LUDLUM 12-4 User Manual

Model 12-4 Technical Manual
Ludlum Measurements, Inc. May 2016
Technical Theory of Operation 8
Main Board (Drawing 464 × 275, 3 sheets) 8-1
Input 8-1
Amplifier 8-1
Discriminator 8-1
Audio 8-1
Scale Ranging 8-2
Digital Analog Converter 8-2
Ratemeter Drive Circuit 8-2
HV Meter Drive 8-2
Battery Test 8-2
HV Power Supply Board (Drawing 464 × 243) 8-3
Switching Convertor 8-3
Feedback 8-3
Voltage Control 8-3
Filtering 8-3
Recycling 9
Parts List 10
Model 12-4 Survey Meter 10-1
Main Board, Drawing 464 × 275 10-1
HV Power Supply Board, Drawing 464 × 243 10-4
Wiring Diagram, Drawing 464 × 309 10-5
Model 42-31H Neutron Detector 10-5
Drawings and Diagrams 11

LUDLUM 12-4 Specifications

General

Brand	LUDLUM
Model	12-4
Category	Measuring Instruments
Language	English