Typically an external INT/EXT switch to the EXT position. GM type detector is used and the maximum operating voltage is 1000 Vdc; therefore, the  With the Model 3-97 switch to the internal detector operating voltage must be kept lowest calibrated...

  • Page 10: Cpm And Mr/Hr Meterface

    Model 3-97 Survey Meter June 2020 5.1.3 CPM and mR/hr Meterface  For the combination CPM and mR/hr meter face, calibrate the external detector with a calibrated certified range. Record the field versus CPM meter reading for the internal detector at various points on the calibration range.

  • Page 11: Theory Of Operation

    Model 3-97 Survey Meter June 2020 7. THEORY OF OPERATION 7.1 Input Positive pulses from pin 7 of U4 are The external detector pulses are coupled coupled to the discriminator. from the detector through C3 to emitter follower Q5. R10 and R20 provide bias.

  • Page 12: Meter Drive

    Model 3-97 Survey Meter June 2020 7.7 Meter Drive 7.11 Low Voltage Reference The meter is driven by the emitter of Q3, U7 provides a 1.22 V precision reference coupled voltage follower for HV supply and discriminator reference. conjunction with pin 1 of U3. For the battery test, the voltage follower is 7.12 High Voltage Supply...

  • Page 13: Parts List

    Model 3-97 Survey Meter June 2020 PARTS LIST Ref. No. Description Part No. Ref. No. Description Part No. TLC372IP 06-6265 Model 3-97 Survey Meter CD4098BE 06-6066 LM385Z-1.2 05-5808 UNIT Completely Assembled Model MAX631 06-6249 3-97 Survey Meter 48-1410 CMXT3904TRLF 05-5888...

  • Page 14: Calibration Board, Drawing 363 X 528

    Model 3-97 Survey Meter June 2020 CONN-640456-5 Ref. No. Description Part No. MTA100 13-8057 100k, 250mW, 5% 10-7023 CONN-640456-4 10M, 250mW, 5% 10-7031 MTA100 13-8088 Ref. No. Description Part No. THERMISTORS Chassis Wiring Diagram, Drawing 363 X 582 RT15 150 Ohm, 333mW, 2%...
  • Page 15 Model 3-97 Survey Meter June 2020 Ref. No. Description Part No. PROBE KNOB- MS 91528 08-6606 PORT BEZEL GLASS W/O SCREWS 4363-352 METER MOVEMENT (1mA) 15-8030 PORTABLE METER FACE 7363-136 HARNESS-PORT CAN WIRES 8363-462 PORTABLE BATTERLY LID WITH STAINLESS CONTACT 2009-036 PORT.

  • Page 16: Drawings And Diagrams

    Model 3-97 Survey Meter June 2020 DRAWINGS AND DIAGRAMS Energy Response Curve for Model 3-97 (Internal Detector) Main Circuit Board, Drawing 464 x 633 Main Circuit Board Component Layout, Drawing 464 x 636 (2 sheets) Calibration Board, Drawing 363 x 528...

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