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LUDLUM MODEL 3 User Manual

LUDLUM MODEL 3
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Model 3 Technical Manual
Ludlum Measurements, Inc. April 2016
Technical Theory of Operation 8
Low-Voltage Supply 8-1
High-Voltage Supply 8-1
Detector Input 8-1
Amplifier 8-1
Discriminator 8-2
Audio 8-2
Scale Ranging 8-2
Meter Drive 8-2
Meter Reset 8-2
Fast/Slow Time Constant 8-2
Recycling 9
Parts List 10
Model 3 Survey Meter 10-1
Main Board, Drawing 464 × 204 10-1
Wiring Diagram, Drawing 464 × 212 10-3
Drawings and Diagrams 11

Table of Contents

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LUDLUM MODEL 3 Specifications

General IconGeneral
Detector Compatibilityscintillation detectors
Power SourceTwo D-cell batteries
DisplayAnalog meter
AudioBuilt-in speaker
Operating Temperature-20°C to 50°C (-4°F to 122°F)
Energy RangeDepends on detector
Accuracy±10%

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