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LUDLUM MODEL 19A
Micro R Meter
May 2017
Serial No. 144020 and Succeeding
Serial Numbers

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Summary of Contents for LUDLUM 19A

  • Page 1 LUDLUM MODEL 19A Micro R Meter May 2017 Serial No. 144020 and Succeeding Serial Numbers...
  • Page 3 LUDLUM MODEL 19A Micro R Meter May 2017 Serial No. 144020 and Succeeding Serial Numbers...
  • Page 5: Statement Of Warranty

    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 7: Table Of Contents

    Model 19A Micro R Meter TABLE OF CONTENTS 1. GENERAL ............................1 2. SPECIFICATIONS ..........................1 3. DESCRIPTION OF CONTROLS AND FUNCTIONS ..............2 4. OPERATING PROCEDURES ......................2 5. CALIBRATION ..........................3 6. MAINTENANCE ..........................4 PARTS LIST ............................5...
  • Page 8 Model 19A Micro R Meter...
  • Page 9: General

    Model 19A Micro R Meter 1. GENERAL The Ludlum Model 19A Micro R Meter is a aluminum. Other operating features of the portable survey instrument having instrument include unimorph speaker additional feature of an audio and visual alarm. mounted to the instrument can with an audio...
  • Page 10: Description Of Controls And Functions

    The higher the rate is, 4. OPERATING PROCEDURES The Model 19A is a simple instrument to  Check the instrument for the proper operate. All controls are located on the front panel along with the battery compartment.
  • Page 11: Calibration

    C57-R27 junction.  Replace instrument can.  Set the pulse height at -80 mV.  Take the Model 19A to a certified  Calibrate the scales as shown in Table calibration range. Place the instrument in a 100R/hr (1 µSv/h) (exposure rate) 1.
  • Page 12: Maintenance

    Model 19A Micro R Meter  When the alarm circuit is energized, both SPAN control for the upper reading. the audio and visual indications should  Position meter pointer at the desired alarm occur. Depressing the ALARM RES set point with radiation source. Adjust the...
  • Page 13: Parts List

    Model 19A Micro R Meter PARTS LIST Ref. No. Description Part No. Model 19A Ratemeter UNIT Completely Assembled Model 48-2117 19A Micro R Meter Circuit Board, Drawing 363 X 440 BOARD Assembled Circuit Board 5363-602 CAPACITORS 0.0015F, 3KV, C 04-5518 0.0015F, 3KV, C...
  • Page 14 Model 19A Micro R Meter 2N3904 05-5755 2N3904 05-5755 Q145 MPS6534 05-5763 Q218 MPSW01 05-5778 Q224 MPS6534 05-5763 Q225 2N3904 05-5755 INTEGRATED CIRCUITS CA3096 06-6023 TLC372 06-6265 CD4098 06-6066 CA3096 06-6023 ICM7555 06-6136 TLC27M7IP 06-6248 MAX631 06-6249 U101 LM385Z-1.2 05-5808...
  • Page 15 Model 19A Micro R Meter 10-7016 100k 10-7023 470k 10-7026 2.7M 10-7029 10-7016 100k 10-7023 4.7k 10-7014 R128 100k 10-7023 R137 10-7016 R138 10-7028 R147 SAT (TYPICALLY 750k) R150 SAT (TYPICALLY 2.2k) R159 10-7016 R172 10-7020 R177 200 OHM 10-7006...
  • Page 16 Model 19A Micro R Meter Calibration Board, Drawing 367 x 48 BOARD Assembled Calibration Board 5367-064 RESISTORS R1-R2 100k TRIMMER 09-6823 500 OHM TRIMMER 09-6848 10-7016 100k TRIMMER 09-6823 100k 10-7023 MISCELLANEOUS CONN-640456-8 MTA100 13-8039 Wiring Diagram, Drawing 367 X 47...
  • Page 17 Model 19A Micro R Meter METER MVMNT 919492 1 mA 15-8030 M19A BATTERY BOX LID 9367-125 W/CE BATTERY CONTACT ASSY 2001-042 DEEP PORTABLE CAN ASSY 4363-615 M19A CASTING 9367-055 M19A MAIN HARNESS 8367-065 PORTABLE KNOB 08-6613 BATTERY LID W/LATCH 9367-032...
  • Page 19: Drawings And Diagrams

    Model 19A Micro R Meter DRAWINGS AND DIAGRAMS Front of Manual: Model 19A Micro Sieverts Front Panel, Drawing 367 x 167 Back of Manual: *Main Board, Drawing 363 x 440 *Main Board Component Layout, Drawing 363 x 441 Calibration Board, Drawing 367 x 48...

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