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Model 3-IS & 3-IS-1
Technical Manual
Ludlum Measurements, Inc.
October, 2010
Troubleshooting
7
Troubleshooting Electronics which utilize a
G-M Detector or Scintillator
7-1
Troubleshooting G-M Detectors
7-3
Troubleshooting Scintillators
7-4
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-IS Survey Meter
10-1
Main Board, Drawing 464 × 355
10-1
Safety Board, Drawing 464 × 361
10-3
Wiring Diagram, Drawing 464 × 358
10-4
Drawings and Diagrams
11
Summary of Contents for 239605
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